CN113078853B - Permanent magnet synchronous motor dragging device improved by induction motor - Google Patents
Permanent magnet synchronous motor dragging device improved by induction motor Download PDFInfo
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- CN113078853B CN113078853B CN202110525166.5A CN202110525166A CN113078853B CN 113078853 B CN113078853 B CN 113078853B CN 202110525166 A CN202110525166 A CN 202110525166A CN 113078853 B CN113078853 B CN 113078853B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/08—Arrangements for controlling the speed or torque of a single motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/05—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation specially adapted for damping motor oscillations, e.g. for reducing hunting
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/13—Observer control, e.g. using Luenberger observers or Kalman filters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation
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Abstract
The invention relates to a dragging device for reforming a permanent magnet synchronous motor by an induction motor, which comprises: the variable frequency driver is used for adjusting the frequency of the induction motor and driving the permanent magnet synchronous motor; the wire device is provided with an adjusting valve and N wires, the adjusting valve is arranged outside the wire device, the adjusting valve is rotated clockwise to enable the wires connected with the rotor to be thicker, and the adjusting valve is rotated anticlockwise to enable the wires connected with the rotor to be thinner; the permanent magnet synchronous motor is internally provided with a rotor and is used for adjusting the resonance frequency generated by the permanent magnet synchronous motor through power adjustment; the voltage detector is used for detecting the voltage of the variable-frequency driver; the capacitance detector is used for detecting the capacitance of the permanent magnet synchronous motor; the control unit is used for controlling the frequency adjustment process when the induction motor is reconstructed; therefore, the carrier frequency generated by the variable-frequency driver can be far away from the resonant frequency generated by the permanent magnet synchronous motor, the dependence of the whole system on devices is reduced, and the stability of the whole system is obviously improved.
Description
Technical Field
The invention relates to the technical field of pumping unit driving, in particular to a dragging device for a permanent magnet synchronous motor improved by an induction motor.
Background
In the production operation of oil fields, the traditional asynchronous motor and the driving motors of various types of oil pumping devices have the defects of complex mechanical structure, large motor size, low material utilization rate, low overall system efficiency and the like. Especially, the well conditions of different oil wells in different working intervals are often inconsistent, the traditional driving mode cannot adjust the high-precision rotating speed of the driving motor, and only can change the transmission ratio and adjust the speed by continuously replacing belt pulleys with different sizes, so that the mode greatly increases the manpower labor, influences the stability of oil field oil extraction, and is not beneficial to the requirements of long-time and automatic oil extraction. Meanwhile, most of the existing permanent magnet synchronous motor speed regulation systems use a variable-voltage variable-frequency speed regulation strategy, although the strategy has the advantages of low cost, simplicity in use and the like, the control strategy can reduce the torque when the motor is at low speed due to the unique working characteristics of the beam pumping unit, and compensation is difficult to realize under different well conditions.
The permanent magnet synchronous motor has the advantages of simple structure, reliable operation, small volume, low loss, high efficiency and the like, and is widely applied to the fields of electric automobiles, numerical control machines and electronics and electricity. In practical application of the permanent magnet synchronous motor, relevant parameters of the permanent magnet synchronous motor need to be identified in advance to configure an optimal control scheme of the permanent magnet synchronous motor.
At present, some induction motors are transformed into permanent magnet synchronous motor dragging devices, but the carrier frequency generated by a variable frequency driver is far away from the resonant frequency generated by the permanent magnet synchronous motor to improve the stability of the whole system.
Disclosure of Invention
Therefore, the invention provides a dragging device of an induction motor transformed permanent magnet synchronous motor, which can effectively solve the technical problem that the stability of the whole system is low because the carrier frequency generated by a time-varying frequency driver of the dragging device of the induction motor transformed permanent magnet synchronous motor is the same as or similar to the resonance frequency generated by the permanent magnet synchronous motor in the prior art.
In order to achieve the above object, the present invention provides a dragging device for transforming an induction motor into a permanent magnet synchronous motor, comprising:
the variable frequency driver is used for adjusting the frequency of the induction motor and driving the permanent magnet synchronous motor;
the wire device is connected with the variable frequency driver and is provided with an adjusting valve and N wires, N is more than or equal to 6, the wires are arranged in the wire device, the N wires are made of the same material and have different thicknesses, the adjusting valve is arranged outside the wire device, the adjusting valve is rotated clockwise to thicken the wires connected with the rotor, and the adjusting valve is rotated anticlockwise to thin the wires connected with the rotor;
the permanent magnet synchronous motor is connected with the wire device, and a rotor is arranged in the permanent magnet synchronous motor and used for adjusting the resonance frequency generated by the permanent magnet synchronous motor through power adjustment;
the voltage detector is connected with the variable-frequency driver and used for detecting the voltage of the variable-frequency driver;
the capacitance detector is connected with the permanent magnet synchronous motor and used for detecting the capacitance of the permanent magnet synchronous motor;
the intensity detection sensor is connected with the permanent magnet synchronous motor and used for detecting the intensity of noise generated by the rotor;
the control unit is connected with the variable frequency driver, the lead device, the permanent magnet synchronous motor, the voltage detector, the capacitance detector and the strength detection sensor and is used for controlling the frequency adjustment process when the induction motor is transformed;
when the induction motor is modified, the control unit compares a carrier frequency R generated by the variable frequency driver with a resonance frequency P generated by the permanent magnet synchronous motor to determine whether the rotor power needs to be adjusted, further determines whether the rotor power needs to be adjusted through a first frequency difference Da, a second frequency difference Db and a preset frequency difference D0, controls the adjusting valve to rotate to enable the rotor to be connected with wires with different thicknesses in series to adjust the rotor power if the rotor power needs to be adjusted, compares an actual voltage U of the variable frequency driver with a preset voltage to determine the carrier frequency R, and compares an actual capacitor Q of the permanent magnet synchronous motor with the preset capacitor to determine the resonance frequency P;
the actual voltage U is measured by a voltage detector, and the actual capacitance Q is measured by a capacitance detector.
Further, when the rotor power needs to be adjusted, if Da is less than D1, the control unit controls the adjusting valve to rotate j screens clockwise, so that a lead connected with the rotor becomes thick, the resistance becomes small, the rotor power becomes large, and j = INT ([ (1/2) × N ]);
if D1 is not less than Da and not more than D2, the control unit controls the regulating valve to rotate j screens clockwise, so that a lead connected with the rotor becomes thick, the resistance becomes small, the power of the rotor becomes large, and j = INT ([ (1/3). times.N ]);
if D2 is not less than Da and not more than D3, the control unit controls the regulating valve to rotate j screens clockwise, so that a lead connected with the rotor becomes thick, the resistance becomes small, the power of the rotor becomes large, and j = INT ([ (1/4). times.N ]);
if Da is larger than or equal to D3, the control unit controls the regulating valve to rotate j screens clockwise, so that a lead connected with the rotor becomes thick, the resistance becomes small, the power of the rotor becomes large, and j = INT ([ (1/5). times.N ]);
if Db is less than D1, the control unit controls the regulating valve to rotate j screens anticlockwise so as to thin a wire connected with the rotor, increase the resistance and further reduce the power of the rotor, and j = INT ([ (1/3). times.N ]);
if Db is more than or equal to D1 and less than or equal to D2, the control unit controls the regulating valve to rotate j screens anticlockwise so as to thin a conducting wire connected with the rotor, increase the resistance and further reduce the power of the rotor, and j = INT ([ (1/4). times.N ]);
if Db is more than or equal to D2 and less than or equal to D3, the control unit controls the regulating valve to rotate j screens anticlockwise so as to thin a conducting wire connected with the rotor, increase the resistance and further reduce the power of the rotor, and j = INT ([ (1/5). times.N ]);
if Db is larger than or equal to D3, the control unit controls the regulating valve to rotate j screens anticlockwise so as to thin a lead connected with the rotor, increase the resistance and further reduce the power of the rotor, and j = INT ([ (1/6). times.N ]);
where Di represents the diameter ith standard frequency difference, setting i =1,2, 3.
Further, when the induction motor is modified, the control unit acquires the carrier frequency generated by the variable frequency driver and sets the carrier frequency as R, when the setting is completed, the control unit acquires the resonance frequency generated by the permanent magnet synchronous motor and sets the resonance frequency as P, when the setting is completed, the control unit compares the carrier frequency R with the resonance frequency P to determine whether the rotor power needs to be adjusted, and when the control unit determines that the rotor power needs to be adjusted, the control unit controls the adjusting valve to rotate so that the rotor is connected with wires with different thicknesses in series;
if R is less than P, the control unit judges whether the power of the rotor needs to be adjusted or not by combining the noise intensity generated by the rotor;
if R = P, the control unit judges that the rotor power needs to be adjusted;
if R > P, the control unit determines that it is necessary to adjust the rotor power in combination with the first difference in frequency.
Further, when the control unit judges that whether the power of the rotor needs to be adjusted or not by combining the frequency difference value, the control unit calculates a first frequency difference value Da, when the calculation is completed, the control unit compares the first frequency difference value Da with a preset frequency difference value D0 to determine whether the power of the rotor needs to be adjusted or not, and when the control unit judges that the power of the rotor needs to be adjusted, the control unit controls the adjusting valve to rotate so that the rotor is connected with wires with different thicknesses in series;
if Da is less than or equal to D0, the control unit judges that the power of the rotor needs to be adjusted;
if Da > D0, the control unit determines that rotor power adjustment is not necessary.
Further, when the control unit determines whether the rotor power needs to be adjusted or not in combination with the frequency difference, the control unit calculates a first frequency difference Da, which is calculated as follows:
Da=R-P；
in the formula, R represents the carrier frequency generated by the variable frequency driver, and P represents the resonance frequency generated by the permanent magnet synchronous motor.
Further, when the control unit judges whether the power of the rotor needs to be adjusted or not by combining the noise intensity generated by the rotor, the control unit controls the noise intensity detection sensor to detect the noise intensity generated by the rotor and sets the detected noise intensity as W, and when the setting is finished, the control unit compares the noise intensity W with the preset noise intensity to determine a frequency difference value calculation parameter;
the control unit is provided with preset noise intensity and frequency difference value calculation parameters, wherein the preset noise intensity comprises a first preset noise intensity W1, a second preset noise intensity W2 and a third preset noise intensity W3, and W1 is more than W2 and less than W3; the frequency difference calculation parameters comprise a frequency difference first calculation parameter K1, a frequency difference second calculation parameter K2, a frequency difference third calculation parameter K3 and a frequency difference fourth calculation parameter K4, wherein the calculation parameters are not equal to each other and K1+ K2+ K3+ K4= 1;
if W is less than W1, the control unit determines that the frequency difference calculation parameter is K1;
if W1 is not less than W2, the control unit judges that the frequency difference calculation parameter is K2;
if W2 is not less than W3, the control unit judges that the frequency difference calculation parameter is K3;
if W is larger than or equal to W3, the control unit judges that the frequency difference calculation parameter is K4.
Further, when the control unit determines that the frequency difference value calculation parameter is Ki, the control unit calculates a second frequency difference value Db, sets Db = (P-R) × Ki, and sets i =1,2,3,4, when the calculation is completed, the control unit compares the second frequency difference value Db with a preset frequency difference value D0 to determine whether the rotor power needs to be adjusted, and when the control unit determines that the rotor power needs to be adjusted, the control unit controls the adjusting valve to rotate so that the rotor is connected in series with wires with different thicknesses;
if Db is less than or equal to D0, the control unit judges that the rotor power needs to be adjusted;
if Db > D0, the control unit determines that rotor power adjustment is not necessary.
Further, when the induction motor is modified, the voltage detector is controlled to detect the voltage of the variable frequency driver, the control unit sets the measured voltage as an actual voltage U, and when the setting is finished, the control unit compares the actual voltage U with a preset voltage to determine a carrier frequency R;
the control unit is further provided with preset voltages and carrier frequency adjusting parameters, wherein the preset voltages comprise a first preset voltage U1, a second preset voltage U2 and a third preset voltage U3, and U1 is more than U2 and less than U3; the carrier frequency adjustment parameters include a carrier frequency first adjustment parameter σ 1, a carrier frequency second adjustment parameter σ 2, a carrier frequency third adjustment parameter σ 3, and a carrier frequency fourth adjustment parameter σ 4, where σ 1 > σ 2 > σ 3 > σ 4 and σ 1+ σ 2+ σ 3+ σ 4= 2;
if U < U1, the control unit calculates a carrier frequency R, setting R = Ux [ U/(U1-U) ]. times σ 1;
if U1 is equal to or less than U < U2, the control unit calculates a carrier frequency R, setting R = Ux [ (U2-U)/(U-U1) ] × σ 2;
if U2 is equal to or less than U < U3, the control unit calculates a carrier frequency R, setting R = Ux [ (U3-U)/(U-U2) ] × σ 3;
if U is larger than or equal to U3, the control unit calculates carrier frequency R and sets R = [ (U-U3)/U3 ] multiplied by sigma 4.
Further, when the induction motor is transformed, the capacitance detector is controlled to detect the capacitance of the permanent magnet synchronous motor, the control unit sets the measured capacitance as an actual capacitance Q, and when the setting is completed, the control unit compares the actual capacitance Q with a preset capacitance to determine a resonant frequency P;
the control unit is further provided with preset capacitors comprising a first preset capacitor Q1, a second preset capacitor Q2 and a third preset capacitor Q3, wherein Q1 is more than Q2 and more than Q3;
if Q < Q1, the control unit calculates the resonance frequency P, setting P =60% × Q × P0;
if Q1 is not less than Q < Q2, the control unit calculates the resonance frequency P, setting P =70% xQxP 0;
if Q2 is not less than Q < Q3, the control unit calculates the resonance frequency P, setting P =80% xQxP 0;
if Q is greater than or equal to Q3, the control unit calculates the resonant frequency P, and sets P =90% multiplied by Q multiplied by P0;
wherein P0 denotes the standard resonance frequency, set by the control unit.
Compared with the prior art, the invention has the advantages that the frequency of the induction motor is adjusted and the permanent magnet synchronous motor is driven by arranging the variable frequency driver, when the permanent magnet synchronous motor is modified, the carrier frequency generated by the variable frequency driver is compared with the resonance frequency generated by the permanent magnet synchronous motor to determine whether the rotor power needs to be adjusted, the rotor power needs to be adjusted is further determined by the first frequency difference value, the second frequency difference value and the preset frequency difference value, if the rotor power needs to be adjusted, the adjusting valve is controlled to rotate so that the rotor is connected with leads with different thicknesses in series to adjust the rotor power, the actual voltage of the variable frequency driver is compared with the preset voltage to determine the carrier frequency, the actual capacitor of the permanent magnet synchronous motor is compared with the preset capacitor to determine the resonance frequency, wherein the actual voltage is measured by the voltage detector, and the actual capacitance Q is measured by a capacitance detector. Therefore, the carrier frequency generated by the variable-frequency driver can be far away from the resonant frequency generated by the permanent magnet synchronous motor, the dependence of the whole system on devices is reduced, and the stability of the whole system is obviously improved.
In particular, the variable frequency driver of the invention adopts a sensorless high-precision vector variable frequency controller as a power supply of the driving device, and does not need to additionally arrange a position sensor in a motor, thereby saving the volume and the cost of the part. The motor mathematical model is accurately determined by self-learning and self-setting aiming at the motors with different power levels, and the flux linkage position and the current time phase of the motor are obtained through the extended Kalman filter algorithm, so that the motor is accurately controlled. The extended Kalman filter algorithm can effectively weaken the influence of random interference and measurement noise, and is very beneficial to the stable operation of an outdoor pumping unit system. On the basis, when the well conditions have the problems of overvoltage, overcurrent and the like, protective measures are taken for the motor, the motor is prevented from being burnt out, and the brake is timely carried out, so that the safety of the whole system is obviously improved. The control precision of the system is improved, the corresponding driving permanent magnet synchronous motor can be designed into multiple poles, so that the running frequency of the motor is reduced, the loss is reduced, the stable vibration is small when the motor runs at medium, low and high speeds, meanwhile, the vector control technology obviously improves the starting capability and the overload capability of the motor, the whole system does not need to be started by a starter of an induction motor, and the comprehensive performance of a driving device is improved.
In particular, the invention adopts the extended Kalman filter algorithm to carry out sensorless vector control, does not need the traditional position sensor to detect the position of the motor rotor, and can better adapt to the external interference on the basis of the existing control system. The essence of the method is a control method based on a mathematical model, and the internal state variables of the correction motor are continuously adjusted by calculating a filter loop and gain so as to adapt to the dynamic characteristics of a control object and disturbance, so that the method has good dynamic property and robustness.
Particularly, the rotor is formed by laminating castings or punching sheets and is of a built-in or surface-mounted magnetic pole structure; at least 4 iron core slots are arranged below each pair of magnetic poles; the rotor is designed into a multi-pole structure to enable the rotating speed of the motor to work in a reasonable range, and the rotor can adopt a built-in structure to strengthen the strength of the rotor of the motor and reduce the heating of magnetic steel so as to reduce the possibility of demagnetization, and the stability of the motor is improved. Meanwhile, the graphene coating is sprayed on the surface of the rotor (containing surface-mounted magnetic steel), so that the condition of local overheating high-temperature magnetic loss of the rotor magnetic steel in the traditional motor is avoided. The graphene is adopted to improve the temperature rise condition of the rotor, so that the rotor does not have local hot spots, and the problem of local overheating of magnetic steel of the permanent magnet motor caused by armature reaction is solved.
Particularly, for the prior art, the traditional position detection sensor is omitted, so that the dependence of the whole system on devices is reduced, the stability of the whole system is obviously improved, and the problems of magnetic steel demagnetization and the like caused by rotor heating can be reduced because the graphene coating sprayed outside the rotor (including surface-mounted magnetic steel) has high heat conductivity coefficient.
Further, the method comprises the steps of comparing a carrier frequency R generated by a variable frequency driver with a resonance frequency P generated by a permanent magnet synchronous motor to determine whether the rotor power needs to be adjusted or not, further determining whether the rotor power needs to be adjusted or not through a first frequency difference Da, a second frequency difference Db and a preset frequency difference D0, controlling a regulating valve to rotate to enable a rotor to be connected with wires with different thicknesses in series to adjust the rotor power if the rotor power needs to be adjusted, comparing an actual voltage U of the variable frequency driver with a preset voltage to determine the carrier frequency R, and comparing an actual capacitor Q of the permanent magnet synchronous motor with the preset capacitor to determine the resonance frequency P, wherein the actual voltage U is measured by a voltage detector, and the actual capacitor Q is measured by a capacitor detector. Therefore, the carrier frequency generated by the variable-frequency driver can be far away from the resonant frequency generated by the permanent magnet synchronous motor, the dependence of the whole system on devices is reduced, and the stability of the whole system is obviously improved.
Furthermore, the carrier frequency R is compared with the resonance frequency P to determine whether the rotor power needs to be adjusted, and when the control unit determines that the rotor power needs to be adjusted, the control unit controls the adjusting valve to rotate so as to enable the rotor to be connected with wires with different thicknesses in series, so that the carrier frequency generated by the variable-frequency driver is far away from the resonance frequency generated by the permanent magnet synchronous motor, the dependence of the whole system on devices is reduced, and the stability of the whole system is remarkably improved.
Furthermore, the first frequency difference Da is compared with the preset frequency difference D0 to determine whether the power of the rotor needs to be adjusted, and when the control unit determines that the power of the rotor needs to be adjusted, the control unit controls the adjusting valve to rotate so that the rotor is connected with wires with different thicknesses in series, so that the carrier frequency generated by the variable frequency driver is far away from the resonant frequency generated by the permanent magnet synchronous motor, the dependence of the whole system on devices is reduced, and the stability of the whole system is obviously improved.
Further, the invention compares the noise intensity W with a preset noise intensity to determine a frequency difference calculation parameter, and further determines a second frequency difference Db through a preset formula, wherein the frequency difference calculation parameter aims to determine the second frequency difference through the noise intensity, and further determines whether the rotor power needs to be adjusted.
Furthermore, the second frequency difference Db is compared with the preset frequency difference D0 to determine whether the power of the rotor needs to be adjusted, and when the control unit determines that the power of the rotor needs to be adjusted, the control unit controls the adjusting valve to rotate so that the rotor is connected with wires with different thicknesses in series, so that the carrier frequency generated by the variable frequency driver is far away from the resonant frequency generated by the permanent magnet synchronous motor, the dependence of the whole system on devices is reduced, and the stability of the whole system is obviously improved.
Furthermore, the actual voltage U is compared with the preset voltage to determine the carrier frequency R, so that the carrier frequency generated by the variable-frequency driver is far away from the resonant frequency generated by the permanent magnet synchronous motor, the dependence of the whole system on devices is reduced, and the stability of the whole system is obviously improved.
Furthermore, the resonance frequency P is determined by comparing the actual capacitor Q with the preset capacitor, so that the carrier frequency generated by the variable-frequency driver is far away from the resonance frequency generated by the permanent magnet synchronous motor, the dependence of the whole system on devices is reduced, and the stability of the whole system is obviously improved.
Drawings
Fig. 1 is a schematic structural diagram of a modified permanent magnet synchronous motor dragging device of an induction motor according to an embodiment of the present invention;
FIG. 2 is a side view of a wire guiding device of a PMSM dragging device modified by an induction motor according to an embodiment of the present invention;
the notation in the figure is: 1. a variable frequency drive; 2. a wire guide device; 21. adjusting a valve; 22. a wire; 3. a permanent magnet synchronous motor; 31. a rotor; 4. a voltage detector; 5. a capacitance detector; 6. an intensity detection sensor.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of a modified permanent magnet synchronous motor dragging device of an induction motor according to an embodiment of the present invention, and fig. 2 is a side view structural diagram of a wire device of the modified permanent magnet synchronous motor dragging device of the induction motor according to the embodiment of the present invention, the present invention provides a modified permanent magnet synchronous motor dragging device of an induction motor, including:
the variable frequency driver 1 is used for adjusting the frequency of the induction motor and driving the permanent magnet synchronous motor 3;
the lead device 2 is connected with the variable frequency driver 1 and is provided with an adjusting valve 21 and N leads 22, N is more than or equal to 6, the leads 22 are arranged in the lead device 2, the N leads 22 are made of the same material but have different thicknesses, the adjusting valve 21 is arranged outside the lead device 2, the adjusting valve 21 is rotated clockwise to enable the leads 22 connected with the rotor 31 to be thicker, and the adjusting valve 21 is rotated anticlockwise to enable the leads 22 connected with the rotor 31 to be thinner;
a permanent magnet synchronous motor 3 connected with the lead wire device 2, wherein a rotor 31 is arranged in the permanent magnet synchronous motor 3 for adjusting the resonance frequency generated by the permanent magnet synchronous motor 3 through power adjustment;
the voltage detector 4 is connected with the variable frequency driver 1 and is used for detecting the voltage of the variable frequency driver 1;
a capacitance detector 5 connected to the permanent magnet synchronous motor 3 for detecting a capacitance of the permanent magnet synchronous motor 3;
a strength detection sensor 6 connected to the permanent magnet synchronous motor 3 for detecting the strength of noise generated from the rotor 31;
a control unit (not shown in the figure), which is connected to the variable frequency driver 1, the wire device 2, the permanent magnet synchronous motor 3, the voltage detector 4, the capacitance detector 5 and the strength detection sensor 6, and is used for controlling the frequency adjustment process when the induction motor is modified;
when the induction motor is modified, the control unit compares a carrier frequency R generated by the variable frequency driver 1 with a resonance frequency P generated by the permanent magnet synchronous motor 3 to determine whether the power of the rotor 31 needs to be adjusted, further determines whether the power of the rotor 31 needs to be adjusted through a first frequency difference Da, a second frequency difference Db and a preset frequency difference D0, controls the adjusting valve 21 to rotate to enable the rotor 31 to be connected with wires 22 with different thicknesses in series to adjust the power of the rotor 31 if the power of the rotor 31 needs to be adjusted, compares an actual voltage U of the variable frequency driver 1 with a preset voltage to determine the carrier frequency R, and compares an actual capacitor Q of the permanent magnet synchronous motor 3 with a preset capacitor to determine the resonance frequency P;
the actual voltage U is measured by a voltage detector 4, and the actual capacitance Q is measured by a capacitance detector 5.
In this embodiment, the wires 22 have different thicknesses and different resistances, and in the case of series connection, the thicker the wire 22, the smaller the resistance, and the thinner the wire 22, the larger the resistance. The control unit is internally provided with a PLDa control panel. The variable frequency driver 1 adopts a vector control mode to be matched with a sensorless control technology to accurately control the driving motor to drive the permanent magnet synchronous motor 3. The high-precision vector frequency converter is an integrated high-precision device, can ensure that the permanent magnet synchronous motor 3 has good performance under wide rotating speed by adjusting control parameters, and realizes the vector control of the motor by an internal adaptive algorithm and an extended Kalman filter algorithm. The rotor 31 is formed by laminating castings or punching sheets, and the rotor 31 is of a built-in or surface-mounted magnetic pole structure; at least 4 iron core slots are arranged below each pair of magnetic poles; the rotor 31 is designed into a multi-pole structure, so that the rotating speed of the motor works in a reasonable range, the rotor 31 can adopt a built-in structure to strengthen the strength of the motor rotor 31 and reduce the heating of magnetic steel so as to reduce the possibility of demagnetization, and the stability of the motor is improved. Meanwhile, the graphene coating is sprayed on the surface of the rotor 31 (containing surface-mounted magnetic steel), so that the condition of local overheating high-temperature magnetic loss of the rotor 31 magnetic steel in the traditional motor is avoided.
Specifically, the present invention determines whether rotor 31 power needs to be adjusted by comparing the carrier frequency R generated by the variable frequency drive 1 with the resonant frequency P generated by the permanent magnet synchronous motor 3, and further determining whether the power of the rotor 31 needs to be adjusted or not by the first frequency difference Da, the second frequency difference Db and the preset frequency difference D0, if the power of the rotor 31 needs to be adjusted, controlling the adjusting valve 21 to rotate so that the rotor 31 is connected in series with wires 22 of different thicknesses so as to adjust the power of the rotor 31, comparing the actual voltage U of the variable frequency driver 1 with the preset voltage so as to determine the carrier frequency R, comparing the actual capacitance Q of the permanent magnet synchronous motor 3 with the preset capacitance so as to determine the resonant frequency P, the actual voltage U is measured by the voltage detector 4, and the actual capacitance Q is measured by the capacitance detector 5. Therefore, the carrier frequency generated by the variable frequency driver 1 can be far away from the resonant frequency generated by the permanent magnet synchronous motor 3, the dependence of the whole system on devices is reduced, and the stability of the whole system is obviously improved.
Specifically, the sensorless high-precision vector variable frequency controller is used as a power supply of the driving device, and a position sensor is not required to be additionally arranged in the motor, so that the volume and the cost of the part are saved. The motor mathematical model is accurately determined by self-learning and self-setting aiming at the motors with different power levels, and the flux linkage position and the current time phase of the motor are obtained through the extended Kalman filter algorithm, so that the motor is accurately controlled. The extended Kalman filter algorithm can effectively weaken the influence of random interference and measurement noise, and is very beneficial to the stable operation of an outdoor pumping unit system. On the basis, when the well conditions have the problems of overvoltage, overcurrent and the like, protective measures are taken for the motor, the motor is prevented from being burnt out, and the brake is timely carried out, so that the safety of the whole system is obviously improved. The control precision of the system is improved, the corresponding driving permanent magnet synchronous motor 3 can be designed into multiple poles, so that the running frequency of the motor is reduced, the loss is reduced, the stable vibration is small when the motor runs at medium, low and high speeds, meanwhile, the vector control technology obviously improves the starting capability and the overload capability of the motor, the whole system does not need to be started by a starter of an induction motor, and the comprehensive performance of a driving device is improved.
Specifically, when the power of the rotor 31 needs to be adjusted, if Da < D1, the control unit controls the adjusting valve 21 to rotate clockwise j screens, so that the conducting wire 22 connected with the rotor 31 becomes thick, the resistance becomes small, the power of the rotor 31 becomes large, and j = INT ([ (1/2) × N ]);
if D1 is not less than Da and not more than D2, the control unit controls the regulating valve 21 to rotate clockwise j screens, so that the conducting wire 22 connected with the rotor 31 becomes thicker, the resistance becomes smaller, the power of the rotor 31 becomes larger, and j = INT ([ (1/3). times.N ]);
if D2 is not less than Da and not more than D3, the control unit controls the regulating valve 21 to rotate clockwise j screens, so that the conducting wire 22 connected with the rotor 31 becomes thicker, the resistance becomes smaller, the power of the rotor 31 becomes larger, and j = INT ([ (1/4). times.N ]);
if Da is larger than or equal to D3, the control unit controls the regulating valve 21 to rotate clockwise j screens, so that the conducting wire 22 connected with the rotor 31 becomes thick, the resistance becomes small, the power of the rotor 31 becomes large, and j = INT ([ (1/5). times.N ]);
if Db is less than D1, the control unit controls the regulating valve 21 to rotate counterclockwise by j screens, so that the lead 22 connected with the rotor 31 becomes thin, the resistance becomes large, and the power of the rotor 31 becomes small, and j = INT ([ (1/3). times.N ]);
if Db is more than or equal to D1 and less than or equal to D2, the control unit controls the regulating valve 21 to rotate counterclockwise by j screens, so that the lead 22 connected with the rotor 31 becomes thin, the resistance becomes large, the power of the rotor 31 becomes small, and j = INT ([ (1/4). times.N ]);
if Db is more than or equal to D2 and less than or equal to D3, the control unit controls the regulating valve 21 to rotate counterclockwise by j screens, so that the lead 22 connected with the rotor 31 becomes thin, the resistance becomes large, the power of the rotor 31 becomes small, and j = INT ([ (1/5). times.N ]);
if Db is larger than or equal to D3, the control unit controls the regulating valve 21 to rotate counterclockwise by j screens, so that the lead 22 connected with the rotor 31 becomes thin, the resistance becomes large, the power of the rotor 31 becomes small, and j = INT ([ (1/6) × N ]);
where Di represents the diameter ith standard frequency difference, setting i =1,2, 3.
In this embodiment, each time the control valve 21 is rotated by one position, the wire 22 connected to the rotor 31 is replaced by one wire in the direction of rotation. The control unit is internally provided with standard frequency difference values including a first standard frequency difference value D1, a second standard frequency difference value D2 and a third standard frequency difference value D3, wherein D1 < D2 < D3. There is no relation between the standard frequency difference and the preset frequency difference.
Specifically, when the induction motor is modified, the control unit acquires the carrier frequency generated by the variable frequency driver 1 and sets the carrier frequency as R, when the setting is completed, the control unit acquires the resonance frequency generated by the permanent magnet synchronous motor 3 and sets the resonance frequency as P, when the setting is completed, the control unit compares the carrier frequency R with the resonance frequency P to determine whether the power of the rotor 31 needs to be adjusted, and when the control unit determines that the power of the rotor 31 needs to be adjusted, the control unit controls the adjusting valve 21 to rotate so that the rotor 31 is connected in series with the wires 22 with different thicknesses;
if R < P, the control unit judges whether the power of the rotor 31 needs to be adjusted or not according to the noise intensity generated by the rotor 31;
if R = P, the control unit determines that the power of the rotor 31 needs to be adjusted;
if R > P, the control unit determines that it is necessary to adjust the power of the rotor 31 in combination with the first difference in frequency.
Specifically, the carrier frequency R is compared with the resonance frequency P to determine whether the power of the rotor 31 needs to be adjusted, and when the control unit determines that the power of the rotor 31 needs to be adjusted, the control unit controls the adjusting valve 21 to rotate so that the rotor 31 is connected with the wires 22 with different thicknesses in series, so that the carrier frequency generated by the variable frequency driver 1 is far away from the resonance frequency generated by the permanent magnet synchronous motor 3, the dependence of the whole system on devices is reduced, and the stability of the whole system is obviously improved.
Specifically, when the control unit determines whether the power of the rotor 31 needs to be adjusted or not by combining the frequency difference, the control unit calculates a first frequency difference Da, when the calculation is completed, the control unit compares the first frequency difference Da with a preset frequency difference D0 to determine whether the power of the rotor 31 needs to be adjusted or not, and when the control unit determines that the power of the rotor 31 needs to be adjusted, the control unit controls the adjusting valve 21 to rotate so that the rotor 31 is connected with the leads 22 with different thicknesses in series;
if Da is less than or equal to D0, the control unit judges that the power of the rotor 31 needs to be adjusted;
if Da > D0, the control unit determines that rotor 31 power adjustment is not necessary.
Specifically, the invention compares the first frequency difference Da with the preset frequency difference D0 to determine whether the power of the rotor 31 needs to be adjusted, and when the control unit determines that the power of the rotor 31 needs to be adjusted, the control unit controls the adjusting valve 21 to rotate so as to connect the rotor 31 in series with the wires 22 with different thicknesses, so that the dependence of the whole system on the devices is reduced by separating the carrier frequency generated by the variable frequency driver 1 from the resonant frequency generated by the permanent magnet synchronous motor 3, and the stability of the whole system is remarkably improved.
Specifically, when the control unit determines whether the power of the rotor 31 needs to be adjusted or not in combination with the frequency difference, the control unit calculates a frequency first difference Da, which is calculated as follows:
Da=R-P；
in the formula, R represents a carrier frequency generated by the variable frequency drive 1, and P represents a resonance frequency generated by the permanent magnet synchronous motor 3.
Specifically, when the control unit determines whether the power of the rotor 31 needs to be adjusted or not in combination with the intensity of the noise generated by the rotor 31, the control unit controls the noise intensity detection sensor 6 to detect the intensity of the noise generated by the rotor 31 and sets the detected noise intensity as W, and when the setting is completed, the control unit compares the noise intensity W with a preset noise intensity to determine a frequency difference calculation parameter;
the control unit is provided with preset noise intensity and frequency difference value calculation parameters, wherein the preset noise intensity comprises a first preset noise intensity W1, a second preset noise intensity W2 and a third preset noise intensity W3, and W1 is more than W2 and less than W3; the frequency difference calculation parameters comprise a frequency difference first calculation parameter K1, a frequency difference second calculation parameter K2, a frequency difference third calculation parameter K3 and a frequency difference fourth calculation parameter K4, wherein the calculation parameters are not equal to each other and K1+ K2+ K3+ K4= 1;
if W is less than W1, the control unit determines that the frequency difference calculation parameter is K1;
if W1 is not less than W2, the control unit judges that the frequency difference calculation parameter is K2;
if W2 is not less than W3, the control unit judges that the frequency difference calculation parameter is K3;
if W is larger than or equal to W3, the control unit judges that the frequency difference calculation parameter is K4.
Specifically, the present invention determines the frequency difference value Db by comparing the noise intensity W with the preset noise intensity, and then determines the second frequency difference value Db by using the preset formula, wherein the frequency difference value calculation parameter is to determine the second frequency difference value by using the noise intensity, and then determine whether the power of the rotor 31 needs to be adjusted.
Specifically, when the control unit determines that the frequency difference calculation parameter is Ki, the control unit calculates a second frequency difference Db, sets Db = (P-R) × Ki, and sets i =1,2,3,4, when the calculation is completed, the control unit compares the second frequency difference Db with a preset frequency difference D0 to determine whether the power of the rotor 31 needs to be adjusted, and when the control unit determines that the power of the rotor 31 needs to be adjusted, the control unit controls the adjusting valve 21 to rotate so that the rotor 31 is connected in series with the wires 22 with different thicknesses;
if Db is less than or equal to D0, the control unit judges that the power of the rotor 31 needs to be adjusted;
if Db > D0, the control unit determines that rotor 31 power adjustment is not necessary.
Specifically, the second frequency difference Db is compared with the preset frequency difference D0 to determine whether the power of the rotor 31 needs to be adjusted, and when the control unit determines that the power of the rotor 31 needs to be adjusted, the control unit controls the adjusting valve 21 to rotate so as to connect the rotor 31 in series with the wires 22 with different thicknesses, so that the dependence of the whole system on devices is reduced and the stability of the whole system is remarkably improved by separating the carrier frequency generated by the variable frequency driver 1 from the resonant frequency generated by the permanent magnet synchronous motor 3.
Specifically, when the induction motor is modified, the voltage detector 4 is controlled to detect the voltage of the variable frequency driver 1, the control unit sets the measured voltage as an actual voltage U, and when the setting is completed, the control unit compares the actual voltage U with a preset voltage to determine a carrier frequency R;
the control unit is further provided with preset voltages and carrier frequency adjusting parameters, wherein the preset voltages comprise a first preset voltage U1, a second preset voltage U2 and a third preset voltage U3, and U1 is more than U2 and less than U3; the carrier frequency adjustment parameters include a carrier frequency first adjustment parameter σ 1, a carrier frequency second adjustment parameter σ 2, a carrier frequency third adjustment parameter σ 3, and a carrier frequency fourth adjustment parameter σ 4, where σ 1 > σ 2 > σ 3 > σ 4 and σ 1+ σ 2+ σ 3+ σ 4= 2;
if U < U1, the control unit calculates a carrier frequency R, setting R = Ux [ U/(U1-U) ]. times σ 1;
if U1 is equal to or less than U < U2, the control unit calculates a carrier frequency R, setting R = Ux [ (U2-U)/(U-U1) ] × σ 2;
if U2 is equal to or less than U < U3, the control unit calculates a carrier frequency R, setting R = Ux [ (U3-U)/(U-U2) ] × σ 3;
if U is larger than or equal to U3, the control unit calculates carrier frequency R and sets R = [ (U-U3)/U3 ] multiplied by sigma 4.
Specifically, the carrier frequency R is determined by comparing the actual voltage U with the preset voltage, so that the carrier frequency generated by the variable frequency drive 1 is far away from the resonant frequency generated by the permanent magnet synchronous motor 3, the dependence of the whole system on devices is reduced, and the stability of the whole system is obviously improved.
Specifically, when the induction motor is modified, the capacitance detector 5 is controlled to detect the capacitance of the permanent magnet synchronous motor 3, the control unit sets the measured capacitance as an actual capacitance Q, and when the setting is completed, the control unit compares the actual capacitance Q with a preset capacitance to determine a resonant frequency P;
the control unit is further provided with preset capacitors comprising a first preset capacitor Q1, a second preset capacitor Q2 and a third preset capacitor Q3, wherein Q1 is more than Q2 and more than Q3;
if Q < Q1, the control unit calculates the resonance frequency P, setting P =60% × Q × P0;
if Q1 is not less than Q < Q2, the control unit calculates the resonance frequency P, setting P =70% xQxP 0;
if Q2 is not less than Q < Q3, the control unit calculates the resonance frequency P, setting P =80% xQxP 0;
if Q is greater than or equal to Q3, the control unit calculates the resonant frequency P, and sets P =90% multiplied by Q multiplied by P0;
wherein P0 denotes the standard resonance frequency, set by the control unit.
Specifically, the resonance frequency P is determined by comparing the actual capacitor Q with the preset capacitor, so that the carrier frequency generated by the variable frequency driver 1 is far away from the resonance frequency generated by the permanent magnet synchronous motor 3, the dependence of the whole system on devices is reduced, and the stability of the whole system is obviously improved.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (8)
1. The utility model provides an induction machine reforms transform PMSM drive arrangement which characterized in that includes:
the variable frequency driver is used for adjusting the frequency of the induction motor and driving the permanent magnet synchronous motor;
the wire device is connected with the variable frequency driver and is provided with an adjusting valve and N wires, N is more than or equal to 6, the wires are arranged in the wire device, the N wires are made of the same material and have different thicknesses, the adjusting valve is arranged outside the wire device, the adjusting valve is rotated clockwise to thicken the wires connected with the rotor, and the adjusting valve is rotated anticlockwise to thin the wires connected with the rotor;
the permanent magnet synchronous motor is connected with the wire device, and a rotor is arranged in the permanent magnet synchronous motor and used for adjusting the resonance frequency generated by the permanent magnet synchronous motor through power adjustment;
the voltage detector is connected with the variable-frequency driver and used for detecting the voltage of the variable-frequency driver;
the capacitance detector is connected with the permanent magnet synchronous motor and used for detecting the capacitance of the permanent magnet synchronous motor;
the intensity detection sensor is connected with the permanent magnet synchronous motor and used for detecting the intensity of noise generated by the rotor;
the control unit is connected with the variable frequency driver, the lead device, the permanent magnet synchronous motor, the voltage detector, the capacitance detector and the strength detection sensor and is used for controlling the frequency adjustment process when the induction motor is transformed;
when the induction motor is modified, the control unit compares a carrier frequency R generated by the variable frequency driver with a resonance frequency P generated by the permanent magnet synchronous motor to determine whether the rotor power needs to be adjusted, further determines whether the rotor power needs to be adjusted through a first frequency difference Da, a second frequency difference Db and a preset frequency difference D0, controls the adjusting valve to rotate to enable the rotor to be connected with wires with different thicknesses in series to adjust the rotor power if the rotor power needs to be adjusted, compares an actual voltage U of the variable frequency driver with a preset voltage to determine the carrier frequency R, and compares an actual capacitor Q of the permanent magnet synchronous motor with the preset capacitor to determine the resonance frequency P;
the actual voltage U is measured by a voltage detector, and the actual capacitance Q is measured by a capacitance detector.
2. The modified PMSM dragging device of claim 1, wherein when the rotor power needs to be adjusted, if Da < D1, the control unit controls the adjusting valve to rotate clockwise j screens, so that a wire connected with the rotor becomes thick, the resistance becomes small, and further the rotor power becomes large, and j = INT ([ (1/2) xN ]);
if D1 is not less than Da and not more than D2, the control unit controls the regulating valve to rotate j screens clockwise, so that a lead connected with the rotor becomes thick, the resistance becomes small, the power of the rotor becomes large, and j = INT ([ (1/3). times.N ]);
if D2 is not less than Da and not more than D3, the control unit controls the regulating valve to rotate j screens clockwise, so that a lead connected with the rotor becomes thick, the resistance becomes small, the power of the rotor becomes large, and j = INT ([ (1/4). times.N ]);
if Da is larger than or equal to D3, the control unit controls the regulating valve to rotate j screens clockwise, so that a lead connected with the rotor becomes thick, the resistance becomes small, the power of the rotor becomes large, and j = INT ([ (1/5). times.N ]);
if Db is less than D1, the control unit controls the regulating valve to rotate j screens anticlockwise so as to thin a wire connected with the rotor, increase the resistance and further reduce the power of the rotor, and j = INT ([ (1/3). times.N ]);
if Db is more than or equal to D1 and less than or equal to D2, the control unit controls the regulating valve to rotate j screens anticlockwise so as to thin a conducting wire connected with the rotor, increase the resistance and further reduce the power of the rotor, and j = INT ([ (1/4). times.N ]);
if Db is more than or equal to D2 and less than or equal to D3, the control unit controls the regulating valve to rotate j screens anticlockwise so as to thin a conducting wire connected with the rotor, increase the resistance and further reduce the power of the rotor, and j = INT ([ (1/5). times.N ]);
if Db is larger than or equal to D3, the control unit controls the regulating valve to rotate j screens anticlockwise so as to thin a lead connected with the rotor, increase the resistance and further reduce the power of the rotor, and j = INT ([ (1/6). times.N ]);
where Di represents the diameter ith standard frequency difference, setting i =1,2, 3;
when the control unit judges whether the rotor power needs to be adjusted or not by combining the frequency first difference, the control unit calculates the frequency first difference Da, and the calculation formula is as follows:
da = R-P; in the formula, R represents the carrier frequency generated by a variable frequency driver, and P represents the resonance frequency generated by a permanent magnet synchronous motor;
when the control unit judges whether the power of the rotor needs to be adjusted or not by combining the intensity of the noise generated by the rotor, the control unit calculates a second frequency difference Db, sets Db = (P-R) xKi, and sets i =1,2,3 and 4; wherein, Ki is a frequency difference value calculation parameter.
3. The modified PMSM dragging device of claim 2, wherein when the induction motor is modified, the control unit obtains and sets the carrier frequency generated by the variable frequency driver to R, when the setting is completed, the control unit obtains and sets the resonant frequency generated by the PMSM to P, when the setting is completed, the control unit compares the carrier frequency R with the resonant frequency P to determine whether the rotor power needs to be adjusted, and when the control unit determines that the rotor power needs to be adjusted, the control unit controls the adjusting valve to rotate so that the rotor is connected in series with wires with different thicknesses;
if R is less than P, the control unit judges whether the power of the rotor needs to be adjusted or not by combining the noise intensity generated by the rotor;
if R = P, the control unit judges that the rotor power needs to be adjusted;
if R > P, the control unit determines that it is necessary to adjust the rotor power in combination with the first difference in frequency.
4. The improved PMSM dragging device of claim 3, wherein when the control unit determines whether the rotor power needs to be adjusted or not in combination with the first frequency difference, the control unit calculates the first frequency difference Da, when the calculation is completed, the control unit compares the first frequency difference Da with a preset frequency difference D0 to determine whether the rotor power needs to be adjusted or not, and when the control unit determines that the rotor power needs to be adjusted, the control unit controls the adjusting valve to rotate so that the rotor is connected in series with wires of different thicknesses;
if Da is less than or equal to D0, the control unit judges that the power of the rotor needs to be adjusted;
if Da > D0, the control unit determines that rotor power adjustment is not necessary.
5. The improved PMSM dragging device of claim 3, wherein when the control unit determines whether the rotor power needs to be adjusted or not in combination with the noise intensity generated by the rotor, the control unit controls the noise intensity detection sensor to detect the noise intensity generated by the rotor and sets the detected noise intensity as W, and when the setting is completed, the control unit compares the noise intensity W with a preset noise intensity to determine a frequency difference calculation parameter;
the control unit is provided with preset noise intensity and frequency difference value calculation parameters, wherein the preset noise intensity comprises a first preset noise intensity W1, a second preset noise intensity W2 and a third preset noise intensity W3, and W1 is more than W2 and less than W3; the frequency difference calculation parameters comprise a frequency difference first calculation parameter K1, a frequency difference second calculation parameter K2, a frequency difference third calculation parameter K3 and a frequency difference fourth calculation parameter K4, wherein the calculation parameters are not equal to each other and K1+ K2+ K3+ K4= 1;
if W is less than W1, the control unit determines that the frequency difference calculation parameter is K1;
if W1 is not less than W2, the control unit judges that the frequency difference calculation parameter is K2;
if W2 is not less than W3, the control unit judges that the frequency difference calculation parameter is K3;
if W is larger than or equal to W3, the control unit judges that the frequency difference calculation parameter is K4.
6. The improved PMSM dragging device of claim 5, wherein when the control unit determines that the frequency difference calculation parameter is Ki, and when the calculation is completed, the control unit compares the second frequency difference Db with a preset frequency difference D0 to determine whether the rotor power needs to be adjusted, and when the control unit determines that the rotor power needs to be adjusted, the control unit controls the adjusting valve to rotate so that the rotor is connected with wires with different thicknesses in series;
if Db is less than or equal to D0, the control unit judges that the rotor power needs to be adjusted;
if Db > D0, the control unit determines that rotor power adjustment is not necessary.
7. The traction device of the transformed permanent magnet synchronous motor of claim 6, wherein when the induction motor is transformed, the voltage detector is controlled to detect the voltage of the variable frequency driver, the control unit sets the measured voltage as an actual voltage U, and when the setting is completed, the control unit compares the actual voltage U with a preset voltage to determine a carrier frequency R;
the control unit is further provided with preset voltages and carrier frequency adjusting parameters, wherein the preset voltages comprise a first preset voltage U1, a second preset voltage U2 and a third preset voltage U3, and U1 is more than U2 and less than U3; the carrier frequency adjustment parameters include a carrier frequency first adjustment parameter σ 1, a carrier frequency second adjustment parameter σ 2, a carrier frequency third adjustment parameter σ 3, and a carrier frequency fourth adjustment parameter σ 4, where σ 1 > σ 2 > σ 3 > σ 4 and σ 1+ σ 2+ σ 3+ σ 4= 2;
if U < U1, the control unit calculates a carrier frequency R, setting R = Ux [ U/(U1-U) ]. times σ 1;
if U1 is equal to or less than U < U2, the control unit calculates a carrier frequency R, setting R = Ux [ (U2-U)/(U-U1) ] × σ 2;
if U2 is equal to or less than U < U3, the control unit calculates a carrier frequency R, setting R = Ux [ (U3-U)/(U-U2) ] × σ 3;
if U is larger than or equal to U3, the control unit calculates carrier frequency R and sets R = [ (U-U3)/U3 ] multiplied by sigma 4.
8. The dragging device of the transformed permanent magnet synchronous motor of claim 7, wherein when the induction motor is transformed, the capacitance detector is controlled to detect the capacitance of the permanent magnet synchronous motor, the control unit sets the measured capacitance as an actual capacitance Q, and when the setting is completed, the control unit compares the actual capacitance Q with a preset capacitance to determine a resonant frequency P;
the control unit is further provided with preset capacitors comprising a first preset capacitor Q1, a second preset capacitor Q2 and a third preset capacitor Q3, wherein Q1 is more than Q2 and more than Q3;
if Q < Q1, the control unit calculates the resonance frequency P, setting P =60% × Q × P0;
if Q1 is not less than Q < Q2, the control unit calculates the resonance frequency P, setting P =70% xQxP 0;
if Q2 is not less than Q < Q3, the control unit calculates the resonance frequency P, setting P =80% xQxP 0;
if Q is greater than or equal to Q3, the control unit calculates the resonant frequency P, and sets P =90% multiplied by Q multiplied by P0;
wherein P0 denotes the standard resonance frequency, set by the control unit.
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| FR2906944B1 (en) * | 2006-10-06 | 2009-05-15 | Schneider Toshiba Inverter | COMMON MODE FILTERING DEVICE AND SPEED VARIATOR COMPRISING SUCH A DEVICE |
| US7576500B2 (en) * | 2007-05-31 | 2009-08-18 | Gm Global Technology Operations, Inc. | Method and system for operating a motor to reduce noise in an electric vehicle |
| JP5673629B2 (en) * | 2012-08-29 | 2015-02-18 | 株式会社豊田自動織機 | LC filter protection device |
| CN107624216B (en) * | 2015-05-13 | 2020-04-03 | 伟肯有限公司 | Power electronic device |
| CN106787797A (en) * | 2016-12-23 | 2017-05-31 | 哈尔滨理工大学 | A kind of frequency changer circuit of permagnetic synchronous motor |
| US10530239B2 (en) * | 2018-03-05 | 2020-01-07 | Regal Beloit America, Inc. | Filter systems for reducing bearing current in high-frequency motor control systems |
| US10538169B2 (en) * | 2018-06-04 | 2020-01-21 | Ford Global Technologies, Llc | Motor operating region based random pulse width modulation |
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Effective date of registration: 20210825 Address after: 163000 Room 101, gate 1, No. 5-4, Yueyuan community, Xincheng North Street, Ranghulu District, Daqing City, Heilongjiang Province Applicant after: Jiang Hongtao Address before: 163000 jiutun, Qixin village, Huayuan Town, Lindian County, Daqing City, Heilongjiang Province Applicant before: HEILONGJIANG RUIXIN PERMANENT MAGNET MOTOR MANUFACTURING Co.,Ltd. |
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Application publication date: 20210706 Assignee: Daqing Oilfield Petroleum Special Equipment Co.,Ltd. Assignor: Jiang Hongtao Contract record no.: X2022230000006 Denomination of invention: A driving device of permanent magnet synchronous motor modified by induction motor Granted publication date: 20211015 License type: Common License Record date: 20220117 |