CN112202389A - Temperature distribution measuring method, system and hardware device thereof - Google Patents
Temperature distribution measuring method, system and hardware device thereof Download PDFInfo
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- CN112202389A CN112202389A CN202011055565.1A CN202011055565A CN112202389A CN 112202389 A CN112202389 A CN 112202389A CN 202011055565 A CN202011055565 A CN 202011055565A CN 112202389 A CN112202389 A CN 112202389A
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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
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
- H02P29/66—Controlling or determining the temperature of the rotor
- H02P29/662—Controlling or determining the temperature of the rotor the rotor having permanent magnets
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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
- 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 discloses a temperature distribution measuring method, belongs to the technical field of motor rotor temperature calculating methods, and solves the technical problem that the accuracy of calculating the motor rotor temperature by using the method in the prior art is low. The method is applied to the measurement of the temperature of the rotor of the permanent magnet synchronous motor, the rotor is made of magnetic steel materials, and the method comprises the following steps: determining a first magnetic steel temperature, wherein the first magnetic steel temperature is determined according to a flux linkage value of a rotor; the flux linkage value is determined according to working parameters of the rotor in a preset working state; determining the temperature of second magnetic steel, wherein the temperature of the second magnetic steel is determined according to the actual operation parameters of the permanent magnet synchronous motor; and determining the temperature of the rotor according to the temperature of the first magnetic steel and the temperature of the second magnetic steel, and a system and a hardware device for measuring temperature distribution. The method is used for perfecting the function of the rotor temperature calculation method, considering the influence factors of the control circuit in the motor and meeting the high requirement of people on the temperature calculation precision of the motor rotor.
Description
Technical Field
The invention belongs to the technical field of motor rotor temperature calculation methods, and particularly relates to a temperature distribution measurement method, a system and a hardware device thereof.
Background
The permanent magnet synchronous motor provides excitation by the permanent magnet, so that the structure of the motor is simpler, the processing and assembling cost is reduced, a collecting ring and an electric brush which are easy to cause problems are omitted, and the running reliability of the motor is improved; and because excitation current is not needed, excitation loss is avoided, and the efficiency and the power density of the motor are improved. In the operation process of the motor, the temperature of internal parts of the motor is increased due to electromagnetic loss and friction loss, and if the temperature exceeds the allowable temperature of the insulating layer, the insulating layer is failed, so that short-circuit fault occurs.
In the method in the prior art, the publication number is 'CN 101275871B', and the temperature of the rotor is determined by the sum of the average value of the temperatures of the rotor in the deceleration state and the average values of the temperatures of the rotor in different critical states;
the prior art method, publication "CN 110912482A", uses the acquisition of a rotor i within a preset time perioddThe sum of the average temperatures of the rotors in the state equal to zero or not equal to zero determines the temperature of the rotor.
The inventors of the present application have found that the prior art method has the following drawbacks:
in the prior art, the actual temperature of the electronic rotor is taken as the core for measuring the temperature of the rotor, and the theoretical temperature is not known, for example, the flux linkage value verifies the actual temperature so as to avoid the influence of a plurality of uncontrollable factors in the actual process, so that the accuracy of the calculated rotor temperature is reduced.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a temperature distribution measuring method, which solves the technical problem of lower accuracy of the method for calculating the temperature of a motor rotor in the prior art.
On one hand, the method for measuring the temperature distribution is disclosed, which is applied to the measurement of the temperature of the rotor of the permanent magnet synchronous motor, the rotor is made of magnetic steel materials, and the method comprises the following steps:
determining a first magnetic steel temperature, wherein the first magnetic steel temperature is determined according to a flux linkage value of a rotor; the flux linkage value is determined according to working parameters of the rotor in a preset working state;
determining the temperature of second magnetic steel, wherein the temperature of the second magnetic steel is determined according to the actual operation parameters of the permanent magnet synchronous motor;
and determining the temperature of the rotor according to the temperature of the first magnetic steel and the temperature of the second magnetic steel.
Use first magnet steel temperature and second magnet steel temperature, can avoid the interference of a great deal of factors of environment, make the temperature of calculating the rotor, the actual temperature value of rotor more presses close to, for example, when having avoided the magnet steel to adopt different materials, the resistance is different and along with the influence of environmental change, calculate the temperature of rotor through first magnet steel temperature check second magnet steel temperature, this temperature more coincide or press close to with rotor actual temperature, improve the accuracy of rotor temperature calculated value, ensure the stable and safe operation of motor.
In a preferred or optional aspect, the method for determining the flux linkage value according to the operating parameter of the rotor in the preset operating state comprises:
acquiring a rotor torque value;
judging whether the torque value is zero, if so, acquiring working parameters of the rotor, and determining a flux linkage value of the rotor; and if not, not acquiring the working parameters of the rotor.
When the torque value is zero, the motor is in a working state, and the rotating speed of the rotor reaches the rated rotating speed. In actual work, people pay attention to the motor, mainly focus on the condition that the rotating speed of the rotor is full, and influence of factors of a circuit system can be avoided.
In a preferred or optional aspect, the method for determining the temperature of the first magnetic steel comprises:
acquiring data of a flux linkage value changing along with the temperature of the magnetic steel;
and determining the temperature of the first magnetic steel according to the determined flux linkage value of the rotor.
In a preferred or optional aspect, the method for determining the temperature of the second magnetic steel according to the actual operating parameter of the permanent magnet synchronous motor includes:
acquiring actual operating voltage and current parameters of the permanent magnet synchronous motor, and determining the operating loss of the permanent magnet synchronous motor;
and determining the temperature of the second magnetic steel according to the running loss.
In a preferred or optional aspect, the method for determining the temperature distribution of the rotor according to the temperature of the first magnetic steel and the temperature of the second magnetic steel comprises:
and judging whether the temperature of the first magnetic steel is equal to the temperature of the second magnetic steel, if so, acquiring the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the temperature of the rotor, otherwise, adjusting the thermal impedance and/or the thermal resistance model of the permanent magnet synchronous motor and/or the motor loss model until the temperature of the first magnetic steel is equal to the temperature of the second magnetic steel, acquiring the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the actual temperature of the rotor.
The temperature of the second magnetic steel is checked by taking the temperature of the first magnetic steel as a checking parameter, and as described above, the operating parameter of the temperature of the second magnetic steel under the current working condition does not necessarily represent the actual temperature of the motor, so that the temperature of the second magnetic steel is checked by the temperature of the first magnetic steel and the operating parameter of the temperature of the second magnetic steel under the current working condition is combined to calculate the actual temperature of the rotor or calculate the temperature of the rotor which is closer to the actual temperature of the rotor.
On the other hand provides a temperature distribution measuring system, is applied to the measurement of PMSM rotor temperature, and the rotor is made by the magnet steel material, the system includes:
the acquisition module is used for acquiring working parameters of the rotor in a preset working state and determining the temperature of the first magnetic steel; and a process for the preparation of the same,
the device is used for acquiring the actual operation parameters of the permanent magnet synchronous motor and determining the temperature of the second magnetic steel;
and the calculation module is used for determining the temperature of the rotor according to the acquired temperature of the first magnetic steel and the acquired temperature of the second magnetic steel.
In a preferred or alternative aspect, the obtaining module is further configured to,
acquiring a torque value of a current running state of a rotor, judging whether the torque value is zero or not, if so, acquiring working parameters of the rotor, and determining a flux linkage value of the rotor; and if not, not acquiring the working parameters of the rotor.
In a preferred or optional aspect, the obtaining module is further configured to:
and acquiring data of the flux linkage value changing along with the temperature of the magnetic steel, and determining the temperature of the first magnetic steel according to the determined flux linkage value of the rotor.
In a preferred or optional aspect, the obtaining module is further configured to:
acquiring actual operating voltage and current parameters of the permanent magnet synchronous motor, and determining the operating loss of the permanent magnet synchronous motor;
and determining the temperature of the second magnetic steel according to the running loss.
In a preferred or alternative aspect, the calculation module is further configured to:
and judging whether the temperature of the first magnetic steel is equal to the temperature of the second magnetic steel, if so, acquiring the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the temperature of the rotor, otherwise, adjusting the thermal impedance and/or the thermal resistance model of the permanent magnet synchronous motor and/or the motor loss model until the temperature of the first magnetic steel is equal to the temperature of the second magnetic steel, acquiring the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the actual temperature of the rotor.
On the other hand provides a temperature distribution measuring hardware device, is applied to the measurement of PMSM rotor temperature, and the rotor is made by the magnet steel material, includes:
a memory for storing non-transitory computer readable instructions; and
a processor for executing the computer readable instructions and configured to:
determining a first magnetic steel temperature, wherein the first magnetic steel temperature is determined according to a flux linkage value of a rotor; the flux linkage value is determined according to working parameters of the rotor in a preset working state;
determining the temperature of second magnetic steel, wherein the temperature of the second magnetic steel is determined according to the actual operation parameters of the permanent magnet synchronous motor;
and determining the temperature of the rotor according to the temperature of the first magnetic steel and the temperature of the second magnetic steel.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
the method provided by the technical scheme calculates the current theoretical temperature of the rotor, namely the temperature of the first magnetic steel and the actual temperature, and the actual temperature is the temperature of the second magnetic steel. The theoretical temperature is determined by the temperature of rotor magnetic steel, the rotor is made of magnetic steel material, the magnetic steel is commonly alnico, is synthesized by several hard strong metals such as iron, aluminum, nickel, cobalt and the like, and sometimes is synthesized by copper, niobium and tantalum, and is used for manufacturing super-hardness permanent magnet alloy. For example, the first magnet steel temperature is determined from a flux linkage-temperature curve by calculating the flux linkage value of the rotor. The temperature of the second magnetic steel can be determined by the actual operation parameters of the permanent magnet synchronous motor. And determining the temperature of the rotor according to the first magnetic steel temperature and the second magnetic steel temperature, for example, determining the actual temperature of the rotor by adjusting the thermal impedance of the motor. The first magnetic steel temperature and the second magnetic steel temperature are used, interference of a plurality of factors of the environment can be avoided, the temperature of the rotor is calculated, the actual temperature value of the rotor is closer to the actual temperature value of the rotor, for example, when the torque is zero, the actual current of the motor is zero or close to zero, the motor and the inductance voltage drop in the electric control power loop are zero, therefore, the electric control voltage is equal to the alternating voltage of the motor, namely, the interference factor of inductance or resistance or other components in the power loop on the motor is avoided, namely, the rotor flux linkage estimation is minimum, and the accuracy of rotor temperature calculation is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method of temperature distribution measurement of the present invention;
FIG. 2 is a flow chart of the temperature distribution measuring method of the present invention when torque is;
FIG. 3 is a flow chart of the temperature distribution measurement method of the present invention for determining the actual temperature of the rotor;
FIG. 4 is a flow chart of determining the actual temperature of the rotor when the temperature of the first magnetic steel is greater than the temperature of the second magnetic steel in the temperature distribution measuring method of the present invention;
FIG. 5 is an overall flow chart of the method of temperature distribution measurement of the present invention;
fig. 6 is a block diagram of a system for temperature distribution measurement of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in practical implementation, and the type, quantity and proportion of the components in practical implementation can be changed freely, and the layout of the components can be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details. In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The method for measuring temperature distribution as shown in fig. 1 is applied to the measurement of the temperature of a rotor of a permanent magnet synchronous motor, the rotor is made of magnetic steel, the magnetic steel is generally alnico, is synthesized by several hard strong metals such as iron, aluminum, nickel, cobalt and the like, and sometimes is synthesized by copper, niobium and tantalum, and is used for manufacturing ultra-hard permanent magnet alloy, and the method comprises the following steps:
s101, determining the temperature of first magnetic steel, wherein the temperature of the first magnetic steel is determined according to a flux linkage value of a rotor; the flux linkage value is determined according to working parameters of the rotor in a preset working state;
the determination of the temperature of the first magnetic steel is also the determination of the theoretical temperature of the rotor and is used for verifying the temperature of the actually monitored rotor. Determining the temperature of the first magnetic steel, for example, by using a "flux linkage-temperature curve" in technical standards in the field of motors, each flux linkage value can correspond to one magnetic steel temperature, and the flux linkage value can be determined according to working parameters of the rotor in a preset working state, such as by using a calculation formula of rotor flux linkage;
and S102, determining the temperature of second magnetic steel according to the actual operation parameters of the permanent magnet synchronous motor. For example, parameters such as voltage or current of the rotor under the current operation tool are obtained through a monitoring component, and the temperature of the second magnetic steel is determined through a mechanical loss-thermal resistance module in the prior art;
and S103, determining the temperature of the rotor according to the temperature of the first magnetic steel and the temperature of the second magnetic steel.
The technical scheme of this case is in following many theoretical guides, regard as the check-up value with first magnet steel temperature, use first magnet steel temperature and second magnet steel temperature to synthesize the evaluation, can avoid the interference of many factors of environment, make the temperature of calculating the rotor, the actual temperature value of more pressing close to the rotor, for example, when having avoided the winding to adopt different materials or structure, the influence of resistance difference to the temperature, calculate the temperature of rotor through first magnet steel temperature check-up second magnet steel temperature, this temperature more coincide or press close to with rotor actual temperature, improve the accuracy of rotor temperature calculated value, ensure stable and safe operation of motor, need point out, when the rotor temperature is too high, need make the preparation work of shutting down, therefore, the measurement of rotor temperature has decided whether the operation that the motor can be stable.
As shown in fig. 2, in an embodiment provided in the present disclosure, a method for determining a flux linkage value according to an operating parameter of a rotor in a preset operating state includes:
acquiring a rotor torque value; torque is a specific moment that causes an object to rotate. The torque of the engine is the torque output by the engine from the crankshaft. Under the condition of fixed power, the motor is in inverse proportion to the rotation speed of the engine, the higher the rotation speed is, the smaller the torque value of the rotor is, and the larger the rotation speed is, the larger the torque value is, and the load capacity of the motor in a certain range is reflected.
Judging whether the torque value of the rotor is zero, if so, acquiring the working parameters of the rotor, and determining the flux linkage value of the rotor; and if not, not acquiring the working parameters of the rotor. The technical scheme of the scheme considers the practical application of the motor, takes the temperature calculation of the rotor magnetic steel as an object, has more practical reference standard, reduces the redundant data of the computer, reduces the operation efficiency of the computer, and is closer to the temperature of the actual working condition of the rotor. For example, when the torque is zero, the actual current of the motor is zero or very close to zero, and the voltage drop of the inductance in the motor and the electronic control power loop is zero, so that the electronic control voltage is equal to the alternating voltage of the motor, that is, the interference of the inductance or the resistance or other components in the power loop on the motor voltage, that is, the rotor flux linkage estimation is avoided, and the accuracy of the rotor temperature calculation is improved.
In one embodiment provided in the present disclosure, a method for determining a temperature of a first magnetic steel includes:
and acquiring data of the flux linkage value changing along with the temperature of the magnetic steel, and determining the temperature of the first magnetic steel according to the determined flux linkage value of the rotor. For example, the estimation method of the rotor flux linkage includes the steps of collecting the motor rotation speed, q-axis voltage and d-axis current, determining a d-axis inductance value according to a table look-up of the d-axis current value, and according to a calculation formula of the rotor flux linkage, the method includes the following steps:
the flux linkage value of the rotor is (q-axis voltage/angular velocity) -d-axis current x d-axis inductance to calculate the flux linkage value. The temperature of the magnetic steel which should be theoretically reached is determined according to the flux linkage-magnetic steel temperature curve data, of course, the method for determining the temperature of the magnetic steel according to the flux linkage value should not be limited to the method, and other methods for determining the temperature of the magnetic steel according to the flux linkage value should also belong to the method in the present case, and are not limited to determining the temperature of the magnetic steel through a flux linkage-magnetic steel temperature curve.
Certainly, in order to obtain d-axis inductance values under different d-axis currents, motor calibration needs to be performed, the calibration method includes heating a rotor to a given temperature, measuring voltage, current and rotating speed values of the permanent magnet synchronous motor under different d-axis currents, further calculating the d-axis inductance values under different currents according to an electromagnetic equation of the permanent magnet synchronous motor, and averaging the d-axis inductance values to calculate the d-axis inductance values.
In a specific embodiment provided in the present disclosure, a method for determining a temperature of a second magnetic steel according to an actual operating parameter of a permanent magnet synchronous motor includes:
the method comprises the steps of obtaining working condition parameters of actual operation of the permanent magnet synchronous motor, wherein the working condition parameters comprise data of voltage, current parameters, rotating speed and the like, determining the operation loss of the permanent magnet synchronous motor according to the obtained working condition parameters, for example, determining through a motor loss model, and determining the temperature of second magnetic steel according to the operation loss, for example, determining through a thermal resistance model. The operating loss of the motor is obtained by measuring parameters such as operating voltage or operating current of the rotor under the current working condition according to a field monitoring circuit or components, and the like, and the current operating magnetic steel temperature of the rotor is determined according to the loss condition through a motor loss-thermal resistance module in the existing known method.
As shown in fig. 3, in an embodiment provided in the present disclosure, a method for determining a temperature distribution of a rotor according to a temperature of a first magnetic steel and a temperature of a second magnetic steel includes:
and judging whether the temperature of the first magnetic steel is equal to the temperature of the second magnetic steel, if so, acquiring the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the temperature of the rotor, otherwise, adjusting the thermal impedance and/or the thermal resistance model of the permanent magnet synchronous motor and/or the motor loss model until the temperature of the first magnetic steel is equal to the temperature of the second magnetic steel, acquiring the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the actual temperature of the rotor.
Specifically, as shown in fig. 4, it is determined whether the temperature of the first magnetic steel is greater than (not equal to or less than) the temperature of the first magnetic steel, if so, the thermal impedance of the motor is increased, and until the temperature values of the first magnetic steel and the temperature values of the second magnetic steel are equal, the stator temperature, the motor running loss parameter and the thermal resistance value of the permanent magnet synchronous motor under the current working condition are obtained, and the actual temperature of the rotor is determined by using the above formula;
or the light source is used for emitting light,
and judging whether the temperature of the first magnetic steel is lower than that of the first magnetic steel, reducing the thermal impedance of the motor until the temperatures of the first magnetic steel and the first magnetic steel are equal, acquiring the temperature of the stator, the running loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the actual temperature of the rotor. The method uses the temperature of the first magnetic steel to check the temperature of the second magnetic steel, thereby determining the actual temperature of the rotor magnetic steel.
The method for determining the temperature of the rotor comprises the following steps: the formula for calculating the loss of the rotor temperature is the rotor temperature plus the stator temperature plus the motor loss plus the motor thermal resistance, wherein: the temperature of the stator is actually detected by a detection system, the thermal resistance of the motor is a known value, and the motor loss can be determined according to the existing thermal resistance model, such as the motor running loss obtained by calculating the motor rotating speed, the voltage and the current value.
Of course, the motor is in the actual motion operating mode, and the actual influence factor is more and complicated, also can adopt second magnet steel temperature to carry out the check-up to first magnet steel temperature, as follows:
adjusting parameters in a motor loss model, such as parameters of three-phase voltage, current, rotating speed and the like of the motor, bringing the parameters into the loss model of the motor, recalculating the loss value of the motor, and/or adjusting parameters in a thermal resistance model, bringing motor loss into a thermal resistance network model of the motor, determining the temperature of second magnetic steel again by referring to the temperature of a stator, and obtaining the thermal resistance value, the motor loss and the temperature of the stator in the process of determining the temperature of the second magnetic steel at the moment until the newly determined temperature of the second magnetic steel is the same as the temperature of the first magnetic steel according to a formula: the stator temperature + motor losses-the motor thermal resistance-determines the actual temperature of the rotor.
The method is used as a core method of the technical scheme, the influence of environmental factors on circuit monitoring data and the characteristics of rotor materials are considered, the self interference of the circuit is reduced, the actual current of the motor is zero or very close to zero as a temperature calculation reference, at the moment, the voltage drop of the inductance in the power circuit is zero, the voltage of the control circuit is equal to the back electromotive force of the motor, namely, the interference of the inductance or capacitance or other components in the control circuit is avoided, such as electromagnetic interference and other factors are avoided, and when the actual current of the rotor is zero or very close to zero, the torque of the rotor is exactly zero, which represents that the rotor reaches a standard working state, the temperature monitoring and estimation in the state are closely connected with the normal working of the motor, compared with the traditional method, the self factors of the circuit monitoring system are not considered when the temperature of the rotor is calculated, the accuracy of the temperature of the rotor is reduced when calculating it.
When the motor loss-thermal resistance module acquires the motor rotor parameters, although anti-interference components known in the prior art are installed in a circuit, the interference can be reduced, but the interference cannot be completely eliminated, so that when the data acquired by the motor loss-thermal resistance module is in a motor rated state or the rotor reaches a full-load working state, due to influence factors of circuit contents, the accuracy of the acquired data is low, and therefore, a theoretical value is needed for verification, the purpose of verification is that the influence factors of the environment are considered, the temperature of the rotor monitored under the current working condition of the rotor can be better or can reach the actual temperature of the rotor, and when the actual temperature of the rotor is determined, the temperature of the stator corresponding to the temperature of the second magnetic steel can be adopted.
As shown in fig. 6, another aspect provides a temperature distribution measurement system, which is applied to measure the temperature of a rotor of a permanent magnet synchronous motor, where the rotor is made of magnetic steel, and the system includes:
the acquisition module is used for acquiring working parameters of the rotor in a preset working state and determining the temperature of the first magnetic steel; and a process for the preparation of the same,
the device is used for acquiring the actual operation parameters of the permanent magnet synchronous motor and determining the temperature of the second magnetic steel;
and the calculation module is used for determining the temperature of the rotor according to the acquired temperature of the first magnetic steel and the acquired temperature of the second magnetic steel. In the system, the temperature of the rotor in actual operation can be accurately calculated so as to be referred by monitoring personnel and prepare whether to stop working or not.
In the embodiments provided herein, the acquisition module is further configured to,
acquiring a torque value of the current running state of the rotor, judging whether the torque value is zero, if so, acquiring working parameters of the rotor, and determining a flux linkage value of the rotor; and if not, not acquiring the working parameters of the rotor.
In a specific embodiment provided in the present disclosure, the obtaining module is further configured to:
and acquiring data of the flux linkage value changing along with the temperature of the magnetic steel, and determining the temperature of the first magnetic steel according to the determined flux linkage value of the rotor. The flux linkage-magnetic steel thermometer is the existing known data, and is determined by acquiring the data which is convenient for direct monitoring, such as motor voltage or current, and the like through data introduction and calculation.
In a specific embodiment provided in the present disclosure, the obtaining module is further configured to:
acquiring actual operating voltage and current parameters of the permanent magnet synchronous motor, and determining the operating loss of the permanent magnet synchronous motor; and determining the temperature of the second magnetic steel according to the running loss. For example, the operating parameters of the motor rotor under the current working condition, such as voltage or current, are obtained, and the heat loss of the current state is determined through a loss-thermal resistance model.
In embodiments provided herein, the computing module is further configured to:
and judging whether the temperature of the first magnetic steel is equal to the temperature of the first magnetic steel, if so, acquiring the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the temperature of the rotor, otherwise, adjusting the thermal impedance of the permanent magnet synchronous motor until the temperature of the first magnetic steel is the same as the temperature of the second magnetic steel, acquiring the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the temperature of the rotor.
Through adjusting the thermal impedance, adjust to first magnet steel temperature and second magnet steel temperature the same, from simulating out the interference temperature value of influence factor in the circuit to check-up second magnet steel temperature. The method for determining the temperature of the rotor comprises the following steps: the formula for calculating the loss of the rotor temperature is the rotor temperature plus the stator temperature plus the motor loss plus the motor thermal resistance, wherein: the temperature of the stator is actually detected by a detection system, the thermal resistance of the motor is a known value, and the motor loss can be determined according to the existing thermal resistance model, such as the motor running loss obtained by calculating the motor rotating speed, the voltage and the current value.
On the other hand provides a temperature distribution measuring hardware device, is applied to the measurement of PMSM rotor temperature, and the rotor is made by the magnet steel material, includes:
a memory for storing non-transitory computer readable instructions; and
a processor for executing the computer readable instructions and configured to: as shown in figure 5 of the drawings,
determining the temperature of first magnetic steel, wherein the temperature of the first magnetic steel is determined according to the flux linkage value of the rotor; the flux linkage value is determined according to working parameters of the rotor in a preset working state;
determining the temperature of second magnetic steel, wherein the temperature of the second magnetic steel is determined according to the actual operation parameters of the permanent magnet synchronous motor;
and determining the actual temperature of the rotor according to the temperature of the first magnetic steel and the temperature of the second magnetic steel.
Further, the present invention is also applicable to a terminal, such as a mobile phone, a tablet, or an iPad, the terminal comprising a processor, a memory for storing processor executable instructions, wherein the processor is configured to:
determining the temperature of first magnetic steel, wherein the temperature of the first magnetic steel is determined according to the flux linkage value of the rotor; the flux linkage value is determined according to working parameters of the rotor in a preset working state;
determining the temperature of second magnetic steel, wherein the temperature of the second magnetic steel is determined according to the actual operation parameters of the permanent magnet synchronous motor;
and determining the temperature of the rotor according to the temperature of the first magnetic steel and the temperature of the second magnetic steel.
The terminal may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.
A non-transitory computer readable storage medium comprising instructions, such as a memory comprising instructions, executable by a processor of a terminal to perform the above method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
The method and product provided by the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the invention without departing from the inventive concept, and those improvements and modifications also fall within the scope of the claims of the invention.
Claims (10)
1. A temperature distribution measuring method is applied to the temperature measurement of a rotor of a permanent magnet synchronous motor, the rotor is made of magnetic steel materials, and the method is characterized by comprising the following steps:
determining a first magnetic steel temperature, wherein the first magnetic steel temperature is determined according to a flux linkage value of a rotor; the flux linkage value is determined according to working parameters of the rotor in a preset working state;
determining the temperature of second magnetic steel, wherein the temperature of the second magnetic steel is determined according to the actual operation parameters of the permanent magnet synchronous motor;
determining the temperature of the rotor according to the temperature of the first magnetic steel and the temperature of the second magnetic steel, judging whether the temperature of the first magnetic steel is equal to the temperature of the second magnetic steel, if so, obtaining the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the temperature of the rotor, if not, adjusting the thermal impedance and/or the thermal resistance model of the permanent magnet synchronous motor and/or the motor loss model until the temperature of the first magnetic steel is the same as the temperature of the second magnetic steel, obtaining the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the actual temperature of.
2. The method according to claim 1, wherein the determining of the flux linkage value according to the operating parameters of the rotor in a preset operating condition comprises:
acquiring a rotor torque value;
judging whether the torque value is zero, if so, acquiring working parameters of the rotor, and determining a flux linkage value of the rotor; and if not, not acquiring the working parameters of the rotor.
3. The method of claim 2, wherein determining the temperature of the first magnetic steel comprises:
acquiring data of a flux linkage value changing along with the temperature of the magnetic steel;
and determining the temperature of the first magnetic steel according to the determined flux linkage value of the rotor.
4. The method of claim 1, wherein the step of determining the temperature of the second magnetic steel according to the actual operating parameters of the permanent magnet synchronous motor comprises:
acquiring working condition parameters of actual operation of the permanent magnet synchronous motor, and determining the operation loss of the permanent magnet synchronous motor;
and determining the temperature of the second magnetic steel according to the running loss.
5. The utility model provides a system for temperature distribution measurement, is applied to the measurement of PMSM rotor temperature, and the rotor is made by the magnet steel material, its characterized in that, the system includes:
the acquisition module is used for acquiring working parameters of the rotor in a preset working state and determining the temperature of the first magnetic steel; and a process for the preparation of the same,
the device is used for acquiring the actual operation parameters of the permanent magnet synchronous motor and determining the temperature of the second magnetic steel;
and the calculation module is used for determining the temperature of the rotor according to the acquired first magnetic steel temperature and the acquired second magnetic steel temperature, judging whether the first magnetic steel temperature is equal to the second magnetic steel temperature, if so, acquiring the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the temperature of the rotor, otherwise, adjusting the thermal impedance and/or the thermal resistance model of the permanent magnet synchronous motor and/or the motor loss model until the first magnetic steel temperature is the same as the second magnetic steel temperature, acquiring the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the actual temperature of the rotor.
6. The system of claim 5, wherein the acquisition module is further configured to,
acquiring a torque value of a current running state of a rotor, judging whether the torque value is zero or not, if so, acquiring working parameters of the rotor, and determining a flux linkage value of the rotor; and if not, not acquiring the working parameters of the rotor.
7. The system of claim 6, wherein the acquisition module is further configured to:
and acquiring data of the flux linkage value changing along with the temperature of the magnetic steel, and determining the temperature of the first magnetic steel according to the determined flux linkage value of the rotor.
8. The system of claim 7, wherein the acquisition module is further configured to:
acquiring actual operating voltage and current parameters of the permanent magnet synchronous motor, and determining the operating loss of the permanent magnet synchronous motor;
and determining the temperature of the second magnetic steel according to the running loss.
9. The system of claim 8, wherein the computing module is further configured to:
and judging whether the temperature of the first magnetic steel is equal to the temperature of the second magnetic steel, if so, acquiring the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the temperature of the rotor, otherwise, adjusting the thermal impedance and/or the thermal resistance model of the permanent magnet synchronous motor and/or the motor loss model until the temperature of the first magnetic steel is equal to the temperature of the second magnetic steel, acquiring the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the actual temperature of the rotor.
10. The utility model provides a temperature distribution measuring hardware device, is applied to the measurement of PMSM rotor temperature, and the rotor is made by the magnet steel material, its characterized in that includes:
a memory for storing non-transitory computer readable instructions; and
a processor for executing the computer readable instructions and configured to:
determining a first magnetic steel temperature, wherein the first magnetic steel temperature is determined according to a flux linkage value of a rotor; the flux linkage value is determined according to working parameters of the rotor in a preset working state;
determining the temperature of second magnetic steel, wherein the temperature of the second magnetic steel is determined according to the actual operation parameters of the permanent magnet synchronous motor;
and judging whether the temperature of the first magnetic steel is equal to the temperature of the second magnetic steel, if so, acquiring the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the temperature of the rotor, otherwise, adjusting the thermal impedance and/or the thermal resistance model of the permanent magnet synchronous motor and/or the motor loss model until the temperature of the first magnetic steel is equal to the temperature of the second magnetic steel, acquiring the temperature of the stator, the operation loss parameter of the motor and the thermal resistance value of the permanent magnet synchronous motor, and determining the actual temperature of the rotor.
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