CN110635727B - Non-inductive three-phase motor control device and ice chiseling machine - Google Patents
Non-inductive three-phase motor control device and ice chiseling machine Download PDFInfo
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- CN110635727B CN110635727B CN201910998623.5A CN201910998623A CN110635727B CN 110635727 B CN110635727 B CN 110635727B CN 201910998623 A CN201910998623 A CN 201910998623A CN 110635727 B CN110635727 B CN 110635727B
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
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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
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
- H02P6/182—Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings
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Abstract
The invention discloses a non-inductive three-phase motor control device and an ice chiseling machine, wherein the non-inductive three-phase motor control device comprises a power supply circuit, a control chip, an inverter circuit, a back electromotive force detection circuit and a non-inductive three-phase motor; the power supply circuit is respectively connected with the control chip and the inverter circuit, the first output end of the control chip is connected with the input end of the inverter circuit, the output end of the inverter circuit is connected with the input end of the non-inductive three-phase motor, the input end of the counter electromotive force detection circuit is connected with the input end of the non-inductive three-phase motor, and the output end of the counter electromotive force detection circuit is connected with the input end of the control chip; the back electromotive force detection circuit detects the rotor position of the non-inductive three-phase motor and outputs a position detection signal to the control chip; the control chip calculates the conduction phase of the non-inductive three-phase motor; and the inverter circuit drives the non-inductive three-phase motor to operate according to the calculated conduction phase. The technical scheme of the invention improves the operation reliability of the noninductive three-phase motor in the ice chiseling machine.
Description
Technical Field
The invention relates to the technical field of motor control, in particular to an inductionless three-phase motor control device and an ice chiseling machine.
Background
Traditional instrument of making a hole in ice, the instrument of making a hole in ice is mainly manual tool mostly, and the appearance of the machine of making a hole in ice makes people's life convenient and fast more, can reduce a large amount of human costs. However, most ice chisels have the disadvantages of poor start, short service life cycle, insufficient protection function and small running torque in the practical application process, so that the stability and reliability of the ice chisels are reduced. In the current market, with the gradual improvement of the requirements of users on products, the requirements of people cannot be met.
Disclosure of Invention
The invention mainly aims to provide an inductionless three-phase motor control device and an ice chiseling machine, and aims to improve the operation reliability of an inductionless three-phase motor in the ice chiseling machine.
In order to achieve the purpose, the invention provides a non-inductive three-phase motor control device, which comprises a power supply circuit, a control chip, an inverter circuit, a back electromotive force detection circuit and a non-inductive three-phase motor;
the power circuit is respectively connected with the control chip and the inverter circuit, the first output end of the control chip is connected with the input end of the inverter circuit, the output end of the inverter circuit is connected with the input end of the noninductive three-phase motor, the input end of the counter electromotive force detection circuit is connected with the input end of the noninductive three-phase motor, and the output end of the counter electromotive force detection circuit is connected with the input end of the control chip;
the power supply circuit is used for performing power supply conversion on an input alternating current power supply and outputting the converted power supply to the control chip and the inverter circuit respectively;
the back electromotive force detection circuit is used for detecting the rotor position of the non-inductive three-phase motor and outputting a position detection signal to the control chip;
the control chip is used for calculating the conduction phase of the non-inductive three-phase motor according to the position detection signal;
and the inverter circuit is used for driving the non-inductive three-phase motor to operate according to the conduction phase of the non-inductive three-phase motor.
Optionally, the control device of the non-inductive three-phase motor further comprises a sampling circuit, a sampling end of the sampling circuit is connected with a power supply end of the non-inductive three-phase motor, and an output end of the sampling circuit is connected with an ADC input end of the control chip;
the sampling circuit is used for collecting the bus voltage and the bus current of the non-inductive three-phase motor and outputting the bus voltage and the bus current to the control chip;
the control chip is further used for carrying out analog-to-digital conversion on the bus voltage and the bus current input through the ADC input end, comparing the converted bus voltage with a preset voltage, and comparing the converted bus current with a preset current so as to output a control signal to the inverter circuit to drive the non-inductive three-phase motor to operate.
The control chip comprises a reset switch, a start-stop switch and a forward and reverse rotation switch, and is also used for controlling the reset, start-stop and forward and reverse rotation of the non-inductive three-phase motor.
Optionally, the control chip is an inductionless three-phase motor control chip.
Optionally, the back electromotive force detection circuit includes a three-way comparator, and the three-way comparator is configured to determine a conduction phase of the non-inductive three-phase motor, so as to determine a commutation sequence of the non-inductive three-phase motor;
the non-inductive three-phase motor comprises U, V, W phase lines, and the determined reversing sequence of the non-inductive three-phase motor is UV, UW, VW, VU, WU and WV.
Optionally, the back electromotive force detection circuit further includes a switching tube, and the switching tube is configured to control the non-inductive three-phase motor to commutate when detecting that the non-inductive three-phase motor is at a back electromotive force zero crossing point.
Optionally, the switch tube is an NMOS tube.
Optionally, the non-inductive three-phase motor control device further includes a closed-loop control circuit, and the closed-loop control circuit is configured to collect a bus voltage and a bus current output to the inverter circuit by the power supply circuit, and adjust the bus voltage and the bus current to output an adjusted current to the non-inductive three-phase motor.
Optionally, the closed-loop control circuit includes a speed loop PI circuit and a power loop PI circuit, and the speed loop PI circuit and the power loop PI circuit are sequentially connected in sequence.
The invention also provides an ice chiseling machine which comprises the non-inductive three-phase motor control device;
the non-inductive three-phase motor control device comprises a power supply circuit, a control chip, an inverter circuit, a back electromotive force detection circuit and a non-inductive three-phase motor;
the power circuit is respectively connected with the control chip and the inverter circuit, the first output end of the control chip is connected with the input end of the inverter circuit, the output end of the inverter circuit is connected with the input end of the noninductive three-phase motor, the input end of the counter electromotive force detection circuit is connected with the input end of the noninductive three-phase motor, and the output end of the counter electromotive force detection circuit is connected with the input end of the control chip;
the power supply circuit is used for performing power supply conversion on direct current and outputting the converted power supplies to the control chip and the inverter circuit respectively;
the back electromotive force detection circuit is used for detecting the rotor position of the non-inductive three-phase motor and outputting a position detection signal to the control chip;
the control chip is used for calculating the conduction phase of the non-inductive three-phase motor according to the position detection signal;
and the inverter circuit is used for driving the non-inductive three-phase motor to operate according to the conduction phase of the non-inductive three-phase motor.
The technical scheme of the invention is that the non-inductive three-phase motor control device comprises a power supply circuit, a control chip, an inverter circuit, a counter electromotive force detection circuit and a non-inductive three-phase motor, wherein the power supply circuit converts an input alternating current power supply into a direct current power supply to supply power for the control chip and the inverter circuit in the non-inductive three-phase motor control device. The back electromotive force detection circuit detects the position of a rotor of the non-inductive three-phase motor, outputs a position detection signal to the control chip, the control chip calculates the on phase of the non-inductive three-phase motor according to the received position detection signal, outputs six paths of PWM signals to the inverter circuit after calculating the on phase, and the inverter circuit outputs three-phase alternating current according to the received six paths of PWM signals so as to drive the rotor of the non-inductive three-phase motor to rotate according to the reversing sequence of the six paths of PWM signals. The problems of inaccurate position detection of the Hall sensor and noise and vibration caused by high rotating speed and complex working condition of the motor in the related technology are solved through the counter electromotive force detection circuit; meanwhile, the non-inductive three-phase motor conducting phase calculated by the control chip is used for driving the non-inductive three-phase motor to operate, so that the complexity of driving the non-inductive three-phase motor to operate is simplified. The technical scheme of the invention improves the operation reliability of the noninductive three-phase motor in the ice chiseling machine.
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 structures shown in the drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating an embodiment of a control method for an ice chisel according to the present invention;
fig. 2 is a block diagram of an embodiment of a non-inductive FOC controller in the control device of the ice-making machine based on the non-inductive FOC.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
50 | Counter electromotive |
| 20 | |
60 | Speed |
| 30 | |
70 | Power |
| 40 | Non-inductive three-phase motor |
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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 at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides an inductionless three-phase motor control device which is applied to an ice chiseling machine.
In an embodiment of the present invention, as shown in fig. 1, the non-inductive three-phase motor control apparatus includes a power circuit 10, a control chip 20, an inverter circuit 30, a back electromotive force detection circuit 50, and a non-inductive three-phase motor 40;
the power circuit 10 is respectively connected to the control chip 20 and the inverter circuit 30, a first output end of the control chip 20 is connected to an input end of the inverter circuit 30, an output end of the inverter circuit 30 is connected to an input end of the non-inductive three-phase motor 40, an input end of the back electromotive force detection circuit 50 is connected to an input end of the non-inductive three-phase motor 40, and an output end of the back electromotive force detection circuit 50 is connected to an input end of the control chip 20;
the power circuit 10 is configured to perform power conversion on an input ac power source, and output the converted power source to the control chip 20 and the inverter circuit 30, respectively;
the back electromotive force detection circuit 50 is configured to detect a rotor position of the non-inductive three-phase motor 40 and output a position detection signal to the control chip 20;
the control chip 20 is configured to calculate a conduction phase of the non-inductive three-phase motor 40 according to the position detection signal;
the inverter circuit 30 is configured to drive the non-inductive three-phase motor 40 to operate according to the conduction phase of the non-inductive three-phase motor 40.
In this embodiment, for the non-inductive three-phase motor 40 in the non-inductive three-phase motor control device, it can be understood that the non-inductive three-phase motor control device adopts a dc power input, converts the dc power into an ac power through the inverter circuit 30, and has a three-phase ac motor with rotor position feedback, because the mechanical commutator is replaced by the electronic commutator, the brushless dc motor has good speed regulation performance of the dc motor, and has the advantages of simple structure, no commutation spark, reliable operation and easy maintenance of the ac motor.
It should be noted that, in the related art, the brushless dc motor having the hall needs to be matched with the hall sensor, which is relatively complex, and brings adverse factors to the reliability and the manufacturing process of the motor, for example: the installation hall sensor can increase the volume of motor, if the signal transmission line of sensor is more, that causes the interference to the motor very easily, and the operational environment and the temperature of motor reduce hall sensor's reliability, if the installation to hall sensor is inaccurate in addition, can cause the runnability problem of motor.
Aiming at the problems, the Hall-free direct current brushless motor runs stably and is reliable to start, a rotor Hall sensor is not directly used, but a rotor position signal is needed to control the phase change of the motor in the running process of the motor, and the position signal detection of the rotor mostly adopts the detection of stator voltage, current and the like to estimate the position of the rotor. In the scheme, the non-inductive three-phase motor 40 does not have a hall sensor in the non-inductive three-phase motor control device, and the position and speed data of the rotor in the non-inductive three-phase motor 40 are obtained by detecting the voltage, the current and the like of the stator to estimate the position of the rotor, so that the use of the sensor in the non-inductive three-phase motor control device is reduced, and the overall cost of the non-inductive three-phase motor control device applied to the ice chiseling machine is reduced.
In this embodiment, the position of the rotor is estimated by detecting the stator voltage, current, and the like, and the counter electromotive force detection circuit 50 is used to detect the current input to the non-induction three-phase motor 40, thereby obtaining a position signal of the rotor. It can be understood that the back electromotive force detection circuit 50 detects zero-crossing points of back electromotive forces of the phases of the non-inductive three-phase motor 40, so that several key positions of the rotor of the non-inductive three-phase motor 40 can be obtained to realize the phase-change control of the brushless dc motor without hall sensor. Further, the position detection signal is output to the control chip 20 to calculate the conduction phase of the non-inductive three-phase motor 40, after the conduction phase is calculated, the control chip 20 outputs six PWM signals to the inverter circuit 30, and the inverter circuit 30 outputs three-phase alternating current according to the received six PWM signals to drive the rotor of the non-inductive three-phase motor 40 to rotate. Furthermore, the input voltage of the non-inductive three-phase motor 40 is controlled to control the rotation of the rotor of the non-inductive three-phase motor 40, so that the rotation speed of the rotor of the non-inductive three-phase motor 40 can reach the maximum rotation speed which can be reached by mechanical design, the torque of the non-inductive three-phase motor 40 after starting is improved, and the running reliability of the non-inductive three-phase motor 40 is improved.
It can be understood that the position of the rotor can be estimated based on the detection of the stator voltage, the current, etc. of the motor, or a method of back electromotive force third harmonic can be adopted, that is, the filtered third harmonic passes through a voltage zero-crossing comparator, square waves reflecting the phase information of the third harmonic are directly input into an I/O port of a digital signal processing circuit, and a digital phase locking function and accurate estimation of the phase conversion time are realized by software. Thereby realizing commutation control of the non-inductive three-phase motor 40. The position of the rotor of the motor can also be estimated by detecting the on and off states of a freewheeling diode connected in anti-parallel to the power switch tube of the inverter circuit 30. Thereby realizing commutation control of the non-inductive three-phase motor 40.
In this embodiment, the control chip 20 calculates the conduction phase of the non-inductive three-phase motor 40 according to the position detection signal output by the back electromotive force detection circuit 50, that is, the back electromotive force detection circuit 50 detects the current input to the non-inductive three-phase motor 40, estimates the position of the rotor of the non-inductive three-phase motor 40, and outputs the position detection signal to the control chip 20, and the control chip 20 calculates the conduction phase of the non-inductive three-phase motor 40 and outputs six PWM signals to the inverter circuit 30, so as to drive the rotor of the non-inductive three-phase motor 40 to rotate according to the calculated conduction phase. It is understood that the conduction phase calculated by the control chip 20 is six-step control, and in one electrical cycle, the brushless dc motor has only six transition states, or the stator current of the brushless dc motor has six states (i.e. the three-phase bridge arm has six switching states). Each current state can be regarded as a vector moment in one direction, six vectors are regularly converted step by step, the rotation direction of the vectors determines the rotation direction of the brushless direct current motor, the rotation direction of the brushless direct current motor is clockwise or anticlockwise, and the rotor of the brushless direct current motor can rotate synchronously. In the non-inductive three-phase motor control device, a control chip 20 mainly controls two quantities, one is a tube opening state corresponding to the position of a motor rotor, and the position of the brushless direct current motor rotor is obtained through a back electromotive force signal so as to determine the tube opening state; and the second is the control of PWM duty ratio, and the current of the brushless direct current motor is controlled by controlling the size of the duty ratio, thereby controlling the torque and the rotating speed of the brushless direct current motor.
The brushless dc motor in the above embodiment is the three-phase non-inductive motor 40 in this embodiment.
The technical scheme of the invention adopts the non-inductive three-phase motor control device which comprises a power supply circuit 10, a control chip 20, an inverter circuit 30, a counter electromotive force detection circuit 50 and a non-inductive three-phase motor 40, wherein the power supply circuit 10 converts an input alternating current power supply into a direct current power supply to supply power for the control chip 20 and the inverter circuit 30 in the non-inductive three-phase motor control device. The back electromotive force detection circuit 50 detects a position of a rotor of the non-inductive three-phase motor 40 and outputs a position detection signal to the control chip 20, the control chip 20 calculates a conduction phase of the non-inductive three-phase motor 40 according to the received position detection signal, and outputs six PWM signals to the inverter circuit 30 after calculating the conduction phase, and the inverter circuit 30 outputs three-phase alternating current according to the received six PWM signals to drive the rotor of the non-inductive three-phase motor 40 to rotate. The problems of inaccurate position detection of the Hall sensor and noise and vibration caused by high rotating speed and complex working conditions of the motor in the related art are solved through the counter electromotive force detection circuit 50; meanwhile, the non-inductive three-phase motor 40 is driven to operate by the conduction phase of the non-inductive three-phase motor 40 calculated by the control chip 20, so that the complexity of driving the non-inductive three-phase motor 40 to operate is simplified. The technical scheme of the invention improves the operation reliability of the noninductive three-phase motor 40 in the ice chiseling machine.
In one embodiment, the non-inductive three-phase motor control device further comprises a sampling circuit, a sampling end of the sampling circuit is connected with a power supply end of the non-inductive three-phase motor 40, and an output end of the sampling circuit is connected with an ADC input end of the control chip 20;
the sampling circuit is used for collecting the bus voltage and the bus current of the non-inductive three-phase motor 40 and outputting the bus voltage and the bus current to the control chip 20;
the control chip 20 is further configured to perform analog-to-digital conversion on the bus voltage and the bus current input through the ADC input end, compare the converted bus voltage with a preset voltage, and compare the converted bus current with a preset current, so as to output a control signal to the inverter circuit 30 to drive the non-inductive three-phase motor 40 to operate.
In this embodiment, the input bus voltage and the bus current of the power supply end of the non-inductive three-phase motor 40 collected by the sampling circuit are output to the ADC input end of the control chip 20, and are subjected to analog-to-digital conversion, so as to compare the converted bus voltage with the preset voltage, and compare the converted bus current with the preset current. When the converted bus voltage is greater than the preset voltage, the non-inductive three-phase motor control device enters an overvoltage protection state; or when the converted bus current is greater than the preset current, the non-inductive three-phase motor control device enters an overcurrent protection state. And when the non-inductive three-phase motor control device enters an overvoltage protection state or an overcurrent protection state, controlling the non-inductive three-phase motor 40 to stop.
It should be noted that the control device of the non-inductive three-phase motor further has over-temperature protection, under-voltage protection, locked rotor protection and the like, so as to guarantee the service life of the non-inductive three-phase motor 40 and the use safety of users.
In an embodiment, the control chip 20 includes a reset switch, a start-stop switch, and a forward/reverse rotation switch, and the control chip 20 is further configured to control the reset, start-stop, and forward/reverse rotation of the non-inductive three-phase motor 40. It is understood that the reset switch on the control chip 20 is operated to control the restart of the non-inductive three-phase motor 40; the start and stop of the non-inductive three-phase motor 40 are controlled by operating a start-stop switch on the control chip 20; the positive rotation and the negative rotation of the rotor of the non-inductive three-phase motor 40 are controlled by operating a positive and negative rotation switch on the control chip 20. Based on this, when the non-inductive three-phase motor 40 has a fault, the reset, stop and the like can be controlled; when the fault is repaired, the starting, the positive and negative rotation and the like of the non-inductive three-phase motor 40 can be realized; thereby improving the reliability of the operation of the non-inductive three-phase motor 40.
In the above embodiment, the control chip 20 is the non-inductive three-phase motor 40 control chip 20, and may be a PIC18FXX31 series control chip 20, such as PIC18F2331, PIC18F2431, PIC18F4331, and the like, which is not limited herein.
In one embodiment, the back electromotive force detection circuit 50 includes a three-way comparator, and the three-way comparator is configured to determine a conducting phase of the non-inductive three-phase motor 40 to determine a commutation sequence of the non-inductive three-phase motor 40.
The non-inductive three-phase motor 40 comprises U, V, W phase lines, and the determined reversing sequence of the non-inductive three-phase motor 40 is UV, UW, VW, VU, WU and WV.
In this embodiment, the back electromotive force detection circuit 50 further includes a switch tube, and the switch tube is configured to control the non-inductive three-phase motor 40 to commutate when the back electromotive force zero-crossing point of the non-inductive three-phase motor 40 is detected.
It can be understood that in the present embodiment, the back electromotive force detection circuit 50 is used to detect the zero voltage crossing point of the non-inductive three-phase motor 40, and the three-way comparator is used to determine which two phases are turned on at this time, and then determine the phase sequence of the next turn-on phase, and control the switching tube to control the phase change of the non-inductive three-phase motor 40. The three-way comparator is equivalent to having 3 comparators in the back electromotive force detection circuit 50, and determining the six-way commutation sequence of the non-inductive three-phase motor 40 by comparing the 3 comparators in pairs. Further, the three-phase non-inductive motor 40 has U, V, W three phases, and the corresponding six-step phase-changing sequence is: the first step is that the U-phase upper bridge is communicated with the V-phase lower bridge, and the rest is done in the same way, the second step is that the U-phase upper bridge and the W-phase lower bridge, the third step is that the V-phase upper bridge and the W-phase lower bridge, the fourth step is that the V-phase upper bridge and the U-phase lower bridge, the fifth step is that the W-phase upper bridge and the U-phase lower bridge are communicated, and the sixth step is that the W-phase upper bridge and the V-phase lower bridge are communicated. Namely, the six-step commutation sequence of the non-induction three-phase motor 40 is UV, UW, VW, VU, WU, WV.
In this embodiment, the switch tube is an NMOS tube. It can be understood that the back electromotive force detection circuit 50 detects the zero crossing point of the voltage of the non-inductive three-phase motor 40, and after the conduction phase sequence of the non-inductive three-phase motor 40 is determined, the NMOS transistor is controlled to control the commutation of the non-inductive three-phase motor 40.
In an embodiment, as shown in fig. 2, the non-inductive three-phase motor control device further includes a closed-loop control circuit, and the closed-loop control circuit is configured to collect the bus voltage and the bus current output by the power circuit 10 to the inverter circuit 30, and adjust the bus voltage and the bus current to output an adjusted current to the non-inductive three-phase motor 40. Further, the closed-loop control circuit comprises a speed loop PI circuit 60 and a power loop PI circuit 70, and the speed loop PI circuit 60 and the power loop PI circuit 70 are sequentially connected in sequence.
In this embodiment, the speed is given to the first end of the speed loop PI circuit 60, the second end of the speed loop PI circuit 60 is connected to the first end of the power loop PI circuit 70, and the second end of the power loop PI/PR circuit is connected to the input end of the non-inductive three-phase motor 40, so as to control the non-inductive three-phase motor 40 to maintain a certain current, speed or power during the operation.
In this embodiment, the difference value obtained by comparing the input value of the speed loop with the preset speed value is output to the current loop after PID adjustment processing is performed on the speed loop. Note that the PID adjustments are mainly proportional gain and integral, and the speed loop PI circuit 60 includes a speed loop and a current loop. The speed loop series connection correcting device comprises an integral link, so that static errors caused by motor dead zones and power amplifier drifting are overcome, static precision indexes are guaranteed, and static rigidity of the control device is improved. The difference value obtained by comparing the input value of the power loop with the preset power value is output after PID adjustment processing is performed on the power loop, so as to control the output value of the non-inductive three-phase motor 40, so that the non-inductive three-phase motor 40 keeps a certain current, speed or power during the operation process, and the reliability of the non-inductive three-phase motor 40 is improved.
In addition, in order to solve the above problems, the invention further provides an ice chiseling machine, where the ice chiseling machine includes the ice chiseling machine motor control device based on the noninductive FOC, and since the ice chiseling machine adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here. It can be understood that the non-inductive three-phase motor control device in the scheme can also be applied to ice drills, earth boring machines and the like, and the method is not limited here.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A non-inductive three-phase motor control device is applied to an ice chiseling machine and is characterized by comprising a power supply circuit, a control chip, an inverter circuit, a back electromotive force detection circuit and a non-inductive three-phase motor;
the power circuit is respectively connected with the control chip and the inverter circuit, the first output end of the control chip is connected with the input end of the inverter circuit, the output end of the inverter circuit is connected with the input end of the noninductive three-phase motor, the input end of the counter electromotive force detection circuit is connected with the input end of the noninductive three-phase motor, and the output end of the counter electromotive force detection circuit is connected with the input end of the control chip;
after the non-inductive three-phase motor in the ice chiseling machine is started, the power circuit is used for performing power conversion on an input alternating current power supply and outputting the converted power supply to the control chip and the inverter circuit respectively;
the back electromotive force detection circuit is used for detecting current input by the non-inductive three-phase motor to obtain the rotor position of the non-inductive three-phase motor and outputting a position detection signal corresponding to the rotor position of the non-inductive three-phase motor to the control chip; the back electromotive force detection circuit comprises three comparators and a switching tube; the three-way comparator is used for judging the conduction phase of the non-inductive three-phase motor so as to determine the reversing sequence of the non-inductive three-phase motor; the non-inductive three-phase motor comprises U, V, W phase lines, and the determined reversing sequence of the non-inductive three-phase motor is UV, UW, VW, VU, WU and WV; the switching tube is used for controlling the non-inductive three-phase motor to commutate when detecting that the non-inductive three-phase motor is at a back electromotive force zero crossing point;
the control chip is used for calculating the conduction phase of the non-inductive three-phase motor according to the position detection signal;
the inverter circuit is used for driving the non-inductive three-phase motor to operate according to the conducting phase of the non-inductive three-phase motor;
the non-inductive three-phase motor control device also comprises a closed-loop control circuit, wherein the closed-loop control circuit is used for acquiring the bus voltage and the bus current output to the inverter circuit by the power circuit, and adjusting the bus voltage and the bus current so as to output the adjusted current to the non-inductive three-phase motor;
the closed-loop control circuit comprises a speed loop PI circuit and a power loop PI circuit, and the speed loop PI circuit and the power loop PI circuit are sequentially connected; the speed loop PI circuit comprises a speed loop and a current loop, wherein the speed loop is used for outputting a difference value obtained after comparing a speed loop input value with a preset speed value to the current loop after PID adjustment processing, so that the difference value is converted into a power loop input value through the current loop, and the power loop PI circuit is used for outputting the difference value obtained after comparing the power loop input value with a preset power value after PID adjustment processing.
2. The noninductive three-phase motor control device of claim 1 further comprising a sampling circuit, wherein a sampling terminal of the sampling circuit is connected with a power supply terminal of the noninductive three-phase motor, and an output terminal of the sampling circuit is connected with an ADC input terminal of the control chip;
the sampling circuit is used for collecting the bus voltage and the bus current of the non-inductive three-phase motor and outputting the bus voltage and the bus current to the control chip;
the control chip is further used for carrying out analog-to-digital conversion on the bus voltage and the bus current input through the ADC input end, comparing the converted bus voltage with a preset voltage, and comparing the converted bus current with a preset current so as to output a control signal to the inverter circuit to drive the non-inductive three-phase motor to operate.
3. The control device of the non-inductive three-phase motor according to claim 1, wherein the control chip comprises a reset switch, a start-stop switch and a forward and reverse rotation switch, and the control chip is further used for controlling the reset, start-stop and forward and reverse rotation of the non-inductive three-phase motor.
4. An inductionless three-phase motor control apparatus as claimed in any one of claims 1 to 3, wherein said control chip is an inductionless three-phase motor control chip.
5. The control device of the non-inductive three-phase motor of claim 1, wherein the switch tube is an NMOS tube.
6. An ice chisel machine, characterized in that it comprises an inductorless three-phase motor control as claimed in any one of claims 1 to 5.
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