CN116667710A - Motor control method, motor control device, electronic equipment and storage medium - Google Patents

Abstract

The application provides a motor control method, a motor control device, electronic equipment and a storage medium, wherein the motor control method comprises the following steps: acquiring a reactive current average value of a permanent magnet synchronous motor; driving the permanent magnet synchronous motor to operate by a first output voltage corresponding to a target frequency; detecting a first passive current value in the running process of the permanent magnet synchronous motor; and according to the first reactive current value and the reactive current average value, regulating the first output voltage to obtain a second output voltage, and driving the permanent magnet synchronous motor to run by using the second output voltage. The motor control method provided by the scheme can prevent the permanent magnet synchronous motor from losing step, and the permanent magnet synchronous motor has higher stability in running.

Description

Motor control method, device, electronic device and storage medium

technical field

The present application relates to the technical field of electrical control, and in particular to a motor control method, device, electronic equipment and storage medium.

Background technique

The permanent magnet synchronous motor has the advantages of high power efficiency, high power factor and small size, and the moment of inertia of the permanent magnet synchronous motor is small, and the allowable pulse torque is large, so it can obtain higher acceleration and the dynamic performance of the permanent magnet synchronous motor Excellent, compact structure, high operational reliability, simple structure and easy maintenance, so permanent magnet synchronous motors are widely used in production and life.

At present, the frequency converter uses the vector control method or the programmable V/F control method to drive the permanent magnet synchronous motor.

However, the cost of driving the permanent magnet synchronous motor with the vector control method is relatively high, and when the programmable V/F control method is used, due to the large number of types of permanent magnet synchronous motors and loads, it is difficult to debug, and it is easy to adjust when the load changes. The permanent magnet synchronous motor is caused to be out of step, and the stability of the permanent magnet synchronous motor is poor, so the existing motor control method has low practicability.

Contents of the invention

In view of this, the motor control method, device, electronic equipment and storage medium provided by the present application can prevent the out-of-step of the permanent magnet synchronous motor, so it has high practicability.

According to the first aspect of the embodiments of the present application, there is provided a motor control method, including: obtaining the average value of the reactive current of the permanent magnet synchronous motor; driving the permanent magnet synchronous motor with a first output voltage corresponding to the target frequency running; detecting the first reactive current value during the operation of the permanent magnet synchronous motor; adjusting the first output voltage to obtain the second reactive current value according to the first reactive current value and the reactive current average value output voltage, and drive the permanent magnet synchronous motor to run with the second output voltage.

In a possible implementation manner, the obtaining the average reactive current of the permanent magnet synchronous motor includes: obtaining the rated operating frequency of the permanent magnet synchronous motor; controlling the permanent magnet synchronous motor to run at a first frequency, Wherein, the ratio of the first frequency to the rated operating frequency is a preset ratio threshold, and the ratio threshold is less than or equal to 1; the reactive current of the permanent magnet synchronous motor is detected, and at least two second reactive currents are obtained. a reactive current value; determining an average value of the at least two second reactive current values as the reactive current average value.

In a possible implementation manner, the ratio threshold is 1/2.

In a possible implementation manner, the driving the permanent magnet synchronous motor to run with the first output voltage corresponding to the target frequency includes: obtaining the rated back EMF voltage of the permanent magnet synchronous motor; The linear relationship between the operating frequency and the rated back EMF voltage determines the first output voltage corresponding to the target frequency; the permanent magnet synchronous motor is driven to run with the first output voltage, wherein the first An output voltage less than or equal to the rated back EMF voltage.

In a possible implementation manner, according to the first reactive current value and the reactive current average value, the first output voltage is adjusted to obtain a second output voltage, and the second The output voltage drives the permanent magnet synchronous motor to run, including: if the difference between the first reactive current value and the reactive current average value is within a preset fluctuation range, determining the first output voltage is the second output voltage, and drives the permanent magnet synchronous motor to run with the second output voltage.

In a possible implementation manner, according to the first reactive current value and the reactive current average value, the first output voltage is adjusted to obtain a second output voltage, and the second The output voltage drives the permanent magnet synchronous motor to run, including: if the difference between the first reactive current value and the reactive current average value is greater than a first threshold, then reduce the first output voltage to obtain the second output voltage, and drive the permanent magnet synchronous motor to run with the second output voltage.

In a possible implementation manner, according to the first reactive current value and the reactive current average value, the first output voltage is adjusted to obtain a second output voltage, and the second The output voltage drives the permanent magnet synchronous motor to run, including: if the difference between the first reactive current value and the reactive current average value is less than a second threshold, increasing the first output voltage to obtain the The second output voltage is used to drive the permanent magnet synchronous motor to run.

According to the second aspect of the embodiment of the present application, there is provided a motor control device, including: an acquisition unit, used to acquire the average reactive current value of the permanent magnet synchronous motor; a first drive unit, used to correspond to the target frequency The first output voltage of the permanent magnet synchronous motor is used to drive the operation of the permanent magnet synchronous motor; the detection unit is used to detect the first reactive current value during the operation of the permanent magnet synchronous motor; The active current value and the reactive current average value are adjusted to obtain a second output voltage by adjusting the first output voltage, and the permanent magnet synchronous motor is driven to run by the second output voltage.

According to a third aspect of the embodiments of the present application, there is provided an electronic device, including: a processor, a communication interface, a memory, and a communication bus, and the processor, the memory, and the communication interface complete mutual communication through the communication bus. The communication among them; the memory is used to store at least one executable instruction, and the executable instruction causes the processor to execute the operation corresponding to the motor control method provided in the first aspect above.

According to a fourth aspect of the embodiments of the present application, there is provided a computer-readable storage medium, the computer-readable storage medium stores computer instructions, and when the computer instructions are executed by a processor, the processor executes Operations corresponding to the motor control method provided in the first aspect above.

According to a fifth aspect of the embodiments of the present application, a computer program product is provided, the computer program product is tangibly stored on a computer-readable medium and includes computer-executable instructions, and when executed, the computer-executable instructions Make at least one processor execute the motor control method provided in the first aspect or any possible implementation manner of the first aspect.

According to the above technical solution, the permanent magnet synchronous motor is driven to run with the first output voltage, thereby realizing independent voltage control of the permanent magnet synchronous motor, and can more accurately control the permanent magnet synchronous motor to run at the target frequency, and according to the permanent magnet synchronous The detected first reactive current and the obtained average value of the reactive current during the operation of the motor can adjust the first output voltage, so that the driving voltage of the permanent magnet synchronous motor can be adjusted to make the work of the permanent magnet synchronous motor more stable , because the non-vector control method is used to drive the permanent magnet synchronous motor, the cost is low, and when the load changes, the output voltage can be automatically changed according to the reactive current value generated by the permanent magnet synchronous motor, that is, the driving voltage of the permanent magnet synchronous motor , so the permanent magnet synchronous motor can be prevented from out of step, and the stability is high, so the practicability of the motor control method is high.

Description of drawings

FIG. 1 is a flowchart of a motor control method provided in an embodiment of the present application;

Fig. 2 is a flow chart of a method for obtaining an average value of reactive current provided by an embodiment of the present application;

Fig. 3 is a flow chart of another motor control method provided by the embodiment of the present application;

Fig. 4 is a schematic diagram of a motor control device provided by an embodiment of the present application;

Fig. 5 is a schematic diagram of an electronic device provided by an embodiment of the present application.

List of reference signs:

101: Get the average reactive current of the permanent magnet synchronous motor

102: Drive the permanent magnet synchronous motor to run with the first output voltage corresponding to the target frequency

103: Detect the first reactive current value during the operation of the permanent magnet synchronous motor

104: According to the first reactive current value and reactive current average value, adjust the first output voltage to obtain the second output voltage, and drive the permanent magnet synchronous motor to run with the second output voltage

201: Obtain the rated operating frequency of the permanent magnet synchronous motor

202: Control the permanent magnet synchronous motor to run at the first frequency

203: Detect the reactive current of the permanent magnet synchronous motor, and obtain at least two second reactive current values

204: Determine the average value of at least two second reactive current values as the average reactive current value

301: Calculate the difference between the first reactive current value and the average reactive current value

302: Determine whether the difference between the first reactive current value and the average reactive current value is greater than the first threshold

303: Reduce the first output voltage to obtain the second output voltage, and drive the permanent magnet synchronous motor to run with the second output voltage 304: Determine whether the difference between the first reactive current value and the average reactive current value is less than the second threshold

305: Increase the first output voltage to obtain the second output voltage, and drive the permanent magnet synchronous motor to run with the second output voltage 100: Motor control method 200: Reactive current average value acquisition method 300: Another motor control method

401: acquisition unit 402: first drive unit 403: detection unit

404: Second drive unit 500: Electronics 502: Processor

504: Communication interface 506: Memory 508: Communication bus

510: Program 400: Motor Control Unit

Detailed ways

As mentioned above, the permanent magnet synchronous motor has the advantages of high power efficiency, high power factor and small size, and the moment of inertia of the permanent magnet synchronous motor is small, and the allowable pulse torque is large, so a higher acceleration can be obtained. Synchronous motors have good dynamic performance, compact structure, and high operational reliability. At the same time, permanent magnet synchronous motors have a simple structure and are easy to maintain. Therefore, permanent magnet synchronous motors are widely used in production and life. At present, frequency converters use vector control or programmable V/F control to drive permanent magnet synchronous motors. However, for fan and water pump loads with square torque load characteristics, a large number of vector The cost of driving the permanent magnet synchronous motor is relatively high, and when the programmable V/F control method is used to drive the permanent magnet synchronous motor, since the programmable V/F control method is the minimum current method, that is, to find the voltage at the best operating point value, and determine a V/F curve between voltage and frequency according to the voltage value of the best working point, and drive the permanent magnet synchronous motor through the V/F curve, but this method has the following disadvantages: when the load changes, The optimum working point has also changed. Using the original V/F curve to drive the permanent magnet synchronous motor will easily cause the permanent magnet synchronous motor to lose step, the stability of the permanent magnet synchronous motor is poor, and the debugging is difficult and takes a long time. Therefore, the existing The permanent magnet synchronous motor control method is less practical.

In the embodiment of the present application, the permanent magnet synchronous motor is driven to run with the first output voltage, so that the independent voltage control of the permanent magnet synchronous motor can be realized, and the permanent magnet synchronous motor can be more accurately controlled to run at the target frequency, and according to the permanent magnet synchronous motor The detected first reactive current and the obtained average value of the reactive current during the operation of the magnetic synchronous motor can adjust the first output voltage, so that the driving voltage of the permanent magnet synchronous motor can be adjusted to make the permanent magnet synchronous motor work More stable, since the permanent magnet synchronous motor is driven by non-vector control, the cost is low, and when the load changes, the output voltage can be automatically changed according to the reactive current value generated by the permanent magnet synchronous motor, that is, the permanent magnet synchronous motor The driving voltage can prevent the permanent magnet synchronous motor from out of step, and the stability is high, so the practicability of the motor control method is high.

The motor control method, device and electronic equipment provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a flow chart of a motor control method provided in an embodiment of the present application. As shown in FIG. 1 , the motor control method 100 includes the following steps 101 to 104:

Step 101. Acquire the average reactive current of the permanent magnet synchronous motor.

Obtains the average value of the reactive current of the permanent magnet synchronous motor connected to the frequency converter.

Optionally, it can be judged whether the permanent magnet synchronous motor has pre-calculated the average value of the reactive current, if so, obtain the pre-calculated average value of the reactive current, if not, calculate the average value of the reactive current of the permanent magnet synchronous motor , and obtain the calculated average value of reactive current, wherein the average value of reactive current can be calculated by calculation methods such as integral calculation method and average value method, and the specific calculation method is not limited in this embodiment of the application.

Step 102, drive the permanent magnet synchronous motor to run with the first output voltage corresponding to the target frequency.

The target frequency is the operating frequency of the preset permanent magnet synchronous motor, that is, the permanent magnet synchronous motor needs to run at the target frequency. The output voltage controls the operation of the permanent magnet synchronous motor.

The frequency converter determines the first output voltage corresponding to the target frequency, and drives the permanent magnet synchronous motor to run through the first output voltage, so that the permanent magnet synchronous motor runs at the target frequency.

Step 103, detecting the first reactive current value during the operation of the permanent magnet synchronous motor.

To detect the first reactive current value generated by the permanent magnet synchronous motor during operation, specifically, the drive current during the operation of the permanent magnet synchronous motor can be decomposed into two orthogonally in terms of the first output voltage phase angle Current components, one of which is in phase with the voltage, and the other current component is at a 90° phase angle to the voltage, the current component in phase with the voltage is the active current, and the current component at a 90° phase angle to the voltage is the reactive current, To read the first reactive current value of the reactive current, it should be understood that the above is only an example of a method for detecting reactive current, and should not be used as any limitation to the method for detecting reactive current in this embodiment of the present application.

Step 104: Adjust the first output voltage to obtain a second output voltage according to the first reactive current value and the average reactive current value, and drive the permanent magnet synchronous motor to run with the second output voltage.

According to the first reactive current value and reactive current average value, the first output voltage is adjusted, the adjustment process includes increasing the first output voltage, reducing the first output voltage and maintaining the first output voltage, and according to the adjusted The second output voltage drives the permanent magnet synchronous motor to run.

It should be noted that the process of adjusting the first output voltage is a dynamic adjustment process, that is, after the permanent magnet synchronous motor is driven with the second output voltage, step 103 is re-executed to detect the first reactive power during the operation of the permanent magnet synchronous motor current value, and adjust the second output voltage according to the new first reactive current and reactive current average value, and repeat this process.

In the embodiment of the present application, the permanent magnet synchronous motor is driven to run with the first output voltage, so that the independent voltage control of the permanent magnet synchronous motor can be realized, and the permanent magnet synchronous motor can be more accurately controlled to run at the target frequency, and according to the permanent magnet synchronous motor The detected first reactive current and the obtained average value of the reactive current during the operation of the magnetic synchronous motor can adjust the first output voltage, so that the driving voltage of the permanent magnet synchronous motor can be adjusted to make the permanent magnet synchronous motor work More stable, since the permanent magnet synchronous motor is driven by non-vector control, the cost is low, and when the load changes, the output voltage can be automatically changed according to the reactive current value generated by the permanent magnet synchronous motor, that is, the permanent magnet synchronous motor The driving voltage can prevent the permanent magnet synchronous motor from out of step, and the stability is high, so the practicability of the motor control method is high.

Fig. 2 is a flowchart of a method for obtaining an average value of reactive current provided by an embodiment of the present application. As shown in Fig. 2, when obtaining an average value of reactive current of a permanent magnet synchronous motor, the following steps 201 to 204 can be performed :

Step 201, obtain the rated operating frequency of the permanent magnet synchronous motor.

Obtain the rated operating frequency of the permanent magnet synchronous motor. The rated operating frequency is recorded on the motor nameplate. The rated operating frequency recorded on the nameplate can be manually input. It should be noted that when the rated operating frequency of the permanent magnet synchronous motor is not recorded on the frequency, the rated speed of the permanent magnet synchronous motor can be obtained, and the rated operating frequency of the permanent magnet synchronous motor can be calculated according to the formula n=60f/p, where n is used to represent the rated speed of the permanent magnet synchronous motor, and f is used to represent the permanent magnet synchronous motor The rated operating frequency of the magnetic synchronous motor, p is used to characterize the number of pole pairs of the rotating magnetic field in the permanent magnet synchronous motor.

Step 202, controlling the permanent magnet synchronous motor to run at the first frequency.

Control the permanent magnet synchronous motor to run at the first frequency. In the embodiment of the present application, the V/F control method is used to drive the permanent magnet synchronous motor to run at the first frequency, wherein the ratio of the first frequency to the rated operating frequency is preset Ratio threshold, the ratio threshold is less than or equal to 1, for example: the ratio threshold can be 1/4, that is, the first frequency is 1/4 of the rated frequency, when the ratio threshold is 1, the permanent magnet synchronous motor is driven at the rated frequency run.

Step 203 , detecting the reactive current of the permanent magnet synchronous motor to obtain at least two second reactive current values.

When the permanent magnet synchronous motor reaches the first frequency and runs stably at the first frequency, detect the reactive current of the permanent magnet synchronous motor at least twice at this time, and obtain at least two reactive current values.

Step 204. Determine the average value of at least two second reactive current values as the average reactive current value.

Calculate the average value of at least two second reactive current values. In the embodiment of the present application, various calculation methods can be used to calculate the average value. For example, if there is a second reactive current 1 and a second reactive current 2, then according to the following The formula (the second reactive current 1+the second reactive current 2)/2 calculates the average value, or calculates the average value by the geometric mean value calculation method and so on.

The calculated average value of the at least two second reactive currents is determined as the average value of the reactive current, and the average value of the reactive current is recorded.

In the embodiment of the present application, the permanent magnet synchronous motor is controlled to run at the first frequency, the second reactive current generated during the operation of the permanent magnet synchronous motor is detected multiple times, and the average value of the second reactive current is determined as the reactive power The average value of the current, so that the average value of the reactive current can be obtained, and since the average value of the reactive current is the average value of multiple reactive currents generated when running at a fixed frequency, the average value of the reactive current is more It is accurate and has high reference significance, so that when the first output voltage is adjusted according to the average reactive current value and the first reactive current value, the operation of the permanent magnet synchronous motor can be made more stable, so the practicability is high.

In a possible implementation manner, the ratio threshold is 1/2.

In the embodiment of the present application, the ratio between the first frequency and the rated operating frequency is 1:2, that is, the operation of the permanent magnet synchronous motor is controlled at 1/2 of the rated frequency. The average value of reactive current calculated by the second reactive current has more reference significance, and the accuracy of the average value of reactive current is higher.

In a possible implementation, when the permanent magnet synchronous motor is driven to run with the first output voltage corresponding to the target frequency, the rated back EMF voltage of the permanent magnet synchronous motor can be obtained, and then according to the rated operating frequency and the rated back EMF The linear relationship between the voltages determines the first output voltage corresponding to the target frequency, and drives the permanent magnet synchronous motor to run with the first output voltage, wherein the first output voltage is less than or equal to the rated back EMF voltage.

Obtain the rated back EMF voltage of the permanent magnet synchronous motor. Specifically, the rated back EMF voltage of the permanent magnet synchronous motor can be automatically calculated according to the nameplate data of the permanent magnet synchronous motor input into the inverter. At this time, the rated back EMF voltage is the permanent magnet synchronous motor The rated input voltage of the synchronous motor.

According to the linear relationship between the rated operating frequency and the rated back EMF voltage, determine the first output voltage corresponding to the target frequency. Since the rated operating frequency and the rated back EMF voltage are linearly related, specifically proportional, the rated operating frequency and The ratio of the rated back EMF voltage is a fixed constant. For example, if the rated operating frequency is 50Hz and the rated back EMF voltage is 300V, if the target frequency is 10Hz at this time, the input voltage of the permanent magnet synchronous motor is 60V, that is, the inverter’s The first output voltage is 60V.

Since the input voltage of the permanent magnet synchronous motor exceeds the rated back EMF voltage, it is easy to cause damage to the permanent magnet synchronous motor, so the target frequency is less than or equal to the rated operating frequency, and the input voltage of the permanent magnet synchronous motor is less than or equal to the rated back EMF voltage. The first output voltage is less than or equal to the rated back EMF voltage.

In the embodiment of the present application, according to the linear relationship between the rated back EMF voltage of the permanent magnet synchronous motor and the rated operating frequency, the first output voltage corresponding to the target frequency is determined, and the permanent magnet synchronous motor is driven to run by the first output voltage, In this way, the permanent magnet synchronous motor can be operated at the target frequency. Since the permanent magnet synchronous motor is driven by controlling the first output voltage, an independent voltage control method is used to control the permanent magnet synchronous motor. Compared with the V/F control method, the permanent magnet synchronous motor is driven The motor has high control precision.

Fig. 3 is a flowchart of another motor control method provided by the embodiment of the present application. As shown in Fig. 3, on the basis of steps 101 to 104 shown in Fig. 1, step 104 includes the following steps 301 to 303:

Step 301. Calculate the difference between the first reactive current value and the average reactive current value.

Step 302 , judging whether the difference between the first reactive current value and the average value of the reactive current is greater than the first threshold, if yes, execute step 303 , if not N, execute step 304 .

Step 303 , reduce the first output voltage to obtain a second output voltage, and drive the permanent magnet synchronous motor to run with the second output voltage, and execute step 103 .

When the difference between the first reactive current value and the average value of the reactive current is greater than the first threshold, the first output voltage is reduced, thereby reducing the input voltage and input current of the permanent magnet synchronous motor to obtain after reducing the first output voltage The second output voltage of the permanent magnet synchronous motor is driven to run, and step 103 is re-executed to detect the first reactive current value during the operation of the permanent magnet synchronous motor, so as to re-execute steps 301 to 303, and this cycle.

Step 304 , judging whether the difference between the first reactive current value and the average value of the reactive current is smaller than the second threshold, if yes, execute step 305 , if not N, execute step 103 .

Step 305 , increase the first output voltage to obtain a second output voltage, and drive the permanent magnet synchronous motor to run with the second output voltage, and execute step 103 .

When the difference between the first reactive current value and the average reactive current value is less than the second threshold, the first output voltage is increased, so that the input voltage and input current of the permanent magnet synchronous motor can be increased to increase the first output The second output voltage obtained after the voltage is used to drive the permanent magnet synchronous motor to run, and re-execute step 103, detect the first reactive current value during the operation of the permanent magnet synchronous motor, to re-execute steps 301 to 303, and cycle like this .

It should be noted that when the difference between the first reactive current value and the average value of reactive current is less than the first threshold and greater than the second threshold, that is, the difference between the first reactive current value and the average value of reactive current is at Within the preset fluctuation range, the first output voltage is not changed, the first output voltage is determined as the second output voltage, and the second output voltage is used to drive the permanent magnet synchronous motor to run. The fluctuation range is [the first threshold, the second threshold].

The following takes the first threshold as +0.05, the second threshold as -0.05, and the preset fluctuation range as [-0.05,+0.05] as an example to illustrate this embodiment:

When I ₁ <I ₀ -0.05, that is, when I ₁ -I ₀ <-0.05, increase the first output voltage to obtain the second output voltage, and drive the permanent magnet synchronous motor to run with the second output voltage, and retest to The second output voltage drives the first reactive current value generated when the permanent magnet synchronous motor is running, wherein I ₁ is used to represent the first reactive current value, and I ₀ is used to represent the average value of the reactive current.

When I ₁ >I ₀ +0.05, that is, when I ₁ -I ₀ >+0.05, reduce the first output voltage to obtain the second output voltage, and drive the permanent magnet synchronous motor to run with the second output voltage, and retest with the first The second output voltage drives the first reactive current value generated when the permanent magnet synchronous motor is running.

When I ₀ -0.05<I ₁ <I ₀ +0.05, namely -0.05<I ₁ -I ₀ <+0.05, the first output voltage is determined as the second output voltage, and the second output voltage is used to drive the permanent magnet synchronously The motor runs.

It should be understood that the above process is only an example and does not impose any limitation on the present application. The specific first threshold, the second threshold and the preset fluctuation range can be set according to the operation stability requirements of the permanent magnet synchronous motor.

In the embodiment of the present application, according to the difference between the first reactive current value and the average reactive current value, the first output voltage is adjusted to obtain the second output voltage, and the permanent magnet synchronous motor is driven by the second output voltage operation, which can control the permanent magnet synchronous motor to automatically find the best working point, reduce the difficulty of debugging, and when the load changes, the output voltage can be dynamically adjusted to prevent the permanent magnet synchronous motor from out of step caused by the load change, and improve the permanent magnet synchronous The running stability of the motor is high, so the practicability of the motor control method is high.

Fig. 4 is a schematic diagram of a motor control device provided by an embodiment of the present application. As shown in FIG. 4, the motor control device 400 includes:

The acquiring unit 401 is configured to acquire the average value of the reactive current of the permanent magnet synchronous motor.

The first driving unit 402 is configured to drive the permanent magnet synchronous motor to run with the first output voltage corresponding to the target frequency.

The detection unit 403 is configured to detect the first reactive current value during the operation of the permanent magnet synchronous motor.

The second drive unit 404 is configured to adjust the first output voltage to obtain a second output voltage according to the first reactive current value and the average reactive current value, and drive the permanent magnet synchronous motor to run with the second output voltage.

In this embodiment of the present application, the acquisition unit 401 can be used to perform step 101 in the above method embodiment, the first driving unit 402 can be used to perform step 102 in the above method embodiment, and the detection unit 403 can be used to perform the above method embodiment In step 103, the second driving unit 404 may be used to execute step 104 in the above method embodiment.

In a possible implementation manner, the acquisition unit 401 can be used to acquire the rated operating frequency of the permanent magnet synchronous motor; control the permanent magnet synchronous motor to run at the first frequency, wherein the ratio of the first frequency to the rated operating frequency is a preset Set the ratio threshold value, the ratio threshold value is less than or equal to 1; detect the reactive current of the permanent magnet synchronous motor, and obtain at least two second reactive current values; determine the average value of at least two second reactive current values as reactive power current average.

In a possible implementation manner, the ratio threshold is 1/2.

In a possible implementation, the obtaining unit 401 can be used to obtain the rated back EMF voltage of the permanent magnet synchronous motor; according to the linear relationship between the rated operating frequency and the rated back EMF voltage, determine the first output corresponding to the target frequency Voltage: drive the permanent magnet synchronous motor to run with the first output voltage, wherein the first output voltage is less than or equal to the rated back EMF voltage.

In a possible implementation, if the difference between the first reactive current value and the average reactive current value is within a preset fluctuation range, the second drive unit 404 may determine the first output voltage as the second output voltage , and drive the permanent magnet synchronous motor to run with the second output voltage.

In a possible implementation, if the difference between the first reactive current value and the average reactive current value is greater than the first threshold, the second driving unit 404 may reduce the first output voltage to obtain the second output voltage, and use The second output voltage drives the permanent magnet synchronous motor to run.

In a possible implementation manner, if the difference between the first reactive current value and the average reactive current value is smaller than the second threshold, the second driving unit 404 may increase the first output voltage to obtain the second output voltage, and The permanent magnet synchronous motor is driven to run with the second output voltage.

It should be noted that the information exchange and execution process among the various modules in the above-mentioned motor control device are based on the same concept as the above-mentioned embodiment of the motor control method, and the specific content can refer to the description in the above-mentioned embodiment of the motor control method. I won't repeat them here.

FIG. 5 is a schematic diagram of an electronic device provided by an embodiment of the present application, and the specific embodiment of the present application does not limit the specific implementation of the electronic device. Referring to FIG. 5 , an electronic device 500 provided by an embodiment of the present application includes: a processor (processor) 502 , a communication interface (Communications Interface) 504 , a memory (memory) 506 , and a communication bus 508 . in:

The processor 502 , the communication interface 504 , and the memory 506 communicate with each other through the communication bus 508 .

The communication interface 504 is used for communicating with other electronic devices or servers.

The processor 502 is configured to execute the program 510, specifically, may execute relevant steps in any one of the motor control method embodiments described above.

Specifically, the program 510 may include program codes including computer operation instructions.

The processor 502 may be a central processing unit CPU, or an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of the present application. The one or more processors included in the smart device may be of the same type, such as one or more CPUs, or may be different types of processors, such as one or more CPUs and one or more ASICs.

The memory 506 is used for storing the program 510 . The memory 506 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

The program 510 can be specifically used to make the processor 502 execute the motor control method in any of the foregoing embodiments.

For the specific implementation of each step in the program 510, reference may be made to the corresponding descriptions in the corresponding steps and units in any of the aforementioned embodiments of the motor control method, and details are not repeated here. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the above-described devices and modules can refer to the corresponding process description in the foregoing method embodiments, and details are not repeated here.

Through the electronic device of the embodiment of the present application, the permanent magnet synchronous motor is driven to run with the first output voltage, thereby realizing independent voltage control of the permanent magnet synchronous motor, and more accurately controlling the permanent magnet synchronous motor to run at the target frequency, and According to the detected first reactive current and the obtained average value of the reactive current during the operation of the permanent magnet synchronous motor, the first output voltage is adjusted, so that the driving voltage of the permanent magnet synchronous motor can be adjusted to make the permanent magnet synchronous motor The work is more stable, because the non-vector control method is used to drive the permanent magnet synchronous motor, so the cost is low, and when the load changes, the output voltage can be automatically changed according to the reactive current value generated by the permanent magnet synchronous motor, that is, the permanent magnet synchronous The driving voltage of the motor can prevent the out-of-step of the permanent magnet synchronous motor, and the stability is high, so the practicability of the motor control method is high.

An embodiment of the present application also provides a computer-readable storage medium storing instructions for enabling a machine to execute the motor control method described herein. Specifically, a system or device equipped with a storage medium may be provided, on which a software program code for realizing the functions of any of the above embodiments is stored, and the computer (or CPU or MPU of the system or device) ) to read and execute the program code stored in the storage medium.

In this case, the program code itself read from the storage medium can realize the function of any one of the above-mentioned embodiments, so the program code and the storage medium storing the program code constitute a part of the present application.

Examples of storage media for providing program code include floppy disks, hard disks, magneto-optical disks, optical disks (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), Tape, non-volatile memory card, and ROM. Alternatively, the program code can be downloaded from a server computer via a communication network.

In addition, it should be clear that not only by executing the program code read by the computer, but also by making the operating system on the computer complete part or all of the actual operations through instructions based on the program code, so as to realize the function of any one of the embodiments.

In addition, it can be understood that the program code read from the storage medium is written into the memory provided in the expansion board inserted into the computer or written into the memory provided in the expansion module connected to the computer, and then based on the program code The instruction causes the CPU installed on the expansion board or the expansion module to perform some or all of the actual operations, thereby realizing the functions of any one of the above-mentioned embodiments.

The embodiment of the present application also provides a computer program product, the computer program product is tangibly stored on a computer-readable medium and includes computer-executable instructions, and the computer-executable instructions cause at least one processor to The motor control methods provided by the above-mentioned embodiments are executed. It should be understood that the solutions in this embodiment have the corresponding technical effects in the foregoing method embodiments, and details are not repeated here.

It should be noted that not all the steps and modules in the above processes and system structure diagrams are necessary, and some steps or modules can be ignored according to actual needs. The execution order of each step is not fixed and can be adjusted as needed. The system structures described in the above embodiments may be physical structures or logical structures, that is, some modules may be realized by the same physical entity, or some modules may be realized by multiple physical entities, or may be realized by multiple Certain components in individual devices are implemented together.

Nouns and pronouns referring to persons in this patent application are not limited to specific genders.

In the above embodiments, the hardware modules may be implemented mechanically or electrically. For example, a hardware module may include permanently dedicated circuitry or logic (such as a dedicated processor, FPGA or ASIC) to perform the corresponding operations. The hardware modules may also include programmable logic or circuits (such as general-purpose processors or other programmable processors), which can be temporarily set by software to complete corresponding operations. The specific implementation (mechanical way, or a dedicated permanent circuit, or a temporary circuit) can be determined based on cost and time considerations.

The above has shown and described the present application in detail through the accompanying drawings and preferred embodiments. However, the present application is not limited to these disclosed embodiments. Those skilled in the art can know that the above-mentioned different embodiments can be combined based on the above-mentioned multiple embodiments. The code auditing means in the present application obtains more embodiments, and these embodiments are also within the protection scope of the present application.

Claims (11)

1. A motor control method (100), characterized by comprising:

acquiring a reactive current average value of a permanent magnet synchronous motor;

driving the permanent magnet synchronous motor to operate by a first output voltage corresponding to a target frequency;

detecting a first passive current value in the running process of the permanent magnet synchronous motor;

and according to the first reactive current value and the reactive current average value, regulating the first output voltage to obtain a second output voltage, and driving the permanent magnet synchronous motor to run by using the second output voltage.

2. The method of claim 1, wherein the obtaining a reactive current average value of the permanent magnet synchronous motor comprises:

acquiring the rated operating frequency of the permanent magnet synchronous motor;

controlling the permanent magnet synchronous motor to run at a first frequency, wherein the ratio of the first frequency to the rated running frequency is a preset ratio threshold value, and the ratio threshold value is smaller than or equal to 1;

detecting reactive current of the permanent magnet synchronous motor to obtain at least two second reactive current values;

and determining an average value of the at least two second reactive current values as the reactive current average value.

3. The method of claim 2, wherein the ratio threshold is 1/2.

4. The method of claim 2, wherein driving the permanent magnet synchronous motor to operate at a first output voltage corresponding to a target frequency comprises:

acquiring rated counter potential voltage of the permanent magnet synchronous motor;

determining the first output voltage corresponding to the target frequency according to a linear relation between the rated operating frequency and the rated counter potential voltage;

and driving the permanent magnet synchronous motor to operate by the first output voltage, wherein the first output voltage is smaller than or equal to the rated counter potential voltage.

5. The method according to claim 1, wherein adjusting the first output voltage according to the first reactive current value and the reactive current average value to obtain a second output voltage, and driving the permanent magnet synchronous motor to operate with the second output voltage, comprises:

and if the difference value between the first reactive current value and the reactive current average value is in a preset fluctuation range, determining the first output voltage as the second output voltage, and driving the permanent magnet synchronous motor to run by using the second output voltage.

6. The method according to claim 1, wherein adjusting the first output voltage according to the first reactive current value and the reactive current average value to obtain a second output voltage, and driving the permanent magnet synchronous motor to operate with the second output voltage, comprises:

and if the difference value between the first reactive current value and the reactive current average value is larger than a first threshold value, reducing the first output voltage to obtain the second output voltage, and driving the permanent magnet synchronous motor to run by using the second output voltage.

7. The method according to claim 1, wherein adjusting the first output voltage according to the first reactive current value and the reactive current average value to obtain a second output voltage, and driving the permanent magnet synchronous motor to operate with the second output voltage, comprises:

and if the difference value between the first reactive current value and the reactive current average value is smaller than a second threshold value, increasing the first output voltage to obtain the second output voltage, and driving the permanent magnet synchronous motor to run by using the second output voltage.

8. A motor control device (400), characterized by comprising:

an acquisition unit (401) for acquiring a reactive current average value of the permanent magnet synchronous motor;

a first driving unit (402) for driving the permanent magnet synchronous motor to operate at a first output voltage corresponding to a target frequency;

the detection unit (403) is used for detecting a first passive current value in the running process of the permanent magnet synchronous motor;

and the second driving unit (404) is used for adjusting the first output voltage according to the first reactive current value and the reactive current average value to obtain a second output voltage, and driving the permanent magnet synchronous motor to run by using the second output voltage.

9. An electronic device (500), characterized by comprising: -a processor (502), a communication interface (504), a memory (506) and a communication bus (508), said processor (502), said memory (506) and said communication interface (504) completing communication with each other via said communication bus (508);

the memory (506) is configured to store at least one executable instruction that causes the processor (502) to perform operations corresponding to the motor control method (100) according to any one of claims 1-7.

10. A computer readable storage medium having stored thereon computer instructions which, when executed by a processor, cause the processor to perform the method of any of claims 1-7.

11. A computer program product, characterized in that the computer program product is tangibly stored on a computer-readable medium and comprises computer-executable instructions which, when executed, cause at least one processor to perform the method according to any of claims 1-7.