CN-115173771-B - Control method and device for calibrating external characteristics of permanent magnet synchronous motor

CN115173771BCN 115173771 BCN115173771 BCN 115173771BCN-115173771-B

Abstract

The embodiment of the disclosure provides a control method and device for calibrating external characteristics of a permanent magnet synchronous motor, a calibration system, a storage medium and electronic equipment, wherein the control method comprises the steps of setting a voltage angle value as a first set value and gradually increasing a voltage amplitude value; judging the positive and negative states of a d-axis current value, judging whether the voltage amplitude reaches a second set value or not under the condition that the d-axis current value is in a negative state, increasing the voltage angle value under the condition that the voltage amplitude reaches the second set value, and determining the external characteristics of the permanent magnet synchronous motor under the condition that the voltage angle value reaches a third set value. The embodiment of the disclosure does not need complicated steps such as MTPA calibration data, and the like, and can simply and reliably mark the external characteristics of the high-rotation-speed region of the permanent magnet synchronous motor.

Inventors

PAN ZHONGLIANG
ZHAO HUICHAO
RAN ZAIQING
DONG LIJIA
LI SHUAI

Assignees

中国第一汽车股份有限公司

Dates

Publication Date: 20260512
Application Date: 20220620

Claims (3)

1. The system is characterized by comprising a permanent magnet synchronous motor, a control device for calibrating the external characteristics of the permanent magnet synchronous motor and a measurement and control machine, wherein the permanent magnet synchronous motor and a locked rotor tool matched with the permanent magnet synchronous motor are arranged on a rack, the permanent magnet synchronous motor is fixed by a pressing clamp, the locked rotor tool is arranged on a guide rail of the rack and positioned at the shaft end of the permanent magnet synchronous motor, the locked rotor tool moves back and forth along the guide rail in a rocker mode and adopts a cylinder locking position, a locked rotor index plate of the locked rotor tool is connected with a flange plate at the shaft end of the permanent magnet synchronous motor through a pin, the locked rotor index plate is pushed into the locked rotor index plate by a blocking block arranged on the rack under the driving of a cylinder, a command is sent by a rack upper computer through the rocker and the cylinder to lock the locked rotor tool, a control and power supply line beam of the rack upper computer are connected with a motor controller, a three-phase line and a rotation change of the motor controller are connected with the permanent magnet synchronous motor to be tested and control an output shaft of the permanent magnet synchronous motor, and a torque sensor is arranged in the motor, and the torque sensor is connected with the motor; the control device for calibrating the external characteristics of the permanent magnet synchronous motor comprises: The voltage amplitude increasing module is used for setting the voltage angle value to a first set value and gradually increasing the voltage amplitude; The judging module is used for judging the positive and negative states of the d-axis current value, and judging whether the voltage amplitude reaches a second set value or not under the condition that the d-axis current value is in a negative state; The voltage angle value increasing module is used for increasing the voltage angle value under the condition that the voltage amplitude reaches a second set value; The external characteristic determining module is used for determining the external characteristic of the permanent magnet synchronous motor under the condition that the voltage angle value reaches a third set value; The external characteristic determining module is also used for acquiring the rotating speed and the output torque of the permanent magnet synchronous motor in real time through a rotating speed torque sensor in the measuring and controlling machine to obtain the maximum torque value of the permanent magnet synchronous motor; the judging module is further used for increasing the voltage angle value under the condition that the d-axis current value is in a positive value state.
2. The system for calibrating external characteristics of a permanent magnet synchronous motor according to claim 1, wherein after said setting the voltage angle value to a first set value and gradually increasing the voltage amplitude, said control means is further configured to: Detecting a motor rotation speed value; And when the motor rotation speed value meets the preset condition, the control measurement and control machine is controlled to be converted into a rotation speed control mode from a follow-up mode.
3. The system for calibrating external characteristics of a permanent magnet synchronous motor according to claim 2, wherein said control means is further adapted to continue increasing said voltage amplitude in case said motor speed value reaches a fourth set value.

Description

Control method and device for calibrating external characteristics of permanent magnet synchronous motor Technical Field The disclosure relates to the technical field of motor calibration, in particular to a control method, a device, a calibration system, a storage medium and electronic equipment for calibrating external characteristics of a permanent magnet synchronous motor. Background In the design of the electromagnetic scheme of the permanent magnet synchronous motor, whether the external characteristics of the actually manufactured permanent magnet synchronous motor accord with the designed electromagnetic scheme is required to be verified through the bench. At present, a manual calibration method is adopted in the process of calibrating the permanent magnet synchronous motor, namely, under different working conditions (different required torques T and motor rotating speeds eta), an initial current instruction (Id, iq) of a torque point is set, then the actual measured torque, the current value and the motor efficiency of the bench are manually observed and judged, so that the current instruction is continuously and manually adjusted, the numerical value of an optimal torque instruction (Id, iq) of the calibration point is obtained to be matched with the optimal torque, and the target values of the required Id and Iq are obtained. The method can generate reading errors in the manual processing process, can cause a larger temperature change range of the motor, influence the flux linkage size and further influence the calibration precision, and more importantly, can take longer time to calibrate and process data, thereby limiting the precision of the calibration of the motor rack and improving the calibration working efficiency. The calibration period of manual calibration is long, a large number of working points need to be scanned in a bench development test, and the voltage, current and the need of each working point are kept in a limited boundary range, so that the time of a test engineer and a calibration engineer is consumed on a large number of repeated works. The manual calibration workload is large, the higher the torque precision requirement is, the finer the calibration torque point graduation is, the calibration workload is increased in geometric progression, the later stage of the test result also needs to manually edit calibration data and test reports, and the quality of the report cannot be ensured. The manual calibration is seriously dependent on experience of a calibration engineer, so that the torque precision of a real vehicle is difficult to improve, and the time is invalid to use due to manual errors, so that a test plan is delayed again and again. The long-term occupation of the bench resources. In the process of realizing automatic calibration, under the general condition, MTPA data of a permanent magnet synchronous motor needs to be calibrated as basic data for calibration, and then the external characteristics of the motor in the full-rotation-speed area are calibrated by adjusting dq axis current. In the current region, by adjusting the dq-axis current, the external characteristics of the current region are easily obtained. However, when the rotating speed of the permanent magnet synchronous motor is high, the d-axis current needs to be regulated to perform flux weakening control so as to prevent the current controller from being out of control, meanwhile, the current amplitude needs to be noted within an allowable range so as not to be excessive, and the workload is high. In addition, the motor calibration of the high rotation speed of the general permanent magnet synchronous motor is performed by taking the MTPA data, which refers to the maximum torque to current ratio (MTPA) as a premise, and the MAP of the MTPA torque for calibrating the global current takes longer. Disclosure of Invention The embodiment of the disclosure aims to provide a control method, a device, a calibration system, a storage medium and electronic equipment for calibrating external characteristics of a permanent magnet synchronous motor, so as to solve the problems in the prior art. In order to solve the above technical problems, the embodiments of the present disclosure adopt the following technical solutions: a control method for calibrating external characteristics of a permanent magnet synchronous motor comprises the following steps: setting the voltage angle value as a first set value and gradually increasing the voltage amplitude value; judging the positive and negative states of a d-axis current value, and judging whether the voltage amplitude reaches a second set value or not under the condition that the d-axis current value is in a negative state; Increasing the voltage angle value under the condition that the voltage amplitude reaches a second set value; And when the voltage angle value reaches a third set value, determining the external characteristic of the permanent magnet synchronous moto