Method and device for acquiring time delay of permanent magnet motor control system
A technology for control systems and permanent magnet motors, applied in control systems, motor control, vector control systems, etc., can solve problems such as large delay time deviations, and achieve the effect of ensuring stable operation and improving dynamic performance
Active Publication Date: 2019-12-06
CHINA RAILWAYS CORPORATION +3
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However, in the actual system, due to the influence of non-ideal factors such as inverter dead time, sampling filter time and switching device delay, the theoretical calculation results deviate greatly from the actual delay time
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[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0043] The invention provides a method for acquiring time delay of a permanent magnet motor control system, such as figure 1 As shown, the delay acquisition method of the permanent magnet motor control system includes:
[0044] S101: Control the motor under test to run at a constant speed under no-load conditions;
[0045] By adjusting the test motor to make it work at a constant speed, the mechanical angular velocity of the motor is ω. The motor under test ...
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The invention provides a method and device for obtaining time delay of a control system of a permanent magnet motor. The method includes the steps that the tested motor is controlled to operate at constant rotating speed under an idle condition; a d-axis voltage instruction of the tested motor is input into an angle compensation PI adjustor of the control system of the motor to control the angle compensation PI adjustor to generate a delay compensation angle; the delay compensation angle is utilized for correcting a d-axis voltage instruction and a q-axis voltage instruction output by a current control PI adjustor; when the d-axis voltage instruction output by the current control PI adjustor is corrected to be zero, the delay time of the control system of the motor is calculated accordingto the mechanical angular speed of the tested motor and the present corresponding delay compensation angle. Influences of non-ideal factors of the control system of the motor are considered, and the delay time of the control system of the permanent magnet motor can be accurately obtained.
Description
technical field [0001] The invention relates to the technical field of AC motor drive, in particular to a method and device for acquiring time delay of a permanent magnet motor control system. Background technique [0002] In high-power applications, the inverter switching frequency is generally less than 1000 Hz, while the motor frequency is required to reach several hundred Hz. The voltage amplitude attenuation and phase lag caused by the delay of the control system are large. If the delay is not compensated, the control lag will deteriorate the dynamic performance of the vector control system, the magnetic field orientation will not be accurate, and the current regulator will fail. In severe cases, unstable phenomena such as system runaway and current oscillation will occur. [0003] At present, the calculation of the delay of the digital control system is mainly based on the system control timing diagram. However, in the actual system, due to the influence of non-ideal...
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IPC IPC(8): H02P21/12H02P21/14H02P27/08H02P21/22
CPCH02P21/12H02P21/14H02P21/22H02P27/085H02P2205/01
Inventor 邱腾飞谢冰若白龙卜丽东孙浩清蒋威刘佳璐管健龙高旭东杨光威唐蕾程建华赵雷廷徐晗严翔刘洋杨雪松杜玉亮金炜
Owner CHINA RAILWAYS CORPORATION