Field Weakening Control Method for Full Speed ​​Range of Permanent Magnet Synchronous Motor

A permanent magnet synchronous motor, speed range technology, applied in motor control, motor generator control, AC motor control and other directions, can solve the problems of inability to calibrate the motor, complex calibration process, etc., to reduce the cost of labor, time, and control accuracy. The effect of high and increasing specific power

Active Publication Date: 2020-11-03
BIT HUACHUANG ELECTRIC VEHICLE TECH
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Problems solved by technology

[0008] Although this method has high reliability, it fails to realize the maximum output potential of the motor and the controller below the base speed, and the whole calibration process is too complicated to calibrate each motor, resulting in uncertain parameters. Sexuality causes the motor to fail to work at peak efficiency throughout the speed range

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  • Field Weakening Control Method for Full Speed ​​Range of Permanent Magnet Synchronous Motor
  • Field Weakening Control Method for Full Speed ​​Range of Permanent Magnet Synchronous Motor
  • Field Weakening Control Method for Full Speed ​​Range of Permanent Magnet Synchronous Motor

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Embodiment Construction

[0042] The present invention is described in detail below with reference to accompanying drawing and embodiment:

[0043] attached figure 1It can be seen that, a method for field weakening control of permanent magnet synchronous motors in the full speed range, the calibration obtains the three-dimensional table of the maximum torque-speed characteristic curve of the motor: speed(n)-torque(T max )-current (i d,Tmax );

[0044] Calibrate to obtain the working point on the maximum torque current ratio curve (MTPA), and on this basis, calibrate to obtain the three-dimensional table of the switching torque-speed characteristic curve: speed (n)-torque (T P )-current (i d,Tp );

[0045] Obtain the maximum torque and switching torque that can be output at the current speed;

[0046] Obtain the target output torque in this state;

[0047] According to the speed-torque-current table obtained above, the optimal field-weakening operating current in the current state is obtained.

...

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Abstract

The invention relates to a full-rotation-speed-range weak magnetic control method of a PMSM. A maximal torque-rotating speed characteristic curve 3D table of the motor is obtained by calibration; a work point in an MTPA (Maximum Torque per Ampere) curve is obtained by calibration, and a switching torque-rotating speed characteristic curve 3D table is obtained by calibration; the maximal torque andswitching torque that can be output in the present rotating speed are obtained; a target output torque in the state is obtained; and an obtained rotating speed-torque-current is looked up to obtain the optimal weak-magnetic work current in the present state. Via the control method, a control strategy for realizing high-efficiency weak-magnetic control for the PMSM in the full rotation speed rangeis obtained, the strategy can be used to simplify calibration control of the PMSM, the optimal work state of the motor is determined in the full rotation speed range, copper loss of the motor is reduced greatly, the control precision is high, response to the torque is rapid, the control efficiency is high, realization is simple and the versatility is high.

Description

technical field [0001] The invention relates to a control method for a permanent magnet synchronous motor, in particular to a method for controlling the field weakening in the full speed range of the permanent magnet synchronous motor. Background technique [0002] In recent years, the number of cars in the world has continued to increase, which has caused a series of serious problems including energy shortages and environmental pollution. In this context, all kinds of new energy vehicles that use electric motors as their sole or partial driving sources have attracted widespread attention worldwide due to their unique advantages of energy saving, environmental protection and high efficiency. Among them, benefiting from the rapid development of rare earth permanent magnet material technology, permanent magnet synchronous motors (PMSM) with high power density, high reliability, and wide speed range have gradually replaced AC asynchronous motors and become the mainstream of aut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P25/022
CPCH02P21/0003H02P25/024H02P2207/05
Inventor 林程时军辉程兴群黄卓然邢济垒
Owner BIT HUACHUANG ELECTRIC VEHICLE TECH
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