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A permanent magnet synchronous motor derating control method, device and permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and control method, applied in the direction of motor control, motor generator control, control of electromechanical transmission devices, etc., can solve the problems of motor failure, affecting the driving safety of automobiles, increasing current fluctuations, etc., to avoid unexpected Output or damage, the effect of improving reliability and stability

Active Publication Date: 2021-05-07
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this general method directly superimposes the result of PI output on the direct axis current, which will increase the current fluctuation and affect the control effect. In severe cases, current fluctuation will cause motor failure and affect the driving safety of the car.

Method used

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  • A permanent magnet synchronous motor derating control method, device and permanent magnet synchronous motor
  • A permanent magnet synchronous motor derating control method, device and permanent magnet synchronous motor
  • A permanent magnet synchronous motor derating control method, device and permanent magnet synchronous motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] figure 1 It is a flowchart of a derating control method for a permanent magnet synchronous motor provided by an embodiment of the present invention. Such as figure 1 As shown, the permanent magnet synchronous motor derating control method includes:

[0028] Step S101, obtaining the modulation coefficient k of the motor, and comparing the modulation coefficient k with a preset threshold value to obtain a comparison result, wherein the preset threshold value includes a first preset threshold value a and a second preset threshold value b, and the first preset threshold value The threshold a is set to be smaller than the second preset threshold b.

[0029] Specifically, a range value of the modulation coefficient k, that is, the above-mentioned preset threshold value, is set, the range value includes a first preset threshold value a and a second preset threshold value b, and a

[0030] Step S102, if the comparison result is that the modulation coefficient k is great...

Embodiment 2

[0086] The embodiment of the present invention also provides a permanent magnet synchronous motor derating control device, which is used to implement the permanent magnet synchronous motor derating control method provided in the first embodiment of the present invention. The volume control device is introduced in detail.

[0087] Figure 7 It is a structural diagram of a permanent magnet synchronous motor derating control device provided by an embodiment of the present invention, as shown in Figure 7 As shown, the permanent magnet synchronous motor derating control device mainly includes: a comparison module 71, a first determination module 72, a first query module 73, and a control module 74, wherein:

[0088] The comparison module 71 is configured to obtain the modulation coefficient of the motor, and compare the modulation coefficient with a preset threshold to obtain a comparison result, wherein the preset threshold includes a first preset threshold and a second preset t...

Embodiment 3

[0122] An embodiment of the present invention also provides a permanent magnet synchronous motor, which uses the permanent magnet synchronous motor derating control method described in any one of the above embodiments.

[0123] The permanent magnet synchronous motor in the embodiment of the present invention performs derating control by using the permanent magnet synchronous motor derating control method described in the above embodiment, which solves the problem of directly superimposing the result output by the controller into the direct axis current in the prior art The technical problem that the generated current fluctuation affects the control effect of the motor improves the reliability and stability of the field weakening control of the permanent magnet synchronous motor, avoids the saturation of the inverter controlling the permanent magnet synchronous motor and causes unexpected output or damage, and ensures This ensures that the vehicle can operate normally under extr...

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PUM

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Abstract

The invention discloses a permanent magnet synchronous motor derating control method, device and permanent magnet synchronous motor. The method includes: obtaining the modulation coefficient of the motor, and comparing the modulation coefficient with a preset threshold to obtain a comparison result; if the comparison result is If the modulation coefficient is greater than the first preset threshold and less than the second preset threshold, then the derating torque of the motor is determined based on the modulation coefficient; the current command value is obtained by querying the three-dimensional current look-up table according to the derating torque; the current command value obtained based on the query Control the inverter to output the corresponding current to control the derating operation of the motor. The invention improves the reliability and stability of the field-weakening control of the permanent magnet synchronous motor, avoids the unexpected output or damage caused by the saturation of the inverter controlling the permanent magnet synchronous motor, and ensures that the vehicle can be operated under extremely low temperature conditions and rapid acceleration. It can operate normally under deceleration and bad road conditions.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of permanent magnet synchronous motor control, in particular to a permanent magnet synchronous motor derating control method and device, and a permanent magnet synchronous motor. Background technique [0002] In order to alleviate the increasingly serious problems of environmental pollution and energy depletion, electric vehicles have emerged at the historic moment due to their green and environmentally friendly features and have received widespread attention. Among them, permanent magnet synchronous motors have replaced other The motor has become the core component of the electric vehicle, so it is of great significance to develop a field-weakening control strategy to make the permanent magnet synchronous motor safe and reliable and operate in a wide speed range. [0003] The back EMF of the permanent magnet synchronous motor is proportional to the speed and flux linkage. As the speed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/08H02P21/22
CPCH02P6/08H02P2207/05H02P21/22
Inventor 范雨卉李帅李岩潘忠亮李伟亮
Owner CHINA FIRST AUTOMOBILE