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Variable PI flux-weakening control method and driving control apparatus for permanent magnet synchronous motor

A permanent magnet synchronous motor and field weakening control technology, which is applied in the control of electromechanical transmission, motor generator control, electronic commutation motor control, etc., can solve the problems of speed loop hysteresis characteristic loop instability, etc. fast response effect

Inactive Publication Date: 2016-06-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the operating frequency drops rapidly or the input voltage recovers, it is not advisable to exit the field weakening state too quickly, otherwise the hysteresis characteristic of the speed loop will cause loop instability

Method used

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  • Variable PI flux-weakening control method and driving control apparatus for permanent magnet synchronous motor
  • Variable PI flux-weakening control method and driving control apparatus for permanent magnet synchronous motor
  • Variable PI flux-weakening control method and driving control apparatus for permanent magnet synchronous motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the control circuit topology of the permanent magnet synchronous motor PMSM includes a control chip, a three-phase bridge drive circuit composed of a power switch tube, and a permanent magnet synchronous machine. Wherein, the drive circuit has 6 IGBTs, and the drive circuit is connected with a diode in reverse parallel at the same time. In addition, the capacitor is an electrolytic capacitor C, U+ and U- are the voltages of the upper and lower bridge arms of the U phase respectively, and V+ and V- are respectively The voltages of the upper and lower bridge arms of the V phase, W+, W- are the voltages of the upper and lower bridge arms of the W phase, respectively. The control chip outputs the compressor driving signal, and the compressor driving signal controls the operation of the compressor through the driving circuit, and detects the phase current of the compressor through three current sensors.

[0028] Such as figure 2 As shown, it is ...

Embodiment 2

[0044] This embodiment is the same as Embodiment 1 except for the following:

[0045] The driving circuit has 6 MOSFETs, the driving signal of the compressor controls the operation of the compressor through the driving circuit, and the phase current detection of the compressor is carried out through two current sensors.

Embodiment 3

[0047] This embodiment is the same as Embodiment 1 except for the following:

[0048] The driving circuit adopts intelligent power module IPM.

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Abstract

The invention discloses a variable PI flux-weakening control method for a permanent magnet synchronous motor. The flux-weakening control method comprises the following steps of calculating an output voltage amplitude value according to a vector-controlled output voltage vector of the permanent magnet synchronous motor, and setting a voltage amplitude-limiting threshold value for the voltage amplitude value through a controller; performing closed-loop regulation according to the output voltage amplitude value and the voltage amplitude-limiting threshold value to obtain primary flux-weakening current; and performing amplitude limiting on the primary flux-weakening current to obtain the flux-weakening current. The invention also discloses a driving control apparatus for realizing the variable PI flux-weakening control method for the permanent magnet synchronous motor; the driving control apparatus comprises a driving circuit and a control module; the control module generates a driving signal to control the driving circuit; the driving circuit generates a three-phase voltage; and the three-phase voltage is used for controlling the permanent magnet synchronous motor. The variable PI flux-weakening control method and the driving control apparatus provided by the invention have the advantages of high response speed in entering the flux-weakening state and low response speed in quitting from the flux-weakening state, and the like.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a variable PI field weakening control method and a drive control device for a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motor (PMSM) has been widely used in various industries due to its good control performance, high power density and energy saving. Among them, in many applications, permanent magnet synchronous motors are required to operate in the high frequency range, and then run in the field weakening range, such as variable frequency compressors based on permanent magnet synchronous motors, fans based on permanent magnet synchronous motors, etc. [0003] The classic field weakening control method compares the output voltage vector amplitude with the set output voltage threshold, increases the field weakening current (that is, the current in the negative direction of the d-axis in vector control), and dec...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P21/14
CPCH02P21/0003H02P21/14
Inventor 汪兆栋文小琴游林儒梁俊元
Owner SOUTH CHINA UNIV OF TECH
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