Permanent magnet synchronous motor deep flux weakening method

A permanent magnet synchronous motor, deep technology, applied in the control of generators, motor generator control, AC motor control, etc., can solve the problems of deep magnetic field instability and other problems, achieve wide operating speed range, good dynamic response, ensure dynamic Effect of Static Properties

Inactive Publication Date: 2020-10-02
ZHEJIANG LEAPMOTOR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention solves the problem of unstable deep field weakening and provides a method for deep field weakening of permanent magnet synchronous motors

Method used

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  • Permanent magnet synchronous motor deep flux weakening method
  • Permanent magnet synchronous motor deep flux weakening method
  • Permanent magnet synchronous motor deep flux weakening method

Examples

Experimental program
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Effect test

Embodiment

[0057] Embodiment: In this embodiment, a method for deep field weakening of a permanent magnet synchronous motor, such as figure 1 shown, including the following steps:

[0058]S1: Perform voltage closed-loop calculation on the set bus voltage to obtain the d-axis current compensation amount, and the d-axis current compensation amount is recorded as ;

[0059] S2: if image 3 As shown, according to the speed (i.e. Spd), the bus voltage (i.e. U dc ) and torque (that is, Tor) to obtain the current point of the table lookup table by performing a current lookup table, and the current point of the table lookup table is denoted as ( , );

[0060] S3: Calculate the compensation current path for the d-axis current compensation amount and the look-up table current point to obtain the current compensation point, and the current compensation point is recorded as ( , );

[0061] S4: Add the current compensation point to get the reference current point, and the reference curr...

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Abstract

The invention relates to a permanent magnet synchronous motor deep flux weakening method, and aims to solve the problem of unstable depth flux weakening. The method comprises the following steps of S1, performing voltage closed-loop calculation on a set bus voltage to obtain a d-axis current compensation amount; S2, performing current table lookup according to the rotating speed, the bus voltage and the torque to obtain a table lookup current point; S3, performing compensation current path calculation on the d-axis current compensation amount and the lookup table current point to obtain a current compensation point; S4, performing additive operation on the current compensation point to obtain a reference current point; S5, respectively performing current regulation operation and feedforward voltage calculation on the reference current point to obtain a reference voltage point and a feedforward voltage compensation point; and S6, integrating the reference voltage point and the feedforward voltage compensation point, and then loading to a motor. The method has the beneficial effects that the deep flux weakening is stable, the high-speed flux weakening region is good in dynamic response, the motor operation speed range is wide, and aiming at the required voltage utilization rate, the dynamic and static characteristics of high-speed flux weakening are ensured by adopting a vector flux weakening compensation mode.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method for deep field weakening of a permanent magnet synchronous motor. Background technique [0002] With the development of the national economy and science and technology, motors play an increasingly important role in all walks of life. Due to its many advantages in design, manufacture and control, permanent magnet synchronous motors are widely used in various industrial production and life occasions. In addition, my country is rich in rare earth resources, and the application market of permanent magnet synchronous motors is particularly large in my country. Permanent magnet synchronous motors can be divided into surface mount type and built-in type according to the similarities and differences of AC and D-axis inductance. Since the built-in permanent magnet synchronous motor (IPMSM) can have a wide speed range under the condition of field weakening, it is widely use...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P21/05H02P21/22H02P27/12H02P25/022
CPCH02P21/0003H02P21/0089H02P21/05H02P25/022H02P27/12H02P21/22
Inventor 刘灿非凡
Owner ZHEJIANG LEAPMOTOR TECH CO LTD
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