IPMSM field weakening control method with DC bus voltage sag being considered

A DC bus voltage and flux-weakening control technology, which is applied in the direction of AC motor control, motor control, motor generator control, etc., can solve the problems of difficulty in creating tables, lack of universality, complex implementation procedures, etc., to solve the problem of motor speed runaway effect
CN110212831AInactive Publication Date: 2019-09-06NANJING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV OF SCI & TECH
Publication Date
2019-09-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an IPMSM field weakening control method with DC bus voltage sag being considered. The method comprises the following steps: to begin with, obtaining motor parameters through off-line identification; then, calculating a direct axis current through MTPA control method formulas; judging whether entering a field weakening region and calculating a compensated direct axis current; adding the direct axis current obtained under the MTPA control method and the compensated direct axis current to obtain a given direct axis current; and finally, calculating a given quadrature axiscurrent by using a current limit circle equation of an IPMSM. The method eliminates the influence of out of control of the motor caused under a general control method due to change of base speed of the motor likely to be caused by change of DC bus voltage through a field weakening control method compensated by negative direct axis current, and can still maintain constant-speed operation of the motor under the condition of sharp drop of the bus voltage.
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Description

technical field

[0001] The invention relates to motor technology, in particular to an IPMSM magnetic field weakening control method considering the DC bus voltage drop. Background technique

[0002] The built-in permanent magnet synchronous motor (IPMSM) is playing an increasingly important role in the field of AC servo due to its advantages of high efficiency, simple structure and small size. In order to broaden the motor speed range of the permanent magnet synchronous motor, various methods have been proposed. Due to the existence of permanent magnets in IPMSM, the counter electromotive force will exceed the loading voltage at high speed, and a weak magnetic current must be applied to maintain the stability of the motor at high speed.

[0003] The traditional IPMSM field weakening control method is based on the fact that the DC bus voltage is a constant value, mainly including: formula calculation method, table look-up method, gradient descent method and other algorithms....

Claims

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