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A self-adaptive field weakening control method for permanent magnet synchronous motor

A permanent magnet synchronous motor and field-weakening control technology, which is applied in the fields of motor generator control, AC motor control, electronic commutation motor control, etc., can solve the problems of large algorithm calculation and heavy dependence on motor parameters, etc., and achieve command excitation The effect of stable current, fast operation speed and fast response speed

Active Publication Date: 2020-06-26
深圳市富鑫产业科技有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide an adaptive field-weakening control method for permanent magnet synchronous motors to solve the problems of existing field-weakening methods that rely too much on motor parameters and have a large amount of algorithm calculations.

Method used

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  • A self-adaptive field weakening control method for permanent magnet synchronous motor
  • A self-adaptive field weakening control method for permanent magnet synchronous motor
  • A self-adaptive field weakening control method for permanent magnet synchronous motor

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Embodiment Construction

[0049] The present invention will be further described below with reference to the accompanying drawings and examples, and the embodiments of the present invention include but not limited to the following examples.

[0050] A method for adaptive field weakening control of a permanent magnet synchronous motor comprises the following steps:

[0051] (a) At the rated speed of the permanent magnet synchronous motor, the command excitation current i d = 0 vector control experiment; calculate the d-axis control voltage u according to the permanent magnet synchronous motor vector control PI method d , q-axis control voltage u q And sample the DC bus voltage u dc Calculate the real-time modulation ratio m r , according to the real-time modulation ratio m r Determine the maximum and minimum values ​​of the vibration amplitude of the modulation ratio, m rmax and m rmin ;Maximum vibration amplitude m rmax and minimum m rmin The setting of is determined by the actual situation, su...

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Abstract

The present invention discloses a method for adaptive field-weakening control of a permanent magnet synchronous motor. The objective of the invention is to mainly solve the problems that a current field-weakening method depends too much on motor parameters and computation load of an algorithm is large in the prior art. The method provided by the invention, according to specific application conditions of a permanent magnet synchronous motor, calculates a real-time modulation ratio mr, a switching point modulation ratio mf, an exit field-weakening point modulation ratio mq and a modulation hysteresis width [Delta]m0, and determines a basic excitation current value [Delta]id0, a direction coefficient P1 and a field current difference coefficient P2, and a current instruction cycle instructionexcitation current is calculated through a formula. Through the above scheme, an influence of working conditions on field-weakening points is avoided, and field-weakening switching points are automatically switched according to a real-time modulation ratio so as to realize stable field-weakening switching of a permanent magnet synchronous motor with different conditions such as different rotatingspeeds and voltages and have a high practical value and a promotion value.

Description

technical field [0001] The invention relates to the technical field of permanent magnet synchronous motor control for electric vehicles, in particular to an adaptive field weakening control method for permanent magnet synchronous motors. Background technique [0002] The permanent magnet synchronous motor is a multivariable, high-order, nonlinear, and strongly coupled controlled object. The motor parameters will vary with the motor model and working conditions. Usually, after the running speed of the permanent magnet synchronous motor is higher than the rated speed, the vector control of the motor makes the output voltage of the inverter reach the maximum, which is balanced with the back electromotive force of the motor, so that the speed cannot continue to rise. In order to further increase the motor speed, it is necessary to reduce the back electromotive force of the motor by reducing the magnetic field of the permanent magnet and increase the motor speed. Usually, techni...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P21/22H02P25/024H02P27/08
Inventor 徐恺郑钢辛小帅徐红兵王跃斌郭罗乐劼宏宇
Owner 深圳市富鑫产业科技有限公司
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