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Weak magnetic control method for permanent magnet synchronous motor

A permanent magnet synchronous motor and field-weakening control technology, which is applied in the field of power electronics and electric transmission, can solve the problems of poor robustness and poor portability, and achieve the effect of improving efficiency and load capacity, and the method is simple and easy to implement

Inactive Publication Date: 2012-08-29
BEIJING JIAOTONG UNIV
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Problems solved by technology

The document "Longya Xu, Yuan Zhang, Guven M K.A new method to optimize q-axis voltage for deep flux weakening control of IPM machines based on single current regulator. International Conference on Machines and Systems, 2008, 2750-2754" proposes to use offline calculation Combined with the online look-up table method to give the motor quadrature axis voltage command, but due to the need for a large amount of offline experimental data, the portability is poor, and the robustness to parameter changes is poor

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  • Weak magnetic control method for permanent magnet synchronous motor
  • Weak magnetic control method for permanent magnet synchronous motor
  • Weak magnetic control method for permanent magnet synchronous motor

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[0019] Refer to the following Figure 1-6 Examples of the present invention will be described.

[0020] In order to make the above objects, features and advantages more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] Such as figure 1 As shown, a field weakening control method for a permanent magnet synchronous motor comprises the following steps:

[0022] S1. Obtain the direct axis current command through the motor speed regulator;

[0023] S2. Calculate the command value of the quadrature-axis voltage of the motor through the direct-axis voltage command value output by the motor direct-axis current regulator and the maximum voltage value output by the inverter, so as to ensure that the motor voltage reaches the maximum value in the field weakening interval.

[0024] The embodiment of the present invention enables the motor to work at the optimal operating point ...

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Abstract

The invention discloses a weak magnetic control method for a permanent magnet synchronous motor. The method comprises the following steps that: direct axis current instructions are obtained through a motor rotating speed regulator; and instruction values of motor alternating axis voltage are obtained by calculation through the direct axis voltage instruction value output by a motor direct axis current regulator and the maximum voltage value output by an inverter, and the motor voltage is guaranteed to reach the maximum value at the weak magnetic interval. The method provided by the invention can be used for solving the problem of nonideal system control effect caused by alternating and direct axis current coupling in weak magnetic control, and in addition, the voltage utilization rate can be improved.

Description

technical field [0001] The invention relates to the technical field of power electronics and electric transmission, in particular to a field-weakening control method of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors are widely used for their excellent performance. In order to obtain a wider speed range, the permanent magnet synchronous motor needs field weakening control. The existing field weakening control methods mainly include formula calculation method, table look-up method, gradient descent method, and negative direct axis current compensation method. Each of the above-mentioned field weakening control methods has a quadrature-axis current regulator and a direct-axis current regulator. During field-weakening control, the motor voltage is limited by the inverter and cannot be increased. With the increase of the motor speed, the AC-D axis current coupling of the motor is strengthened, the control effect of the mo...

Claims

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Application Information

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IPC IPC(8): H02P6/08H02P21/22
Inventor 林飞杨中平胡太元林科振郭希铮张立伟王琛琛王剑刘建强黄先进孙湖李艳李虹贺明智郝瑞祥游小杰郑琼林
Owner BEIJING JIAOTONG UNIV
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