Open-loop control method and open-loop control system of permanent magnet synchronous motor based on space vector pulse width modulation (SVPWM)

A permanent magnet synchronous motor, open-loop control technology, applied in control systems, vector control systems, motor generator control, etc., can solve problems such as motor out-of-step, motor open-loop control system overcurrent, etc.

Active Publication Date: 2012-12-26
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem with this is that when the external load is large, small or abrupt, the motor is prone to out-of-step, resulting in overcurrent in the open-loop control system of the motor.

Method used

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  • Open-loop control method and open-loop control system of permanent magnet synchronous motor based on space vector pulse width modulation (SVPWM)
  • Open-loop control method and open-loop control system of permanent magnet synchronous motor based on space vector pulse width modulation (SVPWM)
  • Open-loop control method and open-loop control system of permanent magnet synchronous motor based on space vector pulse width modulation (SVPWM)

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Embodiment Construction

[0108] In order to enable those skilled in the art to better understand and implement the technical solution of the present invention, the working principle of the permanent magnet synchronous motor applied in the present invention is firstly described below.

[0109] 1. The following first introduces the principle of maximum torque current ratio (MTPA, Maximum Torque Per Ampere):

[0110] Permanent magnet synchronous motor torque T L The equation is:

[0111] T L =1.5n p (ψ f i q +(L d -L q )i d i q ) (10)

[0112] Among them, i d i q are the components of the stator current on the d-axis and q-axis respectively; L d , L q are direct axis synchronous inductance and quadrature axis synchronous inductance respectively; ψ f is the motor flux linkage, which is a known quantity; n p is the number of pole pairs of the motor;

[0113] For the convenience of analysis, the above equation is per unitized:

[0114] t en = i qn (1-i dn ) (11)

[0115] Among them, t ...

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Abstract

The invention discloses an open-loop control method and an open-loop control system of a permanent magnet synchronous motor based on space vector pulse width modulation (SVPWM). To each given stator power frequency, the amplitude of stator voltage corresponding to the given stator power frequency is found through searching a two-dimensional vector table of the stator voltage and the stator power frequency, wherein the two-dimensional vector table is set according to a sectional voltage/frequency ratio curve in advance, that is to say, the ratio of the stator voltage and the stator power frequency in the two-dimensional vector table disclosed by the invention is not a normal value; and the ratio is different in different interval sections. In the prior art, as the voltage/frequency ratio is a normal value, when a load changes, a motor is out of step easily so as to cause overcurrent to the system. In the method disclosed by the invention, the sectional voltage/frequency ratio can guarantee the motor to adapt to the change of the load, reduce the consumption of the motor and improve the efficiency. In a constant power area, phase compensation is introduced, so that weak magnetic control is realized by using the regulated phase, and weak magnetic speed improvement is realized.

Description

technical field [0001] The invention relates to the technical field of permanent magnet synchronous motor control, in particular to an open-loop control method and system for permanent magnet synchronous motors based on SVPWM modulation. Background technique [0002] The permanent magnet synchronous motor (PMSM, Permanet Magnet Synchronous Motor) transmission system refers to a new type of transmission system that takes PMSM as the control object and controls the speed and torque of PMSM through frequency modulation and voltage regulation. The PMSM transmission system generally includes the main circuit, the control system and the PMSM. The main circuit mainly includes: DC bus, supporting capacitors, and inverters composed of power devices; the control system is a real-time control system built on a hardware platform such as DSP or CPU, using motor control theory. The control system adjusts the amplitude and frequency of the AC voltage applied to the motor by controlling th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/16
Inventor 冯江华刘可安何亚屏许峻峰文宇良张朝阳刘雄
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD
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