A control method and system for a permanent magnet vernier linear motor
A technology of linear motors and control methods, applied in control systems, vector control systems, motor generator control, etc., can solve the problems of output electromagnetic thrust fluctuations and low precision of control systems, so as to improve control capabilities, improve control accuracy, reduce fluctuating effect
Active Publication Date: 2020-12-29
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a control method and system for a permanent magnet vernier linear motor, aiming at solving the problem that the traditional three-phase symmetrical control method is applied to the three-phase asymmetrical system of the linear motor windings and the output electromagnetic thrust fluctuates , the problem of low precision of the control system
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[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The accompanying drawings are only for reference and illustration, and are not used to limit the present invention. The dimensions shown in the drawings are only for the convenience of clear description, and do not limit the proportional relationship.
[0044] It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the ...
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The invention discloses a control method and system for a permanent magnet vernier linear motor, and the method comprises the steps: calculating a reference current positive sequence component and a reference current negative sequence component under a dq coordinate system according to the counter electromotive force characteristics of the motor and an output signal of a speed controller; performing Park inverse transformation on the reference current positive sequence component and the reference current negative sequence component under the dq coordinate system to a two-phase static alpha-beta coordinate system; outputting a current error signal generated by the difference between the reference current positive sequence component and the reference current negative sequence component underthe alpha beta coordinate system and the motor current through the VPI controller, and generating a switching signal of an inverter switch through SVPWM. The system comprises a speed controller, a current positive and negative sequence component reference value calculation module, a first Park inverse transformation module, a second Park inverse transformation module, a current VPI controller andan SVPWM module. According to the invention, the fluctuation of the electromagnetic thrust output by the motor can be effectively reduced, and the current control precision is improved, so that moreideal control performance is obtained.
Description
technical field [0001] The invention belongs to the field of motor servo and control, and more specifically relates to a control method and system for a permanent magnet vernier linear motor. Background technique [0002] With the rapid development of a series of advanced processing and manufacturing technologies such as ultra-high-speed cutting, ultra-precision machining, and multi-axis linkage, mechanical processing has higher and higher performance requirements for machine tools. Compared with the traditional "rotary motor + ball screw" transmission mode, the linear motor cancels the mechanical mechanism of the motor and the table, so that it can realize the high-speed response of direct drive, reduce the mechanical friction and improve the precision of the machine tool. It has become a trend for high-performance machine tools to be driven by linear motors. [0003] In order to ensure the control accuracy and performance requirements, the control system of linear motors ...
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IPC IPC(8): H02P21/00H02P21/14H02P21/18H02P21/22H02P25/06H02P27/08
CPCH02P21/0003H02P21/14H02P25/06H02P27/085H02P21/18H02P21/22
Inventor 孔武斌陈智曲荣海周游
Owner HUAZHONG UNIV OF SCI & TECH