Permanent-magnet synchronous motor control system and method

A permanent magnet synchronous motor and control system technology, which is applied in the control system, AC motor control, motor vibration suppression control, etc., can solve the problems of air gap flux linkage oscillation, unstable operation, etc.

Active Publication Date: 2017-09-05
中山长峰智能自动化装备研究院有限公司
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AI Technical Summary

Problems solved by technology

When the permanent magnet synchronous motor is under open-loop control, the fluctuation of the reactive current of the permanent magnet synchronous motor will cause the air gap flux linkage to oscillate, which will lead to the unstable operation of the open-loop control system under no-load and light-load conditions

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  • Permanent-magnet synchronous motor control system and method
  • Permanent-magnet synchronous motor control system and method

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Embodiment Construction

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0057] The purpose of the present invention is to provide a permanent magnet synchronous motor control system and method, which uses reactive power balance as the control target to compensate the voltage and rotational speed, which can not only realize the stability of the system, but also allow the current to be used with maximum efficiency.

[0058] In order to make the above objects, features and advantages of the present invention more compreh...

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Abstract

The invention discloses a permanent-magnet synchronous motor control system and method. The system comprises a lifting speed controller, a V/F curve controller, an SPWM modulator, a voltage source inverter, a permanent-magnet synchronous motor, a coordinate transformation circuit, a voltage compensation circuit and a rotational-speed compensation circuit. The V/F curve controller obtains a compensated rotational speed according to a given rotational speed and a compensating rotational speed; the V/F curve controller obtains given voltage according to the compensated rotational speed and a V/F control curve; the SPWM modulator obtains compensated voltage according to the given voltage and compensating voltage; the SPWM modulator conducts sinusoidal pulse width modulation on the compensated voltage to obtain a modulation signal; the voltage source inverter conducts inversion according to the modulation signal to obtain three-phase current and outputs the three-phase current to the permanent-magnet synchronous motor. According to the permanent-magnet synchronous motor control system and method, through the rotational speed compensation and stator voltage compensation of the permanent-magnet synchronous motor, the changes of reactive power are inhibited, the reactive power of the system is kept unchanged, and therefore the fluctuation of reactive current and the oscillation of the system are inhibited, and the system runs smoothly.

Description

technical field [0001] The invention relates to the technical field of automation control, in particular to a permanent magnet synchronous motor control system and method. Background technique [0002] With the development of power electronics technology, microelectronics technology, sensor technology, rare-earth permanent magnet materials and motor control theory, the research and application of permanent magnet synchronous motors have received widespread attention. Permanent magnet synchronous motors do not require current excitation, brushes and slip rings, and have the advantages of simple structure, high efficiency, high power factor, high power density, small size, low moment of inertia, easy heat dissipation and maintenance. With the improvement of the magnetic properties of materials and the emergence of new permanent magnet materials, in motion control systems with high precision, high reliability and wide speed range, high-power permanent magnet synchronous motors ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/10H02P23/04H02P25/024H02P27/08
Inventor 黄毅
Owner 中山长峰智能自动化装备研究院有限公司
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