Device for detecting initial rotor position of PMSM (permanent-magnet synchronous motor)

A technology of permanent magnet synchronous motor and rotor initial position, which can be used in the control of electromechanical transmission, generator control, motor control, etc., and can solve the problems of dependence, low precision, and complex implementation.
CN107994833AActive Publication Date: 2018-05-04CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHAJNA MAJNING DRAJVS EHND AUTOMEHJSHN KO
Publication Date
2018-05-04

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Abstract

The invention relates to a device for detecting initial rotor position of a PMSM (permanent-magnet synchronous motor). The device comprises an initial position detection digital computation module, adriving circuit, a three-phase inverter module, the PMSM and a current sensor and sampling circuit, wherein the driving circuit receives signals of the initial position detection digital computation module 1 and generates IGBT driving signals; the three-phase inverter module controls IGBTs of upper and lower bridge arms of each phase to be switched on and switched off according to the driving signals generated by the driving circuit; a three-phase stator of the PMSM is connected with the three-phase inverter module; the current sensor and sampling circuit acquires currents ia, ib and ic of thea, b and c three-phase stator of the PMSM. Influence of salient rate and saturation characteristic of a motor, precision of a current sensor and zero drift of a current sampling device on positioningaccuracy is reduced greatly, and the precision for detecting the initial rotor position is improved effectively.
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Description

technical field

[0001] The invention relates to a detection device, in particular to a rotor initial position detection device of a permanent magnet synchronous motor, belonging to the technical field of permanent magnet synchronous motor control. Background technique

[0002] Permanent magnet synchronous motors have high operating efficiency, high power density, and excellent control performance, and are widely used in electric vehicles, elevators, mine hoists, wind power generation and other electric drive fields.

[0003] Obtaining the rotor position of the permanent magnet synchronous motor is one of the necessary conditions for high-performance speed regulation. In the actual permanent magnet synchronous motor speed regulation system, two methods are mainly used to obtain the rotor position. One is by installing a rotor position sensor at the motor shaft end, such as Hall sensor, incremental photoelectric encoder, absolute photoelectric encoder, resolver, etc. The seco...

Claims

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