Method for determining corresponding relation of phase sequence of stator winding and encoder

Abstract

The invention relates to a method for determining corresponding relation of a phase sequence of a stator winding of a brushless direct current motor and an encoder and a detecting device. The method determines the phase sequence of the stator winding according to a zero crossing point of voltage among the stator windings based on the potential zero crossing point of a counter electromotive force and a commutation point (rising edge and descending edge of an output signal of the encoder); and determines the corresponding relation between an interface of the encoder and the stator winding according to the corresponding relation of the zero crossing point of the stator winding and the rising edge and descending edge of an output signal of the encoder. The device provided by the invention uses a microprocessor system as an operational processing unit, combines a periphery hardware detection unit to detect the zero crossing point of voltage among the stator windings and the rising edge and descending edge of the output signal of the encoder so as to judge the phase at one time and determine the corresponding relation between the windings of phases and the interface of the encoder. The invention avoids the problem caused by delay of an electric angle, has the advantages of intuitive and accurate steps and simple structure of the detection device, and is appropriate for detection and judgment of the brushless direct current motor.

Description

[0001] This application is a divisional application of the patent application with the application number 200910311111.3, the application date is December 9, 2009, and the title is "Method and Device for Determining Stator Winding Phase Sequence and Its Correspondence with Encoder". technical field [0002] The invention relates to a brushless DC motor, in particular to a method for determining the phase sequence of a stator winding of a brushless DC motor and a corresponding relationship with an encoder and a detection device. Background technique [0003] The brushless DC motor uses an electronic commutation device to replace the mechanical commutation device of the traditional DC motor. It has similar mechanical characteristics to the DC motor. The magnetic steel of the brushless DC motor is placed on the rotor, and the stator windings are evenly distributed in space. For the three-phase stator windings, the U-phase windings, V-phase windings, and W-phase windings are sepa...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a simple method for determining the phase sequence and a method for determining the corresponding relationship between the phase sequence and the encoder, aiming at the problems of the prior art stator winding phase sequence detection method being complex, inaccurate and poor in accuracy and its detection device

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