Method for determining initial position of permanent magnet motor magnetic pole through incremental encoder

Abstract

The invention provides a determination method used for determining the initial position of a permanent magnet motor magnetic pole by adopting an incremental encoder, relating to a control method used for precisely determining the initial position of the motor rotor within 60DEG of electric angle when an incremental encoder servo system is started; the method aims at solving the problem that the initial position of the magnetic pole can not precisely determined when the existing permanent magnetic motor adopts the incremental encoder to start. The method collects the once jumping information of Hall signals U, V and W when the rotor runs by less more than 60DEG of electric angle, utilizes the relationship between the feedback information of the incremental encoder of the system and the reverse electromotive force phase and the symmetric structural and electric relationship between the multi-polar motor to achieve the precise positioning of the magnetic pole, and converts the electric angle between the position where the jumping event occurs to Hall signals U, V and W and the Z signal position into the line-number relationship of corresponding incremental encoder, so as to control the running of the motor by pulses A and B output by the incremental encoder and plays an important role on AC servo products which require stable starting process.

Description

technical field [0001] The invention relates to a control method for accurately determining the initial position of a motor rotor within an electrical angle of 60 degrees when a servo system equipped with an incremental encoder is started, and belongs to the technical field of motor control device manufacturing. Background technique [0002] When performing servo control on an AC permanent magnet synchronous motor, the controller controls the vector direction of the stator three-phase current synthetic magnetic field. In order to effectively control the stator magnetic field vector, accurate measurement of the rotor position is required. Usually an economical and effective method is to install an incremental encoder on the motor rotor, and use the number of encoder output pulses to represent the change of the rotor position. But in this method, the control computer of the controller needs to obtain the initial position of the rotor first, and then determine the direction of...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the current permanent magnet motor cannot accurately determine the initial position of the magnetic pole when starting with an incremental encoder, and to provide a method for determining the initial position of the magnetic pole of the permanent magnet motor using an incremental encoder

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