Operation Method of Discrete Stepping Control for Permanent Magnet Brushless DC Motor

Abstract

The invention discloses an operation method for stepping dispersion control on a permanent magnet brushless direct current motor, and relates to a motor control technology. A device used in the method comprises a DSP (digital signal processing) control module, a power circuit, the permanent magnet brushless direct current motor, an encoder position detection module and an input power module. For the common three-phase permanent magnet brushless direct current motor, a stator current vector synthesized by three-phase current is dispersed and subdivided, and a dispersion positioning position in a space is obtained according to a certain cyclic number of beats, so that positioning control on the motor can be realized by controlling the space position of a stator magnetic field, and the positioning precision of the motor is improved; furthermore, the stator current vector synthesized by the three-phase current is dispersed at an electric angle space position according to a certain cyclic number of beats so as to obtain a dispersed current vector for controlling operation of the motor; by increase of the cyclic number of beats, a smaller stepping angle can be obtained, and the position resolution is improved; therefore, the positioning precision of the permanent magnet brushless direct current motor can be improved under the condition of guaranteeing the loading capacity.

Description

technical field

[0001] The technical proposal of the invention relates to a motor control technology, in particular to an operation method of discrete step control of a permanent magnet brushless DC motor. Background technique

[0002] A permanent magnet brushless DC motor is composed of a stator winding and a permanent magnet rotor without a commutator, and its control characteristics are similar to a brushed DC motor. Due to its advantages of large torque, high efficiency, high speed, simple control and easy maintenance, and with the development of power electronics technology, permanent magnet materials, digital electronics technology and new control theory, permanent magnet brushless DC motors are used in high The field of performance servo drives shows broad application prospects. The existing permanent magnet brushless DC motor uses Hall elements to detect the rotor position, adopts two-two conduction mode, and the commutation angle is 60°, which is equivalent to step...

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