Permanent magnet brushless direct current motor equipped with magnetic encoder

Abstract

The invention discloses a permanent magnet brushless direct current motor equipped with a magnetic encoder. The permanent magnet brushless direct current motor comprises a machine shell, a control electric board, a rotor and a stator, wherein the control electric board is fixed in the center of the inner side of the front end cover; a magnetic encoder chip is arranged in the center of the control electric board; the rotor comprises a central rotary shaft and a rotor disc; a cylindrical permanent magnet is embedded in the center of the front end of the central rotary shaft; the front end plane of the cylindrical permanent magnet is close to and not fitted with the magnetic encoder chip; four Hall sensors, distributed around the circumference, are arranged in the magnetic encoder chip; two opposite Hall sensors are connected together by an encoding circuit through a corresponding differential amplifier; each analog-digital converter converts analog signals into digital signals and noise is filtered out by a corresponding digital filter; and then a digital signal processor is connected for processing so as to obtain an angle and magnitude. The permanent magnet brushless direct current motor is simple in structure, convenient to assemble, efficient and reliable, and effectively improves recognition accuracy on the rotor angle; and in addition, the magnetic encoder has the characteristics of vibration resistance, corrosion resistance, interference resistance and the like.

Description

technical field [0001] The invention relates to a permanent magnet brushless DC motor with a magnetic encoder, which belongs to the technical field of motors. Background technique [0002] A permanent magnet brushless DC motor is a DC motor with a magnetic field established by one or more permanent magnets. It is similar in structure to a brushed motor, and also has a rotor and a stator. The difference is that the rotor of a brushed motor is a coil winding, and a power output shaft Connected, the stator is a permanent magnet; the rotor of a brushless motor is a permanent magnet, connected to the output shaft, the stator is a winding coil, and the commutating brush used to alternately change the electromagnetic field of the brushed motor is removed, so it is called Brushless Motor. The brushless motor relies on changing the alternating frequency and waveform of the current input to the stator coil to form a magnetic field that rotates around the geometric axis of the motor a...

AI Technical Summary

Problems solved by technology

[0003] The existing permanent magnet brushless DC motor recognizes the rotor position through the Hall position sensor on the control circuit, and the recognition accuracy is not high enough, so the torque generated by the alternating current on the stator coil is unstable, and it is prone to jitter at low speed, and the speed is relatively high. Can't recognize even when it's fast

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