A Brushless DC Motor Speed Regulation Circuit Based on Chopper Technology

A brushless DC motor and chopper circuit technology, applied in starting devices, torque ripple control and other directions, can solve the problems of large size, high torque ripple and low reliability of the brushless DC motor speed control circuit, achieving The effect of reducing motor torque ripple, improving starting reliability and reducing starting current

CN107612434BActive Publication Date: 2019-06-25BEIJING MECHANICAL EQUIP INST

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: BEIJING MECHANICAL EQUIP INST
Publication Date: 2019-06-25

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Abstract

The invention relates to a chopper technology-based speed regulating circuit for a brushless DC motor. The chopper technology-based speed regulating circuit for the brushless DC motor comprises an input filter, a single-phase chopper circuit, a chopper filter circuit, a single-phase rectifier circuit, a buffer and discharge circuit, a three-phase inverter bridge, a DSP controller, an isolation signal conditioning circuit and a drive circuit. The DSP controller is adopted as a main control chip, so that a complicated software algorithm is not needed; voltage of the brushless DC motor is modulated by adopting the single-phase chopper circuit, so that over-high inductance is not needed and the torque ripple of the motor is reduced; voltage reduction is carried out by adopting two stages of circuits of an AC chopper and the three-phase inverter bridge in the starting process, so that the starting current of the motor is reduced and the starting reliability of the motor is improved; and a protection signal can be output to protect a control circuit and the motor when an exception occurs.

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Description

technical field

[0001] The invention relates to the technical field of control circuits, in particular to a brushless DC motor speed regulating circuit based on chopper technology. Background technique

[0002] Brushless DC motors have the advantages of simple structure, small size, high power density, and high efficiency, and are widely used in various fields of the national economy such as national defense, aerospace, aviation, automobiles, and home appliances. With the emergence of permanent magnet materials and the rapid development of electronic components, permanent magnet brushless DC motors are more widely used, and small-volume, highly reliable brushless DC motor control circuits have become one of the key technologies for the development of brushless DC motors.

[0003] At present, there are mainly two types of brushless DC motor speed control circuits. The first type is the combination of uncontrolled rectifier circuit and three-phase inverter bridge circuit. The ...

Claims

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