Switched reluctance speed-regulating motor controller for electric pick

Abstract

The invention discloses a switched reluctance variable speed motor controller for an electric pick. The controller is characterized in that a main circuit power source and control power source power supply part, a power switch bridge and drive circuit, a current sampling and isolating amplification circuit, a position signal processing circuit, a logic control circuit and a protecting circuit are included. The controller is reasonable in structure, and work performance is good.

Description

technical field [0001] The invention relates to a controller for a switched reluctance speed-regulating motor for an electric pick. Background technique [0002] In order to increase the power density of the motor and reduce the labor intensity of the operator, hand-held electric tools need to be small and light, so high-speed motors are often used to drive them. At present, most of them use single-phase series-excited motors, and a few use single-phase Medium frequency induction motors and permanent magnet brushless DC motors. The load characteristics of single-phase series-excited motors are very soft, the speed is high at no-load or light-load, and the noise is large. Due to the existence of brushes and commutators, they are often worn or burned in actual use. cause malfunction. The speed regulation of the induction intermediate frequency motor is difficult, the torque is very small at low speed, and the speed regulation performance is not good. Although the permanent ...

AI Technical Summary

Problems solved by technology

The load characteristics of single-phase series-excited motors are very soft, the speed is high at no-load or light-load, and the noise is large. Due to the existence of brushes and commutators, they are often worn or burned in actual use. cause failure

The speed regulation of the induction intermediate frequency motor is difficult, the torque is very small at low speed, and the speed regulation performance is not good

Although the permanent magnet brushless motor has high efficiency, because the performance of the permanent magnet in the motor is greatly affected by temperature and vibration, the motor is limited in high temperature and high vibration applications, especially not suitable for high impact strength such as electric picks power tools

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