Direct-current series motor controller with energy feedback function

Abstract

The invention discloses a direct current series motor controller with an energy feedback function, and belongs to the technical field of power electronics and motor control. The circuit comprises a full-bridge circuit, a follow current circuit, a digital controller and a gating drive circuit. The digital controller generates a corresponding PWM pulse signal according to a control strategy; and the gate control driving circuit is used for controlling the on-off of the semiconductor switching device. A mechanical switch is replaced by the electronic switch, non-contact smooth commutation of the direct-current series excited motor is realized, the torque and the rotating speed of the motor are adjustable, in addition, shunting of feedback current of the armature winding and the exciting winding is realized through the follow current circuit, and the stability of the motor is improved. Therefore, the freewheeling current flowing through the freewheeling diode is reduced during commutation or fault protection of the direct-current series motor, the speed regulation performance of a speed regulation system of the direct-current series motor is further remarkably improved, the energy density of the controller can be improved, the reliability and stability of the controller are enhanced, and the service life of the controller is prolonged. And the motor dynamic performance and the motor control system operation efficiency are improved.

Description

technical field [0001] The invention belongs to the technical field of power electronics and motor control, and relates to a DC series excitation motor controller with energy feedback function. Background technique [0002] The invention belongs to the technical field of power electronics and motor control. With the development of power electronics technology, new topology and new algorithm are widely used in the field of motor control. The DC series motor has the advantages of large starting torque, strong overload capacity, good speed regulation performance, and mature control technology. At present, there are two commutation control methods for DC series motors, one is to use electromagnetic reversing contactors to realize commutation control, but this method has the following problems. First of all, the switching frequency of the electromagnetic reversing contactor is not high, which makes the control dynamic performance poor and cannot realize fast and high-frequency c...

AI Technical Summary

Problems solved by technology

In order to realize the freewheeling current of the armature winding and the field winding during commutation, a freewheeling diode is set in this topology, but the current of the armature winding and the current of the field winding pass through the freewheeling diode at the same time during commutation, so that under heavy load conditions due to Excessive current is easy to damage the freewheeling diode

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