Research on Switched Reluctance Type of Electromagnetic Speed Regulating Motor and Its PWM Control Method

Combining the advantages of switched reluctance motor and electromagnetic speed regulating motor, a new type of speed regulating motor, switched reluctance electromagnetic speed regulating motor (SR-EMSRM), is proposed. The prime motor drives the outer rotor to rotate (base speed) through the coupling, provides excitation current to the excitation winding of the outer rotor, and generates high efficiency reluctance torque on the inner rotor. Instead of the low efficiency eddy current torque of the traditional electromagnetic speed motor, it drives the inner rotor and the load to rotate, and the inner rotor speed can be lower than, equal to or higher than the base speed, with the advantages of stepless speed regulation, wide speed regulation range and fast response speed. The mathematical model of SR-EMSRM is established, the PWM control method is studied, and the simulation and experiment are carried out.

I. Introduction

Motor speed regulation is an important index to measure motor performance. In recent years, many factories and mining enterprises use traditional electromagnetic speed regulating motor or permanent magnet speed regulating driver for fans, pumps and shearer loads, because of its low technical requirements, low cost of use, durable, low requirements for the use of the environment, but because of its large loss of spin, serious heating, is an inefficient speed regulating method, in some application areas, Electromagnetic motor is replaced by frequency converter, but because of the high price of frequency converter and the existence of high harmonics and other adverse effects, the use of frequency converter is not the most ideal speed regulation scheme.