Design procedure of segmented rotor switched reluctance motor for direct drive applications

Abstract

Switched reluctance motors (SRM) are becoming increasingly popular because of the rising cost of permanent magnets. It was reported that segmented rotor construction improves the torque output and efficiency. This study discusses an SRM with segmented rotor construction designed for direct drive application. Such a motor has an outer rotor. It is found that in such machines, the torque output increases when there are higher number of rotor segments than stator poles. A segmented rotor SRM with 12 stator poles and 26 rotor segments is discussed here. It has unique pole tip shape, which improves torque output. Design procedure of the motor is presented. Moreover, limitations of segmented rotor SRMs having a higher number of rotor segments than stator poles are also identified, and possible solutions are suggested. Experimental results on the prototype of a three-phase 12/26 motor are presented.

Analysis of Midpoint Current Characteristics for Novel Six-Phase N+2 Power Converter in Different Working Condition

“…2 (f). The equations are similar to (4) and (5), just swap the position of the voltage and current of phase A and B.…”

“…Comprehensively considering equations (1) to (5), it can be ensured that the closer the values of iA and iB, the smaller the absolute values of iQ1 and iQ2.…”

“…In recent years, with the development of electric vehicles, new energy power generation, aerospace technology, requirements of larger capacity, higher reliability and better fault tolerance of the motor drive system are proposed [1][2][3]. Compared to the other motor types, Switch Reluctance Motors (SRMs) have some distinct features including simple structure, permanent magnet material needless, and these characteristics make SRMs have prominent advantages in applications requiring low cost, high reliability and wide speed range [4][5].…”

Switched Reluctance Drives with Degraded Mode for Electric Vehicles

“…This is particularly convenient for outer-rotor machines, usually used in in-wheel designs. In such case, a better performance is achieved if a segmented rotor topology is used [16]. Segmented rotor SRMs have a stator with full pitch coils and a rotor with discrete segments embedded in nonmagnetic material.…”

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