A novel wound field flux switching machine with salient pole rotor and nonoverlapping windings

Abstract

A flux switching machine (FSM) with a segmented rotor and nonoverlapping windings is an attractive alternative for driving high torque density applications. However, a rotor with segments makes the motor less robust as well as difficult to be assembled, while a FSM with salient rotor and overlapping windings inherits high copper losses and less efficiency due to high coil volume. In this paper, a novel structure of FSM with nonoverlapping windings and salient rotor is proposed, making it different from the 10Slot-8Pole segmental and salient rotor FSM. Several design parameters defined in the rotor, armature coil, and field excitation coil are treated by the deterministic optimization approach until the target values are achieved and the performances are analyzed by two-dimensional finite element analysis. The optimized design has achieved average torque of 27.06 Nm and power of 6.83 kW at armature current density, Ja , of 30 A rms /mm 2 and maximum field current density, Je , of 30 A/mm 2 , which is greater than the 10Slot-8Pole segmental rotor and salient rotor FSM. Wound field FSMs with salient rotor and nonoverlapping windings should be considered as promising candidates for hybrid electric vehicles and all-electric boats due to their high torque density, robust rotor, and fewer losses.

Outer rotor wound field flux switching machine for In‐wheel direct drive application

“…Whereas, S1 and S2 are the depth and width of rotor pole, respectively. Deterministic optimization technique (single variable optimization) is applied to achieve targets requirements [4]. In deterministic optimization technique, the air gap and slot area of armature coil and FEC are kept constant while a free parameter is changed.…”

“…Due to these features, DC machines are unfavourable for HEVs. SRM has robust structure and no permanent magnet but the use of SRM causes problems of acoustic noise generation and ripples in high torque [4]. PMSMs have high torque and better efficiency but they have demerits of demagnetization, complex structure which is difficult to optimize and permanent magnet cost issues.…”

Partitioned Stator Switched Flux Machine: Novel Winding Configurations

“…HESFMs are more attractive in the research community due to; (a) high speed and greater torque density (b) constant power at wide range of speed and (c) fault tolerant capability [10][11][12]. In literature, various designs of HESFMs are classified as parallel and series flux paths [13][14][15][16][17]. PM machines have drawbacks of saturation and mechanical limitations.…”

Modular Rotor Single Phase Field Excited Flux Switching Machine with Non-Overlapped Windings

“…At high speeds, universal motors cause noise due to their mechanical commutators, and they have a comparatively short maintenance period. To cope with these snags, research of a high-performance and low-cost brushless machine is greatly in demand [1,2] Switched-flux brushless machines, a new class of electric machine were first presented in the 1950s [3]. Flux switching machines (FSMs), an unconventional machine, originated from the combination of principles among induction alternator and switched reluctance motor [4].…”