Abstract
This paper presents a characteristics analysis and performance comparison of high-speed two-phase 4/2 and hybrid single-phase 4/4 switched reluctance motors (SRMs). Although the motors are advantageous as high-speed drives, both conventional structures have high torque ripple as a result of the presence of the torque dead zone. In this paper, solutions to the torque dead zone problem for each motor are discussed. For the 4/2 SRM, a wide-rotor stepper-type is adopted, while for the 4/4 SRM, the structure is changed to a hybrid by adding permanent magnets (PMs). Both motors have a non-uniform air gap to modify their inductance profile, which leads to the elimination of the torque dead zone. A finite-element method was used to analyze the characteristics of each motor. Then, the manufactured motors were tested through experiments, and lastly, their performance was compared.
Highlights
Nowadays, high-speed machines are utilized in a wide range of applications, and the interest in developing high-speed motor drives is growing
Switched reluctance motors (SRMs) have some advantages as high-speed drives because of their simple structure: they have no windings or permanent magnets (PMs) on the rotor, which contributes to a low rotor inertia and a relatively easy cooling compared to other motor types
They suffer from high torque ripple, vibration, and acoustic noise, which dominate as the main research topics for switched reluctance motors (SRMs)
Summary
High-speed machines are utilized in a wide range of applications, and the interest in developing high-speed motor drives is growing. Switched reluctance motors (SRMs) have some advantages as high-speed drives because of their simple structure: they have no windings or permanent magnets (PMs) on the rotor, which contributes to a low rotor inertia and a relatively easy cooling compared to other motor types. They suffer from high torque ripple, vibration, and acoustic noise, which dominate as the main research topics for SRMs. The pole and phase number of SRMs play an important role in determining their performance. There are some known pole number and phase combinations, such as three-phase
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