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Torque ripple and acoustic noise are two major drawbacks to switched reluctance motors. The abrupt change of phase current is main cause of acoustic noise, while both commutation and current wave shape are two major factors contributing to high torque ripple. In order to simultaneously reduce torque ripple and noise, a specific current modulation based on real inductance profile can be employed to...
This paper deals with the optimum design of permanent magnet assisted synchronous reluctance motor (PMA-SynRM) for power improvement. The focus of this paper is found firstly a design solution through the comparison of torque density and d, q-axis inductance according to the rotor magnet and flux barrier shape, secondly, a mixed resolution with central composite design (CCD) is introduced and analysis...
An analysis model is proposed to investigate the effects of parameters on efficiency and power factor of induction motor in field weakening operation, considering the influence of magnetic saturation. The field oriented control and maximum torque per ampere control strategy are adopted for the steady state performance calculation in the field weakening region. Based on the comparison by variations...
This paper shows how to maximize the effect of the slanted air-gap structure of an interior permanent magnet synchronous motor with brushless field excitation (BFE) for application in a hybrid electric vehicle. The BFE structure offers high torque density at low speed and weakened flux at high speed. The unique slanted air-gap is intended to increase the output torque of the machine as well as to...
This paper presents a high speed SRM(Switched Reluctance Motor) with variable air-gap to produce a constant and flat-top torque with self-starting performance. In order to improve the efficiency in high speed, two-phases with two rotor poles structure is selected. The proposed 4/2 high speed SRM is designed for unidirectional rotating air-blower. The rotor poles are optimized to reduce torque ripple...
This paper describes about a designed axial type Switched Reluctance Motor (SRM) which intends to improve the output torque characteristic. The axial type structure has some advantages. One of the advantages is an increasing air gap dimension. Because the air gap dimension of the axial type motor is depended on the radial length, while an air gap dimension of the radial type motor is depended on the...
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