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A novel doubly salient permanent magnet motor named flux switch permanent magnet motor (FSPM) was designed and analyzed. The stator and rotor of FSPM are all salient structures. There are a marked verge domino effect and serious saturation phenomenon. Due to high nonlinearities of FSPM, finite element method (FEM) was used to analyze magnetic field distribution, permanent magnet flux linkage, electromotive...
The flux-switching permanent magnet (FSPM) machine exhibits competitive torque capability and power density due to the high flux density. As a penalty, the cogging torque is relative large, resulting in unfavorable torque pulsation. Due to the simple and robust rotor construction, additional dummy slots are adopted to reduce the cogging torque without skewing magnets or teeth. The optimal dimensions...
For satisfying the requirement of high performance motor used in modern precise direct drive numerical control (NC) rotary table, a dual-rotor permanent magnetic synchronous motor (PMSM) with series structure and phase-shifting winding is designed in this paper. The series structure induces the magnetic fields of the inner unit motor and the outer unit motor to rotate synchronously, so the synchronous...
The doubly-salient permanent magnet (DSPM) motor employing straight rotor and concentrated windings is conventionally operated by means of current chopping control in constant-torque region and angle-position control in constant-power region due to the trapezoidal back-EMF waveform. However, the rotor-skewing method can be used to improve back-EMF and inductances waveforms to be sinusoidal significantly...
Permanent magnetic synchronous motor (PMSM) is often the most important element in precision machine tools as the direct dive motor and also a frequent source of vibration and acoustic noise. So this type of PMSM needs smooth rotation with low cogging torque in order to precise localization. This paper presents a general proposal to optimize the performance of an asymmetric PMSM using finite element...
This paper presents a method to reduce the cogging torque of PM BLDC with concentrated windings by combining teeth notching and rotor magnets skewing. For motors with concentrated windings, the method of reducing cogging torque by skewing rotor magnets is not quite available because of the large slot pitch. Then the method of teeth notching is also introduced in. The number of notches that should...
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