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The main target of this paper is optimizing the slot-opening shift for cogging torque reduction in BLDC motors. In a slot-opening shift method there is no skew, therefore the known drawbacks of the skewing is prevented. In the first part of the paper the slot-opening shift method for a BLDC motor is discussed. In this case, it is desired to find a method for cogging torque reduction without deteriorating...
Cogging torque is one of the important issues for permanent magnet machines. Due to the interaction between the permanent magnets and slotted armature lamination, there exists cogging torque in slotted permanent magnet machines, which may cause noise and vibration. To reduce the cogging torque, the expression of the cogging torque was studied based on the Fourier analysis in this paper. Based on the...
In a permanent magnet machine cogging torque is produced due to the interaction between the rotor magnets and the slots and teeth of the stator. This paper is a result of an ongoing research work that deals with reduction of cogging torque in dual-rotor radial flux permanent magnet generator (DRFPMG) for direct coupled stand-alone wind energy systems. The DRFPMG is an existing machine design. Two...
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...
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...
Based on the characteristics of transverse flux permanent magnet machine (TFPM), a novel multi-pole and multi-phase TFPM topology with assembled stator and concentrated flux rotor is presented in this paper. The associated electromagnetic fields of the prototype are investigated by means of three dimension equivalent magnetic network method (3DEMNM). It is shown the unique multi-phase structure of...
Great emphasis is paid on transverse flux permanent motors (TFPM) in recent years especially in powerful propulsion system. However, the cogging torque in TFPM leads to mechanical vibration and noise inevitably. This paper presents a new TFPM with combined stator and concentrating flux rotor configurations. The related design parameters that reduce the cogging torque are investigated by using equivalent...
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