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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...
This paper introduces an optimal design procedure for an in-wheel interior permanent magnet synchronous motor (IPMSM) to achieve wide speed range. For algorithms, the Kriging model based on the latin hypercube sampling (LHS) and genetic algorithm (GA) are applied. The optimal model has an increased wide speed range with reduced cogging torque.
This paper deals with optimum design criteria of miniature type linear servo motor of precise pick & place module for cogging force reduction using response surface methodology (RSM) & finite element method (FEM). The focus of this paper is to find a design solution through the comparison of cogging force according to core shape variations. And then, a central composite design (CCD) mixed...
This paper deals with the design comparison of two type BLDC motor for the electric power steering, which are a surface mounted permanent magnet motor and an interior permanent magnet motor.
This paper introduces an optimal design process enable the optimized spoke-type interior permanent magnet synchronous motor (IPMSM) to effectively reduce the cogging torque by considering the torque and efficiency by maximum torque control. In the optimal design process, response surface method (RSM) combined with moving least square method (MLSM) and genetic algorithm (GA) were used. Furthermore...
A novel coefficient modeling for skewed PM and overhang structure as a coefficient estimation method is introduced for optimal design in the 2D region for a PM motor. The novel model is constructed using 3D FEM and a response surface method (RSM) based on moving least square method (LSM). Then the novel model is coupled with an additional approximated model for optimal design in the 2D region. Finally,...
This paper deals with the shape optimization of the BLAC motor, in order to reduce its cogging torque. The motor type is an interior permanent magnet motor, and the motor is designed for an electric power steering system application. In this application, a motor cogging torque is one of the most important parameter, and the shape optimization to reduce the cogging torque of the BLAC motor is accomplished...
In this paper, the design method of minimizing the cogging torque for the Interior Permanent Magnet Motor(IPM) is proposed by using the hybrid algorithm. The suggested optimization algorithm is conducted by combining Response Surface Method(RSM) and Improved Simplex Method. The result shows the improved characteristics compared to conventional methods, such as the shorter calculation time and the...
A proposed novel double-barrier design with single-layer IPMSM is well proved to be effective for reducing pulsation torque, torque ripple and cogging torque, in published work, in which the torque characteristics be sensitive to the unique "connected" double-barrier structure is generally studied. This extended paper presents a few specific models for examining the effect of design variables...
This paper deals with the design process of brushless dc (BLDC) motor considering with the magnetization process included the skewed magnetizing fixture. The optimal design is also conducted to compensate the reduced back-EMF due to the skewed PM. The BLDC motor is designed by the loading distribution method and the skewed PM is analyzed 3D FEM. In addition, to reduce the simulation time of 3D FEM,...
This paper proposes a multi-objective optimal design process for an in-wheel permanent magnet synchronous motor (in wheel PMSM) for high performance. In order to improve the characteristics of the PMSM such as the cogging torque, torque ripple, the average torque and the back-EMF, the modified Taguchi method and the response surface method (RSM) are utilized. The optimal solution at the global scope...
This paper presents a statistical approach to the reduction design for cogging torque in a BLDC motor. In the approach, the finite element method, the numerical optimization technique, and the response surface methodology are effectively introduced. Additionally, the proposed approach provides the effective information to design engineers. Finally, the validity of this paper is verified by test.
Cogging torque results from the interaction of the rotor magnets acting on the stator teeth or poles independent of any current. It is desirable to reduce the cogging torque since it may cause speed ripple and vibration, particularly at light load and low speed. When the motor equipped ring magnet, it is very effective to reduce the cogging torque as changing only the magnetization patterns of the...
This paper presents flexible flux-barrier designs in an interior permanent magnet synchronous motor (IPMSM) for driving compressor in hybrid electrical vehicle. A conventional single-layer IPMSM model, a popular double-layer IPMSM model and a proposed novel double-barrier IPMSM model are built and optimized for improving torque performance by reducing cogging torque and torque ripple. The novel double-barrier...
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