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This work deals with the influence of magnetic saturation on machine parameters of a surface mounted permanent magnet synchronous machine driven by an ideal six-step three-phase inverter. In this third part, a special attention is given to each torque component on load condition, i.e., mutual torque, reluctance torque, cogging torque and a comparison between the electromagnetic torque and the summation...
One of the important objects in Submarines is reducing or eliminating acoustic noise, where results Submarines hidden from scopes of enemies. BLDC motors are used in submarines, and Cogging torque and unbalanced magnetic forces in BLDC motors are important source of acoustic noise. This paper is a study on the Cogging torque for BLDC motors, with 14 poles and 12 slots. Cogging torque is calculated...
This paper depicts an enhanced Particle Swarm Optimization (PSO) algorithm for Brushless DC Motor (BLDC) design. The algorithm is applied to shape optimization of a 120 W BLDC motor using a multiobjective optimization problem. While the objectives are maximization of average torque and minimization of cogging torque in the BLDC motor, magnet length, air gap and stator slot opening are considered as...
This paper presents the optimum design for outer rotor brushless dc motor. The purpose of the research was to obtain optimum design for the DC motor with low level cogging torque. First, the simulation using was carried out using Ansys software to investigate the limit of number of rotor and stator of 90 mm diameter motors. Effect of the slots number on cogging torque was studied by variations in...
The cogging torque is undesirable effect in the brushless dc (BLDC) motor, causing vibration and audible noises.It arises from the rotor permanent magnet interacting with the steel teeth on the stator. Therefore, this paper studies the various reduction methods of cogging torque when designing a BLDC motor. These methods can be categorized according to three parts of motor structure, i.e., air gap...
This paper presents the optimal design of a surface mounted permanent-magnet (PM) Brushless direct-current (BLDC) motor meant for spacecraft applications. The spacecraft applications requires the choice of a motor with high torque density, minimum cogging torque, better positional stability and high torque to inertia ratio. Performance of two types of machine configurations viz Slotted PMBLDC and...
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 presents the design and analysis of a zero cogging halbach array permanent magnet Brushless DC motor (PMBLDC) meant for spacecraft applications. The design of the zero cogging BLDC motor requires the choice of slotless configuration. Three types of machine configurations, Slotless PMBLDC with radial, parallel and halbach magnetization were compared and analyzed using analytical models....
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 method to reduce the torque ripple of a square wave voltage-driven BLDC motor. First off, this paper reviewed an existing voltage control method to reduce torque ripple, and confirmed through it that cogging torque component still remains. And this paper proposed an improved voltage control method to offset cogging torque components. Analysis was done by using FEM model, and...
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.
This paper presents the improvement of dynamic characteristics in interior permanent magnet (IPM) type BLDC motor with notch. The notch is applied on the surface of the rotor to reduce the cogging torque and to improve dynamic characteristics. The current, inductance and torque of initial model and optimal model are analyzed by FEA. The validity of improved dynamic characteristics is confirmed.
This paper deals with a design to improve operating characteristic of spoke type BLDC motor. By reason of variation magnetic field, cogging torque is generated. Cogging torque of Spoke type motor is bigger than other type permanent magnet motor. So, this paper presents a design notch on stator and variation rotor shape to reduce cogging torque of Spoke Type motor. Through Fourier formulation of magnetic...
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