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This paper examines the torque ripple variation of surface mounted PMSMs with distributed windings and large number of slots per pole. The effect of established cogging torque reduction methods such as magnet step skewing, stator dummy slots and magnet pole shaping on the torque ripple variations and magnetic flux production is investigated, as these methods address the same factors that influence...
This paper investigates what effects different cogging torque reduction techniques, have on the cogging torque waveforms and air-gap flux density of surface mounted PMSMs with distributed windings and large number of slots per pole. Methods such as magnet step skew, stator teeth dummy slots and magnet pole shaping are the main scope of the paper, as they do not result in unwanted rotor unbalances...
In this paper, a segmented-stator linear vernier permanent magnet machine (LVPMM) is proposed for syringe pump systems. The proposed machine adopts segmented-stator linear vernier machine configuration. The mover is sandwiched between the segmented stators. By using the sinusoidal shaped magnets, the harmonics of the back electromotive force is reduced. By selecting an appropriate slot-pole combination...
This paper deals with the optimization of a single side Axial Flux Permanent Magnet machine (AFPMM) designs with respect to cogging torque. Although the AFPMMs run generally at high speed and high torque, these machines may run at lower operational speed for aircraft applications. At lower operational speed, the cogging torque is an undesirable effect. Firstly, a reference AFPMM is designed with Finite...
This paper extends an analysis developed for double tubular Halbach permanent-magnet motors to account for the thrust fluctuation associated with the primary design parameters of linear motors. Established by equivalent magnetic circuit method (EMC), the air-gap magnetic field distribution, provides an accurate means of predicting the cogging force that results from end effects. Comparison shows that...
We are aiming to develop a high precision micro-milling machine with a high speed spindle which is driven by a permanent magnet motor and supported by active magnetic bearings. The torque ripple, however, has influence on the positioning accuracy. As a first step of this study, we investigate torque ripple reduction of a permanent magnet motor. This paper considers optimal winding arrangement of a...
Magnetic gears are able to transmit torque between an input and an output shaft without mechanical contact. As for electrical drives, torque density, acoustic noise and torque ripple are of primary concern. This paper describes the influence of the pole numbers on the radial forces and the cogging torques. We show how continuous and discrete skewing can suppress torque harmonics effectively. Further,...
Interior permanent magnet motors (IPMMs) are increasingly popular in many applications for all power ranges due to their high torque density, high efficiency and wide operating range [1]. In particular, the spoke-type IPMM has relatively high torque density benefiting from the permanent magnet (PM) flux concentration. However, it has drawbacks such as a serious distortion of airgap flux density distribution...
Cogging torque is a major concern in permanent magnet (PM) motors, and some people have done many works on it [1], [2]. Magnetic wedge application for axial flux machine is mentioned in [3], but different with pre-formed radial flux PM machines, the tooth width of that machine is constant in the direction of the flux. In high power electrical machines with integral-slot distributed-winding, parallel...
The reduction of cogging torque in Permanent Magnet Brushless DC (PMBLC) Motor is very essential for high performance applications. This paper investigates on the development of a design which reduces the cogging torque to an optimum level. For this purpose, a comparative analysis on the conventional cogging torque reduction techniques as well as that of relatively new design techniques is analyzed...
In this paper, to decrease cogging torque and operating torque ripple, a barrier was installed on the rotor. Also, optimized design was carried out by Design Of Experiment(DOE) and various characteristics including torque were studied by the Finite Element Method(FEM). The modal analysis of the stator was performed and the natural frequency was calculated. The analysis of displacement by the Radial...
In this paper, a permanent magnet actuator with two degrees of freedom is analyzed. The actuator can provide rotation and translation independently controlled. Additionally, passive gravity overcompensation is included in the actuator, i.e., during power down conditions, the translator will be at rest in its upper position. The different aspects of this actuator are described and a prototype is designed...
Mechanical work usually has adverse effect on magnetic properties of soft magnetic materials. It reduces saturation magnetic flux density, decreases drastically magnetic permeability, widens hysteresis loop and decreases magnetostriction coefficient which leads to less strain under certain magnetic field intensity. This paper presents a practical way to improve magnetic properties of low-carbon steel,...
Hysteresis influences on the detent torque in permanent magnet motor are described physically. Although there are many methods to simulate hysteresis effects, most studies are focusing on loss calculation and very few papers discuss and simulate detent torque. Based on an improved interpolation method, the four-quadrant hysteresis effects are considered in cogging torque finite element simulation...
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