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The finite element method (FEM) is presented in this paper to research the noise of axial flux surface mounted permanent magnet synchronous machine (AFSMPMSM), and the noise of AFSMPMSM is analyzed and calculated by using analyzing software of FEM. The two results of FEM calculation and sample machine's experiment are contrasted, and it is proved correctly of using this FEM to calculate the noise...
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...
To satisfy the requirement of the low speed high torque permanent magnet synchronous motor (PMSM) used in the precise numerical control (NC) rotary table, the multipolar PMSM with similar pole number and slot number and unequal teeth structure is designed in this paper. This kind of motors can operate with lower speed, and the structure of similar pole number and slot number can reduce its inherent...
In this paper, a study focus on cost reduction of magnet material by utilizing the structure advantage of rotor design in a single-phase line-start permanent magnet motor (LSPM) is presented. Base on a prototype LSPM having single-barrier rotor structure, a double-barrier IPM rotor design is adopted for saving the permanent magnet material and maintaining the main machine performances. The advantage...
Firstly, the topology and operation principle of the permanent-magnet BLDC motor for automatic door are researched in the paper. A method for decreasing cogging torque by cooperating of pole number and slot number is given. To increase the inner space utilization rate and the motor efficiency, the double-layer-and-short-pitch windings are employed. Secondly, taking terminal voltage as input, transient...
This paper deals with the core loss reduction according to the change of stator shape in an interior permanent magnet synchronous motor (IPMSM). The number of slots per pole per phase of the IPMSM is 0.5, and the tooth width and yoke thickness are chosen as design factors. According to the ratio of tooth width and yoke thickness, the core loss is analyzed under considering the rotating and alternating...
Thrust ripple, determined by the magnetic field, is a significant factor to affect the performance of linear motor system. This paper evaluates the effect of the two magnet shapes, rectangle shape and Halbach array, for the flat short secondary type permanent magnet linear synchronous motor (PMLSM). A novel design that makes the PM into a curved shape is presented. Then, each shape analysis is fulfilled...
If the air-gap is small, the computing error can be neglected when the conventional formulas are used to calculate the air-gap magnetic field. But they will result in a great error for the calculation of the air-gap magnetic field of a motor with a big air-gap. The magnetic potential superimposed method is hereby a more precise calculation solution for a motor with a big air-gap. The validity of the...
The armature reaction of brushless DC motors have important influence on magnetic field distribution, torque ripple, motor inductance and losses. The control mode of surface-mounted brushless DC motors make that the magnetic field circumrotates uniformly but jump every 60deg, and the different angles between stator and rotor magnetic potentials lead to the complexity of armature reaction. The armature...
Structure of motor can be designed variously according to necessary condition with the same torque and output power. Specially, characteristic of motors are varies according to selection of the number of poles and slots on the assumption that constraints of motor are the same. It goes without saying that is identity of pole and slot ratio. In this paper, it is comparative that are characteristics...
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...
In this paper, two emerging outer-rotor stator-permanent-magnet (PM) brushless motor drives, namely the doubly-salient PM motor drive and the PM hybrid brushless motor drive, are firstly quantitatively compared, which are particularly attractive for serving as in-wheel motor drives for electric vehicles. In order to enable a fair comparison, these two motor drives are designed with the same peripheral...
A line-start permanent magnet synchronous motor (PMSM) with solid rotor is developed and a method to study operating performance of this kind of motor is presented, in this paper. A 30 kW solid rotor PMSM with simply structure was taken as the analysis model, and the numerical calculation model under some assumptions, as well as the solving regions of the derived model, is proposed. By using improved...
There were many inherent advantages on multi-phase permanent magnetic synchronous motor (PMSM). Its prospect was very optimistic. A novel six-phase disc permanent magnetic synchronous motor was presented in this paper. There was a one-rotor-two-stators configuration in the motor. The principle and structure were depicted. Finite element method (FEM) was used to analyze the no-load magnetic field characteristics...
The detent force due to the interaction between the permanent magnets (PMs) and the teeth produces vibrations and noise. Especially, it deteriorates the low speed performances obviously and reduces the positioning precision. Based on the Fourier analysis of the detent force curve as a function of the motor position and initial phase angle of the harmonics of each pole, the detent force can be reduced...
Discontinuous primary permanent magnet linear synchronous motor (DPPMLSM) has many merits in long-stroke transportation, including vertical, horizontal, and slanted model system, however, detent force of DPMLSM is particularly troublesome requiring positioning accuracy specially at low speed region as well as of position control and is different from short primary type and short secondary type PMLSM...
In order to reduce the cogging torque, many methods have been advised and studied in permanent magnet(PM) motor. In this paper, the methods of pole arc coefficient of PM, armature teeth notching, PM shifting and different pole arc coefficient combination are studied and improved based on the analytical expression of cogging torque derived in this paper, and the methods to decide the design parameters...
In this paper, some important parameters of cylindrical linear Halbach arrays were presented mathematically and their effect on the field distribution was analyzed by the finite-element method. The results show that the number and axial length of magnet annuli per period have more effect on the field distribution and determine the field pattern in axial direction. With different topologies, cylindrical...
This paper gives the design and simulation of a permanent magnet synchronous motor (PMSM) for a super-high speed centrifugal compressor drive application. The PMSM has an output power of 2000 W at 200,000 rpm with 28 V dc power supply. It is designed for operation at a cryogenic temperature of 77 K. The designed PMSM is a 2-pole, 3-phase slotless structure. The permanent magnet is centrally located...
Experimental methods used recently by many researchers for the determination of PMSM parameters have been reviewed. Analysis and experimentations show many shortcomings and inaccuracies involved in those methods. Two novel techniques for better results through the application of linear regression and neural network are presented, and the results from these methods are also included. In addition, computational...
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