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When applying the permanent magnetic synchronous motors (PMSM) to refrigerant system, the suppression of speed ripples of the PMSM in low-feed range becomes the focus of consideration. The authors start with the generation mechanism and the periodical characteristics of the speed ripples to propose an adaptive control method. In the proposed method, the authors place a frequency variable resonance...
This paper introduces new PMSM with high dynamic performance, and its rotor structure adopts the optimal design which is made by holing rotor core and magnet shifting. This paper designed 7.5kw PMSM, which analyzes optimization design method and discusses effects on motor performance. FEA simulation results show that the new design rotor structure improved motor's dynamic performance, and reduced...
A novel variable structure active-disturbance rejection position controller of permanent magnet synchronous motor (PMSM) servo system is presented in this paper. Not only maintaining the original features of controller, but also reducing the adjustable parameters, based on the variable structure designing. Through the analysis of cross-axis output equation, proposing a new position variable structure...
A bearingless permanent magnetic synchronous motor (BPMSM) has combined the characteristics of a permanent magnetic synchronous motor and magnetic bearings. The rotor suspension force is closely related to the air gap magnetic field of the torque windings. So accurately getting the magnitude and phase of the air-gap magnetic field on the torque windings is the key to precisely control the levitation...
The permanent magnet synchronous motors are widely used in various industrial applications due to many advantages such as high power density, high efficiency, low manufacturing cost and so on, but cogging torque and moment of inertia are the most important factors affecting the performance and control precision. In this paper, firstly, the cogging torque can be effectively reduced by taking the auxiliary...
This paper describes the MTPA (maximum torque per ampere) control strategy of Salient-pole PMSM (permanent magnet synchronous motor) and its flux-weaking control strategy. Salient-pole PMSM often used the MTPA control strategy, the method that MTPA curves obtained from look-up table is usually used, but it will reduce the real-time performance and reliability of the system. In this paper, electromagnetic...
Two permanent magnet synchronous motors (PMSM) whose rotor magnetic circuit structures were radial and tangential were designed. vector potential and energy methods were used to calculate the electromagnetic parameters of the motors. Based on the mathematical model, the torque characteristics were calculated, control performances within constant torque and constant power control area were analysed...
The basic principles and optimization strategy of Gene Handling Genetic Algorithms (GHGA) was introduced in this paper. The mathematical model of optimum design of permanent magnet synchronous motor was established, and GHGA was applied to the optimum design of the NdFeB PMSM prototype, some corresponding curves about fitness changing with the generation were deduced. As optimal results, the cost...
High-performance motor drive applications require smooth torque with minimum torque ripple. Considering the structure characteristic of surface-mounted permanent magnet machine, this paper describes the causes of torque ripple of it. From a machine design standpoint, the paper has analyzed the reasons that cause torque ripple generated by the interaction between the motor current and harmonic back-EMF,...
This paper analyzed the no load air gap flux density waveform of surface mounted permanent magnet synchronous motor (PMSM) and then proposed a new method to improve the air gap flux density waveform. Multiple permanent magnets are adopted as a main pole for motor instead of a single one, and the mathematical model to eliminate the harmonics is derived. According to the mathematical model, a PMSM finite...
This paper mainly studies the performance of fractional slot/pole permanent magnet synchronous motor (PMSM) due to different winding layer and slot/pole combinations. According to the proposed 2D models of 18 slot/8pole, 18slot/16pole and 18slot/20pole PMSM with single and double layer winding, we can obtain the winding arrangement. We can also get torque ripple, cogging torque, back-EMF and magnetic...
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