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Parameterization Design and Research of Permanent Magnet Synchronous with Fractional-slot and Concen

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Tutor: ChengShuKang
School: Harbin Institute of Technology
Course: Electrical Engineering
Keywords: Permanent magnet synchronous motor,Fractional-slot concentrated windings,Flux we
CLC: TM341
Type: Master's thesis
Year:  2008
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Abstract:
In this paper, the structure, the performance characteristics and the parameters design of permanent magnet synchronous motor with fractional-slot concentrated windings have been analyzed.First, the technical feature of a permanent magnet synchronous motor with fractional-slot concentrated windings is studied. And then the motor models with different slot/pole combination were set up using finite element analysis software. Ensuring the same electrical performance and other conditions, a comparative analysis is simulated from the different aspects, such as the efficiency of the motor, the torque performance and demagnetization risk of the motor.The motor mathematical model is established from the torque characteristics, then several key parameters for the impact of low-speed torque performance is analyzed. The effect of stator split ratio, the series turns/phase and the permanent magnet parameters on the performance of torque is demonstrated in detail. For torque fluctuations, the pole shoe¡¯s shape optimization of the interior permanent magnet synchronous motor for the torque fluctuations is analyzed, and the prototype motor for example, illustrate how to design these electromagnetic parameters and optimize the pole shoe¡¯s shape to improve the torque performance at low-speed region.Flux weakening is a development bottleneck for a permanent magnet synchronous motor. Several important electromagnetic parameters were studied affecting the highest speed and power output capacity of the ideal motor. The permanent magnet flux and D axis inductance for the effect of the flux weakening is analyzed theoretically and simulated using the finite element analysis in detail. Considering the constraints problem between low-speed torque and the flux weakening capacity for the permanent magnet synchronous motor the parameters design method is proposed take into account the low-speed torque performance and the maximum speed.The D- and Q-axis inductances are key parameters for performance of a permanent magnet synchronous motor, and are also the difficulty of the motor design. The D- and Q-axis inductance forecast directly related to the motor control system performance. The key factor impact of permanent magnet motor inductance is analyzed using the finite element software, and the experiment is set up with the prototype motor. The finite element analysis results were compared with the experimental results.Finally, the prototype motor has been developed. Through the comparison of the experimental and the theoretical results, the error between the experimental and theoretical analysis is studied to demonstrate the effectiveness of the analysis method for permanent magnet synchronous motor with fractional-slot concentrated windings.
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