Design of three phase permanent magnet synchronous motor
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Date
2017-06
Authors
Khairul Ismadi Mohd Sukri
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Abstract
Three-Phase Permanent Magnet (PM) Synchronous Motors is the new type of synchronous motor that have been widely used in many applications due to its high efficiency and high power density compared to other conventional electrical motors. Therefore, it is important to design the optimum performance of PM synchronous motor. The 6-slot/4-pole PM synchronous motor with radial and parallel magnetizations are designed by using Finite element software and the electromagnetic characteristics of 6-slot/4-pole PM synchronous motor at noload and on-load conditions are obtained from Finite element software. The stator and rotor were constructed based on the analytical calculation of motor dimensions in order to achieve the optimum performance of PM synchronous motor. All the results obtained from simulation are compiled and analyzed. The electromagnetic characteristics and performance of the motor are the cogging torque, phase back-EMF, air gap flux density and electromagnetic torque. The phase back-EMF of the motors are computed further into its harmonic components in order to compute the total harmonic distortion in the phase back-EMF waveforms. From the result, the 6-slot/4-pole PM synchronous motor with parallel magnetization has the best electromagnetic characteristic due to its low peak cogging torque and low total harmonic distortion in phase back-EMF. The 6-slot/4-pole PM synchronous motor with parallel magnetization is further optimized by reducing pole-arc of the magnets. As the result, the magnet pole-arc of 84° mechanical is chosen as the optimum magnet pole arc in 6-slot/4-pole PM synchronous motor with parallel magnetization due to low total harmonic distortion and low peak cogging torque compared to full pitch magnet pole-arc.