| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 97 === Nowadays, most mobility scooters are equipped with the DC brush motor. This type of motor has mechanical structures such as stator permanent magnets, brush, and a commutator. Therefore, it has large start-up torque and is easy to control. However, this kind of mechanical commutation often leads to drawbacks such as low power density, low reliability, and difficulties to disburse heat. In contrast with the DC brush motor, the permanent magnet brushless motor (PMBLM) has high efficiency and does not need regular maintenance. Hence, PMBLM has great potential in becoming the power source for mobility scooters. In this thesis, the performance of the PMBLM with ideal trapezoidal and sinusoidal back-emf waveforms under rectangular and sinusoidal current drives is evaluated. To reduce the cost, low-resolution Hall sensors are used to implement the sinusoidal current drives. Both the Fourier analysis and experimental results indicate that the proposed hybrid rectangular and sinusoidal current operations can indeed improve the performance of the permanent magnet brushless motors under various driving strategies.
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