| Summary: | 碩士 === 國立交通大學 === 電機與控制工程系所 === 95 === Today, the application of the motor is diverse such as robot arms, electric vehicles, radio control (R/C) models, and etc. However, the brushless DC motor, BLDC motor in brief, is utilized popularly because of its high toque and maintenanceless. To drive the BLDC motor, the Hall-effect sensors located inside the motor are traditionally used to detect the rotor position and deliver the information to the controller. However, the sensors will increase the volume of the motor and may cause damage while rotating in high speed and in high heat environment. Thus, a sensorless method is proposed recently to avoid the use of these sensors. This thesis realizes a sensorless drive for the BLDC motor on the powerful F2812 DSP board by implementing the position estimated method, which computes the back-EMFs from the feedback of the terminal voltages of BLDC motor. The speed of the motor is able to be regulated by changing the duty ratio of the input PWM signals. Additionally, an open-loop start-up procedure is adopted to fulfill the rotation from standstill to a fixed speed.
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