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Title: Implementation of Mechanical Sensorless Control of BLDC Motor with Back EMF methods in DSP
Authors: Gashaw, Tilahun
Advisors: Mengesha Mamo (Dr.)
Keywords: BLDC
Back EMF,
Copyright: Mar-2011
Date Added: 6-May-2012
Abstract: ABSTRACT BLDC motor has trapezoidal shape Back EMF. This Back EMF signal has a direct relation with supplied voltage, position and speed of the rotor. BLDC motor is suitable for Back EMF based mechanical sensorless control application, and it is found in home appliance, medical equipment, electronics equipment, and in electrical vehicles. Back- EMF based mechanical sensorless control of BLDC motor offers both technical and economic benefit that reliability of the system increases, weight reduces, results in compact drive system, and it eliminates mechanical position sensors which are expensive than small power BLDC motor. This Thesis deals with the control simulation and development of a low budget mechanical sensorless brushless dc motor. The transfer function of the system is derived from the a-b-c reference frame mathematical model of the motor. Speed and current controller parameters are tuned for the motor. The three terminal voltages of the motor are used to determine the back EMF values. Therefore, the commutation sequences of the inverter are obtained from the Back EMF waveform. The system model is simulated with SIMULINK/MATALB. Electronic sensor and other hardware components are designed and built. Machine language software program are developed for TI LF2401A DSP .Finally partial experimental setup is assembled and tested.
URI: http://hdl.handle.net/123456789/2730
Appears in:Thesis - Electrical Engineering

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