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This paper presents a brushless DC (BLDC) motor drive with direct torque control (DTC).The detailed hardware and software design are analyzed and designed. The performance of the BLDC employing DTC is compared with that of BLDC utilizing PWM current control. A prototype of BLDC motor drive based on the DSP controller with DTC control is implemented and validated by the exhibition of waveforms measurement for currents, torque, flux linkage, and speed. The experimental results not only verify the feasibility of designed system but also demonstrate that BLDC with DTC control has superior characteristics than that with PWM current control.

The design practice and simulation as well as implementation of a flyback converter are presented in this paper. Detail design considerations for each component in flyback converter are addressed and discussed. Based on the simulation results, a flyback converter is then realized and implemented. The experimental results show the verification for the design and implementation of the flyback converter. This paper concludes that the design of a flyback converter based on the proposed design practice, can reduce the development schedule duration and further alleviate the human resources need.