F UTURE W ORKS

In chapter 3, the linear Hall sensor produces an output signal which is proportional to the intensity of the induced rotor field. However, due to the phase lag caused by feedback filter, the phase current and back-EMF can not be perfectly in phase though the Hall signals which is used for command reference. This phenomenon will also exist in the sensorless control system in chapter 4. So, this may be lower the overall efficiency. To solve the problem, an auto phase tuning mechanism can be introduced to decrease the phase differences between phase current and back-EMF, and consequently increase the efficiency.

In recent years, FPGA-based hardware implementation technology has been used to motor control systems due to the advantages of their programmable hard-wired feature, fast time-to-market and reusable IP (Intellectual Property) cores. Besides, the FPGA-based system can get a very high speed level, since it can carry out parallel processing by means of hardware mode. Therefore, a fully digital control IC with or without Hall sensor can provide a simple and feasible solution for single-phase BLDC fan motor drives

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