Yun-chul Jung

Single phase switched reluctance motor for vacuum cleaner

Universal motors are mainly used for vacuum cleaner application. There is a lot of research on SRM applied to home appliances throughout the world. The manufacturing cost of SRM drive makes it hard to expand its application to home appliances. This paper presents a single phase SRM for a vacuum cleaner that has cost merit and good performance respectively compared to a conventional universal motor. This paper proposes a new power device driving scheme by using SRM switching characteristic. The driving scheme is very simple and inexpensive. It uses dwell time control method for the minimum switching loss of power device. The switching speed of power device is less than 4.5 kHz at 45000 rpm. By use of this scheme, a power device based on very small switching losses can be used on an SRM drive. Also, the biggest problem in single phase SRM is starting, this paper shows a new starting algorithm with two Hall sensors, accelerating and running sensors, respectively. Finally, the proposed single phase SRM achieves higher efficiency and long life time compared to a universal motor. Its life time is more than 1500 hours, its life time is extended 4 times compared to that of a conventional motor and its suction power is increased 20% at the same volume of a conventional universal motor.

High efficiency and low-cost switched reluctance motor for air-conditioner blower

To date, induction motors have mainly been used for heating, ventilation and air conditioning (HVAC) applications, however there is significant research being done world-wide on the use of switched reluctance motor (SRM) in home appliances. So far the electronics cost of SRM drives makes it uneconomical to expand their application to home appliances but it is the objective of this paper to present SRM for use as air-conditioner blowers with both cost merit, and good performance expectations compared to conventional induction motors. This paper proposes a new power device drive scheme using SRM switching characteristics which is both simple and inexpensive. It will also adopt the dwell time control method for minimum switching of the power device. By use of this scheme, SRM drives can be fabricated with rugged power devices incurring very small switching losses. Furthermore, the control method shows a very robust and reliable drive even in cases of torque disturbance or overload condition without current sensors. This SRM design also adopts a bobbin type winding and printed circuit board (PCB) connection between bobbins, which includes a single rotor position sensor assembly. This production method reduces winding time by half compared to conventional winding process. Acoustic noise is a potentially severe problem with SRM depending upon the home appliance application. This problem is remedied by the mechanical structure and control algorithm. Additionally, the proposed SRM achieves a 15% higher efficiency with lower cost, compared to the conventional use of induction! motor And lastly, the SRM can be fabricated to be 20% more compact, and run with a wider speed range than conventional motors.