No abstract

No abstract

The main theme of this paper is to present the laboratory course modular design for learning and hands-on magnetic components in power converters. The objective of the course is to give the students to model the converters, realize magnetic components and test the implemented converters via the hands-on work in order to improve practical skills of students under the insufficiency of regular course training. This designed course is based upon the modular concept of five modules in common use which include forward converter, flyback converter, push-pull converter, half-bridge converter and full-bridge converter. The controllers for these converter modules include voltage mode control and peak current mode control. The specifications for each converter module are the same, 48V/12V, 60W and 100 kHz of switching frequency. The designed modular curriculum has been applied to the Industrial Technology Research and Development Master (ITRDM) Program sponsored by the industry and government. And excellent acknowledgment from students is received for providing practical training and covering the wide range of magnetic components in power conversion applications.

This paper presents a novel high frequency driven induction motor. Its rotor conductor structure, which has only single-phase winding, is different from the squirrel-cage rotor. Its single-phase short-circuit rotor windings exhibit different inductance distribution at different rotor position corresponding to stator winding. This phenomenon is similar with the reluctance machine. In order to start and operate the motor, position sensors are attached at the rear of motor to help the driver commutate the stator windings. In addition, a high frequency capacitor is connected between stator winding and driver to form a resonant loop. A phase-lock-loop circuit controls the output frequency of the driver so that the resonant current flows through stator winding is constant. It must be operated at high frequency over 10KHz. Basic principle of the high frequency induction motor is introduced. Its operating principle and control are similar with the reluctance motor. The difference is that it produces repulsive force between rotor and stator poles but the reluctance motor is attractive. Compared with the traditional induction motor, it can reduce acoustic mechanical vibration by driving at near ultrasonic frequency range.A three-phase 12-poles prototype was implemented. Experimental results show that the practical usage of the theory.

No abstract