In this article,the author analyzes the cause of the wrong design of one kind of perpetual motion machines of the first kind,which is based on the principle of capillary phenomenon.

New types of technique based on such factors,such as special permanent-magnet motors and automatic voltage regulation transformer for beam pumping units,ultra-low speed motors,were tested in 497 oil wells.

And the permanent-magnet motor becomes the most compose of electric propulsion by its advantage.

The structure and characteristics of the PM motor of outer-rotor were introduced,and the space vector control system was designed,using the high performance DSP.

Application of sensorless permanent magnet motors to variable-frequency air conditioners;

Cogging torque is one of the main concerns of permanent magnet motor.

An analytical technique by way of partial differential equations is presented in this paper to analysis the magnetic field in air gap of the surface mounted permanent magnet motors.

Due to the special construction of magnetic pole, the permanent magnet starter motor with auxiliary pole has the advantages of high starting torque, high no-load speed, and low cost of magnetic pole, as compared to the ordinary permanent magnet starter motor.