Micro Permanent Magnet DC Motor
The first Prototype of motor in the world is permanent magnet motor, but because the permanent magnetic materials that time with poor performance, so electromagnetic motors have been accounted for the mainstream. The birth of alnico permanent magnet made the permanent magnet motor to start the advent of development, but because of its relatively high price, so Alnico permanent magnet motor’ application surface is not wide. Since the emergence of low-cost ferrite permanent magnet motor, the application of permanent magnet motor has increased substantially, the application fields of the motor from toys, video motor, and micro motor vehicle to a small power-driven industrial and servo drives. According to statistics, the DC motors below 500W accounts for 92% of the permanent magnet motor, most of which is ferrite permanent magnet motor. Ferrites is still in use today, but because of its minor magnetic properties, and are not suitable for the needs of high-performance motor, Which appeared rare earth samarium cobalt permanent magnet in the 20th century, its maximum energy is four times as Alnico. The emergence of samarium cobalt permanent magnet made high-performance servo motor to be achieved.
