The earliest used motor in the world
The world’s earliest Prototype motor is permanent magnet electrical motor, but because the performance of permanent magnetic materials in that time was poor, 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, the application surface of Alnico magnet motor is not widespread. Since the emergence of low-cost ferrite, the application of permanent magnet motor substantially increases. According to statistics, among DC motor below 500W, the permanent magnet motor accounts for more than 92%, most of which is ferrite permanent magnet brush motor. The emergence of samarium cobalt permanent magnet makes high-performance servo motor to be achieved.
