A permanent magnet motor (PMM) is a type of brushless electric motor that uses permanent magnets attached to the rotor, maintaining the electromagnetically powered stator.
A permanent magnet motor is more economical, with greater energy efficiency, reduced electrical losses, lower operating current and less heat generation than a conventional induction motor (IM) of the same horsepower rating.
For similar power levels, a permanent magnet motor has higher power density per length, making it shorter and lighter than conventional motors.
The advantages of a permanent magnet motor include better efficiency, higher power factor performance and compactness. On average, the permanent magnet motor uses 20 percent less power than the induction motor.
Permanent magnet motors need to be operated with a different type of control for variable speed drive and require matching transformers for high frequency applications.
