Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

interior permanent magnet machine
a permanent magnet machine in which the permanent magnets are buried in the rotor iron. With this construction the airgap is small, allowing the airgap flux to be reduced by current control. This allows an operating mode in which the top speed of the motor can be as much as five times the base speed, and is one of the main features of this motor.