S-PM series

S-PM motor is a synchronous motor incorporating a strong permanent magnet in the rotor.
It does not slip like an induction motor (which drops in rotation speed under increased load), making it suited for controlling speeds with high precision.
Additionally the rotor is the permanent magnet, so there is no secondary copper loss (rotor loss) as occurs with induction motors, and it maintains high motor efficiency.

Sensorless control is a method for controlling a permanent magnet motor by estimating the rotor position (magnet position) and speed in the drive unit instead of using a sensor (encoder). Speed can be controlled with high precision even without a sensor (encoder) thanks to the PM sensorless vector control equipped with Mitsubishi Electric’s proprietary adaptive magnetic observer (*1).

The adaptive magnetic flux observer scheme is a control method in which a virtual motor model is included within the drive unit and detects the speed and magnetic pole position within the motor based on its voltage and electric current.