The newly developed PM motor auto tuning function of the FR-A800 is suitable for operation with permanent magnet (PM) motors and induction motors from a wide range of manufacturers .

The FR-A800’s PM sensorless vector control makes it suitable for accurate and stable transport between machines to deliver a precision work piece, such as a printed substrate, to a precise position. Transfer of fragile glass substrates can be performed with a highly accurate driving system.

What is a permanent magnet (PM) motor?

A PM motor is a synchronous motor with strong permanent magnets embedded in its rotor. The two major PM motor types are: the interior permanent magnet (IPM) motor with its magnets embedded inside the rotor, and the surface permanent magnet (SPM) motor with its permanent magnets attached on the rotor surface.

What is PM sensorless vector control?

The speed and magnetic pole positions, the two essential bits of information to control a PM motor, are detected without a sensor (encoder). The speed detection internally-performed in an inverter enables highly accurate control of a PM motor, almost as accurate as an AC servo system, without the need of a sensor/encoder (speed fluctuation ratio: ±0.05%-digital input).

Benefits of sensor/encoder-less motors

– Simplified maintenance

– No additional cables means less wiring space required.

– Improved reliability is obtained in unfavourable operating environments. (e.g. high vibration)

– PM motors are usually smaller and lighter than induction motors.

Mitsubishi FR-A 800 inverters with discounted prices at 999 Inverters