Information
Servomotor is the name given to special electric motors that allow control of the angular position of their motor shaft, as well as the speed of rotation and acceleration (torque). They consist of an electric motor which is additionally equipped with a sensor (e.g. encoder) for position determination. The rotational position of the motor shaft determined by the sensor is continuously transmitted to the control electronics, the so-called servo controller or inverter, which regulates the movement of the motor according to one or more adjustable setpoints – such as setpoint angular position of the shaft or setpoint speed – in a control loop.
Although this does not define the motor technology itself, the motor must be well suited for the task. Servo motors are for example: permanent magnet motors (left picture), synchronous reluctance motors (middle picture), both of which are also available in IEC designs, with the aim of achieving the greatest possible energy savings and small sizes, or in optimized designs, in order to achieve not only energy savings but also the greatest possible power/torque in relation to the frame size.
Furthermore, vector-controlled asynchronous motors (figure below) are also selected according to the control task.
For more information, please refer to the special pages on the individual motor technologies.
(picture left) Synchronous reluctance motor with forced cooling for demanding control tasks while maintaining very good efficiency (standard is IE4, Super Premium Efficiency).
(picture left) Vector-controlled servo motor with forced cooling (always provides optimum motor cooling regardless of motor speed).