Functional description
The sensorless control of synchronous motors is based on a decoupled, separate control of the torque-generating and the field-generating current proportion of synchronous motors. In contrast to the servo control, the actual speed value and the rotor position are reconstructed via a motor model.
The operating mode is subdivided into two ranges:
1. Open-loop controlled operation
In the range of small speeds, it is not possible to monitor the actual speed of the synchronous motor. Thus an adjustable constant current is injected.
2. Closed-loop controlled operation
In this range, the position of the rotor flow and the speed are reconstructed by means of an observer. Control is effected in a field-oriented manner. Only the current required for summoning up the required torque is injected.
Which products are concerned?
8400 HighLine with firmware from V10.00
8400 TopLine with firmware from V01.10
Applications
In the fields of materials handling technology, pumps and fan technology, or for simple positioning applications, encoderless permanent magnet synchronous motors can now be used. Compared to the asynchronous motor, which is mainly used in these applications, a better energy efficiency can be achieved.
