Press Releases

Enhanced Control Performance when Operating Permanent Magnet Synchronous Motors without a Sensor

Drive Amplifier SD2/SD2S Provides Automatic Winding Detection

SIEB & MEYER has implemented a new feature in the successful drive amplifier generation SD2/SD2S. The devices now come with a "winding detection". This function improves the control performance significantly since the permanent magnet synchronous motors are operated with the actual motor data.

"Sensorless vector control of permanent magnet synchronous motors is significantly relies on the electrical key data of the used system, such as motor inductance and resistance", Torsten Blankenburg, CTO at SIEB & MEYER, explains. But parameter setting is usually based on the theoretical motor data which is not necessarily accurate: "Due to the scattering during manufacturing processes the actual data can differ significantly from the theoretical data." In order to avoid this error source the Lueneburg based company has implemented an automatic winding detection in the drive amplifiers SD2 and SD2S: With this function the motor inductance and the motor resistance are measured during the initialization of the rotor position. Then, the according parameter values are automatically corrected.

In addition, the winding detection provides a plausibility check for the operation of different spindles by one drive amplifier – the system checks that the selected parameter set corresponds with the connected motor. The reason: Especially in tool grinding machines the processing spindles are often exchanged or switched during operation. The winding detection aids this work flow by detecting mismatches between spindle and parameter set at an early stage.


SD2/SD2S with automatic winding detection in tool grinding machine

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