SD2S: Automatic Winding Detection and New Drive Functions

Continuous Development of a well-proven drive amplifier

Over the past year SIEB & MEYER has developed the well-proven drive amplifier SD2S further: First the experts implemented the new function "Winding detection“. Second they added a drive function that permits 4-quadrant operation also for high-speed asynchronous motors with encoder feedback.

Sensorless vector control of permanent magnet synchronous motors significantly relies on the electrical key data of the used system, such as motor inductance and resistance. But parameter setting is usually based on the theoretical motor data which is not necessarily accurate. In order to avoid this error source the Lueneburg based company has implemented an automatic winding detection in the drive amplifier 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.

In addition, SIEB & MEYER has extended the manifold fields of application of the drive amplifier SD2S even further. Now the device can drive high-speed asynchronous motors with encoder feedback in real 4-quadrant operation. In the new application scenario SD2S convinces with a high-dynamic speed control including torque limitation. The latter allows the user, for example, to test different loads at a constant speed in test stations. Another new opportunity for machine tools with asynchronous motors is using high-speed manufacturing spindles as dynamic positioning axis via the CNC. The positioning accuracy depends on the encoder resolution which is limited by the motor speed. A SIN/COS encoder with 1Vpp signal or an encoder with TTL signal can be used as encoder system for this application. The higher-ranking CNC conducts the position control.

SD2S with the feature "winding detection"
The feature "winding detection" is of importance especially in tool grinding machines - it detects mismatches between spindle and parameter set at an early stage