Question:
How can it be achieved that in case of an automatic rotor position adjustment with a 9300 servo controller the motor shaft is stopped completely after a sudden change of position so that the rotor position adjustment can be executed correctly?
Answer:
If the motor shaft is not stopped completely during the rotor position adjustment and possibly even oscillates, the injected motor current can be reduced in order to reduce the oscillation excitation.
The motor current height during the rotor position adjustment is derived from the rated motor current C0088 entered. In order to reduce the motor current during the rotor position adjustment, C0088 is therefore to be reduced temporarily. The correct value is to be reset after the adjustment.
The maximum current setting under C0022 has no influence!
Rotor position adjustment sequence:
During the rotor position adjustment (activation via code C0095) the rotor of the synchronous machine is 'attracted' approx. every 2 seconds in succession by several stator magnetic fields defined by the 9300 controller. As a result, the position feedback is referenced to the software side field orientation of the control. The position between the individual measuring steps changes suddenly. Especially in case of larger, low mass inertia synchronous motors the rotor may be excited to oscillate that strongly that it does not stop between the measuring steps.
Consequently, it is not possible to clearly determine the rotor position. As a result, the drive performance deteriorates and may depend on the direction of rotation. If the rotor position is set correctly, the drive performance does not depend on the direction of rotation.
