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Motor data and controller adjustments of the asynchronous motor
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 7.5 - 3
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7.5 Motor data and controller adjustment of the asynchronous motor
The asynchronous motor has two principally different modes of operation:
- V/F characteristic operation
V/f characteristic operation, with SMM (Sensorless Motor Management) for speed stabilisation and miscella-
neous current limiting protective functions
- Vector controlled operation
During vector controlled operation, current and speed are checked by PI controllers.
The controlled operation can be carried out with or without motor model:
- Vector controlled operation without motor model
This mode of operation must be used if the electrical parameters (e.g., inductance) of a motor cannot be
determined by automatic identification.
This operating mode always needs encoder feedback.
- Vector controlled operation with motor model
This operating
mode can be used if the electrical parameters of the motor can be determined ("identified")
automatically.
The advantage of this operating mode is a higher torque accuracy compared to the operation without motor
model.
Particularly important for the motor model is the main inductance. This must be calibrated by a ramp-up of the
motor without load torque. For the other data (stator resistance, rotor resistance, leakage inductance), values
from a motor data sheet can be used alternatively.
- Vector controlled operation with motor model without encoder feedback (ASCL)
During vector controlled operation of an asynchronous motor without encoder feedback (Asynchronous Sen-
sorless Closed Loop => ASCL), the speed is estimated with a mathematical model of the asynchronous
machine.
Standard version F5A does not contain operating mode ASCL. It needs the special software F5H.