6 | Project configuration STOBER
56
05/2019 | ID 442790.01
6.3 Motors
During the project configuration for motors, note the framework conditions described below.
Rotational motors (Lean motors, synchronous servo motors, asynchronous motors, torque motors)
The maximum possible motor speed is limited to 20000rpm.
The following relationship applies:
Rotating magnetic field frequency = Motor speed × Number of pole pairs ÷ 60
Since the output frequency f
2PU
can be a maximum of 700Hz, the motor speed can only be reached if the calculated rotating
magnetic field frequency is less than f
2PU
.
The specified torque/speed curve or the nominal points can only be reached in vector control if field weakening operation
is not in effect. Theoretical field weakening operation begins when a voltage is required for the speed (speed × KE constant)
that is greater than the available DC link voltage. In practice, however, field weakening must begin before reaching this
voltage limit (control reserve).
You define the voltage limit in B92. The default value is 80%.
Note that the field weakening is always active for Lean motors (B91 Field weakening = 1: Active). The voltage limit preset in
B92 is 95% for Lean motors.
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