Limiting the motor power
Reduce the maximum output motor power according to the maximum permitted output torque on the gear unit (Mamax). For this purpose, you must first determine the maximum permitted motor torque (MMot).
You can calculate the maximum permitted motor torque as follows:
MMot | Maximum permitted motor torque | [MMot] = Nm |
Mamax | Maximum permitted output torque | [Mamax] = Nm |
itot | Total gear unit ratio |
|
ηtot | Overall efficiency | [ηtot] = % |
Use this maximum permitted motor torque MMot and the load diagram of the motor to determine the associated value for the motor current.
Take appropriate measures to prevent the continuous current consumption of the motor from exceeding the previously determined value for the motor torque MMot. A suitable measure, for example, is to set the tripping current of the motor circuit breaker to this maximum current value. A motor circuit breaker also offers the option of bridging a short-term overload, for example during the motor startup phase. A suitable measure for inverter drives is to limit the output current of the inverter according to the determined motor current.
