Torsional Driving Torque

Torsional Driving Torque

The Torsional Driving Torque and Load Torque are used for torsional startup analysis. It is known that the synchronous motors produce oscillating torques with excitation frequency equal to twice the slip frequency during startup and they can cause serious failure if the system is not properly designed. Induction motors also produce the oscillating torques at start; however, the torque amplitude exponentially decays and the excitation frequencies are equal to the line frequency and twice the line frequency. The data fields are self-explanatory. The synchronous speed (rpm) can be automatically calculated by specifying the number of poles or can be input independently if the driver is not a synchronous motor.

For synchronous motor

For induction motor

For GE Power motor

See other Torsional/Axial Data Torsional/Axial Data.