Can anyone help me with a formula for % torque of a dc motor. The application is a extrusion machine with a dc drive powering the motor. My customer needs to display the % torque of the output shaft of the motor/gearbox. Any help or suggestions would be appreciated.
DC motor torque % formula
- Thread starter bwiring
- Start date
adisharr
Member
On the motor datasheet / nameplate, you should see a rated speed and current draw. I don't do much with large DC motors but with smaller units (< 1.5HP), at 100% of the rated current draw, the motor will output 100% of the rated torque.
DickDV
Member
It is assuming the field current is held constant at full nameplate current. Then shaft torque is directly proportional to Armature Amps with full load nameplate amps being 100% and Full Load torque being calculated from nameplate hp and nameplate base speed.
Highland Controls
Member
I am going to assume there is a DC drive running the motor. You should be able to set up an analog output to give you torque. You might even be able to directly access that parameter from the HMI via comms.
widelto
Member
Have you checked your DC drive specs, maybe it has a torque output. Hope you're not using field weakening.
widelto
Member
please see attached figure
This is what I talked about ,one of your DC drive analog analog outputs can be configured for torque display. This case is a poweflex DC dive, please check yours. That output can be connected to your PLC.
This is what I talked about ,one of your DC drive analog analog outputs can be configured for torque display. This case is a poweflex DC dive, please check yours. That output can be connected to your PLC.
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