Hello, I have recently built DC motor which suppose to run at Minimum
5000 RPM under 10 Foot-LBS torque when 27 VDC applied per specification. But my motor run at 4800 RPM. I need to know what factors could cause the RPM to drop?Thanks, Mike
Is your motor running a load at the stated RPM?
A freewheeling motor, i.e. no load can turn faster.
Do you know your mechanical load is actually 10 foot-pounds @ 5000rpm?
Do you know there is actually 27Vdc at the machine terminals _when running_? Is the voltage from a clean source?
You have not supplied much detailed information necessary to get a good answer. Your best bet is to hire an electrician experienced with a dc motor or a PE EE. One guess is that your field current is too high.
Measure current in the armature. That should give a decent idea of what the torque is.
Bill
-- Ferme le Bush
PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.