winding resistance of large motor vs small motor

by knight92
Tags: motor, resistance, winding
knight92 is offline
Jan12-12, 09:09 AM
P: 31
Hi guys, I ran a large DC motor and a small DC motor for 5 minutes at max voltage/max speed. Took the readings for before running it and after running it and somehow the smaller motor after five minutes of running at max volt/max speed has more than twice the winding resistance where as the larger motor's winding resistance stays almost the same ? The smaller motor had more winding resistance to start with anyway, why is that ? (The max volt for both motors is 15volts but one is a high and the other is a low power motor)

I dont understand why something like this would happen I ran them in the same room and probably the same room temperature.
Phys.Org News Partner Science news on
SensaBubble: It's a bubble, but not as we know it (w/ video)
The hemihelix: Scientists discover a new shape using rubber bands (w/ video)
Microbes provide insights into evolution of human language
pantaz is offline
Jan13-12, 03:06 AM
P: 586
Measure the temperature of the motor before and after.
knight92 is offline
Jan13-12, 06:51 AM
P: 31
Well I dont have access to the motors anymore, it was in a lab session I do remember touching them and felt the same temperature but not sure.

Register to reply

Related Discussions
Motor winding problem please help me..? Electrical Engineering 1
DC motor armature winding question Electrical Engineering 8
ceiling fan motor winding Mechanical Engineering 0
generator or motor winding Electrical Engineering 5
Motor winding? Electrical Engineering 2