PWM- DC speed Motors

Thread Starter

Tree1

Joined Nov 30, 2010
46
Suppose there are two DC motors controlled by PWM designed for the same application but they are made by different companies. One motors starts to limit its voltage and current draw after 67% duty cycle while the other continues to respond to increases in duty cyle. What could be the issue with other one? Less efficient circuity ?? Different transistors ??

Kindly advice someone..Thanks!!
 

GetDeviceInfo

Joined Jun 7, 2009
2,192
Sounds like one has a current limit that is set lower than the other. Current limit typically prevents currents above some reference. This does not imply a change of efficiency with the onset of limiting action.

You would compare the drives output ratings as a comparison. Voltage as a match to the motors needs, current as a matter of power output. Adjustability in regards to ramps/spd or current limit/compensations/braking/etc. need to be evaluated on a 'as required' basis.
 
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