First off you may wish to correct this thread's titleto vary the speed of dc motor without varying its speed
The required input power will be a function of AV (i.e. 'speed'), load and efficiency --- I'm uncertain as to your meaning with 'not vary the power'...i want to vary the speed of a dc motor without varying its power
Plzz explain your problem better (whatever plzz means ).Hi,i am an engineering student i want to vary the speed of a dc motor without varying its power. Plzz help me!!
@narinder kaur -- Pursuant to the above - Please consider, for instance, a 'phase control' circuit but employing an SCR (as opposed to a triac) as the power switching device... Be advised, however, that a (monopolar) PWM controller is the standard (and, in most applications, optimal) approach...Pulse width modulation allows you to control the 'speed' of a motor without changing the voltage by changing the duty cycle - but in an AC setting. If you use an ac power source and a filter circuit (Google is your friend) to prevent it from dipping below 0V, you might have some luck.
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