Motor Power Factors

2 comments

Rate

biswanath.das Power-User Join Date: Oct 2006 Location: Kolkata, India Posts: 447	Motor Power Factors 02/24/2009 11:35 PM
	Can anyone write back if Starting PF & No Load PF of Motor is same with detail clarification. __________________ BNDas
	Register to Reply

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!

Electron Plumber Associate Join Date: Feb 2009 Location: Bluegrass Country of Kentucky Posts: 29 Good Answers: 1	#1 Re: Starting PF & No Load PF of Motor 02/25/2009 9:30 AM
	No, they are not the same. A motor can have a varying power factor. The starting power factor on an standard induction motor will be the same for locked rotor power factor. No load power factor is when there is no load on the shaft. Both can be low, but they will not be the same. A motor sees its best power factor at its full load rating by design. __________________ Joe the Electrical Contractor to the EOR, I know it was suppose to be in my base bid, but I still am going to submit a change order for it.
	Register to Reply Score 1 for Good Answer

CJMcGill Guru Join Date: Jul 2008 Location: SoCal USA Posts: 556 Good Answers: 23	#2 Re: Starting PF & No Load PF of Motor 02/25/2009 11:50 AM
	Power factor is not a static value. It states the timing relationship between the voltage and the actual current flow, which fluctuates wildly at times. Especially when starting a motor, which actually reverse generates as it begins to rotate, and reaches rated speed when the forward/reverse values equalize. Keeping it simple. CJM __________________ I do not 'know it all', but i will admit that I would like to. CJM
	Register to Reply Score 1 for Good Answer

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!

You might be interested in: Motor Test Equipment, Motor Repair Services, DC Motor Drives

	Got Something to Say?
	Ask a Question Start a Discussion

	Aerospace
	BioMech & BioMed
	Chemical & Material Science
	Civil Engineering
	Communications & Electronics
	Education and Engineering Careers
	Electrical Engineering
	General Discussion
	Instrumentation
	Manufacturing
	Mechanical Engineering
	New Technologies & Research
	Software & Programming
	Sustainable Engineering
	Transportation

	Site Directories
	Forum Directory Blog Directory User Group Directory RSS Feeds CR4 Rules of Conduct CR4 FAQ Site Glossary Who's Online (107 right now) Show Members