motor

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Sohail Shahid Member Join Date: Aug 2008 Posts: 5	motor 08/04/2008 4:48 AM
	for a motor, can it b possible that input power is greater than output power??? i m mechanical engg i dont know about electrical
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: motor 08/04/2008 4:50 AM
	Input power is always greater than useful output power for all real-world energy conversion devices. There is always an element of waste. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Sohail Shahid Member Join Date: Aug 2008 Posts: 5	#2 In reply to #1 Re: motor 08/04/2008 4:52 AM
	do u think it is hysteris, wire losses etc
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TVP45 Guru Join Date: Jul 2007 Posts: 4448 Good Answers: 143	#3 In reply to #2 Re: motor 08/04/2008 5:28 AM
	Take an ordinary electric motor that has been running under load for several minutes. Put your hand on it. What do you feel? Input energy - useful output energy = thermal energy Most of the thermal energy is due to I²R losses, some due to hysteresis and eddy currents, and a small amount due to em radiation. __________________ "Well, I've wrestled with reality for 35 years, Doctor, and I'm happy to state I finally won out over it." Elwood P. Dowd
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JohnDG Guru Join Date: May 2006 Location: Reading, Berkshire, UK. Going under cover. Posts: 9684 Good Answers: 468	#4 In reply to #3 Re: motor 08/04/2008 6:14 AM
	Also a bit of heat due to friction. Some energy also lost as acoustic noise/vibration etc. __________________ "Love justice, you who rule the world" - Dante Alighieri
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Oriole Participant Join Date: Jul 2008 Posts: 2	#5 Re: motor 08/04/2008 6:36 AM
	If you discover your motor having more output power than input power, run to the patent office with your invention...
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JRaef Guru Join Date: Sep 2006 Location: California, USA, where the Godless live next door to God. Posts: 4665 Good Answers: 804	#6 In reply to #5 Re: motor 08/05/2008 2:29 PM
	Better yet, send it to me, I'll take care of those pesky little details for you __________________ All I every really wanted to be, was... A LUMBERJACK!.
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JohnDG (1); JRaef (1); Oriole (1); PWSlack (1); Sohail Shahid (1); TVP45 (1)

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