Single Phase Induction Motor

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Anonymous Poster	Single Phase Induction Motor 11/26/2007 8:17 AM
	Is it necessary of capacitance in 1 phase induction motor. Actually it is used to provide two phase at starting time. If starting winding and running winding difference in phase angle,starting winding(only inductor)provides two phase in single phase induction motor.
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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: Single Phase Induction Motor 11/26/2007 8:42 AM
	Quite so. __________________ "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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HUX Power-User Join Date: Jan 2007 Location: UK S.Northants Posts: 485 Good Answers: 19	#2 Re: Single Phase Induction Motor 11/26/2007 10:18 AM
	yes and once running the single-phase-produced field is distorted by the induced field in the rotor thus providing the means to continue rotation. In the old days it was necessary to start some motors rotating (by hand or other means) before energizing the stator windings.
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Andy Germany Guru Join Date: Sep 2006 Location: Near Frankfurt am Main, Germany. 50.390866N, 8.884827E Posts: 17996 Good Answers: 200	#3 In reply to #2 Re: Single Phase Induction Motor 11/27/2007 4:17 AM
	Thats when you have no cap......which in some motors single phase motors (not all) it is called the starting cap..... __________________ "What others say about you reveals more about them, than it does you." Anon.
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waterlucky Associate Join Date: Nov 2007 Posts: 26	#4 In reply to #2 Re: Single Phase Induction Motor 11/27/2007 10:50 PM
	so..u mean if i use a single phase motor (lets say a drilling press).. i need to built a capacitor to it? If so, is there any electronic way or electronic capacitor or stator that can serve this purpose? thanks.
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Andy Germany Guru Join Date: Sep 2006 Location: Near Frankfurt am Main, Germany. 50.390866N, 8.884827E Posts: 17996 Good Answers: 200	#5 In reply to #4 Re: Single Phase Induction Motor 11/28/2007 2:52 AM
	Single phase INDUCTION motors generally need a cap to get started. If there is another method (other than spinning by hand first) I am personally not aware of it. Other motor types are available that start without such capacitor help, the universal motor for example is one....... Why the aversion to a starting cap? In some S.P.I. motors they stay in circuit and give extra power... __________________ "What others say about you reveals more about them, than it does you." Anon.
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Andy Germany (2); HUX (1); PWSlack (1); waterlucky (1)

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