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I need to know how to roughly get idea about indcutance value of ceiling pedestal single phase AC fan? I want to roughly model this.

winny
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Muhammad
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1 Answers1

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The overall inductance value of an induction motor –as typically used in ceiling fans– heavily depends on the slip.

At near synchronous speed (slip → 0), it's dominated by the field winding and for a 230V ceiling fan motor, roughly in the range of 300mH.

At standstill (slip → 1) it's dominated by the air gap and rotor magnetization which leads to an inductance of roughly 30mH.

Janka
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  • If I could upvote this twice, I would. “It depends”, “Why”, “read the datasheet” and “ask the manufacturer” are the usual but way less helpful answers here. When I was in university a fellow student of mine called a transformer manufacturer to get a good approximation of the nominal efficiency of a 1 MVA transformer. “It depends on what you design for” didn’t help him. – winny Jul 21 '19 at 13:24
  • @Janka ,thankyou very much for your valuable feedback...can i know resistance value of fan motor as well? – Muhammad Jul 21 '19 at 13:49
  • The equivalent resistance depends on the torque and thus power the motor has to overcome due to the mounted fan. So P=U²/R → R=U²/P. – Janka Jul 21 '19 at 21:16
  • It's the R part of Z. And no, you cannot measure it with an ohmmeter. That one gives you the resistance of the wiring. – Janka Jul 22 '19 at 02:20
  • @Janka,For case of pedestal fan/ceiling fan rated 230/240vac, 80 watts..then R=V2/P ,it will be Z? OR R? Secondly if i measure with ohmeter,then it will be correct R value of fan motor? – Muhammad Jul 22 '19 at 02:31
  • @Janka, I need t refernece somewhre in my report about vaule of indcutance quoted above..Can you share source or link etc that i can reference in my reportplease? – Muhammad Jul 22 '19 at 02:32
  • It was *rough values*, so I cited my own memory. Sorry. – Janka Jul 22 '19 at 02:53
  • Thankyou very much sir@Janka – Muhammad Jul 22 '19 at 03:06