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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details.

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Old 18th Jul 2015, 7:42 pm   #1
radiozero
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Default Motor Start Capacitors

I have a vintage motor: A 1/6th HP Hoover motor type 411 GAR. Works off 230V or 240v.

It's a capacitor start and the value seems to be 120/145 uF.

As to the rating, the first figure is missing, but I'm guessing it says 370 Volts Surge. I would not think it would be 470V.

Okay, I'm assuming that a modern start capacitor rated at 280V is going to be okay.

Any insights on this? Thanks.
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Old 18th Jul 2015, 7:59 pm   #2
threeseven
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Default Re: Motor Start Capcitors

That seems a very high value for a small motor. The 1/4 hp motor on my bench pillar drill is 6uf and I've recently replaced it with a 250 vac cap and it's fine.
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Old 18th Jul 2015, 8:01 pm   #3
radiozero
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Default Re: Motor Start Capcitors

I think, not sure, a surge voltage might have been 1.25 times regular rating. If that is the case the regular rating would be 296V.
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Old 18th Jul 2015, 8:20 pm   #4
factory
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Default Re: Motor Start Capacitors

It does seem high, the start capacitor on the 1/4HP motor on my lathe is 40uF, it probably needs changing too as its the original TCC one. The voltage rating on it is 275Vac surge.

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Old 18th Jul 2015, 8:36 pm   #5
radiozero
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Default Re: Motor Start Capacitors

My Hoover motor was painted black. The TCC capacitor is originally black painted. Made in Mar 48. It looks original to the motor. Always a chance it's a replacement though, I guess.
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Old 18th Jul 2015, 9:11 pm   #6
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Default Re: Motor Start Capacitors

Is this motor cap start cap run?. 120uf is normal for high starting torque this cap will normally not be rated for the full peak to peak voltage, as soon as the motor is running at about 2/3rds of its rated speed this cap is disconnected by either a centrifugal switch or an electronic timer.
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Old 18th Jul 2015, 9:23 pm   #7
radiozero
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Default Re: Motor Start Capacitors

It's just a cap start motor. Has a centrifugal switch.
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