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13th May 2013, 06:18 PM #31
Hi Steve,
Sounds like things are moving in the right direction..
I guess you are using a clamp meter, if so, can you see the drop in current when the start winding cuts out?
The reason I ask, is that maybe the centrifugal switch isn't working, and it's staying on the start winding.
Regards
Ray
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13th May 2013, 06:23 PM #32SENIOR MEMBER
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something seems strange there to me ?
7amps x 240 V = 1680 watts / 746 watts = 2.25 HP
but then again I am mathematically challenged
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13th May 2013, 06:23 PM #33SENIOR MEMBER
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Hi Ray,
Good point.
I have a clamp meter but it decided not to work.
I used a Fluke DVM.
You can hear the switch close as the motor stops. It spins up too quick to hear it open.
I've been doing some Googling.... 7A at 220V is about right for a 1 HP motor, so it looks like 9A at 240~ 250V is about right.
Steve
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13th May 2013, 06:26 PM #34SENIOR MEMBER
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13th May 2013, 10:39 PM #35GOLD MEMBER
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14th May 2013, 07:51 AM #36
If its any help I've just amp clamped my 1hp lathe motor. At switch on the current jumps to around 12/13 amps and drops back to just a little under 9
amps no load. Using a killowatt meter it shows 780 watts and 244 volts. It didn't change much when I ran the spindle, but I wasn't cutting metal.
Regards:
BaronJ.
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14th May 2013, 10:38 AM #37SENIOR MEMBER
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14th May 2013, 11:08 AM #38GOLD MEMBER
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14th May 2013, 12:56 PM #39SENIOR MEMBER
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Thanks Jack and Eskimo, I have just had a bit of a read about phase shift, resistance, capacitance, back emf, impedance ect........ and now that I have warped back from the matrix I think that I'll just stick to turning switches on and off
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17th May 2013, 08:20 PM #40SENIOR MEMBER
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I've just had another attempt at finding a reference to such a motor and have found this:Electrical Diagram for a CSIR Motor
This is VERY similar to the motor I am playing with.
Don't know why I couldn't find it before.............Must have used different wording in Google.
Steve
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