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Old 12-18-2006, 09:30 PM
 
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Question Help wiring a synchronous ac motor?

I bought from a surplus yard a (Estern Air Devices) EAD synchronous ac motor. It has 5 leads, all cut off, no terminals no capacitor :
Black
Yellow
Green
Red
White

Nameplate says:
VOLTS 220/240
HZ 50 PH1
AMPS .76
CAP 5.0 UF 220VAC
RPM 750/1500
DUTY CONT

Can someone please help me in wiring connection to AC mains?

I want to use this motor to replace the one on a small 9" woodworking bandsaw in order to reduce its induction motor speed for cutting metal. Right using it as is, cutting AL is OK but will feel more comfortable with a reduced speed.

Michel
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Old 12-18-2006, 11:17 PM
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Check to see if it is just two separate windings, for e.g. is the green a ground, if you have two windings, they possibly are the same resistance, if so you should be able to connect one winding across the 220, and the other winding connect the cap in series with it, and connect the series'd cap and motor across the 220, to reverse dir., reverse the connection of either winding.
I don't believe you will have the power to operate a bandsaw, it appears very small fractional HP.
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Old 12-19-2006, 05:25 AM
 
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Thanks Al for your quick reply
Made a quick check no lead is a ground.
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Old 12-19-2006, 06:12 AM
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That is a 2 speed motor by the specs. You probably have 2 main windings and one start winding.

Darek
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Old 12-19-2006, 11:27 AM
 
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2 main windings: makes 4 leads
and one start winding: 2 leads
All together 6? Got only 5.
Am I missing something?
How to idendify them?

Thanks, Michel
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Old 12-19-2006, 11:38 AM
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What type of Synchronous motor is it? does it feel like a stepper motor, when you turn it over is there heavy resistance felt?
Al.
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Old 12-19-2006, 11:47 AM
 
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No resistance at all. Nothing like a stepper feeling
Turning it by hand is smooth
Michel
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Old 12-19-2006, 12:13 PM
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This is my guess.

Darek
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Old 12-19-2006, 12:33 PM
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That could be, but I am puzzled how they attain synchronism?
Is it separate exitation? or Variable reluctance type?
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Old 12-19-2006, 12:37 PM
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I think this is single phase induction motor.

Motor can turn two speed and motor has auxilliary winding for starting.
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Old 12-19-2006, 12:48 PM
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Its obviously a 2pole/4pole motor, but it is not just an induction motor it a synchronous one, which means it should have a separate field produced either externally by DC or internally by shaded pole or other means, in this case, Which?
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Old 12-19-2006, 01:14 PM
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Here is a couple of pages of the company web site, if you have a model number there is the hook-up sheets available.
http://www.eadmotors.com/pdf/ACmotors_Nov04.pdf
http://www.eadmotors.com/getcad.asp?...filesize=1203k
The one I show appears to be non-synchronous.
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