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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Need help wiring single phase motor
I picked up a single phase motor at a surplus shop and can't get it to
work correctly. It's a Bodine 120v, 1/3 hp gear motor, and does not have the start or run capacitors included. The model number isn't listed on Bodine's site so I'm guessing it's an old one or a special application model. It has four leads- white, red, blue, and ground. The brief 'instructions' from the surplus shop say to wire it "White to AC, Blue to Capacitor, Red to AC and Capacitor", but when I did this it only turned about 1/6 the listed speed. Can anyone tell what I'm doing wrong? Should the AC and motor leads go to the opposite sides of the capacitor? Thanks for any help. |
#2
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Need help wiring single phase motor
"Patrick C." wrote in message om... I picked up a single phase motor at a surplus shop and can't get it to work correctly. It's a Bodine 120v, 1/3 hp gear motor, and does not have the start or run capacitors included. The model number isn't listed on Bodine's site so I'm guessing it's an old one or a special application model. It has four leads- white, red, blue, and ground. The brief 'instructions' from the surplus shop say to wire it "White to AC, Blue to Capacitor, Red to AC and Capacitor", but when I did this it only turned about 1/6 the listed speed. Can anyone tell what I'm doing wrong? Should the AC and motor leads go to the opposite sides of the capacitor? Thanks for any help. Induction motors like to run just a bit slower than the synchronous speed. If it's starting at all and it isn't making loud buzzing noises, drawing excessive current, getting hot or letting forth smoke then the motor is hooked up correctly. Is the ID plate on the motor or the gearbox? Maybe someone replaced the original motor, and the listed speed is for another gearbox, or no gearbox? If the listed speed is 3600, 1800 or even 1200 RPM then chances are that's the motor shaft speed, not the output shaft speed. |
#3
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Need help wiring single phase motor
"Patrick C." wrote:
... Should the AC and motor leads go to the opposite sides of the capacitor? ... Yes, INDEED!! Going to the same side does nothing at all. Like this: ---------- White AC -| |--- Blue | | | --- Cap | --- | | |-----|--- Red |
#4
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Need help wiring single phase motor
"Tim Wescott" wrote in message ...
"Patrick C." wrote in message om... I picked up a single phase motor at a surplus shop and can't get it to work correctly. It's a Bodine 120v, 1/3 hp gear motor, and does not have the start or run capacitors included. The model number isn't listed on Bodine's site so I'm guessing it's an old one or a special application model. It has four leads- white, red, blue, and ground. The brief 'instructions' from the surplus shop say to wire it "White to AC, Blue to Capacitor, Red to AC and Capacitor", but when I did this it only turned about 1/6 the listed speed. Can anyone tell what I'm doing wrong? Should the AC and motor leads go to the opposite sides of the capacitor? Thanks for any help. Induction motors like to run just a bit slower than the synchronous speed. If it's starting at all and it isn't making loud buzzing noises, drawing excessive current, getting hot or letting forth smoke then the motor is hooked up correctly. Is the ID plate on the motor or the gearbox? Maybe someone replaced the original motor, and the listed speed is for another gearbox, or no gearbox? If the listed speed is 3600, 1800 or even 1200 RPM then chances are that's the motor shaft speed, not the output shaft speed. Sorry, should have included this the first time- It is getting hot and shutting off (lucky for me it has thermal protection). The nameplate speed is 180 rpm, and it's only turning about 30. It will start without the capacitor, which suprised me, but something's still not right. |
#5
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Need help wiring single phase motor
"Patrick C." wrote in message om... "Tim Wescott" wrote in message ... "Patrick C." wrote in message om... I picked up a single phase motor at a surplus shop and can't get it to work correctly. It's a Bodine 120v, 1/3 hp gear motor, and does not have the start or run capacitors included. The model number isn't listed on Bodine's site so I'm guessing it's an old one or a special application model. It has four leads- white, red, blue, and ground. The brief 'instructions' from the surplus shop say to wire it "White to AC, Blue to Capacitor, Red to AC and Capacitor", but when I did this it only turned about 1/6 the listed speed. Can anyone tell what I'm doing wrong? Should the AC and motor leads go to the opposite sides of the capacitor? Thanks for any help. Induction motors like to run just a bit slower than the synchronous speed. If it's starting at all and it isn't making loud buzzing noises, drawing excessive current, getting hot or letting forth smoke then the motor is hooked up correctly. Is the ID plate on the motor or the gearbox? Maybe someone replaced the original motor, and the listed speed is for another gearbox, or no gearbox? If the listed speed is 3600, 1800 or even 1200 RPM then chances are that's the motor shaft speed, not the output shaft speed. Sorry, should have included this the first time- It is getting hot and shutting off (lucky for me it has thermal protection). The nameplate speed is 180 rpm, and it's only turning about 30. It will start without the capacitor, which suprised me, but something's still not right. If Bob Englehardt's answer doesn't make you smack your forhead and scream, ask yourself if the thing may have come off of an aircraft or boat? Aircraft use 400Hz power, using 60Hz instead would make a motor turn at 33RPM instead of 180, and would make it get quite hot. I'm really reaching here, so let about 10 more unhelpful posts show up before you start taking it seriously. I don't have a good explaination for why it should run at all without the capacitor -- usually a single-phase motor like that is either running or getting _very_ hot. |
#6
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Need help wiring single phase motor
You might want to have a look at the Oriental Motor wiring diagrams if you
can't determine the wiring from the Bodine site wiring info. The OM capacitor run AC motors use a 3-wire connection. AC to Lead 1 AC to Lead 2 and one capacitor terminal Second capacitor terminal to Lead 3 While looking at various sizes of the OM motors, you'll notice that the capacitor value (uF) incerases with motor size (wattage). Their very small motors require a cap value of 1 or 2 uF, the larger ones require a 10 to 20 uF cap value (40 to 60 motor wattage). The capacitor value will affect the motor speed, and I assume the wrong value would cause excessive heat. For 120VAC motors, the caps are typically rated at 250V or 277V AC. The small value capacitors are the same type that are used in many ceiling fans, and can be found at many electrical and hardware retailers. If there is no capacitor value info on the motor plate, I wouldn't know what value to suggest if your Bodine motor is actually 1/3 HP. When encountering mystery motors that you can't find specific data on, sometimes it requires opening the motor case to see what's inside. Some dealers don't know exactly what they're selling. You might try comparing all of the specifications on the motor plate to a different Bodine motor, or another manufacturer's motor. There should be a amps or wattage value on the plate, which could be used to determine the output power. WB ............... "Patrick C." wrote in message om... I picked up a single phase motor at a surplus shop and can't get it to work correctly. It's a Bodine 120v, 1/3 hp gear motor, and does not have the start or run capacitors included. The model number isn't listed on Bodine's site so I'm guessing it's an old one or a special application model. It has four leads- white, red, blue, and ground. The brief 'instructions' from the surplus shop say to wire it "White to AC, Blue to Capacitor, Red to AC and Capacitor", but when I did this it only turned about 1/6 the listed speed. Can anyone tell what I'm doing wrong? Should the AC and motor leads go to the opposite sides of the capacitor? Thanks for any help. |
#7
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Need help wiring single phase motor
Thanks for the help everyone- I may have had it wired wrong, but I
definitely had an undersized capacitor. |
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