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It's a 1/12 HP 120VAC motor, made by bell and gossett for a water circulation "booster pump." The motor's shaft spins freely when I spin it with my fingers. I have tried to run it with 18 volts AC from the transformer in the picture, but the motor shaft doesnt turn, and I can hear the 60HZ hum coming from the windings. Could this mean an internal short? When I apply 12 volts DC, the shaft stalls and I can't turn it anymore. There is a screw on the outer casing labelled "G" I'm guessing this is for ground, but it is necessary for a motor to be grounded for it to run? Also there is no motor capacitor, but the manual for the motor doesnt mention one. I dont know if any of this means anything to anyone, but I would really like to get this motor going. Thanks in advance.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
No the ground is not necessary for the motor to run, but you should connect it for safety if you use it on 120v. It saves you getting a jolt if it turns out that one of the windings is shorting to the frame. (this is a fairly common fault and a pretty good reason for a motor getting thrown in a dumpster, so be careful)
The fact that the shaft stalls when you apply DC, suggests that the windings are good. (if there are several windings it only proves that one of them is good)
If the motor was meant to have a capacitor and it was missing, it wouldn't start by itself. But if you spun the shaft by hand to help it, it should start. How many wires come out of it? If there are only two, there wouldn't have been a capacitor.
There is only 2 wires, so the problem is not a capcitor. I've opened the motor to check if the windings might be shorted to the casing, or possible other windings. Everything inside looks perfect, and I also checked for continuity from the motor leads to the case, and there was none. I found something interesting though, and that is that the armature has absolutly no windings on it. The armature is made out of(what appears to be)circular laminated iron. I took the armature out and hooked the motor up to 18v again and tested everyone of the internal electromagnets and they all held a screw driver in place. When I plugged the motor into 120 volts, it hummed loudly, but spun up a little. Maybe i am just dissapointed by the very low output level of this motor.
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AC motor questions.
