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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Direction of n AC motor
We had to take apart a motor from a Rigid thickness planer to resurface the commutator. We reassembled the motor and as crazy as this sounds we think that its now running in reverse. If we inadvertently reversed the wires to the brushes would this happen? That seems to be the only variable here. Thanks, Lenny
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#2
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Direction of n AC motor
wrote in message
... We had to take apart a motor from a Rigid thickness planer to resurface the commutator. We reassembled the motor and as crazy as this sounds we think that its now running in reverse. If we inadvertently reversed the wires to the brushes would this happen? That seems to be the only variable here. Thanks, Lenny You have hit it in one :-) |
#3
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Direction of n AC motor
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#4
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Direction of n AC motor
On Thu, 11 Jun 2015 07:22:33 +0800, "Rheilly Phoull"
wrote: wrote in message ... We had to take apart a motor from a Rigid thickness planer to resurface the commutator. We reassembled the motor and as crazy as this sounds we think that its now running in reverse. If we inadvertently reversed the wires to the brushes would this happen? That seems to be the only variable here. Thanks, Lenny You have hit it in one :-) If I recall correctly a series wound AC motor will not reverse by just changing the wires to the brushes. You would need to reverse the connections to the field winding. One end of the field winding is connected to one AC line and the other end to a brush. Then the current flows through the rotor windings and out to the other brush and from there to the other AC line. Did you maybe swap the field winding connections? Eric |
#5
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Direction of n AC motor
wrote in message ... On Thu, 11 Jun 2015 07:22:33 +0800, "Rheilly Phoull" wrote: wrote in message ... We had to take apart a motor from a Rigid thickness planer to resurface the commutator. We reassembled the motor and as crazy as this sounds we think that its now running in reverse. If we inadvertently reversed the wires to the brushes would this happen? That seems to be the only variable here. Thanks, Lenny You have hit it in one :-) If I recall correctly a series wound AC motor will not reverse by just changing the wires to the brushes. I think it will. A washing machine motor is a series connected AC type, and to reverse it, the controller just reverses the connections to the brushgear. In order for it to do this, the connections to both the field winding and the brushes are brought out to the controller. Arfa |
#6
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Direction of n AC motor
On Wednesday, June 10, 2015 at 6:54:01 PM UTC-4, wrote:
We had to take apart a motor from a Rigid thickness planer to resurface the commutator. We reassembled the motor and as crazy as this sounds we think that its now running in reverse. If we inadvertently reversed the wires to the brushes would this happen? That seems to be the only variable here. Thanks, Lenny I'm pretty sure that a typical washing machine motor for instance does not have brushes. I think that would make it an induction motor. I have some spare Maytag washing machine motors down in the basement that I liberated from machines at the town dump. They run at 1725RPM, (I think that speed is directly related to line frequency), and I don't think they have brushes either. They do however have centrifugal switches though. So I think that would that make that type of motor a compound type. My tool motor has two wires coming out of the field that go directly to the AC line. On the other side of the field there are two more wires that go to the brushes. There is no centrifugal switch. And that's it, a very simple scenario. This one I think is a series motor. The other thing is that this Rigid motor spins at 9000 RPM. We're going to try to reverse the brush wires and see what happens. Thanks everyone for the replies. I'll let you know how it turns out. Lenny |
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