Direction of an AC motor revisited

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whit3rd 11 years ago

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ng in reverse after being disassembled and then put back together. It turns out that reversing the brushes did indeed reverse the direction of the mot or. We can't argue with success, but I still don't fully understand why thi s is so. Can anyone please explain this to me? Thanks, Lenny

e same amount, or perhaps just two? Because if you think about that if they all moved the same as a group it doesn't make any sense. Lenny

I think it makes sense. The commutator selects a winding. The rotation of brushes determines whether winding #1 puts a new rotor N pole CW of the stator's S pole, or wi nding #2 puts a new rotor N pole CCW of the stator's S pole

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Wolfgang Allinger 11 years ago

on an AC Motor are no permanent S and N poles ;( Its because Alternating Current = AC!

Wolfgang

Wolfgang Allinger, anerkannter Trollallergiker :) reply Adresse gesetzt! ihr Niveau herunter und schlagen mich dort mit ihrer Erfahrung! :p (lt. alter usenet Weisheit) iPod, iPhone, iPad, iTunes, iRak, iDiot

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M Philbrook 11 years ago

Yeah but, it's a series motor so that means it can operate on AC or DC..

As for the communtator being out by 1.5" or so, that isn't anything to worry about because in the first short running time that should smooth out, unless there is some bearing play? You really don't want that.

Jamie

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hrhofmann 11 years ago

It's good to know Sam Goldwasser is still around, his posts are almost always 100 correct!!!

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Wolfgang Allinger 11 years ago

The OP didn`t say anything about how the field is connected. It`s likely, but not necessarily a series motor.! So how do you know?

There are 3 types of brushed Motors with non permanent fields:

Nebenschluss Motor - shunt wound motor Reihenschluss Motor - series wound motor and combinations of them.

Mostly but not all are running with DC and low freq. AC (50/60Hz) Some need a special wound for running properly with AC.

Wolfgang

Wolfgang Allinger, anerkannter Trollallergiker :) reply Adresse gesetzt! ihr Niveau herunter und schlagen mich dort mit ihrer Erfahrung! :p (lt. alter usenet Weisheit) iPod, iPhone, iPad, iTunes, iRak, iDiot

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Direction of an AC motor revisited

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