4 Wire motor wiring

Recently bought this miniature sensitive drill and fitted the 'Universal' sewing machine motor to power it.

Works OK apart from motor rotation. I would like to reverse the present setup. The connection is 4 pin and I (wrongly) assumed that swapping pins 2 and 3 would do the necessary

Can anyone suggest a. if it is possible to reverse the rotation and b. if it is , how to reconnect, please?

TIA

rgds

Bill

There is a very good chance that the motor isn't reversible, reverse on a sewing machine is generally done mechanically I believe. I tried to reverse one of these motors but gave up when I opened it and found that the brushes were off-set for optimum operation in the originally intended direction. I believe that you can buy these type of sewing machine motors set up for either clockwise or anti-clockwise rotation but not electrically reversible types.

Used to have one of these motors on a home built fretsaw. As far as I can remember the the 4 pins are linked to a foot pedal for speed control but no reverse. If possible you can turn the motor up the other way to achieve reverse on a permanent basis.

John

It may be possible to take the motor apart and reverse either the commutator or the field winding connections. I did this a while back with a similar motor.

More details needed.

Have you details of make and model number or a picture of red plate on the motor?

Can you confirm the green wire is the earth wire and connected to motor body?

Are you numbering the pins with number one at the top?

Do you have the other half of the plug and if so how is that wired to the mains and does it have the foot pedal?

Swapping wires around at random can be very dangerous.

To reverse this type of motor you reverse the connections to the field coils with respect to the armature connections ( the brushes).

You need to identify which wires connect to what inside the motor.

If your lucky, it may be that the red wires connect to the field coils and the black to the brushes or visa versa but that may not be the case and they are interconnected internally in the motor. Again I repeat it can be dangerous if you are not confident in what you are doing! At least check with a multimeter that it is safe.

Bruce

Ag

Keith, Journeyman, Roger, Bruce - Thank you all. The no-reverse would seem to be the most likely. My wiggly-amps skill is best restricted to rewiring plugs. so I think I'll leave well alone! Mechanical options are possible, so I'll have a ponder.

Again thanks

rgds

Bill

Motor plug 4 leads Top of Pic Earth 2 Lead Neatral 3 lead Live 4 Lead incomeing live takeing feed by the black lead to foot pedal and back to motor at No 3 single red live to .

Brian M

This *** PAGE *** from Vintage Sewing Machines might help. The fat pin is the earth.

John

Thank you - Brian and Journeyman again - that link is ideal

rgds

Bill

Could you put a twist in the belt to reverse rotation or would it foul the column ?

Looking at the details in link posted by John you would have to open up the motor to reverse the connections.

Nice to see a cluttered bench, just like mine.

Cheers

Bruce

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That’s a great link, John

If I understand correctly; the pictured plug wiring [and the related comment] suggests that Bill’s motor has already been reversed

... correct me if I am wrong, Please

MichaelG.

No the motor has not been reversed, its just the wires to the speed control pedal are swapped over which makes no difference to the direction of motor.

Bruce

Thanks all -

SB5 - unfortunately too close centre-to-centre to twist.

Bruce - fiddling with wiggly-amps is a 'no-no'! ... I feel that I should point out that the pic shows my TIDY work area!!!

MG - Pic wiring is original - I did try the 2 and 3 reversed but no difference, as Bruce pointed out, so reinstated.

Have dug out another, similar sized motor, completely without ident info but double ended drive. Is it possible to SAFELY identify/connect it to use? ... Answers in the "John and Jane look at electric motors" category, please!

rgds

Bill

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Noted ... Thanks

MichaelG.