1. #1
    i2i's Avatar
    Lives in Cardiff, United Kingdom. Last Activity: 23-12-2016 Has been a member for 7-8 years. Has a total post count of 693. Received thanks 30 times, giving thanks to others 0 times.
    Hi guys, has anyone rewired a stepper.
    I have a triple stack nema 34 stepper manufactured in the 80's, which seems to be breaking down and loses direction and stalls regularly.
    I've swapped drivers and tried the same type of motor on the existing driver, so it's definitely the motor.
    I've also replaced the original wiring which looked a bit rough.
    i've stripped it and tried to make sure there's no crap inside it, and it looks as though the existing insulation on the coils is failing in places. I've also noticed faint traces of rust forming between the core laminations in one or two places.
    Any ideas, it would be a shame to just replace this stepper motor.

  2. it possible to rewind motors, tho I've never tried it. In concept its simple, in practice I guess getting it right isnt so easy. I also read somewhere that dismantling a stepper can have an adverse effect on the magnetisation of the rotor so you lose a shed load of torque. Here's a thread on rewinding hi-performance motors for RC cars... I guess the techniques are much the same... http://www.xmodsforum.co.uk/showthread.php?t=761

  3. #3
    i2i's Avatar
    Lives in Cardiff, United Kingdom. Last Activity: 23-12-2016 Has been a member for 7-8 years. Has a total post count of 693. Received thanks 30 times, giving thanks to others 0 times.
    thanks for the help, after my intrusion into the motor it seems to be as good (when working) as before. It feels as though a coil is partially shorted as there is a bit of physical resistance on part of one revolution. Each of the two coils (windings) has the same resistance of 1.25 ohms, and there are no shorts to the case.

  4. #4
    Are the bearings falling apart?

  5. #5
    i2i's Avatar
    Lives in Cardiff, United Kingdom. Last Activity: 23-12-2016 Has been a member for 7-8 years. Has a total post count of 693. Received thanks 30 times, giving thanks to others 0 times.
    no, they're in great condition

  6. #6
    carwood.co.uk will take on just about any motor but the cost adds up, paying for UK engineer time verses buying new will be a close call. DIY will certainly be the cheapest way forward but have no advice to give on doing it, like so many things it seems like a reasonably simple process ;-)

  7. #7
    i2i's Avatar
    Lives in Cardiff, United Kingdom. Last Activity: 23-12-2016 Has been a member for 7-8 years. Has a total post count of 693. Received thanks 30 times, giving thanks to others 0 times.
    sounds expensive, i'll double check the performance against a good motor and work out the windings.

  8. #8
    Quote Originally Posted by i2i View Post
    sounds expensive, i'll double check the performance against a good motor and work out the windings.
    Any progress?

  9. #9
    Quote Originally Posted by i2i View Post
    I have a triple stack nema 34 stepper manufactured in the 80's, which seems to be breaking down and loses direction and stalls regularly.
    Which makes it as powerful as a double stack modern Type 23
    John S -

  10. #10
    i2i's Avatar
    Lives in Cardiff, United Kingdom. Last Activity: 23-12-2016 Has been a member for 7-8 years. Has a total post count of 693. Received thanks 30 times, giving thanks to others 0 times.
    Quote Originally Posted by boldford View Post
    Any progress?
    i've not had a chance to do anything with it.

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