Topic: Electric motor repairable?

[jonda500]

The only thing that I could see amiss under the little cover was the reverse instruction sticker had come unstuck from the underside of the cover and was resting on the contacts. A PO has obviously soldered in a replacement power cord at some stage...
I'll post anything else I can find out when I get it all apart.

[TwoTired]

Pretty much anything can be fixed, given enough time money and effort.  Have you attacked it with a multimeter yet?  Checked for continuity?

In the early sixties, I rewound my neighbors washing machine motor as a high school shop project.  The starting winding was fried since it didn't cut off when the armature attained speed.  Tedious work done in a series of classroom work periods, removing the burnt windings, and laying in new copper windings.  Neighbors were elated to have their washing machine working again.  And I got a good grade.

Btw, know that 1hp is 750 watts.  Your 888 is likely the start up consumption, not continuous duty, which is 1/2 hp.
Still, that should be plenty power for mowing, as long as you don't lug the motor so the starting winding re- engages.
I have an old black & decker electric rotary mower.  18" cut.  On top of the deck is a plastic housing 10-11 inches tall and about 8 inches in diameter. One day I hit a branch with the motor housing and it popped off, revealing a universal brushed motor the size of a small hand drill.  It still mows grass, but it looks silly.

Cheers,

[jonda500]

Pulled it apart, found no evidence of arcing anywhere? The centrifugal switch opens the contact points which disconnects the start up windings when it operates.

It is a total mystery to me how these brushless motors work, googled the crap out of it and still none the wiser - maybe I'll cut the rotor open to see what's inside!

But I found the problem - the start up windings (yellow wires) have continuity, but the main windings (pink wires) are open circuited.

I think crompton parkinson probably still produce similar spec motors in the same dimensions as this one, but I guess depending on the price, it probably wont be worth it. I'll do some research and see...

[strynboen]

i have made a lot of this engines..takes a lot of time the first 4-5..but then you got a idea if the korrekt lenghts of both,the paper isolation and kobber vindings.. it takes the half time to do a stator..but most motors in Europa is the kondensator type..vho use both coil set at running kondision..so it give a better hp/vaight/cost..so ve only see this types in bowling machines..and specily made imported stuff..you can get a elektronic controller to skip the knickser ..but there is no idea to thange if it vorks..is this still sold/used in England aussie/us?..or is it antik..like in denmark