Electric motor wiring

[midsomerdave]

I have a single phase 230V motor from an old concrete mixer. There's one of each black, white, red & green wires coming from inside. How is this connected please?

 

[brianmoooore]

There's no cap. in series now, as he doesn't have the complete motor. It would have lived in the terminal box.
That's why I asked him to measure between all wires, in case there was a cap. mounted elsewhere on the motor.

 

[westward10]

I too assumed this to be split phase as the rating plate does not indicate a capacitor size although the terminal box it quite large so could house one.

 

[brianmoooore]

When the area I live in was 'electrified' only single phase was used, so most of my customers have had to manage with single phase motors. As a result I've replaced dozens of motor start and run caps. over the years, and the capacitance is rarely filled in on the rating plate. You usually have to dig out the remains of the original, and hope that the area where the rating is isn't too badly burnt to read.

 

[Lucien Nunes]

There's no cap. in series now, as he doesn't have the complete motor.

Good shout. It did seem strange to be a split-phase motor of that age and application. I had not looked properly at the pictures and misunderstood your post, which makes perfect sense.

 

[Darkwood]

I made the capacitor call on the mohassive terminal block with room for a capacitor and what seemed to be a mount for the terminal block which kept it to one side of the box.
I will put my hands up that I was just putting it out there based on that and hadn't considered a split phase as it seemed a waste of space to put a lunch box on the side of a motor for a few wires to terminate.

 

[brianmoooore]

You wouldn't use a split phase on a concrete mixer. If a mixer has been left full of concrete mix over lunch, it takes a lot of torque to start it up and get the contents moving again.

 

[brianmoooore]

Incidentally, 'split phase motor' in my part of the world (with the lack of 3 phase supplies), usually refers to a 460 volt ordinary capacitor start induction motor, referring to the supply it runs off, rather than the motor type.