Hurco MD1 servo

[mardus]

When I saw a DC (?) servo motor on "Hurco MD1" mill, I was surprised!
What kind of motor is inside? It must be DC servo motor, but it has six wires!
I never saw something like that. Maybe I am wrong? Is it brushless DC motor....?

"Electro Craft Permanent magnet servo motor - teach
Model E-233
Part No. E72 21015
Ser No. 255”


Anybody knows something about that?

Thanks

[hurcojohn]

2 heavy wires (black\red) are pwm dc output from amp, 2 lighter gage wires (green\white) are tach feedback to amp, and 6-wire connector is the encoder...they are brushed motor and tach...hurcojohn

[mardus]

Tnx hurcojohn,

but something is not clear: there are only six wires and encoder is on the rear side separately coupled.
OK, 2 wires are pwm output from amp, 2 wires are tach feedback to amp, but other 2 wires?? I forgot tach encoder, yes.... but now I have 2 wires more ?
I have no idea! You are soooo close !
Thank's again

[hurcojohn]

there should be a heavy pair of wires (red and black), they are the pulse-width modulated output wires from the randtronics servo amps to the motor armature\brushes, then there is a smaller-gauge pair of wires (usually black and clear sometimes green and white), these are the tach feedback wires from the tach armature\brushes, then there is a separate 5-wire cable\connector (6-position, one wire missing) for the encoder feedback (positioning feedback), these wires are very small gauge...there will probably also be a green\yellow frame ground wire connected to the motor frame...this is from memory, and it has been awhile since i have been into an md1...i am saying total number of separate wires should be 9 or maybe 10 if there is a frame ground wire, but not all bundled in the same cable...working from memory, been awhile since i have been into an md1...regards...

[mardus]

Now I am sure that's DC brushed motor with tach. That is what I want to be sure. I am writing from memory too, because hurco is 100 km from here. I am in doubt to buy it or not because it's out of operation.
Thanks again for your help and your time

Regards