Re: [CAD_CAM_EDM_DRO] Re: dc spindle motor control.

jeff35m_73068 wrote:

>LOL thats a good one.
>But seriously I don't think this is a shunt motor. There are sparks
>from the brshes and small amounts of continueous smoke when connected
>as a shunt. The field resistance is .013 ohms.
>

There's your answer. It clearly is a series motor. You need a closed-loop
controller with a tachometer for the spindle to hold anything like a
constant
speed. Without it, it would not be unusual for the spindle to slow down 3:1
under load!

Jon