PWM out of a LPT port is about as cheap as you can get. 24 volts at 5
amps is only about 125 watts. Is that enough power?
Using a 120 volt universal motor with a PWM controller you can get
pretty high power for cheap. Universal motors (brushed wound rotor
motors) are fairly common.
Another way to go is to get a VFD drive off Ebay that will take a PWM
signal and use a cheap 3 phase motor to drive your spindle.
Dave
Ian W. Wright wrote:
> Hi, I'm wanting to change the spindle motor on my little
> mill to one which I can speed control and which has a bit
> more speed than the synchronous motor I'm using at present.
> I have a 24volt 5amp motor which I think will do the job OK
> but I'm uncertain as to how to control it from EMC2. I will
> build my own drive electronics - plenty of components,
> plenty of time, little cash !!;-{. So, what system should I
> use to control it .... 0-10v, PWM, analogue opto or what..
> Can you point me towards relevant literature / examples or
> maybe suggest a suitable circuit? Thanks
>
> Ian
> __________________
> Ian W. Wright
> Sheffield UK
>
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