Re: Power Supply for 4-axis CNC stepper driver

<snip>

> If you stop stepping and just hold at full torque the chopper

circuit will

> hold the current at 5.5A or the LR circuit will drop 57.7V across the
> resistor and 2.3V across the winding. Let's see.... 57.7V + 2.3V

== 60V *

> 5.5A is 330VA. The chopper circuit needs to supply 5.5A too but

from a 60V

> supply.

I think since we are talking chopper, we can break this into two
parts. The first is resistors, does not apply here. The second,
choppers....

" The chopper circuit needs to supply 5.5A too but from a 60V supply."

This would mean that 5.5A in the time slices as directed from the
comparitor. it would still be PWM, maybe based on 20kHz or some such,
but it would be at a 9% duty cycle, no ?

So, it would be 5.5volts and 6 amps (33 watts) or 60volts and 0.55
amps (33 watts)

Dave