Re: [CAD_CAM_EDM_DRO] Maximum stepper speed

Russell Shaw wrote:

> Hi,
>
> When driving a stepper motor with constant-current
> drive, what limits the maximum voltage that can be
> applied at higher speed? Is it just insulation
> rating?

Mostly. The di/dt (rate of current change per unit time) controls
most of the dynamic losses that heat up the motor, ie. eddy losses
in copper and iron, and hysteresis losses. There are some
capacitive effects that may cause additional losses with fast
voltage changes.

However, running at higher voltage allows more steps/second, and
so you end up spinning the motor faster. That increases the
dynamic losses.

Jon