Re: My stepper getting hotter

Jon,

That is not true. If it were, there would be no maximum limit on the
power supply voltage!

Step motors get hot for two reasons, copper losses and iron losses.
Copper losses are due to current passing thru a resistance, (I^2times
R) and are independent of power supply voltage in switch-mode drive.

Iron losses are primarily eddy current heating of the motor
laminations. These losses go up with the square of the power supply
voltage. Inductive reactance currents are proportional to the supply
voltage and eddy current losses are proportional to the square of
this AC current.

Iron losses range from inconsequential at low voltages to being the
majority cause of heat at high supply voltages.

Mariss

--- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote:
>
> Reducing the voltage will have minimal effect on the motor's
heating.
> <snip>
> Jon