Re: [CAD_CAM_EDM_DRO] Re: more horsepower (defs)

----- Original Message -----
From: <ballendo@...>
>
> How do those of you in the "Watts in = HP out" 'camp' account for the
> increased torque ratings of stepper motors through the use of better
> magnets?
> Give me an old superior 23 single stack motor, and a new pacific-
> scientific 23 single stack motor , each with the same Volt/amp ratings
> (and therefore the same wattage)and I am confident the newer motor
> will have "more horsepower". Meaning that for a GIVEN INPUT IN WATTS,
> IT WILL PRODUCE MORE OUTPUT IN TORQUE AT SPEED than the older motor!
> Has to be. The magnets ARE better! Watts are the same.
>
> What say ye all?

Ballendo;

Watts in times efficiency is proportional to HP out. The new motor with
better magnets is more efficient at converting electrical energy to
mechanical energy. Some is still wasted, but not as much as with the older
motor. That is why the older motor runs hotter. Remember cooling fins?

When I said it takes about 1KW of electrical energy to get one HP of
mechanical energy, the 1000-746=254 watts that are missing went into heat.
No doubt you will agree that more efficient motors generate less heat.

Regardless of the efficiency, 746W will be converted into mechanical energy
for each HP delivered at the shaft. The efficiency determines how much
extra wattage must be supplied to the motor as wasted heat.

Doug