Re: [CAD_CAM_EDM_DRO] Re: LARGE DC MOTOR speed control question

wanliker@... wrote:

>
> In a message dated 7/15/00 12:30:48 PM Mountain Daylight Time,
> hightechsystems@... writes:
>
> << Your voltage on 120 will be closer to 110 maybe. The
> meter does not usually read the peak of the sine wave. >>

That is what I was trying to say RMS is .707 X peak value that gives
your effective value. Average value = .637 X peak value this is where
the power really is in a sinusoidal wave.

> The standard meter reads RMS, this is the equivalent heating power as an
> equal DC voltage, however the capacitors of a rectified power supply will see
> the peak voltage, and will read 1.4 times the RMS input voltage, under no
> load conditions. As soon as you load the power supply the voltage will droop
> badly, how much will depend on half, or full wave rectifiers, size of
> capacitor, and load applied, really more important to a technician or an
> engineer than us. Use 120 volt AC input for 90 volt motors, and 220 volt AC
> input for 180 volt motors, close enough for the girls we dance with.
> You can also get into controllers, and there are adjustments that will help
> smooth things out, also better and two types of speed regulation, armature
> and field control.
> You could write a book on DC motor control.
> bill
>
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