Re: [CAD_CAM_EDM_DRO] Treadmill motors and interference

In a message dated 08/26/2000 6:13:59 PM Hawaiian Standard Time,
timg@... writes:

<< I have tried putting a 1 uf cap in the treadmill motor power leads and it
seems to stop the problem. Looking at the design of the speed control there
is no caps downstream of the rectifier, so the motor is getting very dirty
DC from what I can figure. I am surmising that the addition of the little
cap is just enough to keep the ripple from creating enough interference to
cause ghost signals to appear on the step and direction lines.

I guess the question is, should I accept the cap as being a realistic and
reliable solution?

Tim
[Denver, CO]

>>

Tim,

I'm no electronics expert but I have used pre-made noise filters for 120 VAC
use from Digikey etc. Some are prepackaged RC networks or something. Work
real well and are very cheap. I sprinkle them all over, especially on brushed
motors. They also offer interference suppression capacitors. .1 Uf at 250
VAC. 99 cents each. DigiKey part number P4610-ND.

We may want to get Jon E. to confirm this stuff before ordering parts.

Peter
THRD, Inc.