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[DPRG] PWM Frequency/Resolution Tradeoffs

Subject: [DPRG] PWM Frequency/Resolution Tradeoffs
From: Rodent daweasel at swbell.net
Date: Fri Aug 24 10:51:24 CDT 2001

You guys need to build a test stand to measure the torque versus PWM
frequency to compare results. Unless everyone is using the exact same
wheels, motors and geartrain, as well as pushing the same amount of weight,
you are talking apples and oranges.

----- Original Message -----

> I agree with DPA about the higher frequencies giving a motor response
> equivalent to lower voltage, i.e. lower torque.
> In Otto, I discovered that 120Hz was optimum for maximum torque at all
> speeds. Also by putting a back EMF diode in the circuit, the motors
> seem to have a reduced flywheel effect.  They tend, less, to overrun
> the given speed.  Not completely, but less than without the diodes.
> This effect occures in between each pulse, and could only work if the
> pulses are far enough apart.

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