Re: (ET) Lift motor control

[Bill Alexander <wca1 humboldt edu>]

I am not sure it would be happy with lights, because I believe
they depend on the inductance of the motor to operate properly.

Bill

>Ralph,
>You should have no problem with this arrangement
>if the control is a high frequency (like 20kHz)
>switching type (most of them are)
>I would add a safety circuit to insure the speed
>control didn't go above 1/2.
>Even better yet, design a speed control with
>a comparator such that it always puts out an average
>of 18V regardless of the battery voltage.
>I can show you a circuit if interested.
>Rod
>
>--- Ralph & Elaine Vogan <ralphgv centurytel net>
>wrote:
>> Hi,  I was wondering if anyone has hooked a PWM
>> controller to a lift motor.  Would it harm the motor
>> because it would still be getting 36 volt pulses?  I
>> found a place that has 20 Amp 36 volt controllers
>> for less than $45.00.  I don't know if they are PWM
>> or another type, but if set for 1/2 speed, maybe we
>> could get rid of our 18 volt tap.  These controller
>> are made for electric scooters.  Also, has anyone
>> tried them on lights?
>>
>> Ralph Vogan
>> ralphgv centurytel net
>> > _______________________________________________

Bill Alexander                         Excuse me if I ramble,
Physics Dept.                          but I drive a Nash.
Humboldt State University
Arcata,  CA  95521

phone: (707) 826-3212
e-mail: wca1 humboldt edu
http://sorrel.humboldt.edu/~phyx/faculty/alexander.html