Re: [CAD_CAM_EDM_DRO] variable speed on single phase capacitor motors

>From the wiring diagram, it looks like this works on motors
>that I would call a Capacitor Run motor. We have capacitor
>start motors which provide for pretty good starting torque. We have
>capacitor start and capacitor run motors which provide both good
>starting torque and good torque when running. This looks like
>it would work with the capacitor start, capacitor run motors, but
>not with the capacitor start only motors. It looks like the
>circuit they are selling is effectively changing the capacitance
>run value of capacitor. So It looks like it is applicable to a load
>that would be similar to a Fan blade (maybe a blower to).
>
>I am not sure how this would apply to a specific application.
>
>When you want to reduce the current of a fan motor, you reduce
>the amount of air that it is pumping. This goes counter to many
>peoples thinking. When I take a blower out of a furnace to use
>for a shop blower, if I just set it out on the floor and turn it on,
>it usually will draw too much current. If I put a piece of plywood
>and block off the air inlet on the side opposite the motor, it usuall
>brings the current down below the rated amps.
>It is this type of system that this control i designed to work in.
>I would want to keep an ammeter in the circuit while I was
>experimenting.
>bob mcknght
>