Re: Questions about changing the speed of a toy motor. - echoplex motor.jpg (0/1)

On Wed, 03 Dec 2003 04:38:42 GMT, bdm <[EMAIL PROTECTED]> wrote:

>This one should be easy for most of you. My question is, what type
>(rating, voltage, amp) of variable resistor or other component should
>I use to connect to an old toy motor (see pic) that would allow me to
>manually change it's speed? My first attempt was to connect a dimmer
>switch (from a light fixture) between one of the leeds and the power
>source (a.c. plug from outlet). Even with the dimmer rotated to it's
>max position the motor did not spin. The specs on the label of the
>motor read as follows: V.115     Hz.60     A. .25     RPM 1550
>
>Thanks in advance, Bill.
That is a shaded pole fan/blower AC motor from the looks of it.
Generally they are not suitable for speed control.  The dimmer trick
will sometimes work with very small and lightly loaded motors of that
type.    The dimmers themselves have trouble handling inductive loads,
so a better dimmer may work (under light load).

A variable frequency drive would control it over some range (if it
doesn't use a capacitor) but that isn't exactly cheap or easy.

Best advice would be to go back to your application and find a more
suitable motor or use some mechanical power transmission scheme to
change the speed.

There's lots of inexpensive DC motors around.


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