Series Motor Speed Control

[AC Me]

Hi All.

I'm back again. I posted earlier requesting wiring/connection
information for a Sole Type 20584.024 motor that had been extracted
from a washing machine where the washing machine had been disposed of
and its make and model were unknown.

I have a futher request.

The above motor appears to be a Series type.
How should the speed of series motors be controlled?
Can they be controlled by the use of a light dimmer control?

Thanking you all in advance for any help you may be able to give.

Mike

[TOMA....@atcginc.net]

Mike,

The speed of a DC series motor can be changed by isolating the series
winding from the main winding, since the effects of changing the
applied voltage to the 2 windings has an opposite effect(main winding
(rotor) = increased voltage => increased speed, excitation (stator) =
increased voltage => decreased speed)).
After isolating the terminals, insert the dimmer in series with one of
the windings (since the windings are connected in series, they are
designed to support the same current).

[AC Me]

Hi TOMA.DOR

I'm no expert on motors so forgive me if I ask stupid questions.

The source to the motor is 220VAC, 50Hz.
The wiring seems, at least at first, to be a little compliacted. Here
goes...
The rotor windings are brought out to a frame mounted connector by two
wires coloured red and blue.
The stator windings are also brought out to the same connector by the
use of three wires. These are coloured brown and green with the third,
which appears to be a centre tap of the stator winding, coloured
black.
Two further wires, which are both coloured white, are taken from a
rear mounted device to the same connector. This appears to be a
mechanism to measure motor speed. I am going to ignore this - at least
for now.

The motor 'plate' indictates 300/14000 rpm.

I can get to motor to run at a very high speed (briefly, as I don't
want it to self destruct) by connecting the rotor winding in series
with the stator winding. That is Red (rortor) and Brown (stator) are
connected to 220VAC mains and Blue (rotor) and Green (stator) are
connected together.
Fine so far.

As I am not sure if a 'DC Series Wound Motor' is similar to the
above...

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[AC Me]

Sorry about this - the message somehow got posted while I was till
typing it.

Anyway, to continue...

Would (could?) a dimmer switch connected in series with the motor
below allow the speed to be controlled, do you think?
In the wiring arrangement described below the motor appears to run at
high speed. The motor 'plate' indicates that it can run at 300 rpm and
14,000 rpm. Any idea how it might be wired to run at 300 rpm?

Many thanks for your reply.

Take care.

Mike

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