This is from an old Westinghouse fan and I am not clear on this motor type and how to best control its speed.
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This is a Shaded Pole Induction motor. Simple, Robust, Ineffecient. Voltage control will work on a fan type of load. This is not ideal but it is simple and robust.
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\$\begingroup\$ So I can apply simple rheostat (resistance) to the line voltage then? \$\endgroup\$ Nov 25, 2018 at 1:44
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\$\begingroup\$ @Chris1964 No, rheostat control (though it would actually work) is not what you would use. You could use a standard fan Triac control ( an example here: amazon.com/dp/B004Q01PQI/ref=psdc_13397451_t2_B000X4PMRY) or an autotransformer (fixed switch positions) unit such as these: fansandspares.co.uk/assets/shop/datasheets/… \$\endgroup\$ Nov 25, 2018 at 1:49
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\$\begingroup\$ Thanks! I found a KB Electronics Solid State Motor Speed Control Part# KBWC-15K which supposedly supports a shaded pole motor and has a triac design. I looked up triac speed control apparently a triac turns on and off really fast (variable to some secondary voltage that is controlled by a rheostat) and turns the load on and off at an adjustable rate. So essentially the fan gets full power but in time slices. Do I have this right? \$\endgroup\$ Nov 26, 2018 at 5:07