Talk:Shaded-pole motor

A recent posting on USENET asked (in effect) about the RPM - voltage characteristics of such motors, then (as so often on USENET), descended into a shouting match. Which is why I came here. I know which of the opinions I *think* is right, but I know that I don't know enough to be sure. so, is anyone monitoring this page who can cite sources and address this issue? Message-ID: <01epd3535avsf07dbq48ce9pi50dsfj4qq@4ax.com> References:   [SNIP HEADERS]

On Tue, 04 Sep 2007 00:10:34 GMT, raden  wrote:

>Total bollocks - more volts - faster rotation > >the shaded pole is the pair of thick copper wires on the laminations, >its there to determine the direction of rotation, it has no effect on >the speed

Shaded poles motors may be synchronous or non-synchronous, depending on how their rotor is constructed. For the small low-torque models used to drive timers, they're almost universally synchronous.

Evenm the non-synchronous ones are pretty insensitive to increased voltage, as they're limited by the magnetic saturation of the core. I thought that the geometry of the cage and the frequency of the AC determined the free-running speed of the motor, and the voltage (and current draw) the stalling torque. But IANA-physicist or electrical engineer. A Karley 07:40, 4 September 2007 (UTC)

C-frame motor not typical
The motor shown is a C-frame or open frame motor, which does use shaded poles, but is not what someone wants if they specify shaded pole motor. The open frame ones are very inefficient because there is so much stray field. Physicsjock (talk) 03:49, 7 October 2008 (UTC)

Needs photo
There is a good photo of the stator, but none of the rotor. The rotor construction is interesting. David Spector (talk) 19:40, 10 November 2017 (UTC)