Smiths synchronous clock motor

Discussion in 'Electric Horology' started by Phil G4SPZ, Mar 18, 2019.

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  1. Phil G4SPZ

    Phil G4SPZ Registered User
    NAWCC Member

    Oct 18, 2018
    Retired Chartered Electrical Engineer
    Bewdley, Worcestershire, UK
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    A friend of mine owns an old Works Clock which, at some time in its past, has been converted from clockwork to mains electric. I am trying to advise him how best to proceed, as the motor itself works but is now very noisy in operation.

    On the translucent plastic cover it carries the wording “Smiths Clocks & Watches” (so after 1955) and the voltage, frequency and power ratings (200-250V 50~, 2 Watts). It appears to have a smaller diameter rotor compared with normal Smiths ‘Bijou’ clock motors. It also incorporates a heavy-duty gearbox with an output spindle carrying a pinion, which I’m guessing rotates at 1 RPM.

    I’ve been unable to identify the type of this motor. It doesn’t appear in Barrie Smith’s book nor can I find anything on the internet. I think it must be an industrial type of motor. Can anyone help with more information, please?

    Many thanks,


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