Oscillating reed electric motors
AssigneeHorstmann Clifford Magnetics Ltd.
InventorsCecil Frank Clifford, Laurence Harry Finlayson
Life of this patent
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Abstract
An electric motor of the kind in which an oscillating element carries a magnet which is coupled magnetically to a rotor to transmit drive thereto. The electrical driving signals for the oscillating element, derived for example from a divided-down quartz crystal oscillator, have a frequency f which is f/2Q less than the natural resonant frequency of the oscillating element, where Q is the Q factor of the element, to maintain drive of the latter for all variations in natural frequency due to ambient changes.
Claims13
An electric motor comprising a mechanically oscillatory element, a magnetic coupling cooperating with the oscillatory element, a rotor cooperating with the magnetic coupling, a permanent magnet carried by the oscillatory element, a driving coil interacting with said permanent magnet, and means for supplying to the driving coil signals to effect oscillation of the oscillatory element and thereby impart continuous rotation to the rotor through said magnetic coupling, said permanent magnet having a cross sectional area exceeding the square of its length.
Dependencies are inferred from the claim text.