Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control
Patent
1976-08-23
1978-05-16
Duggan, Donovan F.
Electricity: motive power systems
Reciprocating or oscillating motor
Energizing winding circuit control
318132, 310 36, 350 65, 335229, H02K 3300
Patent
active
040901122
ABSTRACT:
An electrically damped oscillation motor having a stator component, a rotor component, a permanent magnet which provides a magnetic field across the annular gap transverse to the axis of rotation of the rotor and a drive winding for passing an electric current that interacts with the magnetic field to produce rotational deflection of the rotor. Both a tachometer winding and a compensation winding are provided in fixed relation to the drive winding, the compensation winding being located at a greater radial distance from the annular gap than the tachometer winding, and the tachometer and compensation windings being connected together in circuit so that the signal induced in the tachometer winding due to electric current flow in the drive winding is cancelled by a similar signal induced in the compensation winding, while the tachometer and compensation windings provide a net velocity signal that is used to modify the electric current flow in the drive winding to electrically damp rotational motion of the rotor.
REFERENCES:
patent: 3149274 (1964-09-01), Hetzel
patent: 3610973 (1971-10-01), Bauer et al.
patent: 3624574 (1971-11-01), Montagu
Duggan Donovan F.
General Scanning Inc.
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