Electricity: motive power systems – Plural diverse motor controls – Running-speed control
Patent
1981-03-19
1983-09-13
Truhe, J. V.
Electricity: motive power systems
Plural diverse motor controls
Running-speed control
310 40R, H02K 2900
Patent
active
044045042
ABSTRACT:
An inherently low speed, high torque, high reliability electric motor features a simple design which is inherently amenable to simple electronic control and utilizes only elements of moderate precision. An electrical circuit distributes electric current successively to a multiplicity of circularly arrayed electromagnets to provide sequentially existing magnetic fields, which progresses around the circular array of electromagnets. The sequential fields attract successive circumferentially distributed portions of a rigid cylindrical shell or drum of ferromagnetic material. Successive portions around the periphery of the shell are pulled into engagement with the circular array of electromagnets. This action produces combined oscillation and rotation of the axis of rotation of the shell, which may be referred to as "nutation" thereof, and this movement is converted into the pure rotation of an output shaft by means of either (1) two pairs of concentric gears featuring mating interfaces of differing circumference, or (2) a flexible coupling which connects a shaft which is on the geometric center of the nutating magnetic drum to a shaft which rotates on fixed bearings. The circuitry includes means for full locked stopping, varying the speed and reversing the direction of rotation of the output shaft by altering the sequence of energization of the electromagnets.
REFERENCES:
patent: 3271649 (1966-09-01), Juergensen
patent: 3427898 (1969-02-01), Mayer
patent: 3593085 (1971-07-01), Decker, Jr.
patent: 3832613 (1974-08-01), Bernstein et al.
Duncanson Jr. W. E.
Leland R. Rowsell
Truhe J. V.
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