Permanent magnet brushless torque actuator

Details Permanent magnet brushless torque actuator Permanent magnet brushless torque actuator

1992-10-08

1994-08-09

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 36, 310154, 310 68B, H02K 2112, H02K 3300

Patent

active

053370309

ABSTRACT:
A permanent magnet brushless torque actuator is comprised of an electromagnetic core capable of generating an elongated toroidally shaped magnet flux field when energized. Outside the generally cylindrical coil is an outer housing with upper and lower end plates at each end. Mounted to the end plates and extending towards each other are stator pole pieces separated from its opposing pole piece by an air gap. A permanent magnet rotor is disposed in the air gap and mounted on a shaft which in turn is rotatably mounted in each of the end plates. The permanent magnet rotor comprises at least two permanent magnets, each covering an arcuate portion of the rotor and having opposite polarities. Energization of the coil with current in one direction magnetizes the pole pieces such that each of the two pole pieces attracts one of the magnets of the rotor and repels the other magnet of the rotor resulting in a torque generated by the output shaft. Reversal of the current flow results in a reversal of the torque and rotation of the rotor in the opposite direction. Preferred embodiments are disclosed having multiple cells, i.e. a plurality of stator rotor stator combinations and/or cells in which there are a plurality of pole pieces at each stator pole plane.

REFERENCES:
patent: 3435394 (1969-03-01), Egger
patent: 4510403 (1985-04-01), Vanderlaan et al.
patent: 4600910 (1986-07-01), Vanderlaan
patent: 4612526 (1986-09-01), Vanderlaan et al.
patent: 4795929 (1989-01-01), Elgass et al.
patent: 4816707 (1989-03-01), Vanderlaan
patent: 4883981 (1989-11-01), Gerfast
patent: 5038063 (1991-08-01), Graber et al.
patent: 5038064 (1991-08-01), Fiorenza
patent: 5142181 (1992-08-01), Newell
European Search Report, 3 pages (Jan. 21, 1994).

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