Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1976-12-20
1978-07-18
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
355279, H01F 714
Patent
active
041018583
ABSTRACT:
A high torque rotary electromagnetic actuator is described which includes a U-shaped stator formed from a substantially planar sheet of magnetic iron to have two parallel leg portions joined by a transverse connecting portion. The single piece stator which is so formed is joined to an axial core which is staked or riveted to the stator connecting portion by an intimate or press-fit to minimize reluctance to the magnetic flux flowing through the stator and core. The rotor is mounted on the free end of the core and is provided with cam surfaces for providing variable gaps with relative rotation between the rotor and the stator. The rotor is provided with an enlarged axial hub portion which is configured to compensate for the reduced axial thickness thereof produced by the provision of a counterbore which receives a portion of the core therein. The construction of the actuator, as well as the materials the use of which is made possible by such construction, increases the strength of the magnetic field generated in the actuator to result in substantial increases in torque outputs available from such actuator.
REFERENCES:
patent: 3229170 (1966-01-01), Daugherty et al.
patent: 3278875 (1966-10-01), McDonough
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