Brakes – Internal-resistance motion retarder – Magnetic fluid or material
Patent
1992-01-13
1993-08-10
Halvosa, George E. A.
Brakes
Internal-resistance motion retarder
Magnetic fluid or material
188159, 318376, B60L 728
Patent
active
052340830
ABSTRACT:
A magnetic brake is provided having a combined collar and flywheel with a braking disc and a fan which are all rotatably mounted on a shaft fixed between a pair of frames. The magnetic brake further includes an electromagnetic coil wound on an electromagnetic ferrite core, a plurality of permanent magnets mounted on an inner surface of the collar, and a stator coil wound on a stator ferrite core disposed in a stator ferrite core seat. An electrical circuit is provided having a rectifying circuit coupled to a first voltage regulating circuit for powering the stator winding and the other circuitry. A digital-to-analog converter is included for converting an input digital control signal to an analog control signal. The output of the converter is coupled to a second voltage regulator, the output of which is coupled to a current regulating circuit for driving the stator winding. Thus, the magnetic brake does not require an external power source and utilizes digital signals to control the magnitude of the magnetic braking force.
REFERENCES:
patent: 2066131 (1936-12-01), White
patent: 2412228 (1946-12-01), Oetzel
patent: 4084810 (1978-04-01), Forsman
patent: 4475075 (1984-10-01), Munn
Halvosa George E. A.
Klein David I.
Rosenberg Morton J.
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