Reverse torque preload spindle

Details Reverse torque preload spindle Reverse torque preload spindle

1990-08-14

1992-08-18

Lall, Parshotam S.

Boots, shoes, and leggings

310 51, 73660, F16F 1522, G06F 1520

Patent

active

051405296

ABSTRACT:
A vibration control apparatus includes a rotatable spindle and a generally cylindrical, stationary inductor drum. A magnetic rotor member is mounted on the rotatable spindle for rotation therewith, the rotor member being located within the stationary inductor drum and having a plurality of peripheral, accurately spaced poles separated from said stationary inductor drum by a circumferential air gap. A field coil generating an encircling magnetic flux causes torque transmission between the stationary inductor drum and rotary member. A control system is used to control the current flow to the field coil. As the coil current varies, the eddy current will be effected in direct proportion, thereby controlling the braking or reverse torque preload on the spindle to achieve vibration damping. The current allowed to flow to the coil is limited to an amount necessary to effectuate complete vibration damping or equal to a controlled percentage of the spindle drive input power wherein testing determines the maximum optimum preset value which may vary with specific applications.

REFERENCES:
patent: 4365962 (1982-12-01), Regelsberger
patent: 4456960 (1984-06-01), Wakai
patent: 4614117 (1986-09-01), Taniguti
patent: 4683392 (1987-07-01), MacDonald et al.
patent: 4729239 (1988-03-01), Gordon
patent: 4847556 (1989-07-01), Langley
patent: 4892013 (1990-01-01), Satoh
patent: 4995139 (1991-02-01), Suzuki
patent: 5012428 (1991-04-01), Veno et al.
patent: 5033305 (1991-07-01), Rozelle et al.
patent: 5049768 (1991-09-01), Andersson
Hirsch; "Variable Dynamic Energy Absorber Control System"; Navy Tech. Cat. No. 0990; Mar. 1986.

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