Brakes – Operators – Electric
Reexamination Certificate
2000-07-11
2001-07-10
Graham, Matthew C. (Department: 3613)
Brakes
Operators
Electric
C310S105000
Reexamination Certificate
active
06257380
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an improved hysteresis brake and to a method of calibration thereof.
By way of background, in the past, hysteresis brakes varied in torque output at the same current inputs even though they were of the same size and construction and had their poles and casings oriented identically. This created a problem in applications where it was required that their torque outputs had to be within certain tolerances at their range of current inputs.
SUMMARY OF THE INVENTION
It is accordingly the primary object of the present invention to provide an improved hysteresis brake having structure which permits it to be calibrated to provide a torque output of a substantially predetermined value at a predetermined maximum operating current input whereby its torque output throughout its range of operation will not vary appreciably from a predetermined hysteresis curve for hysteresis brakes of the same size having the same construction.
Another object of the present invention is to provide an improved hysteresis brake having structure which permits it to be calibrated simply and efficiently to produce a torque output of a substantially predetermined value at a predetermined maximum current input.
A further object of the present invention is to provide a method of calibrating a hysteresis brake to provide a torque of a substantially predetermined value at a predetermined current input. Other objects and attendant advantages of the present invention will readily be perceived hereafter.
The present invention relates to a hysteresis brake comprising a casing, internal alternating first slots and first teeth on said casing, a pole, external alternating second slots and second teeth on said pole, said first slots and teeth being spaced radially outwardly from said second slots and teeth, a rotor including an annular portion spaced between said first and second slots and teeth, and locking means for locking said pole in a circumferentially adjusted position relative to said casing to cause said first and second poles and slots to be located relative to each other to produce a torque of a substantially predetermined value at a predetermined current.
The present invention also relates to a method of calibrating a hysteresis brake to produce a torque output of a substantially predetermined value at a predetermined current input, comprising the steps of providing a hysteresis brake having a casing and a pole, selecting a current generally below which said brake is to operate, rotating said casing and pole relative to each other to a position which will produce a torque of a substantially predetermined value at said selected current, and locking said casing and pole in said position.
REFERENCES:
patent: 3229132 (1966-01-01), Cohen et al.
patent: 3700941 (1972-10-01), Duncan
patent: 3890515 (1975-06-01), Fehr et al.
patent: 4848526 (1989-07-01), Fargier et al.
Gastel Joseph P.
Graham Matthew C.
Magtrol, Inc.
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