Method for checking brake torque

Details Method for checking brake torque Method for checking brake torque

1993-05-03

1994-08-30

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Braking

318362, H02P 318

Patent

active

053431340

ABSTRACT:
In an AC inverter drive connected to an AC induction motor on a material handling machine, the motor (which has a load holding brake and a pulse-emitting shaft encoder) moves a load in hoisting or lowering directions. A method for checking brake load-holding torque including the steps of decelerating the motor toward zero speed, setting the brake, applying "float" load-holding electrical power to the motor, changing the current flowing to the motor and checking for motor rotation by pulse-counting. Motor power is blocked if the number of counted pulses is less than a predetermined number or is increased if the number of counted pulses is greater than a predetermined number, the latter indicating that the brake is incapable of holding the load.

REFERENCES:
patent: 4953053 (1990-08-01), Pratt
patent: 4965847 (1990-10-01), Jurkowski et al.
patent: 4990844 (1991-02-01), Gritter et al.
patent: 4994725 (1991-02-01), Gschlossl
patent: 4996470 (1991-02-01), Rowan et al.
patent: 5027049 (1991-06-01), Pratt et al.
patent: 5061883 (1991-10-01), Asano et al.
patent: 5077508 (1991-12-01), Wycoff et al.
patent: 5115176 (1992-05-01), White et al.
Article Titled "Impulse.RTM. Drives-Designed for User Safety" from Feb., 1992 issue of Evolution Publication.

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