Electricity: motive power systems – Induction motor systems – Braking
Reexamination Certificate
2007-09-11
2007-09-11
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Induction motor systems
Braking
C318S760000, C318S758000, C318S369000, C318S461000, C318S468000, C187S291000, C187S293000
Reexamination Certificate
active
11002011
ABSTRACT:
A method and apparatus for stopping an AC motor that is controlling a load while detecting mechanical brake slippage of a mechanical brake for holding the load against movement includes a controller for decreasing torque-producing current commands from the drive while a speed regulator is commanding zero speed, sensing movement of the load while the speed regulator is commanding zero speed, detecting movement of the load past a pre-determined distance limit, and increasing torque to support the load and prevent further movement of the load. The controller will again decrease torque-producing current commands from the drive, and again checking for movement of the load, and upon sensing no load movement upon reaching zero torque, then shutting off the motor.
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Cooksey Lynn J.
DeLange Robert J.
Frazier Glenn E.
Lichon Roman W.
Rowan Timothy M.
Colon Santana Eduardo
Donovan Lincoln
Gerasimow Alexander M.
Quarles & Brady LLP
Rockwell Automation Technologies Inc.
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