Electricity: motive power systems – Constant motor current – load and/or torque control
Reexamination Certificate
2008-06-17
2008-06-17
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Constant motor current, load and/or torque control
C318S433000, C318S434000, C323S274000, C323S284000
Reexamination Certificate
active
07388342
ABSTRACT:
A system and method for operating a motor drive unit. The motor drive unit is coupled to a motor driving a load and is configured to selectively control the motor according to a torque control mode and a speed control mode. The motor drive unit includes a circuit configured to generate an operational condition signal indicating an operational condition of the motor and a regulator configured to receive the operational condition signal and generate a motor control signal. The motor drive unit also includes a first controller configured to receive the motor control signal and a reference control signal and select either the motor control signal or the reference control signal to use as a control signal to drive the motor according to either torque control or speed control. The motor drive unit also includes a second controller configured to monitor the operational condition signal and, upon detecting a preliminary indication of a change in the load, bypass the first controller to drive the motor according to the other of torque control or speed control.
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Golownia John J.
Simon Thomas E.
Werner Peter H.
Kuszewski Alexander R.
Leykin Rita
Quarles & Brady LLP
Rockwell Automation Technologies Inc.
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