Electricity: motive power systems – Limitation of motor load – current – torque or force
Reexamination Certificate
2006-08-15
2006-08-15
Masih, Karen (Department: 2837)
Electricity: motive power systems
Limitation of motor load, current, torque or force
C318S254100, C318S271000, C318S279000, C318S376000
Reexamination Certificate
active
07091685
ABSTRACT:
A closed-loop system10is provided for controlling a DC motor. The system includes a DC motor12, a controller18associated with the motor and constructed and arranged to control operation of the motor, a voltage sensor14constructed and arranged to measure a voltage supplied to the motor, a speed sensor16associated with the motor and constructed and arranged to obtain a measured speed of the motor, and a conditioning circuit21constructed and arranged to receive a speed signal and condition the speed signal to provide to the controller, a nominal speed based on the voltage supplied to the motor, or nominal rate of acceleration or deceleration upon a change in the desired speed. The controller18is constructed and arranged to compare the measured speed with a certain speed, that is less than the nominal speed, at a voltage corresponding to a measured voltage, and if the measured speed is less than the certain speed, a fault condition is defined by the controller. The controller18is also constructed and arranged to compare the measured rate of change of speed with a desired rate of change of speed, that is more than the nominal rate of change of speed in the case of motor acceleration, or less than the nominal rate of change of speed in the case of deceleration, at a voltage corresponding to a measured voltage, and if the measured rate of change of speed differs significantly from the expected rate of change of speed, a fault condition is defined by the controller.
REFERENCES:
patent: 5917297 (1999-06-01), Gerster et al.
patent: 6696804 (2004-02-01), Sutter et al.
patent: 6745083 (2004-06-01), Eckardt et al.
Masih Karen
Siemens VDO Automotive Inc.
LandOfFree
Overload protection for DC motors does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Overload protection for DC motors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Overload protection for DC motors will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3708611