Electricity: motive power systems – Limitation of motor load – current – torque or force
Reexamination Certificate
2006-12-05
2006-12-05
Ip, Paul (Department: 2837)
Electricity: motive power systems
Limitation of motor load, current, torque or force
C318S245000, C318S254100, C318S434000
Reexamination Certificate
active
07145302
ABSTRACT:
A method for driving a DC motor includes generating a first voltage pulse, based on a pre-determined speed input and duty cycle, and configured to generate motor current of reference current value sufficient to achieve a desired speed according to the speed input. Subsequent pulses of the voltage are generated to maintain the current substantially within a range of the reference current. Another method includes sensing and comparing motor current to reference current value and generating an error signal therebetween, which is integrated over time to generate an integrated current error, which is compared with a reference pulse. Thereafter generating applied voltage pulses configured to: switch at each instance of the integrated current error exceeding or becoming less than the reference pulse value; generate a motor current sufficient to achieve a desired speed according to a pre-determined speed input; and having substantially zero average variation from the reference current.
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Kane Ajit Wasant
Sanglikar Amit Raja
Saxena Sunit Kumar
Stephens Charles Michael
Vijayan Pradeep
Ip Paul
Klindtworth Jason K.
Testa Jean K.
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