Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Reexamination Certificate
2008-04-03
2010-11-16
Leykin, Rita (Department: 2837)
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
C318S800000, C318S805000, C318S803000, C318S811000, C318S808000, C318S809000, C318S810000, C318S807000, C702S127000, C702S108000, C702S085000, C073S514260, C324S415000, C324S160000, C324S163000, C324S165000, C324S076470, C324S076550, C324S076790
Reexamination Certificate
active
07835630
ABSTRACT:
An integrated circuit for controlling a DC motor is disclosed. The integrated circuit includes at least one digital position and speed circuit (DPS) for providing measurements of speed, position, and direction of the motor, the DPS being in signal communication with the motor for receiving a pair of signals having a quadrature relationship; and at least one programmable gain amplifier (PGA) electrically coupled to the motor, the PGA being configured to receive a feedback signal indicative of current flowing through the motor and to apply a second signal to the motor for adjusting the speed of the motor; and at least two analog-to-digital converters (A/D), one A/D being used to quantize the output of the PGA for an off-chip processor; and another A/D to provide motor reference position from an analog sensor, such as a potentiometer; and at least two digital-to-analog converters (D/A), one D/A used to set the motor voltage; and another D/A used to set the motor current limit. The integrated circuit can be incorporated into a larger motor control loop which further includes a summing amplifier for providing the feedback signal to the motor that is indicative of current flowing through the motor; a buffer amplifier electrically for sensing the output current of the motor, and a processor for providing control signals to the system monolithic module and for receiving the measurements of speed, position, and direction of the motor.
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Ekekwe Ndubuisi John
Etienne-Cummings Ralph
Kazanzides Peter
Childers Jeffrey W.
Leykin Rita
The Johns Hopkins University
The Johns Hopkins University
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