Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Field control – or field and armature control – by digital or...
Reexamination Certificate
2007-09-18
2007-09-18
Donovan, Lincoln (Department: 2837)
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Field control, or field and armature control, by digital or...
C388S826000, C388S843000, C318S806000, C318S801000
Reexamination Certificate
active
10266793
ABSTRACT:
A field-adjustable motor control system includes a motor, an inverter coupled to provide energization to the motor, a controller coupled to the inverter, and a field adjustment circuit that provides field adjustment signals to the controller. The controller provides signals to control the output of the inverter in response to received input control signals and field adjustment signals. The input control signals define the controller's operating state that corresponds to a desired system operating state. The field adjustment signals and input control signals define a desired output parameter of the inverter for an operating state. In certain embodiments, fail-safe circuitry is also provided that includes a relay receiving controller signals. The relay's input is coupled to a line power and to the inverter output. The relay's output is coupled to the motor. If the controller fails, the relay couples the line power to the motor.
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U.S. Appl. No. 10/266,238, filed Oct. 8, 2003, Woodward et al., Pending.
U.S. Appl. No. 10/266,451, filed Oct. 8, 2003, Woodward et al., Pending.
Invitation to Pay Additional Fees for PCT/US 03/31569, dated Mar. 19, 2004, 5-pages.
Furmanek Ralph D
Shahi Prakash B
Woodward Arthur E
Emerson Electric Co.
Locke Liddell & Sapp PLLC
McCloud Renata
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