D.C. motor control
Patent 4079301 Issued on March 14, 1978. Estimated Expiration Date: 
March 14, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 14, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3599064 DC motor regulator Patent #: 3935520 InventorAssigneeApplicationNo. 05/751497 filed on 12/17/1976US Classes:388/803, Field control, or field and armature control, by analog (only) circuitry318/432, CONSTANT MOTOR CURRENT, LOAD AND/OR TORQUE CONTROL388/805, By phase or frequency modification388/928.1Counter or back EMF (CEMF)ExaminersPrimary: Schaefer, Robert K.Assistant: Mutter, Michael K. Attorney, Agent or FirmAbstractA control circuit for a direct current motor having separately excited armature and field windings and operable in both the constant torque and constant horsepower modes includes a speed control circuit having a transfer characteristic providing an extremely high gain at lower frequencies and a low gain, for example unity, at higher frequencies and further includes means to reduce the low frequency gain when motor operation is switched from the constant torque to the constant horsepower mode. | |
