Speed regulation of DC motor using current sensing means
December 17, 2013. 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 3735220 Feedback field control for an electric vehicle Control device for use in shunt motor Control circuits for electric traction motors for vehicles Control circuit for a DC electric motor particularly used in the propulsion of an electric vehicle System for driving DC motor Method and apparatus for high efficiency operation of electromechanical energy conversion devices Microprocessor-based control apparatus for a direct current machine drive system Electric wheelchair with improved control circuit Electric wheelchair with improved control circuit Patent #: 4634941 InventorApplicationNo. 815395 filed on 12/31/1991US Classes:318/493, CONTROL OF BOTH ARMATURE (OR PRIMARY) CIRCUIT AND FIELD (OR SECONDARY) CIRCUIT388/806By voltage or current modificationExaminersPrimary: Martin, DavidAttorney, Agent or FirmInternational ClassH03P 005/16AbstractA system for controlling a separately excited dc motor, where control is achieved through a microprocessor-based independent PWM control of a chopper (armature) and an H-bridge (field), and where mechanical speed sensors are not used. Connected to the armature is an armature voltage amplifier for varying the applied armature voltage. A field current amplifier is also provided for determining the direction of motor rotation and varying the voltage applied to the field winding. A decoupling controller adjusts the armature voltage and the field current.Field of SearchPrimary and secondary circuitsBoth armature and field structures rotatable or adjustable BATTERY-FED MOTOR SYSTEMS CONTROL OF BOTH ARMATURE (OR PRIMARY) CIRCUIT AND FIELD (OR SECONDARY) CIRCUIT Field control, or field and armature control, by analog (only) circuitry By pulse width or duty cycle modification By phase or frequency modification By voltage or current modification With variable impedance | |
