Speed control for truck
Patent 4422022 Issued on December 20, 1983. Estimated Expiration Date: 
May 10, 2002. 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.
May 10, 2002. 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 3590350 3599064 3795850 Direct current motor speed control apparatus D. C. motor control system DC Motor control system D.C. Motor system for a gatling gun Patent #: 4386303 InventorsAssigneeApplicationNo. 06/376288 filed on 05/10/1982US Classes:318/376, Regenerative318/381With field or secondary circuit controlExaminersPrimary: Truhe, J. V.Assistant: Luen, Shik Attorney, Agent or FirmInternational ClassesH02P 7/18 (20060101)H02P 7/28 (20060101) Foreign Application Priority Data1981-05-29 CAAbstractA speed control for a DC motor drive having regenerative braking and a field reversing control, has a field current feedback circuit which includes a modifier to change the feedback signal in accordance with the saturation curve of the field to provide a feedback signal representing field strength or field flux. Because motor field strength is regulated as a function of the required field strength, the control tends to make the speed of response independent of actual field strength. Also, a feedback signal is provided which is a function of the product of actual field strength and desired armature current, i.e., related to torque, and this controls the speed signal so that the gain of the speed regulating amplifier is inversely proportional to field strength. This allows drive operation at reduced field strength while maintaining the response.Field of SearchArmature or primary currentArmature or primary circuit voltage or terminal or counter e.m.f. voltage Plural, diverse or diversely controlled braking means Including both friction braking "plugging" and/or dynamic braking Friction braking "Plugging" or application of reverse power to motor Dynamic braking Regenerative In series with armature or primary circuit With field or secondary circuit control With braking With braking BATTERY-FED MOTOR SYSTEMS Motor-reversing With running-speed control And braking And acceleration control And acceleration control Plural, diverse or diversely controlled armature windings | |
