Method and apparatus for the electronic control of electric motor driven golf car
Patent 5642023 Issued on June 24, 1997. Estimated Expiration Date: 
January 19, 2015. 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.
January 19, 2015. 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 3194715 3566227 3597669 D.C. motor control Safety features for electric vehicle control Speed control and braking circuit for a series connected DC machine Electromobile control device Shunt-wound control for on-road vehicle Field weakening system for pulse-controlled three-terminal d.c. motor Electric vehicle control device InventorAssigneeApplicationNo. 375549 filed on 01/19/1995US Classes:318/493, CONTROL OF BOTH ARMATURE (OR PRIMARY) CIRCUIT AND FIELD (OR SECONDARY) CIRCUIT318/139, BATTERY-FED MOTOR SYSTEMS318/154, Control of excitation (field) circuit of both318/373, "Plugging" or application of reverse power to motor318/376, Regenerative318/381, With field or secondary circuit control318/501, By shunting armature or primary winding318/521, FIELD OR SECONDARY CIRCUIT CONTROL388/801, Field control, or field and armature control, by digital or combined analog and digital circuitry388/803, Field control, or field and armature control, by analog (only) circuitry388/815, By voltage or current modification388/826, Field control, or field and armature control388/843Field control, or field and armature controlExaminersPrimary: Masih, KarenAttorney, Agent or FirmInternational ClassH02P 001/00AbstractA system is provided for controlling a DC motor which is constructed to propel a golf car. The motor is a shunt wound motor having independently excited armature and field windings. The basic input to the armature of the motor is supplied through a pulse modulated chopper circuit which varies the width of the pulse in response to the throttle of the golf car. Full control of the input to the field winding is gained by the supply of power to an H bridge circuit. Armature current is continuously sensed to provide an indication of the status and performance of the car during operation. At a predetermined level of armature current the field current is adjusted to provide a higher torque at a specific speed. When armature current indicates a predetermined overspeed condition, field current is adjusted to enhance regeneration and the resultant braking. In addition, the stopped condition is continuously monitored. If movement of the car begins subsequent to stopping the vehicle, the direction can be established and the a current applied to the field winding to initiate regenerative braking and restrain movement.Field of SearchRegenerativeWith field or secondary circuit control Control of excitation (field) circuit of both "Plugging" or application of reverse power to motor BATTERY-FED MOTOR SYSTEMS By shunting armature or primary winding FIELD OR SECONDARY CIRCUIT CONTROL CONTROL OF BOTH ARMATURE (OR PRIMARY) CIRCUIT AND FIELD (OR SECONDARY) CIRCUIT ARMATURE (OR PRIMARY) CIRCUIT CONTROL Plural, diverse or diversely connected or controlled field windings Selectively energized Field control, or field and armature control, by digital or combined analog and digital circuitry Field control, or field and armature control By voltage or current modification By voltage or current modification Field control, or field and armature control, by analog (only) circuitry Field control, or field and armature control | |
