Traction motor controller for forklift vehicles
May 7, 2010. 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 ReferencesD.C. motor control Control circuits for electric traction motors for vehicles Battery-powered electric vehicle d.c. motor control Speed control for truck Motor torque control with improved linearity Microprocessor-based control apparatus for a direct current machine drive system Method and circuit for DC motor field regulation with speed feedback Method and system for controlling chopper Device for controlling the field current of DC motors Patent #: 4845413 InventorAssigneeApplicationNo. 519987 filed on 05/07/1990US Classes:318/139, BATTERY-FED MOTOR SYSTEMS318/493, CONTROL OF BOTH ARMATURE (OR PRIMARY) CIRCUIT AND FIELD (OR SECONDARY) CIRCUIT388/803Field control, or field and armature control, by analog (only) circuitryExaminersPrimary: Ro, BentsuAttorney, Agent or FirmInternational ClassH02P 007/06AbstractA system for controlling separately excited shunt-wound dc motors, where control is achieved through microprocessor-based independent PWM control of a chopper (armature) and an H-bridge (field). Connected to the armature is an armature voltage amplifier for varying the applied armature voltage. A field voltage amplifier is also provided for determining the direction of motor rotation and varying the voltage applied to the field winding. A first sensor is connected to the motor armature in order to determine the motor rotational speed. A second sensor is connected to the armature circuit in order to determine the armature current. A third sensor is connected to the field circuit in order to determine the field current. A decoupling controller uses the motor speed and armature current information, and adjusts the armature voltage and the field voltage. An optimal controller uses the motor speed, field current and armature current information, and adjusts the armature voltage and the field voltage.Field of SearchBATTERY-FED MOTOR SYSTEMSPLURAL DIVERSE MOTOR CONTROLS Motor-reversing With running-speed control Running-speed control CONTROL OF BOTH ARMATURE (OR PRIMARY) CIRCUIT AND FIELD (OR SECONDARY) CIRCUIT ARMATURE (OR PRIMARY) CIRCUIT CONTROL CLOSED LOOP SPEED CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR Field control, or field and armature control, by digital or combined analog and digital circuitry Field control, or field and armature control, by analog (only) circuitry Armature control by digital or combined analog and digital circuitry | |
