摘要:
This invention concerns an electric drive system (200) for driving an output. The electric drive system comprises: a first electric motor (250) arranged to drive a first input shaft (230) at a first angular velocity, ω1, and a second electric motor (260) arranged to drive a second input shaft (240) at a second angular velocity, ω2. A gear mechanism (210) is provided and is arranged to transmit angular rotation of the first (230) and second (240) input shafts to drive the output (220) at an output angular velocity, ωout, such that ωout is proportional to aω1-bω2, where a and b are constants. The electric drive system (200) further comprises a controller (270) arranged to control operation of the first (250) and second (260) electric motors. When the output (220) is to be driven from ωout=0, the controller (270) is arranged to control the first (250) and second (260) electric motors to drive the first (230) and second (240) input shafts. The input shafts are driven in a first phase to primary first and second angular velocities, ω1,p and ω2,p, such that aω1,p≈bω2,p. The input shafts are also subsequently driven in a second phase in which the first angular velocity, ω1, or the second angular velocity, ω2, or both are varied such that aω 1≠bω2 and the output is driven from ωout=0. The result of this is that the motors run in a more efficient part of their output profile, even whilst the vehicle is at rest, pulling off (especially in situations of high output load such as on off-road or otherwise difficult terrain), or moving at low velocity.
摘要:
A throttle valve has a control member which is angularly positioned by two stepper motors which drive the control member through differential gearing. The drives to the control member are arranged so that a single step displacement of the respective motors in the same direction drives the control member by different amounts in opposite directions, providing a high resolution drive. The control member may be driven at a high speed by reversing one of the motors.
摘要:
A PAIR OF DC MOTORS ARE COUPLED TO A SHAFT VIA A DIFFERENTIAL DRIVE. ONE OF THE MOTORS IS ENERGIZED VIA A FIRST MOTOR ENERGIZING CIRCUIT WHICH INCLUDES A FIRST SWITCH. THE OTHER OF THE MOTORS IS ENERGIZED VIA A SECOND MOTOR ENERGIZING CIRCUIT WHICH INCLUDES A SECOND SWITCH. CONTROL CIRCUITRY CONNECTED TO THE FIRST AND SECOND SWITCHES CONTROLS THEIR CONDITION IN ACCORDANCE WITH A CONTROL VOLTAGE PROVIDED BY THE CONTROL CIRCUITRY.
摘要:
A system is provided for controlling a work machine, including an electric continuously variable transmission. The system includes a microprocessor, wherein the microprocessor is configured to include a state machine for controlling the behavior of a work machine. The state machine includes a set of states representing possible conditions the work machine may encounter between starting at a zero energy input and being ready to work.
摘要:
An apparatus for changing the frequency of motion of a core-pusher device for a rewinder in relation to the feeding speed of the web material to be wound, includes a mechanism for the actuation of the pusher which is kinematically connected to the driven shaft of an epicyclic gear train which includes two driving shafts and a driven shaft. A first driving shaft of the gear train in kinematically connected to a member rotating at a speed proportional to the feeding speed of the web material, and the second driving shaft of the gear train is kinematically connected to a correction motor.
摘要:
A powered linear actuator is provided primarily for releasing stores from aircraft, having dual closed loop servo motor systems driving a screw jack. The dual motors, which have samarium cobalt permanent magnets, drive the screw jack through differential gearing and each has an armature lock which functions automatically if a motor circuit fails thereby enabling the other motor to continue driving the actuator alone. Potentiometer feedback is applied to dual error amplifiers or polarized relays that compare the feedback position signal with the input command signal and drive separate motor energization channels. A replaceable plug-in resistor is provided in series with the potentiometer track so that the actuator stroke can readily be changed by changing one value plug-in resistor for another.