초록 ▼

An electrical drive vehicle with an onboard battery and a D.C. propulsion motor having means for automatically switching the D.C. motor from a series field operation to shunt field operation upon the operator actuating the braking means to convert the kinetic braking energy to electrically energy fo

An electrical drive vehicle with an onboard battery and a D.C. propulsion motor having means for automatically switching the D.C. motor from a series field operation to shunt field operation upon the operator actuating the braking means to convert the kinetic braking energy to electrically energy for charging, via an intermediate storage means, the onboard battery. The switching means is a variable duty cycle transistor switching means controlling the excitation of the D.C. motor in the shunt field mode.

대표청구항 ▼

An electrical drive vehicle with onboard battery energized DC motor drive to at least one wheel of the vehicle wherein; said DC motor has a primary series field winding and an auxiliary shunt field winding, said shunt field winding disposed in electromagnetic coupled relation to said series field wi

An electrical drive vehicle with onboard battery energized DC motor drive to at least one wheel of the vehicle wherein; said DC motor has a primary series field winding and an auxiliary shunt field winding, said shunt field winding disposed in electromagnetic coupled relation to said series field winding; said series field winding being energized by the onboard battery when said vehicle is electrically driven; said DC motor including motor controller means with unidirectional conduction means and switching means to change said DC motor from a series field operational mode to a shunt field operational mode during braking of the vehicle such that said DC motor, operational as a shunt field machine, supplies electrical energy, derived from braking motion kinetic energy, to said onboard battery; wherein said motor controller means includes an intermediate electrical energy storage means electrically connected between said DC motor and said onboard battery such that (1) conversion of motion kinetic energy to electrical energy with storage of such electrical energy, and (2) the supply of electrical energy to the onboard battery, may occur in successive order; wherein said switching means is a transistor switching means having a variable conduction duty cycle adapted to control the magnitude of magnetic flux excitation of the DC motor when operating in the shunt field operational mode and thereby the magnitude of electrical energy converted from braking motion kinetic energy, and means for controlling the conduction duty cycle time interval such that conversation of electrical energy from braking motion kinetic energy occurs for a determined time interval; and wherein said transistor switching means is switched from series to shunt by the operator during the braking of said vehicle.