Electricity: motive power systems – Braking – Dynamic braking
Reexamination Certificate
1999-12-10
2001-09-11
Salata, Jonathan (Department: 2837)
Electricity: motive power systems
Braking
Dynamic braking
C318S139000
Reexamination Certificate
active
06288508
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to an electric motor control and more particularly to an electric motor control for an electric motor powered vehicle for providing improved braking operation therefor.
A wide variety of types of vehicles are frequently employ electric motors for their propulsion. These types of vehicles may take many forms such as golf carts and the like. In connection with these vehicles, it is common to utilize a frictional brake system for the vehicle which is of the type used with wheeled vehicles that are powered by gasoline engines or other forms of internal combustion engines. These frictional brakes may be either hydraulically or electrically actuated. This obviously adds to the cost of the total vehicle.
There have been proposed systems which regenerative braking is employed for the vehicle. With this type of arrangement, when the operator wishes to decelerate the vehicle, the motor is switched to operate as a generator and either charges the battery or discharges its generated current through a resistive load so as to provide regenerative braking. However, with these systems, conventional frictional brakes also are employed.
It is, therefore, a principle object of this invention to provide an improved braking arrangement for an electrically powered vehicle wherein the electric motor can provide substantially all of the braking force for the vehicle.
It is a further object of this invention to provide an improved braking system for an electric powered vehicle wherein the electric motor is utilized as a brake in addition to the regenerative braking normally employed in connection with such vehicles.
SUMMARY OF THE INVENTION
This invention is adapted to be embodied in a vehicle having an electric motor for propelling the vehicle. The electric motor is of the shunt type and is supplied with electric current from a battery in response to an accelerator control for controlling the speed of the vehicle. A regenerative braking arrangement is employed for generating electric power by using the shunt motor as a generator and returning the power to the power source for braking. In addition, a reverse exciting winding control circuit is provided for applying reverse excitation to the winding of the shunt motor for effecting reverse excitation braking. Means are provided for switching the braking control from the regenerative braking to the reverse exciting winding braking based upon the operator input.
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Inui Akira
Taketomi Kouichi
Beutler Ernest A.
Salata Jonathan
Yamaha Hatsudoki Kabushiki Kaisha
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