Electricity: motive power systems – With flywheel or massive rotary member
Reexamination Certificate
1999-08-30
2001-09-25
Nappi, Robert E. (Department: 2837)
Electricity: motive power systems
With flywheel or massive rotary member
C318S139000, C318S150000, C180S065310
Reexamination Certificate
active
06294886
ABSTRACT:
The present invention relates to the supplying of electrical energy to electric traction public transport vehicles and concerns more particularly the supplying of electrical energy to trams.
Given the increase in urban traffic, it is becoming necessary to be able to run public transport vehicles such as high-capacity trams of up to 30 to 40 m in length and to do so without employing a catenary-based supply, in particular in town centres crammed with amenities of all sorts, whilst guaranteeing them commercial speeds and performance levels which are compatible with the requirements of transport systems.
To date, no solution is known to the problem of the autonomy of large-gauge trams with respect to the catenary.
Solutions which favour the autonomous running, with no catenary, of electric vehicles relate only to small vehicles of low capacity and mass, of the order of 30 tonnes.
There are systems for the continuous pick-up of electrical energy via the ground but these systems pose difficult and expensive civil engineering and safety problems.
The invention aims to remedy the drawbacks of the prior art devices by creating a system for supplying electrical energy to an autonomous tram of high capacity which allies simplicity of design with reasonable cost price and relative ease of installation.
Its subject is a supply system for an electric traction vehicle equipped with electric traction motors supplied by a traction system and pantograph means for connecting the traction system to a catenary, characterized in that it furthermore comprises in combination, an autonomous supply device carried on board a vehicle and including a kinetic accumulation of energy system having a rotating machine with rotor forming a flywheel and operating either as a motor, or as a generator, means for connecting the kinetic accumulation of energy system in the charging regime to the mains supply during stoppages of the vehicle in stations, and in the discharging regime, to the traction system, the said kinetic accumulation of energy system being a system for recovering the braking energy of the vehicle.
According to other characteristics of the invention:
the autonomous supply device furthermore comprises a backup reserve system which can be linked to the mains with a view to its recharging or to the traction system with a view to the supplying of the latter in degraded mode, and including a traction battery and a charger of the said battery from the mains, and means for switching the backup reserve system, either over to the traction system or over to the mains;
the supply system furthermore comprises, in each station, a contact wire for supplying the kinetic accumulation of energy system from the mains by way of the said means for connecting the traction system to the catenary;
the supply system furthermore comprises means for controlling the pantograph connection means with a view to placing them in contact with the contact wire as soon as the vehicle arrives in a station and means for controlling withdrawal of the pantograph connection means with respect to the contact wire when the vehicle leaves the station;
the supply system comprises means for managing the energy of the kinetic accumulation of energy system with a view to enabling the vehicle to make best use of the energy of the said system so as to enable it to make its journey between rechargings from the high voltage mains in two successive stations, a sensor of the current drawn by the kinetic accumulation of energy system and fed to the traction system, tachometer means for determining the speed of rotation of at least two electric traction motors of the vehicle and the distance travelled by the vehicle and a sensor of the speed of the flywheel of the rotating machine of the kinetic accumulation of energy system being associated with the said management means;
the said management means comprise an on-board central computer linked by an on-board computerized network to an electronic control circuit of the traction system and an electronic control circuit of the kinetic accumulation of energy system;
the on-board central computer of the vehicle contains speed values corresponding to energies remaining to be provided until the next stoppage of the vehicle in a station, the said energy values being intended to be compared with the energy still available in the kinetic accumulation of energy system so as to deliver, to the traction system, speed limitation preset instructions when the vehicle is in the traction state;
the electronic control circuit of the kinetic accumulation of energy means comprises means for actuating the means for switching the backup reserve system over to the traction system when the energy available in the kinetic accumulation of energy system reaches a predetermined minimum value below which the kinetic accumulation of energy system is no longer rechargeable in-station in the course of a normal duration of stoppage.
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by Schaible et al., “A Torque Controlled High Speed Fly-wheel Energy Storage System for Peak Power Transfer in Electric Vehicles”, Conference Record of the Industry Applicatons Conference, vol. 1, No. Conf. 29, Oct. 1994.
Alstom France SA
Leykin Rita
Nappi Robert E.
Young & Thompson
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