Underground trolley vehicle with brushless D. C. motor
A mining vehicle is described for use on a high voltage, D.C. trolley system of the type having an overhead high voltage conductor and a pair of parallel rails at ground potential, the mining vehicle comprising: a vehicle frame; a plurality of flanged wheels, the wheels adapted to ride along the parallel rails of the trolley system, the vehicle frame carrying the following; a brushless D.C. motor having a rotor and a stator, the rotor carrying means for generating a field flux and the stator having a plurality of winding portions each portion capable of generating magnetic flux; means for mechanically coupling the rotary motion of the rotor to the plurality of wheels; a high voltage bus; connection means for contacting the high voltage conductor of the trolley system and for connecting the high voltage conductor to the high voltage bus; a switching network connected between the high voltage bus and the portions of the stator winding for delivering current to the portions of the stator winding; first transducer means for producing feedback signals representative of the position and speed of the rotor; second transducer means for producing feedback signal representative of the current delivered to the motor; means for producing an input signal representative of the speed of the vehicle; circuit means responsive to the input signal and both groups of feedback signals, for producing control signals to control the application of current to the portions of the stator winding; capacitor means connected to the high voltage bus; first resistor means connected between the capacitor means and ground potential for discharging the capacitor means when the connection means loses contact with the high voltage conductor; second resistor means; detector means for connecting the high voltage bus to the second resistor means in the event of an over-voltage condition on the bus; and brakes for acting upon the flanged wheels for bringing the vehicle to a stop when desired.
- Assignee:
- Balco, Inc., Blairsville, PA (United States)
- Patent Number(s):
- A; US 5221880
- Application Number:
- PPN: US 7-961400
- OSTI ID:
- 6360655
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
012032* -- Coal
Lignite
& Peat-- Underground Mining-- Transport & Services-- (1987-)
ANIMALS
BRAKES
CAPACITORS
DESIGN
ELECTRIC POTENTIAL
ELECTRIC-POWERED VEHICLES
ELECTRICAL EQUIPMENT
ENGINES
EQUIPMENT
HAULAGE EQUIPMENT
MACHINE PARTS
MAMMALS
MAN
MATERIALS HANDLING EQUIPMENT
MINERS
MINING
MOTORS
PERSONNEL
PRIMATES
ROTORS
TRANSPORT
UNDERGROUND MINING
VEHICLES
VERTEBRATES