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US 5,210,452 AGranted
Symmetric armature for high current, air-core pulsed alternators
AssigneeBoard of Regents, The University of Texas System
InventorsSiddharth B. Pratap, Mike L. Spann, W. Alan Walls
Life of this patent
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Abstract
A high-energy output, air-core pulsed alternator utilizes stacked armature coils mounted on the outer periphery of an armature rotor. The stacked coils are symmetrically arranged with respect to one another so as to balance axial or longitudinal forces exerted upon the rotor for high energy pulsed output. The alternator may also include any load device which requires high energy output such as, but not limited to, an electromagnetic railgun.
Claims25
A pulsed alternator, comprising:
- a rotor having a longitudinal axis of rotation;
- a first coil mounted on an outer periphery of said rotor and centered abut a radius of said rotor, said radius being substantially perpendicular to said longitudinal axis;
- and
- a second coil mounted on said outer periphery of said rotor and centered about said radius, said second coil being radially displaced from said first coil;
- said first and second coils being connected whereby Lorentz forces generated by said coils along said longitudinal axis are substantially balanced when a high energy current is discharged through said coils.
2 more elements
A pulsed alternator, comprising:
- a rotor having a longitudinal axis of rotation;
- an excitation winding mounted within said rotor;
- a first coil mounted on an outer periphery of said rotor and centered about a radius of said rotor, said radius being substantially perpendicular to said longitudinal axis;
- and
- a second coil mounted on said outer periphery of said rotor and centered about said radius, said second coil being radially displaced from said first coil;
- said first and second coils being connected whereby Lorentz forces generated by said coils along said longitudinal axis are substantially balanced when a high energy current is discharged through said coils and excitation current is discharged through said excitation winding.
3 more elements
A pulsed alternator, comprising:
- a rotor;
- a plurality of paris of stacked inner and outer armature coils mounted circumferentially about an outer periphery of said rotor;
- each pair of stacked armature coils including:
- a first coil mounted on an outer periphery of said rotor and centered about a radius of said rotor, said radius being substantially perpendicular to said longitudinal axis;
- and
- a second coil mounted on said outer periphery of said rotor and centered about said radius, said second coil being radially displaced from said first coil;
- said first and second coils being connected whereby Lorentz forces generated by said coils along said longitudinal axis are substantially balanced when a high energy pulsed current is discharged through said coils.
4 more elements
A pulsed alternator, comprising:
- a stator encasement;
- at least two energizeable field coils mounted on an inner surface of said stator encasement and adapted to form a magnetic field therebetween;
- a substantially cylindrical rotor rotatable about a longitudinal axis and within said magnetic field, said rotor having a substantially arcuate outer surface;
- a first main armature coil having a first conductive path mounted on said outer surface of said rotor and centered about a radius of said rotor, said radius being substantially perpendicular to said longitudinal axis;
- and
- a second main armature coil having a second conductive path mounted on said outer surface of said rotor and centered about said radius, said second conductive path being substantially identical to said first conductive path and being transposed relative to and radially displaced from said first conductive path;
- whereby Lorentz forces generated by said conductive paths along said longitudinal axis are substantially balanced when a high energy current is discharged through said conductive paths.
4 more elements
A pulsed alternator, comprising:
- a substantially cylindrical rotor having a longitudinal axis surrounded by an arcuate surface;
- a rotatable shaft connected to said rotor and extending along the longitudinal axis of said rotor;
- at least one pair of inner main armature coils mounted circumferentially about said arcuate surface and substantially equidistant from each other, each pair being centered about a diameter of said rotor;
- at least one pair of outer main armature coils, each outer coil being mounted to said rotor and spaced radially from each inner main armature coil and being centered about said diameter;
- each said inner and outer coil including a plurality of inner and outer wires, respectively, said inner and outer wires configured to discharge high energy pulsed current through said wires in response to rotational movement of said shaft;
- said inner and outer wires being wound in a substantially planar configuration with a horizontal centerline extending within said plane and extending substantially perpendicular to said longitudinal axis, said inner and outer wires having upper and lower pole start conductor ends which extend within said plane and outside said inner and outer coils;
- said outer wires being symmetrically arranged with respect to said inner wires, whereby said outer wires are rotated about said horizontal centerline to maintain substantial balance of Lorentz forces along said longitudinal axis when said high energy current is discharged;
- main brush slip rings mounted on an end of said shaft and electrically coupled to said upper and lower pole start ends;
- and
- a low impedance device electrically coupled to said brush mechanism.
7 more elements
Dependencies are inferred from the claim text.