Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-11-03
2001-09-11
Enad, Elvin (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S054000, C310S058000, C310S059000, C310S179000
Reexamination Certificate
active
06288460
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to electric motors, and more particularly to a fluid-cooled, high power switched reluctance motor for use in an electric powered vehicle.
BACKGROUND OF THE INVENTION
In recent years, there have been ongoing efforts to develop electric powered vehicles. A problem with most electric-powered vehicles is that the motors are unable to develop sufficient power, under design restraints such as size, weight and electrical consumption, typically required by such vehicles.
The present invention provides a heavy-duty, high power switched reluctance motor for direct drive of an electric powered vehicle.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided a fluid-cooled, switched reluctance (“SR”) motor comprised of a stator having a plurality of evenly spaced, radially oriented like stator poles that define a gap between adjacent stator poles. The stator poles are dimensioned wherein adjacent stator poles have side walls that are parallel to each other. Windings are wound about the stator poles, adjacent windings forming a slot of uniform cross-section between adjacent stator poles. A rotor element is mounted for rotation relative to the stator. The rotor has a plurality of equally spaced, radially oriented like stator poles. An elongated cooling tube is disposed between each of the slots between the windings. The cooling tube has a first end and a second end and is essentially dimensioned to fit within the slot between the adjacent windings. A first manifold is disposed at a first end of the stator and a second manifold is disposed at a second end of the stator. The first manifold is connected to the first end of each of the cooling tubes, and the second manifold is connected to the second end of each of the cooling tubes. A cooling fluid passes through the cooling tubes between the first and second manifolds.
In accordance with another aspect of the present invention, there is provided a motor assembly comprised of a pair of side-by-side, in line motors, each of the motors being essentially identical to the other. Each motor is comprised of a stator having a plurality of evenly spaced, radially oriented, like stator poles that define a gap between adjacent stator poles. The stator poles have side walls that are dimensioned wherein adjacent side walls on adjacent stator poles are parallel. Windings are wound about the stator poles, adjacent windings forming a slot of uniform cross-section therebetween. A rotor element is mounted for rotation relative to the stator. The rotor has a plurality of equally spaced, radially oriented like rotor poles. An elongated cooling tube is disposed within each of the slots between the windings. The cooling tube has a first end and a second end, and is dimensioned to essentially fill the slot between adjacent windings. The motors are fixedly mounted to each other and the cooling tubes are connectable to a source of cooling fluid. A controller controls the operation of the motors, wherein each motor operates independently of the other.
In accordance with another aspect of the present invention, there is provided an electric vehicle, comprised of an electrical energy source, and a fluid-cooled switched reluctance motor for driving wheels on an electric vehicle. The motor is comprised of a stator having a plurality of evenly spaced, radially oriented, like stator poles that define a gap between adjacent stator poles. The stator poles have side walls dimensioned wherein adjacent side walls on adjacent stator poles are parallel. Windings are wound about the stator poles, adjacent windings forming a slot of uniform cross-section therebetween. A rotor element is mounted for rotation relative to the stator. The rotor has a plurality of equally spaced, radially oriented like rotor poles. An elongated cooling tube is disposed within each of the slots between the windings. The cooling tube has a first end and a second end, and is dimensioned to essentially fill the slot between adjacent windings. A coolant system circulates a coolant fluid through the cooling tubes of the motor. A controller controls energy transfer from the energy source to the motor.
In accordance with another aspect of the present invention, there is provided a switch reluctance motor having a stator comprised of a plurality of equally spaced, radially oriented like stator poles wherein stator gaps are formed between adjacent stator poles along the length of the stator. A conductor/cooling assembly is comprised of a pre-formed conductor formed from a single layer of insulated rectangular wire that is formed into a coil. The coil is shaped to mount onto a stator pole in mating fashion. The conductor is positioned within the stator gap, wherein adjacent conductors define an opening or slot in the stator gap. A cooling tube having a cooling passage therethrough is disposed within the stator gap between conductors on adjacent stator poles. The cooling tube has cylindrical distal ends and an intermediate section formed into a shape conforming to a shape of the opening between the adjacent conductors. The intermediate portion essentially fills the opening along the length of the stator gap.
It is an object of the present invention to provide a fluid-cooled, switched reluctance motor assembly for use in an electric powered vehicle.
It is another object of the present invention to provide a motor assembly as described above that is heavy-duty and has high power density.
Another object of the present invention is to provide a fluid-cooled, switched reluctance motor as described above for driving the wheels of an electrically powered vehicle.
Another object of the present invention is to provide a fluid-cooled, switched reluctance motor as described above for direct driving of an electrically powered vehicle.
It is another object of the present invention to provide a motor assembly as described above that is comprised of two switched reluctance motors wherein each motor is independently energizable.
These and other objects will become apparent from the following description of a preferred embodiment of the present invention taken together with the accompanying drawings and the appended claims.
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Dissauer Gerald A.
Fakult Joseph P.
Pengov Wayne A.
Baldor Electric Company
Enad Elvin
Lam Thanh
Thompson & Coburn LLP
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