Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-04-22
2001-06-26
Waks, Joseph (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S179000, C310S198000
Reexamination Certificate
active
06252324
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention relates generally to a rotating induction apparatus and more specifically to a method of winding a rotating induction apparatus.
BACKGROUND OF THE INVENTION
In a rotating induction apparatus, a current of electrical charge generated within a magnetic field experiences a force perpendicular to the flow of charge and to the lines of force of the magnetic field. If a conductor is forced through a magnetic field by an external prime mover, an electrical current is caused to flow; this is the principle of the operation of an electrical generator. When an electrical current flows through a conductor in a magnetic field, a force is applied to the conductor; this is the principle of the operation of an electrical motor.
In an alternating current (AC) rotating induction apparatus, a rotating magnetic field is produced by the stator or stationary portion of the apparatus. This rotating magnetic field interacts with current carried by conductors of the rotor, causing the rotor to turn. It also produces currents in the rotor conductors by transformer action. Thus, the rotor needs no connections to an electrical supply and is simply supported by bearings which allow free rotation.
The rotating magnetic field is produced by coils, that are made of coils of wire, suitably positioned on the stator. Each coil produces a varying magnetic field of fixed orientation when energized with an AC current. By positioning several coils of differing orientations on a single stator and energizing the coils with alternating currents of differing phase, a rotating magnetic field is produced, which is the sum of the time-varying fixed orientation magnetic fields generated by each coil per phase.
For a rotating induction apparatus having greater than three phases, the coils once wound around the stator may become cumbersome and difficult to wind. As the number of phases increases, the coils become increasingly cumbersome and difficult to wind.
SUMMARY OF THE INVENTION
Thus, a need has arisen for an improved method for winding a rotating induction apparatus.
In accordance with an embodiment of the present invention, a method of winding an electrical rotating apparatus comprises: determining a desired number of phases that is output from the electrical rotating apparatus, wherein the number of phases is greater than three; providing a stator; providing a rotor electromagnetically coupled to a magnetic field generated by the stator; providing a plurality of coils, wherein the plurality of coils includes a first coil and a second coil, wherein the plurality of coils are wound around the stator; placing the first coil on the right side of the stator; and placing the second coil on the left side of the stator.
In accordance with another embodiment of the present invention, an electrical rotating apparatus comprises: a number of phases, wherein the number of phases is output from the electrical rotating apparatus and the number of phases is greater than three; a stator; a rotor electromagnetically coupled to a magnetic field generated by the stator; and coils comprising a first coil and a second coil, wherein the first and second coils are wound around the stator, wherein the first coil is on a right side of the stator and the second coil is on a left side of the stator.
In accordance with another embodiment of the present invention, an electrical rotating apparatus comprises: a number of phases, wherein the number of phases is output from the electrical rotating apparatus and the number of phases is greater than three; a stator comprising a plurality of slots greater than or equal to twice the number of phases, the plurality of slots comprising a first slot and a second slot; a rotor electromagnetically coupled to a magnetic field generated by the stator; coils that are wound around the stator, wherein the coils comprise: a first coil coupled to the first slot and the second slot; and a second coil coupled to the first slot and the second slot, wherein the first coil is on a right side of the stator and the second coil is on a left side of the stator.
A technical advantage of the present invention is that it substantially reduces the problems associated with winding a rotating induction apparatus having more than three phases. Another technical advantage of the present invention is that it spaces the coils, such that the coils are distributed evenly around the stator.
Other technical advantages of the present invention are set forth in or will be apparent from the drawings and the description of the invention which follows, or may be learned from the practice of the invention.
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Baker & Botts L.L.P.
Borealis Technical Limited
Waks Joseph
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