The disclosure is directed to a motor/generator including a magnetic circuit that is created between a rotor and stator through a first air gap and a second air gap so that a magnetic field (magnetic flux) passes through two parts of the edges of multiple stator teeth parts. A first protruding end p
The disclosure is directed to a motor/generator including a magnetic circuit that is created between a rotor and stator through a first air gap and a second air gap so that a magnetic field (magnetic flux) passes through two parts of the edges of multiple stator teeth parts. A first protruding end part and a second protruding end part of the stator teeth parts which face each air gap may contain different shapes with regard to the circumferential direction of the rotor. These shapes and orientation of the first and second protruding end parts may reduce the cogging torque of the motor/generator.
대표청구항▼
The invention claimed is: 1. A motor/generator comprising: one or more rotors having a permanent magnet; and one or more stators forming a plurality of stator teeth parts, the stator teeth parts of the one or more stators including: a plurality of first protruding end parts that faces a first surfa
The invention claimed is: 1. A motor/generator comprising: one or more rotors having a permanent magnet; and one or more stators forming a plurality of stator teeth parts, the stator teeth parts of the one or more stators including: a plurality of first protruding end parts that faces a first surface of the one or more rotors via a first air gap; and a plurality of second protruding end parts that faces a second surface of the one or more rotors via a second air gap with a total number of the second protruding end parts being equal to a total number of the first protruding end parts, and each of the second protruding end parts having a shape in a circumferential direction of the one or more rotors that is different from a shape of a corresponding one of the first protruding end parts in the circumferential direction of the one or more rotors; and a coil mounted on each of the stator teeth parts that creates a magnetic circuit via a magnetic field generated by the permanent magnet and the coil, the one or more stators creating the magnetic circuit passing through the first air gap and the second air gap so that the magnetic field passes through at least one of the first protruding end parts and at least one of the second protruding end parts. 2. The motor/generator of claim 1, wherein a width of each of the second protruding end parts in the circumferential direction of the one or more rotors is different from a width of a corresponding one of the first protruding end parts. 3. The motor/generator of claim 1, wherein a degree of protrusion of each of the first protruding end parts towards a first side of the circumferential direction of the one or more rotors is smaller than a degree of protrusion towards a second side of the circumferential direction of the one or more rotors, and a degree of protrusion of each of the second protruding end parts towards the first side of the circumferential direction of the one or more rotor is larger than a degree of protrusion towards the second side of the circumferential direction of the rotor. 4. The motor/generator of claim 1, wherein the one or more stators comprises first and second stators, with the first stator having the stator teeth parts with the first protruding end parts arranged in the circumferential direction of the one or more rotors and the second stator having the stator teeth parts with the second protruding end parts arranged in the circumferential direction of the one or more rotors, each of the first protruding end parts having the same shape in the circumferential direction of the rotor, and each of the second protruding end parts having the same shape in the circumferential direction of the rotor. 5. The motor/generator of claim 1, wherein the one or more stators comprises first and second stators, with the first stator having the stator teeth parts with the first protruding end parts arranged in the circumferential direction of the one or more rotors and the second stator having the stator teeth parts with the second protruding end parts arranged in the circumferential direction of the one or more rotors, adjacent ones of the first protruding end parts having different shapes, and adjacent ones of the second protruding end parts having different shapes. 6. The motor/generator of claim 1, wherein the one or more stators comprise two stators positioned opposite to each other on both sides of one rotor, and each of the two stators includes the stator teeth parts arranged in the circumferential direction of the one rotor and the center lines of the stator teeth parts disposed opposite to each other are placed in the same position. 7. The motor/generator of claim 1, wherein a size of each of the first protruding end parts is within a range such that a distance between adjacent permanent magnets divided by the width of the first protruding end part is less than 0.5. 8. The motor/generator of claim 1, wherein the one or more rotors equals one rotor when the one or more stators equals two stators. 9. The motor/generator of claim 1, wherein the one or more rotors equals two rotors when the one or more stators equals one stator to create the first and second air gaps. 10. A method for generating a magnetic field, the method comprising: rotating one or more rotors separated from one or more stators by a first air gap and a second air gap disposed in different surfaces between the one or more rotors and the one or more stators, with a plurality of first protruding end parts facing a first surface of the one or more rotors via the first air gap and a plurality of second protruding end parts facing a second surface of the one or more rotors via the second air gap with a total number of the first protruding end parts being equal to a total number of the second protruding end parts, and each of the second protruding end parts having a shape in the circumferential direction of the one or more rotor that is different from a shape of a corresponding one of the first protruding end parts in the circumferential direction of the one or more rotors; and creating a magnetic circuit with a coil mounted on each of a plurality of stator teeth parts of one or more stators and a permanent magnet of one or more rotors via a magnetic field generated by the permanent magnet and the coil, with the magnetic circuit passing through the first and second air gaps, at least one of the first protruding end parts and at least one of the second protruding end parts. 11. The method of claim 10, wherein rotating one or more rotors comprises rotating one rotor between two stators. 12. The method of claim 10, wherein rotating one or more rotors comprises rotating two rotors on either side of one stator. 13. The method of claim 10, wherein the magnetic circuit is created with a width of each of the second protruding end parts in the circumferential direction of the one or more rotors being different from a width of a corresponding one of the first protruding end parts. 14. The method of claim 10, wherein the magnetic circuit is created utilizing a degree of protrusion of each of the first protruding end parts towards a first side of the circumferential direction of the one or more rotors that is smaller than a degree of protrusion towards a second side of the circumferential direction of the one or more rotors and a degree of protrusion of each of the second protruding end parts towards the first side of the circumferential direction of the one or more rotor that is larger than a degree of protrusion towards the second side of the circumferential direction of the rotor. 15. The method of claim 10, wherein the magnetic circuit is created with first and second stators of the one or more stators, with the first stator having the stator teeth parts with the first protruding end parts arranged in the circumferential direction of the one or more rotors and the second stator having the stator teeth parts with the second protruding end parts arranged in the circumferential direction of the one or more rotors, each of the first protruding end parts having the same shape in the circumferential direction of the rotor, and each of the second protruding end parts having the same shape in the circumferential direction. 16. The method of claim 10, wherein the magnetic circuit is created with first and second stators of the one or more stators, with the first stator having the stator teeth parts with the first protruding end parts arranged in the circumferential direction of the one or more rotors and the second stator having the stator teeth parts with the second protruding end parts arranged in the circumferential direction of the one or more rotors, adjacent ones of the first protruding end parts having different shapes, and adjacent ones of the second protruding end parts having different shapes. 17. The method of claim 10, wherein the magnetic circuit is created with two stators positioned opposite to each other on both sides of one rotor, and each of the two stators comprises the stator teeth parts arranged in the circumferential direction of the one rotor and the center lines of the stator teeth parts disposed opposite to each other are placed in the same position. 18. The method of claim 10, wherein the magnetic circuit is created utilizing a size of each of the first protruding end parts that is within a range such that the distance between adjacent permanent magnets divided by the width of the first protruding end part is less than 0.5.
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이 특허에 인용된 특허 (8)
Lin Shou-Mei,TWX ; Wang Yu-Yen,TWX, Double-sided, non-iron core, brushless, axial magnetic field permanent-magnet type DC motor.
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