Back to results
US 2010/0301695 A1Published application
Rotor and Motor
AssigneeAsmo Co., Ltd.
InventorsYoji YAMADA, Seiya YOKOYAMA, Shigemasa KATO, Yoshiaki TAKEMOTO, Yoko TATEISHI
Life of this patent
Estimating the term…
Abstract
A motor includes a rotor and a stator. The rotor includes a plurality of magnets, which function as first magnetic poles, and salient poles, which function as second magnetic poles. A ratio X1:X2 of a quantity X1 of magnetic pole portions of the rotor, which is the sum of the quantity of the magnets and the quantity of the salient poles, and the quantity X2 of slots is 2n:3n (n being a natural number). The sum of a magnetic pole occupying angle θ1 of the magnet and a magnetic pole occupying angle θ2 of the salient pole is 360°. The magnetic pole occupying angle θ1 is set in a range of 180°<θ1≦230°.
Claims29
A motor comprising:
- a rotor including a rotor core, a plurality of magnets arranged along a circumferential direction of the rotor core to function as first magnetic poles, and salient poles formed integrally with the rotor core and arranged between adjacent ones of the magnets in the circumferential direction to function as second magnetic poles;
- and
- a stator arranged facing toward the rotor and including a plurality of slots;
- wherein the magnets and salient poles each have a quantity in which the quantities sum together to a quantity x1 of magnetic pole portions of the rotor, and the slots are in a quantity x2, in which a ratio x1:x2 of the quantity of the magnetic pole portions to the quantity of the slots is 2n:3n (n being a natural number);
- when an electrical angle corresponding to an angular range from an initiating point, which is set between each magnet and the salient pole that is adjacent to one side of the magnet in the circumferential direction, to a terminating point, which is set between the magnet and the salient pole that is adjacent to the other side of the magnet in the circumferential direction, is defined as a magnetic pole occupying angle θ1 of each of the magnets, and an electrical angle corresponding to an angular range between the initiating point and the terminating point on two sides of each salient pole in the circumferential direction is defined as a magnetic pole occupying angle θ2 of each of the salient poles, in which the magnetic pole occupying angle θ1 and the magnetic pole occupying angle θ2 sum to 360°;
- and
- the magnetic pole occupying angle θ1 is set in a range of 180°<θ1≦230°.
4 more elements
A motor comprising:
- a rotor including a rotor core, a plurality of magnets arranged along a circumferential direction of the rotor core to function as first magnetic poles, and salient poles formed integrally with the rotor core and arranged between adjacent ones of the magnets in the circumferential direction to function as second magnetic poles;
- and
- a stator arranged facing toward the rotor and including a plurality of slots;
- wherein the magnets and salient poles each have a quantity in which the quantities sum together to a quantity x1 of magnetic pole portions of the rotor, and the slots are in a quantity x2, in which a ratio x1:x2 of the quantity of the magnetic pole portions to the quantity of the slots is 3n−1:3n (n being an odd number that is greater than or equal to 3) or 3n−2:3n (n being an even number that is greater than or equal to 4);
- when an electrical angle corresponding to an angular range from an initiating point, which is set between each magnet and the salient pole that is adjacent to one side of the magnet in the circumferential direction, to a terminating point, which is set between the magnet and the salient pole that is adjacent to the other side of the magnet in the circumferential direction, is defined as a magnetic pole occupying angle θ1 of each of the magnets, and an electrical angle corresponding to an angular range between the initiating point and the terminating point on two sides of each salient pole in the circumferential direction is defined as a magnetic pole occupying angle θ2 of each of the salient poles, a sum of the magnetic pole occupying angle θ1 and the magnetic pole occupying angle θ2 is 360°;
- and
- the magnetic pole occupying angle θ1 is set in a range of 180°<θ1≦210°.
4 more elements
A motor comprising:
- a rotor including a rotor core, a plurality of magnets arranged along a circumferential direction of the rotor core to function as first magnetic poles, and salient poles formed integrally with the rotor core and arranged between adjacent ones of the magnets in the circumferential direction to function as second magnetic poles;
- and
- a stator arranged facing toward the rotor and including a plurality of slots;
- wherein the magnets and salient poles each have a quantity in which the quantities sum together to a quantity x1 of magnetic pole portions of the rotor, and the slots are in a quantity x2, in which a ratio x1:x2 of the quantity of the magnetic pole portions to the quantity of the slots is 3n+1:3n (n being an odd number) or 3n+2:3n (n being an even number);
- when an electrical angle corresponding to an angular range from an initiating point, which is set between each magnet and the salient pole that is adjacent to one side of the magnet in the circumferential direction, to a terminating point, which is set between the magnet and the salient pole that is adjacent to the other side of the magnet in the circumferential direction, is defined as a magnetic pole occupying angle θ1 of each of the magnets, and an electrical angle corresponding to an angular range between the initiating point and the terminating point on two sides of each salient pole in the circumferential direction is defined as a magnetic pole occupying angle θ2 of each of the salient poles, a sum of the magnetic pole occupying angle θ1 and the magnetic pole occupying angle θ2 is 360°;
- and
- the magnetic pole occupying angle θ1 is set in a range of 180°<θ1≦200°.
4 more elements
A motor comprising:
- a rotor including a rotor core, a plurality of magnets arranged along a circumferential direction of the rotor core to function as first magnetic poles, and salient poles formed integrally with the rotor core and arranged between adjacent ones of the magnets in the circumferential direction to function as second magnetic poles;
- and
- a stator arranged facing toward the rotor and including a plurality of slots;
- wherein the magnets and salient poles each have a quantity in which the quantities sum together to a quantity x1 of magnetic pole portions of the rotor, and the slots are in a quantity x2, in which a ratio x1:x2 of the quantity of the magnetic pole portions to the quantity of the slots is 3n−1:3n (n being an odd number that is greater than or equal to 3) or 3n−2:3n (n being an even number that is greater than or equal to 4);
- when an electrical angle corresponding to an angular range from an initiating point, which is set between each magnet and the salient pole that is adjacent to one side of the magnet in the circumferential direction, to a terminating point, which is set between the magnet and the salient pole that is adjacent to the other side of the magnet in the circumferential direction, is defined as a magnetic pole occupying angle θ1 of each of the magnets, and an electrical angle corresponding to an angular range between the initiating point and the terminating point on two sides of each salient pole in the circumferential direction is defined as a magnetic pole occupying angle θ2 of each of the salient poles, a sum of the magnetic pole occupying angle θ1 and the magnetic pole occupying angle θ2 is 360°;
- and
- the magnetic pole occupying angle θ1 is set in a range of 180°<θ1≦220°.
4 more elements
A motor comprising:
- a rotor including a rotor core, a plurality of magnets arranged along a circumferential direction of the rotor core to function as first magnetic poles, and salient poles formed integrally with the rotor core and arranged between adjacent ones of the magnets in the circumferential direction to function as second magnetic poles, a first clearance being formed between the magnet and the salient pole that are adjacent to each other in the circumferential direction;
- and
- a stator arranged facing toward the rotor spaced apart by a second clearance in a radial direction;
- wherein the second clearance has a shortest radial distance A at locations corresponding to the magnets and a shortest radial distance B at locations corresponding to the salient poles, and a ratio B/A is set in a range of 0.3≦B/A<1.
1 more element
A rotor comprising:
- a rotor core;
- a plurality of magnets arranged along a circumferential direction of the rotor core to function as first magnetic poles;
- and
- a salient pole formed integrally with the rotor core and arranged between adjacent ones of the magnets in the circumferential direction to function as a second magnetic pole, a first clearance being formed between the magnets and the salient pole;
- wherein at least part of a surface of the salient pole and at least part of surfaces of the magnets lie along a reference circumference, and the surface of at least one of the salient pole and the magnets is gradually spaced apart from the reference circumference towards two circumferential ends of the surface so as to have a convex shape.
2 more elements
A rotor comprising:
- a rotor core;
- a plurality of magnets arranged along a circumferential direction of the rotor core to function as first magnetic poles;
- and
- salient poles formed integrally with the rotor core and arranged between adjacent ones of the magnets in the circumferential direction to function as second magnetic poles, a first clearance being formed between the magnet and the salient pole that are adjacent to each other in the circumferential direction;
- wherein the salient poles relatively project outward in a radial direction from the magnets, cover members covering the magnets are hooked to the rotor core between adjacent ones of the salient poles, and the cover members are arranged so as not to project outward in the radial direction from the salient poles.
2 more elements
Dependencies are inferred from the claim text.