1. A motor, comprising:
a rotor including:
a rotor core;
a plurality of magnets arranged along the circumferential direction of the rotor core, the magnets functioning as first magnetic poles, the number of which is p; and
a plurality of salient poles integrally formed with the rotor core, each salient pole being located between a circumferentially adjacent pair of the magnets with caps in between, and functioning as a second magnetic pole different from the first magnetic poles; and
a stator including:
a stator core arranged to be opposed to the rotor in the radial direction, the stator core having a plurality of radially extending teeth that are arranged at equal intervals in the circumferential direction; and
multiphase coils wound about the teeth;
wherein, the number of teeth, L, is 2\xd7p\xd7m\xd7n (where m is the number of the phases of the coils and n is a natural number);
the stator core includes slots, each slot being located between circumferentially adjacent teeth and extending through the stator core in the axial direction;
the coil of each phase includes a plurality of segment conductors, each of which has slot insertion portions, the slot insertion portions extending through the slots in the axial direction, and the segment conductors being electrically connected to each other by welding ends of
the slot insertion portions protruding from the slots; and
when:
the occupancy angle of each magnet is defined as a first magnetic pole occupancy angle (electrical angle) \u03b81, which ranges from the midpoint of the gap between the magnet and one of the circumferentially adjacent salient poles to the midpoint of the gap between the magnet and the other circumferentially adjacent salient pole, and
the occupancy angle of each salient pole is defined as a second magnetic pole occupancy angle (electrical angle) \u03b82, which ranges from the midpoint of the gap between the salient pole and one of the circumferentially adjacent magnets to the midpoint of the gap between the salient pole and the other circumferentially adjacent magnet,
the following expression is satisfied:
\u03b81+\u03b82=360\xb0, and
the first magnetic pole occupancy angle \u03b81 is set to a value in the range of 210\xb0\u2266\u03b81\u2266270\xb0 such that the torque ripple of the motor is reduced.
2. The motor according to claim 1, wherein a gap is formed between the stator and the rotor, the gap satisfying an expression 1<BA, where A represents the shortest gap distance between the stator and the magnets, and B represents the shortest gap distance between the stator and the salient poles.
3. The motor according to claim 2, wherein the ratio BA is in the range of 1<BA\u22661.6.
4. The motor according to claim 1, wherein the number of the magnets and the number of the salient poles are each an odd number, and
wherein each magnet is located at a position opposite to, or 180\xb0 away from, one of the salient poles.
5. The motor according to claim 1, wherein a continuous portion and a gap are formed between the distal ends of each circumferentially adjacent pair of the teeth, the continuous portion connecting the teeth together.
6. The motor according to claim 5, wherein:
the stator core is formed by laminating a plurality of lamination members in the axial direction; and
the continuous portion has a recess that is recessed in the axial direction by pressing, the recesses forming the gap.
7. The motor according to claim 5, wherein:
the stator core is formed by alternately laminating first lamination members and second lamination members,
each first lamination member has the gap between the distal ends of each circumferentially adjacent pair of the teeth, and
each second lamination member has the continuous portion between the distal ends of each circumferentially adjacent pair of the teeth.
8. The motor according to claim 5, wherein:
the stator core is formed by laminating a plurality of lamination members in the axial direction; and
in each lamination member, the continuous portions and the gaps are alternately formed in the circumferential direction, the lamination members being laminated such that the continuous portions and the gaps are alternately arranged in the axial direction.
9. The motor according to claim 1, wherein a first auxiliary groove is formed in a surface of each salient pole that is opposed to the teeth, each first auxiliary groove having a pair of side surfaces facing each other in the circumferential direction.
10. The motor according to claim 9, wherein, when the opening degree of each salient pole is represented by Yk\u03b8(\xb0), the opening degree of the distal end of each tooth is represented by T\u03b8(\xb0), and the number of the teeth is represented by L,
in each salient pole, the angle D1 from the circumferential center line to the side surface of the first auxiliary groove closer to the circumferential center line satisfies the following expression:
D1=T\u03b8+(a\u22121)\xd7360(\xb0)L\u2212Yk\u03b82 (where a is a natural number).
11. The motor according to claim 10, wherein the first auxiliary groove in each salient pole is one of a pair of first auxiliary grooves that are formed along the circumferential direction to be symmetrical with respect to the circumferential center line of the salient pole.
12. The motor according to claim 10, wherein:
a second auxiliary groove is formed in a surface of each salient pole that is opposed to the teeth, each second auxiliary groove having a pair of side surfaces facing each other in the circumferential direction; and
in each salient pole, the angle D2 from the circumferential center line to the side surface of the second auxiliary groove closer to the circumferential center line satisfies the following expression:
D2=D1+360(\xb0)L.
13. The motor according to claim 12, wherein the second auxiliary groove in each salient pole is one of a pair of second auxiliary grooves that are formed along the circumferential direction to be symmetrical with respect to the circumferential center line of the salient pole.
14. A motor, comprising:
a rotor including:
a rotor core;
a plurality of magnets arranged along the circumferential direction of the rotor core, the magnets functioning as first magnetic poles, the number of which is p; and
a plurality of salient poles integrally formed with the rotor core, each salient pole being located between a circumferentially adjacent pair of the magnets with gaps in between, and functioning as a second magnetic pole different from the first magnetic poles; and
a stator including:
a stator core arranged to be opposed to the rotor in the radial direction, the stator core having a plurality of radially extending teeth that are arranged at equal intervals in the circumferential direction; and
multiphase coils wound about the teeth;
wherein, the number of teeth, L, is 2\xd7p\xd7m\xd7n (where m is the number of the phases of the coils and n is a natural number);
the stator core includes slots, each slot being located between circumferentially adjacent teeth and extending through the stator core in the axial direction;
the coil of each phase includes a plurality of segment conductors, each of which has slot insertion portions, the slot insertion portions extending through the slots in the axial direction, and the segment conductors being electrically connected to each other by welding ends of the slot insertion portions protruding from the slots; and
when:
the occupancy angle of each magnet is defined as a first magnetic pole occupancy angle (electrical angle) \u03b81, which ranges from the midpoint of the gap between the magnet and one of the circumferentially adjacent salient poles to the midpoint of the gap between the magnet and the other circumferentially adjacent salient pole, and
the occupancy angle of each salient pole is defined as a second magnetic pole occupancy angle (electrical angle) \u03b82, which ranges from the midpoint of the gap between the salient pole and one of the circumferentially adjacent magnets to the midpoint of the gap between the salient pole and the other circumferentially adjacent magnet,
the following expression is satisfied:
\u03b81+\u03b82=360\xb0, and
the first magnetic pole occupancy angle \u03b81 is set to a value in the range of 150\xb0\u2266\u03b81\u2266180\xb0 such that the torque ripple of the motor is reduced.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. (canceled)
2. (canceled)
3. (canceled)
4. (canceled)
5. (canceled)
6. (canceled)
7. A method for using a strap to secure a shutter to a track using bolts and fasteners, the track having a thickness and width for receiving the bolts, the shutter being used to protect a building opening, and the method comprising:
using a rectangular-shaped flexible material; and
using a plurality of openings within the material for holding the bolts, wherein the openings within the material are equidistant from each other and the same size.
8. A strap for securing a shutter to a track using bolts and fasteners, the track having a thickness and width for receiving the bolts, the shutter being used to protect a building opening, and the strap comprising:
a rectangular-shaped flexible material; and
a plurality of openings within the material for holding the bolts, wherein the openings within the material are equidistant from each other and the same size.
9. The strap of claim 8, wherein the bolts are inserted in the openings within the material.
10. The strap of claim 8, wherein the bolts are inserted in the openings within the material and the bolts are mounted in the track.
11. The strap of claim 8, wherein the bolts are inserted in the openings within the material, the bolts are mounted in the track, and the shutter is mounted on the bolts.
12. The strap of claim 8, wherein the bolts are inserted in the openings within the material, the bolts are mounted in the track, the shutter is mounted on the bolts, and the fasteners are used to secure the shutter.