Rotor for rotary electric machine
A rotor includes: a tubular retaining ring opened on an outer side thereof in an axial direction and covering a coil end portion of each of coils; and rotor baffles and insulation baffles alternately connected in a circumferential direction and partitioning a space in the retaining ring into a first space and a second space, the first space is formed over an entire circumference around a shaft, each rotor baffle includes, at a part thereof on a radially outer side of which a jumper portion is present, a first tapered shape part tilted so as to be more apart from the jumper portion toward a center side in the axial direction of the rotor.
1. A rotor for a rotary electric machine, the rotor including a shaft, a rotor core, and coils incorporated in slots of the rotor core, the rotor comprising:
a tubular retaining ring opened on an outer side thereof in an axial direction and covering a coil end portion of each coil; and
rotor baffles and insulation baffles alternately connected in a circumferential direction and partitioning a space in the retaining ring into a first space on an inner side in a radial direction where the coil end portion is not present, and a second space on an outer side in the radial direction where a center portion in the circumferential direction of the coil end portion is present, wherein
each rotor baffle is disposed on an inner side in the radial direction of a portion, of the corresponding coil end portion, at which a jumper portion is formed,
the insulation baffles are disposed along end surfaces on an inner side in the radial direction of extending portions of a plurality of conductors forming the coil end portions,
a gap is present between an end surface of the rotor core and an end, on a center side of the rotor, of each insulation baffle,
the first space is formed over an entire circumference around the shaft, and
the rotor baffle includes, at a part thereof on a radially outer side of which the jumper portion is present, a first tapered shape part tilted so as to be more apart from the jumper portion toward a center side in the axial direction of the rotor.
2. The rotor for a rotary electric machine according to claim 1 , wherein the first tapered shape part is disposed such that the first space has a larger diameter on an outer side in the axial direction than on the center side in the axial direction.
3. The rotor for a rotary electric machine according to claim 2 , wherein each rotor baffle includes a second tapered shape part tilted from an end on the center side in the axial direction of the first tapered shape part so as to be closer to an outer circumferential surface side of the rotor core toward the center side in the axial direction of the rotor.
4. The rotor for a rotary electric machine according to claim 3 , the rotor further comprising:
a first gas passage which is provided on an outer side in the radial direction of each rotor baffle and through which gas in the second space is discharged to outside; and
a second gas passage extending in the axial direction and provided on an inner side in the radial direction of each of the conductors forming the coils inserted in the slots.
5. The rotor for a rotary electric machine according to claim 4 , wherein, at the jumper portion, the plurality of conductors overlap with each other in the axial direction with gas spaces therebetween.
6. The rotor for a rotary electric machine according to claim 3 , wherein, at the jumper portion, the plurality of conductors overlap with each other in the axial direction with gas spaces therebetween.
7. The rotor for a rotary electric machine according to claim 2 , the rotor further comprising:
a first gas passage which is provided on an outer side in the radial direction of each rotor baffle and through which gas in the second space is discharged to outside; and
a second gas passage extending in the axial direction and provided on an inner side in the radial direction of each of the conductors forming the coils inserted in the slots.
8. The rotor for a rotary electric machine according to claim 7 , wherein, at the jumper portion, the plurality of conductors overlap with each other in the axial direction with gas spaces therebetween.
9. The rotor for a rotary electric machine according to claim 2 , wherein, at the jumper portion, the plurality of conductors overlap with each other in the axial direction with gas spaces therebetween.
10. The rotor for a rotary electric machine according to claim 2 , wherein a cross-sectional shape, of each rotor baffle, that is perpendicular to the axial direction is any one of:
a shape having linear portions extending toward an outer side in the radial direction from both ends in the circumferential direction of a circular arc portion concentric with a cross section perpendicular to the axial direction of an outer circumferential surface of the rotor core;
a linear shape;
a circular arc shape projecting to an inner side in the radial direction;
a mountain-like shape projecting to the inner side in the radial direction;
a trapezoidal shape projecting to the inner side in the radial direction;
a wing shape projecting to the inner side in the radial direction and protruding further to the inner side in the radial direction on a downstream side in rotation direction than on a upstream side in rotation direction, in a rotation direction of the rotor.
11. The rotor for a rotary electric machine according to claim 1 , wherein each rotor baffle includes a second tapered shape part tilted from an end on the center side in the axial direction of the first tapered shape part so as to be closer to an outer circumferential surface side of the rotor core toward the center side in the axial direction of the rotor.
12. The rotor for a rotary electric machine according to claim 11 , the rotor further comprising:
a first gas passage which is provided on an outer side in the radial direction of each rotor baffle and through which gas in the second space is discharged to outside; and
a second gas passage extending in the axial direction and provided on an inner side in the radial direction of each of the conductors forming the coils inserted in the slots.
13. The rotor for a rotary electric machine according to claim 12 , wherein, at the jumper portion, the plurality of conductors overlap with each other in the axial direction with gas spaces therebetween.
14. The rotor for a rotary electric machine according to claim 11 , wherein, at the jumper portion, the plurality of conductors overlap with each other in the axial direction with gas spaces therebetween.
15. The rotor for a rotary electric machine according to claim 1 , the rotor further comprising:
a first gas passage which is provided on an outer side in the radial direction of each rotor baffle and through which gas in the second space is discharged to outside; and
a second gas passage extending in the axial direction and provided on an inner side in the radial direction of each of the conductors forming the coils inserted in the slots.
16. The rotor for a rotary electric machine according to claim 15 , wherein, at the jumper portion, the plurality of conductors overlap with each other in the axial direction with gas spaces therebetween.
17. The rotor for a rotary electric machine according to claim 1 , wherein, at the jumper portion, the plurality of conductors overlap with each other in the axial direction with gas spaces therebetween.
18. The rotor for a rotary electric machine according to claim 1 , wherein a cross-sectional shape, of each rotor baffle, that is perpendicular to the axial direction is any one of:
a shape having linear portions extending toward an outer side in the radial direction from both ends in the circumferential direction of a circular arc portion concentric with a cross section perpendicular to the axial direction of an outer circumferential surface of the rotor core;
a linear shape;
a circular arc shape projecting to an inner side in the radial direction;
a mountain-like shape projecting to the inner side in the radial direction;
a trapezoidal shape projecting to the inner side in the radial direction;
a wing shape projecting to the inner side in the radial direction and protruding further to the inner side in the radial direction on a downstream side in rotation direction than on a upstream side in rotation direction, in a rotation direction of the rotor.
19. The rotor for a rotary electric machine according to claim 1 , wherein each rotor baffle is disposed so as to be shifted to a downstream side in rotation direction in a rotation direction of the rotor with respect to the corresponding coil end portion.
20. The rotor for a rotary electric machine according to claim 1 , wherein a plurality of the rotor baffles are provided on an inner side in the radial direction of one of the jumper portions.