Rotor of rotary electric machine
A rotary electric machine is provided with a shaft which is a rotary shaft; a laminated core which has a permanent magnet embedded therein and is press-fitted to the shaft; a first member which is a magnetic member and is press-fitted to the shaft so as to hold an end portion of the laminated core; a second member which is a nonmagnetic member and is provided between the end portion of the laminated core and the first member so as to hold an end portion, with respect to the axial direction of the shaft, of the permanent magnet; and at least one of a first gap between the first member and the second member, and a second gap between the laminated core and the second member.
1. A rotor of a rotary electric machine comprising:
a shaft which is a rotary shaft;
a laminated core which has a permanent magnet embedded therein and is press-fitted to the shaft;
a first member which is a magnetic member and is press-fitted to the shaft so as to hold the laminated core;
a second member which is a nonmagnetic member and is provided between an end portion of the laminated core and the first member so as to hold an end portion, with respect to the axial direction of the shaft, of the permanent magnet;
at least one of a first gap between the first member and the second member, and a second gap between the laminated core and the second member;
the first member has a plurality of third convex portions which are arranged in a circle centered on the rotational axis of the shaft and which protrude in the axial direction of the shaft toward the laminated core;
the second member has a plurality of second holes arranged in a circle centered on the rotational axis of the shaft, and
the plurality of third convex portions press the laminated core through the plurality of second holes.
2. The rotor of the rotary electric machine according to claim 1 , wherein
the at least one of the first gap and the second gap includes a space present in the axial direction of the shaft from the end portion of the permanent magnet.
3. The rotor of the rotary electric machine according to claim 1 , wherein the second member is fixed to one of the first member and the end portion of the laminated core.
4. The rotor of the rotary electric machine according to claim 3 , wherein
the second member is formed from one plate, has a first convex portion protruding in the axial direction of the shaft, and has one of the first gap and the second gap on the back side of the first convex portion.
5. The rotor of the rotary electric machine according to claim 4 , wherein the first convex portion comprises a plurality of convex portions arranged in a circle centered on the center of the second member.
6. The rotor of the rotary electric machine according to claim 4 , wherein the first convex portion is in contact with the first member.
7. The rotor of the rotary electric machine according to claim 1 , wherein
the first member has a second convex portion protruding in the axial direction of the shaft toward the laminated core,
the second member has a first hole at the center thereof, and
the second convex portion presses the laminated core through the first hole.
8. The rotor of the rotary electric machine according to claim 7 , wherein the second convex portion is formed in an area surrounding the shaft press-fitted to the first member.
9. The rotor of the rotary electric machine according to claim 1 , wherein the outer diameter of the first member is substantially equal to the outer diameter of the laminated core.
10. The rotor of the rotary electric machine according to claim 1 , wherein the first member is subjected to a balance adjusting process.
11. The rotor of the rotary electric machine according to claim 1 , wherein the difference in thermal expansion coefficient between the first member and the shaft is smaller than the difference in thermal expansion coefficient between the second member and the shaft.