Rotor manufacturing apparatus and rotor manufacturing method
A resin injection apparatus configured to manufacture a rotor of a rotary electric machine includes a resin injector having an ejection port for ejecting a resin, and a runner having a charging port connectable to the ejection port, and a plurality of ejection ports communicating with the charging port and disposed at positions associated with hole portions of a rotor core where magnets are disposed.
1. A rotor manufacturing apparatus configured to manufacture a rotor of a rotary electric machine, the rotor manufacturing apparatus comprising:
a resin injector having a first ejection port for ejecting a resin;
a runner having a charging port connectable to the first ejection port, and a plurality of second ejection ports communicating with the charging port and disposed at positions associated with hole portions of a rotor core where magnet members are disposed; and
a placement portion on which the rotor core is placed, wherein:
the runner is detachably attached to the placement portion,
the placement portion includes:
a support portion configured such that the runner is attachable to and detachable from the support portion, and configured to position and support the runner when the runner is attached;
a placement table disposed below the support portion, configured such that the rotor core is placeable on the placement table, and configured to ascend or descend relative to the support portion; and
a driving unit configured to drive the placement table to move, and
the resin injector is configured to inject the resin by causing the placement table on which the rotor core is placed to ascend so that the hole portions of the rotor core face the second ejection ports of the runner.
2. The rotor manufacturing apparatus according to claim 1 , wherein
the rotor core is formed so as to have a first number of the hole portions in a circumferential direction,
the runner has a second number of the second ejection ports, the second number being smaller than the first number, and
the driving unit is configured to drive the placement table to rotate.
3. The rotor manufacturing apparatus according to claim 1 , further comprising:
a first temperature control device configured to control a temperature of the resin in the resin injector; and
a second temperature control device configured to control a temperature of the resin in the runner.
4. The rotor manufacturing apparatus according to claim 1 , wherein the runner can either be a first runner or a second runner, the second runner being structured such that a second radius from the charging port to the second ejection ports is different from a first radius from the charging port to the second ejection ports of the first runner.
5. The rotor manufacturing apparatus according to claim 1 , wherein
the resin injector includes a first valve configured to open or close the first ejection port, and
the runner includes second valves configured to open or close the second ejection ports.
6. The rotor manufacturing apparatus according to claim 1 , wherein the runner is formed such that an amount of the resin to fill a part from the charging port to the plurality of second ejection ports is larger than an amount of the resin to be ejected at one time from the plurality of second ejection ports toward the hole portions.
7. A rotor manufacturing method for manufacturing a rotor of a rotary electric machine by disposing magnet members in hole portions of a rotor core and injecting and curing a resin to fix the magnet members to the rotor core, the rotor manufacturing method comprising:
an injection apparatus placement step for placing the rotor core on a placement portion; and
a resin injection step for attaching, to the placement portion, a runner attachable to and detachable from the placement portion, connecting, to a charging port of the runner, a first ejection port for ejecting the resin in a resin injector, and injecting the resin from the resin injector into the hole portions of the rotor core through a plurality of second ejection ports disposed at positions on the runner that are associated with the hole portions of the rotor core, wherein:
the placement portion includes:
a support portion configured such that the runner is attachable to and detachable from the support portion, and configured to position and support the runner when the runner is attached;
a placement table disposed below the support portion, configured such that the rotor core is placeable on the placement table, and configured to ascend or descend relative to the support portion; and
a driving unit configured to drive the placement table to move,
in the injection apparatus placement step, the placement table on which the rotor core is placed is caused to ascend so that the hole portions of the rotor core face the second ejection ports of the runner, and
in the resin injection step, the resin from the resin injector is injected into the hole portions of the rotor core through the plurality of second ejection ports of the runner.
8. The rotor manufacturing method according to claim 7 , wherein
the rotor core is formed so as to have a first number of the hole portions in a circumferential direction,
the runner has a second number of the second ejection ports, the second number being smaller than the first number,
the driving unit is configured to drive the placement table to rotate, and
in the resin injection step,
the resin is injected from the plurality of second ejection ports of the runner into the second number of the hole portions of the rotor core,
the driving unit causes the placement table to descend so that the rotor core descends, causes the placement table to rotate so that the rotor core rotates, and causes the placement table to ascend so that the rotor core ascends, and
the resin is injected from the plurality of second ejection ports of the runner into the hole portions of the rotor core where the resin is not injected.
9. The rotor manufacturing method according to claim 7 , wherein
the runner can either be a first runner or a second runner, the second runner being structured such that a second radius from the charging port to the second ejection ports is different from a first radius from the charging port to the second ejection ports of the first runner, and
the first runner or the second runner is selectively attachable to the placement portion.