Electric rotating machine

摘要

A rotor includes a rotor core and permanent magnets each of which is received in a corresponding slot of the rotor core with its magnetization direction being oblique to a radial direction of the rotor core. Each of the permanent magnets has a first corner portion positioned radially outermost and a second corner portion positioned radially innermost. For each of the permanent magnets, there are formed first and second gaps respectively between the first corner portion and the inner surface of the corresponding slot and between the second corner portion and the inner surface of the corresponding slot in a reference direction of the permanent magnet. The rotor core also has, for each of the permanent magnets, supporting portions each of which abuts and thereby supports, in the reference direction, a predetermined portion of the permanent magnet which is positioned away from both the first and second corner portions.

主权项

1. An electric rotating machine comprising:
a stator; and a rotor that is rotatably disposed with respect to the stator, the rotor including a rotor core that has a plurality of slots formed therein and a plurality of permanent magnets each of which is received in a corresponding one of the slots of the rotor core, wherein:
each of the permanent magnets has a plurality of corner portions that include a first corner portion and a second corner portion,among the plurality of corner portions, the first corner portion is positioned closest to a radially outer periphery of the rotor core, and the second corner portion is positioned furthest from the radially outer periphery of the rotor core,each of the permanent magnets is arranged in the corresponding slot of the rotor core so that a magnetization direction of the permanent magnet is oblique to a radial direction of the rotor core,for each of the permanent magnets, there are formed first and second gaps respectively between the first corner portion of the permanent magnet and an inner surface of the corresponding slot of the rotor core and between the second corner portion of the permanent magnet and the inner surface of the corresponding slot in a reference direction of the permanent magnet, the reference direction being perpendicular to both the magnetization direction of the permanent magnet and an axial direction of the rotor core,the first gap is made up of a first void space formed around the first corner portion of the permanent magnet in the corresponding slot of the rotor core, and the second gap is made up of a second void space formed around the second corner portion of the permanent magnet in the corresponding slot, and wherein:
each of the permanent magnets has an opposite pair of first and second side surfaces that are opposite to each other in the reference direction of the permanent magnet,for each of the permanent magnets, the plurality of corner portions of the permanent magnet include the first and second corner portions, a third corner portion and a fourth corner portion,the first and third corner portions are respectively formed at opposite ends of the first side surface of the permanent magnet in the magnetization direction of the permanent magnet,the second and fourth corner portions are respectively formed at opposite ends of the second side surface of the permanent magnet in the magnetization direction of the permanent magnet, andthe rotor core also has, for each of the permanent magnets, a first supporting portion and a second supporting portion, wherein the first supporting portion about and thereby supports a third corner portion-side end portion of the first side surface of the permanent magnet in the reference direction of the permanent magnet, the third corner portion-side end portion of the first surface having a width in the magnetization direction of the permanent magnet which is not greater than half a width of the entire first side surface in the magnetization direction, and wherein the second supporting portion abuts and thereby supports a fourth corner portion-side end portion of the second side surface of the permanent magnet in the reference direction of the permanent magnet, the fourth corner portion-side end portion of the second side surface having a width in the magnetization direction of the permanent magnet which is not greater than half a width of the entire second side surface in the magnetization direction.