Rotating electric machine with resin covering electrical conductor sections and having skin and core layers
Electrical conductor sections, which are mounted to a base member, have respective field-system-side peripheral surfaces thereof covered with a resin. The resin covering the field-system-side peripheral surfaces of the electrical conductor sections has two skin layers formed respectively on the surface side and the electrical-conductor-section side in the resin and a core layer formed between the two skin layers. The sum of radial thicknesses of the two skin layers is greater than a radial thickness of the core layer on a radial cross section of an armature. Alternatively, the entire resin covering the field-system-side peripheral surfaces of the electrical conductor sections is formed of a skin layer.
1. A rotating electric machine comprising:
a field system including a magnet section having a plurality of magnetic poles whose polarities alternate in a circumferential direction; and
an armature including a multi-phase armature coil and a base member to which the armature coil is mounted,
wherein
either of the field system and the armature is configured as a rotor,
the armature coil has electrical conductor sections arranged at positions facing the field system and in alignment with each other in the circumferential direction,
the electrical conductor sections, which are mounted to the base member, have respective field-system-side peripheral surfaces thereof covered with a resin,
the resin covering the field-system-side peripheral surfaces of the electrical conductor sections has two resin skin layers formed respectively on a surface side and an electrical-conductor-section side, and a resin core layer formed between the two resin skin layers, and
a sum of radial thicknesses of the two resin skin layers is greater than a radial thickness of the resin core layer on a radial cross section of the armature.
2. The rotating electric machine as set forth in claim 1 , wherein
the armature coil has coil ends located axially outside the electrical conductor sections,
the coil ends are covered, in a state of being bent to a base member side so as to abut an axial end face of the base member that is cylindrical in shape, with a second resin,
the second resin covering the coil ends has two resin skin layers formed respectively on a surface side and a coil-end side, and a resin core layer formed between the two resin skin layers, and
a sum of axial thicknesses of the two resin skin layers is greater than an axial thickness of the resin core layer on an axial cross section of the armature.
3. The rotating electric machine as set forth in claim 1 , wherein
between each circumferentially-adjacent pair of the electrical conductor sections, there is provided a resin, and
the resin provided between each circumferentially-adjacent pair of the electrical conductor sections has two resin skin layers formed respectively on two circumferential sides, and a resin core layer formed between the two resin skin layers, and
a sum of circumferential widths of the two resin skin layers is greater than a circumferential width of the resin core layer on the radial cross section of the armature.
4. The rotating electric machine as set forth in claim 1 , further comprising a cylindrical portion to which the base member is fixed,
wherein
in the cylindrical portion, there is formed a coolant passage through which a coolant flows, and
the resin extends through gaps formed in the armature coil to abut the base member.
5. The rotating electric machine as set forth in claim 1 , wherein
the resin is formed of a liquid crystal polymer having anisotropy, and
the resin is oriented from the surface of the resin toward the base member.
6. The rotating electric machine as set forth in claim 1 , wherein
the resin has a filler added to a base material thereof, and
cross-sectional dimensions of the resin skin layers are set to have the respective thicknesses larger than or equal to a grain size of the filler and smaller than or equal to twice the grain size.
7. The rotating electric machine according to claim 1 , wherein the armature has a slotless structure such that no slots are formed in the base member.