Patent ID: 7965009

Claim:
A motor rotor comprising: a rotary shaft having a magnet mounting portion; a permanent magnet layer formed of a plurality of permanent magnets disposed on a surface of the magnet mounting portion; a thread layer formed by winding a thread of a reinforced fiber material around the permanent magnet layer, the thread layer being impregnated with a curable resin; first and second annular members provided on the rotary shaft and respectively disposed on both ends of the magnet mounting portion in an axial direction of the rotary shaft; a cylindrical member fixed to the first and second annular members to cover a surface of the thread layer from a radially outer side of the rotary shaft with a gap formed between an outer peripheral surface of the thread layer and an inner peripheral surface of the cylindrical member; and a resin layer formed of a curable resin which has been injected into the gap and cured; wherein the first annular member is fitted in one opening portion of the cylindrical member located on one end in the axial direction, and is formed with one or more resin injection passages for injecting the curable resin into the gap between the thread layer and the cylindrical member, and the second annular member tightly seals the other opening portion of the cylindrical member located on the other end in the axial direction; wherein the second annular member is disposed adjacent to an end of the magnet mounting portion on the other end in the axial direction; and the motor rotor further comprises: an annular partition wall member concentrically disposed on the rotary shaft between the first and second annular members, the partition wall member being disposed adjacent to an end of the magnet mounting portion on the one end in the axial direction so as to form an annular passage having a bottom portion located between the first annular member and the partition wall member, the partition wall member being formed, in its outer periphery, with one or more thread passing recesses that allow a continuous thread, which is continuous with the thread forming the thread layer, to pass through and also allow the curable resin injected from the resin injection passage to pass through; a subsequent thread layer is formed of the continuous thread that has passed through the thread passing recesses, and has been led into the annular passage and wound around the bottom portion under high tension with a gap formed between an outer peripheral surface of the subsequent thread layer and the inner peripheral surface of the cylindrical member, the subsequent thread layer being impregnated with a curable resin; and a resin layer extension is formed of the curable resin which has been injected into the gap from the resin injection passages and cured.