Apparatus for manufacturing rotor

A method of manufacturing a rotor having a permanent magnet provided in a state of being embedded in a magnet accommodation hole of a rotor core, the permanent magnet having a folding shape being convex towards a radially inside part, the permanent magnet in the embedded state being magnetized from outside the rotor using a magnetization apparatus, wherein the magnetization apparatus is provided with, as a yoke part, a first yoke disposed in a radially outside of the rotor, a second yoke disposed in an axially outside of the rotor, magnetically coupled with the first yoke and having an insertion protrusion inserted into a shaft insertion hole of the rotor, and a magnetization coil provided on magnetic paths of the first yoke and the second yoke,

• the method comprising steps of:
• an installation step of inserting an insertion portion of the second yoke into the shaft insertion hole of the rotor, disposing the rotor such that a radially inside part and a radially outside part of the rotor oppose the first yoke and the second yoke in a radial direction, and magnetically connecting the first yoke, the second yoke, and the rotor;
• and
• a magnetization step of causing magnetization flux to flow inside the rotor based on energization of the magnetization coil to magnetize the permanent magnet in the embedded state.

A rotor manufactured by a method of manufacturing a rotor having a permanent magnet provided in a state of being embedded in a magnet accommodation hole of a rotor core, the permanent magnet having a folding shape being convex towards a radially inside part, the permanent magnet in the embedded state being magnetized from outside the rotor using a magnetization apparatus, the magnetization apparatus being provided with, as a yoke part, a first yoke disposed in a radially outside of the rotor, a second yoke disposed in an axially outside of the rotor, magnetically coupled with the first yoke and having an insertion protrusion inserted into a shaft insertion hole of the rotor, and a magnetization coil provided on magnetic paths of the first yoke and the second yoke,

• the method comprising steps of:
• an installation step of inserting an insertion portion of the second yoke into the shaft insertion hole of the rotor, disposing the rotor such that a radially inside part and a radially outside part of the rotor oppose the first yoke and the second yoke in a radial direction, and magnetically connecting the first yoke, the second yoke, and the rotor;
• and
• a magnetization step of causing magnetization flux to flow inside the rotor based on energization of the magnetization coil to magnetize the permanent magnet in the embedded state,
• wherein the rotor comprises:
• a rotor core and a permanent magnet provided in a state of being embedded in a magnet accommodation hole of the rotor core, the permanent magnet having a folding shape being convex towards a radially inside part and being magnetized from outside the rotor using the magnetization apparatus, wherein
• a magnet pole pitch is defined as a distance on an outer peripheral surface of the rotor core between extending lines extending from inner side surfaces of respective straight parts of the permanent magnet, and an embedded depth is defined as a distance on a center line in a circumferential direction of the permanent magnet from the outer peripheral surface of the rotor core to an inner side surface of a bending portion of the permanent magnet, and
• the permanent magnet has a deep folding shape in which the embedded depth is larger than the magnet pole pitch.