ROTOR, ELECTRIC MOTOR, COMPRESSOR, AIR CONDITIONER, AND METHOD FOR MANUFACTURING ROTOR

• Main Author: WATANABE, Takanori
• Format: Patent
• Language: English; French; German
• Published: 15.09.2021
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION

A rotor includes a rotor core having magnet insertion holes in a number corresponding to a pole number in a circumferential direction about an axis, and a center hole at a center portion of the rotor core in a radial direction about the axis, and a shaft inserted in the center hole. The rotor core has a plurality of first slits and a plurality of ribs alternately arranged in the circumferential direction along a periphery of the center hole, and a plurality of second slits on an outer side with respect to the plurality of first slits in the radial direction. The plurality of first slits are equal in number to half or an integer multiple of the pole number, and the plurality of second slits are equal in number to half or an integer multiple of the pole number. Each of the plurality of second slits is formed to cover a corresponding rib of the plurality of ribs from an outer side in the radial direction. Each of the plurality of first slits has a length A1 in the circumferential direction and a width A2 in the radial direction. Each of the plurality of second slits has a length B1 in the circumferential direction. A1 > A2 and A1 > B1 are satisfied.