Motor, rotor, compressor, and refrigeration and air conditioning apparatus

A rotor comprising:

• a rotor core having a magnet insertion hole, and
• a plurality of permanent magnets disposed in the magnet insertion hole of the rotor core and having two permanent magnets adjacent to each other,
• wherein the rotor core has a first magnet holding portion disposed between the two permanent magnets adjacent to each other in the magnet insertion hole, and a second magnet holding portion disposed at an end of the magnet insertion hole in a circumferential direction of the rotor core;
• wherein the rotor core has a plurality of electromagnetic steel sheets stacked in an axial direction, and
• wherein relationships A>B and A>C are satisfied, where a number of the plurality of electromagnetic steel sheets of the rotor core is represented by A, and among the plurality of electromagnetic steel sheets of the rotor core, a number of electromagnetic steel sheets having the first magnet holding portions is represented by B, and a number of electromagnetic steel sheets having the second magnet holding portions is represented by C.

A compressor comprising a motor and a compression mechanism driven by the motor,

• the motor comprising a stator and a rotor provided inside the stator,
• the rotor comprising:
• a rotor core having a magnet insertion hole, and
• a plurality of permanent magnets disposed in the magnet insertion hole of the rotor core and having two permanent magnets adjacent to each other,
• wherein the rotor core has a first magnet holding portion disposed between the two permanent magnets adjacent to each other in the magnet insertion hole, and a second magnet holding portion disposed at an end of the magnet insertion hole in a circumferential direction of the rotor core;
• wherein the rotor core has a plurality of electromagnetic steel sheets stacked in an axial direction, and
• wherein relationships A>B and A>C are satisfied, where a number of the plurality of electromagnetic steel sheets of the rotor core is represented by A, and among the plurality of electromagnetic steel sheets of the rotor core, a number of electromagnetic steel sheets having the first magnet holding portions is represented by B, and a number of electromagnetic steel sheets having the second magnet holding portions is represented by C.

A refrigeration and air conditioning apparatus comprising a compressor, a condenser, a decompression device and an evaporator,

• the compressor comprising a motor and a compression mechanism driven by the motor,
• the motor comprising a stator and a rotor provided inside the stator,
• the rotor comprising:
• a rotor core having a magnet insertion hole, and
• a plurality of permanent magnets disposed in the magnet insertion hole of the rotor core and having two permanent magnets adjacent to each other,
• wherein the rotor core has a first magnet holding portion disposed between the two permanent magnets adjacent to each other in the magnet insertion hole, and a second magnet holding portion disposed at an end of the magnet insertion hole in a circumferential direction of the rotor core;
• wherein the rotor core has a plurality of electromagnetic steel sheets stacked in an axial direction, and
• wherein relationships A>B and A>C are satisfied, where a number of the plurality of electromagnetic steel sheets of the rotor core is represented by A, and among the plurality of electromagnetic steel sheets of the rotor core, a number of electromagnetic steel sheets having the first magnet holding portions is represented by B, and a number of electromagnetic steel sheets having the second magnet holding portions is represented by C.