Back to results
US 11,456,632 B2Granted
Consequent-pole type rotor, electric motor, air conditioner, and method for manufacturing consequent-pole type rotor
AssigneeMitsubishi Electric Corporation
InventorsTakaya Shimokawa, Koji Yabe
Life of this patent
Estimating the term…
Abstract
A rotor includes a rotor core, a permanent magnet, a first part, a second part, and a third part. The third part is formed integrally with the first part and the second part. The rotor core is longer than the permanent magnet in an axial direction.
Claims19
A consequent-pole type rotor used for an electric motor including a stator, comprising:
- a rotor core including a first end part and a second end part in an axial direction, and five magnet insertion holes;
- five permanent magnets disposed in the five permanent magnet insertion holes, respectively;
- a first part formed inside the rotor core in a radial direction;
- a second part that is adjacent to the respective permanent magnets in the respective magnet insertion holes;
- and
- a third part formed on the first end part, the third part being formed integrally with the first part and the second part;
- and
- a shaft formed inside the first part in the radial direction,
- wherein
- the shaft is fixed to the first part,
- the rotor core is longer than the five permanent magnets in the axial direction,
- a length of the first part in the radial direction is three times or more as large as a length of an air gap formed between the stator and the rotor core,
- a length of the rotor core in the radial direction is at maximum in a portion where each of the five permanent magnets is disposed and a portion constituting a pseudo- magnetic pole, and
- a length of the rotor core in the radial direction is at minimum in an inter-pole part.
11 more elements
An electric motor comprising:
- a stator;
- and
- a consequent-pole type rotor,
- wherein the consequent-pole type rotor includes
- a rotor core including a first end part and a second end part in an axial direction, and five magnet insertion holes,
- five permanent magnets disposed in the five permanent magnet insertion holes, respectively;
- a first part formed inside the rotor core in a radial direction,
- a second part that is adjacent to the respective permanent magnets in the respective magnet insertion holes, and
- a third part formed on the first end part, the third part being formed integrally with the first part and the second part, and
- a shaft formed inside the first part in the radial direction,
- wherein
- the shaft is fixed to the first part,
- the rotor core is longer than the five permanent magnets in the axial direction,
- a length of the first part in the radial direction is three times or more as large as a length of an air gap formed between the stator and the rotor core,
- a length of the rotor core in the radial direction is at maximum in a portion where each of the five permanent magnets is disposed and a portion constituting a pseudo- magnetic pole, and
- a length of the rotor core in the radial direction is at minimum in an inter-pole part.
13 more elements
An air conditioner comprising:
- an indoor unit;
- and
- an outdoor unit connected to the indoor unit,
- wherein at least one of the indoor unit and the outdoor unit includes an electric motor,
- wherein the electric motor includes
- a stator;
- and
- a consequent-pole type rotor,
- wherein the consequent-pole type rotor includes
- a rotor core including a first end part and a second end part in an axial direction, and five magnet insertion holes,
- five permanent magnets disposed in the five permanent magnet insertion holes, respectively;
- a first part formed inside the rotor core in a radial direction,
- a second part that is adjacent to the respective permanent magnets in the respective magnet insertion holes, and
- a third part formed on the first end part, the third part being formed integrally with the first part and the second part, and
- a shaft formed inside the first part in the radial direction,
- wherein
- the shaft is fixed to the first part,
- the rotor core is longer than the five permanent magnets in the axial direction,
- a length of the first part in the radial direction is three times or more as large as a length of an air gap formed between the stator and the rotor core,
- a length of the rotor core in the radial direction is at maximum in a portion where each of the five permanent magnets is disposed and a portion constituting a pseudo-magnetic pole, and
- a length of the rotor core in the radial direction is at minimum in an inter-pole part.
18 more elements
A method for manufacturing a consequent-pole type rotor including a rotor core including five magnet insertion holes, five permanent magnets inserted in the five magnet insertion holes, respectively, a shaft, a first resin part formed inside the rotor core, a second resin part that is adjacent to the respective permanent magnets in the respective magnet insertion holes, and a third resin part formed on an end part of the rotor core in an axial direction of the rotor core, the consequent-pole type rotor being used for an electric motor including a statoi;
- the method comprising the steps of:
- preparing the rotor core by stacking a plurality of electromagnetic steel sheets in which the five magnet insertion holes and a through hole are formed;
- inserting the five permanent magnets into the five magnet insertion holes, respectively;
- inserting the shaft into the through hole;
- and
- forming the first resin part, the second resin part, and the third resin part integrally by pouring a resin toward an end of the rotor core in the axial direction,
- wherein
- the first resin part is formed so that a length of the first resin part in the radial direction is three times or more as large as a length of an air gap formed between the stator and the rotor core,
- a length of the rotor core in the radial direction is at maximum in a portion where each of the five permanent magnets is disposed and a portion constituting a pseudo-magnetic pole,
- a length of the rotor core in the radial direction is at minimum in an inter-pole part, and
- the shaft is fixed to the first resin part.
8 more elements
Dependencies are inferred from the claim text.