Rotating assembly construction for high speed induction motor

A dynamoelectric machine comprising:

• a rotor having a rotor core including a plurality of laminations, wherein at least one of the plurality of laminations has a solid central portion that is coincident with an axis of rotation of the rotor;
• and
• a first rotor end plate and a first end of a rotor shaft integrally formed as a single unit and a second rotor end plate and a second end of a rotor shaft integrally formed as a single unit, the first rotor end plate coupled to a first end of the rotor core and the second rotor end plate coupled to a second end of the rotor core, the first and second rotor end plates being coupled to respective ends of the rotor core by connecting members passing through holes in the laminations, the connecting members being uniformly distributed at a distance from the axis of rotation, the rotor core including a squirrel cage with rotor bars in slots in the laminations and two integrally formed end rings at respective ends of the rotor bars, the end rings substantially surrounding the respective end plates, each of the end plates including a lip contacting the respective end ring and restraining motion of the respective end ring due to centrifugal forces, the rotor shaft rotating about an axis of rotation of the rotor.

An induction motor, comprising:

• a rotor having a core and an axis of rotation, the core including a plurality of laminations;
• and
• a first rotor end plate and a first end of a rotor shaft integrally formed as a single unit and a second rotor end plate and a second end of a rotor shaft integrally formed as a single unit, the first rotor end plate coupled to a first end of the rotor core and the second rotor end plate coupled to a second end of the rotor core, the first and second rotor end plates being coupled to respective ends of the rotor core by connecting members passing through holes in the laminations, the connecting members being uniformly distributed at a distance from the axis of rotation, the rotor core including a squirrel cage with rotor bars in slots in the laminations and two integrally formed end rings at respective ends of the rotor bars, the end rings substantially surrounding the respective end plates, each of the end plates including a lip contacting the respective end ring and restraining motion of the respective end ring due to centrifugal forces, the rotor shaft rotating about an axis of rotation of the rotor.

A method of fabricating a dynamoelectric machine including the steps of:

• using lamination sheets as at least part of a core of a rotor, at least one of the lamination sheets having a solid central portion;
• and
• using a first end plate and a first end of a shaft formed as a single unit and a second end plate and a second end of a shaft formed as a single unit to couple the shaft to the rotor, the rotor core including a squirrel cage with rotor bars in slots in the laminations and two integrally formed end rings at respective ends of the rotor bars, the end rings substantially surrounding the respective end plates, and the end plates including a lip contacting the respective end ring and restraining motion of the respective end ring due to centrifugal forces.