Motor rotor with inner sleeve
OwnerShun Nakayama, Yuji Sasaki +3inventors
InventorsShun Nakayama, Yuji Sasaki, Yoshihito Katsu, Koji Sakota, Yoshikazu Mineda
Life of this patent
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Abstract
A rotor includes a shaft, a magnet located around the shaft, an inner sleeve located around the shaft and between the shaft and the magnet, and an end ring located around the inner sleeve and positioned adjacent to the magnet. The inner sleeve includes a holding portion having an inner diameter that surrounds and holds the shaft, and a gap forming portion including a first inner diameter that is larger than the inner diameter of the holding portion, such that the gap forming portion is spaced apart from the shaft. A part of the magnet is located on the holding portion. The end ring is located on the gap forming portion.
Claims20
A motor rotor comprising:
- an inner sleeve including a holding portion configured to hold a shaft having a rotation axis and a gap portion configured not to contact an outer peripheral surface of the shaft;
- a magnet having a cylindrical shape provided with a magnet through hole into which the inner sleeve is inserted;
- and
- an end ring including an end ring through hole in which the inner sleeve is placed and an end ring end surface that faces an end surface of the magnet, the inner sleeve press-fitted into the end ring through hole,
- wherein a part of the magnet is located on an outer peripheral surface of the holding portion,
- wherein the holding portion and the gap portion are individually provided with through hole portions communicating with each other, the through hole portions configured to receive the shaft,
- wherein an inner diameter of the through hole portion provided in the gap portion is larger than an inner diameter of the through hole portion provided in the holding portion, and
- wherein the end ring is located on the gap portion.
A motor rotor comprising:
- a shaft;
- a magnet located around the shaft;
- an inner sleeve located around the shaft and between the shaft and the magnet;
- and
- an end ring located around the inner sleeve and positioned adjacent to the magnet,
- wherein the inner sleeve includes:
- a holding portion having an inner diameter that surrounds and holds the shaft;
- and
- a gap forming portion including a first inner diameter that is larger than the inner diameter of the holding portion, such that the gap forming portion is spaced apart from the shaft,
- wherein a part of the magnet is located on the holding portion, and
- wherein the end ring is located on the gap forming portion.
A motor rotor production method comprising:
- preparing an inner sleeve including a holding portion configured to hold a shaft having a rotation axis and a gap portion configured not to contact an outer peripheral surface of the shaft;
- placing, on the holding portion of the inner sleeve, a magnet having a cylindrical shape provided with a magnet through hole in which the inner sleeve is located;
- and
- press-fitting, onto the inner sleeve, an end ring including an end ring through hole in which the inner sleeve is placed and an end ring end surface that faces an end surface of the magnet, such that the end ring is located on the gap portion of the inner sleeve.
Dependencies are inferred from the claim text.