Rotor and permanent magnet electric motor
AssigneeFujitsu General Limited
InventorTomooki Hasegawa
Life of this patent
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Abstract
A rotor, which is cylindrically formed of a magnetic body and in which a plurality of magnet embedding holes are annularly formed at predetermined intervals in a circumferential direction, plate-like permanent magnets being embedded in the magnet embedding holes, includes a flux barrier that is disposed toward an outer circumference of the rotor from an circumferential end of each of the magnet embedding holes, and a slit that is disposed to be adjacent to the flux barrier, in which the slit is a long hole extending in a direction of becoming distant from the flux barrier, from an inner circumferential side of the rotor toward an outer circumferential side thereof, and a notch portion is provided on the outer circumference of the rotor opposing the flux barrier in a diameter direction of the rotor.
Claims8
A rotor which is cylindrically formed of a magnetic body and in which a plurality of magnet embedding holes are annularly formed at predetermined intervals in a circumferential direction, plate-like permanent magnets being embedded in the magnet embedding holes, the rotor comprising:
- a first nonmagnetic portion that is disposed toward an outer circumference of the rotor from an circumferential end of each of the magnet embedding holes;
- and
- a second nonmagnetic portion that is disposed to be adjacent to the first nonmagnetic portion,
- wherein the second nonmagnetic portion is a slotted hole extending in a from an inner circumferential side of the rotor toward an outer circumferential side thereof, and
- wherein a notch portion is provided on the outer circumference of the rotor opposing the first nonmagnetic portion in a diameter direction of the rotor, and
- wherein, in a case where a gap between the first nonmagnetic portion and the notch portion is indicated by t, and a gap between the second nonmagnetic portion and the outer circumference of the rotor is indicated by T, the following expression is satisfied:
- 1.5t≤T≤2.5t.
Dependencies are inferred from the claim text.