Rotor for electric motor and brushless motor
AssigneeMitsuba Corporation
InventorsYuichi SHIONO, Masanori SATO, Hisashi ISHIDA, Tohru YUMOTO
Life of this patent
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Abstract
In the present invention a rotor core is formed by multiple divided cores that are separated from one another, and side core plates that link the outer circumferential ends of the divided cores in the circumferential direction. Slits into which magnets are inserted are maintained between the divided cores. The rotor core and a rotary shaft are coupled to one another by a molded resin, and the molded resin covers protrusions which are on both sides in the circumferential direction at the inner circumferential end of each divided core.
Claims20
A rotor for electric motor, comprising:
- a rotary shaft;
- a non-magnetic body, formed to cover an outer circumferential surface of the rotary shaft;
- a rotor core, linked to the outer circumference of the rotary shaft through the non-magnetic body, and a plurality of slits that extend in an axial direction and a radial direction of the rotary shaft being formed side by side along a circumferential direction of the rotary shaft;
- and
- a plurality of magnets, provided in the plurality of the slits,
- wherein the rotor core is formed in a manner that there is a space between an inner circumferential surface side of the rotor core and the outer circumferential surface of the rotary shaft, and
- protrusions are provided on an inner circumferential side of the rotor core to suppress the rotor core from being separated from the non-magnetic body outward in the radial direction, and grooves are provided on the non-magnetic body to receive the protrusions and engage with the protrusions.
A brushless motor, comprising:
- a rotor for electric motor;
- a motor case, rotatably supporting the rotor;
- and
- a stator, fixed inside the motor case and wound by a winding wire supplied with a current,
- the rotor further comprising:
- a rotary shaft;
- a non-magnetic body, formed to cover an outer circumferential surface of the rotary shaft;
- a rotor core, linked to the outer circumference of the rotary shaft through the non-magnetic body, and a plurality of slits that extend in an axial direction and a radial direction of the rotary shaft being formed side by side along a circumferential direction of the rotary shaft;
- and
- a plurality of magnets, provided in the plurality of the slits,
- wherein the rotor core is formed in a manner that there is a space between an inner circumferential surface side of the rotor core and the outer circumferential surface of the rotary shaft, and
- protrusions are provided on an inner circumferential side of the rotor core to suppress the rotor core from being separated from the non-magnetic body outward in the radial direction, and grooves are provided on the non-magnetic body to receive the protrusions and engage with the protrusions.
Dependencies are inferred from the claim text.