Rotor of brushless motor
First Claim
1. A rotor of a brushless motor, comprising:
- a shaft elongated in a rotational axis;
a magnet layer comprising two or more magnetic rings arranged along the rotational axis and surrounding a portion of the shaft, the two or more magnetic rings in combination providing a plurality of permanent magnet poles in the magnet layer;
a vibration absorption portion interposed between the shaft and the magnet layer; and
a molded, non-ferromagnetic single piece member interposed between the vibration absorption portion and the two or more magnetic rings, wherein each of the two or more magnetic rings contacts and is engaged with the single piece member, wherein the molded, non-ferromagnetic single piece member is substantially less elastic and substantially less thermally expansive than the vibration absorption portion.
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Accused Products
Abstract
Some embodiments of the present disclosure provide a rotor of an electric brushless motor configured to be light weight and prevent vibrations generated during an operation of the motor to be transferred to the shaft of the rotor. The rotor includes a shaft elongated in a rotational axis, a single body magnet comprising alternately magnetized portions, and a vibration absorption portion interposed between the shaft and single body magnet. The vibration absorption portion absorbs vibrations generated during the operation of the motor and can include an elastic or a non-elastic material. The rotor further includes a non-elastic portion inhibiting the expansion of the vibration absorption portion when the vibration portion is elastic.
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Citations
25 Claims
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1. A rotor of a brushless motor, comprising:
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a shaft elongated in a rotational axis; a magnet layer comprising two or more magnetic rings arranged along the rotational axis and surrounding a portion of the shaft, the two or more magnetic rings in combination providing a plurality of permanent magnet poles in the magnet layer; a vibration absorption portion interposed between the shaft and the magnet layer; and a molded, non-ferromagnetic single piece member interposed between the vibration absorption portion and the two or more magnetic rings, wherein each of the two or more magnetic rings contacts and is engaged with the single piece member, wherein the molded, non-ferromagnetic single piece member is substantially less elastic and substantially less thermally expansive than the vibration absorption portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification