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Rotor of brushless motor

  • US 8,299,661 B2
  • Filed: 08/14/2008
  • Issued: 10/30/2012
  • Est. Priority Date: 05/11/2007
  • Status: Expired due to Fees
First Claim
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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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