The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 28, 2009
Filed:
Nov. 29, 2006
Tomotsugu Sugiyama, Kyoto, JP;
Shinji Takemoto, Kyoto, JP;
Tsuyoshi Yasumura, Kyoto, JP;
Nidec Corporation, Kyoto, JP;
Abstract
A motor includes a heat dissipating structure. The motor may be used for a fan and includes on an upper surface of a circuit board a heat dissipating layer. The heat dissipating layer has a high thermal conductivity. The fan also includes a coil provided on the teeth of a stator core. The heat dissipating layer and the coil axially face each other, and thermal conductive members are arranged therebetween. An outer dimension of the circuit board is greater than that of an impeller cup so that a radially outward portion of the circuit board protrudes radially outwardly from the impeller cup. The heat generated by the coil is transferred to the heat dissipating layer via the thermal conductive members. Therefore, the heat is dissipated from a wide area, which efficiently dissipates heat from the fan. In addition, since the circuit board and the heat dissipating layer protrude radially into an air-flow generated by an impeller, the heat transferred to the heat dissipating layer is actively dissipated.