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. 13, 1999
Filed:
Mar. 31, 1997
Chi-Mou Zhao, Taipei Hsien, TW;
Chin-Po Liao, Yun Lin Hsien, TW;
Shyh-Jier Wang, Hsinchu Hsien, TW;
Min-Der Wu, Tai Chung, TW;
Der-Ray Huang, Hsinchu, TW;
Tai-Fa Ying, Hsinchu Hsien, TW;
Eric-G Lean, Hsinchu, TW;
Han Chung Wang, Hsinchu, TW;
Alex Hong, Kaohsiung, TW;
Chiang Cheng Huang, Taipei, TW;
Yin-Rong Hong, Kaohsiung, TW;
Abstract
A spindle motor for a disc drive, such as a CD-ROM drive, is provided. This spindle motor is a brushless motor of a single-phase axial-winding and radial-gap type including a stator, a rotor coupled to said stator, and a driving circuit for supplying a driving signal to the stator to rotate the rotor. The stator includes a pair of upper and bottom salient-pole pieces formed with a plurality of tooth-like portions serving as salient-poles. The peak surface of each tooth-like portion is formed into a symmetrical convex shape, which minimizes the cogging torque of the motor. Further, the use of a phase-adjuster in the driving circuit allows the motor to produce large output torque at high speeds. The output characteristics of this spindle motor meet the requirements of high speed CD-ROM drives.