Spindle motor for optical disc drives

• Main Authors: HONG; YIN-RONG, WU; MIN-DER, HUANG; DER-RAY, YING; TAI-FA, LIAO; CHIN-PO, WANG; SHYH-JIER, HONG; ALEX, HUANG; CHIANG CHENG, LEAN; ERIC-G, ZHAO; CHI-MOU, WANG; HAN CHUNG
• Format: Patent
• Language: English
• Published: 13.07.1999
• Edition: 6
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; GENERATION; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

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.