公开(公告)号：JPS63224654A

公开(公告)日：1988-09-19

申请号：JP5596887

申请日：1987-03-11

Applicant: SONY CORP

Inventor： SAOTOME TOSHIO ,  NOGUCHI YOSHIYUKI ,  NISHIKAWA MITSUO ,  YAMAZAKI SHIGEKI

IPC: H02K21/00 ,  G11B19/20 ,  H02K7/08 ,  H02K7/09 ,  H02K21/24

Abstract: PURPOSE:To prevent shaft blurring caused by the rattle of shaft in the radial direction, by imbalancedly setting the magnet field between a stator and a rotor so that the shaft of rotor will be pressed to one direction in the radial direction of bearing of the stator. CONSTITUTION:In a brushless motor 1, a stepped section 10a to a part of a stator yoke 10 of a stator 3 is formed in projecting on the side of sheet coil 14. In rotating a rotor 2, imbalance is caused to magnetic attractive force of a rotor magnet 8 against the stator yoke 10, and the rotor magnet 8 will always be pulled to rotate to the stepped section 10a of the stator yoke 10, so that the whole of a shaft 5 for rotor 2 is pressed to one direction in the radial direction of a bearing 11 of the stator 3 and rotates under the so-called laterally pressed condition.

公开(公告)号：JPS61247262A

公开(公告)日：1986-11-04

申请号：JP8929285

申请日：1985-04-25

Applicant: SONY CORP

Inventor： SAKAMOTO SATOSHI ,  SAOTOME TOSHIO ,  INOUE RYOKATSU ,  WATANABE TOSHIYUKI

IPC: H02K29/08

Abstract: PURPOSE:To eliminate disturbance due to leakage flux, by putting together the main magnetic poles of a rotor magnet and a detecting magnetized section, and by evening the magnetic flux quantities in N, S. CONSTITUTION:Inside the main magnetic poles 8 of eight poles, the detecting magnetized section 9 of a pair of equal areas in N, S is formed. The magnetized section 9 consists of the right half S pole 9a and the left half N pole 9b. The areas of the N, S poles of a magnet 3 including the main magnetic poles 8 are equal to each other as a whole, and leakage flux due to the unequal areas is reduced.