IIIH
US006600244B2
(12) United States Patent ao) Patent No.: us 6,600,244 B2
Okazaki et al. (45) Date of Patent: Jul. 29,2003
(54) ELECTRIC MOTOR
(76) Inventors: Masafumi Okazaki, c/o Mitsubishi Denki Kabushiki Kaisha 2-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo 100-8310 (JP); Yasuhide Yagyu, c/o Mitsubishi Denki Kabushiki Kaisha 2-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo 100-8310 (JP); Hideki Megata, c/o Mitsubishi Denki Kabushiki Kaisha 2-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo 100-8310 (JP); Takeshi Sugiyama, c/o Mitsubishi Denki Kabushiki Kaisha 2-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo 100-8310 (JP); Yuji Nakahara, c/o Mitsubishi Denki Kabushiki Kaisha 2-3, Marunouchi 2-chome, Chiyoda-ku,Tokyo 100-8310 (JP); Akira Hashimoto, c/o Mitsubishi Denki Kabushiki Kaisha 2-3, Marunouchi 2-chome, Chiyoda-ku, Tokyo 100-8310 (JP)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 09/873,354
(22) Filed: Jun. 5, 2001
(65) Prior Publication Data
US 2002/0067094 Al Jun. 6, 2002 (30) Foreign Application Priority Data
Dec. 5, 2000 (JP) 2000-370563
(51) Int. CI.7 H02K 11/00
(52) U.S. CI 310/71; 310/71
(58) Field of Search 310/71, 179, 260,
310/67 R, 254; H02K 11/00
(56) References Cited
U.S. PATENT DOCUMENTS
5,196,752 A * 3/1993 Palma 310/184
5,828,147 A * 10/1998 Best et al 310/71
5,900,687 A * 5/1999 Kondo et al 310/260
FOREIGN PATENT DOCUMENTS
JP 6-233483 * 8/1994
JP 11-18345 1/1999
JP 2000-224801 * 8/2000
OTHER PUBLICATIONS
Merriam Webster's Collegiate Dictionary, tenth edition, 1993, p. 105.*
* cited by examiner
Primary Examiner—Nestor Ramirez
Assistant Examiner—Dane Dinh Le
(57) ABSTRACT
A small-sized and inexpensive electric motor in which connection of a stator coil is easy, the connecting portion occupies a small space, and stable torque characteristics are obtained by making electric resistance uniform. A coil bobbin is mounted on a magnetic pole of a stator core, and a stator coil is fitted. A lead wire is led to an external diameter side of one end of the stator core. A connecting conductor holder with a common coil-connecting conductor, connecting conductors for each phase and a through hole is mounted on an end of a coil bobbin. The common coilconnecting conductor has connecting terminals projecting in radial directions, and the connecting conductors for each phase have such a cross-sectional area as to equalize electric resistance of each phase after connecting the stator coil. The through hole is formed to allow a bearing-housing portion to be inserted.
8 Claims, 7 Drawing Sheets
