United States Patent [19] [ii] Patent Number: 4,972,109
Kakizaki et al. [45] Date of Patent: Nov. 20,1990
[54] STEPPING MOTOR
[75] Inventors: Masaaki Kakizaki, Kawasaki; Akira Torisawa, Tokyo; Noriaki Ito, Yokohama, all of Japan
[73] Assignee: Canon Kabushiki Kaisha, Tokyo,
Japan
[21] Appl. No.: 281,393
[22] Filed: Dec. 8,1988
[30] Foreign Application Priority Data
Dec. 15, 1987 [JP] Japan 62-190841[U]
[51] Int. CI.5 H02K 37/00
[52] U.S. a 310/49 A; 310/49 R
[58] Field of Search 310/42, 49 A, 49 R,
310/112, 254, 257
[56] References Cited
U.S. PATENT DOCUMENTS
4,330,724 5/1982 Goddijn 310/49
4,672,247 6/1987 Madsen et al 310/49
4,794,292 12/1988 Torisawa 310/257
FOREIGN PATENT DOCUMENTS
3321254 12/1984 Fed. Rep. of Germany .
59-53079 3/1984 Japan .
1067334 5/1967 United Kingdom .
2030789 8/1979 United Kingdom .
2095917 10/1982 United Kingdom .
2192313 1/1988 United Kingdom .
Primary Examiner—William H. Beha, Jr.
Assistant Examiner—Judson H. Jones
Attorney, Agent, or Firm—Fitzpatrick, Cella, Harper &
Scinto
[57] ABSTRACT
A stepping motor comprising a rotor having magnetic poles on the peripheral surface thereof at a predetermined pitch, first and second stator yoke units each having pole teeth at the predetermined pitch and disposed with deviation of J pitch therebetween relative to the rotor, and a coil for exciting the first and second stator yoke units, characterized by means for adjusting the phase deviation between the first and second stator yoke units.
2 Claims, 18 Drawing Sheets
