Bipolar stepping motor rotor and method of manufacture

Details Bipolar stepping motor rotor and method of manufacture Bipolar stepping motor rotor and method of manufacture

H - Electricity

02

K

26/113, 310/58

H02K 37/16 (2006.01) G04C 3/14 (2006.01) G04C 13/11 (2006.01) H02K 1/27 (2006.01) H02K 7/116 (2006.01)

Patent

CA 1274268

BIPOLAR STEPPING MOTOR ROTOR WITH DRIVE PINION AND METHOD OF MANUFACTURE ABSTRACT OF THE DISCLOSURE A wristwatch movement has a Lavet stepping motor directly driving a toothed center wheel by means of a drive pinion which is an integral part of the stepping motor rotor. The rotor comprises a bipolar permanent magnet member and a plastic rotor body molded around the central part of the magnet member to surround it. The rotor body defines a pair of driving pins oriented at a preselected angle with respect to the axis of magnetization. The rotor body also includes journals supporting it for rotation within the stator opening of the stepping motor.

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