Three-phase permanent magnet cascade claw type stepping motor
AssigneeJapan Servo Co., Ltd.
InventorMasafumi Sakamoto
Life of this patent
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Abstract
A magnet type stepping motor which has (1) a stator with three-phase stator windings, and 6 m pieces of stator main pole arranged side by side, where m is an integer and ≧1, the stator windings of one phase are wound around every two stator main poles among the 6 m pieces of the stator main pole, wherein when the stator windings of one phase are excited with a direct current, m pieces of N pole and M pieces of S pole are formed alternately on the 6 m pieces of stator main pole, and (2) a rotor of a cylindrical permanent magnet magnetized in the circumferential direction to form Z/2 pieces of N pole and Z/2 pieces of S pole alternately, where Z is the number of rotor poles.
Claims2
A three-phase permanent magnet cascade claw type stepping motor comprising
- (1) a rotor consisting of a cylindrical magnet magnetized in a circumferential direction thereof so as to form M pieces of N pole and M pieces of S pole respectively, where M is an integer and is ≧2, and
- (2) a stator having annular three stator units spread in an axial direction of the rotor concentrically with a rotor axis, each of said stator units consisting of (a) two opposite stator cores having claw poles extending axially on the inner peripheral surface thereof, and b) a respective one of three stator windings of U, V and W phases held between said two stator cores, said windings of U, V and W phases being arranged sequentially in an axial direction of said stator, the claw poles of each stator winding being separated from one another by 180°/M and are magnetized in opposite polarities, said three stator windings being connected to form a star or delta connection so that adjacent claw poles magnetized by the stator windings of U phase and V phase are deviated by 60°/M from each other in a circumferential direction of the stator and are magnetized in opposite polarities the same polarity, and so that adjacent claw poles magnetized by the stator windings of V phase and W phase are deviated by 60°/M from each other in the circumferential direction of said stator and are magnetized in opposite polarities the same polarity.
Dependencies are inferred from the claim text.