2-PHASE HYBRID TYPE STEPPING MOTOR

摘要

PROBLEM TO BE SOLVED: To analyze the theory of vernier system which has not yet been investigated whether the pitch of the small teeth of stator should be set identical or not identical to that of the rotor in view of reducing a cogging torque of a 2-phase hybrid type stepping motor and moreover to obtain the vernier system assuring a higher degree of freedom. SOLUTION: In this 2-phase hybrid type stepping motor, the small teeth provided at the end portion of stator magnetic pole is disassembled to a desired set of two or three small teeth and the small teeth are arranged so that a sum of the fourth order and third order harmonic vectors of permeance becomes zero under the reason that a cause of generation of cogging torque lies in that permeance between small teeth respectively provided to the stator magnetic pole and rotor magnetic pole changes depending on rotation of the rotor conforming to a certain regularity.