M-PHASE STEP ELECTRIC MOTOR Russian patent published in 1998 - IPC

FIELD: automatic control systems, slow-speed driving induction electric motors. SUBSTANCE: device has rotor with Z_r teeth and stator which has phase regions are shifted by 1/m of rotor pole pitch and are designed as adjacent tooth poles which are embraced by phase coils which are connected in series opposing. Number of rotor teeth conforms to condition Z_r= 2•m•k(Z_p+Z_p.f)±k+n,, where k is number of repeated members in phase region; it is equal to arbitrary positive or negative integer; Z_p is number of teeth comprising pole, Z_p.f is number of fictional teeth at each pole; it is integer starting from zero; n is number of slots between adjacent poles of repeated stator members (or between adjacent poles of adjacent phase regions), further characterized by increased angle between centers of adjacent teeth of these pairs of poles; this increment is λ = 360^°/Z_r, it is in range of 0 to mk-1. Angle between centers of adjacent teeth of poles of repeated members (except slots which angle is increased by λ) is equal to α = (Z_p.f+1)•τ. Angle between centers of adjacent teeth of poles of adjacent slot regions (except slots which angle is increased by τ) is equal to β = (Z_p.f+1±1/m)•τ. Sign before 1/m is same as sign in above-mentioned equation for number of rotor teeth. EFFECT: possibility to design electric motor with arbitrary step. 3 cl, 1 dwg