SINGLE-PHASE ELECTRIC MOTOR Russian patent published in 1995 - IPC

FIELD: electrical engineering. SUBSTANCE: lumped coils of main and auxiliary phases of stator winding are put on two systems of salient laminated poles 1-5. Poles of different systems are displaced by half pole pitch and alternate over circumference. Poles 1,3 and 5 belong to one phase and poles 2 and 4 - to other one. Laminations of poles of stator have shape of scalene trapezium. Height of pole changes in axial direction. Radial size of poles of each system changes in axial direction from outer diameter of yoke to which given pole is adjoined to inner diameter of another yoke. Part 7 of yoke borders on odd poles 1-5 of one phase, part 6 of yoke abuts on even poles 2 and 4 of the other phase. Parts of yoke are wound from electrical-sheet steel. Through radial slots dividing each pole into two halves and each yoke - into four sections are made along axes of poles and yokes bordering on them. On side of rotor adjacent halves of two poles placed close are joined with pole pieces 8-11 also having radial slots which are continuations of slots along axes of poles. Each pole piece is common for two adjacent poles. Pole arc of each pole is formed from two pole pieces. For instance, pole pieces 8 and 9 belong to pole 2, and pole pieces 9 and 10 - to pole 3. EFFECT: reduced usage of active materials by improved employment of magnetic systems, saving of electrical-sheet steel. 2 dwg