VALVE-TYPE MOTOR Russian patent published in 1997 - IPC

FIELD: valve-type high-speed electric drives. SUBSTANCE: motor has disk rotor with trapezoidal-shaped permanent magnets closed by magnetic circuit and stator placed in motor frame coaxially to rotor and built up of trapezoidal-shaped stator coils with radially arranged active portions of conductors, rotor position sensors placed on magnetic circuit side; shape and geometry of permanent magnets and stator coils are chosen so as to ensure trapezoidal-form dependence between motor output torque and angle of rotor turn; trapezoidal-shaped permanent magnets have concave section on one or both bases; mean length of trapezium is perpendicular to disk radius and makes up 0.7-0.9 of pole pitch; width of active portions of conductors makes up 0.2-0.4 of pole pitch; angle between radii crossing center of active portions of conductors in each coil is 360/n, where n is number of magnets; rotor is built up of three disks; stator has two windings each placed between external and internal disks; cooling ports are provided in top and bottom parts of motor frame and on its side surface. EFFECT: improved motor efficiency, specific power output, cooling conditions, reliability; simplified design. 12 dwg