| 摘要 |
FIELD: electricity.SUBSTANCE: stator is a salient-pole stator but its salient poles do not have windings and a tooth area. The three-phase winding of the stator, which generates a system of phase magnetomotive forces (mmf), is lumped in form of coils and is placed on radial protrusions (poles) of a frontal core placed on one of the ends of the stator perpendicular to the axis of the asynchronous motor with a central opening for the shaft. The poles of the frontal core with windings are magnetically closed with the stator poles by steel rod bundles. The novelty in the design of the stator is that elements of its magnetic conductor along with the rotor core form a symmetrical multi-phase magnetic circuit connected by a Y connection with two node "points": in the frontal core of the stator and in the rotor. Under the action of the symmetrical system of mmf, a phase magnetic flux system which is symmetrical in space and time (on phase) arises in phases of such a symmetrical magnetic circuit. Summation thereof gives rise to a circular revolving magnetic field of the stator, and node "points" of the magnetic circuit have zero magnetic potential, owing to which the phase magnetic flux of the stator crosses the air gap only once in the forward direction: stator pole - air gap - rotor core, and have only the normal (radial) component of the magnetic induction vector. Return flux and tangential components of the induction vector are absent in the back of the rotor.EFFECT: improved electrical and magnetic properties of the stator of an asynchronous motor, and improved energy characteristics as a result, simple technique of making the stator and reduced material consumption.6 dwg |
