Method for increasing the operating efficiency of asynchronous short-circuited electric machines, and an asynchronous short-circuited electric machine

Abstract

The essence of the proposed invention is that the action of a rotating electromagnetic field of a stator on the short-circuited turns of a rotor winding extending through areas adjacent to the pole pitch limits of the stator is supplemented by the additional action of a rotating electromagnetic field of the stator on sections of the short-circuited turns of the rotor winding extending through areas adjacent to the limits of a half pole pitch of the stator. The present method and the machine variants based thereon make it possible to provide a machine in which the engine starting current ratio is lower by comparison with machines of the prior art because of the prevention of losses on the braking effect, which makes it possible to increase the starting frequency without load reduction and to use the machine in the most severe operating conditions with an increased load on the shaft, wherein the machine maintains the rotating field effect and can still be fully operational upon the disconnection of one phase, generating in the phase-disconnected winding a high-quality harmonic voltage for the missing phase.

Description

technical field [0001] The invention belongs to the field of power generation and can be used in electromechanical energy conversion systems, especially non-synchronous short-circuit motors. Background technique [0002] A German patent discloses an asynchronous engine (51083, C1.H02K17 / 16, 1889), which includes a stator and a rotor. The rotor has a squirrel-cage coil set, and the coil set has a plurality of conductor bars. Each conductor rod is installed symmetrically in the slots around the surface of the rotor, and the ends of the conductor rods are short-circuited by end rings. The principle of operation of the asynchronous engine is based on the mutual magnetic coupling between the primary rotating electromagnetic field of the stator and the secondary induced electromagnetic field generated in the rotor. [0003] The shortcomings of the motor design are low engineering characteristics, low power generation capacity, low operation and technical-economic performance, su...

AI Technical Summary

Problems solved by technology

[0006] The disadvantage of this method is that the torque will only increase at certain positions of the rotor relative to the stator, which will cause a change in torque to the rotation of the rotor, and cannot increase the starting torque moderately

The unevenness of this torque will cause knocking, noise and vibration when the motor is running, so this technology is limited to flywheel motor installations and will cause excessive wear

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