Cage brushless doubly-fed AC motor with heterogeneous rotor

Abstract

The invention discloses a cage-shaped brushless double-fed alternating-current motor with a heterogeneous rotor structure. The cage-shaped brushless double-fed alternating-current motor is characterized in that a rotor comprises heterogeneous end covers, a rotor iron core and a rotary shaft, wherein all punching pieces of the rotor iron core are provided with a plurality of groove holes, and copper strips are embedded into the groove holes in an insulated manner. In the same quadrant, from the symmetrical axis to the outer edge, the groove holes are distributed in a mode of in-sequence and symmetric increase of the diameter. The heterogeneous end covers are formed by embedding of conductive parts and insulating parts, the positions and the shapes of the two end parts of the conductive parts correspond to the groove holes, and the end parts with the equal diameter in the same quadrant are connected in sequence by a two-two manner. The cage-shaped brushless double-fed alternating-current motor disclosed by the invention has the beneficial effects that the form of combining the heterogeneous end covers and the copper strips of the rotor is adopted, the structure is compact, the connecting strength is enhanced, the problem of looseness and throwing out of connecting guide lines at the end parts of the short-circuit cage-shaped rotor when in high-speed rotation is solved, so that the reliability of the motor is improved; and since the embedded copper strips with different sectional surfaces are adopted, the basic equalization of the currents among different short-circuit windings is ensured, so that the electromagnetic torque provided by all guiding strips is more uniform, and the electromechanical energy conversion efficiency is higher.

Description

Technical field [0001] The invention relates to an AC motor, in particular to a cage type brushless double-fed AC motor with heterogeneous rotors. Background technique [0002] In the existing brushless double-fed AC motor, two sets of windings with different pole pairs are embedded on the stator core, which are power winding and control winding. The rotor mainly includes wound rotor, cage rotor, reluctance rotor or composite rotor. structure. Among these rotor structures, cage rotors have been increasingly widely used due to their simple structure. At this stage, the cage rotor structure mainly includes a short-circuit cage rotor and a conventional cage rotor with copper bars. Although the two structures are similar, the process requirements are quite different. Conventional rotors with copper bars do not need to be insulated by slots, and can be all welded together with end rings at the ends of the rotor, while short-circuit cage rotors must be insulated with slots and have g...

AI Technical Summary

Problems solved by technology

At this stage, the cage rotor structures mainly include short-circuit cage rotors and conventional cage rotors with copper bars. Although the structures of the two are similar, the process requirements are quite different.

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