Long-stator winding grounding sleeve

Abstract

The invention relates to the technical field of long-stator linear motors, in particular to a long-stator winding grounding sleeve which comprises a sleeve body and a connecting element arranged at one end of the sleeve body and used for being connected with a grounding line, an opening which is axially through and for a winding cable to be pressed in is formed in the peripheral surface of the sleeve body, the sleeve body is arranged in a groove of a long stator and coats the peripheral surface of more than half of the winding cable, multiple inwards-protruding portions which protrude inwardsand are in elastic contact with the winding cable are arranged on the inner surface of the sleeve body, and multiple outwards-protruding portions which protrude inwards and are in elastic contact withgrooves are arranged on the outer surface of the sleeve body. The sleeve body and the winding cable can be ensured to maintain great close contact and to have large contact area, gap change between the surface of the winding cable and the sleeve body can be eliminated to greatest extent to enable current on the surface of the winding cable to stably flow to the sleeve body, and rapid change of current density and electric field potential caused by rapid gap change is avoided.

Description

technical field [0001] The invention relates to the technical field of long stator linear motors, in particular to a long stator winding grounding sleeve. Background technique [0002] The long stator linear motor is the main bearing and driving part of the rail system of the high-speed maglev train. A long stator is installed along the rail of the high-speed maglev train, and a three-phase AC winding is installed in the groove of the long stator. The winding cable is It is composed of copper or aluminum as conductor, rubber as insulating layer and outer sheath material. Due to the fast-changing high-voltage and large current carried by the cable during normal operation, the surface of the cable induces an induction effect, causing an induced potential difference on the surface of the cable along the longitudinal axis, that is, there is a potential difference in the surface layer of the long stator winding cable in the longitudinal direction, thus forming a current along the...

AI Technical Summary

Problems solved by technology

[0004] However, this connection device has the problem of unstable contact between the sleeve and the long stator winding cable: on the one hand, when the long stator winding cable is embedded in the long stator groove, the cable outside the groove is in a bent state, resulting in The pressure between the outer surface of the cable and the contact surface of the sleeve is uneven. With the vibration of the road surface, the contact surface between the cable surface and the sleeve will change; on the other hand, when the ambient temperature changes or the current changes, thermal expansion and contraction occur , the change of the contact surface between the outer surface of the cable and the sleeve will directly cause the change of the electric field in the gap. When the gap between the outer surface of the cable and the sleeve changes instantaneously, the sharp change of the electric field potential will easily cause air breakdown, and finally cause the surface of the cable to Although the connection device has adopted a fixed contact to ensure the flow of current, this structure does not take into account the difference between the geometry of the long stator groove and the shape of the sleeve, which will easily cause the loosening of the sleeve, resulting in the outer surface of the cable being in contact with the sleeve. Breakdown occurs due to changes in the gap of the sleeve

Images