The device for fastening the winding in the slots of the core of an electric machine

 

The invention relates to the field of electrical and electric engineering, in particular to the construction of large electric machines, mainly turbogenerators and hydrogenerators, and more particularly to the fastening elements of the winding in the slots of the core. An object of the invention is to improve the reliability of mounting of the winding in the slots of the core of the electric machine by changing the structure of the device for fastening the winding. The solution of this problem is due to the fact that the device for fastening the winding in the slots of the core of the electric machine is made in the form of an elastic wavy strip, and the protrusions and depressions wavy surface angled relative to the longitudinal axis of the strip. The angle is selected depending on the width of the strip so that the projection enters the plane of one of the tabs on the opposite edge of the strip found on the incident plane of the adjacent ledge. 3 Il.

The invention relates to the field of electrical engineering, in particular to the construction of large electric machines, mainly turbogenerators and hydrogenerators, and more particularly to the fastening elements of the second wavy strip, placed between the coil and wedge into the longitudinal groove of the wedge. In the wavy wavy strip is perpendicular to the longitudinal axis of the strip. Ongoing during operation of the electric machine load in the radial direction leads to reduced elasticity of the strip and having a longitudinal groove in the wedge reduces its cross-section, which reduces its rigidity. The result is a loosening of the winding in the slot and generally reduces the reliability of the device.

Closest to the claimed invention is a device for fastening the terminals of the winding in the slot of the core of the electric machine [2], made in the form of an elastic wavy strip, made of fiberglass and is placed between the terminals and the iron core.

Improving the reliability of the device mounting the winding in this invention is achieved by applying to one side of a corrugated strip of nylon fabric, resistant to abrasion. This solution complicates the manufacturing technology of the strip. At the same time there is a risk of delamination layer nylon fabric during operation of the device, which may lead to an emergency situation and SN-resistant and which provides high mechanical strength, during operation of the electric machine is loss of elasticity of the strip due to the effect of loads acting on the terminals of the winding in the tangential direction, which reduces the reliability of the device.

The present invention is to improve the reliability of mounting of the winding in the slots of the core of the electric machine by changing the structure of the device for fastening the winding.

The solution of this problem is due to the fact that the device for fastening the winding in the slots of the core of the electric machine is made in the form of an elastic wavy strip, and the protrusions and depressions wavy surface angled relative to the longitudinal axis of the strip. The angle is selected depending on the width of the strip so that the projection enters the plane of one of the tabs on the opposite edge of the strip found on the incident plane of the adjacent ledge.

The location of the projections and depressions undulating surface at a specified angle to the longitudinal axis of the strip allows you to increase the length of the wave and to increase the rigidity of the strip along its edges, which increases the mechanical strength and elasticity of the strip.

Improving mechanical prochnosti core, because it eliminates the loosening of:

- in the tangential direction when the gasket is installed between the terminals of the winding and the groove wall of the core;

in the radial direction, if the gasket is installed between the coil and the slot wedge.

New in the invention is the implementation of the protrusions and depressions wavy strip at an angle relative to the longitudinal axis of the strip, in which the projection enters the plane of one of the tabs on the opposite edge of the strip is on the incident plane of the adjacent ledge.

This set of new characteristics of the proposed device is not detected from the prior art, which allows to make a conclusion on compliance of the claimed invention, the condition of patentability "inventive step".

The invention is illustrated by drawings, where Fig.1 shows the elastic strip wave form (top view), and Fig.2 is a view of the elastic strip in a perspective view; Fig.3 is a cross-section of the groove of the electric machine with the laid winding and installed wavy strips.

Elastic strip 1 has a wavy surface, in which the adjacent protrusions 2 and 3 and the trench 4 angledfrom the edge of the strip is on the incident plane of the adjacent ledge 3.

Elastic wave-like strip 1 as a device for fastening the winding is placed between the wall of the groove of the core 6 and the terminals of the winding 7 and 8, respectively, in the direction of rotation of the rotor and is designed to provide lateral tangential thrust.

Elastic wave-like strip 1 is also located between the slot wedge 9 and the winding rod 7 and is intended to provide radial expansion.

Implementation of the proposed solutions to technical difficulties does not represent that allows to make a conclusion on compliance of the claimed invention, the condition of patentability "industrial applicability".

Sources of information

1. Patent Of Great Britain No. 1340756.

2. USSR author's certificate No. 495743.

Claims

The device for fastening the winding in the slots of the core of an electric machine, made in the form of an elastic wavy strip with projections and depressions, wherein the protrusions and depressions are made at an angle relative to the longitudinal axis of the strip, in which the projection enters the plane of one of the tabs on the opposite edge of the strip is on the incident plane of the adjacent ledge.

 

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