JPS5976136A - Supporting device for stator coil - Google Patents

Abstract

PURPOSE:To alleviate the concentration of pressure on the contacting surface of a wavy spring with a box-shaped insulator by providing a groove having a curvature larger than that of the spring at a load point on the insulator having a wedge. CONSTITUTION:A nonmagnetic wavy spring 6 having a high resistance is provided under a wedge 7, the spring 6 is contained in a plurality of box-shaped insulators 5 divided in the laminating direction of a stator core 1 to suppress the electromagnetic vibration of a stator coil 2. A groove 5b is formed corresponding to the top of a continuous waveform spring 6 on the insulator 5, and a recess along the deflecting line of the spring is formed from the box portion 5b in the deep groove. A groove 7a is formed on the wedge 7 in coincidence with the deflecting line of the spring 6. In this manner, the contacting part of the spring with the insulator can be prevented from being worn due to vibration, and stable spring pressure can be transmitted to the stator coil.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to supporting a spring for holding a wire ring, and in particular, to support a spring for pressing a wire wheel, and in particular, to maintain the spring action and apply pressure to the wire wheel correctly after driving a wedge. The present invention relates to a stator coil support structure that supports the stator coil and reduces pressure drop due to spring action during machine operation.

[Prior art]

As shown in Figure 1, there is a non-magnetic metal splash 6 under the wedge 7.
In the case of suppressing electromagnetic vibration of the stator coil 2,
This spring 6 is housed in a multi-tube box-shaped insulator 5 divided in the stacking direction of the stator core 1, and placed under the wedge 7. In order to directly block the spring 6 with this spring pressure, the wire ring is placed in the slot. It is effective to fix it without any gaps.

In addition, conventionally, a semiconductive spring was inserted between the conductor and the slot wall to press the conductor against the other wall, increasing the frictional force between the conductor and the wall, suppressing conductor vibration caused by electromagnetic force, and This has prevented electrical discharge caused by contact with and separation from the material, as well as insulation damage caused by this. In this method, high elastic materials such as metal materials cannot be used, so the strain energy per volume is small, the spring mounting space becomes narrow, and the slot size increases. The present invention has a structure in which conductor vibration is suppressed by a spring pressure set thicker than electromagnetic force, and a non-magnetic metal spring with a high elastic coefficient such as 5U8304-OF is installed under the wedge.

Under the influence of a magnetic field, the metal spring generates an induced power, so its contact with the slot wall is made of iron, and the metal spring is enclosed in a box-shaped insulator to insulate it from the slot. Further, since this box-shaped insulator contains a hard metal spring that generates heat, it is desirable to use a material with good thermal conductivity and excellent wear resistance.

[Object of the Invention] The object of the present invention is to alleviate pressure concentration at the contact surface between the wave spring arranged in the slot or under the wedge and the wedge or box-shaped insulation, and to reduce wear of the wedge or box-shaped insulation at the contact surface. An object of the present invention is to provide an entire stator coil support device that prevents dimensional changes and maintains a stable spring pressure over a long period of time without causing deformation of a wave spring.

[Summary of the Invention J Various devices are known for preventing vibrations from occurring in the stator coil due to the interaction of currents flowing through the stator coil within the slot. In the present invention, a spring formed into a waveform in advance is installed between the wedge and the stator coil, and pressure is applied to the conductor of the stator coil to prevent vibration from occurring. By increasing the assembly precision of the wedge and the box-shaped insulation, it maintains the stability of the spring pressure, and improves the adhesion between the spring and the contact insulator while the electric machine is operating. To prevent wear and tear. Waveform springs tend to cause pressure concentration at the peaks of the waveforms. An insulating material such as a glass laminate, which is softer than the metal on the opposite side, is subjected to excessive pressure, and if imaging is applied in this situation, this part will wear out significantly. This partial depression is expanded by a dimensional change in the insulation at the load point, weakening the load on the wave spring in close contact with it.

For this reason, the stability of the amount of deflection of the wave spring is disrupted, and as a result, the spring pressure is retreated, reducing the vibration suppressing force of the stator coil. Therefore, not only spring pressure but also dimensional changes in wedges and box-shaped insulation must be carefully monitored. In particular, small dimensional changes at the load point of the wave spring will cause significant pressure fluctuations. Therefore, by increasing the close contact between the load point of the wave spring and the insulating inclusion, the width of pressure fluctuation can be reduced.

At such loading points, it is effective to provide a groove in the wedge or box type insulation with a curvature larger than that of the wave spring.

[Embodiments of the invention]

In the present invention, grooves 5b as shown in FIG. 2 are formed in the box-shaped insulation corresponding to the apexes of the continuous wave spring, and recesses along the line of deflection of the wave spring are provided in the deep grooves of the phase portion 5a.

Such materials are hard P such as epoxy glass laminates.
R and P are preferable.

Further, as shown in FIG. 1, it is more effective to provide the groove 7a of the wedge 7 in accordance with the deflection line of the wave spring.

〔Effect of the invention〕

According to the present invention, since the contact surface between the spring and the insulator can be expanded, the contact pressure can be reduced, vibration wear of the contact part can be reduced, and good adhesion can be maintained without dimensional change of the insulator. . Moreover, stable spring pressure can be transmitted to the stator coil.

Since the joints of the wave spring fit into the grooves of the box-shaped insulation, movement of the wave spring within the box-shaped insulation, wear, and noise can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the inside of a slot showing the stator coil supporting device of the present invention, and FIG. 2 is a perspective view of a box-shaped insulation.

Claims (1)

[Claims] 1. In a stator wire support device that includes a non-magnetic, high-resistance wave spring under the wedge, and the wave spring is isolated from the slot and housed in a box-shaped insulator, at least one of the wedge or the box-shaped insulator is A stator wire support device characterized in that a groove having a curvature of a wave of the wave spring is provided on a surface in contact with a node serving as a load point of one of the wave springs.