JP2018082558A - Insulation treatment device for stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulation treatment device for a stator which can stably attach resin material to a joint portion of a segment coil of a stator when stators are continuously produced.SOLUTION: In an insulation treatment device 100 for a stator 1 having a resin tank 20 in which resin material R is stored, a joint portion 14 of a segment coil 10 of the stator 1 is immersed in the resin material R, and insulation processing is performed to the joint portion 14 by attaching the resin material R to the joint portion 14. The insulation treatment device further has vibration means 30 vibrating the resin tank 20 with a predetermined vibration frequency in order to flow the resin material R, and natural frequency detecting means 40 detecting a natural frequency of the resin tank 20. A predetermined vibration frequency is changed according to a change of the natural frequency of the resin tank 20 detected by the natural frequency detecting means 40.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an insulation processing apparatus for a stator.

  2. Description of the Related Art A technique is known in which an insulating process is performed on a joint portion of a stator segment coil constituting an electric motor or the like. For example, Patent Literature 1 discloses a stator insulation processing apparatus for performing insulation treatment on a joint of a segment coil of a stator, in a resin tank containing a powdery resin material, and inside the resin material. And an air supply means for sending air. In the stator insulation processing device described in Patent Document 1, air is fed into the resin material by the air supply means, and the joint portion is immersed in the resin material of the resin tank in a state where the resin material is suspended. The resin material can be stably attached to the joint.

JP 2001-086683 A

  As a method for stably adhering a resin material to the joint portion of the stator segment coil in the stator insulation processing apparatus, as in Patent Document 1, air is sent inside the resin material to float the resin material, Research has been made to cause a resin material to flow by vibrating a resin tank at a certain vibration frequency. However, when the stator is continuously produced, the flow of the resin material becomes unstable even if the resin tank is vibrated while being kept constant at the optimum vibration frequency determined at the beginning of production. In some cases, the resin material cannot be stably adhered to the joint.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and in the case of continuously producing a stator, a stator insulation treatment that can more stably adhere a resin material to a joint portion of a segment coil of the stator. An object is to provide an apparatus.

  The present invention includes a resin tank in which a resin material is accommodated, and a joint portion of a segment coil of a stator is immersed in the resin material, and the resin material is attached to the joint portion to insulate the joint portion. A stator insulation processing apparatus, comprising: vibration means for vibrating the resin tank at a predetermined vibration frequency to flow the resin material; and natural frequency detection means for detecting the natural frequency of the resin tank. In addition, the predetermined vibration frequency is changed in accordance with a change in the natural frequency of the resin tank detected by the natural frequency detecting means.

  According to the present invention, when the stator is continuously produced, the resin material can be more stably attached to the joint portion of the segment coil of the stator.

It is a perspective view which shows schematic structure of the stator in which the insulation process is performed by the insulation processing apparatus concerning this Embodiment. It is a schematic diagram which shows schematic structure of the insulation processing apparatus concerning this Embodiment. It is a graph which shows an example of the measurement result by the acceleration pick-up contained in a natural frequency detection means when shaking the vibration frequency given to a resin tank. It is a graph which shows an example of the measurement result by the acceleration pick-up contained in a natural frequency detection means when the quantity of the resin material R accommodated in the resin tank is changed.

Embodiments of the present invention will be described below with reference to the drawings.
First, with reference to FIG. 1, the structure of the stator 1 which is insulated by the insulation processing apparatus concerning this Embodiment is demonstrated.
FIG. 1 is a perspective view showing a schematic configuration of the stator 1. As shown in FIG. 1, a stator 1 that is a stator of a rotating electrical machine includes a stator core 11 and a segment coil 10 composed of a plurality of segments 12. The stator core 11 is formed by laminating substantially cylindrical electromagnetic steel plates in the axial direction of the stator 1 (Z-axis direction in FIG. 1), and the teeth 11a projecting toward the inner peripheral side and the radial direction of the stator core 11 between adjacent teeth 11a. The formed slot 11b is provided. Each slot 11b accommodates a segment 12 formed in a substantially U shape (or a substantially V shape).

  Two different segments 12 are joined at a wire end joint 14. A plurality of joints 14 are arranged in four rows in the circumferential direction of the stator core 11 at the coil end 13 of the segment coil 10. The joint 14 is joined by welding. The stator 1 is turned upside down after the joining portion 14 is joined by welding, and the joining portion 14 of the segment coil 10 is disposed on the resin tank in a posture extending downward from the stator core 11. Insulating treatment is applied to the joint 14.

  Next, the configuration of the insulation processing apparatus 100 according to the present embodiment will be described with reference to FIG. FIG. 2 is a schematic diagram showing a schematic configuration of the insulation processing apparatus 100 according to the present embodiment. As shown in FIG. 2, the insulation processing apparatus 100 includes a resin tank 20, a vibration unit 30, a natural frequency detection unit 40, a lifting device 50, and a control unit 70.

  The resin tank 20 accommodates the powdery resin material R. The resin material R is floated by sending dry air into the powdery resin material R through the air supply port 60 provided on the side surface of the resin tank 20 and the porous plate disposed inside the resin tank 20. Let the state be In addition, in this embodiment, although it was set as the structure which accommodates the powder-form resin material R in the resin tank 20, it is not limited to this. For example, it is good also as a structure which accommodates the liquid resin material R in the resin tank 20. FIG.

  The lifting device 50 has the stator 1 disposed on the resin tank 20 in a posture in which the joint portion 14 of the segment coil 10 extends downward from the stator core 11 toward the resin material R accommodated in the resin tank 20. Lower. Thereby, it is made to immerse in the resin material R in the resin tank 20 from the junction part 14 of the segment coil 10 to the joint base vicinity. In order to ensure reliable insulation of the stator 1, the entire stator 1 may be immersed in the resin material R in the resin tank 20.

  The vibration means 30 is a vibrator that vibrates the resin tank 20 at a predetermined vibration frequency in order to cause the resin material R to flow. The natural frequency detection means 40 detects the natural frequency of the resin tank 20. The natural frequency detection means 40 includes, for example, an acceleration pickup and an analysis device.

  The control means 70 changes the vibration frequency at which the resin tank 20 is vibrated by the vibration means 30 in accordance with the change in the natural frequency of the resin tank 20 detected by the natural frequency detection means 40.

Next, a method for detecting the natural frequency of the resin tank 20 containing the resin material R by the natural frequency detecting means 40 will be described. In the following description, reference is also made to FIG. 2 as appropriate.
FIG. 3 is a graph showing an example of a measurement result obtained by the acceleration pickup included in the natural frequency detection means 40 when the vibration frequency applied to the resin tank 20 is swung. Here, the horizontal axis represents the frequency (Hz) given to the resin tank 20 by the vibration means 30, and the vertical axis represents the axial acceleration (m / s ^ 2) of the resin tank 20. As shown in FIG. 3, in the region A surrounded by the broken line, the axial acceleration has a peak. The vibration frequency applied to the resin tank 20 by the vibration means 30 corresponding to this axial acceleration peak is the natural frequency of the resin tank 20 containing the resin material R. As described above, the horizontal axis indicates the natural frequency of the resin tank 20 containing the resin material R by measuring the acceleration in the axial direction when the vibration frequency applied to the resin tank 20 by the vibration means 30 is swung. Can be detected.

  If the vibration frequency given to the resin tank 20 is a region A surrounded by a broken line, the axial acceleration becomes too large due to resonance (in the example shown in FIG. 3, the axial acceleration is 20 m / s ^ 2 or more). The flow state of the resin material R becomes unstable, for example, the surface of the resin material R undulates, and the resin material R cannot be stably adhered to the joint portion 14 of the segment coil 10. If the vibration frequency applied to the resin tank 20 is a region C surrounded by a broken line, the axial acceleration is too small (in the example shown in FIG. 3, the axial acceleration is 5 m / s ^ 2 or less). Cannot sufficiently flow, and the resin material R cannot be stably adhered to the joint portion 14 of the segment coil 10. When the vibration frequency given to the resin tank 20 is a region B surrounded by a broken line, the magnitude of the axial acceleration can stably attach the resin material R to the joint portion 14 of the segment coil 10 (see FIG. 3). In the example shown, the axial acceleration is about 5 m / s ^ 2 to 15 m / s ^ 2.

  As described above, in order to stably attach the resin material R to the joint portion 14 of the segment coil 10 based on the natural frequency of the resin tank 20 containing the resin material R detected by the natural frequency detection means 40. The optimum vibration frequency of the resin tank 20 can be determined.

  By the way, it has been found that the natural frequency not only changes depending on the shape of the vibration target but also changes depending on the weight of the vibration target. When the amount of the resin material R accommodated in the resin tank 20 changes, the weight of the resin tank 20 changes, so that the natural frequency of the resin tank 20 also changes.

  FIG. 4 is a graph showing an example of a measurement result by the acceleration pickup included in the natural frequency detection means 40 when the amount of the resin material R accommodated in the resin tank 20 is changed. As in FIG. 3, the horizontal axis represents the frequency (Hz) applied to the resin tank 20 by the vibration means 30, and the vertical axis represents the axial acceleration (m / s ^ 2) of the resin tank 20. A broken line L2 is a measurement result by an acceleration pickup when the amount of the resin material R is increased with respect to the solid line L1, and a one-dot chain line L3 is a result of the acceleration pickup when the amount of the resin material R is decreased with respect to the solid line L1. The measurement results are shown. As shown in FIG. 4, the natural frequency of the resin tank 20 is small in the broken line L2 with respect to the solid line L1, and the natural frequency of the resin tank 20 is large in the alternate long and short dash line L3. That is, when the amount of the resin material R increases, the natural frequency of the resin tank 20 decreases, and when the amount of the resin material R decreases, the natural frequency of the resin tank 20 increases.

  Thus, the natural frequency of the resin tank 20 changes when the amount of the stored resin material R changes. When the stator 1 is continuously produced, the resin material R is replenished to the resin tank 20 when the amount of the resin material R in the resin tank 20 gradually decreases and the amount of the resin material R decreases below the lower limit value. . For this reason, when the stator 1 is continuously produced, the resin material R accommodated in the resin tank 20 is maintained even if the resin tank 20 is vibrated while being kept constant at the optimal vibration frequency determined at the beginning of production. If the amount is changed, the resin material R may not be stably adhered to the joint portion 14 of the segment coil 10. Accordingly, when the stator 1 is continuously produced, the quality of the stator 1 varies greatly.

  In the present embodiment, for example, each time the stator 1 is insulated, the natural frequency of the resin tank 20 is detected, and the vibration frequency of the resin tank 20 is changed according to the change in the natural frequency of the resin tank 20. To change. By doing so, even when the amount of the resin material R in the resin tank 20 changes as in the case where the stator 1 is continuously produced, the resin material becomes more stable at the joint portion of the stator segment coil. Can be attached. Thereby, when producing the stator 1 continuously, the dispersion | variation in the quality of the stator 1 can be suppressed.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. In the above embodiment, each time the stator 1 is insulated, the natural frequency of the resin tank 20 is detected and the vibration frequency of the resin tank 20 is changed based on the detected natural frequency. However, it is not limited to this. For example, the natural frequency of the resin tank 20 may be detected every predetermined period, and the vibration frequency of the resin tank 20 may be changed according to the change of the natural frequency of the resin tank 20.

DESCRIPTION OF SYMBOLS 1 Stator 10 Segment coil 11 Stator core 11a Teeth 11b Slot 12 Segment 13 Coil end part 14 Joining part 20 Resin tank 30 Vibration means 40 Natural frequency detection means 50 Lifting apparatus 60 Air supply port 70 Control means 100 Insulation processing apparatus R Resin material

Claims (1)

Insulating treatment of a stator including a resin tank in which a resin material is accommodated, in which a joint portion of a segment coil of the stator is immersed in the resin material, and the resin material is attached to the joint portion to insulate the joint portion A device,
Vibration means for vibrating the resin tank at a predetermined vibration frequency in order to flow the resin material;
A natural frequency detecting means for detecting the natural frequency of the resin tank, and
An insulation processing apparatus for a stator that changes the predetermined vibration frequency in accordance with a change in the natural frequency of the resin tank detected by the natural frequency detection means.

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