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CN-121986268-A - Wire defect inspection device, wire defect inspection system, and wire defect inspection method

CN121986268ACN 121986268 ACN121986268 ACN 121986268ACN-121986268-A

Abstract

A defect inspection device for a wire, wherein the wire is wound on a wound member (22) and travels with a constant tension, is provided with an ion generation means (4) which is disposed along a travel path of the wire (1) reaching the wound member (22) and generates ions surrounding the outer periphery of the wire (1), a current detection means (31) which detects a current flowing in the wire as a result of the invasion of charges of the ions from a defective portion of the wire, and a defect presence/absence determination means (33) which determines whether the wire (1) is defective or not based on a result of comparing the output of the current detection means (31) with a predetermined defect presence/absence threshold value, and can detect a defect of the wire (1) during travel and prevent the insulation layer of the wire (1) from being damaged during detection.

Inventors

  • XIONG MINGQIAN
  • Mitaka Kazuhiro
  • Saruwatari Hideyuki
  • History of Sakamoto

Assignees

  • 三菱电机株式会社

Dates

Publication Date
20260505
Application Date
20240717
Priority Date
20231005

Claims (12)

  1. 1. A defect inspection apparatus for a wire which travels under a constant tension so as to be wound around a wound member, wherein, The defect inspection device for winding wire comprises: An ion generating unit that is disposed along a travel path of the winding wire reaching the wound member and generates ions surrounding an outer periphery of the winding wire; a current detection unit for detecting a current flowing in the wire as a result of the invasion of the charge of the ion from the defective portion of the wire, and And a defect presence/absence judging unit configured to judge whether or not the winding is defective based on a result of comparing an output of the current detecting unit with a predetermined defect presence/absence threshold.
  2. 2. The defect inspection apparatus for a wire according to claim 1, wherein, The defect presence threshold is a value larger than the noise voltage.
  3. 3. The defect inspection apparatus for a wire according to claim 1, wherein, The ion generating unit has a discharge needle, an ion generator that causes corona discharge at the discharge needle, and a power supply that applies a voltage to the ion generator.
  4. 4. The defect inspection apparatus for a wire according to claim 3, wherein, The voltage applied to the ion generator is set so that the minimum value of the voltage determined to be defective by the defect presence/absence determination means is a value larger than the defect presence/absence threshold.
  5. 5. The defect inspection apparatus for a wire according to claim 3 or 4, wherein, The defect inspection device for the wire is provided with a shielding box so as to surround the discharge needle and the wire surrounded by the ions.
  6. 6. The defect inspection apparatus for a wire according to claim 5, wherein, The shield can is formed of a non-conductive material.
  7. 7. The defect inspection apparatus for a wire according to any one of claims 3 to 6, wherein, The defect inspection device for a wire has a metal plate that collects the ions between the discharge needle and the wire, a brush that contacts the wire, and a conductor that causes electric charges of the ions collected in the metal plate to flow to the brush.
  8. 8. The defect inspection apparatus for a wire according to any one of claims 3 to 7, wherein, The defect inspection apparatus for a wire is configured to dispose a plurality of ion generating units along a traveling path of the wire, and to judge a defect of the wire based on a result of comparing a plurality of current outputs of the current detecting unit with the defect presence threshold.
  9. 9. The defect inspection apparatus for a wire according to any one of claims 1 to 8, wherein, The terminal of the current detection means to which the current flowing in the winding is input is configured to flow the electric charge to the ground without outputting a voltage.
  10. 10. The defect inspection apparatus for a wire according to any one of claims 1 to 8, wherein, A terminal of the current detection unit that inputs a current flowing in the winding introduces the electric charge into the current detection unit by outputting a voltage.
  11. 11. A defect inspection system for a wire, comprising: A winding machine that winds a winding wire as a motor coil; the defect inspection apparatus according to any one of claims 3 to 8; An encoder disposed between the discharge needle of the defect inspection device and the motor coil for detecting the speed of the winding wire, and And a controller that calculates a defect position of the winding wire wound as the motor coil based on an output of the encoder and a defect detection signal output from the defect inspection device.
  12. 12. A defect inspection method for a wire, wherein, A winding machine for winding a wire around a motor coil, the defect inspection apparatus according to any one of claims 3 to 8, and an encoder for detecting a speed of the wire between a discharge needle of the defect inspection apparatus and the motor coil are used, a distance from a start of winding of the wire is set as a zero point, and a defect position of the wire is calculated based on a winding distance until a defect is detected and a winding distance after the defect is detected.

Description

Wire defect inspection device, wire defect inspection system, and wire defect inspection method Technical Field The present disclosure relates to a defect inspection apparatus for a wire, a defect inspection system for a wire, and a defect inspection method for a wire. Background When the insulating layer of the winding of the rotating electrical machine has defects such as damage and pinholes, the insulation between the winding and the core or between the winding and the ground is reduced. As a result, insulation damage occurs between adjacent windings of the coil on which the windings are formed, and there is a possibility that problems such as performance degradation, burnout, and leakage of the rotating electrical machine may occur. For this reason, the rotating electrical machine needs to be subjected to defect inspection of the winding wire. By applying a voltage to the traveling wire, a current generated at a defective portion of the wire during discharge is detected, and thus a defect of the wire can be detected. However, without limiting the current at the time of discharge, the insulating layer of the wire is damaged, and the defect may be further enlarged. Therefore, it is necessary to prevent the damage of the insulating layer when checking for a winding defect. In order to inspect a large damage caused by friction between a wire nozzle guiding a wire and the wire, a conventional wire defect inspection technique has been proposed in which a fixed resistor is added between an inspection power source and the wire to limit a current flowing during the inspection of the damage, thereby preventing the wire from being burned (for example, refer to patent document 1). Prior art literature Patent literature Patent document 1 Japanese patent application No. 6408229 Disclosure of Invention Problems to be solved by the invention According to the technique disclosed in patent document 1, a fixed resistor is added between the inspection power source and the winding wire, and a current flowing through a large damaged portion of about 1mm due to friction between the wire nozzle for guiding the winding wire to the wound member is limited. This can prevent burning of the damaged portion of the wire, and check whether the wire is damaged. On the other hand, when inspecting a defect (for example, a pinhole or a depression in which an insulating layer is thin) originally provided in a wire, the state of a power supply voltage and a current at the time of discharge are different depending on the size of the defect, and therefore, when inspecting a large defect and a small defect or a weak defect which is a depression in which an insulating layer is thin using a fixed resistor, if a low voltage is applied, the large defect can be detected, but the small defect and the weak defect cannot be detected, and if a high voltage is applied, the small defect and the weak defect can be detected, but when detecting the large defect, the insulating layer of the wire may be damaged. Therefore, the fixed resistor has a problem that it is not possible to detect all kinds of defects and prevent the insulating layer of the wire from being damaged. The present disclosure has been made to solve the above-described problems, and an object thereof is to provide a defect inspection apparatus for winding wires capable of detecting defects of a traveling winding wire with high reliability. Means for solving the problems A defect inspection device for a wire, which is a device for inspecting the presence or absence of a defect in a wire, wherein the wire is wound around a wound member and travels with a constant tension applied thereto, and wherein the defect inspection device for a wire is provided with an ion generating means arranged along a travel path of the wire to the wound member and generating ions surrounding the outer periphery of the wire, a current detecting means for detecting a current flowing in the wire as a result of the invasion of charges of the ions from a defective portion of the wire, and a defect presence or absence judging means for judging the presence or absence of a defect in the wire based on a result of comparing an output of the current detecting means with a predetermined defect presence or absence threshold. Effects of the invention According to the defect inspection apparatus for a wire according to the present application, it is possible to detect a defect of a wire in progress with high reliability by detecting a current generated by intrusion of electric charges of ions generated by the ion generating unit into a defective portion of the wire. Drawings Fig. 1 is a block configuration diagram showing the configuration of a wound defect inspection apparatus according to embodiment 1. Fig. 2 is a diagram illustrating a principle of defect detection of a wire winding using ions. Fig. 3 is a diagram showing the output of the minute ammeter, the output of the inspection signal processing means, and the output o