JP5231307B2 - Coil quality inspection apparatus and coil quality inspection method - Google Patents

Description

  The present invention relates to a coil quality inspection apparatus and method for pressing a coil wound around a winding core and inspecting the insulation of the coil.

  Conventional coils are manufactured by winding a conducting wire around a winding core at a low speed, and the adhesiveness between the winding core and the conducting wire is high, and the coil volume is good. However, in order to improve productivity, a coil may be manufactured by winding a conducting wire around a winding core at high speed. The high-speed wound coil manufactured in this way has low adhesion between the winding core and the conductive wire, causes swelling, and increases the coil volume.

  Miniaturization is required for electric motors such as motors mounted on hybrid vehicles and electric vehicles. When a high-speed winding coil is used as the split coil constituting such an electric motor, it is necessary to reduce the coil volume in order to prevent contact with adjacent coils. Therefore, by pressing the coil toward the winding core using the pressing member, the coil may be shaped to match the outer shape of the winding core to reduce the coil volume. Moreover, as disclosed in Patent Document 1, by pressing the coil strongly toward the core using a pressing member, the cross-sectional shape of the conducting wire constituting the coil is compressed and deformed, and the coil space factor is determined. May increase.

JP 2000-41365 A

  However, when the coil is pressed by the pressing member to be shaped or compressed and deformed, the insulating coating of the conductor may be damaged. Therefore, it is necessary to perform an insulation test on the coil surface after releasing the pressure. This inspection is performed by conducting a current from the end of the wire while the electrode member is in contact with the coil surface. At this time, in order to bring the electrode member into contact with the coil surface, it is necessary to transfer the coil to the inspection table or remove the pressing member and install the electrode member after releasing the pressing of the pressing member to the coil. That is, a coil fixing member and a member to be brought into contact with the coil surface are required for pressing and inspection, respectively. Therefore, there is a problem that it takes a long time to set up the insulation test of the coil after pressing.

  In view of such circumstances, it is an object of the present invention to provide a coil quality inspection apparatus and method capable of performing a coil insulation inspection setup after pressing in a short time.

The present invention relates to a coil quality inspection apparatus for performing insulation testing coil formed by winding an insulation coated conductor wire in the core, the front side of the coil pressing member made of a conductor on the winding core A coil pressing unit that shapes the coil by pressing the coil toward the coil; an energization unit that supplies current to the coil; and a detection unit that detects a conduction state between the pressing member and the coil. .

According to the present invention, the pressing member brought into contact with the surface of the coil when the coil is pressed and shaped is made of a conductor, and the conduction state between the pressing member and the coil is detected by the detection unit. Therefore, after the shaping by pressing the coil is completed, it is possible to inspect the insulation of the coil surface by keeping the pressing member in contact with the surface of the coil and detecting the conduction state between the pressing member and the coil. it can. Therefore, as compared with the prior art, it is possible to set up the insulation test of the coil performed after shaping by pressing in a short time. Furthermore, since the pressing member also serves as an electrode member at the time of the insulation test, the entire apparatus can be simplified and miniaturized as compared with the prior art.

  Moreover, in this invention, it is preferable that the surface which contacts the surface of the said coil of the said pressing member has a level | step difference matched with the external shape of this coil.

  In this case, since the area which contacts the surface of the coil of a press member increases, an insulation test | inspection can be performed more reliably.

The present invention relates to a coil inspection method for performing insulation testing coil formed by winding an insulation coated conductor wire in the core, the front side of the coil pressing member made of a conductor on the winding core A step of shaping the coil by pressing toward the coil, a step of passing a current through the coil, and a step of detecting a conduction state between the pressing member and the coil.

According to the present invention, the pressing member brought into contact with the surface of the coil in the step of pressing and shaping the coil is made of a conductor, and the conduction state between the pressing member and the coil is detected by the detection unit. Therefore, after the shaping by pressing the coil is completed, it is possible to inspect the insulation of the coil surface by keeping the pressing member in contact with the surface of the coil and detecting the conduction state between the pressing member and the coil. it can. Therefore, it is possible to set up the coil insulation test after pressing in a shorter time than in the past.

Further, in the present invention, a pair of wire holding parts having a holding part that can hold the conductive wire and a blade part that can cut the conductive wire, and the pair of wire holding parts that can be opened and closed by hand It is preferable that at least one end of the conductive wire is sandwiched between the pair of wire rod sandwiching portions of the inspection tool having a grip portion that can be cut, and a current is passed through the coil via the wire rod sandwiching portion.

  In this case, it is possible to pass a current through the coil using an inspection tool that is preferably used when the coil is cut so that the resistance value satisfies the reference value. Therefore, by using this inspection tool, the step of newly installing an electrode member for energizing the coil can be omitted, so that it is possible to set up the insulation test of the coil after pressing in a shorter time. It becomes.

The fragmentary sectional view which shows the outline of the coil quality inspection apparatus which concerns on embodiment of this invention. Explanatory drawing which shows the connection of the measuring device of a coil quality inspection apparatus. The perspective view which shows an inspection tool. It is a figure explaining the usage method of a test | inspection tool, (a) shows a half cut state and (b) shows a full cut state.

  A coil quality inspection apparatus and method according to an embodiment of the present invention will be described with reference to the drawings.

  Referring to FIG. 1, a coil quality inspection apparatus 10 according to an embodiment of the present invention includes a coil pressing portion 50 that presses a coil 30 wound around a tooth portion (core) 21 of a core 20 with a pressing member 40. I have.

  Although the details are not shown here, the core 20 is a split core that constitutes a stator of an electric motor suitably used for a hybrid vehicle or the like. The core 20 includes a tooth portion 21 and an arc-shaped yoke portion 22 that extend in the inner diameter direction. The teeth part 21 is a substantially rectangular parallelepiped having a substantially rectangular cross section, and a coil 30 is wound on the outer surface thereof.

  The core 20 includes a laminated steel plate 23 in which a plurality of press-formed substantially T-shaped steel plates are integrated, and an insulator 24 formed from a resin material that insulates the laminated steel plate 23. A portion corresponding to the vertical side of the T shape is the teeth portion 21, and a portion corresponding to the upper side of the T shape is the yoke portion 22.

  The coil 30 is configured by winding a conductive wire 31 around the teeth portion 21 at a high speed by a winding machine (not shown). Initially, in the coil 30, the tooth portion 21 and the conductive wire 31 are not sufficiently adhered, and particularly, the vicinity of the central portion of each side of the rectangular shape of the tooth portion 21 is swollen, and the coil volume is large. Although not shown in detail, the conducting wire 31 has an insulating coating, for example, a copper wire having an enamel coating. The cross section of the conducting wire 31 is round here. However, the cross section of the conducting wire 31 may have a shape other than a round shape, for example, a substantially rectangular shape.

  The coil 30 is wound around the tooth portion 21 with a step. Specifically, the conducting wire 31 is wound so that the cross-sectional outer shape of the coil 30 tapers stepwise toward the tip of the tooth portion 21, that is, the center of the stator. Thereby, the contact between adjacent coils 30 is prevented, and the electric motor is reduced in size.

  The coil quality inspection device 10 includes a fixing unit (not shown), and the core 20 around which the coil 30 is wound around the tooth portion 21 is fixed to a predetermined position of the coil quality inspection device 10 by this fixing unit.

  The pressing member 40 is in contact with the surface of the coil 30 and presses the coil 30 toward the teeth portion 21 and is formed of a hard conductor such as steel. However, the contact portion of the pressing member 40 with the coil 30 may be formed of a soft conductor. Four pressing members 40 are provided so as to face the four outer surfaces of the teeth portion 21 made of a substantially rectangular parallelepiped.

  The pressing member 40 has a step corresponding to the step on the coil surface in contact with the coil surface. This increases the contact area between the pressing member 40 and the coil surface. In addition, the contact surface with the coil surface of the pressing member 40 may be an inclined surface that is substantially matched to the step on the coil surface that is in contact.

  The coil pressing part 50 is provided with a sliding means capable of reciprocatingly sliding each pressing member 40 in the teeth part 21 direction and the opposite direction. The sliding means is, for example, a hydraulic cylinder, and the pressing member 40 is fixed to the tip of the piston.

  By bringing the pressing member 40 into contact with the coil surface and moving in the direction of the tooth portion 21, the adhesion between the tooth portion 21 and the conductive wire 31 is increased, the swelling is eliminated, and the coil 30 is matched to the outer shape of the tooth portion 21. It is shaped. Thereby, the volume of the coil 30 becomes equivalent to when the conducting wire 31 is wound at a low speed. The coil 30 may be strongly pressed by the pressing member 40 to such an extent that the cross-sectional shape of the conducting wire 31 is deformed. In this case, it is preferable because the space factor of the coil 30 is improved and the density is increased by deforming the cross section of the conducting wire 31 from a round shape to a substantially polygonal shape including a substantially rectangular shape.

  With reference to FIG. 2, the coil quality inspection apparatus 10 further includes a measuring instrument (detection unit) 60 for inspecting the insulation of the coil 30.

  Each pressing member 40 is electrically connected to the measuring instrument 60 via the switch 61, and any one pressing member 40 is alternatively electrically connected to the measuring instrument 60 by switching the switch 61. Is done.

  Probes 62 made of a conductor are electrically connected to both ends of the winding wire 31 constituting the coil 30 at the beginning and end of winding. These probes 62 are electrically connected to the measuring instrument 60 via the switch 63, and any one of the probes 62 is alternatively electrically connected to the measuring instrument 60 by switching the switch 63. The measuring instrument 60 includes a power source, and by switching the switch 63, a current can be passed through the coil 30 from either one of both ends of the conducting wire 31. Note that the measuring instrument 60 and the probe 62 correspond to the energization unit of the present invention.

  Next, a coil quality inspection method according to an embodiment of the present invention using the coil quality inspection apparatus 10 will be described.

  First, the coil 30 is formed by winding the conducting wire 31 around the tooth portion 21 of the core 20 at a high speed. Then, the core 20 around which the coil 30 is wound around the tooth portion 21 is fixed at a predetermined position of the coil quality inspection apparatus 10.

  Next, each pressing member 40 is moved toward the teeth portion 21 by the coil pressing portion 50, the pressing members 40 are brought into contact with the coil surface, and further, the pressing member 40 is pressed in this state to shape the coil 30.

  Then, while maintaining the state in which the pressing member 40 is in contact with the coil surface, the probes 62 are attached to both ends of the conducting wire 31 and the coil 30 is energized. At this time, the current is measured by the measuring instrument 60 while switching the switches 61 and 63.

  When the current measured by the measuring instrument 60 exceeds a minute predetermined value, it is determined that the coil surface is damaged and the coil 30 has a poor insulation. On the other hand, when the current measured by the measuring instrument 60 is less than or equal to a minute predetermined value, it is determined that the coil surface is not damaged and the insulation of the coil 30 is good.

  Thereafter, the probe 62 is removed, each pressing member 40 is retracted by the coil pressing portion 50, and the core 20 around which the coil 30 is wound is taken out.

  As described above, the pressing member 40 that is in contact with the coil surface is a conductor, and the insulation inspection of the coil surface is performed via the pressing member 40, so that the insulating property of the coil 30 that is performed after pressing is compared with the conventional case. Inspection setup can be performed in a short time. Furthermore, since the pressing member 40 also serves as an electrode member at the time of the insulation test, the overall configuration of the apparatus can be simplified and miniaturized as compared with the prior art.

  In addition, this invention is not limited to what was mentioned above. For example, in the embodiment, the case has been described in which the probes 62 are attached to both ends of the conducting wire 31 and current is supplied from the probe 62 to the coil 30. However, instead of the probe 62, the inspection tool 70 shown in FIG.

  The inspection tool 70 grips a pair of wire holding parts 73 having a holding part 71 capable of holding the conducting wire 31 and a blade part 72 capable of cutting the conducting wire 31, and a pair of wire holding parts 73 so as to be opened and closed by hand. The grip part 74 which can do is provided.

  Referring to FIG. 4A, when the end portion of the conducting wire 31 is sandwiched between the pair of wire holding parts 73 while holding the grip part 74 of the inspection tool 70, the blade part 72 of the pair of wire holding parts 73 is insulated. The conducting wire 31 is partially cut, and the holding portion 71 of the pair of wire holding portions 73 holds the uncut portion of the conducting wire 31. Thereby, the conducting wire 31 is in a half-cut state, and the wire holding portion 73 of the inspection tool 70 is in contact with and electrically connected to the conducting wire 31. Here, the wire pinching portion 73 of the inspection tool 70 is electrically connected to the measuring instrument 60 via a lead wire or the like, and the coil 30 is energized. Thereby, the insulation test of the coil 30 can be performed.

  The inspection tool 70 is preferably used when the coil 30 is cut so that the resistance value satisfies the reference value. That is, the resistance value of the coil 30 during the half-cutting is measured, and if this measured value satisfies the reference value, the value measured using the inspection tool 70 according to FIG. 4B is used. The coil 30 can be cut (main cut) at the position.

  As described above, by using the inspection tool 70, it is not necessary to attach the probes 62 to both ends of the conducting wire 31, so that it is possible to set up the insulation inspection of the coil 30 performed after pressing in a short time.

  In addition, this invention is not limited to what was mentioned above. For example, in the embodiment, the case where the four pressing members 40 are pressed from the side surface of the coil 30 to shape the coil 30 has been described. However, the coil 30 may be shaped by bringing a wedge (pressing member) made of a tapered conductor into contact with the side surface of the coil 30 and pushing the wedge downward. A roller may be used as the pressing member.

  DESCRIPTION OF SYMBOLS 10 ... Coil quality inspection apparatus, 20 ... Core, 21 ... Teeth part (core), 30 ... Coil, 31 ... Conductor, 40 ... Pressing member, 50 ... Coil pressing part, 60 ... Measuring instrument (detection part, electricity supply part) 62 ... Probe (electric conduction part), 70 ... Inspection tool.

Claims (4)

A coil quality inspection device for inspecting insulation of a coil formed by winding a conductive wire with insulation coating around a core,
A coil pressing portion for shaping the coil by pressing toward the front side of the coil to the winding core by the pressing member made of a conductor,
An energization section for energizing the coil with current;
A coil quality inspection apparatus comprising: a detection unit that detects a conduction state between the pressing member and the coil.   The coil quality inspection device according to claim 1, wherein a surface of the pressing member that comes into contact with the surface of the coil has a step corresponding to an outer shape of the coil. A coil quality inspection method for inspecting insulation of a coil formed by winding a conductive wire coated with insulation on a core,
A step of shaping the coil by pressing toward the front side of the coil to the winding core by the pressing member made of a conductor,
Passing a current through the coil;
And a step of detecting a conduction state between the pressing member and the coil. It has a pair of wire holding parts which have a holding part which can hold the conducting wire, and a blade part which can cut the conducting wire, and a grip part which can grasp the pair of wire holding parts so that opening and closing operation is possible by hand. The pair of wire rod sandwiching portions of the inspection tool are in a half-cut state by sandwiching at least one end of the conducting wire, and current is passed through the coil through the wire rod sandwiching portion. Coil quality inspection method.

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