JP2013229945A - Electrification fixing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrification fixing method capable of heating a coil wire constituting a three-phase AC dynamo-electric machine uniformly while shortening the time required for electrification heating.SOLUTION: In a dynamo-electric machine, a U-phase coil wire 28u, a V-phase coil wire 28v, and a W-phase coil wire 28w are connected in star in N-phase. The N-phase is configured so that it can be electrified from the outside. In the electrification fixing method, the U-phase coil wire 28u, V-phase coil wire 28v, and W-phase coil wire 28w are electrified simultaneously by using the N-phase as an electrification terminal. Since each coil wire 28u, 28v, 28w is electrification heated simultaneously in parallel by using the N-phase as an electrification terminal, processing time can be shortened.

Description

  The present invention relates to a method for manufacturing a rotating electrical machine, and more particularly, to an energization fixing method for fixing coil wires to each other by energizing and heating a coil wire having a fusion layer.

  2. Description of the Related Art Conventionally, there has been known means for energizing coil wires to melt a fused layer of the coil wires by Joule heat and fix the coil wires together. It is also known to use this means to fix the coil wires of a rotating electrical machine (for example, see Patent Document 1 below). In the rotating electrical machine, when the coil wires are fixed to each other, wear between the coil wires due to torque and vibration generated in the coils can be prevented.

Japanese Patent Laid-Open No. 11-18378

  By the way, in the manufacturing process of a rotating electrical machine by three-phase alternating current, when a coil wire is energized and heated after combining a plurality of coils into a motor core (stator core or rotor core) state, the connection between the coil wires has already been completed. Therefore, it can be energized only in the same state as the energized state of the rotating electrical machine. That is, normally, in the case of a rotating electrical machine using three-phase alternating current, power is supplied to the coil wires constituting each phase by using three-phase terminals of U phase, V phase, and W phase. In this case, in order to uniformly heat the three phases, the energization of the coil wires of the two phases of the three phases is sequentially switched at regular intervals, so that the heating is uniformly performed as a whole. However, this method does not energize and heat the three-phase coil wires at the same time, and there is always a time during which the one-phase coil wire is not energized and heated among the three-phase coil wires. For this reason, in the conventional method, there is a problem that efficient heating is difficult if the three-phase coil wire is to be heated uniformly.

  The present invention has been made in consideration of such problems, and provides an energization fixing method capable of uniformly heating a coil wire constituting a rotating electrical machine using three-phase alternating current and reducing the time required for energization heating. The purpose is to do.

  In order to achieve the above object, the present invention provides an energization fixing method in which the coil wires are fixed to each other by energizing and heating coil wires in a rotating electrical machine using a three-phase alternating current. A wire, a V-phase coil wire, and a W-phase coil wire are star-connected in the N-phase, and the U-phase coil wire, the V-phase coil wire, and the W-phase coil are used by using the N-phase as an energizing terminal. It is characterized by energizing the wire simultaneously.

  According to the energization fixing method of the present invention described above, the N-phase is used as the energization terminal, whereby the coil wires constituting the three phases are energized and heated simultaneously in parallel. Compared to the conventional method, the processing time can be shortened.

  In the energization fixing method, the N phase is configured to be energized from the outside, and a first terminal is provided at each end of the U phase coil wire, the V phase coil wire, and the W phase coil wire. The energization may be performed by applying a voltage having a polarity and applying a voltage having a second polarity opposite to the first polarity to the N phase.

  Thereby, even after combining a plurality of coils in the assembly process of the rotating electrical machine, simultaneous energization to the coil wires constituting the three phases using the N phase can be easily performed.

  In the energization fixing method, the energization includes a first energization step of applying a first current and a second energization step of applying a second current smaller than the first current after the first energization step. It is good to have.

  Thus, by changing the current in the energization heating step, the coil can be prevented from being overheated to prevent the rotating electrical machine from being destroyed, and the energization heating time can be effectively shortened.

  In the energization fixing method described above, the temperature during energization heating of the coil wire is detected, and when the temperature of the coil wire reaches a predetermined temperature, the first energization step may be shifted to the second energization step.

  As a result, since the switching from the first current (large current) to the second current (small current) is performed when the temperature of the coil reaches a temperature at which the fusion layer can be melted, the coil wire is fused. The layer can be reliably melted, and variations in the electric heating treatment due to the influence of the working environment can be suppressed.

  In the energization fixing method described above, the temperature of the coil wire may be detected by detecting the temperature of the outer peripheral portion of the coil constituted by the coil wire.

  Since the outer periphery of the coil is considered to be the place where the temperature is most difficult to rise, the coil portion is configured by switching from the first energization process to the second energization process when the temperature of this part reaches a predetermined temperature. The entire coil wire can be reliably heated to a predetermined temperature.

  According to the energization fixing method of the present invention, it is possible to uniformly heat the coil wire constituting the rotating electrical machine using three-phase alternating current and to reduce the time required for energization heating.

It is a top view of the stator of the rotary electric machine to which the energization fixing method of the present invention is applied. It is a perspective view of the division | segmentation core part which comprises the stator shown in FIG. It is explanatory drawing of the electricity_supply fixing method of this invention. It is a schematic diagram explaining how to flow the current to the coil of each phase in the energization fixing method of the present invention. FIG. 5A is a graph showing the relationship between the energization time in the energization processing and the coil temperature, and FIG. 5B is a graph showing the relationship between the energization time in the energization processing and the output current.

  Hereinafter, preferred embodiments of the energization fixing method according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a plan view of a stator 10 incorporated in a rotating electrical machine to which the energization fixing method of the present invention is applied. The stator 10 constitutes a rotating electric machine in combination with a rotor (not shown) provided therein, and is used as, for example, an electric motor or a generator.

  The stator 10 is a so-called three-phase star connection salient-pole stator 10, and as shown in FIG. 1, includes a hollow cylindrical tube portion 12a and a flange 12b protruding outward from the tube portion 12a. Holder 12, three-phase input terminals 14U, 14V, 14W provided on holder 12, N-phase terminal 14N forming a neutral point, and annular stator core disposed along the inner peripheral surface of cylindrical portion 12a 18.

  The stator core 18 includes a plurality (18 in FIG. 1) of divided core portions 20, and the divided core portions 20 are arranged adjacent to each other in the circumferential direction, and are configured in an annular shape as a whole. In the present embodiment, specifically, the stator core 18 includes six divided core portions 20 each having U-phase, V-phase, and W-phase coils 30. In this case, in the stator core 18, the plurality of divided core portions 20 are arranged in an annular shape, so that the U phase (U1 phase to U6 phase), the V phase (V1 phase to V6 phase), and the W phase (W1 phase to W6). The coils 30 are arranged in the order of U1, V1, W1, U2,..., U6, V6, W6 in the clockwise direction of FIG.

  Next, among the divided core portions 20 having the coils 30 of the U1 phase to U6 phase, the V1 phase to V6 phase, and the W1 phase to W6 phase, the configuration of one divided core portion 20 is typically shown in FIG. Will be described with reference to FIG. In addition, the structure of the split core part 20 demonstrated here is a structure common to the split core part 20 of all the phases.

  The divided core portion 20 is wound around the insulator 26, a divided iron core 24 configured by laminating a plurality of substantially T-shaped metal plates 22 punched by a press, an insulator 26 that electrically insulates the divided iron core 24, and the insulator 26. And a coil 30 constituted by the coil wire 28 to be formed.

  The split iron core 24 includes a yoke portion 24 a extending along the circumferential direction of the stator core 18 and a magnetic pole portion 24 b protruding from the yoke portion 24 a toward the inside of the stator core 18.

  The insulator 26 is a hollow cylindrical member made of an electrically insulating material such as a flexible resin. The insulator 26 includes a winding part 32 around which the coil wire 28 is wound, and a lead-out part 34 protruding from one end side of the winding part 32. The winding portion 32 includes an upper winding portion 32a and a lower winding portion 32b that can be fitted to each other in the (vertical direction). The lead portion 34 is a portion for routing the end portion (start end portion or end end portion) of the coil wire 28 to the positions of the input terminals 14U, 14V, 14W and the N-phase terminal 14N along the circumferential direction of the stator core 18. .

  When the upper winding part 32a and the lower winding part 32b are fitted so as to sandwich the magnetic pole part 24b of the split core 24 in the assembly process of the split core part 20, the upper winding part 32a and the lower winding part The winding portion 32 is configured by overlapping and joining each part of 32b. In addition, the magnetic pole portion 24 b is fitted in the hole formed in the central portion of the winding portion 32, while the coil 30 is wound around the winding portion 32 to constitute the coil 30.

  The coil wire 28 includes a conductor (conductive wire) made of a conductive material (for example, copper), an insulating layer that covers the periphery of the conductor, and a fusion layer that covers the periphery of the insulating layer. As will be described later, after the stator 10 is assembled, the coil wire 28 is heated by energization, whereby the fused layer of the coil wire 28 is melted, thereby fixing the coil wires 28 to each other. Examples of the constituent material of the fusion layer include polyvinyl bratil, polyamide, nylon, epoxy, and the like.

  A plurality of conductor holding grooves 36 a to 36 d extending in the circumferential direction of the stator core 18 are provided in the routing portion 34 at intervals in the vertical direction. Further, an end fixing portion 38 that fixes the end portion of the coil wire 28 wound around the winding portion 32 is provided on the back side of the lead-out portion 34 (inner diameter side of the stator core 18).

  In the stator core 18, the coil wires 28 having the same shape are wound around the divided core portions 20 to form the coils 30. The starting end portion of each coil wire 28 constituting the U1 phase to U6 phase coil 30 is connected to the input terminal 14U, and the starting end portion of each coil wire 28 constituting the V1 phase to V6 phase coil 30 is connected to the input terminal 14V. The starting end of each coil wire 28 constituting the W1 phase to W6 phase coil 30 is connected to the input terminal 14W, and the coils 30 of all phases (U1 to U6 phase, V1 to V6 phase, W1 to W6 phase). Are connected to the N-phase terminal 14N.

  Of the conductor holding grooves 36a to 36d, the conductor holding groove 36a provided at the uppermost part is formed deeper than the other conductor holding grooves 36b to 36d. A total of 18 terminal portions of the coil wire 28 are routed from and stored in the conducting wire holding groove 36a. In each divided core portion 20, the terminal portion of the coil wire 28 wound around the winding portion 32 is fixed to the terminal fixing portion 38 and is drawn around the conductor holding groove 36 a.

  The other conductive wire holding grooves 36b to 36d have a shallower depth than the conductive wire holding groove 36a in which the starting end portion of each coil wire 28 is accommodated. In the conducting wire holding groove 36b, the start ends of the six coil wires 28 are drawn and stored in total in the U1-phase to U6-phase. In the conducting wire holding groove 36c, the start ends of the six coil wires 28 are drawn and stored in total in the V1 phase to V6 phase. In the lead wire holding groove 36d, the starting end portions of the six coil wires 28 in total in the W1 phase to W6 phase are drawn and stored.

  Hereinafter, when the U-phase, V-phase, and W-phase coil wires 28 are described separately, “U-phase coil wire 28u” (or “coil wire 28u”) and “V-phase coil wire 28v” ( Or “coil wire 28v”) or “W-phase coil wire 28w” (or “coil wire 28w”).

  After the stator 10 constituting the rotating electric machine is assembled as shown in FIG. 1, the coil wires 28 are energized and heated in order to fix the coil wires 28 constituting the coil 30 to each other. An energization fixing process for fixing is performed. FIG. 3 is a diagram showing a schematic configuration of an energization fixing device 40 for carrying out the energization fixing method of the present invention.

  As shown in FIG. 3, the energization fixing device 40 includes electrodes 42U, 42V, 42W, 42N that can contact each terminal (input terminals 14U, 14V, 14W and N-phase terminal 14N) provided on the stator 10, and electrodes A power supply device 44 that can energize each of the three-phase coils 30 of the stator 10 via 42U, 42V, 42W, and 42N, and a control unit 46 that controls the power supply device 44 are provided.

  The energization fixing device 40 is provided with, for example, a mounting table (not shown) capable of fixing the stator 10, and the stator 10 carried into the energization fixing device 40 is mounted and fixed on the mounting table. The electrodes 42U, 42V, 42W, and 42N are, for example, positions spaced from the terminals 14U, 14V, 14W, and 14N of the stator 10 fixed to the mounting table, and positions that are in contact with the terminals 14U, 14V, 14W, and 14N. It is configured to be displaceable between. FIG. 3 schematically shows a state where the electrodes 42U, 42V, 42W, and 42N are in contact with the terminals 14U, 14V, 14W, and 14N.

  Electrodes 42U, 42V, and 42W connected to the positive pole of the power supply device 44 are connected in parallel to the input terminals 14U, 14V, and 14W of each phase of the stator 10, and the power supply device 44 is connected to the N-phase terminal 14N of the stator 10 in parallel. An electrode 42N connected to the negative pole is connected. The control unit 46 has a function of controlling the output current from the power supply device 44.

  The energization fixing device 40 in this embodiment is further provided with a temperature detector 48 that detects the temperature of the coil wire 28 during energization heating. The temperature detector 48 is, for example, a non-contact thermometer. In the present embodiment, the temperature detector 48 detects the temperature of the surface (outer peripheral surface) of the coil 30 that is being energized and heated. The temperature information detected by the temperature detector 48 is transmitted to the control unit 46 and used for controlling the power supply device 44 by the control unit 46, as will be described later.

  Using the energization fixing device 40 configured as described above, in the energization fixing method of the present invention, the energization heating of the coil wire 28 of the stator 10 can be performed as follows. FIG. 4 is a schematic diagram illustrating a state of energization of the coil wires 28u, 28v, and 28w in the stator 10 during energization heating. As shown in FIG. 1, the stator 10 is provided with six sets of U-phase, V-phase, and W-phase coil wires 28u, 28v, and 28w that are star-connected. In order to facilitate, typically, only one set of U-phase, V-phase, and W-phase coil wires 28u, 28v, and 28w that are star-connected is shown.

  As shown in FIG. 4, in the energization fixing method according to the present invention, the U-phase coil wire 28u, the V-phase coil wire 28v, and the W-phase coil wire 28w are energized simultaneously using the N-phase terminal 14N. Specifically, the first polarity voltage is applied to the input terminals 14U, 14V, and 14W provided at the ends of the U-phase coil wire 28u, the V-phase coil wire 28v, and the W-phase coil wire 28w, and the first By applying a voltage having a second polarity opposite to the first polarity to the N-phase terminal 14N, energization is performed for a predetermined time.

  In the present embodiment, the first polarity voltage applied to each of the input terminals 14U, 14V, 14W of the U-phase coil wire 28u, V-phase coil wire 28v, and W-phase coil wire 28w is a positive voltage, and the N-phase terminal 14N Although the second polarity applied to the negative voltage is a negative voltage, the positive / negative relationship of the applied voltage may be reversed. That is, a positive voltage may be applied to the N-phase terminal 14N and a negative voltage may be applied to the input terminals 14U, 14V, and 14W.

  When the coil wires 28u, 28v, 28w are energized in this way, the resistance values of the coil wires 28u, 28v, 28w are the same, so that the current values i1-i3 flowing in the coil wires 28u, 28v, 28w. Are identical to each other. In this case, the sum of the current values i1 to i3 flowing through the coil wires 28u, 28v and 28w is equal to the current value I flowing through the N phase. When such energization is performed, the fused layers of the coil wires 28u, 28v, 28w are melted by Joule heat, so that the coil wires 28u, 28v, 28w are fixed to each other.

  According to the energization fixing method of the present invention as described above, the N-phase is used as the energization terminal so that the coil wires 28u, 28v, 28w constituting the three phases are energized and heated simultaneously in parallel. The time required for heating can be shortened as compared with the conventional method in which energization heating is performed with a shift. Moreover, since the current values flowing through the coil wires 28 are the same, the coil wires 28u, 28v, 28w can be heated substantially uniformly.

  In the present embodiment, since the N-phase terminal 14N is provided on the outer peripheral side of the stator core 18, even after the stator 10 is completed, the N-phase can be easily energized from the outside. Therefore, even after the plurality of coils 30 are combined (after the completion of the stator 10) in the assembly process of the rotating electrical machine, the parallel to the coil wires 28u, 28v, 28w constituting the three phases using the N phase is performed in parallel. Can be easily energized.

  In the case of this embodiment, in energizing each coil wire 28u, 28v, 28w, a small current is applied after a large current is applied for a short time. That is, the energization of each coil wire 28u, 28v, 28w includes a first energization step of applying a first current and a second energization of applying a second current smaller than the first current after the first energization step. Process.

  In order to melt the fusion layer constituting the outermost layer of the coil wire 28, it is necessary to heat it to a predetermined temperature, and heating with a large current takes a shorter time. On the other hand, if a large current is continuously applied to the coil wire 28, the temperature of the coil wire 28 becomes too high, and the stator 10 may be damaged by heat. Therefore, in the present embodiment, as shown in FIGS. 5A and 5B, a predetermined temperature T sufficient to melt the fused layer of the coil wire 28 by applying a large current for heating at the initial stage of energization. After a predetermined temperature T is reached, a small current for heat retention is applied to maintain the temperature for a certain period of time. In this way, by changing the magnitude of the current applied to the coil wire 28 in the energization heating step, the coil wire 28 is prevented from being overheated to prevent the stator 10 from being damaged, and the energization heating time is reduced. It can be shortened effectively.

  In this case, in this embodiment, when the temperature of the coil wire 28 during energization heating is detected and the temperature of the coil wire 28 reaches a predetermined temperature, the process proceeds from the first energization process to the second energization process. Specifically, in the present embodiment, the temperature detector 48 (see FIG. 3) detects the temperature of the surface (outer peripheral portion) of the coil 30 during energization heating. Based on the temperature information sent from the temperature detector 48, the control unit 46, when the temperature of the coil wire 28 reaches the predetermined temperature T (time t in FIGS. 5A and 5B), the first temperature-raising first. The power supply device 44 is controlled so as to switch the applied current from the current to the second current for heat insulation.

  As described above, the switching from the first current (large current) to the second current (small current) is performed when the temperature of the coil wire 28 reaches a temperature at which the fusion layer can be melted. The 28 fusion layers can be reliably melted. That is, for example, a method of switching from the first current to the second current based on the elapsed time from the start of energization is conceivable. In this case, the heating temperature of the coil 30 depends on the work environment (ambient temperature). Therefore, there is a possibility that the fusion layer is not melted reliably. On the other hand, in this embodiment, since the current value is switched from the first current to the second current based on the temperature of the coil 30 that is being heated by current, the variation of the current heating process due to the influence of the work environment is reduced. In this way, the fused layer of the coil wire 28 can be reliably melted.

  In the case of the present embodiment, in detecting the temperature of the coil wire 28, the temperature of the outer peripheral portion of the coil 30 constituted by the coil wire 28 is detected. Since the outer peripheral portion of the coil 30 is considered to be the place where the temperature hardly rises in the coil 30, by switching from the first energization process to the second energization process at the timing when the temperature of this part reaches the predetermined temperature T. The entire coil wire 28 constituting the coil 30 portion can be reliably heated to a predetermined temperature.

  In the above description, the present invention has been described with reference to preferred embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. Yes.

DESCRIPTION OF SYMBOLS 10 ... Stator 12 ... Holder 14U, 14V, 14W ... Input terminal 14N ... N-phase terminal 18 ... Stator core 20 ... Divided core part 28 ... Coil wire 28u ... U-phase coil wire 28v ... V-phase coil wire 28w ... W-phase coil wire 30 ... Coil 40 ... Current-clamping device 42U, 42V, 42W, 42N ... Electrode 44 ... Power supply device 46 ... Control unit 48 ... Temperature detector

Claims (5)

By energizing and heating coil wires in a rotating electrical machine using three-phase alternating current, the energizing fixing method for fixing the coil wires to each other,
In the rotating electrical machine, a U-phase coil wire, a V-phase coil wire, and a W-phase coil wire are star-connected in the N phase,
Using the N phase as an energization terminal, energizing the U phase coil wire, the V phase coil wire, and the W phase coil wire simultaneously,
A current-carrying fixing method characterized by the above. The energization fixing method according to claim 1,
The N phase is configured to be energized from the outside,
A voltage having a first polarity is applied to a terminal provided at each end of the U-phase coil wire, the V-phase coil wire, and the W-phase coil wire, and a second polarity that is opposite to the first polarity. The energization is performed by applying a polarity voltage to the N phase.
A current-carrying fixing method characterized by the above. In the energization fixing method according to claim 1 or 2,
The energization is
A first energization step of applying a first current;
After the first energization step, a second energization step of applying a second current smaller than the first current,
A current-carrying fixing method characterized by the above. In the energization fixing method according to claim 3,
Detecting the temperature during energization heating of the coil wire,
When the temperature of the coil wire reaches a predetermined temperature, the process proceeds from the first energization process to the second energization process.
A current-carrying fixing method characterized by the above. In the energization fixing method according to claim 4,
In the detection of the temperature of the coil wire, the temperature of the outer peripheral portion of the coil constituted by the coil wire is detected.
A current-carrying fixing method characterized by the above.

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