JP2011134973A - Energizing curing method of molded coil, and energizing curing device of molded coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To AC-energize a coil to cure resin and to correctly detect the temperature of the resin. <P>SOLUTION: A coil terminal 1c is led out of a part which is one-half the total number of turns of four unit coils 2a-2d of a resin molded coil 1. A power source terminal 6a of a heating power source 6 for AC-energization is connected with coil terminals 1a, 1b and a power source terminal 6b is connected with the coil terminal 1c to AC-energize it to heat-cure the resin for formation of a mold layer 4. In a coil 3, since an energization direction to the unit coils 2a, 2b is opposite to an energization direction to the unit coils 2c, 2d, generated magnetic fluxes cancel each other, thereby reducing the total inductance to interrupt reactive power. AC-energization allows to control unusual curing of the resin. The temperature of the resin is detected by switching to DC-energization by the heating power source 6 and calculating the resistance value of the coil 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  According to the present invention, after placing a coil in a mold, a resin (thermosetting resin) is injected into the mold, and the resin is heated and cured by energizing the coil. The present invention relates to an electric curing device.

  A molded coil of an electric device, for example, a transformer is manufactured by placing a coil in a mold, injecting a resin into the mold, and heating and curing the resin. In this case, when the resin injected into the mold is cured, it is desirable that the resin be cured from the center of the resin in order to reduce the stress remaining in the cured resin.

  Therefore, conventionally, the mold in which the resin is injected into the heating furnace is accommodated and the resin is heated from the outside, and the resin is heated and cured from the inside by flowing current to the coil to generate heat, or Heat curing is performed only by passing an electric current through the coil without using a heating furnace.

  It has been found that the resin starts to be cured when heated to a predetermined temperature, and the curing is completed by continuing the heating for a time set according to the amount of the resin from the start of the curing. For this reason, a thermocouple is attached to the surface of the mold to detect the mold surface temperature, or the air temperature in the heating furnace is detected to detect the resin curing start temperature, thereby causing unnecessary heating. Did not do.

  However, the indirect temperature detection as described above cannot accurately detect the temperature of the resin, so that the detection of the resin curing start time becomes inaccurate. For this reason, in order to prevent heating from being stopped in an uncured state, it was necessary to set the heating time longer. Therefore, there is a problem that useless heating is performed and the time required for heat curing is increased.

  To solve this problem. A technique for directly detecting the internal temperature by a current flowing through a coil has been considered. For example, in Patent Document 1, the average temperature of the coil is detected from the relationship between the voltage and current by using a DC power source. In Patent Document 2, the AC current is supplied and the coil is detected from the phase difference of the voltage current. It is shown that the temperature is detected by obtaining the resistance value.

Japanese Patent No. 2736162 Japanese Patent No. 2825368

  However, in Patent Document 1, although it is possible to know the coil temperature from the voltage and current of the AC power source, the obtained resistance value includes losses such as magnetic circuit and eddy current loss. It is necessary to allow for errors in measurement. In addition, when AC is used as the energizing power source, it is necessary to supply the reactive power generated by the coil, and it is necessary to increase the power source capacity.

  On the other hand, in Patent Document 2, when a direct current is used for the energization power source of the coil, the direct current resistance of the circuit can be calculated from the relationship between the voltage and current, and the above problem is solved for the temperature detection. Since the curing reaction is a chemical reaction, a DC power source in which the exchange of electrons is unidirectional may cause a curing abnormality.

  The present invention has been made in view of the above circumstances, and its purpose is to accurately detect the temperature of the resin while avoiding problems caused by direct current application to the coil, and an appropriate heating time. An object of the present invention is to provide a method for electrically curing a mold coil and an apparatus for electrically curing a mold coil, which can be cured by the above method.

  The method of energizing and curing a molded coil according to claim 1 includes: placing the coil in a mold; injecting the resin into the mold; and energizing the coil to generate heat, thereby heating and curing the resin. In the energization hardening method of the mold coil, an intermediate lead is provided in the coil to form a plurality of split coils, and a current path is formed so that the generated magnetic fluxes cancel each other with respect to the plurality of split coils. The resin is heated and cured by applying the AC current to the current path, the AC current to the current path is temporarily switched to DC current, and the resistance value is determined by detecting the applied voltage and current to the coil. It is characterized in that it calculates and detects the temperature of the resin to determine the completion of curing of the resin.

  According to the above invention, when AC current is applied to the coil, the resin can be heated without causing a curing abnormality of the resin as in the case of heating by DC current, and the coil is provided with an intermediate lead to a plurality of divided coils. On the other hand, the total inductance of the coil can be reduced by energizing the magnetic flux generated during alternating current energization so that the divided coils cancel each other. Thereby, generation | occurrence | production of the reactive current which does not contribute to heat_generation | fever at the time of alternating current supply can also be suppressed. Then, the resin temperature can be indirectly detected by calculating the resistance value of the coil from the voltage applied to the coil and the current flowing temporarily during the heating of the resin by the AC current. . In this case, since the resistance value is detected by DC energization, the error can be reduced and the temperature can be detected with high accuracy. As a result, the completion of the resin curing can be determined, so that AC energization is stopped at an appropriate timing. be able to.

  The method of energizing and curing a molded coil according to claim 2 includes: placing the coil in a mold; injecting the resin into the mold; and energizing the coil to generate heat, thereby heating and curing the resin. In the method of energizing and curing a molded coil, an energization path is formed so that the generated magnetic fluxes cancel each other for a plurality of the coils, and the resin is heated and cured by applying the alternating current to the energization path. , Temporarily switching the AC energization to the energization path to DC energization, detecting the applied voltage and energization current to the coil, calculating the resistance value, detecting the temperature of the resin, and curing the resin It has a feature in judging completion.

  According to the above invention, as in the first aspect of the invention, when an AC current is applied to the coil, the resin can be heated without causing a curing abnormality of the resin as in the case of heating by a DC current, and a plurality of By energizing the coils such that magnetic fluxes generated during AC energization cancel each other out, the total inductance of the coils can be reduced. As a result, the same effect as that of the invention of claim 1 can be obtained.

  In the method of energizing and curing a molded coil according to claims 3 and 4, in the case of the configuration of a plurality of divided coils and the configuration of a plurality of coils which are the objects of claims 1 and 2, the resin is cured. As the AC energization applied at the time, an energization path is formed so that the generated magnetic fluxes cancel each other with respect to the plurality of divided coils or the plurality of coils, and a rectangular wave is formed in the energization path as the AC energization. The resin is heated and cured by energizing from an AC power supply capable of energizing an AC current, and when the rectangular wave AC current is energized by the AC power supply, the resistance value of the coil is determined from the energization current of the half-wave DC section. It is characterized in that it calculates, detects the temperature of the resin from the calculated resistance value, and determines the completion of curing of the resin.

  According to the above invention, by making the energizing current an AC rectangular wave, the temperature is accurately obtained by obtaining the DC resistance from the relationship corresponding to the DC energization of the voltage current immediately before the inversion of the rectangular wave, and by the DC energizing Abnormal curing of the resin can be prevented. This also makes it possible to cure the resin and measure the temperature with a single AC power source.

  According to the present invention, it is possible to accurately detect the temperature of the resin while performing curing with an appropriate heating time while avoiding problems caused by direct current by curing the resin with alternating current. become able to.

The connection aspect figure of the electric current hardening method which shows the 1st Embodiment of this invention Block diagram of the electric curing device The connection aspect figure of the electric current hardening method which shows the 2nd Embodiment of this invention. Connection aspect diagram of the electric current curing method showing the third embodiment of the present invention Connection aspect diagram of an electro-curing device showing a fourth embodiment of the present invention. The block block diagram of the electric curing apparatus which shows the 5th Embodiment of this invention. Diagram showing energization waveform of rectangular wave energization The block block diagram of the electric curing apparatus which shows the 6th Embodiment of this invention.

(First embodiment)
A first embodiment of the present invention will be described below with reference to FIG. 1 and FIG.
FIG. 1 shows a part of a longitudinal section including the central axis of a cylindrical resin molded coil 1 and shows a connection form in the case of conducting current curing. In FIG. 1, the resin-molded coil 1 is formed in a substantially cylindrical shape or a substantially rectangular tube shape as a whole, and its center hole is fitted to the iron core leg of the transformer or the iron core of the reactor which is a stationary induction device. Combined.

  The resin mold coil 1 is formed by molding the entire coil 3 formed by arranging, for example, four unit coils 2a to 2d having an annular shape in the axial direction with a thermosetting insulating resin such as a resin. Is formed. The unit coils 2a to 2d are formed by winding a wire 5 formed by covering with an insulator in a ring in the same direction.

  The resin-molded coil 1 is provided with coil terminals 1a and 1b at both ends, that is, at the beginning and end of winding of the coil, and an intermediate point where the two unit coils 2b and 2c are connected, that is, the total number of turns 1 A coil terminal 1c serving as an intermediate lead is led out from the portion / 2. Thereby, the coil 3 will be in the state comprised by the division | segmentation coil which consists of unit coils 2a and 2b, and the division | segmentation coil which consists of unit coils 2c and 2d.

  In the step of forming the mold layer 4, as shown in the figure, in order to cure the resin injected into the mold, the coil 3 is energized by the heating power source 6 to generate heat by the resistance component and heat the resin. In this case, the heating power source 6 functions as an electric current curing device (AC power source device), and its power terminal 6 a is commonly connected to the coil terminals 1 a and 1 b of the coil 3, and the power terminal 6 b is the coil terminal 1 c of the coil 3. Connected to.

  Thereby, the alternating current supplied to the coil 3 from the heating power supply 6 is supplied to the unit coils 2a and 2b from the power supply terminal 6a via the coil terminal 1a, and the current supply path in the direction from the coil terminal 1c to the power supply terminal 6b. At the same time, the unit coils 2d and 2c are energized from the power supply terminal 6a via the coil terminal 1b, and then flow in the energization path extending from the coil terminal 1c to the power supply terminal 6b. At this time, since the magnetic field is generated so that the direction of the current flowing through the unit coils 2a and 2b and the direction of the current flowing through the unit coils 2d and 2c cancel each other, the overall reactance of the coil 3 becomes small. As a result, an AC power source is used as the heating power source 6, but the amount of reactive power to be supplied can be reduced in the AC energization state to the coil 3.

  FIG. 2 shows an internal block configuration of the heating power source 6. The heating power source 6 is mainly composed of an AC power source 7 as an AC power source device, a DC power source 8 as a DC power source device, and a power source control unit 9. . The AC power supply 7 is connected to the power supply terminals 6 a and 6 b via the power supply switching unit 10. The DC power supply 8 is connected to the power supply terminals 6 a and 6 b via the voltage / current sensor 11 and the power supply switching unit 10. The voltage / current sensor 11 detects the applied voltage and energization current from the DC power supply 8, and outputs a detected temperature signal to the power supply control unit 9 via the temperature calculation unit 12. The voltage / current sensor 11 and the temperature calculation unit 12 constitute a temperature measuring device. The power supply control unit 9 performs energization control to the AC power supply 7 and the DC power supply 8 as described later, and performs switching control of the power supply switching unit 10 based on the detected temperature signal from the temperature calculation unit 12.

  Next, the process of forming the mold layer 4 by curing the resin injected into the mold in the manufacturing process of the resin mold coil 1 will be described. Here, as shown in FIG. 1, the coil 3 is energized by a heating power source 6 to generate heat by Joule heat generated by the resistance component of the coil 3 to heat the resin. The power source control unit 9 of the heating power source 6 performs switching control of the power source switching unit 10 so that the AC power source 7 side is output to the power source terminals 6a and 6b so that the AC power source 7 is energized first. The resin is heated by controlling the energization of the AC power supply 7 so that the temperature of the resin becomes a predetermined temperature. When the temperature reaches the predetermined temperature, the state is continued for a predetermined time. For example, the resin is cured by heating to 100 ° C. and continuing for a predetermined time.

  At this time, in order to determine whether or not the temperature of the resin has reached a predetermined temperature, the power supply control unit 9 switches the power supply switching unit 10 to the DC power supply 8 side and applies DC power to the coil 3. Since the temperature of the coil 3 is equal to the temperature of the resin, the temperature can be detected if the resistance value of the coil 3 can be detected. The resistance value of the coil 3 can be obtained based on the result of detecting the voltage applied by the DC power supply 8 and the energization current by the voltage / current sensor 11. Then, since the obtained resistance value of the coil 3 and the temperature are correlated, the temperature calculation unit 12 performs a calculation process to detect the temperature of the resin.

  When the temperature detection operation is completed, the power supply control unit 9 switches the power supply switching unit 10 to the AC power supply 7 side again and performs AC energization to the coil 3. Thereafter, switching control of the power supply switching unit 10 is performed at an appropriate timing to determine whether the temperature of the resin is maintained at a predetermined temperature. And when predetermined time passes, the power supply control part 9 will stop the electricity supply to the coil 3, and will complete | finish a heating operation.

  Thereafter, the mold layer 4 is released and cooled for a predetermined time, and the curing step by heating the resin is completed, whereby the mold layer 4 is formed. In the case described above, the heating time and the cooling time are set appropriately by setting the heating temperature.

  According to the first embodiment as described above, in the curing step by heating the resin, AC heating is performed from the heating power source 6 to the coil 3 and resistance heating is performed. Can be avoided. Further, in this case, since the energization to the unit coils 2a and 2b and the energization to the unit coils 2c and 2d are opposite to each other, the generated magnetic field acts so as to cancel each other and the inductance can be reduced. The generation of reactive power can be suppressed. Furthermore, when the temperature of the resin is detected, the power source switching unit 10 of the heating power source 6 is switched to energization by the DC power source 8, so that the resistance value is calculated from the voltage applied to the coil 3 and the energization current, and the resin at that time The temperature can be accurately detected. Thereby, the stop timing of alternating current energization can be judged accurately and heating without excess or deficiency can be performed.

  In the above embodiment, in the resin curing process by AC energization to the coil 3, the resin curing determination is performed and AC energization is stopped. However, before the resin is sufficiently cured, After the resin is cured and no abnormality occurs even after switching to DC energization, the power control unit 9 controls the power switching unit 10 by controlling the temperature or time, and the coil by the DC power source 8 is controlled. It is also possible to switch to direct current energization No. 3 and hold until the necessary heating time elapses.

(Second Embodiment)
FIG. 3 shows a second embodiment of the present invention, and only the parts different from the first embodiment will be described below. In the configuration of FIG. 3, in addition to the coil terminal 1c, a coil terminal 1d as an intermediate terminal is led out to a connecting portion between the unit coils 2a and 2b which has been divided coils, and an intermediate terminal is connected to a connecting portion between the unit coils 2c and 2d. The coil terminal 1e is derived. Thereby, each of the four unit coils 2a-2d functions as a divided coil.
The power supply terminal 6a of the heating power supply 6 is commonly connected to the coil terminal 1c in addition to the coil terminals 1a and 1b of the coil 3, and the power supply terminal 6b is commonly connected to the coil terminals 1d and b1e of the coil 3.

  Thereby, in the process of heating the resin, the direction in which the alternating current supplied to the coil 3 from the heating power source 6 flows through the unit coils 2a and 2c is opposite to the direction through which the unit coils 2b and 2d flow. Magnetic fields generated as a result of alternating current passing through the unit coils 2a to 2d cancel each other between adjacent unit coils. As a result, as in the first embodiment, the overall reactance of the coil 3 is reduced, and heating is performed by applying alternating current from the heating power supply 6, but the reactive power in the coil 3 can be reduced. .

(Third embodiment)
FIG. 4 shows a third embodiment of the present invention. This embodiment is applied to a resin molded coil 14 with a switching tap instead of the resin molded coil 1 having four unit coils 2a to 2d. is there. The coil 15 constituting the resin mold coil 14 has a configuration in which two divided coils 15a and 15b having the same number of turns are connected in series.

  In the illustrated state, the split coils 15a and 15b are indicated by electrical symbols. However, in reality, the entire coil 15 formed by arranging two annular split coils 15a and 15b in the axial direction is shown. The mold layer 4 is formed by molding with a thermosetting insulating resin such as a resin. The unit coils 2a to 2d are formed by winding a wire 5 formed by covering with an insulator in a ring in the same direction.

  The resin molded coil 14 is provided with coil terminals 14a and 14b at both ends, that is, at the beginning and end of winding of the coil. In the split coil 15a, switching terminals 14c, 14d, and 14e for switching the number of turns are led out on the side opposite to the coil terminal 14a. Further, switching terminals 14f, 14g, and 14h for switching the number of turns are led out to the split coil 15b on the opposite side to the coil terminal 14b. The number of turns that can be switched by the switching terminals 14c to 14e of the split coil 15a and the number of turns that can be switched by the switching terminals 14f to 14h of the split coil 15b are set to be equal. Moreover, at the time of use, it can set so that it may become a desired number of turns by switching so that either of the switching terminals 14c-14e and any of the switching terminals 14f-14h may be connected.

  In the step of forming the mold layer 4, the power supply terminal 6 a of the heating power supply 6 is commonly connected to the coil terminals 14 a and 14 b of the coil 15, and the power supply terminal 6 b is common to the switching terminals 14 c and 14 f of the coil 15 as shown in the figure. Connected to.

  As a result, the alternating current supplied to the coil 15 from the heating power supply 6 is supplied to the split coil 15a from the power supply terminal 6a via the coil terminal 14a, and flows through an energization path extending from the switching terminal 14c to the power supply terminal 6b. The split coil 15b is energized from the power supply terminal 6a through the coil terminal 14b, and flows through the energization path in the direction from the coil terminal 14f to the power supply terminal 6b. At this time, since the magnetic field is generated so that the direction of the current flowing through the split coil 15a and the direction of the current flowing through the split coil 15b cancel each other, the overall reactance of the coil 15 becomes small. As a result, an AC power source is used as the heating power source 6, but the amount of reactive power to be supplied can be reduced in the AC energization state to the coil 15.

  According to such 3rd Embodiment, even when applying to the resin mold coil 14 with the switching terminal which can change a winding number, it divides | segments into the two division | segmentation coils 15a and 15b, and each switching terminal 14c-14e , 14f to 14h are provided, and by connecting between the switching terminals 14c-14f at the time of heating the resin, it is possible to perform AC energization as a connection state similar to that of the first embodiment. The same effect as the embodiment can be obtained.

(Fourth embodiment)
FIG. 5 shows a fourth embodiment of the present invention. The difference from the first embodiment is that a plurality of resin molded coils 16 and 17 are heated simultaneously. The resin molded coils 16 and 17 both have substantially the same configuration as the resin molded coil 1 described in the first embodiment, but the coil terminal 1c led out between the unit coils 2b and 2c Not provided. Instead, the two resin mold coils 16 and 17 are regarded as divided coils and connected to the same configuration as that of the first embodiment.

  The resin molded coil 16 is provided with coil terminals 16a and 16b at both ends, that is, at the beginning and end of winding of the coil, and the resin molded coil 17 is similarly provided with coil terminals 17a and 17b. In the step of forming the mold layer 4, as shown in the drawing, in order to cure the resin injected into the mold, two resin mold coils 16 and 17 are arranged so as to overlap in the axial direction, and the power source of the heating power source 6 is The terminal 6a is connected in common to the coil terminal 16a of the resin mold coil 16 and the coil terminal 17b of the resin mold coil 17, and the power supply terminal 6b is common to the coil terminal 16b of the resin mold coil 16 and the coil terminal 17a of the resin mold coil 17. Connected.

  Thereby, the direction of the alternating current supplied from the heating power source 6 is reversed between the resin mold coil 16 and the resin mold coil 17, and the resin mold coils 16 and 17 generate a magnetic field so as to cancel each other. The reactance as a whole can be made smaller when two mold coils 16 and 17 are energized at the same time, and this makes it possible to reduce the amount of reactive power supplied when AC energization is performed from the heating power supply 6. It is.

  In such a fourth embodiment, the resin molded coils 16 and 17 are regarded as divided coils, respectively, and the resin is heated by simultaneously energizing them, so the same action as in the first embodiment The effect can be obtained, and it is not necessary to provide an intermediate terminal for each resin molded coil 16 or 17.

(Fifth embodiment)
FIGS. 6 and 7 show a fifth embodiment of the present invention. Hereinafter, parts different from the first embodiment will be described. In this embodiment, a heating power source 18 is provided in place of the heating power source 6. FIG. 6 shows an internal block configuration of the heating power supply 18. The heating power supply 18 is mainly composed of a rectangular wave power supply 19 and a power supply control unit 9, and a voltage for detecting an applied voltage and an energization current of the rectangular wave power supply 19. A configuration including the current sensor 11 and the temperature calculation unit 12.

  In the present embodiment, AC energization is performed by rectangular wave energization supplied by a rectangular wave power source 19. FIG. 7 shows respective waveforms of voltage and current when energizing the rectangular wave output from the rectangular wave power source 19. For example, the rectangular wave voltage changes stepwise until it reaches a positive predetermined voltage at time t1, and then holds the voltage for a certain time (T), and then stepwise until it reaches a negative predetermined voltage at time t2. This is an applied voltage pattern in which the voltage is held for a certain time (T) after the change to. The AC voltage is applied by repeating this applied voltage pattern.

  In addition, by conducting rectangular wave energization, it can be regarded as direct current energization during a certain period (T) of energization, so the applied voltage and energization current value during this period are detected by the voltage / current sensor 11 and the resistance value of the coil 3 is detected. And the temperature calculator 12 can detect the temperature of the resin. In this case, since the current value still fluctuates immediately after the voltage changes stepwise, it may be detected at a timing slightly before the next step change.

According to the fifth embodiment, since the heating power supply 18 is provided with the rectangular wave power supply 19, the rectangular wave power supply is performed as the AC power supply, and the resin is cured by heating with the coil 3. By conducting the wave energization, the value of the energization current can also be detected at the same time, so that the temperature of the resin can be accurately detected from the resistance value of the coil 3.
In this embodiment, the coil 3 used in the first embodiment has been described as a heating target. However, the present invention can be applied to any of the second to fourth embodiments.

(Sixth embodiment)
FIG. 8 shows a sixth embodiment of the present invention. The difference from the fifth embodiment is that a heating power source 20 is provided instead of the heating power source 18. The heating power source 20 has a configuration in which a DC power source 8 and a power source switching unit 10 are added so that direct current energization is possible in addition to the configuration of energization by the rectangular wave power source 19 of the heating power source 18.

  In this embodiment, the structure which performs the heating by the direct current energization performed after the alternating current energization in the first embodiment is added. As described above, the rectangular wave power supply 19 performs rectangular wave energization to determine the curing of the resin and stops the rectangular wave energization. However, even if the resin is switched to DC energization before the resin is fully cured, After a state where no hardening abnormality occurs, the temperature or time is managed, and the power source control unit 9 controls the power source switching unit 10 to switch to the DC power supply to the coil 3 by the DC power source 8. In this way, it is held until the necessary heating time elapses.

(Other embodiments)
The present invention is not limited to the above embodiment, and for example, the following modifications or expansions are possible.
Although it applied to the thing provided with the four unit coils 2a-2d as the coil 3, if the number of unit coils is two or more, it will not be limited. In this case, if the unit coils have the same number of turns, the coil terminals can be derived so as to be in reverse parallel and the AC current can be supplied. Even in the case of an odd number, the same effect can be obtained if the total number of turns of the coils connected in antiparallel is made equal.

Even when the resin is cured on a plurality of resin mold coils at the same time, the number of resin is not limited to two, and more than this can be performed simultaneously.
In rectangular wave energization, energization is performed using a rectangular wave in which the voltage changes instantaneously from negative to positive or from positive to negative, but the change is not instantaneous but changes with a slight time delay. It may be a rectangular wave having a trapezoidal shape. Any rectangular wave may be used as long as a constant voltage is maintained after the change.

  In the drawings, 1, 13, 14, 16, and 17 are resin molded coils, 1a, 1b, 14a, and 14b are coil terminals, 1c and 14a to 14h are coil terminals (intermediate lead), and 2a to 2d, 15a, and 15b are divided. Coil, 3 is a coil, 4 is a mold layer (resin), 6 and 18 are heating power supplies, 7 is an AC power supply (AC power supply apparatus), 8 is a DC power supply (DC power supply apparatus), 9 is a power supply control unit, and 11 is a voltage. A current sensor (temperature measurement device), 12 is a temperature calculation unit (temperature measurement device), and 19 is a rectangular wave power supply (AC power supply device).

Claims (8)

In the method of energizing and curing a mold coil, in which a coil is disposed in a mold, a resin is injected into the mold, and the resin is heated by AC current to generate heat, the resin is heated and cured.
A plurality of split coils are formed by providing an intermediate lead in the coil,
An energization path is formed so that the generated magnetic fluxes cancel each other with respect to the plurality of divided coils, and the resin is heated and cured by performing the alternating current energization in the energization path,
The AC energization to the energization path is temporarily switched to DC energization, the applied voltage and the energization current to the coil are detected, the resistance value is calculated, the temperature of the resin is detected, and the resin is completely cured A method for electrifying and curing a molded coil, characterized in that: In the method of energizing and curing a mold coil, in which a coil is disposed in a mold, a resin is injected into the mold, and the resin is heated by AC current to generate heat, the resin is heated and cured.
An energization path is formed so that the generated magnetic fluxes cancel each other with respect to the plurality of coils, and the resin is heated and cured by performing the alternating current energization in the energization path,
The AC energization to the energization path is temporarily switched to DC energization, the applied voltage and the energization current to the coil are detected, the resistance value is calculated, the temperature of the resin is detected, and the resin is completely cured A method for electrifying and curing a molded coil, characterized in that: In the method of energizing and curing a mold coil, in which a coil is disposed in a mold, a resin is injected into the mold, and the resin is heated by AC current to generate heat, the resin is heated and cured.
A plurality of split coils are formed by providing an intermediate lead in the coil,
An energization path is formed so that the generated magnetic fluxes cancel each other with respect to the plurality of divided coils, and energization is performed from an AC power supply apparatus capable of energizing an AC current having a rectangular wave shape as the AC energization to the energization path And heat curing the resin,
At the time of energization of the rectangular-wave AC current by the AC power supply device, the resistance value of the coil is calculated from the energization current of the half-wave DC section, the temperature of the resin is detected from the calculated resistance value, and the resin is cured. A method for electrifying and curing a molded coil, wherein completion is determined. In the method of energizing and curing a mold coil, in which a coil is disposed in a mold, a resin is injected into the mold, and the resin is heated by AC current to generate heat, the resin is heated and cured.
An energization path is formed so that the generated magnetic fluxes cancel each other with respect to the plurality of coils, and the energization path is energized from an AC power supply device capable of energizing an alternating current having a rectangular wave shape as the AC energization. And heat curing the resin,
At the time of energization of the rectangular-wave AC current by the AC power supply device, the resistance value of the coil is calculated from the energization current of the half-wave DC section, the temperature of the resin is detected from the calculated resistance value, and the resin is cured. A method for electrifying and curing a molded coil, wherein completion is determined. In the electric current hardening apparatus of the mold coil for enforcing the electric heating method of the mold coil according to claim 1 or 2,
An alternating current power supply for energizing the alternating current;
A direct current power supply device that performs direct current conduction to the coil for a predetermined time during the alternating current conduction by the alternating current power supply device;
A mold coil energizing and curing device comprising: a temperature measuring device that measures a DC resistance of the coil from a DC current value when energized by the DC power supply device and thereby detects a temperature of the resin. In the electric current hardening apparatus of the mold coil according to claim 5,
After the resin in at least the terminal portion for energizing the coil is cured by the rectangular wave-shaped AC energization to the coil, the AC energization is stopped and switched to DC energization to the coil by the DC power supply device. An electric curing device for the mold coil. In the electric current hardening apparatus of the mold coil for implementing the electric current hardening method of the mold coil of Claim 3 or 4,
An AC power supply device capable of energizing an AC current having a rectangular wave shape;
A temperature measuring device that calculates a resistance value of the coil from an energizing current of a half-wave direct current section when energizing the rectangular wave AC current by the AC power supply device, and detects a temperature of the resin from the calculated resistance value; An electric current curing apparatus for a molded coil. In the electric current hardening apparatus of the mold coil according to claim 7,
A direct current power supply device for direct current to the coil;
After the resin in at least the terminal portion for energizing the coil is cured by the rectangular wave-shaped AC energization to the coil, the AC energization is stopped and switched to DC energization to the coil by the DC power supply device. An electric curing device for the mold coil.

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