JP2021141676A - Stator manufacturing apparatus and stator manufacturing method - Google Patents

Abstract

To enable manufacturing of a stator without separately providing a heating source such as a heater.SOLUTION: A stator manufacturing apparatus (1) is provided with: a variable voltage variable frequency power supply (15) for flowing electric current to a stator coil (12) to heat a thermosetting resin (13) charged into a stator coil end (121), and a stator slot (111) of a stator core (11); and a resin restraint (14) being a guide for impregnating the inside of the stator coil end (121) and the stator slot (111) with the thermosetting resin (13).SELECTED DRAWING: Figure 1A

Description

The present invention relates to a stator manufacturing apparatus and a stator manufacturing method.

Conventionally, a stator is impregnated with an insulating varnish by an immersion impregnation method or a dropping impregnation method in a stator coil, or a stator core provided with a stator coil is arranged in a mold, and then a mold resin composition is injected into the mold. It is manufactured by varnishing.

Further, in Patent Document 1, the electromagnetic coil is impregnated with a mixture of a powdery filler and a volatile solvent, the volatile solvent is evaporated by heating, and then the electromagnetic coil is impregnated with a thermosetting resin. A method of curing a thermosetting resin by heating is disclosed.

Japanese Unexamined Patent Publication No. 11-136911

However, when the thermosetting resin is cured by the method described in Patent Document 1, it is necessary to separately provide a heating source such as a heater, and it is necessary to install a heater every time the thermosetting resin is filled. ..

An object of the present invention made in view of such circumstances is to provide a stator manufacturing apparatus and a stator manufacturing method capable of manufacturing a stator without separately providing a heating source such as a heater.

The stator manufacturing apparatus according to one embodiment includes a variable voltage variable frequency power supply for heating a thermosetting resin filled in a status lot of a stator coil end and a stator core by passing an electric current through a data coil, and the thermosetting property. It is provided with a resin retainer which is a guide for allowing the resin to permeate the inside of the stator coil end and the status lot.

Further, in one embodiment, the variable voltage variable frequency power supply may heat the thermosetting resin by generating heat from the stator coil, the stator core, and the resin retainer.

Further, in one embodiment, a heat insulating material installed around the thermosetting resin may be further provided.

Further, in one embodiment, a temperature detector for detecting the temperature of the thermosetting resin is further provided, and the variable voltage variable frequency power supply is made of the thermosetting resin based on the temperature detected by the temperature detector. Temperature control may be performed.

Further, in one embodiment, the temperature detector may be installed adjacent to the resin retainer.

The stator manufacturing method according to one embodiment includes a step of filling the status lot of the stator coil end and the stator core with a thermosetting resin, and passing a current through the stator coil by a variable voltage variable frequency power supply to obtain the thermosetting property. It includes a heating step of heating the resin and a step of stopping the output of the variable voltage variable frequency power supply when the thermosetting resin is cured.

Further, in one embodiment, the step of installing a resin retainer which is a guide for infiltrating the thermosetting resin into the stator coil end and the status lot is further included, and the heating step includes the stator coil. The thermosetting resin may be heated by generating heat from the stator core and the resin retainer.

Further, in one embodiment, a step of installing a heat insulating material around the thermosetting resin may be further included.

Further, in one embodiment, a temperature detection step for detecting the temperature of the thermosetting resin is further included, and the heating step controls the temperature of the thermosetting resin based on the temperature detected by the temperature detection step. You may do it.

According to the present invention, it is possible to manufacture a stator without separately providing a heating source such as a heater.

It is a figure which shows the structural example of the stator manufacturing apparatus which concerns on 1st Embodiment. It is a figure which shows the structural example of the stator manufacturing apparatus which concerns on 1st Embodiment. It is a flowchart which shows the procedure example of the stator manufacturing method which concerns on 1st Embodiment. It is a figure which shows the structural example of the stator manufacturing apparatus which concerns on 2nd Embodiment. It is a figure which shows the structural example of the stator manufacturing apparatus which concerns on 2nd Embodiment. It is a flowchart which shows the procedure example of the stator manufacturing method which concerns on 2nd Embodiment.

Hereinafter, one embodiment will be described in detail with reference to the drawings.

(First Embodiment)
The stator manufacturing apparatus according to the first embodiment will be described with reference to FIG. FIG. 1A shows a semi-cross-sectional view of the stator manufacturing apparatus as seen from the y direction, and FIG. 1B shows a cross-sectional view of the stator manufacturing apparatus as viewed from the x direction. The stator manufacturing apparatus 1 shown in FIG. 1 includes a stator frame 10, a stator core (stator core) 11, a stator coil (stator winding) 12, a thermosetting resin 13, a resin restraint 14, and a VVVF power supply (variable voltage). (Variable frequency power supply) 15 and the like.

The stator frame 10 houses the stator core 11, the stator coil 12, the thermosetting resin 13, and the resin restraint 14. The stator frame 10 has fins 101.

The stator core 11 is composed of a laminated core and has a plurality of status lots 111 into which windings are inserted.

The stator coil 12 is a conductor such as copper wound around the status lot 111 of the stator core 11, and has a resistance component and an inductance component. When the stator coil 12 is wound from the status lot 111 to another status lot 111 or wound to the same status lot 111 a plurality of times, the stator coil 12 has a stator coil end 121 protruding from the stator core 11. It will exist.

The thermosetting resin 13 is a resin that cures at a predetermined temperature and has insulating properties.

The resin retainer 14 is a guide for allowing the thermosetting resin 13 to permeate (fill) the inside of the stator coil end 121 and the status lot 111, and is made of a metal (for example, aluminum). The resin retainer 14 is installed adjacent to the inside of the stator core 11.

The VVVF (Variable Voltage Variable Frequency) power supply 15 is a power supply device (for example, an inverter) capable of arbitrarily changing the magnitude and frequency of the voltage, and is connected to the lead wire of the stator coil 12. The VVVF power supply 15 applies a voltage to the stator coil 12 to pass a current through the stator coil 12. When a current flows through the stator coil 12 having a resistance component, the stator coil 12 generates heat due to copper loss, and the heat generation can heat the thermosetting resin 13. Therefore, the VVVF power supply 15 heats the thermosetting resin 13 by passing an electric current through the stator coil 12. The VVVF power supply 15 adjusts the amount of current flowing through the stator coil 12 by changing the voltage or frequency.

Further, the VVVF power supply 15 causes iron loss in the stator core 11 and the resin restraint 14 made of metal by adjusting the frequency, and indirectly generates heat in the stator core 11 and the resin restraint 14. Therefore, the stator core 11 and the resin restraint 14 also contribute to heating the thermosetting resin 13. For example, the output frequency of the VVVF power supply 15 is set to a high frequency within an applicable range in consideration of the voltage drop due to the inductance of the stator core 11 and the resin retainer 14. For example, the frequency is set to about 5 to 20 times the rated frequency of the motor manufactured by using the stator (if the rated frequency of the motor is 60 Hz, the frequency is 300 to 1200 Hz).

Next, the procedure of the stator manufacturing method according to the first embodiment will be described with reference to FIG.

In step S101, the resin retainer 14 is installed adjacent to the inside of the stator core 11.

In step S102, the VVVF power supply 15 is connected to the lead wire of the stator coil 12.

In step S103, the thermosetting resin 13 is preheated to a predetermined temperature (for example, around 70 ° C.) so that the thermosetting resin 13 can be filled in step S104. Then, in order to prevent the preheated thermosetting resin 13 from cooling, a voltage is applied by the VVVF power supply 15 to preheat the stator (stator coil 12 and the stator core 11) to a predetermined temperature (for example, around 100 ° C.). do.

In step S104, the inside of the stator coil end 112 and the status lot 111 is filled with the thermosetting resin 13.

In step S105, a current is passed through the stator coil 12 by the VVVF power supply 15 to heat the thermosetting resin 13, and the voltage and frequency of the VVVF power supply 15 are maintained so that the thermosetting resin 13 maintains a predetermined temperature for a predetermined time. Adjust at least one of them. For example, the thermosetting resin is reacted at 100 ° C. for 1 hour and then maintained at 150 ° C. for 3 hours to cure the thermosetting resin. In step S104, the stator core 11 and the resin retainer 14 may be indirectly generated by the VVVF power supply 15.

In step S106, it is determined whether or not the thermosetting resin 13 has been cured. For example, it can be determined whether or not the thermosetting resin 13 has been cured based on the temperature or the calorific value of the thermosetting resin 13. When the thermosetting resin 13 is cured, the process proceeds to step S106.

In step S107, the output of the VVVF power supply 15 is stopped.

In step S108, the VVVF power supply 15 is removed.

In step S109, the resin retainer 14 is removed.

As described above, in the first embodiment, since the thermosetting resin 13 is heated by using the VVVF power supply 15, it is possible to manufacture the stator without separately providing a heating source such as a heater.

(Second Embodiment)
Next, the stator manufacturing apparatus according to the second embodiment will be described with reference to FIG. FIG. 3A shows a semi-cross-sectional view of the stator manufacturing apparatus as seen from the y direction, and FIG. 3B shows a cross-sectional view of the stator manufacturing apparatus as viewed from the x direction. The stator manufacturing apparatus 2 shown in FIG. 3 includes a stator frame 10, a stator core 11, a stator coil 12, a thermosetting resin 13, a resin suppressor 14, a VVVF power supply 15, a temperature detector 16, and a plurality of the stator manufacturing devices 2. A heat insulating material 17 is provided. The stator manufacturing apparatus 2 of the second embodiment is different from the stator manufacturing apparatus 1 of the first embodiment in that the temperature detector 16 and the plurality of heat insulating materials 17 are further provided. Since the other configurations are the same as those in the first embodiment, the same reference numbers are assigned and the description thereof will be omitted as appropriate.

The heat insulating material 17 is heat-insulated in order to suppress changes in the thermosetting resin 13 and its ambient temperature due to the outside air. The heat insulating material 17 is installed around the thermosetting resin 13 (between the thermosetting resin 13 and the outside air). For example, the heat insulating material 17-1 is installed so as to cover the periphery of the stator frame 10, and the heat insulating material 17-2 and the heat insulating material 17-3 are installed at both ends of the stator frame 10. Further, the heat insulating material 17-4 may be further installed inside the resin restraint 14. The installation position of the heat insulating material 17 is not limited to this.

The temperature detector 16 detects the temperature of the thermosetting resin 13 and notifies the VVVF power supply 15 of the detected temperature. The temperature detector 16 may be a non-contact temperature detector such as a thermography. The VVVF power supply 15 adjusts the amount of current by changing at least one of the voltage and the frequency based on the temperature detected by the temperature detector 16, and controls the temperature of the thermosetting resin 13. For example, regarding the preheating of the stator coil 12 before filling the thermosetting resin 13, the temperature of the stator coil 12 is controlled to 100 ° C., and after the thermosetting resin 13 is filled, the thermosetting resin 13 is used. After controlling the temperature so as to maintain 100 ° C. for 1 hour, the temperature of the thermosetting resin 13 is controlled so as to maintain 150 ° C. for 3 hours.

Alternatively, a PTC (positive temperature coefficient) thermistor is provided in the stator coil 12, and when the heat resistant temperature of the stator coil 12 is reached, the output of the VVVF power supply 15 is stopped, and when the temperature falls below the heat resistant temperature of the stator coil 12, the output of the VVVF power supply 15 is output. You may try to resume.

The temperature detector 16 is installed near the thermosetting resin 13 and the resin retainer 14. In the example shown in FIG. 3, the temperature detector 16 is installed adjacent to the resin retainer 14 and between the heat insulating material 17-4.

Next, the procedure of the stator manufacturing method according to the second embodiment will be described with reference to FIG.

In step S201, the resin retainer 14 is installed adjacent to the inside of the stator core 11. Further, a heat insulating material 17 is installed around the thermosetting resin 13, and a temperature detector 16 is installed near the thermosetting resin 13 and the resin restraint 14. Steps S202 to S204 are the same as steps S102 to S104 described in the first embodiment.

In step S205, a current is passed through the stator coil 12 by the VVVF power supply 15 to heat the thermosetting resin 13. The VVVF power supply 15 controls the temperature of the thermosetting resin 13 by using the temperature detector 16. Steps S206 to S208 are the same as steps S106 to S108 described in the first embodiment.

In step S209, the resin retainer 14, the temperature detector 16, and the heat insulating material 17 are removed.

As described above, in the second embodiment, since the heat insulating material 17 is installed around the thermosetting resin 13, the thermosetting resin 13, the stator core 11, the stator coil 12, and the resin restraint 14 are installed. It is possible to reduce the influence of the outside air on the temperature of.

Further, in the second embodiment, since the temperature of the thermosetting resin 13 is measured by the temperature detector 16, the VVVF power supply 15 can control the temperature of the thermosetting resin 13 with high accuracy.

Although the above embodiments have been described as representative examples, it will be apparent to those skilled in the art that many modifications and substitutions can be made within the spirit and scope of the present disclosure. Therefore, the present invention should not be construed as being limited by the embodiments described above, and various modifications or modifications can be made without departing from the claims. For example, the stator manufacturing apparatus 1 of the first embodiment may include the temperature detector 16 or the heat insulating material 17 described in the second embodiment. Further, it is possible to combine the plurality of steps described above into one, or to divide one step.

1, 2, stator manufacturing equipment 10 stator frame 11 stator core 12 stator coil 13 thermosetting resin 14 resin suppressor 15 VVVF power supply 16 temperature detector 17 heat insulating material 101 fin 111 status lot 121 stator coil end

Claims (9)

A variable voltage variable frequency power supply that heats the thermosetting resin filled in the status lot of the stator coil end and the status iron core by passing an electric current through the stator coil.
A resin closer that is a guide for allowing the thermosetting resin to penetrate into the stator coil end and the status lot.
A stator manufacturing device. The stator manufacturing apparatus according to claim 1, wherein the variable voltage variable frequency power supply heats the thermosetting resin by generating heat from the stator coil, the stator core, and the resin retainer. The stator manufacturing apparatus according to claim 1 or 2, further comprising a heat insulating material installed around the thermosetting resin. A temperature detector for detecting the temperature of the thermosetting resin is further provided.
The stator manufacturing apparatus according to any one of claims 1 to 3, wherein the variable voltage variable frequency power supply controls the temperature of the thermosetting resin based on the temperature detected by the temperature detector. The stator manufacturing apparatus according to claim 4, wherein the temperature detector is installed adjacent to the resin retainer. The step of filling the status lot of the stator coil end and the stator core with thermosetting resin,
A heating step in which a current is passed through the stator coil by a variable voltage variable frequency power supply to heat the thermosetting resin, and
When the thermosetting resin is cured, the step of stopping the output of the variable voltage variable frequency power supply and
A stator manufacturing method, including. Further including the step of installing a resin retainer which is a guide for infiltrating the thermosetting resin into the stator coil end and the status lot.
The stator manufacturing method according to claim 6, wherein the heating step heats the thermosetting resin by generating heat from the stator coil, the stator core, and the resin closer. The stator manufacturing method according to claim 6 or 7, further comprising a step of installing a heat insulating material around the thermosetting resin. A temperature detection step for detecting the temperature of the thermosetting resin is further included.
The stator manufacturing method according to any one of claims 6 to 8, wherein the heating step controls the temperature of the thermosetting resin based on the temperature detected by the temperature detection step.

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