JP2021112042A - Power supply system in mold molding line of stator for motor - Google Patents

Abstract

To alleviate troublesomeness of connection work and disconnection work of a coil 13 and an AC power supply 21 in a mold molding line ML of a stator for a motor and to eliminate energy loss at the time of transportation to a resin injection station after preheating processing at a preheating station PHS.SOLUTION: A power supply system ES 1 includes a power transmission unit 2 having the AC power supply 21, and a power reception unit 3. The power transmission unit 2 is installed in both of the preheating station PHS and a resin curing station RCS. In the power transmission unit 2, the AC power supply 21 and a power transmission coil 23 are connected in series via a power transmission resonance capacitor 22 to form a power transmission closed circuit CC1. In the power reception unit 3, a power reception coil 31 and a power reception resonance capacitor 32 are connected in series, and the power reception coil 31 is connected in series to the coil 13 via the power reception resonance capacitor 32, thereby enabling a power receiving closed circuit CC2 to be formed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power feeding system used in a molding line of a motor stator that molds a motor stator with an insulating resin.

In molding of a stator for a motor, in general, a coil is wound around a plurality of slots provided at intervals in the inner peripheral portion of a core formed by laminating a plurality of annular electromagnetic steel sheets, and the electrical steel sheet is molded. The stacking direction is the Z-axis direction, and a tubular frame that is long in the Z-axis direction fits into the core, and extends outward from the long body in the Z-axis direction and the lower end of the body in the Z-axis direction. An assembly in which a body of a mold having a molded flange is inserted into a core and a cavity is formed between the mold and the core and a frame is used as an assembly to be processed, and a mold is formed on the object to be processed. Preheat treatment, resin injection treatment, and resin hardening treatment are sequentially performed on the molding line.

The preheat treatment is a process in which AC power is applied to the coil of the object to be treated to generate heat to preheat the object to be processed, and the resin injection process is a liquid thermosetting property in the cavity of the object to be treated after the preheat treatment. This is a process of injecting an insulating resin made of resin. The resin curing treatment is a process in which AC power is again applied to the coil of the object to be processed after the resin injection process to generate heat to heat the object to be processed and cure the insulating resin.

Conventionally, in the preheat treatment and the resin hardening treatment, an AC power supply is connected to the terminal of the coil of the object to be processed to supply an AC current to the coil (see, for example, Patent Document 1).

By the way, in the molding line for molding the stator for a motor, the preheat treatment, the resin injection treatment, and the resin curing treatment are performed at the preheating station, the resin injection station, and the resin curing station, respectively, so that the object to be treated is preheated. The station, the resin injection station, and the resin curing station are transported in this order.

Therefore, when the preheating station performs the connection work of connecting the coil terminal of the object to be processed and the AC power supply, and the object to be processed is transported to the resin injection station after the preheat treatment, the terminal of the coil of the object to be processed is AC. It is necessary to perform the disconnection work to disconnect from the power supply. The connection work also needs to be performed at the resin curing station. Therefore, the connection work between the coil terminal of the object to be processed and the AC power supply must be performed once for each object to be processed, once at both the preheating station and the resin curing station, and for convenience of two times. There is annoyance that the connection disconnection work must be performed after the heat treatment. Further, if the connection between the coil terminal of the object to be processed and the AC power supply is not promptly disconnected at the preheating station after the preheat treatment, the temperature of the object to be processed drops, which causes a problem of energy loss.

Japanese Unexamined Patent Publication No. 2008-72825

In view of the above points, the present invention reduces the troublesomeness of connecting and disconnecting the coil of the object to be processed and the AC power supply when molding the stator for the motor on the molding line, and also reduces the troublesomeness of the preheating station. It is an object of the present invention to provide a power feeding system in a molding line of a stator for a motor, which can eliminate energy loss during transportation to a resin injection station after preheat treatment in.

In order to solve the above problems, in the present invention, a coil is wound in a plurality of slots provided at intervals in the inner peripheral portion of a core formed by laminating a plurality of annular electromagnetic steel plates. With the stacking direction of the electromagnetic steel plates in the Z-axis direction, a tubular frame that is long in the Z-axis direction fits outside the core, and the body is long in the Z-axis direction and the lower end of the body in the Z-axis direction is outward. An assembly in which a body of a mold having an extended flange is inserted into a core and a cavity is formed between the mold and the core and the frame is used as an assembly to be processed. The preheating station for preheating, the resin injection station for injecting the insulating resin into the cavity of the object to be treated after the preheat treatment, and the resin curing station for curing the insulating resin injected into the cavity by heating are conveyed in this order. It is a power supply system in the molding line of the stator for a motor that performs molding, and has an AC power supply, a transmission resonance capacitor, and a transmission coil in a preheating station and a resin curing station that input AC power to the coil of the object to be processed. It includes a power transmission unit and a power reception unit having a power reception coil and a power reception resonance capacitor. The power transmission unit is installed in both a preheating station and a resin curing station. In the power receiving section, the power receiving coil and the power receiving resonance capacitor are connected in series, and the power receiving coil is connected in series to the coil of the object to be processed via the power receiving resonance capacitor. A power receiving closed circuit can be formed by It is characterized in that the AC power of the AC power source facing each other is input to the coil of the object to be processed in a non-contact manner via the transmission coil and the power receiving coil.

According to the present invention, since the AC power of the AC power supply is input to the coil of the object to be processed in a non-contact manner via the transmission coil and the power receiving coil, the coil of the object to be processed is passed through the power receiving resonance capacitor at the preheating station. If the power receiving coil is connected in series to form a power receiving closing circuit, it is not necessary to perform the connection disconnection operation after the preheat treatment, and the AC power of the AC power supply is input to the coil of the object to be processed even at the resin curing station. Therefore, the connection work between the coil of the object to be processed and the power receiving coil only needs to be performed once at the preheating station, and it is not necessary to disconnect the coil of the object to be processed and the AC power supply after the preheat treatment. The troublesomeness of disconnection work can be reduced. Further, after the preheat treatment at the preheating station, the connection disconnection operation for disconnecting the coil of the object to be processed and the AC power supply becomes unnecessary, so that the energy loss at the time of transporting to the resin injection station can be eliminated.

In the present invention, the power receiving unit also has a rectifier and an inverter, and the power receiving coil is connected in series with the coil of the object to be processed via the rectifier and the inverter together with the power receiving resonance capacitor to form a power receiving closing circuit. It is desirable that it can be formed. According to this, the rectifier and the inverter can efficiently input AC power from the AC power supply to the coil of the object to be processed without being affected by the self-inductance of the coil.

FIG. 5 is a cross-sectional view schematically showing a first embodiment of a power feeding system in a molding line of a stator for a motor of the present invention. FIG. 5 is a cross-sectional view schematically showing a second embodiment of a power feeding system in a molding line of a stator for a motor of the present invention.

(First Embodiment)
A first embodiment of the power feeding system in the molding line of the stator for a motor of the present invention will be described with reference to FIG. FIG. 1 shows an outline of a preheating station PHS and a resin curing station RCS provided in the molding line ML of the power feeding system ES1 of the first embodiment.

The molding line ML includes a conveying means such as a belt conveyor and a roller conveyor (not shown), and the operation of the conveying means conveys the object 1 placed on the conveying pallet P. Further, a position detection sensor (not shown) is installed in the molding line ML, and when the position detection sensor detects that the object 1 to be processed has approached the preheating station PHS and the resin curing station RCS, a detection signal is transmitted. Output to a controller (not shown). Then, when this detection signal is input, the controller stops the operation of the transport means based on the program installed in advance, and the object 1 to be processed is arranged in each of the preheating station PHS and the resin curing station RCS. NS.

The molding line ML also includes a resin injection station (not shown) for injecting an insulating resin made of a liquid thermosetting resin into the object 1 to be processed. In the molding line ML, the object 1 to be processed 1 is provided. The preheating station PHS, the resin injection station, and the resin curing station RCS are installed in this order with the transport direction as one in the X-axis direction and an interval along the one in the X-axis direction.

In the object 1 to be processed, as described above, the coil 13 is wound around a plurality of slots 12 provided at intervals in the inner peripheral portion of the core 11 formed by laminating a plurality of annular electromagnetic steel sheets. With the stacking direction of the electrical steel sheets in the Z-axis direction, a tubular frame 14 that is long in the Z-axis direction fits outside the core 11, and from the body portion that is long in the Z-axis direction and the lower end of the body portion in the Z-axis direction. A body portion of a mold mold (not shown) having a flange portion extending outward is inserted into the core 11, and a cavity (not shown) is formed between the mold mold and the core 11 and the frame 14. It is an assembly.

In the preheating station PHS, the insulating resin smoothly enters the cavity before the liquid insulating resin made of a thermosetting resin such as an epoxy resin, a phenol resin, or an unsaturated polyester resin is injected into the cavity of the object 1 to be treated. It is a station that performs preheat treatment to preheat the object 1 to be treated to an appropriate temperature such as being injected into the resin.

In the preheat treatment of the object 1 to be processed, an alternating current is supplied to the coil 13 to generate heat by applying an alternating current to the coil 13, and the heat is conducted to the core 11, the mold mold and the frame 14 (not shown). conduct. Therefore, the power supply system ES1 includes a power transmission unit 2 and a power reception unit 3. The power transmission unit 2 is installed in both the preheating station PHS and the resin curing station RCS, and has an AC power supply 21, a power transmission resonance capacitor 22, and a power transmission coil 23. In the power transmission unit 2, the AC power supply 21 and the power transmission coil 23 are connected in series via a power transmission resonance capacitor 22 to form a power transmission closing circuit CC1.

The power receiving unit 3 has a power receiving coil 31 and a power receiving resonance capacitor 32, and the power receiving coil 31 and the power receiving resonance capacitor 32 are connected in series. Further, in the power receiving unit 3, the power receiving coil 31 can be connected in series to the coil 13 of the object to be processed 1 via the power receiving resonance capacitor 32. When the power receiving coil 31 is connected in series to the coil 13 of the object to be processed 1 via the power receiving resonance capacitor 32, the power receiving closing circuit CC2 is formed.

The power receiving coil 31 is arranged below the power receiving coil 1 in the Z-axis direction, and the power transmitting coil 23 faces the power receiving coil 31 with the power receiving coil 31 on the opposite side of the power receiving coil 31. There is. Further, the power receiving unit 3 is incorporated in the transport pallet P of the object to be processed 1. That is, a flat power receiving coil 31 is provided on the lower surface of the transport pallet P in the Z-axis direction, and a power receiving resonance capacitor 32 is embedded in the upper end portion of the transport pallet P in the Z-axis direction. The wiring for connecting the power receiving coil 31 and the power receiving resonance capacitor 32 in series and the wiring for connecting the power receiving coil 31 to the coil 13 of the object to be processed 1 via the power receiving resonance capacitor 32 pass through the inside of the transport pallet P. ..

The power receiving coil 31 can be connected in series to the coil 13 of the object to be processed 1 via the power receiving resonance capacitor 32, for example, as follows. That is, when the motor manufactured by the motor rotor mounted inside the core 11 of the motor stator is a three-phase AC motor having three input terminals defined as U, V, W, U, V, A power receiving resonance capacitor 32 is connected to any two of the three terminals of W, and a power receiving coil 31 is connected to the remaining one terminal. If the motor stator is provided with a neutral point and there is a terminal connected to this neutral point, the power receiving resonance capacitor 32 is connected in series to all three terminals of U, V, and W, and the power receiving coil 31 is connected. Is connected in series to the above neutral point.

The inductance of the power receiving coil 31 and the capacitance of the power receiving resonance capacitor 32 are preheated with the frequency of the AC power of the AC power supply 21 so that a large amount of power can be efficiently applied to the coil 13 of the object 1 to be processed. It can be determined in consideration of the resonating frequency of the AC power applied to the coil 13 of the object 1 to be processed, which can be carried out.

Further, the power transmission unit 2 can be arranged below the molding line ML in the Z-axis direction so as not to interfere with the above-mentioned transport means for transporting the transport pallet P, for example. The inductance of the power transmission coil 23 and the capacitance of the power transmission resonance capacitor 22 can be determined in the same manner as the inductance of the power reception coil 31 and the capacitance of the stage resonance capacitor 32. Further, the power transmission resonance capacitor 22 can be directly connected and fixed to the lower end of the flattened power transmission coil 23 in the Z-axis direction.

In the above power supply system ES1, when AC power is input from the AC power source 21 provided in the power transmission unit 2 to the power transmission coil 23 via the power transmission resonance capacitor 22, the power transmission coil 23 undergoes a temporal change in the magnetic field and the electric field, and the magnetic field and the electric power source are changed. The energy generated due to the temporal change of the electric field propagates in the space between the power transmitting coil 23 and the power receiving coil 31, and AC power is input to the power receiving coil 31. That is, the AC power of the AC power supply 21 is input to the coil 13 of the object to be processed 1 in a non-contact manner via the power transmission coil 23 and the power receiving coil 31.

Therefore, if the coil 13 of the object to be processed 1 is connected in series to the power receiving coil 31 via the power receiving resonance capacitor 32 at the preheating station PHS to form the power receiving closing circuit CC2, the connection work is not performed again at the resin curing station RCS. In both cases, the AC power of the AC power supply 21 is input to the coil 13 of the object to be processed 1. An alternating current is supplied to the coil 13 of the object 1 to be processed by the alternating current power input in this way in a non-contact manner, and heat is generated. The heat at this time is conducted to the core 11, the mold mold (not shown), and the frame 14, and the object 1 to be processed is heated by both the preheating station PHS and the resin curing station RCS. Therefore, the connection work between the coil 13 of the object to be processed 1 and the power receiving coil 31 only needs to be performed once at the preheating station PHS, and the connection disconnection work between the coil 13 of the object to be processed 1 and the AC power supply 21 is performed after the preheat treatment. It is not necessary to perform the connection work, and the troublesomeness of the connection work and the connection disconnection work can be reduced. Further, after the preheat treatment at the preheating station PHS, the connection disconnection work for disconnecting the coil 13 of the object to be processed 1 and the AC power supply 21 becomes unnecessary, so that the energy loss when transporting to the resin injection station is eliminated. can do.

(Second Embodiment)
Next, with reference to FIG. 2, a second embodiment of the power feeding system in the molding line of the stator for the motor of the present invention will be described. Similar to FIG. 1, FIG. 2 also shows an outline of a preheating station PHS and a resin curing station RCS provided in the molding line ML of the power feeding system ES2 of the second embodiment. Further, the parts, parts, etc. corresponding to the parts, parts, etc. described with respect to the power supply system ES1 of the first embodiment are designated by the same reference numerals in FIG. 2, and the description thereof will be omitted.

In the power feeding system ES2, the power receiving resonance capacitor 32 of the power receiving unit 3 is provided on the upper end surface in the Z-axis direction of the portion of the transport pallet P on which the object 1 to be processed is not placed, and is connected in series with the power receiving coil 31. Further, a rectifier and an inverter 33 are provided on the upper end surface in the Z-axis direction of the portion of the transport pallet P on which the object 1 to be processed is not placed, and the power receiving coil 31 is connected in series with the rectifier and the inverter 33. Then, the rectifier and the inverter 33 are connected in series with the three terminals U, V, and W of the coil 13 of the transported body 1, and the power receiving coil 31 is processed together with the power receiving resonance capacitor 32 via the rectifier and the inverter 33. A power receiving closing circuit CC2 is formed by being connected in series with the coil 13 of the body 1.

In the power supply system ES2, similarly to the power supply system ES1 shown in FIG. 1, when AC power is input from the AC power source 21 provided in the power transmission unit 2 to the power transmission coil 23 via the power transmission resonance capacitor 22, a magnetic field and an electric field are applied to the power transmission coil 23. The energy generated due to the temporal change of the magnetic field and the electric field propagates in the space between the power transmission coil 23 and the power reception coil 31, and the AC power is input to the power reception coil 31 in a non-contact manner. Will be done. That is, the AC power of the AC power supply 21 is input to the coil 13 of the object to be processed 1 in a non-contact manner via the power transmission coil 23 and the power receiving coil 31. In such a power supply system ES2, an AC power is efficiently and non-contactly input from the AC power supply 21 to the coil 13 of the object 1 to be processed by the rectifier and the inverter 33 without being affected by the self-inductance of the coil 13. There is also the merit of being able to do it.

Then, in the power supply system ES2, if the coil 13 of the object to be processed 1 is connected in series to the power receiving coil 31 via the power receiving resonance capacitor 32, the rectifier and the inverter 33 at the preheating station PHS to form the power receiving closing circuit CC2, the resin is cured. The AC power of the AC power supply 21 is input to the coil 13 of the object to be processed 1 without performing the connection work again at the station RCS. AC current is supplied to the coil 13 of the object to be processed 1 by the AC power input in this way in a non-contact manner, and heat is generated. The heat at this time is conducted to the core 11, the mold mold (not shown), and the frame 14, and the object 1 to be processed is heated by both the preheating station PHS and the resin curing station RCS. Therefore, the connection work between the coil 13 of the object to be processed 1 and the power receiving coil 31 only needs to be performed once at the preheating station PHS, and the connection between the coil 13 of the object to be processed 1 and the AC power supply 21 is released after the preheat treatment. It is not necessary, and the troublesomeness of the connection work and the connection disconnection work can be reduced. Further, after the preheat treatment at the preheating station PHS, the connection disconnection work for disconnecting the coil 13 of the object to be processed 1 and the AC power supply 21 becomes unnecessary, so that the energy loss when transporting to the resin injection station is eliminated. can do.

Although the present invention has been described above with respect to the first embodiment and the second embodiment, the present invention is not limited to those embodiments. For example, the structure and structure of the molding line ML and the installation site of the power receiving coil 31 with respect to the object to be processed 1 are not particularly limited. Further, instead of directly placing the object to be processed 1 on the upper end surface of the transfer pallet P in the Z-axis direction, a heat insulating material is provided so that the heat of the heated object 1 to be processed is not conducted to the transfer pallet P. The object to be processed 1 can be placed on the heat insulating material.

ES1, ES2 ... Power supply system, ML ... Molding line, PHS ... Preheating station, RCS ... Resin curing station, 1 ... Processed object, 11 ... Core, 12 ... Slot, 13 ... Coil, 14 ... Frame, 2 ... Power transmission unit , 21 ... AC power supply, 22 ... Transmission resonance coil, 23 ... Transmission coil, 3 ... Power receiving part, 31 ... Power receiving coil, 32 ... Power receiving resonance capacitor, 33 ... Rectifier and inverter, CC1 ... Transmission closing circuit, CC2 ... Power receiving closing circuit ..

Claims (2)

A coil is wound around a plurality of slots provided at intervals on the inner peripheral portion of a core formed by laminating a plurality of annular electromagnetic steel sheets, and Z is set with the stacking direction of the electrical steel sheets as the Z-axis direction. A mold type that has a tubular frame that is long in the axial direction and fits outside the core, and has a body that is long in the Z-axis direction and a flange that extends outward from the lower end of the body in the Z-axis direction. An assembly in which the body is inserted into the core and a cavity is formed between the mold and the core and the frame is used as the object to be processed. In the molding line of a stator for a motor in which a resin injection station that injects an insulating resin into a cavity of a processed body and a resin curing station that cures the insulating resin injected into the cavity by heating are conveyed in this order to perform molding. It is a power supply system
In the preheating station and the resin curing station where AC power is applied to the coil of the object to be processed,
It is provided with a power transmission unit having an AC power supply, a power transmission resonance capacitor and a power transmission coil, and a power reception unit having a power reception coil and a power reception resonance capacitor.
The power transmission unit is installed in both the preheating station and the resin curing station. In the power transmission unit, the AC power supply and the power transmission coil are connected in series via a power transmission resonance capacitor to form a power transmission closing circuit.
In the power receiving unit, the power receiving coil and the power receiving resonance capacitor are connected in series, and the power receiving closed circuit can be formed by connecting the power receiving coil in series to the coil of the object to be processed via the power receiving resonance capacitor.
The power receiving coil is arranged below the object to be processed in the Z-axis direction, and the power transmitting coil is located on the opposite side of the power receiving coil from the object to be processed and faces the power receiving coil. A power supply system in a molding line of a stator for a motor, characterized in that the coil of the object to be processed is charged in a non-contact manner via a transmission coil and a power receiving coil. The power receiving unit also has a rectifier and an inverter, and the power receiving coil can form a power receiving closing circuit by connecting the power receiving coil together with the power receiving resonance capacitor in series with the coil of the object to be processed via the rectifier and the inverter. The power supply system in the molding line of the stator for a motor according to claim 1.

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