WO1999045626A1 - Moteur electrique immerge - Google Patents

Moteur electrique immerge Download PDF

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Publication number
WO1999045626A1
WO1999045626A1 PCT/JP1999/000944 JP9900944W WO9945626A1 WO 1999045626 A1 WO1999045626 A1 WO 1999045626A1 JP 9900944 W JP9900944 W JP 9900944W WO 9945626 A1 WO9945626 A1 WO 9945626A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
frame
liquid
electric motor
stator
Prior art date
Application number
PCT/JP1999/000944
Other languages
English (en)
Japanese (ja)
Inventor
Kozo Matake
Akihiro Yamamoto
Original Assignee
Ebara Corporation
Ebara Densan Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP06955698A external-priority patent/JP2002078276A/ja
Priority claimed from JP15010898A external-priority patent/JP2001339898A/ja
Application filed by Ebara Corporation, Ebara Densan Ltd. filed Critical Ebara Corporation
Priority to AU27449/99A priority Critical patent/AU2744999A/en
Publication of WO1999045626A1 publication Critical patent/WO1999045626A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs
    • H02K5/1285—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs of the submersible type

Definitions

  • the present invention relates to a submerged electric motor in which a liquid such as water enters or is enclosed in the electric motor, and the insulation of the electric motor winding is obtained by a liquid-proof insulation system.
  • Conventional underwater motors include dry, oil-sealed, and water-sealed types that use an insulation method that uses a water-resistant structure.
  • FIG. 7 is a diagram showing an example of a cross-sectional structure of a conventional dry-type underwater motor.
  • the electric motor M includes a stator core 1 fitted in a frame 3, and a rotor core 2 rotatably arranged at the center of the stator core 1.
  • the motor M is rotated by the electric power supplied through the cable 7 to rotate the impeller 15 of the pump P.
  • the shaft sealing device 10 such as a mechanical seal attached to the shaft end of the motor M prevents water from entering the motor room of the frame 3 ⁇ .
  • the oil-sealed underwater motor has a structure in which water is prevented from entering by a shaft sealing device and the motor room is filled with oil, like a dry-type motor.
  • Water-sealed motors have a thin metal cylinder called a can attached to the inner periphery of the stator, and are welded to the side plates to create a sealed structure inside the stator chamber.
  • a water-resistant insulated wire system that has the property.
  • FIG. 8 is a diagram showing an example of a cross-sectional structure of a can type underwater motor.
  • the electric motor is composed of a stator 103 comprising a stator core 103 a fitted into a tubular motor frame 101 and a stator winding 103 b, and the stator 10 0. 3 is provided with a rotor 104 rotatably arranged at the center thereof, and a metal thin cylindrical can ⁇ 06 is attached to the inner peripheral side of the stator 103, and a, 108 b, and a stator 103 consisting of a stator core 103 a and a stator winding 103 b is placed in a hermetically sealed stator chamber. is there.
  • the main shaft 105 to which the rotor 104 is fixed is rotatably inserted inside the stator chamber.
  • a sealed liquid 107 such as water or oil is filled inside the motor, and the inside and outside pressure is regulated and the motor is
  • a pressure regulating mechanism D composed of a diaphragm 102 and the like is provided on the non-load side of the motor frame 101 in order to absorb the thermal expansion of the sealed liquid 107 during operation.
  • the diaphragm 102 is generally made of rubber so that it can be freely deformed.
  • this pressure regulating mechanism D has a spring diaphragm 117 for supporting the rubber diaphragm 102 so that it is not collapsed when the motor is manufactured, just by filling the liquid 107 in the manufacturing process.
  • a mechanism such as the receiving plate 1 18 was also necessary, but it was necessary to fix it separately with parts such as the diaphragm cover 1 16 to seal the motor with the rubber diaphragm 102:
  • the sealed liquid 107 containing water as the main component is sealed in the tank, the filled liquid 107 does not touch the live parts such as the stator windings 103 b of the stator 103 so that the insulation does not decrease. It has a can structure.
  • Fig. 9 is a diagram showing an example of the cross-sectional structure of a winding of a water-resistant insulated electric wire type motor. It is a structure with 14 applied.
  • the conventional dry-type submersible motor as shown in Fig. 7 has a simple structure and is inexpensive because it can be handled with the same insulation configuration as that used on land, but when the shaft seal device 10 is damaged, the motor room There is a drawback that the insulation deteriorates due to flooding.
  • the oil-sealed underwater motor has a drawback that, similarly to the dry-type motor, when the shaft sealing device 10 is damaged, water is immersed in the motor room and insulation is reduced.
  • a canned type underwater motor as shown in Fig. 8 can handle the stator with the same insulation configuration as the onshore type, like the dry type, but has the following problems.
  • stator chamber has a completely sealed structure, maintenance such as rewinding is not possible even if a fault occurs in the electric wires.
  • the conventional water-resistant insulated electric wire type motor as shown in Fig. 9 has a problem that the cost is high because the winding is special. In addition, there are many water contact surfaces, and there is a danger that insulation may deteriorate due to slight defects in the winding.
  • the conventional submersible motor shown in Fig. 8 has the following problems.
  • the diaphragm 102 Since the diaphragm 102 is made of rubber, it often deteriorates, swells, and tears over time. In such a case, external liquid or sand enters the motor and shortens the life of the motor. I will.
  • the motor frame 101, can 106, and frame side plates 108a, 108b that constitute the above-mentioned can structure are made of expensive corrosion-resistant metal such as stainless steel to prevent corrosion by the motor external liquid. Had to be used.
  • the anti-load side bracket 1 09 b which is fixed to the anti-load side frame side plate 108 b, also has a structure that comes into contact with the motor external liquid. It was necessary to apply paint, and it was also necessary to attach a ring 114b to prevent the motor external liquid from entering the motor. From these facts, the structure of the conventional liquid ring type submerged motor is complicated and expensive, and uses many members such as stainless steel, resulting in an expensive motor.
  • the present invention has been made in view of the above points, and eliminates the above-described problems, eliminates the need for a closed structure using a can or the like, and can use an enamel winding for a land motor. It is a primary object of the present invention to provide a submerged electric motor that is simple in structure, inexpensive, and has a high operating efficiency.
  • a second object of the present invention is to provide an inexpensive submersible motor with improved durability, a long life, a simple structure, and a low cost.
  • a first aspect of the present invention provides a metal frame, a stator iron core fitted on an inner periphery of the frame, a stator winding, and a stator winding.
  • a connection part for connecting the wire and the lead wire is provided.All of these stator iron core, stator winding and connection part are filled with casting resin and molded, and the molding resin layer is the inner periphery of the frame.
  • the submerged electric motor is characterized in that it is configured to be in close contact with the surface to prevent liquid from entering the charged part.
  • a liquid-proof coating is formed so as to cover the surface of the mold resin layer and adhere to the inner peripheral surface of the frame, thereby forming a liquid-proof coating layer. It is characterized by having done.
  • One embodiment of the present invention is characterized in that the molded resin layer and the liquid-proof coating layer have elasticity.
  • the submerged motor is a single-phase motor
  • the starting capacitor for the single-phase motor and the triac starting switches are mounted on a donut-shaped substrate, and the substrate is cast with a resin. It is characterized by being molded with being carried.
  • variable speed circuit having an inverter circuit
  • the variable speed circuit is mounted on a donut-shaped substrate, and the substrate is filled with a casting resin and molded. I do.
  • a second aspect of the present invention is to provide a rotor having a canned structure mounted in a cylindrical motor frame, and a rotor having a main shaft mounted inside the stator.
  • the motor frame is mounted, frame side plates are mounted on both sides of the motor frame, brackets are mounted on both outer sides of the frame side plate, and a diaphragm mechanism is provided outside the anti-load side bracket, so that the motor frame
  • the diaphragm mechanism comprises: a non-load-side frame side plate; A thin metal diaphragm, which is bent to elastically deform in response to the thermal expansion of the filled liquid, is sealed in the motor frame, which is extended to the non-load side to accommodate the bracket. It is characterized by being fixed.
  • the motor frame and the diaphragm are both made of a corrosion-resistant metal, and the non-load-side frame side plate and the bracket are made of a non-corrosion-resistant metal.
  • FIG. 1 is a sectional view showing a first embodiment of the submerged electric motor according to the present invention.
  • FIG. 2 is a diagram showing a cross section taken along line AA of FIG.
  • FIG. 3 is a diagram showing a method of molding a stator iron core, a stator winding, and the like with a casting resin.
  • FIG. 4 is a diagram showing a configuration of a starting circuit of the single-phase motor.
  • FIG. 5 is a diagram showing a configuration of a variable speed circuit of the electric motor.
  • FIG. 6 is a sectional view showing a second embodiment of the submerged electric motor according to the present invention.
  • FIG. 7 is a diagram showing an example of a cross-sectional structure of a conventional dry-type underwater motor.
  • FIG. 8 is a diagram showing an example of a cross-sectional structure of a conventional can type underwater motor.
  • FIG. 9 is a diagram showing an example of a cross-sectional structure of a winding of a water-resistant insulated electric wire type motor.
  • FIG. 1 is a cross-sectional view showing a first embodiment of a submerged motor according to the present invention
  • FIG. It is a figure which shows 1A cross section.
  • the submerged electric motor will be described as an underwater electric motor.
  • the underwater motor includes a metal frame 3, a stator core 1 inserted into the inner periphery of the frame 3, and a stator winding inserted into a slot 1 a of the stator core 1. 4. It has a circuit board 9 on which various electrical components are mounted, and a connection portion 6 for connecting the circuit board 9 and the cable 7.
  • FIG. 3 is a diagram showing a method of molding with the above casting resin. As shown in the figure, a stator iron core 1, a stator winding 4, a circuit board 9 and a connecting portion 6 are assembled in a frame 3, and an assembly is further made to which a cable 7 is connected.
  • a jig A is inserted into the inner periphery of the lower end of the frame 3 of the assembly, and the cylindrical mandrel C is inserted into the center of the stator iron core 1 and assembled. Insert jig B into the inner periphery of the upper end of the. Release agent D is applied to the part of jig A that contacts frame 3, the part of jig A that contacts mold resin layer 5, and the part of mandrel C that contacts mold resin layer 5. It is.
  • reference numeral 8 denotes a waterproof coating layer, which is coated with another waterproof coating so as to cover the entire surface of the molded resin layer 5 and adhere to the inner peripheral surface of the frame 3 and the outer surface of the cable 7. It is formed. That is, the molding resin layer 5 and the waterproof coating layer 8 form a double insulating structure. With such a double insulation structure, it is possible to almost completely prevent water from entering from the inner peripheral side of the stator composed of the stator core 1 and the stator winding 4.
  • the inner peripheral portion of the stator corresponds to the gap between the rotor core 2 and the thickness of this portion must be reduced in consideration of the driving characteristics of the motor.
  • the mold resin layer 5 must have a sufficient thickness to ensure sufficient waterproofness. If the wall thickness is small, the water that has penetrated is transmitted through the interface between the stator iron core 1 and the mold resin layer 5 and the stator It reaches winding 4, which causes a decrease in insulation. Therefore, by forming the waterproof coating layer 8, the waterproof coating constituting the waterproof coating layer 8 can obtain sufficient waterproofness even with a small film thickness, so that the operating characteristics of the motor are not impaired. Insulation can be maintained.
  • the underwater motor When the underwater motor is used, its surroundings are cooled by water, so that the temperature difference inside the mold resin layer 5 increases, and heat stress is more likely to occur than the motor used on land. If a hard material is used for the mold resin layer 5, the mold resin layer 5 may be cracked by heat stress. Therefore, here, an elastic resin or rubber is used as a material for forming the mold resin layer 5 and the waterproof coating layer 8.
  • the rotor core 2 is fixed to the main shaft 20, and both ends of the main shaft 20 are rotatably supported by radial bearings 22 and 22, and a pump drive shaft is connected thereto.
  • An oil seal 26 is provided at the end on the side of the oil.
  • 1, 21 is a side plate, 23 is a thrust bearing, 24 is a centering device, 25 is a diaphragm, and 27 is a filled liquid such as oil.
  • the motor is a single-phase motor, As shown in FIG. 4, a starting circuit including starting capacitors 31 and 32 and a triac starting switch 33 is required.
  • the starting capacitors 31 and 32 and the triac starting switch 33 are mounted on the substrate 9 to form a starting circuit, and the starting circuit is molded together with the casting resin together with the substrate 9. And embedded in the mold resin layer 5.
  • the board 9 is formed in a donut shape so that the mounted starting capacitors 31 and 32 and the triac starting switch 33 and the like do not contact the rotor, and are disposed in the longitudinal direction of the stator. . In this way, by molding the starting circuit together with the substrate 9, the starting circuit is subjected to the waterproof insulation treatment.
  • variable speed circuit having an inverter circuit 41 as shown in FIG. 5
  • a circuit composed of the inverter circuit 41, the smoothing circuit 42, and the rectifier circuit 43 is provided.
  • the constituent parts are mounted on a substrate 9 to form a variable speed circuit, and the variable speed circuit is embedded in the mold resin layer 5 together with the substrate 9. In this way, by molding the variable speed circuit together with the board 9, the variable speed circuit is subjected to waterproof insulation treatment.
  • the underwater motor has been described as an example.
  • the present invention is not limited to the underwater motor.
  • a liquid other than water may be used as a motor for driving a pump. Can be used among others.
  • the stator core, All of the sub windings and connecting parts are filled with casting resin and molded.
  • the molding resin layer is in close contact with the inner peripheral surface of the frame to prevent liquid from entering the charged part. Such effects can be obtained.
  • stator chamber a hermetic structure with a can or the like, and the number of welds is reduced, simplifying the structure.
  • the can since the can is not used, the eddy current of the can is eliminated, and the motor efficiency is improved. Further, the stator can be easily taken out, and maintenance such as rewinding becomes possible.
  • a liquid-proof coating is formed by covering the entire surface of the molded resin layer and intimately adhering to the inner peripheral surface of the frame, thereby forming a liquid-proof coating layer. Therefore, excellent liquid insulation can be obtained without impairing the operating characteristics of the motor.
  • the molding resin layer and the liquid-proof coating layer have properties, the periphery of the electric motor is cooled by the liquid, and the temperature difference inside the molding resin layer increases, and the Even if stress is applied, there is no possibility that the mold resin layer is cracked.
  • a starting capacitor for a single-phase motor and a triac starting switch are mounted on a donut-shaped substrate, and the substrate is filled and molded with a casting resin.
  • the liquid-proof insulation treatment becomes easy. Also, external wiring is not required, and operation with a single-phase power supply becomes easy.
  • a variable speed circuit including an inverter circuit is provided, the variable speed circuit is mounted on a donut-shaped substrate, and the substrate is cast together. Since it is filled with resin and molded, liquid-proof insulation treatment of the substrate becomes easy. Also, variable speed operation of the motor with commercial power is possible.
  • FIG. 6 is a sectional view showing a second embodiment of the submerged electric motor according to the present invention.
  • the submerged motor has a stator 103 consisting of a stator core 103a and a stator winding 103b inside a cylindrical motor frame 101.
  • the load side and the counter load side frame side plates 108a, 108b are fixed to the inner peripheral surfaces on both sides by welding a, respectively, and both frame side plates 108a, 108
  • the charged part of stator 103 etc. is completely sealed and the charged part is not touched by liquid. It has a structure.
  • the submerged motor has the load-side and non-load-side brackets 109 a and 109 b on the outside of both frame side plates 108 a and 108 b, respectively.
  • the main shaft 105 is supported by the shafts 113a and 113b and the thrust bearings 112, and the bracket 109b on the non-load side and the diaphragm mechanism on the non-load side ( Pressure adjusting mechanism) A is attached.
  • the diaphragm mechanism A extends the motor frame 101 to the non-load side so as to accommodate the frame side plate 108 b and the bracket 109 b on the non-load side.
  • the opening of the motor frame 101 is sealed by welding (c) a thin metal diaphragm 102 directly to the inner peripheral surface of the end of the extended portion of the motor frame 101. It is configured to be fixed directly. It is not necessary to attach the diaphragm 102 to the end of the motor frame 101, and the diaphragm 102 may be attached to the end of the motor frame 101 if the end is larger than the end.
  • the diaphragm 102 is formed in a shape in which a thin metal disk is bent concentrically at several places to form wrinkles.
  • a sealed liquid 107 such as water or oil is sealed around the main shaft 105 in the motor frame 101. Since the bracket 109 b is provided with the through hole 191, the filling liquid 107 is filled up to the inside of the diaphragm 102.
  • the bracket 109b on the non-load side is fixed to the frame side plate 108b with bolts 115b in the same manner as in the conventional example shown in FIG. 8 above.
  • 9b is housed inside the motor frame 101 together with the frame side plate 108b unlike the above-mentioned conventional example, so that it does not come into contact with the liquid outside the motor together with the frame side plate 108b. Therefore, the conventional O-ring 114b shown in FIG. 8 is not required.
  • the motor frame 101 and the diaphragm 102 are made of a corrosion-resistant metal such as stainless steel because they come into contact with the liquid outside the motor, but the frame side plate 108 b and the bracket on the non-load side are used.
  • the 109b is housed inside the motor frame 101 and has no danger of contacting the liquid outside the motor, so that it can be made of inexpensive non-corrosion resistant metal such as iron.
  • 110 is a shaft seal device
  • 111 is a cable connector
  • 114 is an O-ring.
  • the outer periphery of the diaphragm 102 of the liquid ring type submersible motor constructed as described above is constrained by the motor frame 101, but it has elasticity due to the expansion and contraction of the bent wrinkles.
  • the motor inside the motor is operated from the mounted state (solid line in the figure) and the filled liquid 107 inside the motor expands thermally, it elastically deforms and recedes (dashed line in the figure), and the volume inside the motor easily increases. Can be made.
  • diaphragm 1 0 like 2 in shape and number of wrinkles is provided is not limited to this embodiment, may be a good UNA shape etc. as long as I UNA shape results in elastic by expansion and contraction c
  • the diaphragm 1.2 is fixed to the motor frame 101 by welding, but may be fixed by other means such as bonding.
  • the second embodiment of the present invention has the following excellent effects.
  • the diaphragm is made of metal, not only can its durability be improved. Because it has a higher elasticity than rubber, it does not require a spring-spring receiving plate or a diaphragm cover as in the past, simplifying the structure. .
  • the non-load side frame side plate and bracket are housed inside the motor frame and the inside of the motor frame is sealed by the diaphragm, so the non-load side frame side plate and bracket are inexpensive non-corrosion resistant materials.
  • the number of parts can be reduced, and the structure can be simplified.
  • the present invention is suitably used for a submerged electric motor which is used by being submerged for directly driving a submerged pump used for taking water from a deep well or the like.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

L'invention concerne un moteur électrique immergé dans lequel est introduit ou contenu de façon étanche un liquide tel que de l'eau ou de l'huile. Ledit moteur comprend un cadre métallique (3), un noyau de fer (1) statorique logé à proximité de la surface périphérique intérieure du cadre (3), un enroulement (4) de stator, et un élément (6) de connexion reliant l'enroulement (4) de stator à un câble (7), le noyau de fer (1) statorique, l'enroulement (4) de stator et l'élément (6) de connexion étant tous enchâssés dans de la résine de coulée en vue d'un moulage, et une couche (5) de résine de moulage étant au contact étroit de la surface périphérique intérieur du cadre (3) de manière à éviter que le liquide ne pénètre dans une pièce chargée.
PCT/JP1999/000944 1998-03-04 1999-02-26 Moteur electrique immerge WO1999045626A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU27449/99A AU2744999A (en) 1998-03-04 1999-02-26 Submerged electric motor

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP06955698A JP2002078276A (ja) 1998-03-04 1998-03-04 液中電動機
JP10/69556 1998-03-04
JP15010898A JP2001339898A (ja) 1998-05-29 1998-05-29 液封式液中モータ
JP10/150108 1998-05-29

Publications (1)

Publication Number Publication Date
WO1999045626A1 true WO1999045626A1 (fr) 1999-09-10

Family

ID=26410739

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1999/000944 WO1999045626A1 (fr) 1998-03-04 1999-02-26 Moteur electrique immerge

Country Status (2)

Country Link
AU (1) AU2744999A (fr)
WO (1) WO1999045626A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103618408A (zh) * 2013-11-20 2014-03-05 蒋湘科 一种防水集成驱动器

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54119601U (fr) * 1978-02-10 1979-08-22
JPS56147763U (fr) * 1980-04-03 1981-11-06
JPS58192449A (ja) * 1982-04-30 1983-11-09 Mitsubishi Electric Corp キャンドモートル
JPS58192458A (ja) * 1982-04-30 1983-11-09 Mitsubishi Electric Corp キヤンドモ−トル用ステ−タの製造方法
JPS59220050A (ja) * 1983-05-27 1984-12-11 Mitsubishi Electric Corp 水中電動機用ステ−タ
JPS6388053U (fr) * 1986-11-25 1988-06-08
JPH06178514A (ja) * 1992-12-02 1994-06-24 Shibaura Eng Works Co Ltd モールドモータ
JPH0688158U (ja) * 1993-05-24 1994-12-22 愛三工業株式会社 樹脂モールドモータの防錆構造
JPH07298531A (ja) * 1994-04-25 1995-11-10 Shibaura Eng Works Co Ltd 真空モータ
JPH09285056A (ja) * 1996-04-08 1997-10-31 Toshiba Corp モータ

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54119601U (fr) * 1978-02-10 1979-08-22
JPS56147763U (fr) * 1980-04-03 1981-11-06
JPS58192449A (ja) * 1982-04-30 1983-11-09 Mitsubishi Electric Corp キャンドモートル
JPS58192458A (ja) * 1982-04-30 1983-11-09 Mitsubishi Electric Corp キヤンドモ−トル用ステ−タの製造方法
JPS59220050A (ja) * 1983-05-27 1984-12-11 Mitsubishi Electric Corp 水中電動機用ステ−タ
JPS6388053U (fr) * 1986-11-25 1988-06-08
JPH06178514A (ja) * 1992-12-02 1994-06-24 Shibaura Eng Works Co Ltd モールドモータ
JPH0688158U (ja) * 1993-05-24 1994-12-22 愛三工業株式会社 樹脂モールドモータの防錆構造
JPH07298531A (ja) * 1994-04-25 1995-11-10 Shibaura Eng Works Co Ltd 真空モータ
JPH09285056A (ja) * 1996-04-08 1997-10-31 Toshiba Corp モータ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103618408A (zh) * 2013-11-20 2014-03-05 蒋湘科 一种防水集成驱动器

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