JPH11234948A - Inverter-controlled submergible motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inverter-controlled submergible motor the outside diameter of which is identical with the diameter of the submergible motor with no inverter attached, and which is free from magnetic unbalance, large in the load capacity of its thrust bearing, and excellent in inverter cooling efficiency. SOLUTION: A load-side gap portion defined by a frame 6, an upper side plate 7 and a can 5 is divided by a partition 32 into an inverter chamber A and an upper stator chamber B, and an inverter 24A and a stator winding 2 are thermally insulated. Further, the diameter of the smaller-diameter portion 5c of the can is reduced to enlarge the space of the inverter chamber A, thereby housing the inverter 24A in the frame 6 defined by the outside diameter of a stator 1. Further, the power element portion of the inverter 24A is bonded to the upper side plate 7 to be cooled by external water, and the thrust bearing 17A is housed in a thrust receiving case 34 installed outside a lower side plate 8 to increase the load capacity of the thrust bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter-controlled underwater motor having a built-in inverter (frequency converter), which is used as a drive source for a submersible pump.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view showing a canned motor as an inverter-controlled underwater motor having a conventional inverter. In the figure, 1 is a stator, 2 is a stator winding, 3 is a stator core on which the stator winding 2 is wound, 4
Is a lead wire, and the stator 1 is composed of a stator winding 2, a stator core 3 and a lead wire 4. Reference numeral 5 denotes a can, which is a very thin non-magnetic cylinder mounted on the inner peripheral surface of the stator core 3, reference numeral 6 denotes a frame in which the stator 1 is inserted, and reference numerals 7 and 8 denote water-tightly welded to both ends of the frame 6, respectively. The upper side plate and the lower side plate. The can 5 is water-tightly welded to the inner peripheral sides of the upper side plate 7 and the lower side plate 8 with the stator 1 inserted into the frame 6.

Reference numeral 9 denotes a rotor, 10 denotes a rotor core, 11 denotes a rotor conductor, and the rotor 9 includes a rotor core 10 and a rotor conductor 11. Reference numeral 12 denotes a rotor shaft (hereinafter, referred to as a shaft 12) fitted to the rotor core 10 of the rotor 9 by shrink fitting or the like. Reference numeral 13 denotes an upper bracket, 14 denotes a lower bracket, and 15 and 16 denote sleeve bearings mounted on the upper bracket 13 and the lower bracket 14, respectively, which rotatably support a shaft 12 integrated with the rotor 9.

Reference numeral 17 denotes a thrust bearing, which comprises a thrust disk 18, a thrust receiver 19, and a thrust support 19a fitted to the shaft 12, and supports a downward thrust load acting on the shaft 12.

[0005] A bellows 20 is mounted concentrically on the upper bracket 13, a bellows cover 21 is provided with a water passage hole 21 a and presses down and fixes the bellows 20, and 22 is an oil formed integrally with the bellows 20. This is a shaft sealing device called a seal. Reference numeral 23 denotes a sand guard collar fitted to the shaft 12 with a predetermined gap concentrically with the bellows cover 21.

Reference numeral 24 denotes an inverter disposed in an inverter chamber provided at the lower end of the frame 6. A metal substrate (not shown) on which a power element (not shown), which is one of the components of the inverter 24, is mounted. ) Is attached to the flat surface of the lower bracket 14. Reference numeral 25 denotes a lid of the inverter chamber which is welded to the lower end of the frame 6 in a watertight manner. 26
Is a crossover passed through a groove 3a provided on the outer peripheral portion of the stator core 3, and 27 is a power supply cable.

[0007] 28, 29 and 30 are crossover wires 26, respectively.
And the power supply cable 27, the crossover wire 26 and the primary terminal 24 a of the inverter 24, and the inverter secondary terminal 24 b and the lead wire 4. The upper bracket 13, the lower bracket 14, and the can 5 constitute a rotor chamber in which the rotor 9 is housed. The rotor chamber is provided for lubrication of the sleeve bearings 15, 16 and the thrust bearing 17, and A filling liquid 31 as a medium for dissipating heat of the rotor 9 is filled.

As described above, the main part of the canned motor provided with the conventional inverter has the bellows 20,
The upper bracket 13, the sleeve bearing 15, the stator 1, the rotor 9, the thrust bearing 17, the lower bracket 14, and the inverter 24 are arranged in this order.

Next, the operation will be described. Power supply cable 27, connector 2 from commercial frequency power supply (not shown)
8, power of a commercial frequency is supplied to the inverter 24 through the crossover 26, the connector 29, and the inverter primary terminal 24a, and this power is frequency-converted by the inverter 24, and the inverter secondary terminal 24b, the connector 30,
It is supplied to the stator winding 2 through the lead wire 4. Therefore, the canned motor can perform high-speed and low-speed operation at the frequency set by the inverter 24.

[0010] The sealed liquid 31 sealed in the rotor chamber is used.
Is sealed by the shaft sealing device 22 so as not to leak to the outside, and the volume of the sealed liquid 31 that has expanded due to the temperature rise is adjusted by the elastic deformation (expansion / contraction deformation) of the bellows 20, so that the pressure in the rotor chamber Does not occur.

[0011]

The conventional canned motor having a built-in inverter is constructed as described above. (1) Since the groove 3a for passing the crossover 26 is provided on the outer periphery of the stator core 3, The rotating magnetic field generated by the stator 1 is unbalanced and torque characteristics are deteriorated, such as torque ripple. (2) The bellows 20 is mounted on the upper part and is formed in a mortar shape with the upper side opened. Therefore, fine sand that has entered through the water holes 21 a provided in the bellows cover 21 accumulates in the bellows 20, and the bellows 20 cannot perform its original function of expanding and contracting by absorbing the volume expansion of the sealed liquid 31. There was a point. Also, (3) three connectors are required between the power supply cable 27 and the lead wire 4, and there have been problems such as a decrease in electrical contact reliability and an increase in cost.

(4) The thrust bearing is installed in the lower rotor chamber, and its outer diameter is limited by the inner diameter of the can 5. Therefore, it is impossible to cope with a model having a large thrust load. In order to design the overall dimensions of the canned motor to be small, the distance between the sleeve bearing 15 and the shaft sealing device 22 is relatively small. Therefore, when the sealed liquid 31 leaks, the space between the sleeve bearing 15 and the shaft sealing device 22 is reduced. There is a problem that air accumulates in the middle, the sleeve bearing 15 is operated in a dry operation, and lubrication is deteriorated, causing a seizure accident.

(6) A power element (not shown) of the inverter 24 is provided with a substrate (not shown) on the lower surface side of the lower bracket 14 in contact with the sealed liquid 31 having a temperature about 20 ° C. higher than the external water. However, there is a problem in that the cooling efficiency is poor because it is mounted via the inverter unit, and it is difficult to reduce the size of the inverter unit 24.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a first object of the invention is to provide an inverter-controlled underwater motor with an integrated inverter having a small magnetic imbalance and a good torque characteristic. Things.

A second object of the present invention is to provide an inverter-controlled underwater motor with an integrated inverter, which is excellent in cooling efficiency of the inverter and can be downsized.

A third object of the present invention is to provide an inverter-controlled underwater motor with an integrated inverter, which has a large load capacity of a thrust bearing and can withstand a relatively high thrust load.

A fourth object is that the diameter of the well is the same as that of the submersible motor without an inverter, and when used for a submersible pump, the diameter of the well hole can be made the same as that of the submersible motor without an inverter. An inverter-controlled underwater motor with an integrated inverter is obtained.

[0018]

According to a first aspect of the present invention, there is provided an inverter-controlled underwater motor, in which an inverter for controlling the underwater motor body is integrally mounted on the underwater motor body, and an operation cable is connected to a load side of the underwater motor body. In the inverter-controlled underwater motor connected to the submersible motor, the inverter is disposed in a load-side gap in the main body of the underwater motor.

An inverter-controlled underwater motor according to a second aspect of the present invention is the inverter-controlled underwater motor according to the first aspect, wherein the inverter has a power element portion, and the power element portion is a stator frame or a stator frame in a load-side gap. It is fixed to a support member in contact with the stator frame.

An inverter-controlled underwater motor according to a third aspect of the present invention is the inverter-controlled underwater motor according to the first or second aspect, wherein the operating cable connected to the inverter is a single cable consisting of a power line and a control line. What is a cable.

According to a fourth aspect of the present invention, there is provided an inverter-controlled underwater motor according to any one of the first to third aspects, wherein the partition member for partitioning the stator and the inverter is provided in the load-side gap. It is provided with.

An inverter controlled underwater motor according to a fifth aspect of the present invention is the inverter controlled underwater motor according to the fourth aspect, wherein the partition member comprises a metal plate and a heat insulating material provided on the surface of the metal plate. is there.

The inverter-controlled underwater motor according to a sixth aspect of the present invention is the inverter-controlled underwater motor of the fourth aspect, wherein the partition member is provided with a heat reflecting surface on a surface of a metal plate.

An inverter-controlled underwater motor according to a seventh invention is the inverter-controlled underwater motor according to the fourth invention, wherein the partition member is an insulating plate.

An inverter-controlled underwater motor according to an eighth aspect of the present invention is the inverter-controlled underwater motor according to any one of the fourth to seventh aspects, wherein the partition member supports a load-side bearing.

According to a ninth aspect of the present invention, in the inverter controlled underwater motor according to any one of the first to eighth aspects, the rotor shaft is provided outside the stator frame on the non-load side. A thrust bearing to be supported is provided.

An inverter controlled underwater motor according to a tenth aspect of the present invention is the inverter controlled underwater motor according to any one of the first to ninth aspects, wherein a fixed portion including a stator and an inverter, a rotor and a rotor are provided. A can is provided to separate the rotating portion including the shaft from the rotating portion, and the outer diameter of the can in the load-side gap is formed to be smaller than the outer diameter of the can fitted to the inner periphery of the stator.

An inverter-controlled underwater motor according to an eleventh aspect of the present invention is the inverter-controlled underwater motor according to the tenth aspect, wherein a load-side sleeve bearing is fitted to an inner peripheral surface of a small-diameter can in the load-side gap. In addition, a load-side sleeve bearing is supported by a partition member via a can.

According to a twelfth aspect of the present invention, there is provided an inverter-controlled underwater motor according to any one of the first to eleventh aspects, wherein the inverter-controlled underwater motor is provided outside the stator frame in the load-side gap where the inverter is provided. The diameter is equal to or smaller than the outer diameter of the stator frame determined based on the outer diameter of the stator.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a cross section of a canned motor as an inverter-controlled underwater motor. In the figure, those denoted by the same reference numerals as those of the conventional example indicate the same or equivalent parts as those of the conventional example.

In the figure, reference numeral 5A denotes an ultra-thin non-magnetic cylindrical can, which is formed on the inner peripheral surface of the stator core 3 and has a cylindrical shape smaller than the can large-diameter portion 5a. The can small-diameter portion 5b to which the load-side sleeve bearing 15 is mounted is formed into a cylindrical shape smaller than the can small-diameter portion 5b, and a can small-diameter portion 5c that forms an inverter chamber A described later on the outer peripheral side. , Can large diameter part 5a
A portion connecting the can small diameter portion 5b and the can small diameter portion 5b has a tapered shape, and a portion connecting the can small diameter portion 5b and the can small diameter portion 5c is formed in a stepped shape.

The stator frame is constituted by the frame 6 and the upper side plate 7 and the lower side plate 8 each having a donut shape welded to the upper end of the frame 6 in a watertight manner. The stator 1 is inserted into the stator frame, and a can 5A is welded to the inner peripheral surfaces of the upper side plate 7 and the lower side plate 8 in a watertight manner so as to include the stator 1 therein. That is, the upper end of the small-diameter portion 5c of the can 5A on the inner peripheral surface of the upper side plate 7 is
The lower end of the large-diameter can portion 5a of the can 5A is water-tightly welded to the inner peripheral surface of the can 5A.

Reference numeral 24A denotes an inverter disposed in the load side gap, the primary side of which is connected to a power supply cable 27 by a connector 28, and the secondary side of which is connected to the stator winding 2 via a connector 30. At the same time, the power element 24c, which is one of the components of the inverter 24A, is fixed to the inner surface of the upper side plate 7 via a metal substrate (not shown). The power supply cable 27 is a single cable composed of a power line and a control line, and has a structure in which a cable lead-in portion that penetrates the upper side plate 7 is the only one. Reference numeral 32 denotes a cable holder for fixing the power supply cable 27.

Reference numeral 33 denotes a partition plate serving as a partition member. The inverter 24A connects a load-side gap formed on the upper side of the stator winding 2 composed of the frame 6, the upper side plate 7 and the can 5A, that is, on the load side. It partitions into an inverter room A and an upper stator room B which are arranged. That is, the partition plate 33 is provided between the stator winding 2 and the inverter 24A in the load-side gap, the outer diameter side of which is in contact with the inner circumference of the frame 6, and the inner diameter side of which the sleeve bearing 15 is fitted. The sleeve bearing 15 is indirectly supported by holding the outer peripheral portion of the portion 5b. Note that the partition plate 33 has a configuration in which a heat insulating material that also serves as electrical insulation is attached to the surface of the metal plate.

Numeral 34 denotes a thrust receiving case installed at the lowermost part of the motor, which accommodates a thrust bearing 17A composed of a thrust disk 18, a thrust receiver 19 and a thrust support 19a. The bellows 20 and the bellows cover 21 having the water holes 21a are press-fitted and fixed to the thrust receiving case 34 such that the opening side faces downward.

The upper side plate 7, the lower bracket 14, and the can 5A constitute a rotor chamber C in which the rotor 9 and the sleeve bearings 15, 16 for supporting the shaft 12 are accommodated.
The rotor chamber C and the thrust bearing chamber D including the thrust bearing 17A in the thrust receiving case 34 are electrically connected through a through hole 14a provided in the lower bracket 14, and are connected to the rotor chamber C and the thrust bearing chamber D. Is the sleeve bearing 1
5, 16 and a filling liquid 31 as a lubricant for the thrust bearing 17A and a medium for dissipating heat of the rotor 9 are filled.

The operation of the canned motor in the first embodiment is substantially the same as that of the conventional canned motor shown in FIG. 3 in that electric power of the commercial frequency is supplied to the inverter 24A from the primary side through the power supply cable 27 and the connector 28. Then, the frequency is converted by the inverter 24A, and the frequency is converted from the secondary side of the inverter to the stator winding 2 through the connector 30 to operate the canned motor at a variable speed.

The rotor chamber C and the thrust bearing chamber D
The sealed liquid 31 is sealed by the shaft sealing device 22 so as not to leak outside, almost in the same manner as the conventional canned motor shown in FIG. The expansion and contraction of the rotor chamber C does not cause an increase in pressure in the rotor chamber C and the thrust bearing chamber D.

The canned motor provided with the inverter according to the first embodiment has an upper side plate 7 provided with a shaft sealing device 22, an inverter 24A, a stator 1 and a rotor 9, a lower side plate 8, and a thrust bearing 17A. And a thrust receiving case 34 accommodating the bellows 20. The greatest feature of the thrust receiving case 34 is that the inverter 24A is disposed in the inverter chamber A in the load-side gap located at the upper part, and the lower side plate 8 located at the lower part The thrust bearing 17A is disposed in the thrust receiving case 34 connected to the thrust bearing 17A.

That is, since the inverter 24A is installed in the inverter room A in the space above the stator winding 2, the crossover 26 in the conventional example shown in FIG. There is no problem of torque characteristics such as ripple. Also, the power supply cable 27
From the stator winding 4 to the connector 2
8 and 30, and the number of connection points of the wiring by the connector is reduced from three to two, so that the reliability in connection is improved and the component cost can be reduced. The operation cable 27 connected to the inverter 24A
Is a single cable in which the power line and the control line are integrated, so that only one cable lead-in portion penetrating through the upper bracket 7 is provided, which facilitates watertightness and improves the reliability of watertightness.

The thrust disk 18, the thrust receiver 1
9. A thrust bearing case 3 in which a thrust bearing 17A constituted by a thrust support 19a is coupled to the lower side plate 8.
4, the diameter of the thrust bearing surface can be made larger than in the case where the thrust bearing 1 is installed in the can 5 as in the conventional example shown in FIG.
The load capacity of 7 A can be increased, and it can sufficiently cope with a high-output pump.

Further, in the canned motor provided with the inverter according to the first embodiment, the power element 24c of the inverter 24A is attached in close contact with the inner surface of the upper side plate 7 via a metal substrate (not shown). Since the upper side plate 7 is usually directly immersed in the low-temperature motor external water, the heat radiation structure of the power element 24c is relatively small in order to efficiently radiate the heat generated by the power element 24c to the external water. Thus, a canned motor that can be reduced in size and cost can be obtained.

Further, a partition plate 33 is provided between the stator winding 2 and the inverter 24A so that a load-side gap is formed in the inverter room A.
And the upper stator chamber B, and the partition plate 33 has a structure in which a heat insulating material is bonded to the surface of the metal plate. A synergistic effect with the effect of dissipating heat to the frame 6 side via the plate is obtained,
Thermal interference between the stator winding 2 and the inverter 24A can be prevented. Furthermore, since the heat insulating material bonded to the surface of the metal plate also has electrical insulation, and the partition plate 33 is also an insulating plate,
The insulation distance between the inverter 24A and the coil end of the opposed stator winding 2 can be shortened. Therefore, the partition plate 33
Can be arranged close to each other, and the size can be reduced by shortening the axial dimension.

Further, since the sleeve bearing 15 is supported by the partitioning plate 33 through the small can portion 5b, the sleeve bearing 15 is provided as compared with the conventional example shown in FIG.
The span between the shaft bearing and the sleeve bearing 16 can be made relatively short.
2 can be kept low.

Further, the volume of the sealed liquid 31 at the upper part of the sleeve bearing 15 can be increased. That is, the interval between the shaft sealing device 22 installed on the upper side plate 7 and the sleeve bearing 15 is inevitably increased due to the presence of the inverter chamber A, and the can small diameter portion 5c above the sleeve bearing 15 is provided.
Has a relatively large internal volume. The sealed liquid 31 filled in the rotor chamber C and the thrust bearing chamber D is also filled in the small-diameter can portion 5c, but the sealed liquid 31 above the sleeve bearing 15 has a relatively large amount. Even if the liquid 31 leaks slightly, the sleeve bearing 15 is less likely to be in a dry operation, and a highly reliable canned motor can be obtained.

Also, the diameter of the can small-diameter portion 5c forming the inverter room A is made smaller than the inner diameter of the stator, and the inverter room A is widened and the inverter 24A is installed.
The outer diameter of the outer frame of the inverter room A can be set to be equal to or less than the size set based on the outer diameter of the stator 1. That is, since the inverter 24A can be installed in the frame 6 set based on the outer diameter of the stator 1, a submersible pump (not shown) using this canned motor and a canned motor not having an inverter built-in type can be used. The size of the well hole with the submerged pump (not shown) can be made the same.

Further, since the bellows 20 is installed in the thrust receiving case 34 so that the opening side faces downward, fine operation does not accumulate in the bellows 20 and stable operation can be expected for a long time.

Embodiment 2 Embodiment 2 of the present invention will be described with reference to FIG. FIG. 2 is a diagram showing a cross section of a load-side gap and its vicinity in a canned motor as an inverter-controlled underwater motor. The only difference from the canned motor according to the first embodiment shown in FIG. 1 in the manner of disposing the inverter 24A in the inverter room A provided in the load-side gap is that the other configuration is the same. The illustration is omitted except for the side gap and its vicinity.

In the figure, reference numeral 35 denotes a shell which is fitted into the frame 6 and serves as a support member for the inverter 24A. The shell 35 is made of metal having good heat conductivity, and the inverter 24A is disposed on a flat disk portion thereof. The power element 24c constituting the inverter 24A is connected to the shell 35 via a metal substrate (not shown). It is fixed to a flat disk.

As in the case of the first embodiment shown in FIG. 1, the primary side of the inverter 24A is connected to the connector 28.
The secondary side is connected to the stator winding 2 via a connector 30. The power of the commercial frequency is frequency-converted by the inverter 24A and supplied to the stator winding 2. Operate the canned motor at variable speed.

In the second embodiment, the inverter 24A
The power element 24c is mounted in close contact with the inner peripheral surface of the frame 6 via a metal shell 35. Since the frame 6 is usually directly immersed in the low-temperature motor external water, the power element 24c The heat of 24c can be efficiently radiated to external water. Accordingly, the heat radiation structure of the power element 24c can be formed relatively small, and a small canned motor can be obtained. Further, since the shell 35 is fitted into the frame 6 with the inverter 24A attached to the shell 35, an assembly workability is excellent and a cost reduction can be obtained.

The inverter-controlled underwater motor according to the first and second embodiments is a canned motor having a can 5A and a sealed liquid 31 sealed in a rotor chamber C, but is limited to the canned motor. Even if the rotor chamber is a dry type underwater motor (not shown) without a can, the inverter is arranged in the upper load side gap (not shown) and the thrust bearing is By arranging it in a thrust receiving case (not shown) provided below the side plate, the same effect as the canned motor shown in FIGS. 1 and 2 can be obtained.

That is, the imbalance of the rotating magnetic field is eliminated, the problem of torque characteristics such as torque ripple does not occur, the motor performance is improved, and the number of connectors between the power supply cable and the stator winding is reduced. Connection reliability is also improved. Further, since the diameter of the thrust bearing surface can be increased, the load capacity of the thrust bearing can be increased, and the pump can sufficiently cope with a high-output pump. Furthermore, since the power element of the inverter can be fixed to the inner surface of the upper side plate 7 via a metal substrate, heat can be efficiently dissipated.
The heat radiation structure of the power element 24c can be formed relatively small.

The partition plate 33 as a partition member in the inverter-controlled underwater motors of the first and second embodiments has a configuration in which a heat insulating material also serving as an electrical insulation is bonded to the surface of a metal plate. However, the present invention is not limited to the configuration in which the heat insulating material is bonded. The same effect can be obtained even when the heat insulating material is a metal plate whose surface is coated with a heat insulating layer also serving as an electrical insulation (not shown). Can be

Although many materials having good thermal insulation performance also have good electrical insulation performance, the stator winding 2 and the inverter 24A are sufficiently considered for their electrical insulation performance. If present, the insulation does not necessarily require electrical insulation. Further, if the partition member is only for the purpose of preventing thermal interference between the stator winding 2 and the inverter 24A and supporting the load-side sleeve bearing 15, the partition member is made of a metal plate that can withstand the support of the sleeve bearing 15. The radiant heat and convective heat generated by the stator winding 2 and the like may be cut off by the metal plate, and the heat absorbed by the metal plate is radiated to external water via the frame 6. Thermal interference can be reduced to a level that does not pose a practical problem.

Further, instead of providing a heat insulating material, a metal reflecting material such as a heat reflecting material having an excellent heat reflecting performance is bonded, a coating layer or a plating layer of a white or silver color system is formed, or a metal plate surface is mirror-finished. Even when a heat reflecting surface is provided on the surface of the plate, a synergistic effect of a thermal blocking effect of reflecting radiant heat received by the partition member and an effect of radiating heat to the frame 6 side through a metal plate having a good thermal conductivity. By this effect, a practically sufficient effect of reducing thermal interference between the stator winding 2 and the inverter 24A can be obtained.

If the canned motor does not support the load-side sleeve bearing with the partition member, the insulating plate as the partition member does not need to be a composite material with a metal plate. Even with a resin plate or the same molded product, the effect of reducing thermal interference between the stator winding 2 and the inverter 24A can be obtained.

Further, the metal plate and the insulating plate constituting the partition member are not limited to the so-called "plate-like" shape, but may include those provided with reinforcing ribs or the like for increasing the structural strength. Needless to say.

[0059]

According to the first aspect of the present invention, since the inverter is disposed in the gap on the load side of the underwater motor main body in which the operating cable is connected to the load side, it is easy to route the operating cable connected to the inverter. In addition, the crossover of the stator becomes unnecessary, and there is an effect that there is no imbalance in the rotating magnetic field and good torque characteristics can be obtained.

According to the second aspect of the present invention, since the power element constituting the inverter is fixed to the stator frame in the load-side gap or to the supporting member in contact with the stator frame, heat generated by the power element is reduced. Heat can be dissipated to the external water in the underwater motor via the stator frame, and there is an effect that excellent cooling characteristics can be obtained and the inverter can be downsized.

According to the third aspect of the present invention, since the operating cable connected to the inverter is a single cable in which the power line and the control line are integrated, the operating cable penetrates the end of the stator frame. The cable lead-in part is the only part, and the watertightness is easy and there is an effect that a highly reliable one can be obtained.

According to the fourth aspect of the present invention, since the partition member separates the stator winding and the inverter in the load-side gap, thermal interference between the stator winding and the inverter can be reduced. Since it can be arranged close to the member,
There is an effect that the size can be reduced by shortening the axial dimension.

According to the fifth aspect of the present invention, the partition member is constituted by the metal plate and the heat insulating material provided on the surface of the metal plate. According to the sixth aspect, the partition member is formed of the metal plate. Since the heat reflecting surface is provided on the surface, there is an effect that an excellent heat insulating and heat radiating effect can be obtained.

According to the seventh aspect of the present invention, since the partition members are formed of insulating plates, the electrical insulation is excellent, and the stator windings and the inverter are arranged closer to each other with the respective partition members interposed therebetween. Thus, there is an effect that a device that can be made smaller can be obtained.

According to the eighth aspect of the present invention, since the load-side bearing is supported by the partition member, it is possible to prevent the bearing span from being lengthened in the inverter built-in type, and to obtain a rotor shaft vibration that can be suppressed low. effective.

According to the ninth aspect, the thrust bearing for supporting the rotor shaft is disposed outside the stator frame on the non-load side, so that a relatively large capacity thrust bearing is employed with a simple structure. It is possible to obtain a material capable of withstanding a relatively high thrust load.

According to the tenth aspect, the outer diameter of the can of the load side gap is formed smaller than the outer diameter of the can fitted to the inner periphery of the stator, so that the space for incorporating the inverter can be expanded. In addition, there is an effect that an inverter can be easily provided.

According to the eleventh aspect, the upper sleeve bearing is fitted to the small-diameter can, and the upper sleeve bearing is supported by the partition member via the can. The span between the upper and lower sleeve bearings can be made relatively short, the rotor shaft vibration can be kept low, and the volume of the filled liquid on the upper side of the upper sleeve bearing increases, reducing the risk of dry operation in the upper sleeve bearing. There is an effect that what can be obtained is obtained.

Further, according to the twelfth aspect, the outer diameter of the frame of the load-side gap containing the inverter is made smaller than the outer diameter of the stator frame determined based on the outer diameter of the stator. When a submersible pump using a submersible electric motor of the type is replaced with a submersible pump using a submersible electric motor of the present invention, there is an effect that a pump having the same well hole diameter can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a canned motor according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a cross section of a load-side gap portion and its vicinity in a canned motor according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing a conventional canned motor.

[Explanation of symbols]

1 stator, 2 stator windings, 3 stator core, 5A
Can, 6 frame, 7 upper side plate, 8 lower side plate,
9 rotor, 10 rotor core, 12 rotor shaft, 14
Lower bracket, 15, 16 sleeve bearing, 17A
Thrust bearing, 20 bellows, 22 Shaft sealing device, 2
4A inverter, 27 power supply cable, 28, 30
Connector, 31 Filled liquid, 33 Partition plate, 34 Thrust receiving case, 35 Shell

Continuation of the front page (51) Int.Cl. ⁶ Identification code FI H02K 5/18 H02K 5/18 5/22 5/22 (72) Inventor Sumio Sumoto 1-1-1, Imajukuhigashi, Nishi-ku, Fukuoka City, Fukuoka Prefecture Fuku Ryo Semicon Engineering Co., Ltd.

Claims (12)

[Claims] An inverter controlled underwater motor in which an inverter for controlling the underwater motor main body is integrally attached to the underwater motor main body and an operation cable is connected to a load side of the underwater motor main body. An inverter-controlled underwater motor, wherein the motor is disposed in a load-side gap of the motor. 2. The inverter-controlled underwater motor according to claim 1, wherein the inverter includes a power element portion, and the power element portion is fixed to a stator frame in a load-side gap or a support member in contact with the stator frame. An underwater motor controlled by an inverter. 3. The inverter control underwater motor according to claim 1, wherein the operation cable connected to the inverter is a single cable including a power line and a control line. Underwater motor. 4. The inverter-controlled underwater motor according to any one of claims 1 to 3, wherein
An inverter-controlled underwater motor, comprising a partition member for separating a stator and an inverter. 5. The inverter-controlled underwater motor according to claim 4, wherein the partition member comprises a metal plate and a heat insulating material provided on a surface of the metal plate. 6. The inverter-controlled underwater motor according to claim 4, wherein the partition member has a heat reflecting surface provided on a surface of a metal plate. 7. The inverter-controlled underwater motor according to claim 4, wherein the partition member is an insulating plate. 8. The inverter-controlled underwater motor according to claim 4, wherein the partition member supports a load-side bearing. 9. The inverter-controlled underwater motor according to claim 1, wherein a thrust bearing for supporting the rotor shaft is provided outside the stator frame on the non-load side. And inverter controlled underwater motor. 10. The inverter-controlled underwater motor according to any one of claims 1 to 9, further comprising a can separating a fixed portion including a stator and an inverter and a rotating portion including a rotor and a rotor shaft. An inverter-controlled underwater motor, wherein the outer diameter of the can in the load-side gap is smaller than the outer diameter of the can fitted to the inner periphery of the stator. 11. The inverter-controlled underwater motor according to claim 10, wherein a load-side sleeve bearing is fitted to an inner peripheral surface of a can formed into a small diameter in the load-side gap, and a partition member intervenes through the can. An inverter-controlled underwater motor, wherein the load-side sleeve bearing is supported. 12. The inverter controlled underwater motor according to claim 1, wherein the outer diameter of the stator frame in the load-side gap where the inverter is disposed is:
An inverter-controlled underwater motor having a stator frame outer diameter that is determined based on the outer diameter of the stator.