JP6207200B2 - Canned motor and submersible pump equipped with the same - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION

  The present invention relates to a canned motor and a submersible pump, and in particular, a canned motor used by being submerged in a liquid to directly drive a submersible pump used when water is taken from a deep well or the like, and a liquid equipped with the canned motor. For medium pumps. More specifically, the present invention relates to a canned motor with a built-in capacitor.

  Conventionally, as shown in FIG. 8, as a pump for taking water from a deep well or the like, an elongated submerged pump 202 installed in the vertical direction along the well W has been used. The submerged pump 202 includes a pump main body 203 for actually pumping water and a motor 201 for driving the pump main body 203. As the motor 201, a so-called canned motor 201 in which a stator chamber and a rotor chamber are separated by a can may be used. In the submerged pump 202 for deep wells, the canned motor 201 is generally disposed on the lower side, the pump body 203 is disposed on the upper side, and both are directly connected.

  FIG. 9 is a cross-sectional view showing a conventional canned motor 201 used in a submerged pump (see Patent Document 1). The canned motor 201 uses a capacitor 241 to start the motor and improve driving performance. In the canned motor 201 for a single-phase deep well submerged pump that uses the capacitor 241, there is one in which the capacitor 241 is installed outside (on the ground). However, the canned motor 201 shown in FIG. 9 incorporates the capacitor 241 in the canned motor 201 for the purpose of improving the convenience of connection to the power source and reducing the manufacturing cost.

  In the canned motor 201, the motor frame 211, the can 221 and the frame side plates 213a and 213b constitute a sealed space. This sealed space becomes the stator chamber 231 of the canned motor 201. By incorporating both the stator winding 255 and the capacitor 241 in the stator chamber 231, a capacitor switchboard is not required, and the number of wires from the canned motor 201 to the external power source can be reduced to two. Incidentally, in the case of an external capacitor type canned motor, three conductors are required. For this reason, by incorporating the capacitor 241, the convenience of installing the pump is increased, and the cost of the power supply line can be reduced.

US Pat. No. 6,359,353

  However, the conventional canned motor with a built-in capacitor has the following problems. That is, when the canned motor 201 generates driving force, the temperature of the stator winding 255 rises. Due to the temperature rise of the stator winding 255, the capacitor 241 housed in the stator chamber 231 is heated. Then, when the temperature of the capacitor 241 exceeds the rated temperature, there is a risk of performance deterioration and life reduction. Therefore, in order to incorporate the stator winding 255 and the capacitor 241 as the heat source in the same stator chamber 231, it is necessary to suppress the temperature rise of the capacitor 241. Incidentally, a general capacitor starts to deteriorate at a temperature of about 80 to 90 ° C.

  As described above, in the conventional submersible pump 201 for deep wells, the canned motor 201 with a built-in capacitor is disposed below, and the pump body 203 (load) is connected to the upper side (on the ground side) of the canned motor 201. ing. In the stator chamber 231, a capacitor 241 is disposed between the stator winding end 255a above the stator 251 and the upper frame side plate 213a. That is, since the heat moves upward, the capacitor 241 is arranged on the upper side (load side) where the temperature rise is larger than the lower side. For this reason, the temperature of the capacitor 241 easily rises.

  Further, in the canned motor 201 shown in FIG. 9, the distance between the upper stator winding end 255a and the capacitor 241 is short, and there is no member to isolate, so that the radiant heat from the stator winding end 255a heats the capacitor 241. . As countermeasures, it is necessary to increase heat dissipation by using an expensive capacitor with high heat resistance or by encapsulating a resin 233 in the stator chamber 231. This is because the internal heat can be transmitted to the motor frame 211, the frame side plates 213a and 213b, etc. by enclosing the resin 233.

  In addition, a configuration for arranging the capacitor 241 at an appropriate position in the space of the stator chamber 231 is necessary. Here, “appropriate position” means, for example, a distance that reduces the thermal influence from the stator winding end 255a, a position that can maintain a distance for maintaining insulation, and the like. For this reason as well, in the conventional canned motor 201, the capacitor 241 is fixed simultaneously with measures against temperature rise by sealing the resin 233 in the stator chamber 231. However, in this configuration, there is a problem that the cost increases due to an increase in the number of parts and a complicated manufacturing process due to the encapsulation of the resin 233.

  The present invention has been made in view of the above-described problems, and an object of the present invention is a canned motor used for a submerged pump, which has a simple structure despite its improved durability and long life. The object is to provide an inexpensive canned motor with a built-in capacitor.

  In order to solve the above problems, according to a first means of the present invention, a canned motor with a built-in capacitor for driving a submerged pump, which is installed inside a cylindrical motor frame and the motor frame. A cylindrical can is provided, the stator and the capacitor are installed in a stator chamber between the motor frame and the can, and the capacitor is arranged below the stator.

  By adopting the above configuration, even when the canned motor operates and the temperature of the stator winding rises, the heat moves upward. For this reason, the capacitor | condenser arrange | positioned below a stator is hard to be heated. The fact that the capacitor is hardly heated means that an inexpensive capacitor with low heat resistance can be used, and the manufacturing cost can be reduced.

  In the second means, the capacitor is fixed to a lower frame side plate for sealing the lower end opening of the stator chamber.

  In the third means, the capacitor is fixed to the lower frame side plate with an adhesive or a screw.

  The fourth means employs a configuration in which a ring-shaped heat insulating material is provided between the capacitor and the stator.

  In the fifth means, the heat insulating material is made of an insulating material.

  In the sixth stage, the heat insulating material is configured to include a foot for maintaining a gap with respect to the capacitor.

  In the seventh means, the heat insulating material is sandwiched and fixed between two cylindrical members disposed between the capacitor and the stator.

  In the eighth means, an upper frame side plate for sealing the upper end opening is fixed to the upper end of the stator chamber, and a connector terminal for power supply is attached to the upper frame side plate. ing.

  In the ninth means, the connector terminal and the capacitor are connected by at least one conducting wire, and this conducting wire passes through the stator.

  In the tenth stage, the stator has a configuration in which a stator core slot or a stator core outer peripheral cutout is formed in the stator, and the conductive wire passes through at least one of the stator core slot or the cutout.

  In the eleventh means, the capacitor has a donut shape, and a stepped recess having a diameter corresponding to the outer diameter of the capacitor is formed on the upper surface of the lower frame side plate. .

  The twelfth means adopts the configuration of the canned motor according to any one of the means 1 to 11 and a pump main body connected to the canned motor.

As described above in detail, according to the present invention, the following excellent effects can be obtained as an example. That is, the capacitor is disposed below the end of the lower stator winding, which has a relatively low temperature in the stator chamber, so that the influence of heat from the stator winding as a heat source can be reduced.

1 is a cross-sectional view of a built-in capacitor type canned motor according to an embodiment of the present invention. It is a figure explaining the heat insulation structure added to the canned motor disclosed in FIG. 1, FIG. 2 (A) is a top view which shows a heat insulating material, FIG.2 (B) is the cand which applied the heat insulating structure by this heat insulating material. It is a fragmentary sectional view of a motor. It is sectional drawing which shows the heat insulation structure different from the heat insulation structure disclosed in FIG. FIG. 2 is a circuit diagram of the canned motor disclosed in FIG. 1. FIG. 5A is a diagram showing a detailed wiring diagram for realizing the circuit diagram disclosed in FIG. 4. FIG. 5A is a diagram in which the conductor connecting one conductor (5) of the capacitor and one end (8) of the connector is the stator. FIG. 5B is an example in which a capacitor wire (5) and one end (8) of the connector are connected to the stator, and FIG. 5 (C) is an example of the connector (8). The lead wire connected to one end (5) of the capacitor and one end (4) of the auxiliary coil and the lead wire connected to one end (6) of the capacitor pass through the stator. FIG. 5 (D) shows one end of the connector. An example is shown in which the conducting wire connecting (7) and one end of the main winding coil and the conducting wire connecting one end (8) of the connector and one end (5) of the capacitor pass through the stator. It is sectional drawing of the stator for showing the structure where conducting wire passes a stator. 7A and 7B are diagrams showing a capacitor used in the canned motor disclosed in FIG. 1, FIG. 7A shows a side view, FIG. 7B shows a plan view, and FIG. 7C shows FIG. It is sectional drawing in the CC line. It is a figure which shows the general installation aspect of a submerged pump. It is sectional drawing which shows the conventional canned motor.

  Moreover, the influence of the radiant heat from a coil end can be reduced by arrange | positioning a heat insulating material between a lower stator coil end and a capacitor | condenser. Further, by fixing the capacitor to the lower frame side plate, it is possible to easily and surely position the capacitor, and to release the heat of the capacitor to the metal part.

  Note that the above-described effects are merely examples, and the technical idea of the present invention is not limited to those for realizing the effects. That is, even if the invention has other technical effects, there can be inventions that belong to the technical scope of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In addition, the following description shows an example to the last and is not the meaning which limits the technical scope of this invention to the following embodiment. Moreover, the component which comprises each embodiment can be combined arbitrarily, and is not limited to the combination demonstrated below.

[First Embodiment]
[Overview]
FIG. 1 is a cross-sectional view of a canned motor 1 with a built-in capacitor according to the first embodiment. As an example, the canned motor 1 is used in a submersible pump for a deep well. As shown in FIG. 1, the canned motor 1 includes a cylindrical motor frame 11 and a cylindrical can 21 installed inside the motor frame 11, and a stator 51 and a capacitor 41 are connected to the motor frame 11. One of the features is that the capacitor 41 is disposed on the lower side of the stator 51 and is disposed in the stator chamber 31 between the can 21.

[Canned motor structure]
The cylindrical motor frame 11 and the can 21 are arranged concentrically, and a stator chamber 31 is formed between them. Load side (upper) and anti-load side (lower) frame side plates 13a and 13b are fixed to the inner peripheral surface of the motor frame 11 at upper and lower end openings of the stator chamber 31 by welds a. . Furthermore, the outer peripheral surfaces of the upper and lower end portions of the cylindrical can 21 are fixed to the inner peripheral surfaces of both frame side plates 13a and 13b by welds b. As a result, the stator chamber 31 is completely sealed and a liquid structure is prevented from entering from the outside.

  On the further outer side of the upper and lower frame side plates 13a and 13b, brackets 15a and 15b on the load side (upper side) and on the opposite side (lower side) are fixed by bolts 17a and 17b, respectively. These brackets 15 a and 15 b are for supporting the rotor main shaft 63 at the upper and lower ends of the canned motor 1. For this reason, each bracket 15a, 15b is provided with a radial bearing 19a, 19b at the center, and a thrust bearing 19c is provided on the lower bracket 15b. As is apparent from the above configuration, the rotor chamber is formed by the can 21 and the brackets 15a and 15b.

In the stator chamber 31, a stator 51 is installed at a substantially central portion in the longitudinal direction of the canned motor 1. The stator 51 includes a cylindrical stator core 52 and a stator winding 55, and is attached to the inner peripheral surface of the motor frame 11. The upper and lower stator winding ends 55a and 55b protrude from both upper and lower ends of the stator core 52, and these stator winding ends 55a and 55b serve as heat generation sources. Unlike the conventional canned motor, the stator chamber 31 of this embodiment is a space because it does not require resin sealing.

  In the rotor chamber described above, a rotor 61 attached to the rotor main shaft 63 is disposed and supported by the radial bearings 19a and 19b and the thrust bearing 19c. The rotor chamber is filled with the filled liquid 65, which is a countermeasure against external pressure caused by the canned motor 1 itself being submerged in the liquid, and a countermeasure for lubrication and cooling of the bearings 19a, 19b, and 19c. . The rotor 61 is disposed at a position corresponding to the inner peripheral surface of the stator 51 and is rotated by a magnetic force applied from the stator 51. Note that a spline and a key for connecting a rotary shaft (not shown) of the submerged pump is formed at the upper end portion of the rotor main shaft 63.

[Capacitor location]
Next, the installation position of the capacitor 41, which is one of the characteristic points of this embodiment, will be described. In the present embodiment, the capacitor 41 has a cylindrical outer shape and is disposed between the lower stator winding end 55b and the lower frame side plate 13b. In the embodiment of FIG. 1, it is directly fixed on the lower frame side plate 13b. For this reason, the capacitor 41 is disposed in the lower end region of the space of the stator chamber 31. In this respect, it is greatly different from the conventional canned motor. That is, in the conventional canned motor, the capacitor is disposed between the upper frame side plate and the upper stator winding end.

  There are various structures for fixing the capacitor 41 to the lower frame side plate 13b. As an example, it is conceivable to bond the capacitor 41 using an adhesive. Moreover, as shown in FIG. 1, fixing to the lower flame | frame side board 13b with the volt | bolt 43 is also considered. In this case, it is necessary to form a through hole for a bolt in the capacitor 41. By adhering and fixing the capacitor 41 to the lower frame side plate 13b, positioning is facilitated, and radiation heat from the lower stator winding end 55b and heat generated by the capacitor 41 itself can be released to the lower frame side plate 13b. . In that case, it is desirable to use an adhesive having high thermal conductivity. Note that the outer diameter and inner diameter of the capacitor 41 of the present embodiment are set so as not to contact the motor frame 11 and the can 21. However, this is merely an example, and it is possible to employ a structure that contacts at least one of the inner peripheral surface of the motor frame 11 and the outer peripheral surface of the can 21.

[Connector terminal]
A connector terminal 71 is attached to the upper frame side plate 13a. The connector terminal 71 is for supplying power to the stator 51 and the capacitor 41 from an external power source (not shown). Two power lines are connected to the connector terminal 71 of the present embodiment, and the number of power lines is smaller than the type in which the capacitor 41 is installed outside (ground) (minimum of three power lines are required). Can be reduced. In the canned motor 1 shown in FIG. 1, the position of the connector terminal 71 is the same as that of the conventional one, while the position of the capacitor 41 is below the stator 51. For this reason, although the conducting wire connected to the capacitor | condenser 41 needs to pass the stator 51, the detail is mentioned later. Reference numerals 81a and 81b in the figure indicate O-rings for sealing between the upper and lower frame side plates 13a and 13b and the upper and lower brackets 15a and 15b, and reference numeral 83 seals the rotor main shaft. A shaft seal device is shown, and reference numeral 85 denotes a pressure regulator.

[Second Embodiment]
[Insulation structure]
Next, a canned motor 101 according to the second embodiment will be described with reference to FIG. FIG. 2 is a diagram illustrating a heat insulating structure 103 added to the canned motor 1 disclosed in FIG. Here, FIG. 2 (A) is a plan view showing the heat insulating material 111, and FIG. 2 (B) is the heat insulating material 1.
11 is a partial cross-sectional view of a canned motor 101 having a heat insulating structure according to FIG. By disposing the heat insulating material 111 between the lower stator winding end 55b and the lower frame side plate 13b, the influence of radiant heat from the lower stator winding end 55b can be avoided. In particular, if an insulating member is used for the heat insulating material 111, reliable insulation can be obtained.

  Although the material used as the heat insulating material 111 is not specifically limited, For example, what combined the rock wool and aromatic wool to plate shape can be considered. The thickness of the heat insulating material is suitably about 0.5 mm to 1.0 mm in consideration of the problem of space at the installation position and workability. However, it is possible to use even other thicknesses. The heat insulating material 111 has a ring shape so that it can be disposed in the stator chamber 31. And the three leg parts 113 extended toward the center from the internal diameter of the ring-shaped heat insulation main body are provided. As shown in FIG. 2B, the foot 113 is bent into a U shape by a fold line 115. A predetermined gap is formed between the heat insulating material 111 and the capacitor 41 when the heat insulating material 111 is disposed on the capacitor 41.

  The configuration of the foot 113 is an example, and other configurations may be employed. For example, in the above embodiment, the three foot portions 113 are provided, but this is for stabilizing the posture of the heat insulating material 111. Theoretically, the purpose can be achieved even with two foot portions. It is. Of course, four or more feet may be provided. Further, it is possible to form a predetermined gap between the capacitor 41 and the capacitor 41 only by bending it into an L shape instead of bending it into a U shape. Furthermore, it is conceivable to form a foot portion on the outer diameter side instead of the inner diameter of the ring-shaped heat insulating material body.

  Further, a predetermined notch 117a is formed on the outer peripheral portion of the ring-shaped heat insulating material body. This notch 117a is for passing the lead wire connected to the capacitor 41, as will be described later. In this embodiment, the notch 117a is formed in the outer peripheral part of the heat insulating material 111 (solid line in the figure), but may be provided in the inner peripheral part (dotted line in the figure) (reference numeral 117b). Further, the notches 117a and 117b are not limited to one place as shown in the figure, and two or more places may be provided. By doing so, the degree of freedom when assembling the canned motor 101 can be improved.

[Modification of heat insulation structure]
FIG. 3 is a diagram illustrating a modified example of the heat insulating structure 103 disclosed in FIG. 2. As shown in FIG. 3, the heat insulating material 121 of the heat insulating structure 123 has a simple ring shape, and the foot portion 113 as disclosed in FIG. 2 is not provided. On the other hand, two cylindrical members 125 are arranged in the vertical direction in the vicinity of the inner peripheral surface of the motor frame 11, and the heat insulating material 121 is sandwiched between these cylindrical members 125. Since each cylindrical member 125 is sandwiched between the lower surface of the stator 51 and the upper surface of the lower frame side plate 13b, the heat insulating material 121 is sandwiched with a predetermined force. Thereby, the heat insulating material 121 is separated from the capacitor 41 with a predetermined gap and is supported in a constant posture. In FIG. 2, two cylindrical members 125 are shown, but in the case of the embodiment of FIG. 2 in which the feet 113 are provided, it is not essential to provide the cylindrical members 125.

[Capacitor fixing structure]
In addition, the canned motor 101 of the present embodiment is also characterized by a structure in which the capacitor 41 is fixed to the lower frame side plate 13b. That is, as shown in FIG. 3, a stepped recess 127 having a predetermined diameter is formed on the upper surface of the lower frame side plate 13b. The diameter of the stepped recess 127 is substantially equal to the outer diameter of the capacitor 41 so that the capacitor 41 is fitted therein. For this reason, it becomes easy to position the condenser 41 concentrically with respect to the motor frame 11 and the can 21. Further, once the capacitor 41 is fixed to the lower frame side plate 13b, it is not easily detached from the lower frame side plate 13b by the action of the stepped recess 127. The stepped recess 127 is formed in a circular shape, but the structure for positioning the capacitor 41 is not limited to this. For example, even if three or more protrusions are formed along the circumferential direction on the upper surface of the lower frame side plate 13b, it is possible to achieve the same function as the stepped recess 127.

[Circuit motor circuit diagram and detailed wiring diagram]
Next, a circuit diagram applied to the canned motors 1 and 101 will be described with reference to FIGS. The canned motors 1 and 101 according to this embodiment are single-phase PSC motors. The stator windings of the canned motors 1 and 101 are each composed of a set of a main winding 56 and an auxiliary winding 57. A connector terminal 71 for connecting to a primary power supply line (not shown), a protector P for protecting the winding, and a capacitor 41 are connected to the windings 56 and 57 via conductive wires or the like. FIG. 4 is a circuit diagram when the connector terminal 71 and the protector P are connected to the load side (upper) stator winding, and the capacitor 41 is connected to the anti-load side (lower) stator winding. As shown in FIG. 4, the auxiliary winding 57 is connected in parallel with the main winding 56, and the capacitor 41 is connected in series with the auxiliary winding 57.

  FIG. 5 is an example of a specific wiring diagram for realizing the above circuit. FIG. 5 shows four types of detailed wiring diagrams.

  First, in the wiring diagram of FIG. 5A, both ends (1) and (2) of the main winding and one end (3) of the auxiliary winding are taken out to the load side. Then, one end (1) of the main winding and one end (3) of the auxiliary winding are connected to one end (7) of the connector terminal 71 via the protector P. Further, the other end (4) of the auxiliary winding is taken out to the anti-load side, and is connected to the lead wire (6) of the capacitor 41. The other conducting wire (5) of the capacitor 41 is connected to an extending conducting wire (5) ′, and this extending conducting wire (5) ′ passes through the stator 51 and is taken out to the load side. The extension wire (5) ′ taken out to the load side is connected to one end (2) of the main winding and one end (8) of the connector terminal 71.

  Next, in the wiring diagram of FIG. 5B, one end (1) of the main winding and one end (3) of the auxiliary winding are taken out to the load side, and one end (7) of the connector terminal 71 is connected via the protector P. It is connected to. The other end (2) of the main winding is taken out to the side opposite to the load and is connected to the conducting wire (5) of the capacitor 41 and the extending conducting wire (8) ′. The extension conducting wire (8) ′ passes through the stator 51 and is taken out to the load side, and the extension conducting wire (8) ′ taken out to the load side is connected to one end (8) of the connector terminal 71. The other end (4) of the auxiliary winding is taken out to the side opposite to the load, and is connected to the conducting wire of the other end (6) of the capacitor 41.

  Next, in the wiring diagram of FIG. 5C, both ends (1) and (2) of the main winding and both ends (3) and (4) of the auxiliary winding are taken out to the load side. Then, one end (1) of the main winding and one end (3) of the auxiliary winding are connected to one end (7) of the connector terminal 71 via the protector P. The other end (2) of the main winding and the other end (8) of the connector terminal 71 are connected to the extension conductor (5) ′. Further, the extension conducting wire (5) ′ passes through the stator 51 and is taken out to the non-load side, and is connected to one end (5) of the conducting wire of the capacitor 41. The other end (4) of the auxiliary winding is connected to an extension lead wire (6) ′, and the extension lead wire (6) ′ passes through the stator 51 and is taken out to the non-load side. Connected with (6).

Furthermore, in the wiring diagram of FIG. 5D, both ends (1) and (2) of the main winding and both ends (3) and (4) of the auxiliary winding are taken out to the non-load side. An extension conducting wire (7) ′ is connected to one end (1) of the main winding and one end (3) of the auxiliary winding. The extension conducting wire (7) ′ passes through the stator 51 and is taken out to the load side, and is connected to one end (7) of the connector terminal 71 via the protector P. The other end (2) of the main winding and one end (5) of the capacitor 41 are connected to the extension conductor (8) ′. Lead wire for extension (8)
'Passes through the stator 51 and is taken out to the load side, and is connected to the other end (8) of the connector terminal 71. The other end (4) of the auxiliary winding and the other conductor (6) of the capacitor 41 are connected.

[Conductor structure for conducting wire]
Next, a structure in which the conducting wire 59 passes through the stator 51 (more correctly, the stator core) will be described with reference to FIG. As shown in FIG. 6, the stator core 52 has a stator core slot 58a formed along the inner peripheral surface, and a notch 58b formed at a predetermined location on the outer peripheral surface. The stator core slot 58 a and the notch 58 b penetrate along the longitudinal direction of the stator core 52.

  The stator core slot 58 a is a space through which the stator winding 55 passes and opens toward the outer peripheral surface of the can 21. Normally, the stator winding 55 passes through the entire cross section of the stator core slot 58a. However, in the stator core 52 of the present embodiment, a certain gap space is formed by reducing the number of stator windings 55 in some of the stator core slots 58a. The lead wire 59 passes through this gap space. Further, the notch 58b on the outer peripheral surface of the stator core is also a space that can be used for allowing the conductor 59 to pass therethrough. When this notch 58b is used, it is not necessary to reduce the number of stator windings 55 as in the case where the stator core slot 59a is used, so that a reduction in efficiency of the canned motors 1 and 101 can be prevented. 6 shows an example in which the conductors 59 pass through the stator core slot 58a and the notch 58b, respectively, but in an actual aspect, one or two conductors 59 are passed through one stator core slot 58a. In the case of passing two conductors 59 through the two stator core slots 58a one by one, passing one or two conductors 59 through one notch 58b, two conductors 59 through the two notches 59b. There are various cases in which one conductor is passed through one stator core slot 58a and one conductor 59 is passed through one notch 58b.

[Capacitor]
FIG. 7 shows a cylindrical capacitor 41 used in the canned motors 1 and 101 of this embodiment. Even when the capacitance is changed, the inner and outer diameters of the capacitor do not change, and only the dimension in the longitudinal direction changes. The outer shell of the capacitor 41 is made of plastic.

[Submersible pump]
The above canned motors 1 and 101 can be used by being connected to a submersible pump for deep wells, for example. That is, the canned motors 1 and 101 can be connected to the lower end of the submerged pump to apply a driving force to the submerged pump.

  The canned motor of the present invention can be used as a motor for applying a driving force to a submerged pump, particularly a submerged pump for deep wells.

1, 101 Canned motor 11 Motor frame 13a Upper frame side plate (load side)
13b Lower frame side plate (anti-load side)
15a Upper bracket (load side)
15b Lower bracket (anti-load side)
17a bolt (load side)
17b Bolt (anti-load side)
19a Radial bearing (load side)
19b Radial bearing (anti-load side)
19c Thrust bearing 21 Can 31 Stator chamber 41 Capacitor 43 Screw 51 Stator 55 Stator winding 55a Upper stator winding end (load side)
55b Lower stator winding end (anti-load side)
58a Stator core slot 58b Notch 59 Conductor 61 Rotor 63 Rotor main shaft 65 Filled liquid 71 Connector terminal 81a O-ring (load side)
81b O-ring (anti-load side)
83 Shaft seal device 85 Pressure regulating mechanism 111, 121 Heat insulation material 113 Foot 127 Stepped recess

Claims (10)

A canned motor with a built-in capacitor for driving a submerged pump,
A cylindrical motor frame and a cylindrical can installed inside the motor frame,
The stator and the capacitor are installed in a stator chamber between the motor frame and the can, and the capacitor is disposed below the stator ,
An upper frame side plate for sealing the upper end opening is fixed to the upper end of the stator chamber, and a connector terminal for power supply is attached to the upper frame side plate,
The connector terminal and the capacitor are directly connected by at least one conducting wire, and the conducting wire passes through the stator .   The canned motor according to claim 1, wherein the capacitor is fixed to a lower frame side plate for sealing a lower end opening of the stator chamber.   The canned motor according to claim 2, wherein the capacitor is fixed to the lower frame side plate by an adhesive or a screw.   The canned motor according to any one of claims 1 to 3, wherein a ring-shaped heat insulating material is provided between the capacitor and the stator.   The canned motor according to claim 4, wherein the heat insulating material is made of an insulating material.   The canned motor according to claim 4, wherein the heat insulating material includes a foot portion for maintaining a gap with respect to the capacitor.   The canned motor according to any one of claims 4 to 6, wherein the heat insulating material is sandwiched and fixed between two cylindrical members disposed between the capacitor and the stator. The stator, the stator core slot or a stator core outer circumferential portion notch portion is formed, at least one of the conductors of the stator core slots or notches is passing, according to any one of claims 1 to 7 Canned motor. The capacitor has a donut shape, and a stepped recess having a diameter corresponding to the outer diameter of the capacitor is formed on the upper surface of the lower frame side plate for sealing the lower end opening of the stator chamber . The canned motor according to any one of claims 1 to 8 . A submerged pump comprising the canned motor according to any one of claims 1 to 9 and a pump body coupled to the canned motor.

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