JP2016181951A - motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection mode of a power cable with a coil, capable of miniaturizing a motor and exchanging the power cable by a simple work for high design flexibility.SOLUTION: The motor includes: a casing; a stator 104 fixed in the casing; a coil 108 formed by winding an insulation-coated electric wire around the stator 104; a rotor 106 disposed to face the stator 104; and a terminal block 210 embedded with a terminal 250 for electrically connecting a power cable 112 connected with an external power supply of the casing, with the coil 108, and further includes a connection member 200 which makes the power cable 112 detachable.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a motor.

  Conventionally, submersible pumps are used to pump water in wells and pools. In order to pump up water using a submersible pump, a motor that drives the submersible pump is used. For example, in a deep well, a submersible motor that drives a submersible pump in a submerged state is used (for example, Patent Document 1).

  The submersible motor includes a cylindrical motor frame, a stator fixed in the motor frame, a coil wound around the stator, and a rotor provided inside the stator. The submersible motor also includes a main shaft attached to the rotor and brackets that cover both ends of the motor frame. An enclosed liquid (for example, water) is enclosed in the motor frame in order to cool the submersible motor and improve slidability.

  The submersible motor rotates the rotor by energizing the coil. That is, the coil is connected to a power cable for energizing the coil from a power supply external to the submersible motor. An underwater motor rotates a rotor within a motor frame using electromagnetic induction by energization of a coil. The main shaft rotates as the rotor rotates.

  There are various types of coils used in submersible motors. As an example, there is a case where a coil obtained by winding an electric wire with an insulating coating around a stator is used. In this case, the conventional technology molds all of the U-phase, V-phase, and W-phase electric wires of the power cable and the U-phase, V-phase, and W-phase three wires of the coil together inside the motor frame. As a result, the coil and the power cable were connected.

JP 59-123439 A

  However, in the prior art, the power cable, for example, the U-phase, V-phase, and W-phase three wires and the coil, for example, the U-phase, V-phase, and W-phase three wires, are all molded together inside the motor frame. Therefore, the volume of the mold was large. If the volume of the mold is large, the motor becomes large, which is not preferable. Thus, an object of one embodiment of the present invention is to realize a connection mode between a power cable and a coil that can reduce the size of a motor.

  In the prior art, since the power cable and the coil are fixedly connected by molding, they cannot be easily removed. Therefore, if the power cable is damaged, the connection with the coil must be cut and the new power cable must be reconnected and molded in order to replace the power cable. is there. In view of this, an object of one embodiment of the present invention is to realize a connection mode between a power cable and a coil, which allows the power cable to be replaced with a simple operation.

Further, in the prior art, a method of crushing rubber packing has been adopted in order to seal the extracted part of the power cable taken out from the mold. However, in this system, there are cases where sufficient sealing performance cannot be exhibited unless the material of the sheath of the power cable is a soft rubber system. For this reason, it is difficult to use a power cable having an inexpensive but hard vinyl-based sheath, and there is a risk that the degree of freedom in design may be reduced. Accordingly, an object of one embodiment of the present invention is to realize a connection mode between a power cable and a coil that can improve the degree of freedom in design.

  The present invention has been made to solve at least one of the plurality of problems described above.

  A motor according to an aspect of the present invention includes a casing, a stator fixed in the casing, a coil formed by winding an electric wire with an insulating coating around the stator, and the stator. And a terminal block in which terminals for electrically connecting the coil and a power cable connected to a power source outside the casing are embedded, and the power cable is detachable A connection member.

  In one embodiment of the motor, the terminal block may have a trumpet-shaped protruding portion that protrudes while gradually reducing the diameter from the terminal block toward the coil at a lead wire portion to which the coil is connected. Good.

  In one embodiment of the motor, the protrusion may be covered with a heat-shrinkable tube or an insulating tape.

  In one aspect of the motor, the casing includes a cylindrical motor frame, a first side plate provided at a first end of the motor frame, and a second side plate provided at a second end of the motor frame. The motor further includes a terminal block pressing plate for fixing the terminal block to the first side plate or the second side plate, and the terminal block is for alignment with the terminal block pressing plate. It has a projection, and the terminal block pressing plate may have a hole or a notch formed corresponding to the shape of the projection.

  In one aspect of the motor, the terminal block may be formed of a thermoplastic rubber and may have a flange formed at a portion where the terminal block pressing plate abuts.

  In one embodiment of the motor, the terminal block is made of thermoplastic rubber and has a tapered shape that gradually decreases in diameter from a portion where the terminal block pressing plate abuts toward a side where the power cable is connected. May be.

  According to the motor of one form, since the power cable and the coil are connected by the connecting member to which the connector of the power cable can be attached and detached, it is not necessary to perform connection by molding. As a result, according to one embodiment of the motor, since the mold having a large volume is not used, the motor can be reduced in size.

  Moreover, according to the motor of one form, since a power cable and a coil are connected by the connection member which can attach or detach the connector of a power cable, a power cable can be replaced | exchanged by easy operation | work.

Moreover, according to the motor of one form, there is no restriction | limiting that the material of the cable sheath of a power cable must be a soft rubber type. As a result, according to one embodiment of the motor, a power cable having an inexpensive vinyl-based cable sheath can be used, and the degree of design freedom can be improved.

FIG. 1 is a diagram illustrating an appearance of the submersible motor pump according to the present embodiment. FIG. 2 is a view showing a cross section of the submersible motor of the present embodiment. FIG. 3 is a partially enlarged view for explaining details of the connection member according to the embodiment. Drawing 4 is a figure for explaining the composition of the terminal block and terminal block pressing board in the connecting member of one embodiment. FIG. 5 is a partially enlarged view for explaining details of the connection member according to the embodiment.

  Hereinafter, a motor according to an embodiment of the present invention will be described with reference to the drawings. Although the following embodiment demonstrates a submersible motor as an example, it is not restricted to this.

  FIG. 1 is a diagram illustrating an appearance of the submersible motor pump according to the present embodiment. As shown in FIG. 1, the submersible motor pump 500 includes a submersible motor 100 and a submersible pump 300 connected to the submersible motor 100.

  The submersible pump 300 has a drive shaft 302 connected to the main shaft 110 of the submersible motor 100 and a plurality of blades 304 attached to the drive shaft 302. In the submersible pump 300, the drive shaft 302 and the blades 304 rotate as the main shaft 110 of the submersible motor 100 rotates, thereby pumping up water.

  Next, details of the submersible motor 100 of the present embodiment will be described. FIG. 2 is a view showing a cross section of the submersible motor of the present embodiment.

  As shown in FIG. 2, the submersible motor 100 includes a casing 101. The casing 101 includes a cylindrical motor frame 102, an anti-load side frame side plate (first side plate) 122, a load side frame side plate (second side plate) 131, a first bracket 120, and a second bracket 130. The submersible motor 100 includes a stator 104 fixed in the motor frame 102, a rotor 106 provided inside the stator 104, and a main shaft 110 attached to the rotor 106.

  The underwater motor 100 includes a coil 108 wound around the stator 104. The coil 108 is formed by winding an electric wire with an insulating coating around the stator 104. The submersible motor 100 also includes a connection member 200 for connecting a power cable 112 extending from a power source (not shown) outside the submersible motor 100 and the coil 108. In other words, the power cable 112 for energizing the coil 108 is connected to the coil 108 via the connection member 200. The connection member 200 has a terminal for electrically connecting the power cable 112 and the electric wire on which the coil 108 is coated with an insulating coating. The connection member 200 can be attached and detached from the power cable 112. The rotor 106 rotates in the motor frame 102 by electromagnetic induction caused by energization of the coil 108. The main shaft 110 rotates as the rotor 106 rotates.

  The first bracket 120 is provided so as to cover the first end (the end on the anti-load side) on the side where the submersible pump 300 is not connected. Specifically, the anti-load side frame side plate 122 is provided at the first end of the motor frame 102, and the first bracket 120 is fixed to the anti-load side frame side plate 122 by bolts 184.

On the other hand, the second bracket 130 is provided so as to cover the second end (load-side end) on the side to which the submersible pump 300 is connected. Specifically, the load side frame side plate 131 is provided at the second end portion of the motor frame 102, and the second bracket 130 is fixed to the load side frame side plate 131 by bolts 194.

  In the submersible motor 100, a sealing liquid 114 (for example, water) is enclosed in order to cool the heat generated from the submersible motor 100 and improve the slidability of the main shaft 110.

  A diaphragm 182 that absorbs pressure fluctuations in the submersible motor 100 is provided on the opposite side of the submersible motor 100. A radial bearing 188 for rotationally driving the main shaft 110 is provided on the opposite side of the submersible motor 100. The main shaft 110 is supported by a radial bearing 188 attached to the first bracket 120.

  On the other hand, a radial bearing 198 for rotationally driving the main shaft 110 is provided on the load side of the submersible motor 100. The main shaft 110 is supported by a radial bearing 198 attached to the second bracket 130.

  A through-hole through which the main shaft 110 can be penetrated is formed at the center of the second bracket 130 in order to project the tip of the main shaft 110 to the outside of the submersible motor 100. The main shaft 110 protrudes to the outside of the submersible motor 100 through the through hole and is connected to the drive shaft 302 of the submersible pump 300.

  The submersible motor 100 includes a shaft seal mechanism 150 provided in the through hole portion. The shaft sealing mechanism 150 suppresses leakage of the sealing liquid 114 to the outside of the submersible motor 100 through the through hole. Further, the shaft seal mechanism 150 suppresses water outside the submersible motor 100 from entering the submersible motor 100.

  Next, details of the connection member 200 will be described. FIG. 3 is a partially enlarged view for explaining details of the connection member 200 according to the embodiment. In FIG. 3, the connecting member 200 and the power cable 112 are partially drawn in cross section.

  As shown in FIG. 3, the connection member 200 includes a terminal block 210 in which a terminal 250 for electrically connecting the power cable 112 and the electric wire covered with the coil 108 is embedded. The connector of the power cable 112 is fixed to the terminal block 210 by a cable holding plate 260. In the present embodiment, the power cable 112 is detachable from the terminal block 210. An electric wire of the power cable 112 is connected to the first end of the terminal 250 provided in the terminal block 210.

  On the other hand, the lead wire 220 to which the electric wire with the insulation coating of the coil 108 is connected is connected to the terminal block 210. Specifically, the insulated end of the coil 108 is connected to the second end of the terminal 250 provided inside the terminal block 210. As a result, the power cable 112 and the coil 108 are electrically connected. Note that the first end and the second end of the terminal 250 are formed by male spin or female spin.

According to the present embodiment, since it is not necessary to connect the power cable 112 and the coil 108 with the rubber mold inside the submersible motor 100, a troublesome pressing operation is not required. That is, in the conventional method, when connecting the power cable 112 and the water-resistant electric wire (electric wire with insulation coating) of the coil 108, the connection is made inside the motor frame 102. For this reason, since the power cable 112 (for example, three cores of U, V, and W) and the wires (U, V, and W) of each phase of the coil 108 are all molded together, the volume of the rubber mold is inevitable. It was a big thing. On the other hand, according to the present embodiment, since the power cable 112 and the coil 108 are connected using the terminal block 210, it is not necessary to store a rubber mold having a large volume inside the underwater motor 100. Therefore, according to this embodiment, compared with the prior art, the motor mold liquid is increased by the amount of space in the rubber mold, or the total length of the submersible motor 100 is shortened by the amount of space in the rubber mold. Can be. Furthermore, in the connector cable system of the present embodiment, since the connecting portion of the power cable 112 is positioned inside the load side frame side plate 131, the metal load side frame side plate 131 is used for the seal structure. Ensuring strength and reducing space can be achieved. In the present embodiment, the terminal block 210 is provided in a hole formed in the load side frame side plate 131, but is not limited thereto. The terminal block 210 may be provided in other places, such as the anti-load side frame side plate 122, for example.

  Moreover, the submersible motor 100 of this embodiment can improve the communal property of components by diverting the existing power cable for canned motors. That is, when the existing canned motor is replaced with the submersible motor 100 of the present embodiment, the power cable 112 can be used by simply replacing the motor portion. Specifically, if an existing power cable to which an extension cable of several hundred meters is connected is removed from the existing canned motor and connected to the underwater motor 100 of this embodiment, the power cable can be used as it is. .

  Further, in the conventional rubber mold method, since the power cable is directly connected to the water-resistant electric wire of the coil, it is difficult to remove it. If the power cable 112 is damaged, in order to replace the power cable 112, the connecting portion between the power cable 112 and the water-resistant wire is disassembled, the connecting portion is disconnected, and a new power cable is connected again to a rubber mold. I had to mold. On the other hand, according to the submersible motor 100 of this embodiment, the power cable 112 can be attached to and detached from the terminal block 210. Therefore, according to the submersible motor 100 of the present embodiment, it is only necessary to disconnect the old power cable from the terminal block 210 and plug the new power cable into the terminal block 210, so the work is simplified. Moreover, according to the submersible motor 100 of this embodiment, it becomes possible to handle the power cable 112 and the submersible motor 100 separately. Therefore, it is possible to contribute to improvement in workability during assembly and transportation of the submersible motor 100 and space saving during storage of the submersible motor 100.

  Further, in a conventional poly-winding motor in which a coil is formed by a water-resistant electric wire, a method in which a rubber packing is crushed has been adopted as a seal of a take-out portion of a power cable. However, in this method, since the cable sheath cannot be made of a soft rubber material, a sufficient sealing performance cannot be exhibited. Therefore, it is difficult to use a vinyl material which is inexpensive but has a hard sheath. On the other hand, according to the submersible motor 100 of this embodiment, there is no restriction that the material of the cable sheath of the power cable 112 must be a soft rubber system. As a result, according to the submersible motor 100 of the present embodiment, since the power cable 112 having an inexpensive vinyl-based cable sheath can be used, the cost can be reduced and the design flexibility can be improved. Can be made.

  Moreover, the terminal block 210 of the submersible motor 100 of this embodiment is formed of thermoplastic rubber (elastomer). Therefore, according to the underwater motor 100 of this embodiment, the sealing performance between the terminal block 210 and the lead wire 220 can be improved.

That is, the conventional canned motor terminal block has conventionally used engineering plastics or the like, but this terminal block has not been considered for sealing with the lead wire. This is because the canned motor does not need to consider the sealing property of the terminal block because the conductive sealing liquid such as water is not sealed around the terminal block. On the other hand, in a poly-winding motor in which a coil is formed by a water-resistant electric wire as in this embodiment, it is required to consider the sealing performance of the terminal block. According to this embodiment, since the terminal block 210 is formed of thermoplastic rubber, a sealing effect is obtained by compression of rubber between the terminal block 210 and the lead wire 220, and the sealed liquid 114 of the submersible motor 100 is transferred to the terminal block. Intrusion into 210 can be prevented. As the lead wire 220, a cross-linked polyethylene insulated wire or a fluororesin insulated wire can be used.

  Moreover, the submersible motor 100 of the present embodiment includes a terminal block pressing plate 230 for fixing the terminal block 210 to the load side frame side plate 131. The terminal block holding plate 230 abuts on the terminal block 210 and pushes in the terminal block 210, and is fixed to the load side frame side plate 131 with a bolt or the like, thereby fixing the terminal block 210 to the load side frame side plate 131. The terminal block 210 has a flange (collar portion) 270 formed at a portion where the terminal block pressing plate 230 abuts. According to the submersible motor 100 of the present embodiment, since the flange 270 is formed of thermoplastic rubber, the sealing performance can be improved by crushing the flange 270 with the terminal block pressing plate 230. That is, the conventional terminal block is a seal with a wire using an O-ring, but according to the present embodiment, a higher sealing performance is ensured by sealing with the surface of the flange 270 of the terminal block 210 of thermoplastic rubber. can do.

  When molding the terminal block 210 made of thermoplastic rubber, an adhesive is applied in advance to the lead wire 220 to improve the adhesion between the terminal block 210 and the thermoplastic rubber, thereby improving the sealing performance.

  Further, the terminal block 210 is a trumpet-shaped protruding portion that protrudes while gradually reducing the diameter from the terminal block 210 toward the coil 108 at the portion of the lead wire 220 to which the wire coated with the insulation coating of the coil 108 is connected. 222 is formed. The protrusion 222 is covered with a heat-shrinkable tube 224.

  The connection between the terminal block 210 and the coil 108 is made from the lead wire 220 (for example, three wires U, V, and W per one terminal block 210) from each terminal block 210 and each phase of the coil 108. Water resistant wires can be connected individually. In addition, a simple method in which the protruding portion 222 is waterproofed by the heat shrinkable tube 224 can be employed for the connection instead of the rubber mold. Instead of the heat shrinkable tube 224, an insulating tape can be put on the protruding portion 222. Thereby, according to this embodiment, it becomes possible to reduce the volume of a connection part. Further, according to the submersible motor 100 of the present embodiment, the protrusion 222 is provided, and the heat-shrinkable tube with adhesive or the insulating tape having a high waterproofing effect is placed between the protrusion 222 and the lead wire 220, so that a higher airtightness is achieved. It becomes possible to have sex.

  FIG. 4 is a view for explaining the configuration of the terminal block 210 and the terminal block pressing plate 230 in the connection member 200 of the embodiment. FIG. 4 is a schematic diagram of a part of a cross section obtained by cutting a portion where the terminal block pressing plate 230 of the submersible motor 100 in FIG. 3 is installed by a plane orthogonal to the extending direction of the main shaft 110.

As described above, the terminal block holding plate 230 is used to fix the terminal block 210. That is, the terminal block 210 is formed with a flange 270. The terminal block pressing plate 230 abuts on the flange 270 so as to crush the flange 270. Here, as shown in FIG. 4, the terminal block 210 is provided with one protrusion 240 (convex portion) for alignment with the terminal block pressing plate 230. Further, the terminal block holding plate 230 is formed with a notch 290 (concave portion) or a hole corresponding to the shape of the protrusion 240 of the terminal block 210. The terminal block holding plate 230 has a shape that matches the arc of the outer periphery of the submersible motor 100. By aligning the position of the protrusion 240 of the terminal block 210 with the notch 290 of the terminal block holding plate 230, it is possible to correctly connect the phases of the power cable 112 and the coil 108 without misplacement of the terminal block 210. It becomes. The terminal block pressing plate 230 is fixed to the load side frame side plate 131 by, for example, bolts 292. As a result, the terminal block 210 is fixed to the load side frame side plate 131.

  In addition, although the connection member 200 shown in FIG. 3 showed the example in which the flange 270 was formed in the terminal block 210, it is not limited to this. FIG. 5 is a partially enlarged view for explaining details of the connection member according to the embodiment. In FIG. 5, the connecting member 200 and the power cable 112 are partially drawn in cross section. The connecting member 200 of the embodiment shown in FIG. 5 is different in that instead of forming the flange 270 on the terminal block 210, the terminal block 210 is formed in a tapered shape. The description of the same configuration as that of the embodiment of FIG. 3 is omitted.

  As shown in FIG. 5, the terminal block 210 has a tapered shape 280 that gradually decreases in diameter from the portion where the terminal block pressing plate 230 abuts toward the side to which the power cable 112 is connected. Correspondingly, a hole having a tapered shape corresponding to the tapered shape 280 of the terminal block 210 is formed in the load side frame side plate 131. The terminal block 210 is inserted into the hole of the load side frame side plate 131. The terminal block 210 is fixed to the load side frame side plate 131 by tightening and crushing the terminal block pressing plate 230 with a screw.

  According to the present embodiment, since the entire tapered shape 280 of the terminal block 210 is compressed by pushing and fixing the tapered terminal block 210, the embodiment of FIG. 3 in which only the surface is compressed. High sealing performance can be exhibited. Furthermore, not only the seal on the outer periphery of the terminal block 210 but also the male pins inside the terminal block 210 and the lead wires 220 are brought into close contact with the thermoplastic rubber of the terminal block 210 due to inward compression. The inside can also exhibit high sealing performance. As a result, it becomes possible to further prevent water outside the submersible motor 100 or the sealed liquid 114 inside the submersible motor 100 from entering the terminal block 210.

DESCRIPTION OF SYMBOLS 100 Submersible motor 101 Casing 102 Motor frame 104 Stator 106 Rotor 108 Coil 110 Main shaft 112 Power cable 114 Filled liquid 122 Anti-load side frame side plate 131 Load side frame side plate 200 Connection member 210 Terminal block 220 Lead wire 222 Protruding part 224 Thermal contraction Tube 230 Terminal block holding plate 240 Projection 250 Terminal 270 Flange 280 Taper shape

Claims (6)

A casing,
A stator fixed in the casing;
A coil formed by winding an electric wire with an insulating coating around the stator;
A rotor disposed opposite the stator;
A power supply cable connected to a power supply outside the casing and a terminal block in which a terminal for electrically connecting the coil is embedded, and a connection member to which the power supply cable is detachable;
Motor with. The motor according to claim 1,
The terminal block is formed with a trumpet-shaped protrusion that protrudes while gradually reducing the diameter from the terminal block toward the coil at the lead wire portion to which the coil is connected.
motor. The motor according to claim 2,
The protrusion is covered with a heat-shrinkable tube or insulating tape,
motor. The motor according to any one of claims 1 to 3,
The casing includes a cylindrical motor frame, a first side plate provided at a first end of the motor frame, and a second side plate provided at a second end of the motor frame,
The motor further includes a terminal block pressing plate for fixing the terminal block to the first side plate or the second side plate,
The terminal block has a protrusion for alignment with the terminal block pressing plate,
The terminal block retainer plate has a hole or notch formed corresponding to the shape of the protrusion,
motor. The motor according to claim 4,
The terminal block is made of thermoplastic rubber, and has a flange formed at a portion with which the terminal block pressing plate abuts.
motor. The motor according to claim 4,
The terminal block is made of thermoplastic rubber, and has a tapered shape that gradually decreases in diameter from the portion with which the terminal block pressing plate abuts toward the side to which the power cable is connected.
motor.

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