JPH11166500A - Pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the cooling performance for components of the control circuit of a pump, in particular components emitting a large quantity of heat such as a power IC, and the stator. SOLUTION: A permanent magnet type rotor 6 of a motor 1 is formed as a molded rotor B from a resin, and at least part of a control circuit E and a certain part of the stator 2, at least its coil 4, are formed through a resin molding process to accomplish a molded stator A, and at least part of the passage for fluid is formed from the molded stator A. The fluid sucked in from a suction hole 14 flows in contact with the stator A and rotor B, and thus they are cooled down.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump in which a pump and a motor are integrated, and more particularly to a pump having improved cooling performance.

[0002]

The pump is constructed by integrating a pump and a motor for driving the pump. For example, the pump disclosed in Japanese Patent Application Laid-Open No. H8-42482 covers a can to which a motor stator is mounted on the outside with an outer case, and rotatably provides a rotor having an impeller integrally inside the can. Then, the lid portion of the outer case is configured as a pump casing,
A control circuit for driving the motor is disposed between the can and the outer case.

However, in this pump, since the stator is disposed between the can and the outer case, there is a problem that cooling performance is poor and motor efficiency is poor. In addition, since the control circuit is also disposed in the enclosed space between the can and the outer case, the cooling performance of the electronic components constituting the control circuit, particularly the heat-generating components such as the power IC, is poor, and the performance may decrease due to a rise in temperature. Cause problems.

Therefore, the present invention can improve the cooling performance of the stator, and can improve the control circuit, especially the power IC.
It is an object of the present invention to provide a pump capable of improving the cooling performance of a heat-generating component such as the above.

[0005]

In order to achieve the above object, a pump according to the present invention is provided with a motor having a stator having a plurality of coils and a rotor of a permanent magnet type, and a rotor provided in the motor. An impeller, and a control circuit for controlling the energization of the coil of the motor, and a resin-molded permanent magnet rotor of the motor to form a molded rotor, and at least a part of the control circuit and the stator In this case, at least the coil is resin-molded to form a molded stator, and the molded stator constitutes at least a part of a passage of a fluid sucked and discharged by the impeller.

According to the above configuration, since the mold stator forms at least a part of the fluid passage, it is cooled by the fluid flowing through the passage, and the coil and the components of the control circuit are resin-molded in the mold stator. Is also cooled by the fluid flowing through the passage.

A motor having a stator having a plurality of coils, a rotor made of a pound magnet in which magnetic powder is mixed into resin to make the magnetic powder permanent, and an impeller provided on the rotor of the motor And a control circuit for controlling the energization of the coil of the motor, at least a part of the control circuit and at least the coil of the stator is resin-molded to form a molded stator, and the molded stator is At least a part of the passage of the fluid sucked and discharged by the impeller may be formed, and the same effect as described above can be obtained in this case.

[0008] Among the components of the control circuit, the component molded by the molding resin of the mold stator is preferably a heat-generating component such as a power element. According to the present invention, the molded stator may have a configuration in which a portion where the stator is molded and a portion where the components of the control circuit are molded are separated from each other, and both are electrically connected by a waterproof connector ( Claim 4). It is preferable that the resin in which the components of the stator, the rotor and the control circuit are molded is a resin having a high thermal conductivity.

It is preferable that the surface of a portion of the molded body in which the parts of the mold rotor, the stator and the control circuit are molded with the molding resin, which faces the fluid passage, is formed in an uneven shape. Item 6). The components of the control circuit molded in the mold
It is preferable to dispose it near the fluid passage (claim 7). In the present invention, the storage space of the mold rotor is communicated with the fluid passage, and the components of the control circuit resin-molded on the mold stator can be arranged so as to face the gap between the mold stator and the mold rotor. (Claim 8).

A heat radiation member can be attached to the control circuit component molded in the mold body. The heat dissipating member is preferably provided at a portion facing a passage through which the fluid passes (claim 10). Further, the heat radiating member can be exposed in a passage through which the fluid passes.
1). An axially extending fluid passage can be formed in the mold rotor (claim 12). The mold stator can be covered by the outer case, and a fluid passage can be formed between the mold stator and the outer case.

The permanent magnet of the rotor is divided into a plurality of parts, the divided permanent magnets are arranged with a gap therebetween, and the resin molded with the rotor is molded without closing the gap between the divided permanent magnets. (Claim 1)
4). The gap between the divided permanent magnets can be formed to be inclined in the axial direction or spiral. The stator coil is mounted on the stator core with a gap between them, and the resin that molds the stator is:
It is preferable to mold without closing the gap between the coils.

[0012] The permanent magnet can be formed of a rare earth element. The rotor can be provided with fins located on the side opposite to the side on which the impeller is provided (claim 18). The rotor shaft can be formed integrally with the mold resin, and the resin shaft can be rotatably supported by the ceramic bearing. In this case, the ceramic bearing can be constituted by a ball bearing. Further, the ball of the ball bearing can be a direct ball bearing that directly contacts the resin shaft.

[0013] The rotor may be configured to be rotatably supported by the fluid (claim 22). A coil is wound around a bobbin, a terminal for connecting a terminal of the coil is provided on the bobbin, and the terminal can connect the coil to a wiring board. A temperature sensor is provided, and energization of the coil can be controlled according to the temperature detected by the temperature sensor. It is also possible to provide a flow rate sensor for detecting the flow rate of the fluid, and to control the energization of the coil according to the flow rate detected by the flow rate sensor.
5).

[0014]

FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG. The stator 2 of the motor 1 is configured by mounting a plurality of coils 4 on a stator core 3. The stator 2 is molded with a resin 5 except for the inner peripheral portion of the stator core 3. The resin-molded stator 2 constitutes a molded stator A.

On the other hand, a rotor 6 of the motor 1 has a plurality of permanent magnets 8
Is mounted as a permanent magnet type rotor. The rotor 6 is entirely molded with a resin 10 with a metal shaft 9 inserted through the center of the rotor core 7.
The mold rotor B is configured. Here, as the resins 5 and 10 of the mold stator A and the mold rotor B,
A resin having high thermal conductivity, for example, an acrylic resin is used. Further, the permanent magnet 8 is made of a rare-earth material, so that it can be magnetized more strongly and the motor output can be increased.

A casing cover 11 made of resin is mounted on the upper portion of the mold stator A. A pump casing 12 is constituted by the casing cover 11 and the molded stator A. A suction port 13 is formed in the center of the casing cover 11, and a mating surface between the casing cover 11 and the molded stator A is formed. A discharge port 14 extending radially outward from the pump casing 12 is formed.

The internal space C of the mold stator A is
It has a cylindrical shape with a bottom and communicates with the internal space D of the pump casing 12. The mold rotor B is housed in the internal space C of the mold stator A. The lower end of the shaft 9 of the mold rotor B is rotatably inserted into and supported by a shaft support hole 15 formed in the mold resin 5 of the mold stator A, and the upper end of the shaft 9 is formed by the suction port 12 of the casing cover 11. It is rotatably inserted and supported in a shaft support hole 17 of a support frame 16 formed therein.

A plurality of vanes 18 located in the pump casing 12 are integrally provided on an outer peripheral portion of an upper end, which is one end of the resin 10 on which the rotor 6 is molded, and the vanes 18 are provided. The upper end of the molded rotor B constitutes an impeller 19. When the mold rotor B rotates, the vane 18 of the impeller 19 performs a pump operation in which a fluid, for example, a liquid such as water is sucked into the pump casing 12 from the suction port 13 and discharged from the discharge port 14.

At this time, since the internal space C of the mold stator A is continuous with the internal space D of the pump casing 12, a part of the liquid flowing in the pump casing 12
It also flows into the internal space C of the mold stator A. Therefore, the internal space C of the mold stator A forms a part of a liquid passage. When the liquid flows through the space C, the mold stator A and the mold rotor B are cooled by the liquid. To improve the cooling efficiency, the inner surface of the mold stator A and the outer surface of the mold rotor B are , Are formed in an uneven shape.

The motor 1 is constructed as a brushless motor DC motor. The energization of the coil 4 is controlled by a control circuit E composed of a number of electronic components 21 mounted on a printed wiring board 20. The printed wiring board 20 is molded together with the stator 2 by the resin 5 of the molded stator A. The mold position of the printed wiring board 20 is set near the upper end of the mold stator A. Among them, the electronic component 21a having a large heat generation, such as a power IC, is arranged at a position constituting the discharge port 14. ing.

Next, the operation of the above configuration will be described. When the coils 4 of a plurality of phases are energized in a predetermined order under the control of the control circuit E, the mold rotor B rotates. Then, the liquid flows from the suction port 13 to the internal space D of the pump casing 12 by the impeller 19 integrated with the mold rotor B.
And is discharged from the discharge port 14 as a high-pressure fluid.

The liquid sucked into the pump casing 12 also flows into the internal space C of the mold stator A, and cools the mold stator A and the mold rotor B.
As a result, the stator 2, the electronic components 21 on the printed wiring board 20, and the rotor 6 are cooled, so that it is possible to prevent a decrease in motor efficiency due to a rise in temperature thereof. At this time, since the mold resins 5 and 10 have excellent thermal conductivity, the amount of heat released from the stator 2, the electronic component 21, and the rotor 6 to the liquid via the resins 5 and 10 is increased, and the cooling performance is improved. Further improvement can be achieved. Moreover, since the inner peripheral surface of the mold stator A and the outer peripheral surface of the mold rotor B are formed in an uneven shape, the area in contact with the liquid is increased, and the cooling performance is further improved.

Further, since a large amount of liquid passes through the discharge port 14, the cooling performance of the portion is large. Since the electronic components 21a having a large calorific value, such as a power IC, are arranged near the discharge port 14, the cooling capability of the electronic components 21a can be increased, and the problem of abnormal temperature rise can be reduced. Can be resolved.

FIGS. 2 to 4 show second to fourth embodiments of the present invention. The difference from the first embodiment is that the power IC
A heat sink 22 as a heat radiating member is attached to an electronic component 21a that generates a large amount of heat. And
In the second embodiment shown in FIG. 2, a part of the heat sink 22 is projected into the discharge port 14 of the pump casing 12,
In the third embodiment of FIG. 3, substantially the entire heat sink 22 is projected into the discharge port 14 of the pump casing 12, and in the fourth embodiment of FIG. 4, the entire heat sink 22 and a part of the electronic component 21a are combined. Discharge port 14 of pump casing 12
It is projected inside.

By providing the heat sink 22 as described above,
The electronic component 2 can be further improved by the liquid flowing through the discharge port 14.
1a can be cooled, and since the amount of protrusion of the heat sink 22 into the discharge port 14 is larger in the third embodiment than in the second embodiment, the cooling capacity is further increased. Since a part of the component 21a also protrudes into the discharge port 14, the cooling capacity is further increased.

FIG. 5 shows a fifth embodiment of the present invention.
The difference from the first embodiment is that the printed wiring board 20 is molded at the lower end, which is the other end of the mold stator A, and the electronic component 21a that generates a large amount of heat is located near the internal space C of the mold stator A. It is in the place that was. Even with such a configuration, since the liquid sucked from the suction port 13 flows through the space C, the electronic component 2
1a can be cooled.

FIGS. 6 and 7 show the sixth and seventh embodiments of the present invention.
First, the sixth embodiment of FIG. 6 is different from the fifth embodiment in that a part of the electronic component 21a having a large heat value is partially removed from the inner bottom surface of the mold stator A. It is in the place protruding into C. In the case of such a configuration, the electronic component 21 directly contacts the liquid in the space C, so that the cooling performance is improved.

The seventh embodiment shown in FIG. 7 is different from the fifth embodiment in that the leads of the electronic component 21a are made higher so that the electronic component 21a is located on the inner peripheral surface side of the mold stator A. There. In the space C, the fluid in the gap between the inner peripheral surface of the mold stator A and the outer peripheral surface of the mold rotor B has a high degree of flow as the mold rotor B rotates. Therefore, the cooling efficiency of the electronic component 21 can be improved.

FIG. 8 shows an eighth embodiment of the present invention.
The difference from the fifth embodiment is that a plurality of fins 23 extending in the radial direction are integrally provided at the lower end of the mold rotor B, which is the other end. According to this configuration, when the mold rotor B rotates, the liquid existing between the inner bottom surface of the mold stator A and the lower end surface of the mold rotor B is stirred by the fins 22, and the amount of liquid flowing therebetween increases. Even if the electronic component 21 is on the inner bottom surface side of the mold stator A, the cooling performance of the electronic component 21 can be improved.

FIG. 9 shows a ninth embodiment of the present invention.
The difference from the fifth embodiment is that a plurality of holes 24 are formed in the central portion of the mold rotor B as fluid passages penetrating vertically. According to this configuration, the center of the upper end of the mold rotor B has a negative pressure due to the pumping action of the vane 18 due to the rotation of the mold rotor B.
The liquid existing between the inner bottom surface of the mold stator A and the lower end surface of the mold rotor B is sucked into the pump casing 12 through the hole 24, and the liquid flowing out of the vane 18 flows around the outer periphery of the mold rotor B. It circulates downward through it and is sucked up again through hole 24, and so on.

Therefore, the amount of liquid flowing between the inner bottom surface of the mold stator A and the lower end surface of the mold rotor B increases, and the cooling performance of the electronic component 21 can be improved.

FIG. 10 shows a tenth embodiment of the present invention. The difference from the fifth embodiment of FIG.
Are disposed so as to be located on both the inner bottom surface side and the inner peripheral surface side of the mold stator A, and the outer dimensions of the mold stator A are reduced by one degree, and the outside thereof is covered with a bottomed cylindrical outer case 25. A circulating passage 26 as a fluid passage is formed therebetween. And
The upper portion of the circulation flow path 26 is directly connected to the discharge port 14, and is connected to the internal space D of the pump casing 12 via a communication hole 27 formed in the mold stator A, and the lower portion is The stator A is communicated with the space C via a plurality of communication holes 28 formed at the center of the bottom of the stator A.

According to this configuration, when the impeller 19 is rotated by the mold rotor B, a part of the liquid discharged from the vane 18 flows into the circulation channel 26 from the discharge port 14 and the communication hole 27, It flows downward through the circulation flow path 26, flows into the space C through the communication hole 28, and then flows upward through the space C and is again sucked into the vane 18. Thereby, the electronic components 21 arranged on the bottom surface side and the inner peripheral surface side of the mold stator A are efficiently cooled.

FIG. 11 shows an eleventh embodiment of the present invention. This embodiment is different from the tenth embodiment in that:
The molded stator A is further reduced in size to a smaller size, the coil 4 is molded and formed into a bottomed cylindrical shape exposing a part of the stator core 3, the outside of which is covered with an outer case 25, and a circulation flow path 26 is formed between the two. The cross-sectional area is enlarged. The mold stator A is further reduced in size to allow the liquid flowing into the circulation flow path 26 to flow downward on the outer peripheral portion of the stator core 3 that has protruded into the circulation flow path 26. A hole 29 is formed as a fluid passage penetrating vertically.

With this configuration, the stator core 3 can be directly cooled by the liquid flowing in the circulation flow path 26, and the amount of liquid flowing in the circulation flow path 26 can be increased.

FIGS. 12 and 13 show a twelfth embodiment of the present invention. This embodiment is different from the first embodiment in that a molded casing A is formed by resin-molding a stator 2. It is configured by a mold body 30 and an auxiliary mold body 31 formed by resin-molding the printed wiring board 20.

The printed wiring board 20 and the stator 3 are electrically connected by a waterproof connector 32 shown in FIG. The waterproof connector 32 includes a male connector 33 and a female connector 34. A seal member 36 is fixed to a lead-out portion of the lead wire 35 in order to prevent water from entering the connectors 33 and 34. A packing 3 is provided at the fitting portion between the male connector 33 and the female connector 34.
7 is mounted.

When the mold casing A is divided into two parts as described above, the stator 2 and the printed wiring board 20 can be separately resin-molded, so that the productivity is improved. In addition, since both are provided with the connectors 33 and 34, electrical connection is easy, and since they have a waterproof structure, insulation deterioration due to water entry can be prevented.

FIG. 14 shows a thirteenth embodiment of the present invention. In this embodiment, the liquid in the space C is exchanged by the permanent magnet type rotor 6. That is, the permanent magnet type rotor 6 has the permanent magnet 8 mounted around the rotor core 7.
Is divided into a plurality in the circumferential direction, and a gap G is provided between the divided permanent magnets 8a. The rotor 6 is molded with the resin 10 so as to leave a gap G between the divided permanent magnets 8a. If the gap G is left as described above, the surface area of the mold rotor B in contact with the liquid increases, and a stirring effect on the liquid is obtained, so that the cooling effect is further enhanced.

FIG. 15 shows a fourteenth embodiment of the present invention. The difference from the thirteenth embodiment is that the gap G formed between the divided permanent magnets 8a is inclined or spiral. It is formed as follows. The inclination direction of the gap G is determined so as to incline upward in the rotation direction of the rotor 6. With this configuration, when the mold rotor B rotates, the gap G acts as a blade groove, so that the liquid in the space C flows upward. Increase the cooling capacity.

FIG. 16 shows a fifteenth embodiment of the present invention. In this embodiment, the cooling performance is improved by increasing the surface area of the mold stator A. That is,
A longitudinal groove 37 is formed at the tip of the teeth 3a of the stator core 3.
Are formed, and a gap g is provided between the coils 4.
Are formed. The stator 2 is made of resin 5
Accordingly, the mold is formed so as to leave the vertical groove 37 and the gap g. If the vertical groove 37 and the gap g are left as described above,
Since the surface area of the mold stator A in contact with the liquid increases, the cooling effect becomes higher.

FIG. 17 shows a sixteenth embodiment of the present invention, which relates to the connection structure between the coil 4 and the printed wiring board 20. That is, the coil 4 is wound around the bobbin 38 mounted on the teeth 3 a of the stator core 3. The terminal of the coil 4 is connected to a pin 39 as a terminal fixed to the bobbin 38, and the pin 3
9 is inserted into a small hole 40 formed in the printed wiring board 20, and solder 4 is attached to the wiring pattern of the printed wiring board 20.
1 connected. With this configuration, since the printed wiring board 20 can be connected to the stator 2 in a stable state, when both are molded with the resin 5, the molding can be easily performed.

FIG. 18 shows a seventeenth embodiment of the present invention, in which the shaft 42 of the rotor 6 is formed integrally with the molding resin 10 of the rotor 6 and the resin shaft 42 is formed by a ceramic bearing 43. It is designed to be rotatably supported. Thus, the resin shaft 4
2. If the ceramic bearing 43 is used, rust hardly occurs, and the types of applicable fluids are widened. The ceramic bearing 4
Since it is not necessary to make the length 3 so long in the axial direction, it is possible to make the ceramic excellent in productivity.

FIGS. 19 and 20 show the eighteenth and nineteenth embodiments of the present invention, respectively. These embodiments show a specific configuration of the ceramic bearing 43, and are similar to the eighteenth embodiment shown in FIG.
In the embodiment, the inner race 43a and the outer race 43
The inner race 43a is formed as a ball bearing by providing a ball 43c between
, And the outer race 43b is fitted to the mold stator A. In the nineteenth embodiment of FIG. 20, the inner race 43a is omitted, and the ball 43c is configured as a direct ball bearing that directly contacts the resin shaft 42.

FIG. 21 shows a twentieth embodiment of the present invention. This is because the helical bone groove 4 is formed on the outer peripheral surface of the mold rotor B.
4 is formed. In this case, the fluid existing around the outer periphery of the mold rotor B acts as a bearing, so that the bearing 43 may be made rough enough to prevent falling when stopping.

FIG. 22 shows a twenty-first embodiment of the present invention. The difference from the twentieth embodiment is that helical bone grooves (not shown) are formed on the outer peripheral surface and the lower surface of the mold rotor B. The fluid existing under the mold rotor B also functions as a bearing. In this embodiment, neither the bearings nor the shafts 9 and 42 of the rotor 6 are provided.

FIG. 23 shows a twenty-second embodiment of the present invention. Although the embodiment described above has been described with reference to the inner rotor type motor, this embodiment shows an example in which an outer rotor type motor is used. Hereinafter, the same portions as those of the first embodiment of FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. Only different portions will be described.

That is, the stator 2 of the motor 1 is molded at a central portion inside the molded stator A.
A molded rotor B formed by molding a rotor core 7 on which a permanent magnet 8 is mounted with a resin 10 is formed in a cylindrical shape with an upper surface closed, and a shaft 9 fixed at the center thereof has
It is rotatably supported by the mold stator A and the casing cover 11. An impeller 19 is formed by projecting a vane 18 on the outer periphery of the mold rotor B. The printed wiring board 20 on which the electronic components 21 of the control circuit E are mounted is molded on the bottom side of the molded stator A.

FIG. 24 shows a twenty-third embodiment of the present invention. This is, for example, a temperature sensor 45 that detects the temperature of the coil 4.
And the output signal of the temperature sensor 45 is input to the control unit e of the control circuit E, and the control unit e controls the drive circuit unit f to supply power corresponding to the temperature detected by the temperature sensor 45 to the motor 1. I do. Further, the controller e outputs a signal for displaying the detection content of the temperature sensor 45 or the control state of the motor 1 to an external device to the external device.

FIG. 25 shows a twenty-fourth embodiment of the present invention. For example, the flow rate sensor 46 is provided at the discharge port 14, and the control circuit E controls the motor 1 to supply electric power according to the flow rate detected by the flow rate sensor 46, and the discharge flow rate becomes a set desired amount. Sorry.

The present invention is not limited to the embodiment described above and shown in the drawings, but can be extended or modified as follows. On the stator 2 side, it is sufficient that at least the coil 4 is molded with the resin 10, and any structure may be used as long as the portion where only the coil 4 is molded faces the fluid passage.

It is sufficient that at least a component having a large calorific value such as a power IC among the components constituting the control opening E is resin-molded. In the case where only a component having a large calorific value is resin-molded in this way, other components may transmit heat from a component with a large calorific value through the molding resin 10 to shorten the life thereof. It can be prevented beforehand.

The rotor may be composed of a pound magnet in which magnetic powder is mixed into resin to make the magnetic powder permanent. This eliminates the need to mold the rotor with a resin, thereby simplifying the structure and reducing the manufacturing cost. In this case, the shaft of the rotor may be made of metal or may be integrally formed of a resin constituting the pound magnet. Also, a fluid bearing may be formed by forming a helical bone groove on an outer surface without providing a shaft.

[0054]

As described above, according to the present invention, the following effects can be obtained. According to the first aspect of the present invention, since the mold stator constitutes at least a part of the fluid passage, the coil and the components of the control circuit resin-molded in the mold stator are cooled by the fluid flowing through the passage. become. According to the second aspect of the present invention, since the rotor is made of a pound magnet in which magnetic powder is mixed into resin and the magnetic powder is made into a permanent magnet, there is no need to mold the permanent magnet.

According to the third aspect of the present invention, only the heat-generating components of the control circuit components can be prevented from adversely affecting the other components. Claim 4
According to the invention described above, the stator and the control circuit can be separately molded because they are constituted by the part where the stator is molded and the part where the components of the control circuit are molded.

According to the fifth aspect of the present invention, since the mold resin is a resin having a high thermal conductivity, the cooling performance is further improved. According to the sixth aspect of the present invention, of the mold stator and the mold rotor, the portion facing the fluid passage has an uneven surface, so that the cooling efficiency is further enhanced. According to the seventh aspect of the present invention, since the components of the control circuit molded in the mold body are arranged near the fluid passage,
According to an eighth aspect of the present invention, the components of the control circuit are disposed so as to face the gap between the mold stator and the mold rotor. Therefore, in the ninth aspect of the present invention, the components of the control circuit molded in the mold body are provided. Since the heat radiating member is attached to the control circuit, the components of the control circuit can be efficiently cooled.

According to the tenth aspect of the present invention, the heat radiating member is provided at a portion facing the passage through which the fluid passes.
In the described invention, since the heat radiation member is exposed in the passage through which the fluid passes, the components of the control circuit can be cooled more efficiently. According to the twelfth aspect of the present invention, the fluid passage extending in the axial direction is formed in the mold rotor.
In the described invention, the mold stator is covered by the outer case, and the fluid passage is formed between the mold stator and the outer case, so that the flow rate of the fluid passing through the space between the mold stator and the mold rotor can be increased. .

According to the fourteenth aspect of the present invention, since the molding is performed without closing the gap between the plurality of permanent magnets, the surface area of the molded rotor is increased, and the cooling efficiency is improved. According to the fifteenth aspect, the gap between the divided permanent magnets is inclined in the axial direction, so that the fluid can be forced to flow through the gap. In the invention according to claim 16, the stator coil is mounted on the stator core with a gap therebetween, and the resin molded with the stator is molded without closing the gap between the coils. And the cooling efficiency is improved.

According to the seventeenth aspect of the present invention, since the permanent magnet is made of a rare earth element, it can be magnetized more strongly and can be configured as a motor with a large output. According to the eighteenth aspect of the present invention, since the rotor is provided with the fin located on the side opposite to the side where the impeller is provided, the fluid in the mold stator can be agitated by the fin and the cooling efficiency can be improved. it can. According to the nineteenth aspect of the present invention, since the rotor shaft is formed integrally with the mold resin and the resin shaft is rotatably supported by the ceramic bearing, there is no rust problem, and the range of usable fluid is expanded. According to the twentieth aspect of the present invention, since the ceramic bearing is a ball bearing, the configuration is simple. In the twenty-first aspect of the present invention, the ball of the ball bearing is a direct ball bearing in direct contact with the resin shaft. This further simplifies the bearing configuration.

According to the twenty-second aspect of the present invention, since the rotor is configured to be rotatably supported by the fluid, a bearing as a component is not required. In the invention according to claim 23,
Since the coil is wound around the bobbin, the bobbin is provided with a terminal for connecting the terminal of the coil, and the terminal is used to connect the coil to the wiring board, the stator and the wiring board can be easily molded integrally. In the invention according to claim 24, since energization of the coil is controlled in accordance with the temperature detected by the temperature sensor, the risk of abnormal temperature rise can be eliminated. Claim 25
In the described invention, since the energization of the coil is controlled in accordance with the flow rate detected by the flow rate sensor, the flow rate can be arbitrarily controlled.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a partial sectional view showing a second embodiment of the present invention.

FIG. 3 is a view corresponding to FIG. 2, showing a third embodiment of the present invention;

FIG. 4 is a view corresponding to FIG. 2, showing a fourth embodiment of the present invention;

FIG. 5 is a view corresponding to FIG. 1, showing a fifth embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 1, showing a sixth embodiment of the present invention;

FIG. 7 is a view corresponding to FIG. 1, showing a seventh embodiment of the present invention.

FIG. 8 is a view corresponding to FIG. 1, showing an eighth embodiment of the present invention;

FIG. 9 is a view corresponding to FIG. 1, showing a ninth embodiment of the present invention;

FIG. 10 is a view corresponding to FIG. 1, showing a tenth embodiment of the present invention;

FIG. 11 is a view corresponding to FIG. 1, showing an eleventh embodiment of the present invention.

FIG. 12 is a view corresponding to FIG. 1, showing a twelfth embodiment of the present invention;

FIG. 13 is a sectional view of a waterproof connector.

FIG. 14 is a cross-sectional view of a rotor according to a thirteenth embodiment of the present invention.

FIG. 15 is a perspective view of a rotor showing a fourteenth embodiment of the present invention.

FIG. 16 is a transverse sectional view of a stator showing a fifteenth embodiment of the present invention.

FIG. 17 is a perspective view of a coil portion showing a sixteenth embodiment of the present invention.

FIG. 18 is a sectional view of a bearing portion of a rotor showing a seventeenth embodiment of the present invention.

FIG. 19 is a sectional view of a ceramic bearing according to an eighteenth embodiment of the present invention.

FIG. 20 is a view corresponding to FIG. 19 showing a nineteenth embodiment of the present invention;

FIG. 21 is a view corresponding to FIG. 18 showing a twentieth embodiment of the present invention.

FIG. 22 is a sectional view of a bearing portion showing a twenty-first embodiment of the present invention.

FIG. 23 is a view corresponding to FIG. 1, showing a twenty-second embodiment of the present invention.

FIG. 24 is a block diagram showing a twenty-third embodiment of the present invention.

FIG. 25 is a schematic view showing a twenty-fourth embodiment of the present invention.

[Explanation of symbols]

In the figure, 1 is a motor, 2 is a stator, 3 is a stator core,
4 is a coil, 5 is a resin, 6 is a rotor, 7 is a rotor core,
8 is a permanent magnet, 9 is a shaft, 10 is a resin, 11 is a casing cover, 12 is a pump casing, 13 is a suction port, 14 is a discharge port, 18 is a vane, 19 is an impeller, 2
0 is a printed circuit board, 22 is a heat sink (heat radiating member), 23 is a fin, 24 is a hole (fluid passage), 25 is an outer case, 26 is a circulation flow path (fluid passage), 32 is a waterproof connector, 38 is a bobbin, 39 is a pin (terminal), 42 is a resin shaft, 43 is a ceramic bearing, 45 is a temperature sensor, and 46 is a flow rate sensor.

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02K 21/14 H02K 21/14 M // H02K 7/14 7/14 B

Claims (25)

[Claims] A motor having a stator having a plurality of coils and a rotor of a permanent magnet type; an impeller provided on the rotor of the motor; and a control circuit for controlling energization of the coils of the motor. A permanent magnet rotor of the motor is resin-molded to form a molded rotor, and at least a part of the control circuit and at least the coil of the stator are resin-molded to form a molded stator. A pump comprising at least a part of a passage of a fluid sucked and discharged by the impeller. 2. A motor having a stator having a plurality of coils, a rotor made of a pound magnet in which magnetic powder is mixed into resin to make the magnetic powder permanent, and an impeller provided on the rotor of the motor. And a control circuit for controlling energization of the coil of the motor, wherein at least a part of the control circuit and at least the coil of the stator are resin-molded to form a molded stator. A pump comprising at least a part of a passage of a fluid sucked and discharged by an impeller. 3. The pump according to claim 1, wherein, of the components of the control circuit, a component to be resin-molded on the mold stator is a heat-generating component such as a power element. 4. The molded stator has a resin-molded portion of the stator and a resin-molded portion of a control circuit component, and the two are electrically connected by a waterproof connector. The pump according to any one of claims 1 to 3, wherein: 5. The pump according to claim 1, wherein the resin in which the components of the stator, the rotor and the control circuit are molded is a resin having a high thermal conductivity. 6. The pump according to claim 1, wherein a surface of a portion of the mold rotor and the mold stator facing the fluid passage is formed in an uneven shape. 7. The resin-molded control circuit component includes:
The pump according to any one of claims 1 to 6, wherein the pump is arranged near a fluid passage. 8. An arrangement space of the mold rotor is communicated with a fluid passage, and a component of a control circuit resin-molded on the mold stator is arranged so as to face a gap between the mold stator and the mold rotor. The pump according to any one of claims 1, 3 to 6, wherein: 9. The pump according to claim 1, wherein a heat radiation member is attached to a part of the control circuit resin-molded on the molded stator. 10. The pump according to claim 9, wherein the heat radiation member is provided at a portion facing a passage through which the fluid passes. 11. The pump according to claim 9, wherein the heat radiating member is exposed in a passage through which the fluid passes. 12. The mold rotor according to claim 1, wherein a fluid passage extending in the axial direction is formed in the mold rotor.
12. The pump according to any of 3 to 11. 13. The pump according to claim 1, wherein the molded stator is covered with an outer case, and a fluid passage is formed between the molded stator and the outer case. 14. The permanent magnet of the rotor is divided into a plurality,
The divided permanent magnets are arranged with a gap therebetween, and the resin that molds the rotor is molded without closing the gap between the divided permanent magnets. 13. The pump according to any one of claims 12 to 12. 15. The pump according to claim 14, wherein the gap between the divided permanent magnets is formed to be inclined or spiral in the axial direction. 16. The coil of the stator is mounted on the stator core with a gap between them, and the resin that molds the stator is molded without closing the gap between the coils. 16. The pump according to any one of 1 to 15. 17. The pump according to claim 1, wherein the permanent magnet is a rare earth element. 18. The pump according to claim 1, wherein a fin is provided on the mold rotor on a side opposite to a side on which the impeller is provided. 19. The pump according to claim 1, wherein a shaft of the rotor is formed integrally with a mold resin, and the resin shaft is rotatably supported by a ceramic bearing. . 20. The pump according to claim 19, wherein the ceramic bearing comprises a ball bearing. 21. The pump according to claim 20, wherein the ball bearing is a direct ball bearing in which a ball directly contacts a resin shaft. 22. The pump according to claim 1, wherein the rotor is configured to be rotatably supported by the fluid. 23. The coil according to claim 1, wherein the coil is wound around a bobbin, the bobbin is provided with a terminal for connecting a terminal of the coil, and the terminal is connected to the wiring board by the terminal. A pump as described in Crab. 24. The pump according to claim 1, further comprising a temperature sensor, wherein energization of the coil is controlled according to a temperature detected by the temperature sensor. 25. The pump according to claim 1, further comprising a flow rate sensor for detecting a flow rate of the fluid, and controlling the energization of the coil in accordance with the flow rate detected by the flow rate sensor.