JPH11252837A - Pump motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the degradation of motor characteristics by making the flow of fluid smooth without the use of a cylinder. SOLUTION: A pump motor 40 which drives a pump device 20 for feeding fluid has a casing 41 in which a flow path 44 through which the fluid flows is formed, a stator 50 which is provided in the casing 41 to surround the flow path 44 and a rotor 60 provided in the flow path 44. The rotor 60 is provided with a shaft 61 which drives the pump device 20, a yoke 62 provided on the shaft 61, magnets 63 attached to the outer circumference of the yoke 62, and a resin material 64 which fills gaps between the magnets 63 to form the rotor 60 into a rotary unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump motor for driving a fluid pump for delivering a liquid such as gasoline, and more particularly to a pump motor capable of improving the motor efficiency.

[0002]

2. Description of the Related Art FIG. 3A is a longitudinal sectional view showing a conventional pump motor 10 and a conventional pump device 20 used for sending a liquid L such as gasoline. Pump motor 10
Includes a cylindrical casing 11 formed of a molding material, and an opening 11a on the right side in FIG.
2 is liquid-tightly covered. The lid 12 is connected to a tank (not shown).

In FIG. 3A, reference numeral 13 denotes a stator, 1
Reference numeral 4 denotes a rotor. The rotor 14 is a pump device 2
0, a yoke 16 attached to the shaft 15, and a plurality of sintered magnets 17 attached around the yoke 16. In FIG. 3A, reference numerals 18a and 18b denote bearings that support the shaft 15, and reference numeral 19 denotes a flow path through which the liquid L flows. G in FIG. 3A indicates a gap between the stator 13 and the rotor 14. FIG. 3B is a cross-sectional view of the rotor 14, and FIG. 3C is a perspective view.

[0004]

The above-described conventional pump motor 10 has the following problems. That is, the sintered material magnet 17 is press-formed,
As shown in FIG. 3 (b), the chamfered portion 17a is inevitably formed as shown in FIG.
Is formed. In addition, there is a problem that manufacturing cost increases if grinding is performed so that the chamfered portion 17a is not formed.

For this reason, when the magnets 17 are attached to the yoke 16, grooves 17b are formed between the magnets 17. The opening of the groove 17b becomes wider due to the chamfer 17a. In this case, when the fluid L flows through the flow path 19 between the stator 13 and the rotor 14, the fluid L
Enter the fluid L and agitate the fluid L, causing loss due to agitation resistance and deteriorating motor characteristics.

On the other hand, as shown in FIG. 4A, a cylinder 30 made of a non-magnetic material (stainless steel) is provided around the magnet 17 in order to prevent stirring resistance due to the groove 17b between the magnets 17 from occurring. A method of putting on is also conceivable.
However, there is a problem that the thickness of the cylinder 30 widens the gap G and deteriorates the motor characteristics. Also,
The stainless steel material is also expensive, and a fixing member for the cylinder 30 and the like are required, so that there is a problem that the manufacturing cost is increased.

Accordingly, an object of the present invention is to provide a pump motor capable of preventing a decrease in motor characteristics by smoothing the flow of fluid without using a cylinder.

[0008]

Means for Solving the Problems In order to solve the above problems and achieve the object, an invention according to claim 1 is a pump motor for driving a fluid pump for sending out a fluid, wherein the fluid flows through the motor. A housing in which a flowing channel is formed,
A stator provided in the housing, comprising a stator disposed at a position surrounding the flow path, and a rotor disposed in the flow path, wherein the rotor drives the fluid pump, A yoke provided on the shaft, a plurality of magnets attached to the outer periphery of the yoke, and a resin material filled at least between the plurality of magnets and formed so that the rotor becomes a rotating body. I made it.

According to a second aspect of the present invention, in the first aspect of the present invention, the resin material is further provided on both ends in the axial direction of the magnet. Claim 3
In the invention described in (1), in the invention described in claim (2), the outer peripheral portions of both ends in the axial direction of the magnet are chamfered.

[0010] As a result of taking the above measures, the following effects are produced. That is, in the invention described in claim 1, the rotor disposed in the flow path is formed of a resin material formed such that the rotor becomes a rotor between a plurality of magnets attached to the outer periphery of the yoke. Because it is filled, when the fluid flows between the rotor and the stator, it becomes difficult for the fluid to be agitated,
Loss can be prevented. For this reason, motor characteristics can be maintained without widening the gap between the rotor and the stator.

According to the second aspect of the present invention, since the resin material is further provided on both ends in the axial direction of the magnet, the magnet can be firmly attached to the yoke.
The movement of the magnet in the axial direction can be prevented.

According to the invention described in claim 3, the magnet is:
Since the outer periphery of both ends in the axial direction is chamfered, the resin material covers the outer periphery of the magnet at both ends, and the magnet can be firmly attached to the yoke, preventing the magnet from scattering etc. can do.

[0013]

1A to 1C are views showing a pump motor 40 and a pump device (fluid pump) 20 according to an embodiment of the present invention, wherein FIG. FIG. 4B is a longitudinal sectional view, FIG. 4B is a transverse sectional view of a rotor 60 incorporated in the pump motor 40, and FIG. 4C is a front view of a magnet 63 attached to the rotor 60. FIG. 2A is a perspective view showing a state before the resin material 64 of the rotor 60 is filled, and FIG. 2B is a perspective view showing the rotor 60.

The pump motor 40 has a cylindrical casing (housing) 41 formed of a molding material. The opening 41a on the right side in FIG. ing. The lid 42 is connected to a tank (not shown). In FIG. 1A, reference numerals 43a and 43b denote bearings that support a shaft 61 described later, and reference numeral 44 denotes a flow path through which the liquid L flows.

In FIG. 1A, reference numeral 50 denotes a stator (stator), and 60 denotes a rotor (rotor). The rotor 60 includes a shaft 61 for driving the pump device 20, a yoke 62 attached to the shaft 61, a plurality of magnets 63 made of a sintered material attached around the yoke 62, and a resin material 64. Have. A groove 65 is formed between the magnets 63. The magnet 63 has a chamfered portion 63a formed in a manufacturing process.
And a chamfered portion 63b formed on the outer peripheral surface at both ends in the axial direction.

As shown in FIGS. 1A and 1B, the resin material 64 is filled in the groove 65 between the magnets 63 and in the axial end portion. Also, the chamfered portion 6 of the magnet 63
3b is also filled on the outer peripheral side. Then, the resin material 64
The rotor 60 has a columnar (rotating) shape by the magnet 63.

In FIG. 1A, G indicates a gap between the stator 50 and the rotor 60. The pump motor 40 configured as described above has the following effects. That is, the stirring of the liquid L by the groove 50 and the chamfered portion 63a can be prevented without attaching a cover such as a cylinder to the outer periphery of the magnet 63 of the rotor 60. Therefore, the gap G between the stator 50 and the rotor 60
Can be made only the mechanically necessary air gap, and the motor characteristics can be improved. Since the chamfered portion 63a is formed and the liquid L is not agitated, the magnet 63 does not need to have a special shape, and can be manufactured at low cost by a normal manufacturing process.

A chamfered portion 63b is provided at both ends in the axial direction of the magnet 63, and a resin material 6 is provided outside the chamfered portion 63b.
Since the resin 4 is integrally molded with resin 4, the magnet 63 can be fixed more firmly than when the rotor 63 is bonded with an adhesive, and the scattering of the magnet 63 can be prevented. That is, reliability and quality can be improved.

Further, since the agitation measures and the fixing of the magnet 63 can be performed simultaneously by insert molding, the manufacturing process can be simplified and the manufacturing can be performed at low cost.

On the other hand, the resin material is lighter than the case where the magnet 63 is covered with a stainless steel tube or the like.
The moment of inertia of 0 is reduced, and the response is improved.
Note that the present invention is not limited to the embodiment,
Of course, various modifications can be made without departing from the spirit of the present invention.

[0021]

According to the first aspect of the present invention, the rotor disposed in the flow path is formed so that the rotor becomes a rotor between a plurality of magnets mounted on the outer periphery of the yoke. Since the resin material is filled, when the fluid flows between the rotor and the stator, it is difficult for the fluid to be stirred,
Loss can be prevented. For this reason, motor characteristics can be maintained without widening the gap between the rotor and the stator.

According to the second aspect of the present invention, the resin material is further provided on both ends of the magnet in the axial direction, so that the magnet can be firmly attached to the yoke, Can be prevented.

According to the third aspect of the present invention, since the outer periphery of the magnet at both ends in the axial direction is chamfered, the resin material covers the outer periphery of the magnet at both ends. In addition, the magnet can be firmly attached to the yoke, and scattering of the magnet can be prevented.

[Brief description of the drawings]

FIG. 1 is a view showing a pump motor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a rotor incorporated in the pump motor.

FIG. 3 is a diagram showing an example of a conventional pump motor.

FIG. 4 is a view showing another example of a conventional pump motor.

[Explanation of symbols]

 Reference Signs List 20 pump device (fluid pump) 40 pump motor 41 housing 44 flow path 50 stator (stator) 60 rotor (rotor) 61 shaft 62 yoke 63 magnets 63a, 63b … Chamfered part 64… Resin material

Claims (3)

[Claims] 1. A pump motor for driving a fluid pump for sending out a fluid, comprising: a housing in which a flow passage through which the fluid flows is formed; and a housing provided in the housing and at a position surrounding the flow passage. A rotor disposed in the flow path, the rotor comprising: a shaft for driving the fluid pump; a yoke provided on the shaft; and a yoke provided on the outer periphery of the yoke. A pump motor, comprising: a plurality of magnets provided; and a resin material filled at least between the plurality of magnets and formed so that the rotor becomes a rotating body. 2. The pump motor according to claim 1, wherein the resin material is further provided on both ends of the magnet in the axial direction. 3. The pump motor according to claim 2, wherein the magnets have chamfered outer peripheral portions at both ends in the axial direction.