DE102006035354A1 - Brushless motor and fluid pump with a brushless motor - Google Patents

Abstract

A fuel pump (10) has a stator core (30) which has circumferentially arranged teeth (33). Coils (42) are formed by concentrically winding a wire around each of the teeth (33). The coils (42) circumferentially generate magnetic poles in inner circumferential peripheries of the teeth (33) when supplied with energy. The magnetic poles are switched by controlling the power supplied to the plurality of teeth (42). A rotor (60) has an outer circumferential circumference facing the inner circumferential peripheries. The outer circumferential periphery defines magnetic poles that differ with respect to a rotational direction thereof. A pump section (12) has a rotating member (24) which is rotated by the rotor (60) for pumping fuel. An electrically insulating resin material (46) is interposed between the teeth (33) which are circumferentially adjacent to each other, thereby molding the same so that the electrically insulating resin material (46) covers the plurality of coils (42).

Description

Technical area

The The present invention relates to a brushless motor and a fuel pump with the brushless Engine.

For example according to JP-A-5-340345 a fuel pump is a brushless one Motor as drive source on. Generally causes a motor (brush motor) with a brush Losses such as a sliding resistance between a commutator and a brush, an electrical resistance between the commutator and the brush and a fluid resistance caused in grooves through which the Commutator is divided into segments. In contrast, a brushless motor in the brush motor do not cause occurring losses described above. Therefore, the efficiency of a brushless motor is higher than that of a brush motor, so that the pump efficiency of a fuel pump with a brushless Engine is improved. The pump efficiency is a ratio of by the fuel pump generated amount of work in relation to the Fuel pump supplied Energy. The amount of work done by the fuel pump can be calculated by multiplying fuel discharge pressure by a fuel discharge amount become.

If the amount of work is constant when the efficiency of the fuel pump can increase the engine section be downsized so that the fuel pump can be downsized. A fuel pump with a brushless Engine can be applied to a small vehicle such as a motorcycle become.

A Fuel pump can be downsized by reducing the space which is occupied by coils. In addition, a coil must be in one Fuel pump opposite Protected against corrosion which is due to being exposed to fuel is when a bad fuel or fuel with worse quality is used.

The JP-A-5-340345 does not disclose a reduction in the number of coils Space in the brushless Engine applied to the fuel pump. In addition is in JP-A-5-340345 a housing provided for housing the stator, the coils and the Stator core has to protect the stator against corrosion. The Components through which the housing is welded, are welded for tight sealing. Accordingly is in this structure a manufacturing work for welding the housing required.

Presentation of the invention

in the In view of the above and other problems, the present Invention an object of the invention to provide a brushless motor, having the coils which are protected by a simple structure can. Another object of the present invention is a fuel pump with this brushless To provide motor.

Technical solution

These Task is achieved by a fluid pump according to claim 1 and a Fluid pump according to claim 7 solved.

According to one Embodiment of the present invention includes a fluid pump Stator core having a plurality of circumferentially arranged teeth. The fluid pump further includes a plurality of coils, the each by concentric winding a wire around outer circumferential circumferences the teeth are formed. The plurality of coils generates rotating magnetic poles in inner circumferential circumferences the multitude of teeth, when fed to this energy becomes. The magnetic poles are controlled by controlling the plurality of coils supplied Energy switched. The fluid pump furthermore has a rotor, which is rotatable about the inner circumferential peripheries of the plurality of teeth is, wherein the rotor has an outer circumferential Has circumference, which is opposite to the inner circumferential peripheries of the plurality of teeth. The outer circumferential circumferences defined magnetic poles, which are in relation to a direction of rotation of the rotor differ from each other. The fluid pump continues to point a pump section having a rotating part, wherein the rotor rotates the rotating part to pump fluid. The fluid pump further comprises an electrically insulating resin material on, which is introduced between the plurality of teeth, the circumferentially adjacent to each other. The electrically insulating resin material becomes so poured, that the electrically insulating resin material, the plurality covers the coils.

According to a second aspect of the present invention, a brushless motor is at least partially immersed in fluid. The brushless motor has a stator core having a plurality of circumferentially arranged teeth. The brushless motor further comprises a plurality of coils, each by concentrically winding a wire around outer circumferential peripheries of Teeth are formed. The plurality of coils generate circulating magnetic poles in inner circumferential peripheries of the plurality of teeth when power is supplied thereto, and the magnetic poles are switched by controlling the power supplied to the plurality of coils. The brushless motor further includes a rotor that is rotatable about the inner circumferential peripheries of the plurality of teeth, the rotor having an outer peripheral circumference facing the inner circumferential peripheries of the plurality of teeth. The outer circumferential peripheries defined magnetic poles, which differ from each other with respect to a rotational direction of the rotor. The brushless motor further includes an electrically insulating resin material interposed between the plurality of teeth circumferentially adjacent to each other. The electrically insulating resin material is molded such that the electrically insulating resin material isolates the plurality of coils from the fluid.

advantageous Embodiments are the subject of the dependent claims.

Short description of Illustrations of the drawings

The described above and other objects, features and advantages according to the present Invention will become apparent from the following detailed description Referring to the accompanying drawings clearly. Show it:

1 FIG. 3 is a partial longitudinal sectional view illustrating a fuel pump according to a first embodiment; FIG.

2 a sectional view taken along the line II-II in 1 taken,

3 a perspective view of a tilt restriction part of the fuel pump,

4 a sectional view of a fuel pump according to a second embodiment, and

5 a sectional view of a fuel pump according to a third embodiment.

Way (s) to execute the invention

First embodiment

As it is in 1 is shown is a fuel pump 10 according to this embodiment which is arranged in a tank turbine pump in a fuel tank of a motorcycle with an engine size of for example 150 cm ³ (150 cc) is provided.

The fuel pump 10 has a pump section 12 and a motor section 13 on. The engine section 13 turns the pump section 12 , In the case 14 is both the pump section 12 as well as the engine section 13 accommodated. A pump housing 20 and an end cover 48 are by crimping both axial ends of the housing 14 attached. The thickness of a section of a housing 14 , which is the outer circumferential circumference of the stator core 30 in the engine section 13 covering is less than the thickness of a section that is one step 15 in the pump section 12 Are defined. The housing 14 is not required to define a magnetic circuit. Therefore, the outer diameter of the engine section 13 be reduced by the thickness of the housing 14 is reduced, which is the outer circumferential circumference of the stator core 30 surrounds.

The pump section 12 is a turbine pump, the pump housing 20 . 22 and an impeller 24 having. The pump housing 22 bumps axially on the step 15 of the housing 14 , This is the pump housing 22 axially aligned. The pump housing 20 is by crimping one end of the housing 14 attached. By crimping an axial force is caused, whereby a pressure for axial pressing of the pump housing 22 and the pump housing 20 each on the step 15 and the pump housing 22 is generated so that the fuel is sealed.

In the pump housings 20 and 22 is rotatable the impeller 24 housed as a rotating part. The pump housing 20 and 22 and the impeller 24 define pump ports in C-shapes in between. Fuel is through an inlet port 200 , for the pump housing 20 is provided, pulled and passed through the pump passages 202 by the rotation of the impeller 24 pressurized, causing him under pressure to the engine section 13 is encouraged. The under pressure to the engine section 13 Promoted fuel becomes an internal combustion engine via an outlet port 206 after passing through a fuel passage 204 has passed between the stator core 30 and a rotor 60 is defined.

As it is in 1 and 2 is shown is the motor section 13 a brushless motor (commutator motor), the stator core 30 , Bobbin 40 , Do the washing up 42 and the rotor 60 having. The stator core 30 is from six nuclei 32 constructed, which are arranged circumferentially. An unillustrated control device controls the coils 42 supplied power ent speaking a rotational position of the rotor 60 , creating magnetic poles in the inner circumferential perimeters of the cores 32 are defined to be switched. The inner circumferential volumes of kernels 32 lie the rotor 60 across from.

As it is in 2 shown points each of the cores 32 a tooth 33 and an outer circumferential circumference 34 on. Every core 32 is integrally formed by crimping magnetic steel sheets in relation to the axial direction of the core 32 are stacked. The tooth 33 jumps from the middle of the outer circumferential circumference 34 inside to the rotor 60 in front. The bobbins 40 , which are formed of electrically insulating resin, respectively, the cores 32 engaged. Six of the outer circumferential circumferences 34 define a toroid. Each of the outer circumferential circumferences 34 has substantially an arcuate shape, which has a circumferentially regular width.

The spools 42 are each by concentric winding of a wire around the outer circumference of the bobbin 40 the cores 32 built into a state in which each of the six nuclei 32 a single component is before it revolves around the stator core 30 to be ordered. The spools 42 are each with connections 44 on the side of the end cover 48 connected in a state like he is in 1 is shown.

An electrically insulating resin material 46 is between the teeth 33 are introduced, which are circumferentially adjacent to each other, wherein it is poured so that the electrically insulating resin material 46 the spools 42 covers. The electrically insulating resin material 46 is integral with the end cover 48 poured the end of the stator core 30 on the opposite side of the pump section 12 in terms of the stator core 30 covers. The electrically insulating resin material 46 is integral with the end cover 48 shaped so that components that carry the fuel pump 10 is built, can be reduced, and that the manufacturing work to assemble the fuel pump 10 can be reduced.

As it is in 3 is shown has the inclination restricting part 50 in the middle of a passage opening. The tilt restriction part 50 has claws 52 and passport openings 54 on. The claws 42 hook on the bobbin 40 at. The connections 45 each fit into the fitting openings 54 , 3 shows a substantially annular inclination restricting part 50 before casting the electrically insulating resin material 46 , The connections 44 fit each in the passport openings 54 of the tilt restriction part 50 , so that can prevent the connections 44 be inclined and cause a disturbance of given components when the electrically insulating resin material 46 is cast from resin.

As it is in 1 and 2 is shown, the rotor points 60 a wave 62 and a permanent magnet 65 on. The rotor 60 is rotatable about the inner circumferential periphery of the stator core 30 , the permanent magnet 64 is directly to the outer circumferential circumference of the shaft 62 fit. The outer circumferential circumference of the shaft 62 can be knurled. The wave 62 is rotatable by bearings 26 supported at both ends. The permanent magnet 64 may be a resin magnet produced by mixing magnetic powder with thermoplastic resin such as poly (ethylene sulfide) (PPS). The permanent magnet 64 is essentially cylindrically shaped. The permanent magnet 64 has eight magnetic poles 65 on that with respect to the direction of rotation of the rotor 60 are arranged. The eight magnetic poles 65 become the outer circumferential periphery of the permanent magnet 64 magnetized. The outer circumferential circumference of the permanent magnet 64 is the stator core 30 across from. The magnetic poles are different from each other with respect to the rotational direction of the rotor 60 ,

The end cover 48 has the outlet port 206 on, in which a valve part 70 , an attack 72 and a spring 74 are housed, which form a check valve. Thus, the end cover serves 48 Also as a housing for a check valve so that the components can be reduced by the fuel pump 10 is constructed, and also the manufacturing work for assembling the fuel pump 10 can be reduced.

The valve part 70 is against the biasing force of the spring 74 raised when the pressure of the pressurized fuel in the pump section 12 greater than or equal to a predetermined pressure, so that fuel to the internal combustion engine through the outlet port 206 is ejected. The valve part 70 prevents backflow of the fuel coming out of the fuel pump 10 is ejected.

According to the first embodiment, the coils 42 each made up of the concentric winding around the tooth 33 every kernel 32 is formed, so that the occupancy rate of the winding is improved in comparison with a structure with, for example, a distributed winding. This occupation rate of the winding is a rate of a winding area of the winding with respect to a winding space in which the winding is accommodated. Therefore, a winding space passing through the coils 42 is occupied by increasing the occupancy rate, if the number of windings or turns is constant. Consequently, the engine can cut 13 be reduced, leaving the fuel pump 10 can be reduced.

Furthermore, the electrically insulating resin material 46 between the teeth 33 attached, which are circumferentially adjacent to each other, whereby it is poured so that the electrically insulating resin material 46 the spools 42 covers. Therefore, the coils become 42 Protected against corrosion due to exposure to fuel, and can prevent the coils 42 to foreign material by applying a simple structure. Furthermore, the electrically insulating resin material 46 capable of the coils 42 , which are constructed of the concentric winding to protect against deformation in the winding.

Furthermore, the teeth are 33 of the stator core 30 separated from each other. Therefore, the wire around each of the teeth 33 be wrapped in a state in which the teeth 33 are each a single component before they are circumferentially arranged on the stator core. Thus, the manufacturing work for concentrically winding the wire around each of the teeth 33 be relieved.

Second and Third embodiment

As it is in 4 is shown, according to the second embodiment, a fuel pump 80 a stator core 82 on, which consists of a toroidal core (Toroidkern) 84 and six teeth 85 is constructed. The six teeth are circumferentially around the inner circumferential circumference of the toroidal core 84 arranged. The toroid 84 and the teeth 85 are separate components. The teeth 85 are also separate components. The electrically insulating resin material 46 is between the circumferentially adjacent teeth 85 is introduced, whereby it is poured so that the electrically insulating resin material 46 the spools 42 covers.

As it is in 5 is shown, according to the third embodiment, a fuel pump 90 a stator core 92 on, made of a toroidal core 94 and six teeth 95 is constructed. The six teeth 95 are arranged circumferentially. The six teeth 95 are engaged with the inner circumferential periphery of the toroidal core 94 , The toroid 94 and the teeth 95 are separate components. The teeth 95 are also separate components. The electrically insulating resin material 46 gets between the teeth 95 are introduced, which are circumferentially adjacent to each other, whereby it is poured so that the electrically insulating resin material 46 the spools 42 covers.

According to the second and third embodiments, the concentric winding can be easily formed by concentrically winding the wire around the tooth 85 respectively. 95 be shaped to the coils 42 each build in a state in which the teeth 85 respectively. 95 each are a single component before going into the stator core 82 respectively. 92 to be built in.

Furthermore, according to the third embodiment, the coils 42 each around the teeth 95 Wrapped, and stand the teeth 95 in engagement with the toroidal core 94 , Therefore, the teeth can 95 be arranged slightly with respect to the circumferential direction.

According to the embodiments described above, the brushless motor may be at least partially immersed in fluid such as fuel. The electrically insulating resin material 46 is poured so that the electrically insulating resin material 46 at least partially the multiplicity of coils 42 covering, so that the electrically insulating resin material 46 essentially the coils 42 isolated from the fluid. Thus, the coils can 42 be protected from being exposed to the fluid.

Another embodiment

According to the above described embodiments are the teeth, which are arranged circumferentially to the structure of the stator core, separate Components. Alternatively, you can the teeth so in one piece be shaped, that the teeth circulating are arranged.

According to the embodiments described above, the pump section 12 from the turbine pump with the impeller 24 built up. Alternatively, the pump section may be constructed of a pump having a different structure, such as a gear pump.

The Structures described above according to the embodiments may be as be suitably combined.

According to the above described embodiments become the structures of the brushless Engine applied to a fuel pump. However, they are the above structures described not to apply to fuel pumps limited. The structures described above can Any other fluid pumps are used.

Various Modifications and changes can arbitrary to the embodiments described above without deviation be made of the scope of the invention as defined in the appended claims is.

As described above, a fuel pump 10 has a stator core 30 on, the circumferentially arranged teeth 33 having. Do the washing up 42 are by concentrically winding a wire around each of the teeth 33 shaped. The spools 42 generate circumferential magnetic poles in inner circumferential circumferences of the teeth 33 when this energy is supplied. The magnetic poles are controlled by controlling the variety of teeth 42 supplied energy switched. A rotor 60 has an outer circumferential circumference facing the inner circumferential peripheries. The outer circumferential periphery defines magnetic poles that differ with respect to a rotational direction thereof. A pump section 12 has a rotating part 24 on that by the rotor 60 is rotated to pump fuel. An electrically insulating resin material 46 is between the teeth 33 introduced, which are circumferentially adjacent to each other, whereby this is poured so that the electrically insulating resin material 46 the variety of coils 42 covers.

Claims (7)

Fluid pump ( 10 . 80 . 90 ) with a stator core ( 30 . 82 . 92 ), which has a large number of teeth ( 33 . 85 . 95 ), which are arranged circumferentially, a plurality of coils ( 42 each by concentric winding of a wire around an outer peripheral circumference of the teeth ( 33 . 85 . 95 ) are formed, wherein the plurality of coils ( 42 ) circumferential magnetic poles in inner circumferential peripheries of the plurality of teeth ( 33 . 85 . 95 ), when the power is supplied thereto, the magnetic poles being controlled by controlling the plurality of coils (FIG. 42 ) supplied energy, a rotor ( 60 ) around the inner circumferential peripheries of the plurality of teeth ( 33 . 85 . 95 ) is rotatable, wherein the rotor ( 60 ) has an outer peripheral circumference corresponding to the inner circumferential peripheries of the plurality of teeth ( 33 . 85 . 95 ), wherein the outer circumferential periphery defines magnetic poles which are movable with respect to a direction of rotation of the rotor (FIG. 60 ) are different from each other, a pump section ( 12 ), which is a rotating part ( 24 ), wherein the rotor ( 60 ) the rotating part ( 24 ) for pumping fluid in rotation, and an electrically insulating resin material ( 46 ), that between the multiplicity of teeth ( 33 . 85 . 95 ), which are circumferentially adjacent to each other, wherein the electrically insulating resin material ( 46 ) is poured such that the electrically insulating resin material ( 46 ) the plurality of coils ( 42 ) electrically isolated. A fluid pump according to claim 1, wherein the teeth ( 33 . 85 . 95 ) are separated from each other. A fluid pump according to claim 1 or 2, wherein said electrically insulating resin material ( 46 ) in one piece with a cover ( 48 ), which is one end of the stator core ( 30 . 82 . 92 ) on a relative to the stator core ( 30 . 82 . 92 ) opposite side of the pump section ( 42 ) covers. Fluid pump according to claim 3, further comprising a valve part ( 70 ), which prevents a backflow of the fuel, which by using the pump section ( 12 ) and a stop ( 72 ), which is a lifting position of the valve member ( 70 ), wherein in the cover ( 48 ) the valve part ( 70 ) and the stop ( 72 ) are housed. A fluid pump according to any one of claims 1 to 4, further comprising a plurality of ports ( 44 ) incorporated in the electrically insulating resin material ( 46 ) are poured, wherein the plurality of terminals ( 44 ) with the plurality of coils ( 42 ) are electrically connected, and an inclination restricting part ( 50 ) having a slope of the plurality of terminals ( 44 ) when the electrically insulating resin material ( 46 ) is poured. Fluid pump according to one of claims 1 to 5, wherein the stator core ( 92 ) a toroidal core ( 94 ), the circumferentially outer circumferential peripheries of the plurality of teeth ( 95 ) and each tooth of the plurality of teeth ( 95 ) with the toroidal core ( 94 ) is engaged. A brushless motor at least partially immersed in fluid, the brushless motor comprising: a stator core ( 30 . 82 . 92 ), which has a large number of teeth ( 33 . 85 . 95 ), which are arranged circumferentially, a plurality of coils ( 42 each by concentric winding of a wire around an outer peripheral circumference of the teeth ( 33 . 85 . 95 ) are formed, wherein the plurality of coils ( 42 ) circumferential magnetic poles in inner circumferential peripheries of the plurality of teeth ( 33 . 85 . 95 ), when the power is supplied thereto, the magnetic poles being controlled by controlling the plurality of coils (FIG. 42 ) supplied energy, a rotor ( 60 ) around the inner circumferential peripheries of the plurality of teeth ( 33 . 85 . 95 ) is rotatable, wherein the rotor ( 60 ) has an outer peripheral circumference corresponding to the inner circumferential peripheries of the plurality of teeth ( 33 . 85 . 95 ), wherein the outer circumferential periphery defines magnetic poles that are relative to a rotational direction tion of the rotor ( 60 ) are different from each other, an electrically insulating resin material ( 46 ), that between the multiplicity of teeth ( 33 . 85 . 95 ), which are circumferentially adjacent to each other, wherein the electrically insulating resin material ( 46 ) is poured such that the electrically insulating resin material ( 46 ) the plurality of coils ( 42 ), and the electrically insulating resin material ( 46 ) the plurality of coils ( 42 ) isolated from the fluid.