JPH05180191A - Electric motor integral with pump - Google Patents

Abstract

PURPOSE:To make an electric motor pump compact by using a rotor iron core with multiple gears commonly as an impeller of a viscous pump. CONSTITUTION:An electric motor comprises a stator 2 being composed of a stator iron core 6 with multiple internal gears 6a to 6e on its inner surface and three-phase stator coils 7a to 7e wound around the multiple internal gears 6a to 6e and a rotor 3 being composed of a rotor iron core 8 with multiple external gears 8a to 8d on its outer surface and a rotating shaft 9 for holding the rotor iron core 8. Also an air inlet line 22 for sucking air into a gap 24 formed between the multiple internal gears 6a to 6e and the multiple external gears 8a to 8d and an air outlet line 23 for exhausting air from the gap 24 are formed integrally in the stator iron core 6. Then the rotor iron core 8 with the multiple external gears 8a to 8d and multiple grooves 8e to 8h on its outer surface is activated as an impeller of a viscous pump.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump-integrated electric motor.

[0002]

2. Description of the Related Art Conventionally, an electric pump has a viscous pump portion having an impeller for pressurizing a fluid by rotating the viscous pump portion.
The viscous pump unit is composed of two different types of elements such as a motor unit that rotationally drives the impeller.

[0003]

However, in the conventional electric pump, there is a limit to miniaturization because it is composed of two different types of elements, the motor section and the impeller of the viscous pump section. An object of the present invention is to provide a pump-integrated electric motor in which the rotor iron core having a plurality of teeth is also used as an impeller of a viscous pump to reduce the size of the electric pump.

[0004]

The present invention has a stator having a stator core around which a stator winding is wound, and a rotor core arranged so as to face the stator core. A rotor having a plurality of teeth on the side of the rotor core facing the stator core, a suction path for sucking fluid into the gap between the stator core and the rotor core, and discharging fluid from the gap. The technical means provided with a discharge path for

[0005]

In the present invention, when the rotor rotates as an electric motor,
The rotor core having a plurality of teeth acts as an impeller of the viscous pump, and the fluid existing in the gap between the stator core and the rotor core is discharged from the discharge passage. At this time, since a negative pressure is generated in the gap, fluid is sucked into the gap from the suction passage, so that the plurality of tooth portions of the rotor core continue to rotate, thereby operating as a viscous pump.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A pump-integrated electric motor according to the present invention will be described based on an embodiment shown in FIGS. 1 and 2
FIG. 3 is a diagram showing a pump-integrated electric motor to which an embodiment of the present invention is applied. The pump-integrated electric motor 1 uses a variable reluctance type stepping motor, and includes a stator 2, a rotor 3, a housing 4, and an energization control circuit 5 (see FIGS. 3 to 5).

The stator 2 has a plurality of inner teeth 6a to 6 on its inner circumference.
The stator core 6 has a stator core 6 and three-phase stator windings 7a to 7e wound around a plurality of inner teeth 6a to 6e of the stator core 6. Stator core 6
Has a substantially cylindrical shape and is formed by laminating a plurality of iron plates and silicon steel plates in the axial direction. A barrier 21 is provided on the inner circumference of the stator core 6 to smooth the flow of air flowing into the stator core 6, and an intake passage 22 for sucking air into the barrier 21 and the barrier 21 are provided. A discharge passage 23 for discharging air from the inside is integrally formed. The barrier 21 has a cylindrical shape made of a non-magnetic material (for example, stainless steel or resin), and has an outer periphery having a plurality of inner tooth portions 6 a to 6 a of the stator core 6.
It is joined to e by adhesion or the like, and the inner circumference faces the rotor 3 via a gap (for example, about 0.5 mm) 24. Further, the barrier 21 is formed with an inlet 25 and an outlet 26 which communicate with the inlet 22 and the outlet 23, respectively.

The stator winding 7a is wound around the inner tooth portion 6a, and excites the inner tooth portion 6a when a current flows. The stator windings 7b and 7d are respectively wound around the facing inner tooth portions 6b and 6d, and when the current flows, the inner tooth portions 6b and 6d are excited. The stator windings 7c and 7e have inner tooth portions 6c,
6e is wound around each of the teeth 6e, and the inner teeth 6
Excite c and 6e.

The rotor 3 has a plurality of outer tooth portions 8a to 8 on its outer circumference.
The rotor core 8 having d, the rotary shaft 9 holding the rotor core 8 and the like. Rotor core 8
Forms a magnetic circuit together with the stator core 6 and has grooves 8e to 8h between adjacent external tooth portions 8a to 8d. The plurality of outer tooth portions 8a to 8d are the plurality of tooth portions of the present invention and are excited when the three-phase stator windings 7a to 7e are sequentially energized. Further, the plurality of outer tooth portions 8 a to 8 d pump the air existing in the gap 24 when performing relative rotational movement with the stator 2. The rotating shaft 9 is mounted on the housing 4 with bearings 31, 32.
It is rotatably supported via and transmits the driving force to the outside of the housing 4. Both ends of the rotary shaft 9 project from the housing 4 so that driven members such as a fan and a pulley can be attached thereto.

3 to 5 are diagrams showing the energization control circuit 5 for the stator windings 7a to 7e. The energization control circuit 5 is
As shown in FIGS. 3 to 5, the switch 5 that electrically connects the stator winding 7a and the battery 10 when closed.
a, when closed, the stator windings 7b and 7d and the battery 10
And a switch 5c that electrically connects the stator windings 7c and 7e to the battery 10 when closed, and the switches 5a to 5e.
The excitation timing of the stator windings 7a to 7e is controlled by turning on and off c at a predetermined timing.

The operation of the pump-integrated electric motor 1 will be briefly described with reference to FIGS. 1 to 5. First, when the switch 5a is turned on, the switches 5b and 5c are turned off, and the energizing current flows only through the stator winding 7a, the stator winding 7a is excited and the inner tooth portion 6a of the stator iron core 6 and the rotor iron core 6a. 8
Magnetic flux flows through the plurality of outer tooth portions 8a and 8c. Then, as shown in FIG. 3, the outer tooth portion 8a of the rotor core 8 is attracted to a position where the magnetic resistance is minimized, and the outer tooth portion 8a of the rotor core 8 becomes the inner tooth portion of the stator core 6. Stop at the position facing 6a.

Next, when the switch 5b is turned on, the switches 5a and 5c are turned off, and a current flows through only the stator windings 7b and 7d, the stator windings 7b and 7d are excited and the stator core 6 Magnetic flux flows through the tooth portions 6b, 6d and the plurality of outer tooth portions 8b, 8d of the rotor core 8. Then, as shown in FIG. 4, the outer tooth portion 8b of the rotor core 8 is attracted to the position where the magnetic resistance is minimized, and the outer tooth portion 8d of the rotor core 8 is positioned at the position where the magnetic resistance is minimized. Be sucked. Therefore, the rotor 3 rotates in the direction of the arrow in FIG.
As shown in FIG. 5, the outer tooth portions 8b and 8d of the rotor core 8 are
Moves to a position facing the inner teeth 6b and 6d of the stator core 6.

Next, when the switch 5c is turned on, the switches 5a and 5b are turned off, and the energizing current flows only through the stator windings 7c and 7e, the stator windings 7c and 7e are excited and the stator core 6 Magnetic flux flows through the tooth portions 6c, 6e and the plurality of outer tooth portions 8a, 8c of the rotor core 8. Then, as shown in FIG. 5, the outer tooth portion 8c of the rotor core 8 is attracted to the position where the magnetic resistance is minimum, and the outer tooth portion 8a of the rotor core 8 is located at the position where the magnetic resistance is minimum. Be sucked. Therefore, the rotor 3 rotates in the direction of the arrow shown in FIG.
As described above, the energization control circuit 5 selectively turns the switches 5a to 5c on and off at predetermined timings, whereby the rotor 5 continues to rotate in the direction of the arrow shown in FIG. As a result, when the rotor 3 rotates in the direction of the arrow shown in FIG. 1, the rotational force of the rotor 3 is transmitted from the rotary shaft 9 to the external driven member, and acts as a known variable reluctance stepping motor.

Here, since a plurality of outer tooth portions 8a to 8d and a plurality of groove portions 8e to 8h are alternately formed on the outer circumference of the rotor iron core 8, they are uneven, and the inner peripheral surface of the barrier 21 is formed. The gap 24 between the outer peripheral surfaces of the plurality of outer tooth portions 8a to 8d is also small, for example, about 0.5 mm. As a result, the plurality of outer tooth portions 8a to 8d of the rotor core 8 act as impellers of the viscous pump. Therefore, the plurality of outer tooth portions 8a of the rotor core 8 are
When ~ 8d rotates in the direction of the arrow shown in FIG. 1, the air in the gap 24 also starts rotating in the direction of the arrow shown in FIG. 1, and is discharged from the discharge passage 23 through the discharge port 26. In this way, when air is discharged from the discharge passage 23, a negative pressure is generated in the gap 24, so that the suction port 2
Air is sucked into the gap 24 through the suction passage 22 via the valve 5.

As described above, the pump-integrated electric motor 1 of this embodiment has a structure in which the conventional viscous pump and the variable reluctance type stepping motor are integrated, so that the electric pump can be greatly downsized. it can. Also,
Since both ends of the rotary shaft 9 are both free ends, not only the viscous pump itself can operate, but also the drive source that drives a driven member such as a fan or a pulley.

In this embodiment, the present invention is applied to a variable reluctance type stepping motor, but the present invention is applied to a stepping motor such as a synchronous inductor type stepping motor and a hybrid PM type stepping motor, a geared motor,
It may be applied to a multistage stepping motor. Although air is used as the fluid in the present embodiment, a gas other than air or a liquid such as water or oil may be used as the fluid. In the present embodiment, the suction passage 22 and the discharge passage 23 are formed integrally with the stator core 6, but at least one of the suction passage and the discharge passage may be formed in the housing 4.

[0017]

According to the present invention, the electric pump can be miniaturized by adopting a structure in which a plurality of tooth portions formed on the outer periphery of the rotor core of the electric motor act as impellers of the viscous pump.

[Brief description of drawings]

FIG. 1 is a sectional view to which an embodiment of the present invention is applied.

FIG. 2 is another sectional view to which an embodiment of the present invention is applied.

FIG. 3 is an explanatory view of the operation to which the embodiment of the present invention is applied.

FIG. 4 is an explanatory view of the operation to which the embodiment of the present invention is applied.

FIG. 5 is an operation explanatory view to which the embodiment of the present invention is applied.

[Explanation of symbols]

 1 Pump Integrated Motor 2 Stator 3 Rotor 6 Stator Iron Core 8 Rotor Iron Core 22 Suction Path 23 Discharge Path 24 Gap 7a Stator Winding 7b Stator Winding 7c Stator Winding 7d Stator Winding 7e Stator Winding 8a Multiple external tooth portions (multiple tooth portions) 8b Multiple outer tooth portions (multiple tooth portions) 8c Multiple outer tooth portions (multiple tooth portions) 8d Multiple outer tooth portions (multiple tooth portions)

Claims (1)

[Claims] 1. A stator having (a) a stator core around which a stator winding is wound, and (b) a rotor core disposed so as to face the stator core, and the rotor is provided. A rotor having a plurality of teeth on a side of the iron core facing the stator core; (c) a suction path for sucking fluid into a gap between the stator core and the rotor core; (d) the gap A pump-integrated electric motor equipped with a discharge path that discharges more fluid.