KR100540096B1 - Electromotive compressor - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a permanent magnet rotary electric machine capable of assembling by in-mold lamination of a stator iron core and solving a noise problem.

A motor-driven compressor comprising a rolling element and a compression element driven by a rotating shaft connected to the rolling element, the cylindrical frame comprising a closed container, the stator core having a stator core and a stator winding in which the rolling element is held in the frame. It consists of a stator and a rotor which has a permanent magnet and is rotatably supported inside the stator, and a convex contact portion is provided on the outer circumference of the stator core in contact with the inner circumferential surface of the stator, and the outer circumferential area of the contact portion is the entire inner circumference of the frame. It is characterized by making it into several% or less.

Electric compressors, stator iron cores, stator coils, frames, contacts

Description

Electric Compressor {ELECTROMOTIVE COMPRESSOR}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view showing an axial cross-sectional shape showing a motor-driven compressor according to a first embodiment of the present invention.

FIG. 2 shows a permanent magnet rotary electric machine according to a first embodiment of the present invention, showing the Q-Q radial direction cross-sectional shape of FIG.

3 is a perspective view of a permanent magnet rotary electric machine according to a first embodiment of the present invention.

Fig. 4 is a diagram showing a stator iron plate contact situation in a frame according to the first embodiment of the present invention.

5 is a diagram showing noise measurement results of a motor-driven compressor equipped with a permanent magnet rotary electric machine.

Fig. 6 is a diagram showing the noise overall (OA) value of the electric compressor equipped with the permanent magnet rotary electric machine according to the first embodiment of the present invention.

Fig. 7 is a sectional view showing the axial cross-sectional shape of the motor-driven compressor 1 according to the second embodiment of the present invention.

8 is a cross-sectional view showing an axial cross-sectional shape of the motor-driven compressor 1 according to the third embodiment of the present invention.

9 is a cross-sectional view showing an axial cross-sectional shape of the motor-driven compressor 1 according to the fourth embodiment of the present invention.

10 is a cross-sectional view showing an axial cross-sectional shape of the motor-driven compressor 1 according to the fifth embodiment of the present invention.

Fig. 11 is a diagram showing a stator iron plate contact situation in a frame according to the fifth embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: electric compressor

2: frame

3: top cover

4: lower cover

5: electric element (permanent magnet rotary electric machine)

6: compression element (scroll compressor)

7: fixed scroll member

8, 11: end plate

9, 12: vortex wrap

10: turning scroll member

13: crank rotation axis

14: compression chamber

15: suction pipe

16 discharge port

17: fixed member

18: discharge pipe

19: stator

20: rotor

21: oil hole

22: oil reservoir

23: upper bearing part

24: lower bearing part

25: terminal

26: Die Sheet

27: Teeth

28: coreback

29: stator iron core

30: slot

31: stator winding

32: recess

33: rotor iron core

34: permanent magnet insertion hole

35: permanent magnet

36: stator iron core outsourcing

37: stator iron core outermost

38: turning

39: rotor shaft hole

40: space part

41: core outer shape

42, 45: fall prevention material

43: welding part

44: through hole

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor-driven compressor constituting a cooling device installed in an air conditioner, a refrigerator, a freezer, a showcase, or the like, and more particularly, to a motor-driven compressor using a permanent magnet rotary electric machine in which a permanent magnet is disposed on a rotor as an electric element.

Conventionally, in this type of permanent magnet rotary electric machine, intensive winding is employed in the stator winding line, and a rare earth neodymium permanent magnet is employed in the magnetic field. As a result, a compressor or the like using the same has a problem of increasing noise. As the noise countermeasure, for example, in the electric compressor described in Japanese Patent Laid-Open No. 2001-342954 (Patent Document 1), the inner wall of the airtight container of the compressor and the axial direction part of the stator core outer circumferential portion in contact with the inner wall To cut off is proposed.

[Patent Document 1]

Japanese Patent Laid-Open No. 2001-342954

In the above prior art, the outer circumferential shape of the outermost diameter of the stator iron core becomes two types, and the stator is formed by in-mold lamination using coking (coupling of concavities and convexities) by a nucleus (HAC) using a hologram (usually a sequential transfer type). In the case of forming the iron core, the in-mold lamination of the stator iron core in contact with the inner wall of the pressure vessel can be performed, but there is a problem that the in-mold lamination cannot be performed because there is no reference position for the stator iron core not in contact.

In the mold stacking, the outer periphery of the stator iron plate forming the stator core is set as a reference position so as to be stacked so as not to cause a position shift.

An object of the present invention is to provide an electric compressor that can be assembled by the in-mold lamination of the stator iron core can solve the noise problem.

The present invention has a cylindrical frame made of an airtight container, a transmission element accommodated in the cylindrical frame, and a compression element received in the cylindrical frame and driven by the transmission element, the transmission element being a stator and the stator. It has a rotor rotatably installed inside and provided with a permanent magnet, the stator has a stator iron core inserted and supported in the cylindrical frame, and a stator winding line wound on the stator iron core, and the stator iron core is laminated It has a plurality of stator plate to be formed, the stator plate has a convex contact portion in contact with the inner circumferential surface of the frame of the cylinder on the outer circumference, characterized in that the contact portion of each stator plate is connected in the stacking direction to be laminated.

Embodiments of the present invention will now be described in detail with reference to Figs. In each figure, common code | symbol shows the same thing. In addition, the permanent magnet rotary electric machine of 4 poles was shown here and ratio of the number of poles of a rotor and the number of slots of a stator was set to 2: 3.

First, the first embodiment of the present invention will be described.

Fig. 1 shows a motor-driven compressor according to a first embodiment of the present invention, shows an axial cross-sectional shape, and Fig. 2 shows a permanent magnet rotary electric machine according to the first embodiment of the present invention. The QQ radial direction cross-sectional shape of 1 is shown. An axial cross-sectional shape of the permanent magnet rotary electric machine as the transmission element shown in FIG. 1 is a P-O-P cross-sectional view of the permanent magnet rotary electric machine shown in FIG. 3 is a perspective view of the permanent magnet rotary electric machine shown in FIG. 4 is a diagram showing a stator plate contact situation in a frame.

In Fig. 1, the motor-driven compressor 1 is formed of a casing in appearance. The case is composed of a cylindrical frame 2, an upper lid 3 on the upper end side and a lower lid 4 on the lower end side. The frame 2 is a sealed container.

In the frame 2, there is housed a transmission element 5, which is a permanent magnet rotary electric machine, and a compression element 6 called a scroll compressor.

The frame 2 is formed by bending a plate-shaped steel plate into a cylindrical shape. The upper and lower ends of the frame 2 are closed by the upper lid 3 and the lower lid 4 to form a sealed container. The upper lid 3 and the lower lid 4 are sealed by welding to the frame 2.

The compression element 6 has a spiral wrap 9 which stands upright on the end plate 8 of the fixed scroll member 7 and a spiral wrap 12 which stands upright on the end plate 11 of the pivoting scroll member 10. Is formed by being engaged, and a compression operation is performed by turning the revolving scroll member 10 by the crank rotation shaft 13.

Of the compression chambers 14 (14a, 14b,...) Formed by the fixed scroll member 7 and the swinging scroll member 10, the compression chamber located on the outermost side has the two scroll members 7. Moving toward the center of 10) the volume is reduced in sequence. When the compression chambers 14a and 14b reach the vicinity of the center of both scroll members 7 and 10, the compressed gas from the suction pipe 15 in both compression chambers 14 is discharged in communication with the compression chamber 14 ( 16).

The discharged compressed gas reaches the frame 2 under the fixing member 17 through a gas passage (not shown) provided in the fixed scroll member 7 and the fixing member 17, and is installed on the side wall of the frame 2. It is discharged out of the electric compressor 1 from the discharge pipe 18.

Moreover, the electric element 5 which consists of a permanent magnet rotary electric machine which comprises the electric compressor 1 is controlled by the inverter (not shown) provided separately, and rotates at the rotational speed suitable for a compression operation. Here, the transmission element 5 which consists of a permanent magnet rotary electric machine consists of the stator 19 and the rotor 20 (not shown but the balance weight is attached to both ends of the rotor 20). The upper side of the rotating shaft 13 provided in the rotor 20 is a crank shaft. An oil hole 21 is formed inside the rotating shaft 13, and the lubricating oil of the oil storage part 22 in the lower part of the frame 2 is slid through the oil hole 21 by the rotation of the rotating shaft 13. Type is supplied to the upper bearing portion 23 of the type and the lower bearing portion 24 of the ball bearing type. Reference numeral 25 denotes a terminal for supplying electric power from the inverter to the electric element 5. 26 is a die sheet.

The electric element 5 made of the permanent magnet rotary electric machine shown in Figs. 1 and 2 is composed of a stator 19 and a rotor 20, and the stator 19 is a tooth 27 and a core back 28. In the slot 30 between the stator iron core 29 and the teeth 27, the stator winding wire 31 of the concentrated winding wound around the teeth 27 (the U-phase winding wire of the three-phase winding wire) 31a), the V-phase winding line 31b, and the W-phase winding line 31c]. A semicircular recess 32 is provided on the outer circumference of the stator iron core 29 at the portion where the tooth 27 is located.

Here, since the transmission element 5 which is a permanent magnet rotary electric machine is a 4-pole 6 slot, a slot pitch is 120 degree | times in an electric machine angle. The rotor 20 forms a permanent magnet insertion hole 34 near the outer circumferential surface of the rotor iron core 33 on which the rotating shaft hole 39 into which the rotating shaft (not shown) is inserted is formed. 34), a permanent magnet 35 made of rare earth neodymium is fixed. Reference numeral 36 is an outer circumference of the stator iron core 29, and has a concentric shape with the rotation axis.

1, 2, and 3, reference numeral 37 denotes the outermost circumference of the stator iron core and has a diameter slightly larger than the outer circumference 36 of the stator iron core. That is, the outer diameter 36 part of the stator iron core has a small outer diameter, and the outer diameter 36 part of the stator iron core has a large outer diameter.

If the outer circumference 36 of the stator iron core is made too small, the magnetic properties of the permanent magnet rotary electric machine will be deteriorated. Therefore, the deviation between the diameters of 36 and 37 is set within 0.5 mm.

On the outside of the outer circumference 36 of the stator iron core 29, two projections 38 (convex contact portions) consisting of 38a and 38b are formed, and the outer circumferential surface of the projection 38 (convex contact portions) is the stator iron core 29. It is set so that it may become the same diameter as the outermost periphery 37 of. Here, although two projections 38 (convex contact portions) are provided on the outer circumference of the slots 30 (the outer circumference between the recesses 32), one may be provided, and any number can be provided. The height of the projection 38 (convex contact portion) is about 0.3 mm and the width is about 0.5 mm. These projections 38 (convex contacts) are arranged so as to be connected in the stacking direction in which stator iron plates are stacked. The stator iron core is formed by laminating 0.35 mm or 0.5 mm electrical steel sheets (stator iron plates).

Here, since the frame 2 is formed by bending a plate-shaped steel sheet to form a cylindrical shape, the circumferential diameter dimension accuracy of the inner circumference is moderate, and usually ± 100 µm is varied in the diameter dimension. As a result, the stator iron core 29 of the stator 19 heat-fitting into the frame 2 cannot define where the inner circumference of the frame 2 and the outer circumference of the stator iron core 29 are in contact with each other. For this reason, although the radial cross-sectional shape of the POP cross section of the permanent magnet rotary electric machine of FIG. 2 was shown in FIG. 1, the contact with the inner peripheral surface of the frame 2 is the protrusion of the outermost periphery 37 of the stator iron core 29. As shown in FIG. (38) (convex contact portion), and the outer circumference 36 (the outer diameter is small) of the stator iron core does not contact the inner circumferential surface of the frame 2. As a result, any stator plate forming the stator core 29 is in contact with the inner circumference of the frame 2. However, the outer circumferential surface area of the projection 38 (convex contact portion) only contacts 1% with respect to the inner circumferential surface area of the frame 2.

In Fig. 4, the stator iron plate is heated and fitted on the inner circumferential side of the cylindrical frame 2 (usually 2.5 mm to 3.5 mm) via two projections 38 (convex contact portions) formed on the outer circumference of the stator iron plate. Supported by fit. By this heat fitting support, as shown in the part of the outer periphery shape 41 which shows only the outer periphery side of a stator iron plate, a space part is formed between the frame 2, the outer periphery 36 of the stator iron core, and the outermost periphery 37. 40) is formed.

In addition, the outer peripheral contact area of the projection 38 (convex contact portion) was set to 1% of the inner peripheral area of the frame 2 (including the axial length of the stator core). As a result, vibration of the stator core 29 is less likely to be transmitted to the frame 2.

5 is a graph showing the noise measured for the motor-driven compressor 1. This motor-driven compressor 1 has a nominal heating and cooling capacity of 2.2 kW to 2.8 kPa, and was operated by enclosing R410A as a refrigerant. The measurement microphone measured 1 m away from the position of the axial center part of the transmission element 5 which consists of a permanent magnet rotary electric machine.

Fig. 5 shows the frequency components on the horizontal axis and the noise on the vertical axis, together with the measurement data of the conventional electric compressor and the electric compressor of the present invention. In addition, the conventional motor-driven compressor has no projection 38 (convex contact portion) of the outer circumference of the fixed iron core 29, and the outer circumference 36 of the stator iron core 33 contacts the same in the stacking direction (axial direction). It was used.

As shown in Fig. 5, the noise of the motor-driven compressor 1 of the present invention is slightly higher than that of the 200 kHz, 400 kHz, 8 kHz, and 10 kHz components. The noise of the motor-driven compressor 1 is significantly smaller than before. 6 shows the noise overall (OA) value. As shown in Fig. 6, the noise of the motor-driven compressor 1 of the present invention is significantly reduced to 10.4 kW compared with the prior art.

This noise reduction is the same as the stacking direction (axial direction) of the stator iron core 29, and the contact area with the inner peripheral surface of the frame in the circumferential direction is 1% of the entire area of the inner circumference of the frame (by the axial length of the stator core 29). This is because vibration of the stator iron core 29 is hardly transmitted to the frame 2 by contact. Regarding the contact area of the projection 38 (convex contact portion) of the contact portion, even if it is originally 57.5% to 28.75%, there is no change in noise, so the one having the smaller contact area of several percent is preferable. This contact portion will be described in terms of the assembling surface of the stator core 29.

Although the stator iron core 29 is laminated | stacked by the press punched iron plate, this lamination | stacking is performed in the lamination type called a holodie (commonly known as a sequential transfer type). Since the outer diameter of the stator iron plate corresponding to the outermost circumference 37 (larger outer diameter) of the stator iron core 29 coincides with the inner diameter of the lamination type, the lamination of the stator iron plate in the mold without shifting the position in the radial direction is performed. It is laminated | stacked in the state well equipped in the direction (axial direction).

Therefore, it is possible to provide a stator iron core which is low in noise and which can be laminated using a stacked type called a hologram.

In addition, the stator iron plate laminated in the mold completes one by a strong assembly (stator iron core) by caulking (coupling of concavities and convexities) by HAC. The stator 19 formed by winding-up the stator winding wire 31 to the stator core 29 is fixed in the frame 2 by heat fitting.

Next, a second embodiment of the present invention will be described.

Fig. 7 shows a motor-driven compressor 1 of a second embodiment according to the present invention. FIG. 7 shows a cross-sectional shape as shown in FIG. 1, and another point is that a through hole 44 is provided in a part of the frame 2. As shown in FIG. This through hole 44 is provided in the part where the projection 38 (convex contact part) is located. The protrusion 38 (convex contact portion) of the stator 19 and the frame 2 were fixedly attached by tack welding through the through hole 44.

The outer diameter of the stator 19 of the permanent magnet rotary electric machine used for the electric compressor 1 of this invention is 105 mm and lamination thickness 45 mm. The compressor has a drop test, and if the stator 19 is displaced from the heating fitting position of the frame 2 due to the impact at the time of falling, the specification is not satisfied. For this reason, the through hole 44 is provided in a part of the frame 2, and the protrusion 38 (convex contact part) of the stator 19 and the frame 2 are tack-welded through this through hole 44, And fixed by the welding part 43. Thereby, the electric compressor 1 which can withstand a drop test can be provided.

Next, a third embodiment of the present invention will be described.

8 shows a motor-driven compressor 1 of a third embodiment according to the present invention. FIG. 8 shows a cross-sectional shape as shown in FIG. 1, and another is provided with a drop preventing material 42 in the lower part of the stator 19 in the inner circumference of the frame 2.

The ring-shaped fall prevention material 42 is heat-fitted to the frame 2, and the stator 29 is heat-fitted on the upper part of the fall prevention material 42 after that. The lower part of the projection 38 (convex contact part) is received by the fall prevention material 42.

Thereby, even if a drop test is performed, the stator 19 does not shift | deviate from a heat-insertion position, and the electric compressor 1 which can withstand a drop test can be provided.

Next, a fourth embodiment of the present invention will be described.

9 shows a motor-driven compressor 1 of a fourth embodiment according to the present invention. FIG. 9 shows a cross-sectional shape as shown in FIG. 1, the other being provided with a drop preventing material 45 at the lower part of the stator 19 in the inner circumference of the frame 2, and on a part of the frame 2; The through hole 44 is provided, and the frame 2 and the fall prevention material 45 are fixedly attached by tack welding via this through hole 44.

First, after the ring-shaped fall prevention material 45 is heat-fitted to the frame 2, the through hole 44 is provided in a part of the frame 2, and the fall prevention material 45 is passed through this through hole 44. ) And the frame 2 are tack-welded and welded by the welding part 43, and the stator 29 is heat-fitted on the upper part of the fall prevention material 45 after that. Thereby, even if a drop test is performed, the stator 19 does not shift | deviate from a heat-insertion position, and the electric compressor 1 which can withstand a drop test can be provided. Moreover, the fall prevention material 45 shortens an axial length rather than the fall prevention material 42 in order to reduce a use material, and uses tag welding together in order to ensure fall strength.

Next, a fifth embodiment of the present invention will be described.

FIG. 10 shows the motor-driven compressor 1 of the fifth embodiment according to the present invention, which is taken along the line BB in the radial direction in FIG. 10 in FIG. 11A, and in the direction AA in FIG. 10 in FIG. Shows. FIG. 11A is the same as FIG.

As is apparent from the outer circumferential shape 41 of the stator iron plate shown in Fig. 11B, six divided divided circumferences are formed between the semicircular recesses 32 on the outer circumference of the stator iron plate. The projection 38 (convex contact part) is not provided in three division outer peripheries, and the projection 38 (convex contact part) is not provided in the remaining three division outer peripheries. The part with protrusion 38 (convex contact part) and the part without protrusion 38 (convex contact part) are comprised so that it may be alternately arrange | positioned. The stator core outer periphery 36 of the part with the projection 38 (convex contact portion) is made the same as the stator core outermost periphery 37. The projection 38 (convex contact portion) is connected in the stacking direction. 11A, projections 38 (convex contact portions) are provided on all divided outer peripheries.

Fig. 10 shows a cross-sectional shape as shown in Fig. 1, and the other is a stator iron core with most of the shape of the stator core 29 in the inner circumference of the frame 2 as the shape of Fig. 11A. A part of the center part of (29) is made into the shape of FIG. 11 (b). That is, the stator iron plate of the stator iron core 29 has two types. One type of stator plate has projections 38 (convex contacts) on any divided outer circumference. The other type of stator plate has a portion without the projection 38 (convex contact portion) by the divided outer periphery. The projection 38 (convex contact portion) has a portion connected in the stacking direction and a portion not connected.

As a result, there is a portion where the inner circumference of the frame 2 and the stator iron core 29 are fixed by heating, so that even if the drop test is performed, the stator 19 does not deviate from the heating insertion position and does not require tag welding. An electric compressor 1 capable of withstanding the drop test can be provided. Moreover, although the noise reduction effect is lower than FIG. 1, the noise reduction effect can be ensured compared with the past.

In addition, of course, even if only the shape of FIG. 11 (b) is adopted with respect to the embodiment of FIG.

Here, the compressors shown in Figs. 1, 7, 8, 9 and 10 are referred to as scroll compressors, and the compression element is arranged at the top and the transmission element is arranged at the bottom. Alternatively, there is a rotary compressor having a structure in which a transmission element is located above and a compression element is located below. This rotary compressor has a structure without a bearing on the upper side. This is to make manufacturing cost low. Moreover, the electric compressor of this invention can be applied also to this rotary compressor.

According to the present invention, the shape of the stator iron core is the same as in the axial direction, and has a contact portion on the outer circumference of the stator iron core, so that assembly by in-mold stacking of the stator iron cores is possible. It is also possible to provide a low noise electric compressor.

Claims (10)

A cylindrical frame made of a hermetically sealed container, a transmission element accommodated in the cylindrical frame, and a compression element received in the cylindrical frame and driven by the transmission element, The transmission element has a stator and a rotor rotatably installed inside the stator and provided with a permanent magnet, The stator has a stator iron core inserted into and supported in the frame of the cylinder, and a stator winding line wound around the stator iron core, The stator iron core has a plurality of stator iron plates laminated, The stator iron plate has a convex contact portion that contacts the inner circumferential surface of the cylindrical frame on its outer circumference, and the contact portions of each stator iron plate are connected in a lamination direction in which they are stacked. The motor-driven compressor according to claim 1, wherein a ratio between the outer circumferential area of the contact portion and the entire inner circumferential area of the cylindrical frame is several percent or less. The motor-driven compressor according to claim 1, wherein a through hole penetrating the cylindrical frame is provided in a portion where the contact portion is located, and the frame and the contact portion are fixedly attached by welding at a portion of the through hole. . 2. The electric compressor according to claim 1, wherein a drop preventing material which the lower portion of the contact portion touches is formed on the inner circumference of the frame of the cylinder. 5. The motor-driven compressor according to claim 4, wherein a through hole is provided in a part of the cylindrical frame, and the frame and the fall prevention material are fixed by welding at a part of the through hole. The motor-compressor according to claim 1, wherein the stacked stator iron plates are coked with each other by a hack to form a stator iron core, and the stator iron cores are heat-fitted to the frame. A cylindrical frame composed of a hermetically sealed container, a transmission element accommodated in the cylindrical frame, and a compression element accommodated in the cylindrical frame and driven by the transmission element, The transmission element has a stator and a rotor rotatably installed inside the stator and provided with a permanent magnet, The stator has a stator iron core inserted into and supported in the frame of the cylinder, and a stator winding line wound around the stator iron core, The stator iron core has a plurality of stator iron plates laminated, A plurality of recesses are provided on the outer circumference of the stator iron plate, On the divided outer circumference of the stator plate divided by the concave portion, a portion forming a convex contact portion in contact with the inner circumferential surface of the cylindrical frame and a portion not formed are provided, and the contact portions of the stator iron plates are laminated in a lamination direction in which they are stacked. An electric compressor characterized by the following. A cylindrical frame composed of a hermetically sealed container, a transmission element accommodated in the cylindrical frame, and a compression element accommodated in the cylindrical frame and driven by the transmission element, The transmission element has a stator and a rotor rotatably installed inside the stator and provided with a permanent magnet, The stator has a stator iron core fitted into and supported in the frame of the cylinder, and a stator winding line wound around the stator iron core, The stator iron core has a plurality of stator iron plates laminated, A plurality of recesses are provided in the outer circumference of the stator iron plate, At least two types of the stator iron plate having the divided outer periphery divided by the recessed portion, One has a convex contact portion in contact with the inner circumferential surface of the cylindrical frame on either side of the divided outer circumference, The other is the part with and without the convex contact part by the division outer circumference, The motor-compressor, characterized in that connected in the stacking direction in which the contact portion of each stator iron plate is laminated. The motor-driven compressor according to claim 1, wherein the stator winding line is concentrated and wound on the teeth of the stator core. The motor-driven compressor according to claim 1, wherein the compression element is a scroll compressor, the compression element at the top, and the transmission element at the bottom.

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