KR100573947B1 - 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 cylindrical frame made of a hermetically sealed container, a power transmission element accommodated in the cylindrical frame, and a compression element received in the cylindrical frame and driven by the power transmission element, the power transmission element having a stator and an inner side of the stator. Having a rotor rotatably installed and provided with a permanent magnet, the stator has a stator iron core and a stator coil wound around the stator iron core, and the stator iron core has a plurality of stator iron plates laminated thereon, and a stator iron core is laminated. It is characterized by supporting the stator in the frame via end plate rings provided on both end portions in the direction.

Frame, stator, rotor, adjuster iron core, electric compressor

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 an embodiment of the present invention, showing the Q-Q radial cross-sectional shape of FIG.

Fig. 3 is a diagram showing the shape of the end plate according to the embodiment of the present invention.

Fig. 4 is a diagram showing the relationship between the end plate and the stator core outer circumference according to the 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 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 outermost

37: Inner frame

38: fixing member insertion hole

39: end plate ring

40: end plate extension

41: fixing member protrusion

42: space part

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 a countermeasure against this noise, for example, in the electric compressor described in Japanese Patent Laid-Open No. 2001-342954 (Patent Document 1), the inner wall of the sealed container of the compressor and a part of the axial direction of the outer peripheral part of the stator core in contact with the inner wall are Cutting is proposed.

[Patent Document 1]

Japanese Patent Laid-Open No. 2001-342954

In the above prior art, the outermost shape of the outermost diameter of the stator iron core becomes two kinds, and stator iron cores are formed by in-mold lamination using caulking (coupling of concavities and convexities) by HAC using a hologram (usually a sequential transfer type). In this case, 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 comprising a stator and the stator. Has a rotor rotatably installed inside and provided with a permanent magnet, the stator has a stator iron core and a stator winding line wound on the stator iron core, and the stator iron core has a plurality of stator iron plates stacked up, A stator is supported by a frame via interposition members provided on both end sides of the stator core in the stacking direction.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail using 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, it demonstrates from the outline | summary of the electric compressor which concerns on embodiment of this invention.

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. The axial cross-sectional shape of the permanent magnet rotary electric machine as the transmission element shown in FIG. 1 is an X-X sectional view of the permanent magnet rotary electric machine shown in FIG. 3 is a view showing the end plate ring shape shown in FIG.

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 cover 3 and the lower cover 4 are sealed by welding (not shown) 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 crank rotating shaft 13 provided on the rotor 20 has an upper side as 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 slides through the oil hole 21 by the rotation of the crank rotating shaft 13. It is supplied to the upper bearing part 23 of a bearing type, and the lower bearing part 24 of a 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.

1, 2 and 3, the transmission element 5 consisting of a permanent magnet rotary electric machine consists of a stator 19 and a rotor 20, and the stator 19 includes a tooth 27 and a core back. Stator winding line 31 of concentrated winding wound in the slot 30 between the stator iron core 29 which consists of 28, and the tooth 27, and surrounds the tooth 27 (U phase of a three-phase winding line). Consisting of a winding line 31a, a V-phase winding line 31b, and a W-phase winding line 31c. The D-cut recessed part 32 is provided in the outer periphery of the stator iron core 29 of the part in which the tooth 27 is located.

Here, since the transmission element 5, which is a permanent magnet rotary electric machine, is 4 poles and 6 slots, the slot pitch is 120 degrees at the electric machine angle. The rotor 20 shown in Fig. 2 forms a permanent magnet insertion hole 34 in the vicinity of the outer circumferential surface of the rotor iron core 33 in which the rotating shaft hole 50 into which the rotating shaft (not shown) is inserted, A permanent magnet 35 made of rare earth neodymium is fixed in the permanent magnet insertion hole 34. Reference numeral 36 is the outermost circumference of the stator iron core 29, and becomes a concentric circle shape with the rotating shaft.

Reference numeral 37 is an inner circumferential surface of the frame 2, and is set slightly larger than the outermost circumference 36 of the stator iron core. In other words, the inner circumferential surface 37 of the frame 2 and the outermost circumference 36 of the stator iron core are set not to contact each other.

The fixing member insertion hole 38 is formed in the outer diameter side of the tooth 27 of the stator iron core 29. End plate rings 39 (upper end plate rings 39a and lower end plates) as interposing members shown in Figs. 3A and 3B are provided on both upper and lower sides of the stator 19 (both ends in the stacking direction). Ring 39b, and both have the same shape. Fig. 3A is a front view of the end plate ring 39 seen from the P direction in Fig. 1, and Fig. 3B is a sectional view taken along the line Y-Y. The end plate ring 39 is formed in a ring shape, and a plurality of end plate extensions 40 are provided in a portion of the inner circumference thereof, and the fixing member protrusion 41 (round rod shape) is provided on the end plate extension 40. To form.

In the method of fixing the stator 19 and the frame 2, first, the fixing member protrusion 41 of the end plate ring 39 is press-fitted into the fixing member insertion hole 38 formed in the stator 19, and then the end plate ring. (39) is fitted by heating to the inner circumferential surface 37 of the frame (2). Thus, the stator 19 is supported by the frame 2 via the end plate ring 29 provided in the both end side of the stator iron core 29 in the lamination direction.

Therefore, the stator 19 exhibits the toroidal vibration of the mode 2, but the vibration is the frame 2 as the toroidal vibration of the mode 2 since the stator core 29 is not in contact with the frame inner circumferential surface 37. Less vibration occurs.

Fig. 4 shows the relationship between the end plate ring and the stator core outermost circumference at the stator end.

In Fig. 4, since the stator core outermost circumference 36 is between the outer circumference and the inner circumference of the end plate ring 39, the end plate ring 39 is placed on both sides (both ends in the stacking direction) of the stator 19. When the fixing member protrusion 41 is placed in the fixing member insertion hole 38 and press-fitted, the stator 19 is pressed by the end plate ring 39 from both sides (both ends in the stacking direction). . At this time, a space portion 42 is formed between the fixing member protrusion 40 and the stator core outermost circumference 36. The space 42 existing between the fixing member protrusion 40 and the stator core outermost circumference 36 is lubricating oil of the oil reservoir 22 under the frame 2 by the rotation of the rotation shaft 13. It is supplied to the upper bearing portion 23 of the sliding bearing type via the oil hole 21, and serves as a passage for dropping the oil and returning it to the oil storage portion 22. As a result, lubrication is always maintained in both bearings 23 and 24.

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 was measured 1 m away from the position of the central portion of the axial direction of the transmission element 5 consisting 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 electric compressor used that the outermost circumference of the stator core 29 was similarly contacted over the lamination direction (axial direction).

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 reduced by about 10 kHz as compared with the conventional one, and a significant noise reduction is realized.

This noise reduction is achieved by supporting the upper and lower sides of the stator 19 (both ends in the stacking direction) with the end plate ring 39 to fix the end plate ring 39 to the inner circumferential surface 37 of the frame 2. Denotes the toroidal vibration of the mode 2, but the vibration is a result that the frame 2 vibrates due to the toric vibration of the mode 2 since the stator core 29 does not contact the inner circumferential surface 37 of the frame. Noise is also reduced.

Although the stator iron core 29 is laminated | stacked by laminating | stacking the stator iron plate punched by the press, this lamination | stacking is performed in the lamination type called holodie (common name, sequential transfer type). Since the outer diameter 36 of the stator iron core 29 coincides with the inner diameter of the lamination type, the outermost circumference 36 of the stator core 29 is well provided in the lamination direction (axial direction) without shifting the stator iron plate toward the diameter in the mold even when laminating in the mold. Laminated in the finished state.

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 compressor shown in Fig. 1 is called a scroll compressor, with a compression element at the top and a transmission element at the bottom. In another embodiment, there is a rotary compressor (not shown) having a structure in which the transmission element is located above (upper) and the compression element is located below (lower). 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.

Moreover, although one form of the end plate ring which is the interposition member was shown in embodiment of this invention, if it is a structure which does not make a stator iron core contact with a frame inner periphery, it is a matter of course that shapes other than an end plate ring may be sufficient. Various types of interposition members interposed at intervals between the end plate ring divided into a plurality, the stator core and the frame inner circumference can be used.

In addition, the electric compressor has a drop test. In order to endure this, if the axial length of the end plate is sufficiently taken, there is no problem. Thus, although not shown, the through hole may be opened in a part of the frame by shortening the axial length of the end plate, and the frame and the end plate may be fixedly attached by tack welding through the through hole.

 According to the present invention, since the stator is supported on the frame via interposition members provided on both end sides of the stator iron core in the stacking direction, the vibration of the stator is not transmitted to the frame, and noise generated from the electric compressor can be reduced. In addition, since the outer circumference of the stator iron core is in contact with the inner circumference of the hologram, the assembly of the stator iron core by in-mold lamination can be performed.

Claims (9)

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 core and a stator winding wound around the stator core, The stator iron core has a plurality of stator iron plates laminated, An electric compressor, wherein the stator is supported on the frame via interposition members provided on both end portions of the stator core in the stacking direction. 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 core and a stator winding wound around the stator core, The stator iron core has a plurality of stator iron plates laminated, An electric compressor, wherein the stator is supported on the frame via end plate rings provided on both end sides of the stator core in the stacking direction. 3. The motor-driven compressor according to claim 2, wherein the end plate ring is in contact with the inner circumferential surface of the frame and has an outer diameter larger than the outer circumference of the stator iron core. A fixing member protrusion is provided in said end plate ring, The motor-compressor provided with the fixing member insertion hole into which the said fixing member protrusion part is inserted in the both end surfaces of the stator iron core in the lamination direction. The through-hole penetrating the cylindrical frame is provided in a portion where the end plate ring is located, and the frame and the end plate ring are fixedly attached by welding at the portion of the through-hole. Motorized compressor. The motor-driven compressor according to claim 2, wherein a space portion through which lubricating oil flows exists between an inner circumferential surface of the end plate ring and an outer circumference of the stator iron core. 3. The motor-driven compressor according to claim 2, wherein the stator winding line is concentrated and wound on the teeth of the stator core. The motor-driven compressor according to claim 2, wherein the compression element is a scroll compressor, the compression element at the top, and the transmission element at the bottom. The motor-driven compressor according to claim 1, wherein the compression element is a rotary compressor, the compression element at the bottom, and the power transmission element at the top.

Images