KR20130094657A

KR20130094657A - Electronic compressor

Info

Publication number: KR20130094657A
Application number: KR1020120016074A
Authority: KR
Inventors: 정경훈; 조성국; 배병준; 임권수
Original assignee: 한라비스테온공조 주식회사
Priority date: 2012-02-16
Filing date: 2012-02-16
Publication date: 2013-08-26

Abstract

PURPOSE: An electric compressor is provided to suppress the decrease of efficiency in assembling a rotor due to a cover plate and the increase of the weight or unit cost of the rotor and to improve work efficiency and productivity of the same. CONSTITUTION: An electric compressor comprises a driving unit (3), a compressing unit (5), and a control unit (7). The driving unit generates driving power by the interaction between a stator winding a coil to be fixed to the inner periphery of the housing of the driving unit and form through holes along a shaft line and a rotor inside the stator. The compressing unit is connected to one end of the driving unit and compresses refrigerant flowing from a circling scroll, which synchronically turns, and the housing of the driving unit. The control unit controls the operation of the driving unit.

Description

Electric compressor {Electronic compressor}

The present invention relates to an electric compressor, and more particularly, a plurality of permanent magnets circumferentially inserted into a rotor core housing of a rotor and a weight fixed to the rotor core housing by the fixing means such as rivets and the fixing means. The present invention relates to a motor-driven compressor that allows for simpler and more stable restraint and mounting through balance.

In general, a compressor used in a vehicle cooling system serves to compress a refrigerant, and has been developed in various forms. In recent years, development of an electric compressor has been actively performed as a hybrid vehicle has been spotlighted as a low fuel consumption and high fuel efficiency measure. The motor-driven compressor is driven by a motor and an inverter instead of a conventional belt driving method, and is generally composed of a drive unit, a compression unit, and a control unit.

Here, first, the drive unit includes a drive unit housing forming an outer body, and a stator and a rotor coaxially mounted in the drive unit housing. Further, the compression section comprises a compression section housing constituting the outer body and coupled to the rear of the drive section housing, and an orbiting scroll and a fixed scroll mounted to rotate relative to each other in the compression section housing. In addition, the control unit is configured to include a cover housing coupled to the front of the drive housing and forming various types of drive circuits and devices such as a PCB mounted inside the cover housing.

Therefore, when the refrigerant is to be compressed by the electric compressor, external power is first applied to the control unit through a connection end, and thus the control unit transmits an operation signal to the driving unit through a driving circuit.

When the operation signal is transmitted to the driving unit, the electromagnet-shaped stator pressed into the inner circumferential surface of the driving unit is excited to become magnetic, so that the rotor rotates at high speed by electromagnetic interaction with the rotor.

In this way, when the rotating shaft of the drive unit rotates at a high speed, the turning scroll of the compression unit eccentrically coupled to the rear end of the rotating shaft is synchronously revolved about the rotating shaft, thereby interacting with the fixed scroll that is faced in the opposite state. The high pressure compression of the scroll outer circumference of the refrigerant fluidly connected to the compression unit from the drive unit is discharged to the refrigerant line.

In order to cause the compression operation as described above, the swinging scroll should be rotated eccentrically with respect to the axis of rotation of the driving unit, and the rotor of the driving unit couples the rotational scroll to one end of the axis of rotation 137, as shown by reference numeral 140 in FIG. The eccentric shaft 141 protrudes, and thus, in the process of revolving the swing scroll through the eccentric shaft 141, lateral fluctuations occur in the entire rotation axis 137, and in order to suppress such lateral fluctuations, 1 and 2, weight balances 143-1 and 143-2 are mounted in opposite directions with the eccentric shaft 141 on both end surfaces of the rotor core 139.

As such, the rotor 140 used in a conventional electric compressor is a radially outer portion of the hollow cylindrical rotor core housing 161 as shown in FIG. 2 to magnetize the rotor core 139. A plurality of plate-shaped permanent magnets 163 are inserted in the circumferential direction and are arranged while maintaining a right angle in a direction perpendicular to the normal, so that the permanent magnets 163 inserted in the rotor core housing 161 are separated in the axial direction. In order to prevent this, as shown in FIG. 1, the cover plates 164 are attached to both ends of the rotor core housing 161 and riveted through the fastening holes 166 of the rotor core housing 161 shown in FIG. 2. 165 is driven to fix both ends of the rotor core housing 161 by the cover plate 164.

However, the cover plate 164 as described above, for example, before the weight balance 143-1, 143-2 to the rotor core housing 161 by a fixing means such as the rivet 165 shown in the weight balance 143- 1, 143-2 and the rotor core housing 161 to be interposed in advance to prepare the bar, the rotor 140 for fixing the weight balance (143-1, 143-2) to the rotor core housing 161 Since the assembly work of the assembly is cumbersome, the work efficiency is lowered, while the weight of the rotor 140 is increased, and the manufacturing cost of the compressor is increased by increasing the number of parts.

In addition, the cover plate 164 is in close contact with the permanent magnet 163 during assembly, and when the cover plate 164 is made of a magnetic metal that is relatively inexpensive compared to the nonmagnetic metal, causing the leakage of magnetic flux generated in the permanent magnet 163 There is also a problem in that the driving torque generated by the linkage between the permanent magnet 163 and the stator coil is partially reduced, thereby lowering the efficiency of the electric compressor.

The present invention has been proposed to solve the problems of the conventional electric compressor as described above, by omitting the cover plate to prevent the separation of the permanent magnet inserted into the rotor core housing, assembly of the rotor due to the cover plate The purpose of the present invention is to improve the working efficiency and productivity of the electric compressor by suppressing the decrease, the weight, and the increase in the price, and to prevent the magnetic flux leakage of the rotor core through the cover plate.

In order to achieve the above object, the present invention is achieved by the interaction of a stator having a coil wound so as to form a through hole along an axis and a rotor rotatably axially supported on the drive housing within the stator. A driving unit generating a rotational driving force; A compression unit coupled to one end of the driving unit to compress the refrigerant introduced from the driving unit housing by a compression action of a rotating scroll synchronously rotating by a rotational driving force generated by the driving unit and a fixed scroll formed to correspond to the rotating scroll; And a control unit electrically connected to the stator of the driving unit to control an operation of the driving unit, wherein the rotor comprises: a rotation shaft arranged along a central axis; A rotor core attached to an outer circumferential surface of the rotating shaft to generate magnetic flux; An eccentric shaft which protrudes at one end of the rotating shaft to cause the compression action by revolving the pivoting scroll about the rotating shaft; And a weight balance attached to both ends of the rotor core to offset fluctuations generated in the rotational shaft due to the eccentric shaft, wherein the rotor core comprises the weight balance and the weight balance of the rotor core. Provided is an electric compressor adapted to fix a permanent magnet inserted into the rotor core by fixing means fixed to the housing.

The rotor core may further include a hollow cylindrical rotor core housing having a hole through which the rotating shaft is inserted along an axis; A plurality of permanent magnets inserted and aligned at right angles to a radially outer portion of the rotor core housing; And fixing means for fixing the weight balance to the rotor core housing at one end, and blocking the other end of the permanent magnet blocked at one end by the weight balance at the other end, thereby restraining the permanent magnet in the rotor core housing in the axial direction. It is preferable that it consists of;

In addition, the fixing means is preferably a rivet that is inserted into the rotor core housing on the opposite side of the one weight balance, the head restrains the permanent magnet in the axial direction when fixing the weight balance. .

In addition, it is preferable that the fixing means extends one side of the head that restrains the permanent magnet in the axial direction when the weight balance is fixed to the rotor core housing to the opposite side of the permanent magnet.

In addition, the fixing means is preferably formed in the magnetic contact portion of the non-magnetic material portion of the head in contact with the permanent magnet.

According to the motor-driven compressor according to the present invention, a plurality of permanent magnets inserted into the rotor core housing are provided in the axial direction by a weight balance and fixing means such as rivets for fixing the weight balance to the rotor core housing without a separate cover plate. Since restraining from the rotor core housing can be prevented, the manufacturing cost and weight of the compressor can be reduced as well as the number of assembly operations of the compressor as the cover plate is omitted, thereby improving the overall working efficiency and productivity of the compressor.

In addition, since the magnetic flux generated in the permanent magnet can be prevented from leaking through the cover plate which is in contact with the permanent magnet during assembly, an increase in driving torque of the compressor can be expected as part of the leakage is prevented.

1 is a perspective view showing a rotor used in a conventional electric compressor.
FIG. 2 is a perspective view of the rotor core shown in FIG. 1. FIG.
3 is a longitudinal front view of the electric compressor according to the present invention;
4 is a front sectional view of the rotor shown in FIG.
5 is a perspective view of the rotor core shown in FIG. 4.
6 is a side view of Fig.
7 is a side view of a rotor core according to another embodiment of the present invention.
8 is a perspective view of the fixing means shown in FIG.
9 is a front sectional view of a rotor core according to another embodiment of the present invention.
10 is a partially enlarged perspective view of the fixing means shown in FIG. 9;

Hereinafter, a motor-driven compressor according to an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown by reference numeral 1 in FIG. 3, the motor-driven compressor according to the present invention includes a driving unit 3, a compression unit 5, and a control unit 7.

Here, first, the drive unit 3 is a drive source for generating the rotational power of the compressor 1, as shown in Figure 3, the drive housing 31 forming the outer body, the stator 35 fixed in the drive housing 31 And the rotor 40 which rotates inside the stator 35, the driving part housing 31 may have an intermediate housing 32 interposed between the compression part 5.

Here, the drive unit housing 31, as shown in Figure 3, as a part forming the outer body of the drive unit 3, it is generally formed in a cylindrical shape as shown, one side toward the adjacent intermediate housing 32 It is open and on the opposite finishing surface 21, the rotation shaft 37 of the rotor 40 is rotatably supported by the bearing 23.

In addition, the stator 35 is a driving part for generating a rotational driving force together with the rotor 40 mounted coaxially inside, and as shown in FIG. 3, it is press-fitted on the inner circumferential surface of the drive housing 31 as a kind of electromagnet. And a stator core 36 fixedly mounted by the like and a bundle of coils 33 wound around the stator core 36. Here, the stator core 36 is a hollow cylindrical member as shown in the drawing, and has a through hole into which the rotor 40 is inserted on the central axis, and a plurality of ribs are radially inwardly formed on the inner circumferential surface of the stator core 36. Protruding into the circumferential direction to form a through hole, wherein the rib extends long along the axial direction of the stator core 36 to wind the coil 33.

In addition, the rotor 40 is coaxially mounted inside the stator 35 to drive rotation as mentioned above, as shown in FIG. 3, the stator core 36 of the stator 35. It is rotatably inserted into the through-hole formed in the center of the bar, consisting of a rotating shaft 37 arranged along the central axis and a rotor core 39 attached to the outer peripheral surface of the rotating shaft 37.

Therefore, the rotor 40 is driven to rotate by interaction with the stator 35 in accordance with the driving principle of the motor when the stator 35 is excited, as shown in Figures 3 and 4, the rotating shaft 37 ), The rotor core 39, the eccentric shaft 41, and the weight balance 43-1, 43-2.

Here, the rotation shaft 37 is arranged along the central axis of the rotor 40, as mentioned above, so as to be rotatable in the drive housing 31 and the intermediate housing 32 via bearings 23, 24. Supported.

In addition, the rotor core 39 is attached to the outer circumferential surface of the rotating shaft 37 to generate magnetic flux, and is provided with permanent magnets in various forms and arrangements for optimizing linkage with the stator 35. For example, FIG. As shown in FIG. 5 and FIG. 6, the rotor core housing 61, the permanent magnet 63, and the fixing means 65 are provided.

Here, the rotor core housing 61 is a cylindrical member constituting the outer body, a through hole 62 for inserting the rotation shaft 37 is formed along the axis line, and the coolant distribution hole 67 through which the coolant passes. Fastening holes for fitting the fixing means 65, such as and rivets are plurally penetrated around the through hole (62). In addition, the permanent magnet 63 is a portion for generating the magnetic flux of the rotor core 39, a plurality of bars are inserted into the outer portion of the rotor core housing 61 so as to maintain a mutual conformal angle, as shown in FIG. As shown, it should be arranged to be orthogonal to the normal of the outer circumferential surface of the rotor core housing 61. And, the fixing means 65 is a fastening member for fixing the weight balance (43-1, 43-2) on both ends of the rotor core housing 61, as long as it can perform the fastening function as described above It is also possible to use it, but the body 73 and its one end that are elongated as shown in Fig. 8 to penetrate the rotor core housing 61 and the weight balance 43-1, 43-2 as in this embodiment. It is preferable to use a rivet consisting of the head 71 formed in the.

In particular, in the present embodiment, the fixing means 65 is inserted into the fastening hole of the rotor core housing 61 at the side without the weight balance 43-1, 43-2, as shown in FIGS. 4 to 6. At the end of the body 73, the weight balance 43-1, 43-2 is fixed to the end surface of the rotor core housing 61, thereby permanently closing one end by the weight balance 43-1, 43-2. The other end of the magnet 63 is blocked by the opposite head 71 to restrain the permanent magnet 63 inserted in the rotor core housing 61 in the axial direction.

At this time, the fixing means 65 may block the part of the permanent magnet 63 by making the head 71 slightly larger than a general rivet head, but as another embodiment, as shown in FIGS. 7 and 8, the rotor When the weight balances 43-1 and 43-2 are fixed to the core housing 61, one side 75 of the head 71 that restrains the permanent magnet 63 in the axial direction is opposite to the permanent magnet 63. By extending to the side can restrain the restraint on the permanent magnet (63) more stably.

Furthermore, the fixing means 65 is a modified form of the above embodiment, and as shown in FIGS. 9 and 10, the portion of the head 71 in contact with the permanent magnet 63 is formed by the magnetic cavity 77. The magnetic void portion 77 is made of a high density nonmagnetic metal such as copper, for example, and is brought into contact with the end surface of the permanent magnet 63 as shown in FIG. The magnetic flux is prevented from being leaked through the head 71 of the fixing means 65, which is a magnetic body, without being converted into the driving torque by the linkage with the stator 35. Therefore, in the present embodiment, there is no fear of magnetic flux leakage, so that the area of the head 71 in contact with the permanent magnet 63 can be further widened to more stably restrain the permanent magnet 63.

On the other hand, the eccentric shaft 41 is a portion that allows the rotation of the rotor 40, that is, the rotation shaft 37 to be switched to the revolution of the swing scroll 53, protrudes so as to be eccentric with the axis on one end of the rotation shaft 37 By being connected to the scroll 53, the orbiting scroll 53 is idling about the rotation axis 37, thereby compressing the refrigerant by interaction with the fixed scroll 55.

Finally, the weight balance 43-1, 43-2 is a portion that cancels the fluctuations generated in the rotational shaft 37 due to the eccentric shaft 41, and as shown in FIGS. 3 to 6, the rotor It is attached to both ends of the core 39, and as shown in FIG. 4, at an end near the eccentric shaft 41 of the rotor core 39 about the axis of rotation shaft 37, on the opposite side of the eccentric shaft 41. That is, at an angular interval of 180 °, on the contrary, at the end far from the eccentric shaft 41, it is attached to the same side as the eccentric shaft 41, that is, without the angular interval.

On the other hand, the compression unit 5 is a portion compressing the refrigerant by rotating by the rotational driving force generated in the driving unit 3, as shown in Figure 3, which is connected to the rear end of the rotary shaft 37 of the driving unit 3 Bar, a compression section housing 51 forming an outer body, a swing scroll 53 rotatably mounted in the compression section housing 51, and a pair of rotation scrolls 53 to compress the refrigerant to compress the compressor (1). It is configured to include a fixed scroll 55 for discharging to the outside.

Here, the compression unit housing 51 is a cylindrical body open toward the driving unit 3, and forms an outer body of the compression unit 5, and the intermediate housing 32 interposed between the driving unit 3 and the driving unit 3 is formed. The refrigerant is discharged through the discharge port 58 which is coupled to the rear surface and is opened at one side of the wall surface of the rear head 57 coupled to the rear surface.

In addition, the revolving scroll 53 has a spirally curved revolving scroll wrap 59 formed to protrude to the rear side so as to converge toward the center, and the rotational axis of the driving unit 3 at the center of the revolving scroll wrap 59 is formed. The eccentric shaft 41 of 37 is engaged to revolve in synchronization with the rotor 40 about the rotation shaft 37.

In addition, the fixed scroll 55 is mounted in front of the finish surface of the compression unit housing 51, the fixed scroll wrap 60 is curved in a spiral form to match the scroll wrap 59 of the revolving scroll 53 Arranged to converge towards the center. Accordingly, when the swing scroll 53 rotates, the coincident swing scroll 53 and the fixed scroll 55 pivot from the drive unit 3 by the interaction of the swing and fixed scroll wraps 59 and 60, respectively. And the refrigerant sucked into the outer edges of the fixed scroll wraps (59, 60) to the center portion thereof, and then discharged to the rear head (57) through a discharge hole penetrated through the center of the finish surface under high pressure.

On the other hand, the control unit 7 is a part for controlling the operation of the drive unit 3, as shown in Figure 3 is electrically connected to the stator 35 of the drive unit 3 to the external power supplied through the connection end The rotor 40 is rotated to be driven or stopped by removing the stator 35.

Now, the operation of the motor-driven compressor 1 according to the present invention configured as described above is as follows.

In order to compress the refrigerant by the motor-driven compressor 1 of the present invention, an external power source is first applied to the control unit 7 through the connection end, and the control unit 7 again drives the drive unit 3 through various drive circuits and elements. The winding coil 33 of the stator 35 is fed, whereby the stator 35 is excited.

When the stator 35 of the drive unit 3 is excited, the rotor 40 moves the rotary shaft 37 inside the stator 35 by the interaction of the stator 35 and the rotor 40 according to the motor driving principle. High speed rotation about the center.

Accordingly, the turning scroll 53 coupled to the eccentric shaft 41 at the rear end of the rotating shaft 37 also revolves around the inner circumferential surface of the fixed scroll 55 about the rotating shaft 37, and has a spiral scroll ( 53, the scroll wrap 59 of the interaction interacts with the scroll wrap 60 of the fixed scroll 55, the compression and rotation around the refrigerant of the outer periphery of the swing and fixed scroll wrap (59, 60) to the rear head (57) By discharging at high pressure through the compressor, a series of refrigerant compression operations by the compressor 1 are completed.

By the way, according to the electric compressor 1 of the present invention, as shown in Figures 4 to 6, the fixing means 65, that is, the rivet weight balance 43-1, 43-2 to the rotor core housing In the state of fastening to 61, a part of the head 71 blocks one end of the permanent magnet 63 inserted into the rotor core housing 61, and therefore the weight balance 43-1, 43- on the opposite side thereof. The permanent magnet 63, the other end of which is blocked by 2), is restrained from moving in the axial direction in the rotor core housing 61.

Further, as shown in Figs. 7 and 8, the fixing means 65 has the head 71 when one side of the head 71 is angled at 90 degrees and extends to the opposite side of the permanent magnet 63. It is possible to more stably restrain the permanent magnet 63 by.

At this time, the fixing means 65 is permanent, by attaching or inserting the magnetic void portion 77 to the portion of the head 71 in contact with the permanent magnet 63 during assembly, as shown in FIGS. Since the magnetic flux of the magnet 63 can be prevented from leaking through the head 71, the contact area of the permanent magnet 63 of the head 71 can be further increased without fear of magnetic flux leakage, and thus the permanent magnet 63 It is possible to further increase the binding force of the fixing means (65) for.

1: electric compressor 3: drive unit
5 compression unit 7 control unit
31 drive unit housing 33 coil
35: stator 37: axis of rotation
39: rotor core 40: rotor
41: eccentric shaft 43-1, 43-2: weight balance
53: Slewing Scroll 55: Fixed Scroll
61 core housing 63 permanent magnet
65: fixing means 71: head
73: body 75: one side
77: magnetic void

Claims

The rotor 35 is fixed to the inner circumferential surface of the drive housing 31 and is rotatably axially supported by the drive housing 31 in the stator 35 in which the coil 33 is wound so as to form a through hole along the axis. A driving unit 3 for generating a rotational driving force by the interaction of the electrons 40;
Compression action of the swinging scroll 53 coupled to one end of the driving unit 3 and synchronously rotating by the rotational driving force generated by the driving unit 3 and the fixed scroll 55 formed to correspond to the turning scroll 53. Compression unit (5) for compressing the refrigerant introduced from the drive unit housing 31 by; And
And a control unit 7 electrically connected to the stator 35 of the driving unit 3 to control the operation of the driving unit 3.
The rotor 40,
A rotation axis 37 arranged along the central axis;
A rotor core 39 attached to an outer circumferential surface of the rotation shaft 37 to generate magnetic flux;
An eccentric shaft (41) which protrudes at one end of the rotary shaft (37) to cause the compression action by revolving the pivoting scroll (53) with respect to the rotary shaft (37); And
Weight balances 43-1 and 43-2 attached to both ends of the rotor core 39 to offset fluctuations generated in the rotation shaft 37 due to the eccentric shaft 41,
The rotor core 39 is a fixing means for fixing the weight balance (43-1, 43-2) and the weight balance (43-1, 43-2) to the rotor core housing (61) And a permanent magnet (63) inserted into the rotor core (39).

The method according to claim 1,
The rotor core 39,
A hollow cylindrical rotor core housing 61 in which a through hole 62 for inserting the rotation shaft 37 is formed along an axis;
A plurality of permanent magnets (63) arranged and inserted at right angles to a radially outer portion of the rotor core housing (61); And
At one end, the weight balance 43-1, 43-2 is fixed to the rotor core housing 61, and at the other end, the permanent magnet having one end blocked by the weight balance 43-1, 43-2. And a fixing means (65) for blocking the other end of the (63) to axially restrain the permanent magnet (63) in the rotor core housing (61).

The method of claim 2,
The fixing means 65 is inserted into the rotor core housing 61 on the opposite side of either of the weight balances 43-1 and 43-2 so that either weight balance 43-1 or 43- is fixed. 2) The motor-compressor, characterized in that the head 71 is a rivet which restrains the permanent magnet 63 in the axial direction when fixing the 2).

The method of claim 3,
The fastening means 65 includes the head for restraining the permanent magnet 63 in the axial direction when the one of the weight balances 43-1 and 43-2 is fixed to the rotor core housing 61. The one side of the 71 is extended to the opposite side of the permanent magnet (63).

5. The method of claim 4,
The fixing means (65) is a motor-compressor, characterized in that the portion in contact with the permanent magnet (63) of the head (71) is formed of a magnetic void portion (77) of a nonmagnetic material.