JP2003219616A - Electric compressor, electric motor therefor and method of adjusting its rotor balance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric motor for an electric compressor, which can do away with balance weight parts from a rotor by making an electromagnetic steel plate have a balance weight function and can get off with the possible fewest kinds of electromagnetic steel sheets, a method of adjusting its rotor balance, and the electric compressor. <P>SOLUTION: For the rotor 36 of the electric motor for the electric compressor, the iron core is constituted by stacking plural sheets of electromagnetic steel 37. A hole 39 for balance adjustment is made in the electromagnetic steel sheets 37. The plural sheets of electromagnetic steel 37 are stacked in two kinds of ways of arrangement where the holes 37 are slid by 180° in circumferential direction. Consequently, in the cross section passing the axis of the rotor 36, vacant spaces S made by the holes 39 confront each other in diagonal direction across an axis, and weight function parts W are made in sections opposed to the vacant spaces S across the axis of the rotor 36. The holes 39 are in the same form as an insertion hole for a rivet 40. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, in an electric compressor that constitutes a refrigerating cycle of a vehicle air conditioner and compresses a refrigerant gas, and includes a rotor having an iron core formed by laminating electromagnetic steel sheets. The present invention relates to an electric motor for an electric compressor, a rotor balance adjusting method for the electric motor, and an electric compressor.

[0002]

2. Description of the Related Art Conventionally, as a rotor of an electric motor for an electric compressor of this type, there are those shown in FIGS. The main body of the rotor 100 is formed by stacking electromagnetic steel plates 101. Laminated electromagnetic steel sheets 1
In 01, six arc-shaped ferrite magnets 102 are inserted. Both end faces of the laminated electromagnetic steel plates are sandwiched by end plates 103, and fitted and fixed by six rivets 104. A balance weight 105 is attached to the outside of the end plate 103 of the rotor 100 by a rivet 104 in order to cancel the eccentricity of the scroll.

As a rotor of an electric motor without a balance weight, for example, an electric motor rotor described in Japanese Patent Laid-Open No. 6-14505 is known. The electromagnetic steel sheets that are laminated to form the rotor have separate holes for balance correction and holes for clamp pins.

[0004]

However, in the technique of FIGS. 6 and 7, the weight of the rotor is increased and the total length is extended by the amount of the balance weight 105 attached. In addition, the rivet 104 has a balance weight 1
The length varies depending on whether or not 05 is sandwiched. As a result, two types of rivets 104 having different lengths are required, and the number of parts increases.
Further, the use of the balance weight 105 itself also leads to an increase in the number of parts, which causes a problem of cost increase.

Further, in the rotor described in Japanese Patent Laid-Open No. 6-14505, an electromagnetic steel sheet having a balance correction hole for constructing the rotor and an electromagnetic steel sheet having no balance correction hole are laminated. . That is, two types of electromagnetic steel sheets are required, which increases the number of parts. Also,
Since the balance correction hole and the hole for the clamp pin are different in size, there is also a problem that it takes time and labor for machining a die for punching and for punching an electromagnetic steel sheet.

An object of the present invention is to eliminate the balance weight component from the rotor by providing the electromagnetic steel sheet with a balance weight function, and to reduce the number of types of electromagnetic steel sheet required as much as possible. An adjustment method and an electric compressor are provided.

[0007]

In order to achieve the above object, therefore, in the invention according to claim 1, the rotor core of the electric motor for an electric compressor has a plurality of electromagnetic steel sheets laminated in the axial direction. It is composed by. The electromagnetic steel sheet has a hole or a recess for balance adjustment for adjusting the rotational balance of the rotor. The rotor is balance-adjusted by stacking the electromagnetic steel plates in the axial direction by shifting the positions of the holes or the recesses for balance adjustment in the circumferential direction. As a result, the balance weight can be eliminated and the number of parts can be reduced. Further, since the electromagnetic steel plates are laminated while being shifted in the circumferential direction, it is possible to reduce the types of electromagnetic steel plates required for balance adjustment.

According to a second aspect of the present invention, in the first aspect of the invention, the electromagnetic steel sheets are laminated with the balance adjustment holes or recesses being displaced by approximately 180 degrees in the circumferential direction. According to the present invention, the rotors are balanced by stacking the electromagnetic steel plates with the positions of the holes or the recesses for balance adjustment being shifted by approximately 180 degrees in the circumferential direction.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the electromagnetic steel sheet has at least one pair of balance adjusting holes or recesses at positions facing each other with the center interposed therebetween. The hole or recess and the other hole or recess differ in size from each other. According to the present invention, the rotor can be balance-adjusted by at least a pair of holes or recesses for balance adjustment having different sizes provided at positions facing each other with the center of the electromagnetic steel plate sandwiched therebetween.

The invention according to claim 4 is the invention according to claim 1 or 2.
In the invention described in (1), the hole or recess for adjusting the balance is provided only at one of the positions facing each other with the center of the electromagnetic steel plate interposed therebetween. According to the present invention, the rotor can be balance-adjusted by the balance-adjusting hole or recess provided only at one of the opposing positions with the center of the electromagnetic steel plate sandwiched therebetween.

According to a fifth aspect of the invention, in the fourth aspect of the invention, only one hole or recess is provided for balance adjustment. According to the present invention, only one hole or recess is provided for balance adjustment, and extra processing is not required as compared with the case where there are a plurality of holes or recesses.

According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, a hole is formed in the magnetic steel sheet for balance adjustment. According to this invention, the balance can be adjusted by the holes.

According to a seventh aspect of the present invention, in the invention according to any one of the first to sixth aspects, the holes for balance adjustment are electromagnetic in order to insert fixed shaft members for laminating and fixing the electromagnetic steel plates. It has the same shape as the insertion hole provided in the steel plate. According to this invention, since the hole for balance adjustment and the insertion hole for inserting the fixed shaft member have the same shape, for example, the processing for forming the hole can be performed in the same step, and the electromagnetic steel sheet is manufactured. This facilitates design or processing.

According to an eighth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the rotor is formed by laminating only one type of the electromagnetic steel plates. According to the present invention, since only one type of electromagnetic steel plate is required to form the rotor, the number of parts can be reduced.

According to a ninth aspect of the present invention, in the invention according to any one of the first to eighth aspects, a void portion formed by the hole or the concave portion in the rotor by laminating the electromagnetic steel sheets. Alternatively, the groove portions face each other in a diagonal direction sandwiching the axis line in a cross section passing through the axis line of the rotor. According to this invention, in addition to the effect of the invention described in any one of claims 1 to 8, a cross section in which the void or groove formed in the rotor by the hole or recess for balance adjustment passes through the axis of the rotor. In, the rotor can be balanced by laminating electromagnetic steel sheets so as to face each other diagonally with the axis interposed therebetween.

The invention as defined in claim 10 is defined by claim 1 through claim 9.
In the invention according to any one of claims 1 to 3, magnets having a plurality of poles are provided in the iron core at equal angular intervals in a circumferential direction, and the holes or recesses for balance adjustment are arranged on an outer peripheral side of the magnet in the iron core. What is done is the summary.

According to the present invention, in addition to the operation of the invention described in any one of claims 1 to 9, the balance adjusting hole or recess is located outside the magnet in the iron core (that is, the electromagnetic steel plate). Therefore, if the holes or recesses have the same size, the larger the moment, the greater the moment is obtained by the weight portion, which is the portion having no void. Therefore, the effect of balance adjustment is great.

The invention described in claim 11 is defined by claims 1 to 1.
The gist is that the electric motor according to any one of 0 is used for an electric scroll compressor. According to the present invention, since the electric motor is used in the electric scroll compressor, the unbalance due to the eccentricity of the compression mechanism with respect to the rotating shaft of the electric scroll compressor can be balanced by the rotor.

A twelfth aspect of the present invention is summarized as an electric compressor including the electric motor according to any one of the first to tenth aspects. Therefore, according to this electric compressor, the same operational effects as those of the invention according to any one of claims 1 to 10 can be obtained.

According to a thirteenth aspect of the present invention, the electric scroll compressor includes the electric motor according to the twelfth aspect. Therefore, the same effect as that of the invention described in claim 12 is obtained, and in particular, the unbalance due to the eccentricity of the compression mechanism with respect to the rotary shaft of the electric scroll compressor can be adjusted by the rotor.

The invention according to claim 14 relates to a rotor balance adjusting method for an electric motor for an electric compressor, which comprises a rotor having an iron core formed by laminating a plurality of electromagnetic steel sheets in an axial direction. A balance adjusting hole or a recess for adjusting the rotational balance of the rotor is formed in the electromagnetic steel plate, and the electromagnetic steel plates are laminated by shifting the position of the balance adjusting hole or the recess in the circumferential direction. Thereby, the balance of the rotor can be adjusted.

A fifteenth aspect of the present invention relates to a rotor balance adjusting method for an electric motor for an electric compressor according to the fifteenth aspect. The electric motor is used in an electric compressor in which a compression mechanism is eccentrically provided with respect to a rotating shaft that rotates together with a rotor. One type of electromagnetic steel sheet having a hole or a recess for balance adjustment is laminated by shifting the position of the hole or recess for balance adjustment by approximately 180 degrees in the circumferential direction. This allows the rotor to be balanced in a diagonal direction in a cross section passing through its axis.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is embodied in an electric scroll compressor used in a vehicle air conditioner will be described below.

As shown in FIG. 1, a housing 11 of an electric scroll compressor 10 as an electric compressor.
Is configured by joining and fixing two of the first housing constituent body 21 and the second housing constituent body 22. First
The housing structure 21 has a bottomed cylindrical shape having a bottom 24 on the left side of the cylindrical portion 23 in the drawing, and the second housing structure 22 has a closed cylinder having a lid 26 on the right side of the cylindrical portion 25 in the drawing. I am in a shape. The first housing component 21 and the second housing component 22 are fastened and fixed by inserting bolts 29 into the mounting portions 27 and 28. A gasket 30 is interposed on the joint surface between the first housing structure 21 and the second housing structure 22.

As shown in FIG. 1, the bottom portion 24 of the first housing structure 21 is integrally provided with a cylindrical shaft support portion 24a at the center of its inner wall surface. On the other hand, a shaft support member 31 is fitted in the cylindrical portion 23 of the first housing structure 21, and an insertion hole 31 a is formed through the center portion of the shaft support member 31.

The rotary shaft 3 is provided in the first housing structure 21.
2 are housed. The left end side of the rotating shaft 32 is the shaft support 2
It is rotatably supported by way of a radial bearing 33 fitted in 4a. The right end side of the rotating shaft 32 is rotatably supported by way of a radial bearing 34 fitted in an insertion hole 31 a of the shaft support member 31.

A stator 35 is arranged on the bottom 24 side in the first housing structure 21. Stator 35
Consists of a cylindrical iron core 35a and a winding 35b wound around the iron core 35a. The rotor 36 disposed on the inner peripheral side of the stator 35 is externally fitted and fixed to the rotating shaft 32 while being prevented from rotating integrally. The stator 35 and the rotor 36 constitute the electric motor 13 which is a brushless DC motor as an electric motor. The rotor 36 has an iron core 36 a configured by laminating a plurality of electromagnetic steel plates 37 described below, and a 6-pole magnet 38.

(Rotor of Electric Motor) FIG. 2 shows an electromagnetic steel plate 37 constituting a rotor 36 of an electric motor using a 6-pole magnet. A guide hole 32a for the rotary shaft 32 of the motor is provided in the center of the electromagnetic steel plate 37. In addition, a bow-shaped hole 38a is provided so that the bow-shaped ferrite magnet 38 can be inserted.
Are provided at six locations on the same circumference at equal intervals. Out of the six arcuate holes 38a, five holes on the outer peripheral side are provided with one balance adjustment hole 39 and four insertion holes 40a for inserting the rivets 40 as fixed shaft members. No insertion hole 40a is located at a position opposed to the balance adjusting hole 39 with the guide hole 32a interposed therebetween. That is, the balance adjustment hole 39 is the guide hole 32.
It is formed only at one of the two locations that are located opposite to each other with a in between. All of the four insertion holes 40a face each other with the guide hole 32a interposed therebetween. The four insertion holes 40a are formed so that they can be aligned with each other when the electromagnetic steel plates 37 are arranged 180 degrees apart in the circumferential direction.

Here, the balance adjusting hole 39 and the insertion hole 40a have the same shape. That is, six arcuate holes 38
5 holes of the same shape for a (balance adjustment holes 3
9 and an insertion hole 40a) are provided.

As shown in FIG. 3, the rotor 3 of the electric motor
6 is an iron core 36a formed by laminating a plurality of electromagnetic steel plates 37
6 arcuate ferrite magnets 38 are inserted and arranged in, and four rivets 40 are inserted and fixed such that the iron core 36a is sandwiched by the end plates 36b from both end surfaces.

As shown in FIG. 3, in the cross section passing through the axis of the rotor 36, the two voids S formed by the balance adjusting holes 39 are diagonally opposed to each other with the axis of the rotor 36 interposed therebetween. The electromagnetic steel plates 37 are laminated.
That is, in a region (a region on the right side in the figure) on one side of both sides sandwiching the substantially central position in the axial direction of the rotor 36, a plurality of electromagnetic steel plates 37 are laminated in a direction in which the holes 39 are arranged on the upper side in the diagram, In the area of approximately half on one side (left side area in the figure),
The plurality of electromagnetic steel plates 37 are laminated so that the holes 39 are arranged on the lower side in the figure. Two holes S are formed in the rotor 36 by communicating holes 39 in the axial direction, and these two spaces S are opposed to each other across the axis in a cross section (FIG. 3) passing through the axis of the rotor 36. They are located so as to face each other in the angular direction. Each space S is sandwiched by the axis of the rotor 36.
A weight portion W having a relatively high specific gravity is formed in a portion facing the. The weight portion W substitutes for the balance weight 105 used in the conventional technique.

Further, since the angle by which the electromagnetic steel plate 37 is displaced in the circumferential direction is 180 degrees, even if the direction of the electromagnetic steel plate 37 is changed, the four insertion holes 40a and the six arcuate holes 38a are connected to one each. There is. Therefore, as shown in FIGS. 3 and 4, the four rivets 4 are inserted into the insertion hole 40a and the arcuate hole 38a of the iron core 36a formed by laminating the electromagnetic steel plates 37.
Zero and six ferrite magnets 38 can be inserted and arranged respectively.

(Compression Mechanism of Electric Compressor) As shown in FIG. 1, as the compression mechanism 14 of the electric compressor,
The scroll type is used. That is,
A fixed scroll member 41 sandwiched between the shaft support member 31 and the gasket 30 is arranged on the opening end side of the cylindrical portion 23 in the first housing structure 21.

The fixed scroll member 4 on the rotary shaft 32
An eccentric shaft 43 is provided on the end face on the first side at a position eccentric to the axis of the rotary shaft 32. A bush 44 is externally fitted and fixed to the eccentric shaft 43. A movable scroll member 45 is supported by the bush 44 so as to face the fixed scroll member 41 via a bearing 46 so as to be relatively rotatable. The movable scroll member 45 includes a disk-shaped substrate 45a and a movable scroll wall 45b provided upright toward the fixed scroll member 41.

The fixed scroll member 41 and the movable scroll member 45 are meshed with each other by spiral walls 41c and 45b, and the tip surfaces of the spiral walls 41c and 45b are the base plates of the scroll members 41 and 45 of the counterpart. 41
It is joined to a and 45a. Therefore, the substrate 41a and the fixed scroll wall 41c of the fixed scroll member 41, the substrate 45a and the movable scroll wall 45b of the movable scroll member 45,
The compression chamber 47 is sectioned and formed.

Between the base plate 45a of the movable scroll member 45 and the shaft support member 31 facing the base plate 45a, a rotation preventing mechanism 48 by a pin 48a is arranged. A suction chamber 49 is defined between the outer peripheral wall of the fixed scroll member 41 and the outermost peripheral portion of the movable scroll wall 45b of the movable scroll member 45. The suction chamber 49 is connected to an external refrigerant circuit (not shown) via a suction passage 51.

A part of the closed space 12 is formed by joining the second housing structure 22 and the fixed scroll member 41.
It is partitioned as a discharge chamber 52. The discharge chamber 52 is connected to an external refrigerant circuit (not shown) via a discharge passage 54. The discharge hole 41 is formed at the center of the fixed scroll member 41.
e, the discharge valve 55 that opens and closes the discharge hole 41e, and the discharge valve 5
A retainer 56 that regulates the opening degree of 5 is formed. The compression chamber 47 on the center side and the discharge chamber 52 communicate with each other through the discharge hole 41e.

The rotary shaft 3 is driven by the electric motor 13.
When 2 is rotationally driven, in the compression mechanism 14, the movable scroll member 45 is revolved around the axial center of the fixed scroll member 41 via the eccentric shaft 43. At this time, the movable scroll member 45 is prevented from rotating by the rotation preventing mechanism 48, and only the revolution movement is permitted. By the orbital motion of the movable scroll member 45, the compression chamber 47 is moved from the outer peripheral side of the scroll walls 41c, 45b of the scroll members 41, 45 to the center side while reducing the volume thereof, and thus the suction chamber 49 is compressed. The refrigerant gas taken into 47 is compressed. The compressed refrigerant gas is discharged from the discharge hole 41e into the discharge chamber 52 via the discharge valve 55, and then is discharged to the external refrigerant circuit via the discharge passage 54.

According to this embodiment, the following effects can be obtained. (1) A balance adjustment hole 39 is provided in the electromagnetic steel plate 37, and the electromagnetic steel plates 37 are laminated in the two regions bisected at a substantially central position in the axial direction of the rotor 36 while being shifted by 180 degrees in the circumferential direction. The distribution of the voids S formed in the iron core 36a was adjusted by the adjustment holes 39 to balance the rotor 36. Therefore, the balance adjustment of the rotor 36 necessary to balance the eccentricity of the compression mechanism 14 is performed by the electromagnetic steel plate 37 that is an essential component of the rotor 36.
It can be performed using the shape of. Therefore, it is possible to eliminate the balance weight, which has been conventionally required for balancing. Therefore, the total length of the rotor 36 can be made compact, and one type of rivet 4 can be used.
The electromagnetic steel plate 37 can be fixed at 0. From the above, the number of parts can be reduced.

(2) The electromagnetic steel sheets 37 are laminated so that the two voids S formed by the balance adjusting holes 39 face each other diagonally in a cross section passing through the axis of the rotor 36. Therefore, it is decided to balance the rotation of the rotor 36. As a result, the electromagnetic steel plate 37 is
Only one kind of mold is required for processing.

(3) Since the balance adjusting hole 39 is formed in the electromagnetic steel plate 37 at a position on the outer peripheral side of the arcuate hole 38a into which the magnet 38 is inserted, weighting can be applied at a position near the outer peripheral of the rotor 36. Is. Therefore, the hole 39
A large moment is obtained for the rotor 36 for the size of the (gap), and even if the eccentricity of the scroll compression mechanism with respect to the rotating shaft 32 is large, it is possible to sufficiently cope with the balance adjustment.

(4) The balance adjustment hole 39 and the insertion hole 40a have the same shape. This can reduce the number of processing steps. Further, it becomes possible to use four rivets 40, which was required to be six, and the number of parts can be reduced.

(5) Since the iron core 36a is formed by using only the electromagnetic steel plate 37 having the holes 39 for balance adjustment, the voids S are distributed over the entire area of the iron core 36a in the axial direction of the rotor 36. The weight can be reduced.

(6) The electromagnetic steel plate 37 is provided with the holes 39 for adjusting the balance to balance the eccentricity generated during scrolling. Even if the model of the electric compressor is different, the same electromagnetic steel plate 37 is used and the electromagnetic steel plate 3 is used.
Since it is only necessary to make the stacked thicknesses of 7 different, it is possible to unify the parts of the electromagnetic steel plate 37 among the models.

The embodiment can be modified and implemented in the following different forms. In the above embodiment, only one type of electromagnetic steel sheet is used, but two or more types of electromagnetic steel sheet may be used. For example, the iron core 36a may be configured by combining an electromagnetic steel sheet having a hole for balance adjustment and an electromagnetic steel sheet having no hole for balance adjustment. In this case as well, the number of parts of the electromagnetic steel plates can be reduced by shifting the arrangement position of the electromagnetic steel plates having the holes for balance adjustment in the circumferential direction and stacking them.

In the above-described embodiment, the hole is formed for balance adjustment, but a recess for balance adjustment may be used. For example, as shown in FIG. 5, a recess 61 may be provided in a part of the electromagnetic steel plate 37, the electromagnetic steel plates 37 may be stacked, and balance adjustment may be performed by the recess 61 for balance adjustment. In this case, the recess 61 forms a groove-like void on the outer peripheral surface of the iron core 36a.

In the above embodiment, the hole 39 for balance adjustment is provided only at one of the two positions facing each other with the center of the electromagnetic steel plate 37 interposed between them. Alternatively, a pair of holes for balance adjustment may be provided. For example, as shown in FIG.
A hole 39 and a hole 62 for balance adjustment having different sizes are formed at two positions facing each other with the center of 7 interposed therebetween. Since the sizes of the two holes 39 and 62 are different, balance adjustment can be performed. Instead of the holes 39 and 62 for balance adjustment, a pair of recesses having different recesses (opening areas) may be used.

In the above-described embodiment, a 6-pole magnet is used, but it can be achieved by using an even-pole magnet having 4 or more poles. For example, FIG. 7 shows an electromagnetic steel plate 63 in the case of using a 4-pole flat magnet. In this case, the balance adjustment hole 64
Was arranged on the inner peripheral side with respect to the insertion hole 65. In addition,
The hole 64 for balance adjustment may be arranged at another position. For example, the outside of the hole 66 for the flat plate magnet or the insertion hole 6
It may be arranged on the outside of 5.

○ The above-described embodiment (FIG. 2, etc.), FIGS.
In the above, the position where the hole or recess for adjusting the balance is provided in the electromagnetic steel plate 37 is not limited to the arc center position of the arcuate hole 38a (that is, the magnet 38). For example, a hole or a recess for balance adjustment is provided from the center position of the arc of the arcuate hole 38a to the electromagnetic steel plate 3
It can be provided at a position deviated in the circumferential direction of 7.

In the above-described embodiment, the orientation of the electromagnetic steel plate 37 is changed at the axial center of the rotor 36, but the orientation may be changed at another position. That is, the electromagnetic steel plate 37
The direction of stacking may be changed at a place having a predetermined stacking thickness for adjusting the balance when stacking.

In the above embodiment, the magnet used for the electric motor was the arcuate ferrite magnet 38, but a rare earth magnet may be used. Further, the shape of the magnet is not limited to the bow shape, and may be, for example, a flat plate shape.

The balance adjusting hole may be a balance adjusting hole by providing two holes of the same size at positions facing each other with the center of the electromagnetic steel plate sandwiched therebetween, and varying the eccentric distance from the center. it can.

The fixed shaft member for sandwiching and fixing the laminated body of the electromagnetic steel plates 37 is not limited to the rivet 40. Magnetic steel sheet 3
The laminated body of 7 may be clamped and fixed by bolts. Further, the method of fixing the laminated body of the electromagnetic steel plates 37 is not limited to the configuration using the fixed shaft member. For example, electromagnetic steel plates may be joined and fixed with an adhesive.

The angle by which the electromagnetic steel sheets are shifted in the circumferential direction during lamination is not limited to 180 degrees. As long as the imbalance due to the eccentricity of the compression mechanism 14 of the electric compressor can be effectively balanced, the way of disposing the electromagnetic steel plates in the circumferential direction is not limited to two types. For example, the electromagnetic steel plates may be stacked in three different arrangements, which are shifted by 120 degrees in the circumferential direction.

2 and 6, the holes 40a and 39 of the electromagnetic steel plate 37 may be displaced from the center of the arc of the arcuate hole (magnet hole) 38a. In the above embodiment, the inner rotor is used, but the outer rotor may be used.

The electric compressor to which the electric motor is applied is not limited to the electric scroll compressor 10. The present invention can be widely applied to electric compressors that require unbalanced balance adjustment of the eccentricity of the compression mechanism with respect to the rotating shaft. Furthermore, the compression mechanism is not limited to the electric compressor having a structure that is eccentric with respect to the rotating shaft,
The present invention can be widely applied to electric compressors that require any balance adjustment, such as load unbalance and unbalance due to parts other than the compression mechanism assembled to the rotary shaft.

Next, technical ideas other than the invention described in the claims that can be grasped from the above-described embodiments will be described below together with their effects. (1) In any one of claims 1 to 3, at least a pair of the holes or recesses for balance adjustment are provided at a position facing each other with the center of the electromagnetic steel plate sandwiched therebetween and at different distances from the center. It is characterized by being Even with such electromagnetic steel sheets, the rotors can be balanced by stacking them while shifting them in the circumferential direction.

(2) In claim 1 or 2, at least one hole or recess for adjusting the balance is provided so as to be eccentrically located on the same side with respect to the center of the electromagnetic steel sheet. To do. Even with such electromagnetic steel sheets, the rotors can be balanced by stacking them while shifting them in the circumferential direction.

(3) In claim 3, "different sizes from each other" means that the total opening area of one hole or recess located opposite to each other with the center of the electromagnetic steel plate in between is different from that of the other hole or recess. It means that the total opening area is different. Therefore, the one hole or the concave portion and the other hole or the concave portion that are opposed to each other with the center of the electromagnetic steel plate sandwiched therebetween include the case where one or both of them have a plurality of holes or concave portions.

(4) In any one of claims 1 to 11, a plurality of insertion holes for a fixed shaft member to be inserted into the iron core are formed in the electromagnetic steel plate, and the electromagnetic steel plate is used for the insertion. The gist is that the holes are laminated so as to be shifted in the circumferential direction so that the holes communicate with each other. Even if the electromagnetic steel plates are shifted in the circumferential direction and stacked, the insertion holes communicate with each other, so that the fixed shaft member can be inserted into the iron core.

(5) In any one of claims 1 to 11, the voids or recesses formed in the iron core by the balance adjusting holes or recesses are uniformly distributed in the axial direction of the rotor. That is the summary. With this configuration, the weight of the rotor can be reduced.

(6) In any one of claims 1 to 11, insertion holes of the fixed shaft member inserted into the iron core are formed in the electromagnetic steel plate in the same number as the number of poles of the magnet on the same circumference. Two or more pairs (four) arranged so as to face each other with the center of the electromagnetic steel plate sandwiched between positions at equal angular intervals, and at least one hole for balance adjustment provided Is the gist.

(7) In any one of claims 2 to 11, a plurality of insertion holes for a fixed shaft member to be inserted into the iron core are formed in the electromagnetic steel plate, and the plurality of insertion holes are formed. The electromagnetic steel plates are formed so that they can all coincide when they are arranged 180 degrees apart in the rotational direction.

(8) In any one of claims 1 to 11, the electric compressor using the electric motor includes a rotating shaft that rotates together with the rotor and a compression mechanism that is driven by the rotation of the rotating shaft. The point is to have it.

(9) In any one of claims 2 to 11, the electric compressor using the electric motor includes a rotary shaft that rotates together with the rotor, and a compression mechanism driven by the rotation of the rotary shaft. The gist is that the compression mechanism is eccentric with respect to the rotating shaft.

(10) The electric motor for an electric compressor according to claim 11 is characterized in that the electric scroll compressor is for a vehicle. With this configuration, even if the compression mechanism of the electric scroll compressor for a vehicle is eccentric with respect to the rotating shaft, the unbalance of the rotor due to the eccentricity can be adjusted in balance.

(11) In the fourteenth aspect, the electric motor is used in an electric compressor in which a compression mechanism is eccentrically provided with respect to a rotating shaft rotating with the rotor, and the electromagnetic steel plate is used for the balance adjusting hole. Alternatively, the gist is to balance the rotor in a diagonal direction in a cross section passing through the axis of the rotor by stacking the recesses with the positions displaced by approximately 180 degrees in the circumferential direction.

(12) In claim 15, the electric compressor is an electric scroll compressor. According to this, balance adjustment can be performed in a diagonal direction in a cross section passing through the axis of the rotor.

[0069]

As described above in detail, according to the present invention, the electromagnetic steel sheets are provided with a balance weight function by stacking them by shifting the positions of the holes or recesses for balance adjustment in the circumferential direction. Therefore, balance weight parts can be eliminated from the rotor, and the number of types of electromagnetic steel sheets can be reduced as much as possible.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an electric compressor according to an embodiment.

FIG. 2 is a plan view of an electromagnetic steel plate.

FIG. 3 is a vertical sectional view of a rotor of an electric motor.

FIG. 4 is a front view of a rotor of an electric motor.

FIG. 5 is a plan view of a magnetic steel sheet of another example.

FIG. 6 is a plan view of an electromagnetic steel sheet of another example different from FIG.

FIG. 7 is a plan view of a magnetic steel sheet of another example different from FIG.

FIG. 8 is a vertical cross-sectional view of a rotor of a conventional electric motor.

FIG. 9 is a front view of a rotor of the electric motor of the same.

[Explanation of symbols]

10 ... Electric scroll compressor as electric compressor, 13 ... Electric motor, 14 ... Compression mechanism, 32 ... Rotating shaft, 35a, 36a ... Iron core, 36 ... Rotor, 37, 6
3 ... Electromagnetic steel plate, 38 ... Magnet, 39 ... Balance adjustment hole, 40a ... Insertion hole, S ... Void portion, W ... Weight function part, 61 ... Balance adjustment recess, 62 ... Balance adjustment hole, 64 ... Balance adjustment hole, 65 ... Insertion hole

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02K 1/27 501 H02K 1/27 501K 5H622 501L 1/30 1/30 A 7/14 7/14 B (72) Invention Ken Mizuto 2-chome Toyota-cho, Kariya-shi, Aichi Stock company Toyota Automatic Loom (72) Inventor Kazuya Kimura 2-chome Toyota-cho, Kariya city Aichi F-term inside Toyota Industries (reference) 3H029 AA02 AA15 AB03 BB24 CC07 CC27 CC58 3H039 AA02 AA04 CC11 CC32.

Claims (15)

[Claims] 1. An electric motor for an electric compressor including a rotor having an iron core formed by stacking a plurality of electromagnetic steel plates in an axial direction, wherein the electromagnetic steel plate is for balance adjustment for adjusting a rotational balance of the rotor. The electric motor for an electric compressor is characterized in that the rotor is adjusted in balance by stacking the electromagnetic steel plates by shifting the arrangement positions of the holes or the recesses in the circumferential direction. 2. The electric motor for an electric compressor according to claim 1, wherein the electromagnetic steel plates are laminated by arranging the positions of the holes or the recesses for balance adjustment so as to be shifted by about 180 degrees in the circumferential direction. 3. The electromagnetic steel sheet has at least one pair of the holes or recesses for balance adjustment at positions facing each other with the center interposed, and one hole or recess and the other hole or recess have different sizes from each other. An electric motor for an electric compressor according to claim 1 or 2. 4. The electric compressor according to claim 1, wherein the balance adjusting hole or recess is provided only at one of positions facing each other with the center of the electromagnetic steel plate interposed therebetween. Electric motor. 5. The electric motor for an electric compressor according to claim 4, wherein the electromagnetic steel plate is provided with only one hole or recess for adjusting the balance. 6. The electric motor for an electric compressor according to claim 1, wherein a hole is formed in the electromagnetic steel plate for balance adjustment. 7. The balance adjusting hole has the same shape as an insertion hole provided in the electromagnetic steel plate for inserting a fixed shaft member for stacking and fixing the electromagnetic steel plates. An electric motor for an electric compressor according to any one of 1 to 6. 8. The electric motor for an electric compressor according to claim 1, wherein the rotor is configured by laminating only one type of the electromagnetic steel plates. 9. The voids or grooves formed in the rotor by the holes or the recesses by stacking the electromagnetic steel sheets face each other in a diagonal direction sandwiching the axis in a cross section passing through the axis of the rotor. The electric motor for an electric compressor according to claim 1, wherein the electric motor is for an electric compressor. 10. The iron core is provided with magnets having a plurality of poles at equal angular intervals in the circumferential direction, and the balance adjusting holes or recesses are arranged on the outer peripheral side of the magnet in the iron core. The electric motor for an electric compressor according to any one of claims 1 to 9. 11. The electric motor for an electric compressor according to claim 1, which is used in an electric scroll compressor. 12. An electric compressor comprising the electric motor according to claim 1. 13. The electric compressor according to claim 12, wherein the electric compressor is an electric scroll compressor. 14. A method for adjusting a rotor balance of an electric motor for an electric compressor, which comprises a rotor having an iron core configured by laminating a plurality of electromagnetic steel plates in an axial direction, wherein a rotational balance of the rotor is adjusted on the electromagnetic steel plates. For adjusting balance of the rotor by forming holes or recesses for balance adjustment for stacking, and stacking the electromagnetic steel plates by shifting the positions of the holes or recesses for balance adjustment in the circumferential direction. Balance adjustment method for electric motors for automobiles. 15. The method of adjusting a rotor balance of an electric motor for an electric compressor according to claim 14, wherein the electric motor is used in an electric compressor in which a compression mechanism is eccentrically provided with respect to a rotation shaft that rotates together with the rotor. The rotor passes through its axis by stacking one type of electromagnetic steel sheet having the balance adjusting hole or recess formed therein by shifting the position of the balance adjusting hole or recess by about 180 degrees in the circumferential direction. A method of adjusting a rotor balance of an electric motor for an electric compressor, comprising adjusting balance in a diagonal direction in a cross section.