JP2001128395A - Rotating electric machine, compressor and method for manufacturing rotating electric machine - Google Patents

Abstract

(57) [Problem] To provide a highly efficient rotating electric machine with a stator structure using concentrated winding. SOLUTION: A tooth portion 3 and a yoke portion 12 are formed from a grain-oriented magnetic steel sheet so that an easy magnetization direction coincides with a flow direction of a magnetic flux flowing through a stator core.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator and a rotor structure of a rotating electric machine constituted by concentrated winding in which each tooth portion is directly wound, and a method of manufacturing the same. The present invention relates to a compressor used as an electric motor.

[0002]

2. Description of the Related Art In recent years, in the field of motors for compressors, high-efficiency DC brushless motors whose rotation speed is easy to control and whose loss is reduced have been widely used for improving the performance of motors. Referring to FIG. 11, a three-phase six-slot four-pole D
The structure of the motor will be described using a C brushless motor as an example. In this figure, 1 is a stator, 2 is a slot, 3 is a teeth portion, 4 is a winding, 5 is a rotor shaft, 7 is a permanent magnet, 8 is a gap, 9 is a rotor, 10 is a stator core, 11 Is a rotor core.

[0003] A cylindrical stator core 10 and an inner peripheral portion of the stator core 10 are partitioned by teeth portions 3,
The stator 1 is composed of six slots 2 formed at equal intervals, a winding 4 having three phases and four poles formed by directly winding the teeth 3 adjacent to the slots 2 to form concentrated winding. Is configured. A rotor 9 is disposed with a gap 8 slightly smaller than the inner diameter of the stator 1, and the rotor 9 is fitted and fixed in a central hole provided in the center and supported so as to be rotatable. 5 and permanent magnets 7 arranged together with the outer peripheral magnetic body of the rotor and arranged such that N poles and S poles are alternately arranged. A non-oriented electrical steel sheet is used for the core material.

FIG. 12 shows a driving circuit and a driving principle of a motor.
This will be described with reference to FIG. This figure shows a typical motor drive circuit often used for driving a motor of a compressor. The motor drive circuit includes a DC power supply unit 15, a main circuit unit 16, and a control circuit unit 17. The DC power supply 15 is connected in parallel with the main circuit and supplies power to the main circuit 16. On the other hand, the main circuit section 16 includes six switching elements Ua, Ub, Va, Vb, Wa, Wb and free-wheeling diodes D1, D2 connected in parallel to the respective switching elements.
.. D6, the switching elements Ua and Ub are connected in series, and the arm portion Uab is connected to the switching element Va.
And Vb are connected in series to form an arm Vab, and similarly, switching elements Wa and Wb are connected in series to form an arm Wab, so that a total of three arms are formed. Further, the arm portions Uab, Vab, and Wab are connected in parallel,
A phase bridge is formed. In this main circuit section, the common nodes Uo, Vo, Wo of the switching elements of the three-phase arms Uab, Vab, Wab are connected to the corresponding output lines U, V, W of the electric motor. These output lines U, V, W are connected to the windings 4 of each phase of the stator 1. Each phase winding is composed of a U phase, a V phase, and a W phase, and is Y-connected.

The control circuit receives a position signal of the rotor 9 by the position detecting section 18 and controls the switching elements of the main circuit to turn on and off in response to the signal, thereby supplying a current to the winding 4. As a result, an alternating magnetic field is generated in the stator 1, and the rotor 9 is rotated by the magnetic attraction and repulsion acting between the alternating magnetic field and the magnetic flux generated by the permanent magnet 7. The energization width of each winding U-phase, V-phase, and W-phase is 120 degrees in electrical angle.

FIG. 13 shows the flow of the magnetic flux at this time. This figure shows the magnetic flux 19 flowing through the stator and the rotor,
This is a distribution at a position where the BIL torque (torque acting between the magnetic flux generated by the current of the winding and the magnetic flux generated by the permanent magnet) becomes maximum when the phase and the V phase are in the energized state. Also, 2
1a and 21b indicate the direction of the current, 21a indicates an upward current with respect to the paper surface, and 21b indicates a downward current with respect to the paper surface. According to this figure, the magnetic flux is the stator core 1
It can be seen that the zero yoke portion 12 flows along the circumferential direction and the teeth portion 3 flows along the radial direction. Therefore, the flow of magnetic flux is roughly divided into two directions, a circumferential direction and a radial direction.

FIG. 14 shows a Japanese Patent Application Laid-Open Publication No.
FIG. 88 is a cross-sectional view showing another conventional example disclosed at 88. This figure shows an example of a DC brushless motor having 9 slots and 8 poles. Three stator pieces 6a to 6c each having a tooth portion and a yoke portion are used as one unit core, and the three unit cores are combined into one fixed unit. The child 1 is constituted. FIG. 14A is a plan view showing a unit core including three stator pieces 6 in the rotating electric machine, and FIG.
14C is a plan view showing a state where the electric wire is wound around the stator piece 6 shown in FIG. 14, and FIG. 14C is a plan view showing a state where the stator piece 6 in a state where the winding shown in FIG. FIG. 14D is a plan view showing a stator of the rotating electric machine configured by bending and then collecting and combining the stator pieces 6 shown in FIG. In the figure, reference numeral 10 denotes a stator core, which is formed by stacking a required number of electromagnetic steel sheets having a small thickness and caulking, welding, or the like so that the electromagnetic steel sheets are not separated one by one.
Reference numeral 2 denotes a slot provided with an insulator 20, and reference numerals 4a to 4e denote windings, which are formed by applying windings to the teeth portion 3 of the iron core one turn at a time. Reference numerals 6a to 6c denote stator pieces, which are connected and integrated by a thin connecting portion 13 which is an outer peripheral portion of the stator of the rotating electric machine.

FIG. 15 is a Japanese Patent Application Laid-Open No. 7-6727.
FIG. 3 is a diagram illustrating a stator structure of the synchronous machine disclosed in FIG. The yoke part 12 and the teeth part 3 of the stator 1 are divided by another piece, and the yoke part 12 is further divided in the circumferential direction.
To form a stator piece, and further to form the stator 1 by combining the stator pieces. The yoke portion 12 and the teeth portion 3 are made of a grain-oriented magnetic steel sheet, and the directions of easy magnetization of the yoke portion
2 is configured to be in the circumferential direction, and the teeth portion 3 is configured to be in the radial direction.

FIG. 16 (a) is a Japanese Patent Application Publication No.
FIG. 23 is a diagram showing a stator structure of the synchronous machine disclosed in 23830. 16 (b) and 16 (c) are views showing a manufacturing process of a laminated steel sheet piece. A substantially T-shaped laminated steel sheet piece having a tooth portion and a yoke portion is formed by punching out a bidirectional silicon steel sheet so that the tooth portion substantially matches the direction of easy magnetization, and the laminated steel plates are laminated and connected. ing.

FIG. 17 is a Japanese Patent Application Laid-Open Publication No. Hei 8-2238.
FIG. 32 is a plan view showing a rotor core and a stator core of the synchronous machine disclosed in 31. An iron core body 11 made of a laminated steel sheet made of a bidirectional electromagnetic steel sheet, and a permanent magnet 7 mounted on the outer periphery of the iron core body, wherein the hard magnetic directions in the iron core body 11 are the north pole and south pole of the permanent magnet 7. Is configured to be in the same direction as the direction.

[0011]

The structure of the conventional motor using the concentrated winding configured as described above has the following problems. Since it is made of non-oriented electrical steel sheet, there is a limit to the improvement of iron loss by improving the magnetic circuit, which has hindered the improvement of efficiency. In addition, attempts have been made to use a bidirectional magnetic steel sheet for the iron core material instead of the non-oriented magnetic steel sheet, but no attempt has been made to increase the efficiency so much. This is because iron loss and the like have not been significantly improved in the range where the magnetic flux is concentrated. Japanese Patent Application Laid-Open No. 7-67272 using a grain-oriented electrical steel sheet is effective in reducing iron loss, but punches out the yoke part 12 and the tooth part 3 with separate pieces and then combines the yoke part 12 and the tooth part 3. Therefore, assemblability is poor, and it is difficult to ensure roundness of the inner and outer diameters. Also, the yoke part 12
Since it is necessary to prepare a mold for each of the tooth part and the teeth part 3, the mold cost is increased and the number of steps in the manufacturing line is increased. Therefore, it is difficult to obtain an advantage as a whole.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can improve iron loss and the like to improve efficiency, improve productivity, recyclability, and accuracy of inner and outer diameters. It is an object of the present invention to obtain a rotating electric machine capable of performing the method and a manufacturing method thereof. Another object is to obtain a highly efficient compressor.

[0013]

A rotating electric machine according to the present invention includes a tooth portion and a yoke portion formed from a directional magnetic steel sheet so that the direction of easy magnetization coincides with the flow direction of a magnetic flux flowing through a stator core. It is.

Further, the teeth portion and the yoke portion are formed by punching from a bidirectional electromagnetic steel plate.

Further, a thin connecting portion for connecting the teeth portion and the yoke portion is provided.

Further, the teeth portion and the yoke portion forming a slot on one side of the teeth portion are formed into one piece, and the direction of easy magnetization of the teeth portion and the yoke portion is determined by the flow direction of the magnetic flux flowing through the stator core. It is formed from a bidirectional magnetic steel sheet so as to match.

Further, a thin connecting portion for connecting the yoke portion forming the slot on the other side of the tooth portion and the tooth portion is provided.

Further, the yoke portion is continuous between the teeth portions.

Further, the yoke portion is divided so that the vicinity of the boundary of the winding group in the slot is a joint on the side of the yoke portions facing the slot.

[0020] Further, the yoke portions are connected in parallel, and a thin-walled connecting portion that can be bent and formed on a cylindrical stator is provided.

The tooth part, the tooth tip protruding from the tooth part in the rotor rotation direction, and a thin connecting part connecting the tooth part and the tooth tip are provided. Are formed from grain-oriented electrical steel sheets such that the direction of easy magnetization substantially coincides with the flow direction of the magnetic flux flowing through the stator core.

Further, the stator is a concentrated winding of 9 slots.

[0023] Further, the present invention is a rotor of a rotating electric machine including an iron core body in which a laminated steel sheet is formed of a bidirectional electromagnetic steel sheet, and a permanent magnet embedded in the iron core body. The permanent magnet is configured so as to match the directions of the north pole and the south pole of the permanent magnet.

A compressor according to the present invention uses the rotating electric machine as an electric motor.

In the method for manufacturing a rotating electric machine according to the present invention, the teeth and the yoke are formed by punching out a bidirectional magnetic steel sheet so that the direction of easy magnetization coincides with the flow direction of the magnetic flux flowing through the stator core.

Further, the stator pieces are connected in parallel by thin connecting portions, and the teeth and the yoke are made of a bidirectional magnetic steel sheet so that the direction of easy magnetization substantially coincides with the flow direction of the magnetic flux flowing through the stator core. The stator pieces are formed by punching, and the stator pieces are laminated and bent into a cylindrical shape to form a stator.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to FIG.
(A) to (c) will be described with reference to FIG. A drive circuit when the rotating electric machine of the present embodiment is used as a compressor motor is as shown in FIG. 12, which is the same as the description of FIG. I do. FIG. 13 shows a state of the magnetic flux when the rotor is rotating. The magnetic flux is inclined with respect to the side surface of the teeth at the teeth where the magnetic flux is concentrated or at the tip of the teeth.

FIG. 1 (a) shows an example of a stator piece of a stator according to a first embodiment of the present invention. In the figure, reference numeral 3 denotes a slot formed on both sides and a tooth portion around which a winding is wound; Reference numeral 12 denotes a yoke portion that forms the outer peripheral side of the slot, and the teeth portion 3 and the yoke portion 12 form a stator piece 6. 1
Reference numeral 4 denotes an easy magnetization direction of the teeth 3 and the yoke 12. The teeth portion 3 is tilted in the direction opposite to the rotation direction of the rotor with respect to the easy magnetization direction so that the stator piece 6 has a structure having the easy magnetization direction in the direction of the arrow 14. A bidirectional electromagnetic steel sheet of about 0.35 mm is punched out using a mold having the cross-sectional shape of the teeth 3 and the yoke 12 so as to match the flow of the magnetic flux flowing through the stator core.

In this embodiment, the stator piece 6 is the yoke 1
The stator pieces 6 are stacked in a required number of pieces and fixed by caulking, welding or the like so as not to be separated. FIG.
1B, the teeth 3 and the yoke 12 punched out as shown in FIG. 1A are connected to each other to form a stator block 6 for one block. FIG. 1 (c) is FIG. 1 (d)
An insulating portion 20 made of a non-magnetic, non-conductive material having a thickness of 1 mm or less is applied along the slot portion 2 of the stator piece 6 shown in FIG. It is sectional drawing of the stator piece 6.

FIG. 1D shows a cylindrical shape obtained by combining the blocks of the stator piece 6 having the windings shown in FIG. 1C over one round. The joint portion of each stator piece 6 is fixed by welding or the like and integrated to form the stator 1. By configuring the stator 1 in this manner, the easy magnetization direction of the stator core is in the circumferential direction in the yoke portion 12 and in the direction 14 slightly inclined in the reverse rotation direction of the rotor with respect to the radial direction in the teeth portion 3. Become. Therefore, it is possible to make the easy magnetization direction of the stator constituted by using the bidirectional magnetic steel sheet coincide with the flow of the magnetic flux actually flowing through the stator core.

As described above, according to the first embodiment of the present invention, the stator is configured such that the direction of easy magnetization of the bidirectional magnetic steel sheet coincides with the direction of the magnetic flux flowing through the stator core. It is possible to realize a highly efficient electric motor with improved magnetic characteristics and reduced iron loss. In the concentrated winding stator 1 having 9 slots, the direction of easy magnetization of the teeth portion 3 and the flow of magnetic flux flowing through the stator core are made to coincide with each other.
The direction of easy magnetization on the rotor rotation direction side 3c of the tip of the magnetic pole teeth 3 substantially coincides with the flow direction of the magnetic flux flowing through the stator core, so that higher efficiency can be achieved. The rotor rotation direction side 3c of the tip of the magnetic pole teeth 3 is not limited to 9 slots. By matching the direction of easy magnetization of the teeth 3 with the flow of magnetic flux flowing through the stator core, the rotor rotation direction side of the tip of the magnetic pole teeth 3 is adjusted. The direction of easy magnetization of 3c approaches a direction coinciding with the direction of flow of the magnetic flux flowing through the stator core.

Embodiment 2 FIG. FIG. 2A shows an example of a stator piece 6 of the stator 1 according to the second embodiment of the present invention. Portions that are the same as or correspond to those in Embodiment 1 are given the same reference numerals, and descriptions thereof are omitted. In the first embodiment, the stator piece 6 is divided into two parts by the yoke part 12 and the tooth part 3, but in the second embodiment, the end of the tooth part 3 in the rotation direction at the base is thinned by the thin connecting part 13 and the yoke part 12. The teeth 3 are rotatable about the thin connecting portion 13 as a fulcrum. FIG. 2B shows the teeth portion 3 and the yoke portion 12 with the thin connecting portion 13 as a fulcrum as compared with FIG.
To form a stator block 6 for one block. FIG. 2 (c) shows the required number of stator pieces shown in FIG. 2 (b) stacked, welded, caulked, etc., and along the slot 2 of the stator piece 6 shown in FIG. FIG. 5 is a cross-sectional view of a stator piece 6 in which an insulator 20 is applied with the following non-magnetic and non-conductive material, and electric wires are aligned and wound around the teeth 3 a predetermined number of times.

FIG. 2 (d) shows a cylindrical shape obtained by combining the blocks of the stator piece 6 provided with the windings shown in FIG. 2 (c) over one round. The joint portion of each stator piece 6 is fixed by welding or the like and integrated to form the stator 1. By configuring the stator 1 in this way, the direction of easy magnetization of the stator core is in the circumferential direction in the yoke portion 12 and in the direction of the arrow 14 in the teeth portion 3 (see FIG. 13).
Therefore, it is possible to make the easy magnetization direction of the stator constituted by using the bidirectional magnetic steel sheet coincide with the flow of the magnetic flux actually flowing through the stator core.

As described above, according to the invention of the second embodiment, the stator is configured such that the easy magnetization direction of the bidirectional electromagnetic steel sheet coincides with the direction of the magnetic flux flowing through the stator core. It is possible to realize a highly efficient electric motor with improved magnetic characteristics and reduced iron loss. Also, the magnetic teeth 3
And the yoke portion 12 are integrally punched out, so that an electric motor having better assemblability and a high dimensional accuracy of the inner and outer diameters can be configured as compared with a method of punching out the magnetic teeth portion 3 and the yoke portion 12 with separate pieces and assembling them later. .

Embodiment 3 FIG. FIG. 3A shows an example of the stator piece 6 of the stator 1 according to the third embodiment of the present invention. Portions that are the same as or correspond to those in Embodiment 1 are given the same reference numerals, and descriptions thereof are omitted. In the first embodiment, the stator piece 6 is divided at the root of the teeth 3 and the yoke 12 by a line connecting the inner periphery of the yoke 12 with a straight line. The yoke part 12 is divided by a line connecting the center of the outer peripheral part of the yoke part (on the extension line from the center of the teeth part 3 in the centrifugal direction) and one of the roots of the teeth part 3 and the yoke part 12 with a straight line.

FIG. 3 (b) shows the teeth portion 3 from FIG. 3 (a).
Are connected to the yoke portion 12 to form the stator piece 6 for one block. FIG. 3 (c) shows an example in which an insulator 20 made of a non-magnetic, non-conductive material having a thickness of 1 mm or less is applied along the slot portion 2 of the stator piece 6, and the electric wires are aligned on the teeth portion 3 a predetermined number of times. It is sectional drawing of the stator piece 6 wound.
With the above configuration, the same effect as in the first embodiment can be obtained. Further, since the teeth portion 3 and the yoke portion 12 form one piece and the relative positions are fixed, it is possible to obtain a motor having high dimensional accuracy.

Embodiment 4 FIG. FIG. 4A shows a fourth embodiment.
FIG. 4 is a development view showing a stator piece 6 for one block according to FIG.
Portions that are the same as or correspond to those in Embodiment 1 are given the same reference numerals, and descriptions thereof are omitted. In the second embodiment,
The teeth part 3 and the yoke part 12 are divided into two parts,
3, but in the fourth embodiment, the teeth 3
And the yoke portion 12 are connected to each other by a thin connecting portion 13 which is the center of the outer peripheral portion of the yoke portion, thereby forming one integral stator. The teeth portion 3 and the yoke portion 12 are shown in FIG.
The positional relationship as shown in FIG.
The teeth portion 3 is inclined in the direction opposite to the rotation direction of the rotor with respect to the easy magnetization direction so as to have a structure having the easy magnetization direction in the direction of 4, and the teeth portion 3 has the easy magnetization direction of the magnetic flux flowing through the stator core. According to the flow, a bidirectional electromagnetic steel sheet of about 0.35 mm is punched out using a mold having the cross-sectional shape of the teeth 3 and the yoke 12.

FIG. 4 (b) shows that the teeth portion 3 is connected to the yoke portion 12 with the thin connecting portion 13 as a fulcrum as compared with FIG.
The stator pieces 6 for the blocks are configured. FIG.
4C, an insulator 20 made of a non-magnetic, non-conductive material having a thickness of 1 mm or less is applied along the slot portion 2 of the stator piece 6 shown in FIG. It is sectional drawing of the stator piece 6 which wound the electric wire in alignment. FIG.
The stator 1 can be configured by combining and joining the stator pieces 6 of (c) into a cylindrical shape over one circumference. With the above configuration, the second embodiment
It has the same effect as. Further, while maintaining high dimensional accuracy between the teeth portion 3 and the yoke portion 12 as in the third embodiment, the direction of easy magnetization of the teeth portion 3 and the yoke portion 12 matches the flow of the magnetic flux flowing through the stator core. Can be done.

Embodiment 5 FIG. 5A shows the fifth embodiment.
FIG. 4 is a development view showing a stator piece 6 for one block according to FIG.
Portions that are the same as or correspond to those in Embodiment 1 are given the same reference numerals, and descriptions thereof are omitted. In this figure, the teeth portion 3 and the yoke portion 12 are connected by a straight line between the center of the outer peripheral portion of the yoke portion (on the extension line from the center of the teeth portion 3 in the centrifugal direction) and one of the roots of the teeth portion 3 and the yoke portion 12. The yoke portion 12 is continuously formed by the length extending between the adjacent tooth portions 3 when the circular stator 1 finally becomes the one shown in FIG. It forms almost all of the slot on one side of the part 3 in the circumferential direction).

The yoke portion 12 and the teeth portion 3 are formed by punching a bidirectional electromagnetic steel sheet of about 0.35 mm so that the stator piece 6 has a structure having an easy magnetization direction in the direction of arrow 14. The stator piece 6 is formed by punching the yoke portion 12 and the teeth portion 3 integrally into an L-shape, stacking the required number of pieces, and fixing them by caulking, welding, or the like so as not to be separated. FIG. 5B shows the state along the slot 2 of the stator piece 6.
FIG. 4 is a cross-sectional view of a stator piece 6 in which an insulator 20 is applied with a non-magnetic, non-conductive material having a thickness of 1 mm or less, and electric wires are aligned and wound around the teeth 3 a predetermined number of times. The stator 1 can be configured by combining and joining the stator pieces 6 of FIG. 5B in a cylindrical shape over one circumference.

With the above-described configuration, the magnetic properties can be improved as compared with the case where the stator piece 6 is divided into the yoke portion 12 and the teeth portion 3. The direction of easy magnetization can be matched with the flow of the magnetic flux flowing through the stator core. Furthermore, an electric motor having good assemblability and good dimensional accuracy of the inner and outer diameters can be realized. Further, by dividing the motor so that the divided cross section is minimized, it is possible to realize an electric motor having good magnetic characteristics.

Embodiment 6 FIG. FIG. 6A shows an example of the stator piece 6 of the stator 1 according to the sixth embodiment of the present invention. Portions that are the same as or correspond to those in Embodiment 5 are given the same reference numerals, and descriptions thereof are omitted. In the fifth embodiment, the yoke portion 12 and the teeth portion 3 are integrally punched into an L-shape. In the sixth embodiment, the yoke portion 12 and the teeth portion 3 are divided while maintaining the slot shape corresponding to the winding. That is, a part of the inner peripheral side of the yoke portion 12 is protruded from the teeth portion 3 in the reverse rotation direction of the rotor so that the joint of the portion of the yoke portion 12 facing the slot is located at the center in the circumferential direction of the slot. 3
, And comes into contact with the outer peripheral side of the yoke portion 12 extending in the rotor rotation direction.

FIG. 6B shows an insulator 20 made of a non-magnetic, non-conductive material having a thickness of 1 mm or less along the slot portion 2 of the stator piece 6, and an electric wire is applied to the teeth portion 3 a predetermined number of times. It is sectional drawing of the stator piece 6 wound in alignment. FIG.
The stator 1 can be configured by combining and joining the stator pieces 6 of (b) in a cylindrical shape over one circumference. With the above configuration, the yoke portion 1
Since the joint portion between the two is located in the middle of the slot in the circumferential direction, the winding can be smoothly wound around the teeth 3, the workability of the winding is improved as compared with the fifth embodiment, the assembling property is good, and the inside and outside can be improved. An electric motor with good dimensional accuracy in diameter can be realized.

Embodiment 7 FIG. FIG. 7A is a developed view of a continuous stator piece 6 according to the seventh embodiment. Embodiment 2
Among them, the thin connecting portion 13 is referred to as a thin connecting portion 13A, and the same or corresponding portions are denoted by the same reference numerals and description thereof is omitted. In this drawing, the stator piece 6 is indicated by the arrow 1
Nine thin-walled stator pieces 6 are punched from a bidirectional electromagnetic steel sheet 23 having a thickness of about 0.35 mm so as to have a structure having an easy magnetization direction in the direction 4. The stator piece 6 is composed of a yoke part 12 and a tooth part 3, and the yoke part 12 and the tooth part 3 are connected to the thin connecting part 13 in the same manner as in the second embodiment.
Connected by A. The adjacent yoke portions 12 are connected at their outer peripheral ends by thin connecting portions 13B. The required number of the stator pieces 6 are stacked and fixed by caulking, welding, or the like so as not to be separated.

FIG. 7 (b) shows a thinner connecting portion 1 than FIG. 7 (a).
The teeth portion 3 is connected to the yoke portion 12 with 3A as a fulcrum.
The stator pieces 6 for the blocks are configured. FIG.
(C) is 1 mm thick along the slot 2 of the stator piece 6.
FIG. 5 is a cross-sectional view of a stator piece 6 in which an insulator 20 is applied with the following non-magnetic and non-conductive material, and electric wires are aligned and wound around the teeth 3 a predetermined number of times.

The stator piece 6 on which the winding shown in FIG. 7 (c) is applied is fixed to the thin connecting portion 13B at the outer peripheral end of the yoke portion 12 as a fulcrum.
When each of the stator pieces is bent in the circumferential direction to make the connected blocks cylindrical, a stator 1 similar to that shown in FIG. 2D is obtained. The joints of the stator pieces 6 are fixed by welding or the like and integrated to form a stator. By configuring the stator in this manner, the direction of easy magnetization of the stator core is in the circumferential direction in the yoke portion 12 and in the direction inclined in the direction opposite to the rotor rotation direction from the radial direction of the stator in the teeth portion 3. Become. Therefore, it is possible to make the easy magnetization direction of the stator constituted by using the bidirectional magnetic steel sheet coincide with the flow of the magnetic flux actually flowing through the stator core. Further, since nine consecutive stator pieces 6 are integrally punched out, the magnetic characteristics can be improved as compared with the second embodiment, and the assemblability is good, and the dimensional accuracy of the inner and outer diameters is good. However, a good electric motor can be realized.

Embodiment 8 FIG. FIG. 8A is a developed view of a continuous stator piece 6 according to the eighth embodiment. Embodiment 5
The same or corresponding parts are denoted by the same reference numerals and description thereof is omitted. In the fifth embodiment, one stator 1 is formed by combining and joining together the blocks of the stator piece 6 in a cylindrical shape over one circumference. In the eighth embodiment, adjacent yoke portions 12 are connected to each other by thin connecting portions 13 on the outer peripheral side to form nine continuous stator pieces 6.

FIG. 8B shows the stator piece 6 shown in FIG.
A non-magnetic, non-conductive material 20 having a thickness of 1 mm or less is provided along the slot portion 2 of the stator 20 and a wire is aligned and wound around the teeth portion 3 a predetermined number of times. is there. FIG. 8 (c) shows the stator piece 6 with the winding shown in FIG. 8 (b) being bent in the circumferential direction by using the thin connecting portion 13 at the outer peripheral end of the yoke portion 12 as a fulcrum. , And the connected blocks are cylindrical. The joints of the stator pieces 6 are fixed by welding or the like to form the stator 1 integrally.

By configuring the stator 1 in this manner, the easy magnetization direction of the stator core is inclined in the circumferential direction in the yoke portion 12 and in the teeth portion 3 in the direction opposite to the rotor rotation direction from the radial direction of the stator. This is the direction of the arrow 14 which is the direction of the movement. Therefore, the easy magnetization direction of the stator constituted by using the bidirectional magnetic steel sheet 23 can be matched with the flow of the magnetic flux actually flowing through the stator core. With the configuration described above, the same effects as those of the fifth embodiment can be obtained, and further, an electric motor with good assemblability and good dimensional accuracy of the inner and outer diameters can be realized. Also, in the sixth embodiment, the present embodiment can be easily applied by connecting the adjacent yoke portions 12 with the thin connecting portions 13 on the outer peripheral side.

Embodiment 9 FIG. FIG. 9A is an expanded view of a continuous stator piece 6 according to the ninth embodiment. Nine thinly connected stator pieces 6 are punched out of a bidirectional electromagnetic steel sheet 23 having a thickness of about 0.35 mm so that the stator pieces 6 have a structure having an easy magnetization direction in the direction of arrow 14. Stator piece 6
Is comprised of a yoke portion 12 and a tooth portion 3, and furthermore, the tooth portion 3 has a main portion 3A, a rotor tip end portion 3B in the reverse rotation direction, and a rotor tip portion 3C in the rotor rotation direction.
Consists of The yoke part 12 and the teeth part 3 are connected by a thin connecting part 13A, and the teeth part 3 is connected to the thin connecting part 13A.
It is configured to be rotatable around A.

Of the teeth portion 3, the main portion 3A and the tooth tip portion 3B are connected on the inner peripheral side by a thin connecting portion 13C, and the tooth tip portion 3B is rotatable about the thin connecting portion 13C as a fulcrum. ing. The other tooth tip 3
C is integral with the main part 3A. Also, the adjacent yoke part 1
2 are connected by a thin connecting portion 13B. The required number of the stator pieces 6 are stacked and fixed by caulking, welding, or the like so as not to be separated.

FIG. 9 (b) shows a thinner connecting portion 1 than FIG. 9 (a).
The teeth portion 3 is connected to the yoke portion 12 using 3A as a fulcrum, and the tip 19 of the tooth portion is connected to the teeth portion 3 using the thin connecting portion 13C as a fulcrum, thereby forming the stator pieces 6 for nine blocks. FIG. 9 (c) shows the state along the slot portion 2 of the stator piece 6.
FIG. 4 is a cross-sectional view of a stator piece 6 in which an insulator 20 is applied with a non-magnetic, non-conductive material having a thickness of 1 mm or less, and electric wires are aligned and wound around the teeth 3 a predetermined number of times.

The stator piece 6 with the winding shown in FIG. 9C is attached to the thin connecting portion 13B at the outer peripheral end of the yoke portion 12 as a fulcrum.
Each stator piece is bent in the circumferential direction to make the connected blocks cylindrical. The joints of the stator pieces 6 are fixed and integrated by welding or the like to constitute a stator. By configuring the stator in this manner, the easy magnetization direction of the stator core is in the circumferential direction in the yoke portion 12 and in the direction of the arrow 14 in the teeth portion 3. Therefore, the easy magnetization direction of the stator formed by using the bidirectional magnetic steel sheet 23 and the flow of the magnetic flux actually flowing through the stator core can be matched in the yoke part and the main part and the tooth tip part of the tooth part, The magnetic characteristics can be further improved as compared with the seventh embodiment.

Further, by constructing the stator as described above, it is possible to realize an electric motor which has good dismantling properties such as easy winding, and takes recycling into consideration. The winding can be removed by bending or breaking the tooth tip 3B using the fulcrum 13C. Thereafter, the winding can be extracted from the main portion 3A in the direction of the tooth tip 3C.

Embodiment 10 FIG. FIG. 10 shows a tenth embodiment.
1 shows a configuration of a rotor (rotor) iron core. In the figure, reference numeral 9 denotes a rotor core, which includes a core body 11 formed by punching and laminating from a bidirectional electromagnetic steel sheet, and a permanent magnet 7 embedded in the core body 11.
Are arranged so that the easy magnetization directions in the above-mentioned directions coincide with the directions of the N pole and the S pole of the permanent magnet. Reference numeral 5 denotes a rotor shaft, which serves as a rotary drive shaft of the compressor when used as a compressor motor.

As described above, according to the tenth embodiment, the easy magnetization direction of the bidirectional electromagnetic steel sheet is changed to the N direction of the permanent magnet.
By configuring the rotor core 9 so as to coincide with the directions of the poles and the south poles, the magnetic flux of the permanent magnet flows easily in the easy magnetization direction of the rotor core 9 outside the permanent magnet of the rotor core 9 and is fixed. Since the magnetic flux of the element easily flows in the magnetization direction, the iron loss can be reduced and the efficiency can be increased. Further, the magnetic flux 25 flowing through the rotor core 9 has a portion flowing in the easy magnetization direction longer than a portion flowing in the difficult magnetization direction, so that the magnetic resistance is small and the efficiency can be improved.

In the present embodiment, an electric motor mainly used for a compressor has been described. However, the present invention is also applicable to, for example, a generator using the same principle, and is widely applicable to these rotating electric machines. is there. Embodiment 1
Although the rotor according to the present embodiment is used for the stators of Nos. 1 to 9, the above-described effects can be obtained as a stator using a conventional rotor. The above-described effects can be obtained even when the rotor according to the present embodiment is used for a conventional stator.

Embodiment 11 FIG. FIG. 18 is a conceptual diagram showing a compressor equipped with the electric motor of the above-described first to tenth embodiments. The same parts as those shown in FIG. The description is omitted. Reference numeral 30 denotes an electric motor including the stator 1 according to any one of Embodiments 1 to 9 or the rotor 9 according to Embodiment 10, and 31 denotes a compressor driven by the electric motor 30. The compressor is connected to a generally used refrigeration cycle (compressor 31 → four-way valve → condenser or evaporator → throttle device → evaporator or condenser → four-way valve → compressor 31) in order through refrigerant piping. Refrigeration air-conditioning cycle device), and the refrigerant is R1
HFC represented by 34A, R410A, R407C, etc.
As the refrigerating machine oil, a weakly compatible oil represented by an alkylbenzene-based oil or a compatible oil represented by an ester oil is used. The compressor 31 is inverter-driven by the control circuit 17.

In the compressor configured as described above, the stator 1 and the rotor core 9 of the driving motor have high efficiency and high torque. In the compressor driven by the inverter, the optimum value of the input and the efficiency fluctuates for each frequency. However, in the compressor of the present embodiment, the efficiency can be improved over a wide compressor frequency range driven by the inverter. It is possible to increase efficiency. Further, since the frequency range can be expanded, the utility value of the compressor can be increased. Further, when a high-pressure refrigerant such as R410A is used as compared with the conventional R22, the time during which the refrigerant is in a high-pressure state at the time of starting the refrigeration cycle can be shortened, so that the reliability of the refrigeration cycle can be improved.

[0060]

As described above, according to the rotating electric machine of the present invention, the following effects can be obtained. The motor is equipped with teeth and a yoke that are made of grain-oriented electrical steel so that the direction of easy magnetization matches the flow direction of the magnetic flux flowing through the stator core. Obtainable.

Further, since the teeth and the yoke are formed by punching out a bidirectional magnetic steel sheet, they can be easily manufactured at low cost.

Further, since the teeth portion and the yoke portion are provided with a thin connecting portion for joining the teeth portion and the yoke portion, the teeth portion and the yoke portion are integrally punched. In comparison, a rotating electric machine with good assemblability and good dimensional accuracy of the inner and outer diameters can be realized. The effect of improving the assemblability is obtained.

The teeth portion and the yoke portion forming a slot on one side of the teeth portion are formed as one piece, and the direction of easy magnetization of the teeth portion and the yoke portion is determined by the direction of flow of magnetic flux flowing through the stator core. Since it is formed from the bidirectional magnetic steel sheet so as to match, the iron loss can be reduced, and a high-efficiency, high-torque rotating electric machine can be obtained.

Further, since the thin portion connecting the yoke portion and the tooth portion forming the slot on the other side of the tooth portion is provided, the direction of easy magnetization of the yoke portion is such that the direction of magnetic flux flowing through the stator core is reduced. The direction becomes more consistent, the iron loss can be reduced, and a high-efficiency, high-torque rotating electric machine can be obtained. In addition, as compared with a method in which the yoke portions are punched out by separate pieces and then assembled, a rotating electric machine with good assemblability and good dimensional accuracy of the inner and outer diameters can be realized. The effect of improving the assemblability is obtained.

Further, since the yoke portion is continuous between the teeth portions, iron loss can be reduced, and a motor with higher efficiency and increased torque can be obtained. In addition, as compared with the case where the tooth portion and the yoke portion are divided, a rotating electric machine having good assemblability and good dimensional accuracy of the inner and outer diameters can be obtained.

Further, the yoke portion is divided so that the vicinity of the boundary of the winding group in the slot is a joint portion on the side of the yoke portion facing the slot, and the stator piece shape is maintained in the slot shape. As compared with the method in which the winding is easy to wind and the teeth portion and the yoke portion are divided, a rotating electric machine having good assemblability and good dimensional accuracy of the inner and outer diameters can be realized.

Further, since the yoke portions are connected in parallel and a thin-walled connecting portion which can be bent and formed on a cylindrical stator is provided,
It is possible to obtain a rotating electric machine that can reduce iron loss, increase efficiency, and increase torque. In addition, a plurality of stator pieces are collectively referred to as a unit core required to form one coil, and the stator pieces of the unit core are connected to each other by a thin connecting portion at an outer peripheral portion of the stator. Since the stator is integrally formed and the stator piece is bent into a cylindrical shape by the thin-walled connecting portion to form the stator, it is possible to realize a rotating electric machine with better assemblability and good inner and outer diameter dimensional accuracy.

The tooth part, a tooth tip protruding from the tooth part in the direction of rotor rotation, and a thin connecting part for connecting the tooth part and the tooth tip are provided. Formed from grain-oriented electrical steel sheet so that the direction of easy magnetization almost coincides with the direction of flow of the magnetic flux flowing through the stator core, so that iron loss in the teeth can be reduced and a high-efficiency, high-torque rotating electric machine can be obtained. it can.

Further, since the stator is formed by concentrated winding of 9 slots, the direction of easy magnetization of the teeth is made substantially coincident with the direction of flow of magnetic flux flowing through the stator core. In the direction of flow of the magnetic flux flowing through the wire.

Also, the present invention is a rotor for a rotating electric machine including an iron core body in which a laminated steel sheet is formed of a bidirectional electromagnetic steel sheet, and a permanent magnet embedded in the iron core body, wherein the easy magnetization direction in the iron core body is Since the configuration is such that the directions of the N pole and the S pole of the permanent magnet coincide with each other, it is possible to reduce the iron loss, to obtain a motor with higher efficiency and increased torque.

Further, according to the compressor of the present invention, since the rotating electric machine according to any one of claims 1 to 11 is used as a motor, a rotating electric machine with high efficiency and high torque can be obtained.

According to the method for manufacturing a rotating electric machine of the present invention, the teeth and the yoke are formed by punching out a bidirectional electromagnetic steel sheet so that the direction of easy magnetization coincides with the flow direction of the magnetic flux flowing through the stator core. Therefore, iron loss can be reduced, and a high-efficiency, high-torque rotating electric machine can be easily manufactured.

Further, the stator pieces are connected in parallel by thin connecting portions, and the teeth and the yoke are made of a bidirectional magnetic steel sheet so that the direction of easy magnetization substantially coincides with the flow direction of the magnetic flux flowing through the stator core. Since the stator pieces are formed by punching, and the stator pieces are laminated and bent into a cylindrical shape to form a stator, a rotating electric machine having good assemblability and good dimensional accuracy of the inner and outer diameters can be manufactured.

[Brief description of the drawings]

FIG. 1 (a) is a developed sectional view of a stator piece according to Embodiment 1 of the present invention. (b) Sectional drawing which laminated | stacked and combined the stator piece of (a). (c) Sectional drawing which insulated and wound the stator piece of (b). Sectional drawing which constituted the stator by combining the stator pieces of (d) and (c).

FIG. 2 (a) is a developed sectional view of a stator piece according to a second embodiment of the present invention. (b) Sectional drawing which laminated | stacked and bent the stator piece of (a). (c) Sectional drawing which insulated and wound the stator piece of (b). Sectional drawing which constituted the stator by combining the stator pieces of (d) and (c).

FIG. 3A is an expanded sectional view of a stator piece according to a third embodiment of the present invention. (b) Sectional drawing which laminated | stacked and combined the stator piece of (a). (c) Sectional drawing which insulated and wound the stator piece of (b).

FIG. 4A is an expanded sectional view of a stator piece according to a fourth embodiment of the present invention. (b) Sectional drawing which laminated | stacked and bent the stator piece of (a). (c) Sectional drawing which insulated and wound the stator piece of (b).

FIG. 5 (a) is a sectional view of a stator piece according to a fifth embodiment of the present invention. (b) Sectional view in which the stator pieces of (a) were laminated, insulated, and wound.

FIG. 6 (a) is a sectional view of a stator piece according to a sixth embodiment of the present invention. (b) Sectional view in which the stator pieces of (a) were laminated, insulated, and wound.

FIG. 7 (a) is a sectional view showing a method of punching a stator piece from a bidirectional electromagnetic steel sheet according to a seventh embodiment of the present invention. (b) Sectional view in which the stamped stator pieces of (a) were laminated and bent. (c) Sectional drawing which insulated and wound the stator piece of (b).

FIG. 8 (a) is a sectional view showing a method for punching a stator piece from a bidirectional electromagnetic steel sheet according to an eighth embodiment of the present invention. (b) Sectional view in which the stamped stator pieces of (a) were laminated, insulated, and wound.

FIG. 9 (a) is a sectional view showing a method for punching a stator piece from a bidirectional electromagnetic steel sheet according to Embodiment 9 of the present invention. (b) Sectional view in which the stamped stator pieces of (a) were laminated and bent. (c) Sectional drawing which insulated and wound the stator piece of (b).

FIG. 10 is a sectional view of a rotor according to a sixth embodiment of the present invention.

FIG. 11 is a sectional view of a conventional electric motor.

FIG. 12 is a conceptual diagram of a driving circuit and a driving principle of an electric motor.

FIG. 13 is a magnetic flux diagram of the electric motor.

FIG. 14 is a sectional view of a conventional motor stator.

FIG. 15 is a cross-sectional view of a conventional motor stator core.

FIG. 16 (a) is a cross-sectional view of a conventional motor stator core. (b) Sectional drawing which shows the manufacturing process of a magnetic steel sheet piece. (c) Sectional drawing which shows the manufacturing process of a magnetic steel sheet piece.

FIG. 17 is a sectional view of a conventional rotor.

FIG. 18 is a conceptual diagram showing a compressor, a refrigeration cycle thereof, and a control circuit.

[Explanation of symbols]

1 stator, 2 slots, 3 teeth, 4 windings, 5 rotor shafts, 6 stator pieces, 7 permanent magnets, 8 air gaps, 9 rotors, 10 stator cores, 11 rotor cores, 12 yoke parts, DESCRIPTION OF SYMBOLS 13 Thin connection part, 14 Easy magnetization direction, 15 DC power supply, 16 Drive circuit, 17 Control circuit, 18 Position detector, 19 Magnetic flux, 20 insulator, 2
DESCRIPTION OF SYMBOLS 1 Current, 22 joints, 23 Bidirectional electrical steel sheets, 3
0 motor, 31 compressor.

Continuation of front page (72) Inventor Kazuhiko Baba 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term in Mitsubishi Electric Corporation (Reference) 3H003 AB04 AC03 CE03 CF04 5H002 AA03 AA07 AA09 AB01 AC02 AC08 5H615 AA01 BB01 BB07 BB14 BB16 PP01 PP06 SS03 SS05 SS16 SS19 TT04 TT13

Claims (14)

[Claims] 1. A rotating electric machine comprising: a tooth portion and a yoke portion formed of a directional magnetic steel sheet such that an easy magnetization direction coincides with a flow direction of a magnetic flux flowing through a stator core. 2. The rotating electric machine according to claim 1, wherein the teeth and the yoke are formed by punching out a bidirectional electromagnetic steel sheet. 3. The device according to claim 1, further comprising a thin connecting portion for connecting the teeth portion and the yoke portion.
The rotating electric machine as described. 4. The teeth portion and a yoke portion forming a slot on one side of the teeth portion are made into one piece, and the direction of easy magnetization of the teeth portion and the yoke portion is determined by the direction of the magnetic flux flowing through the stator core. A rotating electric machine characterized by being formed from a bidirectional magnetic steel sheet so as to match. 5. The rotating electric machine according to claim 4, further comprising a thin connecting portion that connects the yoke portion forming the slot on the other side of the tooth portion and the tooth portion. 6. The rotating electric machine according to claim 1, wherein the yoke portion is continuous between the teeth portions. 7. The yoke portion according to claim 1, wherein the yoke portion is divided such that a portion near a boundary of the winding group in the slot is a joint portion on the side of the yoke portions facing the slot. The rotating electric machine according to item 1. 8. The rotating electric machine according to claim 1, further comprising a thin connecting portion which is connected in parallel to the yoke portions and can be bent and formed on the cylindrical stator. 9. A teeth portion, a teeth tip protruding from the teeth portion in the direction of rotor rotation, and a thin connecting portion connecting the teeth portion and the teeth tip portion, wherein the teeth portion and the teeth tip portion are provided. A rotating electrical machine formed from a grain-oriented electrical steel sheet such that the direction of easy magnetization substantially coincides with the direction of flow of magnetic flux flowing through the stator core. 10. The rotating electric machine according to claim 1, wherein the stator has a concentrated winding of 9 slots. 11. A rotor of a rotating electric machine including a core body made of a laminated steel sheet made of a bidirectional magnetic steel sheet, and a permanent magnet embedded in the core body, wherein the direction of easy magnetization in the core body is A rotating electrical machine configured to match the directions of an N pole and an S pole of the permanent magnet. 12. A compressor using the rotating electric machine according to claim 1 as an electric motor. 13. A method for manufacturing a rotating electric machine, wherein a tooth portion and a yoke portion are punched and formed from a bidirectional electromagnetic steel sheet so that an easy magnetization direction coincides with a flow direction of a magnetic flux flowing through a stator core. 14. The stator pieces are connected in parallel by thin connecting portions,
The teeth and the yoke are punched out of a bidirectional electromagnetic steel sheet so that the direction of easy magnetization substantially matches the flow direction of the magnetic flux flowing through the stator core, and the stator pieces are laminated and bent into a cylindrical shape. The method for manufacturing a rotating electric machine according to claim 13, wherein: