JP2001008389A - Rotor and motor and motor compressor employing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance motor efficiency by providing means for supplying a current induced in a permanent magnet to an adjacent permanent magnet, thereby utilizing the current effectively as a new force contributive to rotation of a motor. SOLUTION: A rotor 2 of a motor 10 comprises a laminated core 6 of magnetic steel plate coated with a nonmagnetic material, and a permanent magnet 7 buried in the circumferential direction of the core 6. The permanent magnet 7 is press fitted in a permanent magnet hole made in the core 6 while directing the pole in the circumferential direction. Upper and lower end parts 21, 22 are positioned via upper and lower end plates 11, 12 of a nonmagnetic material provided in the rotor 2 and the upper and lower ends of an adjacent permanent magnet 7 are connected by the upper and lower end parts 21, 22, in order to supply a current induced in one permanent magnet to an adjacent permanent magnet 7 through the upper and lower end parts 21, 22, thus preventing eddy current in the permanent magnet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a rotor used for an electric motor or a generator having a magnetic body formed by laminating a plurality of magnetic plates and a permanent magnet embedded in the laminated magnetic body. It is effective when applied. The present invention is also effective when applied to an electric motor using the rotor and an electric compressor using the electric motor.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show motors used in a conventional electric compressor. FIG. 3 is a longitudinal sectional view taken along line CC of FIG. 4, and FIG. 4 is a transverse sectional view taken along line DD of FIG.

In general, a motor 10 is fixed to a main body via a housing (not shown), and a stator 1 installed outside the motor 10 and an inner side of the stator 1. Since the stator 1 is fixed to the main body through the housing, the stator 1 has a rotor 2 that rotates (with respect to the main body as a result). The stator 1 of the electric motor 10 includes a cylindrical core 3 formed by laminating a large number of thin magnetic steel plates made of a conductive material, and a plurality of slots 4 provided at predetermined intervals in a circumferential direction on an inner peripheral wall thereof. , And a large number of electric wires 5 are wound around the slot 4.

The rotor 2 of the electric motor 10 has an iron core 6 formed by laminating a large number of thin magnetic steel sheets having both surfaces coated with a nonmagnetic material at a predetermined interval in the circumferential direction of the iron core 6. And a plurality (four in this figure) of permanent magnets 7 embedded therein. The permanent magnet 7 is press-fitted into a permanent magnet hole 9 provided in the iron core 6, and its magnetic pole is directed in the circumferential direction. Further, a rotor rotating shaft 8 is fixed through the center of the iron core 6, and rivets 13 are inserted around the rotor rotating shaft 8 in the same number as the plurality of permanent magnets. An upper end plate 11 and a lower end plate 12 made of a non-magnetic material are provided at the upper and lower ends of the rotor 2, and the upper end plate 11, the iron core 6, the permanent magnet 7, and the lower end plate 12 of the rotor are fixed by the rivets 13. It is configured.

In the above description, the rotor 2 applied to the electric motor 10 has been described. The electric motor and the generator are driven by supplying electric power to the electric motor. Is driven by the supply of power to generate electric power. Since the usage is reversed but the configuration is the same, the rotor having the same configuration as described above is also applied to the generator.

FIG. 5 is a sectional view of a scroll type electric compressor 31 mainly used for an air conditioner. In FIG. 5, the electric motor 10 is installed in a middle part of the housing 35 of the compressor 31. An orbiting scroll 32 supported by a support member 36 fixed to a housing 35 is provided above the rotor rotation shaft 8 of the electric motor 10.
A fixed scroll 33 meshing with the orbiting scroll 32 is provided to constitute a compression mechanism. The orbiting scroll 32 orbits the refrigerant sucked between the two scrolls. The compressed and compressed refrigerant pushes up the valve 34 and is discharged.

In the above-described conventional electric motor 10, the electric motor 1
Numeral 0 generates torque by using an attractive force of a rotating magnetic field formed by flowing a current through the electric wire 5 of the stator 1 and a magnetic force of the permanent magnet 7. At this time, a current is generated inside the permanent magnet 7 by the rotating magnetic field, but the magnetic steel plate forming the iron core 6 has both sides of the plate coated with a non-magnetic material,
Further, since the upper end plate 11 and the lower end plate 12 are formed of a non-magnetic material, the current cannot pass through the adjacent permanent magnet 7.

[0008]

Therefore, the permanent magnet 7
The current induced in the motor causes an eddy current loss without contributing to the generation of a force (torque) for rotating the motor 10, and as a result, there is a problem that power consumption is increased and motor efficiency is reduced.

Further, in the scroll-type electric compressor 31 shown in FIG. 5, since the compression efficiency is affected by the efficiency of the electric motor 10, there is a problem that the inefficient electric motor cannot compress the refrigerant efficiently. Was.

In view of the above circumstances, the present invention improves the efficiency of the motor 10 by effectively utilizing the current induced in the permanent magnet 7 as a new force (torque) contributing to the rotation of the motor 10. With the goal. Still another object is to provide an electric compressor 31 having improved compression efficiency by using a high-efficiency electric motor 10.

[0011]

SUMMARY OF THE INVENTION The gist of the first invention is that a magnetic body is formed by laminating a plurality of magnetic body plates, both surfaces of which are coated with a non-magnetic material, and embedded in the magnetic body. In a rotor used for an electric motor or a generator having a plurality of permanent magnets, a means for causing a current induced inside the permanent magnet to flow to an adjacent permanent magnet is provided. The gist of the second invention is that the means is provided on at least one end of the rotor via an end plate made of a non-magnetic material, and is a conductive material member connecting at least one end of the adjacent permanent magnet. Consists of

[0013] The gist of the third invention is that a magnetic body in which a plurality of magnetic plates covered on both sides with a non-magnetic material is laminated, and a plurality of permanent magnets embedded in the magnetic body. In a motor having a rotor having a rotor rotatably disposed therein, a means for causing a current induced inside the permanent magnet to flow to an adjacent permanent magnet is provided in the rotor.

According to a fourth aspect of the present invention, there is provided a compressor driven by an electric motor, wherein the electric motor is formed by stacking a plurality of magnetic plates having both surfaces coated with a non-magnetic material. And a rotor comprising a plurality of permanent magnets embedded in the magnetic body, wherein the motor is provided with means for allowing the current induced inside the permanent magnets to flow to adjacent permanent magnets in the rotor. .

[0014]

1 and 2 show an embodiment of the present invention, and show an electric motor 10 used for an electric compressor 31 shown in FIG. FIG. 1 is a longitudinal sectional view taken along line AA of FIG. 2, and FIG. 2 is a transverse sectional view taken along line BB of FIG. Regarding the reference numbers of the respective constituent elements, the same reference numerals are used for the constituent elements common to the conventional technology.

As in the prior art, the motor 10 is fixed to the main body via a housing (not shown).
It has a stator 1 installed inside and outside, and a rotor 2 installed inside the stator 1 and rotating with respect to the stator 1. The stator 1 of the electric motor 10 includes a cylindrical core 3 formed by laminating a large number of thin magnetic steel plates as conductive materials;
A plurality of slots 4 are provided on the inner peripheral wall at predetermined intervals in the circumferential direction, and a large number of electric wires 5 are wound around the slots 4.

The rotor 2 of the electric motor 10 has an iron core 6 formed by laminating a large number of thin magnetic steel sheets whose both surfaces are coated with a non-magnetic material at a predetermined interval in the circumferential direction of the iron core 6. And a plurality (four in this figure) of permanent magnets 7 embedded therein. The permanent magnet 7 is press-fitted into a permanent magnet hole 9 provided in the iron core 6, and its magnetic pole is directed in the circumferential direction. Further, a rotor rotating shaft 8 is fixed through the center of the iron core 6, and rivets 13 are inserted around the rotor rotating shaft 8 in the same number as the plurality of permanent magnets. An upper end plate 11 and a lower end plate 12 made of a nonmagnetic material are provided at the upper and lower ends of the rotor 2, and the upper end plate 11 and the lower end plate 12 pass through the rotor shaft 8, the rivet 13, and the permanent magnet 7. Holes 23a, 23b, 23c, 24a, 24
b, 24c are drilled.

Further, an upper part 21 and a lower part 22 made of a conductive material are disposed outside the upper end plate 11 and the lower end plate 12, and adjacent upper parts 21c and 24c protruding from the through holes 23c and 24c of the upper end plate 21 and the lower end plate 22. The upper and lower ends of the permanent magnet 7 are connected. The rivet 13 is used to connect the upper and lower parts 21 and 22 to the upper and lower ends of the metal permanent magnet 7.
Iron core 6, permanent magnet 7, upper component 21, upper plate 1
1, the lower end component 22 and the lower end plate 12 are fixed.

Here, the conductive material constituting the upper component 21 and the lower component 22 is typically iron,
Other conductor materials may be used, and copper, silver, aluminum and the like can of course be used.

Further, in the present embodiment, the configuration in which the conductive material is provided at both the upper and lower ends is because the effect of the present invention is more remarkable when the conductive material members are provided at both the upper and lower ends. The effect of the present invention can be obtained even if the conductive material member is provided only on one of the ends. Similarly, for the thickness of the conductive material member,
The present invention is not limited thereto, and should be appropriately selected.

As described above, the upper end plate 11 and the lower end plate 1 made of a non-magnetic material are provided at the upper and lower ends of the rotor 2.
Upper and lower parts 21 and 22 made of a conductive material are arranged on the upper and lower ends of the rotor 2 via the upper and lower ends 2, and the upper and lower ends of the adjacent permanent magnets 7 are connected by the upper and lower parts 21 and 22. As a result, the current induced inside one permanent magnet can flow to the adjacent permanent magnet 7 through the upper component 21 and the lower component 22. The rotor 2 has
Since 2n permanent magnets 7 are inserted, a reverse current flows from the permanent magnets 7 corresponding to the adjacent magnetic poles, and as a result, a current can flow in one direction.

That is, by passing the current induced by the permanent magnet 7 to the adjacent permanent magnet 7, an inductive new rotating magnetic field can be generated, which can contribute to the rotating force of the electric motor. As a result, the generated torque increases in comparison with the supplied current value, so that the supplied current value can be reduced for the same torque, and a highly efficient electric motor can be realized.

In the present invention, the sectional shape of the rotor is not limited to the one shown in this embodiment. In this embodiment, a scroll compressor is used as the electric compressor, but the present invention is not limited to this.

[0023]

According to the first aspect of the present invention, the current induced inside the permanent magnet can flow to the adjacent permanent magnet, and eddy current loss in the permanent magnet can be prevented.

According to the second aspect of the present invention, the current induced inside the permanent magnet is provided by providing the conductive material member so that at least one end of the metal permanent magnet is in close contact with the outside of the upper end plate and the lower end plate. Can easily flow to the adjacent permanent magnet, and eddy current loss in the permanent magnet can be prevented.

According to the third aspect of the present invention, the current induced by the permanent magnet can be passed to the adjacent magnet, and the ineffective component which has not contributed to the generation of torque at all in the conventional motor can be effectively used. By generating new torque, a highly efficient electric motor can be realized.

According to the fourth aspect of the present invention, it is possible to allow the current induced by the permanent magnet to pass to the adjacent magnet, and to use the ineffective component which has not contributed to the generation of torque at all in the conventional motor. In this case, a new torque can be generated and a high-efficiency electric motor can be realized. When this is applied to an electric compressor, an electric compressor having high compression efficiency can be realized.

[Brief description of the drawings]

FIG. 1 is a view showing a vertical sectional view of an electric motor according to an embodiment of the present invention.

FIG. 2 is a diagram showing a cross-sectional view of the electric motor according to the embodiment of the present invention.

FIG. 3 is a vertical sectional view of a conventional electric motor.

FIG. 4 is a cross-sectional view of a conventional electric motor.

FIG. 5 is a cross-sectional view of a scroll-type electric compressor using a conventional electric motor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Stator 2 Rotor 3 Cylindrical core 4 Slot 5 Electric wire 6 Iron core 7 Permanent magnet 8 Rotor rotating shaft 9 Permanent magnet hole 10 Motor 11 Upper end plate 12 Lower end plate 13 Rivets 21 Upper end part 22 Lower end part 23a, 23b, 23c, 24a , 24b, 24c Through-hole 31 Compressor 32 Rotary scroll 33 Fixed scroll 34 Valve 35 Housing 36 Support member

Claims (4)

[Claims] 1. A motor or a generator having a magnetic body in which a plurality of magnetic plates, both surfaces of which are coated with a non-magnetic material, are laminated, and a plurality of permanent magnets embedded in the magnetic body. A rotor provided with means for flowing a current induced inside the permanent magnet to an adjacent permanent magnet. 2. The apparatus according to claim 1, wherein said means is provided on at least one end of the rotor via an end plate made of a non-magnetic material, and is made of a conductive material member connecting at least one end of the adjacent permanent magnet. The rotor according to claim 1, wherein: 3. A rotor having a magnetic body formed by laminating a plurality of magnetic plates, both surfaces of which are coated with a non-magnetic material, and a plurality of permanent magnets embedded in the magnetic body, are rotatable inside. Wherein the motor is provided with means for causing a current induced inside the permanent magnet to flow to an adjacent permanent magnet. 4. A compressor driven by an electric motor, wherein the electric motor includes a magnetic body formed by stacking a plurality of magnetic plates, both surfaces of which are coated with a non-magnetic material, and the motor is embedded in the magnetic body. A rotor comprising a plurality of permanent magnets,
An electric compressor, wherein the rotor is provided with means for flowing a current induced inside the permanent magnet to an adjacent permanent magnet.