JPS62171447A - Closed type motor-driven compressor - Google Patents

Abstract

PURPOSE:To improve efficiency and reduce consumption power and make a mechanism economical, by using the motor of a permanent magnet type for a driving source. CONSTITUTION:A closed type motor-driven compressor 21 is composed of a compression mechanism section 22 and the synchronized motor 23 of a permanent magnet type in a closed container 24. The synchronized motor 23 of the permanent magnet type consists of a stator 25, the rotor 26 of the permanent magnet type, and a shaft 35, and a permanent magnet 29 is fitted into the rotor 26. A magnetic field contributing to the generation of torque can be fed from the permanent magnet, and so self-excitation as shown by conventional closed type motor-driven compressors is not needed, and efficiency is extremely improved because exciting current loss is not caused.

Description

Detailed Description of the Invention: A container, 3 a compression mechanism section, 4 an induction motor section, 5 a stator, 6 an aluminum die cast rotor, 7 a cylinder, 8 a crankshaft, 9 a roller, 10 a vane, and 11 a Spring, 12 cylinder chamber, 13 upper bearing, 14
is the lower bearing, 15 is the discharge port, 16 is the suction port, 1
7 is a discharge valve, and 18 is a suction valve. In the hermetic electric compressor 1 configured as described above, when an AC voltage is applied to the induction motor 4, the aluminum die-cast rotor 6 starts rotating, and the crankshaft 8, which is interlocked with the aluminum die-cast rotor 6, starts eccentric rotation. Initially, the roller 9 inserted into the crankshaft 8 rotates eccentrically within the cylinder chamber 12 along the inner peripheral surface, and the vane 10, which is pressed by the spring 11 so as to come into contact with the roller 9, rotates the cylinder chamber 12. The inside is divided into two. Therefore, the refrigerant gas from the refrigeration cycle is sucked into the suction boat 1 from the suction tube 18.
6 into the cylinder chamber 12, and is then compressed and pressurized to a predetermined pressure by the eccentric rotation movement of the crankshaft 8 and rollers 9. After that, the discharge valve is pushed open from the discharge boat 13, and the air inside the closed container 2 is sucked into the cylinder chamber 12. It is discharged into space. After that, it passes around the stator 5 and rises, and the discharge valve 17
It is sent out to the outside of the hermetic electric compressor 1 and reaches the inside of the refrigeration cycle. Here, a cooling effect is performed, and the air is sucked into the cylinder chamber 12 again through the suction valve 18, and the same suction-compression->discharge process is repeated in sequence. The hermetic electric compressor 1 having such a function is widely used in electric refrigerators and air conditioners. However, due to recent energy shortages, energy conservation has become an urgent need, and particularly low power consumption has been required. The electric motor used in this hermetic electric compressor is often an induction motor using an aluminum die-cast rotor. In principle, this induction motor generates torque by supplying an excitation current that generates a magnetic field from the windings wound around the stator, so this current causes a lot of loss and is inefficient, making it a consumer of refrigerators and air conditioners. By using a permanent magnet type synchronous motor that uses permanent magnets as the drive source for the hermetic electric compressor, efficiency is improved, power consumption is reduced, and the structure of the motor is essential for making it inexpensive. Since permanent magnets are used for the field, there is no excitation loss like in induction motors, so it was devised to be able to be applied at a low cost, compared to ferrite magnets which are cheaper but have weaker strength. In addition, the method of forming the permanent magnet yoke, the stator core, and the method of fixing the permanent magnets have been developed to realize a hermetic electric compressor that is inexpensive and consumes less power. 22 is a compression mechanism, 23 is a permanent magnet type synchronous motor, 24 is a sealed container, 25 is a stator, 26 is a permanent magnet rotor, 27 is a winding, 28 is a yoke, 2 are permanent magnets, 3
0 is gel adhesive, 31 is aluminum die-casting, 32 is upper balance weight, 33 is lower balance weight, 3
4 is a surface reinforcing member, 35 is a crankshaft, 36 is a narrow diameter portion, 37 is a caulking portion of the yoke 28 and the stator core,
38 is a protrusion of the yoke 28. The yoke 28 is formed by sequentially caulking a laminated plate with caulking parts 37 at a plurality of places as shown in FIG. 5, and can be manufactured in a punching die of a press. was also formed using a similar method. Furthermore, the same number of protrusions 39 as the number of divisions of the permanent magnets 29 are provided on the outer circumference of the yoke 28, and the permanent magnets 29 serve both to prevent slipping and to position the permanent magnets 29 on the outer circumference of the yoke 28.

Then, a side portion 40.4 in which a permanent magnet 29 is positioned in the axial direction by aluminum die-casting on the laminated yoke 28.
1 and at the same time, the upper balance weight 32 is also formed into one body. Furthermore, the lower balance weight 33 is attached as a separate member, two permanent magnets are temporarily fixed on the outer peripheral surface of the yoke 28 using a gel adhesive 30, and the permanent magnet 29 is further fixed on the outer peripheral surface of the permanent magnet 29 using a surface reinforcing member 34. The yoke 28
A permanent magnet rotor is manufactured by firmly fixing the magnet to the outer peripheral surface of the magnet. Thereafter, the stator 25 is fixed to the case 42 of the sealed container 24 by shrink fitting. The permanent magnet rotor 26 is press-fitted into the crankshaft 3.
5 is installed. At this time, by providing a narrow diameter portion 35 at the upper part of the crankshaft 35, the permanent magnet rotor 26
This makes assembly easier. That is, this is effective in preventing bending of the crankshaft 35 due to frictional resistance during press-fitting and in positioning the permanent magnet rotor 26 at the initial stage of press-fitting.

The hermetic electric compressor 21 configured in this manner is operated by applying a voltage controlled by an external circuit. That is, like the conventional hermetic electric compressor 1 described above, it forms a part of the refrigeration cycle, and has the function of sequentially performing the steps of suction → compression → discharge → suction of refrigerant in the refrigeration cycle, and is used in refrigerators and other applications. It can be used in air conditioners. At this time, since the permanent magnet type synchronous motor 23 using a permanent magnet rotor is used as the drive source of the hermetic electric compressor 21,
Since the magnetic field that contributes to torque generation can be supplied by permanent magnets, there is no need for self-excitation like in conventional hermetic electric compressors, so there is no loss due to excitation current, so the efficiency of permanent magnet type synchronous motors is high. As described in detail above, the present invention is a permanent magnet type synchronous motor using permanent magnets with no excitation loss. There is an advantage that the efficiency can be greatly improved by using ferrite magnets, and at the same time, even in devices using ferrite magnets, which are relatively inexpensive but have low strength, reinforcement by guide method from both sides using aluminum die-casting, and permanent reinforcement. Heat shock is alleviated by fixing the magnets with a gel-like adhesive, and a practical hermetic electric compressor using permanent magnets can be provided by fixing the magnets with a surface reinforcing member.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional view of a conventional hermetic electric compressor, Figure 2 is a cross-sectional view taken along line AA in Figure 1, and Figure 3 is a longitudinal cross-section of an embodiment of a hermetic electric compressor. FIG. 4 is a cross-sectional view showing a protruding portion of a yoke, and FIG. 5 is a partial cross-sectional view of an embodiment in which lamination of yokes and stator cores is performed by caulking. 1... Sealed electric compressor, 2... Sealed container, 3...
・Stator, 6... Aluminum die-cast rotor, 7...
・Cylinder, 8... Crankshaft, 9... Roller, 10... Vane, 11... Spring, 12...
...Cylinder chamber, 13...Discharge port, 15...Suction port, 16...Suction valve, 17...Discharge valve, 26...Permanent magnet, 27...Winding, 28...・
Yoke, 29... Permanent magnet, 30... Gel adhesive, 31... Aluminum die casting, 32... Upper balance weight, 33... Lower balance weight, 34.
...Surface reinforcement member. Stem 1 Figure Stem 2 Figure Stem 3 Figure

Claims (1)

[Claims] 1. In a hermetic electric compressor using a permanent magnet synchronous motor as a drive source, the stator of the permanent magnet synchronous motor is fixed to the case of the hermetic container by shrink fitting, and the permanent magnet rotor is Laminated caulking yoke, permanent magnet, aluminum die-casting material,
A hermetic electric compressor comprising a balance weight, a gel adhesive, and a surface reinforcing member, and characterized in that the core laminations of the stator are connected by caulking the laminated plates together. 2. The hermetic electric compressor according to claim 1, wherein a portion of the crankshaft in contact with the laminated caulking yoke is partially reduced in diameter. 3. The hermetic electric compressor according to claim 1, wherein the same number of protrusions as the number of divisions of the permanent magnet are formed on the surface of the magnet yoke, and the protrusions match the chamfered portions of the joints of the permanent magnets.