JPS5911747A - Sealed motor-driven compressor - Google Patents

Abstract

PURPOSE:To improve the efficiency of a motor-driven compressor and to reduce the power consumption of the compressor by using a permanent magnet type synchronous motor which employs a permanent magnet as a drive source. CONSTITUTION:A side is formed on a yoke 28, and a permanent magnet 29 is axially disposed in this manner. An upper balance weight 31 is integrally formed. Further, a lower balance weight 32 is mounted with another member, the magnet 29 is matched to be affixed to the outer peripheral surface of the yoke 28 via a surface reinforcing member 33, thereby manufacturing a permanent magnet rotor 26. A stator 25 is secured by shrink-fitting to the case 40 of a sealed container 24. The magnet 26 is mounted by press-fitting on a crankshaft 34. A sealed motor-driven compressor 21 thus constructed is operated by applying a voltage controlled by an external circuit thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive unit for a hermetic electric compressor.

A conventional hermetic electric compressor will be explained with reference to FIG. 1 and FIGS. 0 and 2. 1 is a hermetic electric compressor, 2 is a hermetic container, and 3
is the compression mechanism part, 4 is the induction motor part, 5 is the stator, 6 is the aluminum tie cast "1-ta, 7t: 1, / ring, 8 is the crank/gift, 9 is the roller, 10 is the hone, IIIJ gooseberry/ 12 is a / link chamber, 13 is an upper bearing, 14 is a lower bearing, 15 is a discharge port 1-116 is a suction boat, 17 is a discharge pine, and 18 is a suction pipe. In the electric compressor 1, when an AC voltage is applied to the induction motor 4, the aluminum die cast rotor starts turning 111J, and the crankshaft 8, which is linked to this aluminum die cast rotor 6, starts eccentric rotation, and this crank /A roller 9 inserted into the yaf l-8 rotates eccentrically along the inner peripheral surface within the cylinder chamber 12, and the base 10, which is pressed by a spring 11 so as to come into contact with this roller 9, / Inside the cylinder chamber 12 there are 2
divided. Therefore, the refrigerant residue from the refrigeration cycle is transferred from the suction vibrator 18 to the suction boat 16 to the cylinder chamber]2
1. After pressurizing to a predetermined pressure, the discharge valve is pushed open from the discharge hoard 13, and the discharge is discharged into the airtight container 2 between 2) and 5. Then stator 5
It passes around the periphery of the electric compressor 1 and is sent out from the hermetic electric compressor 1 through the +l output vibrator 17 and reaches the inside of the refrigeration cycle. Cooling action is performed here and
7 cylinder chambers 12, and the same suction-compression-exhalation process is repeated one after another. The hermetic electric compressor 1 having such a function is widely used in electric refrigerators and air conditioners. However, due to the recent labor shortage, power saving has become an urgent need, and particularly low power consumption has been required. The motor used in this hermetic electric compressor is often an induction motor using an aluminum die-cast rotor. In principle, the induction motor generates torque by supplying an excitation fl)', which generates a magnetic field, from the windings wound around the stator.

Because of this, there is a lot of loss due to this current, resulting in poor efficiency and high power consumption for refrigerators and air conditioners.

The present invention is an attempt to improve such drawbacks, and uses permanent magnets in the electric motor that is the drive source of the hermetic electric compressor.
By using this permanent magnet type synchronous motor, efficiency was improved and power consumption was reduced, and a method of manufacturing the motor structure at low cost was also developed.

The present invention has been devised to be able to be applied at a low cost from the viewpoint that permanent magnet type synchronous motors use permanent magnets for the field magnet that is essential for torque generation, and there is no loss of excitation + i as with induction motors. This was done to apply the two-light (i+, 'G) stone, which is inexpensive but has low strength, and has been used in a variety of ways, including the method of forming the permanent magnet yoke, the stator core, and the method of connecting it to the compression mechanism. The aim is to realize a hermetic electric compressor that is inexpensive and consumes little electricity.

1. The present invention will be explained with reference to FIGS. 3 to 6. 21 is a sealed electric compressor according to an embodiment of the present invention; 22
is a compression mechanism section, 23 is a permanent magnet size 1J] electric motor, 24
is a sealed container, 25 is a stator, 26 is a permanent magnet rotor,
27 is a winding, 28 is a yoke, 29 is a permanent magnet, 30 is an aluminum die-casting, 31 is an upper balance weight, 32 is a lower run weight, 33 is a table 1n1 reinforcement portion, 3
4 is the crank, 35 is the small diameter part, 36 is the force of the yoke 28 and stator core, 77 parts, 37 is the yoke 28
This is the protrusion. As shown in Fig. 5, the cork 28 is formed by sequentially caulking a laminated plate by applying force of 77 parts to several parts of the rice, and can be manufactured in a punching die of a press. was also formed using a similar method. On the outer periphery of the yoke 28, the same number of protrusions 37 as the number of divisions of the permanent magnet 329 are provided, which serve both to prevent the permanent magnet 29 from idling on the outer periphery of the yoke 28 and to determine the position. It is something. And permanent 4+7 by aluminum tie-casting on the laminated yoke 28! t
, the side part 38 where the stone 29 is displaced in the axial direction. , 39 are provided, and at the same time, the upper balance weight 31 is also formed into one body.

Furthermore, the lower balance weight 32 is taken out as a separate part, and the permanent magnet 29 is aligned with the surface reinforcing part 4. The permanent magnet rotor 26 is manufactured by fixing the permanent magnet 29 onto the outer peripheral surface of the yoke 28 using J3'3.

After that, the stator 25 is fixed to the case 40 of the airtight container 24 by shrinkage fit! 1. Ru. Then permanent magnet rotor 2
6 is attached to the crankshaft 34 by press fitting. The permanent magnet rotor 26 can be easily assembled by providing 35 small-diameter portions on the negative side of the DJ crank 7. In other words, the crankshaft due to frictional resistance during press-fitting
Preventing bending of foot 34 and permanent magnet yoke 2 during initial press-fitting
This is effective for positioning No. 6. Like this, it's hard and 4'l'i
The hermetic electric compressor 21 thus constructed is operated by an external circuit.
In other words, like the conventional hermetic electric compressor 1 described above, it forms a part of the refrigeration cycle and is operated by applying a controlled voltage.
・Discharge -) Inhalation... Demonstrates the function of sequentially performing the strokes,
It can be used as a refrigerator or an air conditioner. At this time, a permanent magnet is used as a driving source for the closed electric pF compressor 21.
Since the permanent magnet type synchronous motor 23 uses a permanent magnet, the magnetic field that contributes to torque generation can be supplied from the permanent magnet, so it is not a conventional sealed type synchronous motor. Since it does not require self-excitation like a dynamic compressor, there is no loss of power due to the excitation 1% current, so the efficiency of the permanent magnet type I synchronous motor is high.
When used in air refrigeration or air conditioners, it has the effect of reducing power consumption by as much as 11 degrees.

As described in detail above, the present invention has the advantage of being able to improve efficiency by using a permanent magnet type synchronous motor using permanent magnets with low excitation power and loss of power. Although it is relatively inexpensive, it is weak in strength). Even when attaching the light magnet, we use a practical permanent magnet by using aluminum die-casting to strengthen the sleeves by using the kite method from both sides, and by reinforcing it by removing the surface reinforcement part. It can supply hermetic electric compressors.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a conventional hermetic electric compressor, Fig. 2 is a sectional view taken along line 8 in Fig. 1, and Fig. 3 is a sectional view of a conventional hermetic electric compressor. A vertical cross-sectional view of the compressor, Figure 4 is a cross-sectional view that does not show the protrusion of the yoke, Figure 5 &1: :l-ri-no-1
1. jJt of i11 layer and data core, N (1ka7
Main 7-'? r) In the case of - - Cross-sectional part 1 of the example [C exists. Explanation of symbols 1... Sealed electric IEi compressor 2... Sealed container 5 Data 6... Aluminum die-cast rj-turn 7 cylinder 8... Crank/yaft 9 ``1-ra 1゜be 711 Spring 12.../linda Chamber 13/Discharge boat 15 Suction boat 1/]6/Suction vibe 17
・・・Discharge pipe 26・Permanent magnet 1"1-ta 27・
Winding wire 28 Yoke 294 Permanent magnet 30... Aluminum die cast) 31... Upper balance weight 3
2 Balance weight of the do part 33...Surface reinforcement part removed. Figure l Figure 2 Figure 6 Figure 4 Figure 3 Figure 5 226-

Claims (1)

[Claims] 1. A compression mechanism section and a permanent magnet type synchronous motor section are arranged in a sealed container, and a stator of the permanent magnet type synchronous motor section is fixed to the case of the sealed container by shrinkage fit. , in a hermetically sealed electric compressor in which the permanent magnet rotor of the permanent magnet type synchronous motor section is press-fitted and fixed to the crankshaft, the permanent magnet rotor is made of laminated force/mayor, permanent magnets, aluminum die-casting,
A hermetic electric compressor comprising a balance way and a surface reinforcing part, and characterized in that the core laminations of the stator of the permanent magnet type synchronous motor are connected by a force of 7 force between the laminated plates. 2. The hermetic electric compressor according to claim 1, in which the stacking force of the crank/gift/approximately 1/straddle of the portion in contact with the mayoke is 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.