JPH06323292A - Rotor of motor for compressor - Google Patents

Abstract

PURPOSE:To restrain rotational resistance in liquid as far as possible and prevent efficiently from being reduced in a rotor of a motor for a compressor having a permanent magnet in an iron core of the rotor in a salient-pole structure. CONSTITUTION:The tops of recesses between respective salient-poles are bound by a thin bridge 25 to provide closed spaces 22 in rotor iron cores constituted to be laminated. Also, a caulking pin for sticking upper and lower non-magnetic end face members integrally to the rotor iron cores is adapted to pass through the closed space in the rotor iron cores. Further, in place of the tops of recesses between the salient-poles bound by the thin bridge, the recesses may be embedded with a non-magnetic caulking pin and a non-magnetic filler integrally extending through the upper and lower non-magnetic end face members and rotor iron cores.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of a compressor electric motor, and more particularly to a rotor of a compressor DC brushless electric motor having a salient pole structure and having a permanent magnet material in a rotor core.

[0002]

2. Description of the Related Art A rotor of a conventional compressor electric motor includes, for example, a first conventional example shown in FIG.
Japanese Unexamined Patent Publication No. 185247/1992, which is shown in FIG. 7 as a second conventional example.
As shown in FIG. 6, the first conventional example is a squirrel-cage salient magnet structure rotor in which the outer peripheral portion of the rotor core is cut between the magnetic poles of the salient pole portions to prevent magnetic pole short circuits. 1 is a shaft, 2 and 3 are partial iron cores, and 4 is a non-magnetic intermediate plate. As shown in FIG. 7, the second conventional example is a salient pole structure rotor having slots on the outer peripheral portion. 5 is an eccentric shaft, 6
Is a yoke, 6a is a slot, and 7 is a permanent magnet. or,
The third conventional example has a pair of permanent magnets 7 shown in FIG.
As shown in FIG. 8, two pairs of permanent magnets 8 are provided.

[0003]

However, the first conventional example shown in FIG. 6 and the second conventional example shown in FIG. 7 have a core cut portion on the outer peripheral portion of the rotor, so that the motor for a compressor is In the case of the rotor, there is a problem in that the liquid mixture of the refrigerant and the oil present inside is agitated, and as a result, a great amount of rotational resistance is received, especially at high speed rotation, resulting in a decrease in efficiency. Further, conventionally, there is a problem that a magnetic loss due to the existence of the hole is large because a hole through which the caulking pin for fixing the yoke side plate of the rotor is integrally formed is required in a part of the core. Further, the third conventional example shown in FIG. 8 has the following problems. The rivet caulking only on the inner peripheral portion or the outer peripheral portion of the core is insufficient in the caulking strength of the rotor. The rivet caulking only on the inner peripheral portion is insufficient to suppress the outer peripheral portion, and the larger the caulking strength of the inner peripheral portion, the more the outer peripheral portion tends to expand in the stacking direction. Only the outer peripheral portion will be caulked outside the core, and the caulking pressure of the core itself will be insufficient, and only the upper and lower side plates will be clamped and deformed.

[0004]

The present invention takes the following means in order to solve the above problems. The notch existing between the magnetic poles of the rotor core having a salient pole structure has a closed shape to suppress the rotational resistance. The caulking pin that integrally fixes the rotor iron core and the end face member is inserted through the closed space of. The concave portion on the outer circumference of the rotor is filled with a non-magnetic caulking pin or a non-magnetic filling material.

[0005]

The magnetic short circuit between the poles which may be caused by connecting the tops of the concave portions between the rotor salient pole portions with a thin wall bridge can be suppressed. Further, the rivet crimping pin can be passed through the space.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a rotor of a compressor electric motor according to the present invention will be described below with reference to FIGS. Figure 1
2 shows a first embodiment corresponding to the first invention, FIG. 3 shows a second embodiment corresponding to the second invention, and FIG. 4 shows a third embodiment corresponding to the third invention. 5 shows the fourth embodiment. First Embodiment FIG. 1 is a vertical sectional front view of a compressor in which a first embodiment of a rotor of a compressor electric motor is incorporated, and FIG. 2A shows a rotor of an electric motor included in the compressor of FIG. Partial sectional front view, FIG.
FIG. 2B is a plan view of the rotor shown in FIG. In FIG. 1, 11 is a closed container, and the electric motor 1 is provided on the upper side inside.
2. A compression element 13 rotatably driven by an electric motor 12 is housed on the lower side. The electric motor 12 includes a stator 14 fixed to the inner wall of the closed casing 11 and a rotary shaft 1 inside the stator 14.
6 and a rotor 15 rotatably supported. The stator 14 is provided with a stator winding 17 that gives a rotating magnetic field to the rotor 15. As the rotor 15, a 0.5 mm thick rotor core (electromagnetic steel plate) punched into a predetermined shape is used. The rotor cores are crimped to each other and integrally formed (or integrally formed by welding). In FIG. 2, reference numeral 21 denotes a salient pole structure in a compressor in which a compression element and an electric motor for rotationally driving the compression element are housed in a single closed container, and the rotation of the compressor electric motor having a permanent magnet material in the rotor core. Child 1
The rotor core of No. 5 is a space 22 having a closed shape in which the tops of the recesses between the salient poles are connected by a thin bridge 25.
The rotor core provided with is laminated. Two
Reference numeral 2 denotes a space, which is formed in the rotor core 21 along the axial direction. Reference numeral 23 is a first end surface member attached to one end of the rotor core 21, and 24 is a second end surface member attached to the other end of the rotor core 21. 26 is a permanent magnet. Second Embodiment FIG. 3 is a plan view of a second embodiment of the rotor of the compressor electric motor. In FIG. 3, reference numeral 31 denotes a rotor of a compressor electric motor in a compressor in which a compression element and an electric motor for rotationally driving the compression element are housed in a single closed container.
Space 33 of the closed shape of the rotor core 32 similar to (B)
A non-magnetic upper and lower end surface member (not shown) and a rotor core 32
And the caulking pin 34 for integrally fixing and. Third Embodiment FIG. 4 is a view for explaining a third embodiment of the rotor of the compressor electric motor, and (A) is a plan view in which the upper and lower end face members and the integral caulking pins are passed through the outer peripheral recesses of the rotor core. Figure, (B) is a plan view in which (A) is filled with a non-magnetic filler, (C) is filled with non-magnetic filler in the outer peripheral recess of the rotor core, and the upper and lower end face members and the rotor core are integrated. It is a top view at the time of providing a caulking hole for caulking. In FIG. 4, reference numeral 41 denotes a rotor of a compressor electric motor in a compressor in which a compression element and an electric motor for rotationally driving the compression element are housed in a single hermetic container, and a recess 42 between the salient pole portions is shown. Instead of connecting the top portion of the with a thin-walled bridge, the recess 42 is filled with a non-magnetic caulking pin 43 and a non-magnetic filling material 44 that integrally penetrate the non-magnetic upper and lower end surface members and the rotor core. It is a thing. Reference numeral 45 in FIG. 4 (C) is a caulking hole. Fourth Embodiment FIG. 5 is a plan view of a fourth embodiment of the rotor of the compressor electric motor. In FIG. 5, reference numeral 51 denotes a rotor of a compressor electric motor in a compressor in which a compression element and an electric motor for rotationally driving the compression element are housed in a single closed container, and the rotor as shown in FIG. Further, the inner peripheral portion of the rotor core is crimped to 31 by crimping pins 52.

[0007]

Since the rotor of the compressor electric motor according to the present invention is configured as described above, it has the following effects. According to the first invention of claim 1, the salient-pole structure rotor does not have a notch in the outer peripheral portion, so that the rotational resistance when rotating in a liquid like a compressor electric motor is suppressed as much as possible. . In that case, since the notch is connected by a thin wall bridge, magnetic short circuit between magnetic poles can be ignored. According to the second invention of claim 2, since the caulking pin for integrally fixing the end face member and the rotor iron core is inserted into the space closed by the notch, the rotor iron core has a hole for penetrating the caulking pin. It becomes unnecessary, and the magnetic resistance and iron loss are reduced accordingly, and the efficiency of the electric motor can be improved. According to a third aspect of the present invention, instead of connecting the tops of the recesses between the salient poles with a thin-walled bridge, the recesses are formed by integrating the non-magnetic upper and lower end surface members and the rotor core. Since the nonmagnetic caulking pin that penetrates and the nonmagnetic filling material are used for filling, the rotor core does not need a hole for penetrating the caulking pin, and the magnetic resistance and iron loss are reduced accordingly.
It is possible to improve the efficiency of the electric motor.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of a compressor incorporating a first embodiment of a rotor of a compressor electric motor according to the present invention.

2A is a partial cross-sectional front view of a rotor of an electric motor included in the compressor of FIG. 1, and FIG. 2B is a plan view of the rotor of FIG.

FIG. 3 is a plan view of a second embodiment of the rotor of the compressor electric motor according to the present invention.

FIG. 4 is a view for explaining the third embodiment of the rotor of the compressor electric motor according to the present invention, in which (A) shows a caulking pin integral with the upper and lower end face members in the outer peripheral recess of the rotor core. A plan view, (B) is a plan view in which (A) is filled with a non-magnetic filler, (C) is filled with a non-magnetic filler in the outer peripheral recess of the rotor core, and the upper and lower end face members and the rotor core are integrated. It is a top view at the time of providing a caulking hole for caulking.

FIG. 5 is a plan view of a fourth embodiment of the rotor of the compressor electric motor according to the present invention.

FIG. 6 is a perspective view of a first conventional example of a rotor of a permanent magnet type rotating electrical machine disclosed in Japanese Patent Publication No. 49-33482.

FIG. 7 is an exploded perspective view of a second conventional example of the rotor of the compressor electric motor disclosed in Japanese Patent Laid-Open No. 4-185247.

FIG. 8 is a plan view of a third conventional example of a rotor core.

[Explanation of symbols]

 11 Airtight Container 12 Electric Motor 13 Compressor 14 Stator 15 Rotor 16 Rotating Shaft 17 Stator Winding 21 Rotor Iron Core 22 Space 23, 24 End Face Member 25 Bridge 26 Permanent Magnet 31 Rotor 32 Rotor Iron Core 33 Space 34 Caulking Pin 41 rotor 42 recess 43 caulking pin 44 filler 51 rotor 52 caulking pin

Claims (3)

[Claims] 1. A rotor of a compressor electric motor having a salient pole structure and having a permanent magnet in a rotor iron core, which has a shape in which the tops of the recesses between the salient poles are closed by a thin bridge. A rotor for an electric motor for a compressor, which is formed by laminating rotor cores provided with spaces. 2. The rotor for a compressor electric motor according to claim 1, wherein the non-magnetic upper and lower end surface members and the rotor core are integrally fixed to each other in a closed space of the rotor core. A rotor of an electric motor for a compressor characterized by passing through a pin. 3. A rotor of a compressor electric motor having a salient pole structure and having a permanent magnet in a rotor core, instead of connecting the tops of the recesses between the salient poles with a thin wall bridge. A rotor for a compressor electric motor, characterized in that a non-magnetic upper and lower end face member and a non-magnetic caulking pin integrally penetrating the rotor core and a non-magnetic filler are embedded.