JP2009240146A - Rotor of brushless dc motor, compressor equipped with rotor, and apparatus with compressor mounted thereon - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the rotor of a brushless DC motor for compressor at a low price with high assembling accuracy. <P>SOLUTION: The rotor of the brushless DC motor includes a laminated iron core 1 of a plurality of thin iron plates, an endplate 3 with permanent magnets 2 embedded into a plurality of holes in the laminated iron core 1 so as to prevent the permanent magnets 2 from jumping out, a refrigerant guide 8 to separate a refrigerant from a refrigerant oil inside the compressor, and a balance weight 5 at the side where the compressor is not mounted for operation. These components are fixedly mounted with a plurality of rivets 7. The refrigerant guide 8 is integrated with the balance weight 6 at the side where the compressor is mounted for operation in the rotor. The rotor is manufactured at the low price with high accuracy in size, and in particular useful to the purpose of the compressor mounted on an air-conditioning apparatus, a refrigerator and a water heater. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotor of a brushless DC motor, a compressor provided with the rotor, and a device equipped with the compressor. In particular, the present invention relates to a rotor of a brushless DC motor incorporated in a compressor mounted on, for example, an air conditioner, a refrigeration device, or a hot water supply device.

  As a motor for driving a compressor mounted in an air conditioner, a refrigerator, a water heater, etc., a brushless DC motor having higher efficiency than an induction motor has been used in recent years with energy saving of the main body. . The brushless DC motor for a compressor is mounted on, for example, a scroll compressor having high efficiency and low noise. However, the cost of the brushless DC motor for the compressor is required to be reduced as the price of the main body decreases. The

  A brushless DC motor mounted on a conventional compressor of this type has a motor structure described in Patent Document 1, for example. A rotor of this type of brushless DC motor will be described with reference to FIGS.

  9 is a structural cross-sectional view of a rotor of a brushless DC motor for a compressor of Conventional Example 1, FIG. 10 is a structural cross-sectional view of the rotor of the brushless DC motor for a compressor shown in FIG. FIG. 11 is an enlarged view of part C in the structural cross-sectional view of the rotor of the brushless DC motor for a compressor shown in FIG.

9 and 10, the laminated iron core 101 is formed by laminating a plurality of thin steel plates. The laminated iron core 101 is provided with four rectangular holes, and permanent magnets 102 are embedded in the respective holes. An end plate 103 for preventing the permanent magnet 102 from jumping out is disposed on the end surface of the laminated core 101 on the side opposite to the compressor mechanism. Further, the compressor counter-mechanism side balance weight 105, the refrigerant guide 104 for the purpose of separating the refrigerant and the refrigerating machine oil in the compressor, and the compressor mechanism side balance weight 106 are fixed by four rivets 107, and the rotor is fixed. Is formed.
JP 2005-120940 A

  However, the rotor of the brushless DC motor for a compressor according to the conventional example 1 requires not only an assembly process due to the large number of parts in the above structure, but also requires dimensional accuracy for each part, which is a cost. It was one of the factors of up. That is, for example, if the hole pitch, hole diameter, or the like into which the rivet 107 is inserted deviates from a suitable range, there is a case where the vibration of the rotor increases and causes a large noise and vibration in the compressor.

  In FIG. 11, if the pressing accuracy of the R dimension (roundness) of the refrigerant guide 104 is poor, the mechanical strength of the core pressing at the outer peripheral portion of the laminated core 101 is weakened, and a gap is formed in the laminated core 101, resulting in motor characteristics. It could lead to deterioration and large vibration. Therefore, the unit price of the single refrigerant guide 104 and the cost of the press die are high.

  12 is a structural cross-sectional view of a rotor of a brushless DC motor for a compressor of Conventional Example 2, FIG. 13 is a structural cross-sectional view of the rotor of the brushless DC motor for a compressor shown in FIG. FIG. 14 is an enlarged view of a portion D in the structural sectional view of the rotor of the brushless DC motor for a compressor shown in FIG.

  12 and 13, the laminated iron core 201 is formed by laminating a plurality of thin steel plates. The laminated iron core 201 is provided with four rectangular holes, and permanent magnets 202 are embedded in each hole. An end plate 203 for preventing the permanent magnet 202 from jumping out is disposed on the end surface of the laminated core 201 on the side opposite to the compressor mechanism. Further, the compressor counter-mechanism side balance weight 205, the refrigerant guide 204 for the purpose of separating the refrigerant and the refrigerating machine oil in the compressor, and the compressor mechanism side balance weight 206 are fixed by four rivets 207, and the rotor is fixed. Is formed.

  The difference between the conventional example 2 and the conventional example 1 is that in the conventional example 2, the end plate 203 is inserted into the compressor mechanism side. The thing of the prior art example 2 is a structure used when the press work precision of the R dimension of the refrigerant | coolant guide 204 shown in FIG. 14 is low.

  Further, the reason for inserting the end plate 3 on the compressor mechanism side will be described with reference to the rotor core sheet diagram of the brushless DC motor for compressor shown in FIG. The rotor core sheet diagram shown here is an example, and the core sheet diagram has four types of through holes. The first is four rectangular holes, that is, permanent magnet insertion holes 309. The second is eight holes on the circumference through which refrigerant and refrigerating machine oil pass, that is, refrigerant passage holes 310. The third is four holes for inserting rivets, that is, rivet insertion holes 311. The fourth is a compressor mechanism shaft hole 312 provided at the center of the rotor core sheet.

  In the rotor core used for the compressor, in order to improve the efficiency of the brushless DC motor, it is necessary to dispose the permanent magnet insertion hole 309 as far as possible on the outer peripheral side. Therefore, if the bridge width H shown in FIG. 15 is extremely narrowed, the bridge width portion breaks due to centrifugal force or the bending in the thrust direction occurs at the time of assembly of the rotor at the time of high speed rotation or startup / stop of the brushless DC motor. there is a possibility. For this reason, in FIG. 13, the both ends of the laminated core 201 are overlapped with the end plate 203 and fixed with a plurality of rivets 207 while sandwiching the laminated core 201, thereby breaking the bridge portion during rotation or during assembly. It becomes possible to prevent bending. However, in the structure of the conventional example 2, as in the conventional example 1 shown in FIG. 10, the number of parts is large, so that the number of parts is increased, or the individual part dimensional accuracy is required. It was one. In general, the end plate 203 and the refrigerant guide 204 used inside the compressor are optimally made of stainless steel or the like. However, in recent years, there are concerns about the rise of materials and the availability of high-quality stainless steel overseas. Yes.

  In the conventional configuration, the refrigerant guide 104 or 204 and the mechanism-side balance weight 106 or 206 are used in two types, or the refrigerant guide 104 or 204, the mechanism-side balance weight 106 or 206, and the end plate 103 or 203. It is necessary to fix the parts with rivets 107 and 207. Therefore, the number of parts is large, and individual part dimensional accuracy is required. As a result, there is a problem that the unit cost is high due to the increase in the number of man-hours for assembly or the increase in parts processing cost and the cost of dies due to demand for individual press dimensional accuracy.

  In order to solve the above problems, a rotor of a brushless DC motor for a compressor according to the present invention has the following configuration. That is, a laminated iron core in which a plurality of thin steel plates are laminated, an end plate for embedding permanent magnets in a plurality of holes provided in the laminated iron core to prevent the permanent magnets from jumping out, and refrigerant and refrigerator oil in the compressor. In the rotor in which the refrigerant guide for separation and the compressor counter mechanism side balance weight are fixed by a plurality of rivets, the refrigerant guide and the compressor mechanism side balance weight part are integrated.

  With this configuration, in the rotor of the brushless DC motor for a compressor according to the present invention, the refrigerant guide and the compressor mechanism side balance weight part are integrated, or the refrigerant guide, the compressor mechanism side balance weight part and the end plate are integrated. Thus, the work process can be simplified. Furthermore, an inexpensive brushless DC motor rotor for a compressor that can improve assembly accuracy by reducing the number of parts can be provided.

  Embodiments of the present invention will be described below with reference to the drawings. Specifically, a laminated iron core in which a plurality of thin steel plates are laminated, and an end for providing a plurality of open holes in the laminated iron core, embedding permanent magnets in the open holes, and further preventing the permanent magnets from jumping out. In a rotor in which a plate, a refrigerant guide for the purpose of separating refrigerant and refrigeration oil in a compressor, and a balance weight are fixed by a plurality of rivets, the refrigerant guide of the rotor components and the rotor An embodiment of a rotor of a DC brushless motor for a compressor, which is characterized in that the balance weight and the structure are integrally formed will be described below.

  FIG. 1 is a structural cross-sectional view of a rotor of a brushless DC motor in Embodiment 1 of the present invention, FIG. 2 is a structural cross-sectional view of the rotor of the brushless DC motor shown in FIG. FIG. 3 is an enlarged view of a portion A in the structural cross-sectional view of the rotor of the brushless DC motor shown in FIG. 2.

  First, the basic configuration of the rotor of the brushless DC motor according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The rotor of the brushless DC motor according to the first embodiment includes a laminated iron core 1 in which a plurality of thin steel plates are laminated, and permanent magnets 2 embedded in a plurality of holes provided in the laminated iron core 1. In the rotor in which the end plate 3 to be prevented, the refrigerant guide 8 for separating the refrigerant and the refrigerating machine oil in the compressor, and the compressor counter mechanism side balance weight 5 are fixed by a plurality of rivets 7, the refrigerant guide 8 and the compressor mechanism side balance weight part 6 are united.

  Next, the brushless DC motor rotor according to the first embodiment of the present invention will be described in more detail.

  In FIG. 1 and FIG. 2, the laminated iron core 1 is formed by laminating a plurality of thin steel plates. The laminated iron core 1 is provided with four rectangular holes, and permanent magnets 2 are embedded in the respective holes. As the thin steel plate, for example, a 0.5 mm to 0.5 mm electromagnetic steel plate is used. The four permanent magnets 2 constitute a quadrupole (NSS). As a material of the permanent magnet 2, a neodymium magnet or a ferrite magnet is suitable.

  End plates 3 for preventing the permanent magnet 2 from jumping out are stacked on both ends of the laminated core 1. Further, a compressor mechanism side balance weight portion 6 is integrated with the refrigerant guide 8 for the purpose of separating the refrigerant and the refrigerating machine oil in the compressor. The balance weight unit-integrated refrigerant guide 8 and the compressor counter mechanism side balance weight 5 are fixed by four rivets 7. As the material of the refrigerant weight 8 integrated with the balance weight portion, brass or high manganese steel (non-magnetic material) is generally suitable, and is produced by a die casting method or cold forging. The compressor mechanism side balance weight portion 6 is formed as, for example, a thick portion integrated with the refrigerant guide 8.

  For example, when the balance weight part-integrated refrigerant guide 8 is made of a brass die-cast product, the K part in FIG. 3 (the outer periphery of the bottom of the balance weight part-integrated refrigerant guide 8) can be made at a right angle. In addition, it is possible to securely sandwich the rotor core from the conventional refrigerant guide 104 having roundness (the conventional coolant guide 104 is rounded because it is manufactured by pressing).

  4 is a structural cross-sectional view of the rotor of the brushless DC motor according to the second embodiment of the present invention. FIG. 5 is a structural cross-sectional view of the rotor of the brushless DC motor shown in FIG. It is the B section enlarged view in the structure sectional drawing of the rotor of the brushless DC motor shown in FIG.

  4 and 5, the laminated iron core 11 is formed by laminating a plurality of thin steel plates. The laminated iron core 11 is provided with four rectangular holes, and permanent magnets 12 are embedded in the respective holes. As the thin steel plate, for example, a 0.5 mm to 0.5 mm electromagnetic steel plate is used. The four permanent magnets 12 form a quadrupole (NSS). As a material of the permanent magnet 12, a neodymium magnet or a ferrite magnet is suitable.

  An end plate 13 for preventing the permanent magnet 12 from jumping out is stacked on the side of the laminated core 11 opposite to the compressor. Furthermore, the refrigerant guide 18 for the purpose of separating the refrigerant and the refrigerating machine oil in the compressor, the refrigerant weight 18 on the compressor mechanism side balance weight portion 16 and the end plate are integrated, and the counter mechanism side balance weight 15 is provided with four rivets. 17 is fixed. As the material of the balance weight unit-integrated refrigerant guide 18, brass or high manganese steel (non-magnetic material) is generally suitable as in the case of the first embodiment.

  For example, when the balance weight unit-integrated refrigerant guide 18 is a brass die cast product and is further manufactured by cutting on the surface side in contact with the laminated iron core 11, the K portion (balance weight unit integrated type) of FIG. The outer peripheral portion of the bottom of the refrigerant guide 18 can be made at a right angle than that described in the first embodiment. Thereby, it becomes the structure which can delete the end plate 3 by the side of the compressor mechanism currently used for Example 1. FIG. This configuration also allows the rotor core to be securely sandwiched by the conventional refrigerant guide having a roundness (the conventional refrigerant guide is always rounded because it is manufactured by pressing).

  As described above, with this configuration, the number of parts can be further reduced as compared with the first embodiment, and a low-cost and high dimensional accuracy rotor can be manufactured.

  FIG. 7 is a structural cross-sectional view of a compressor in Embodiment 3 of the present invention in which the rotor of the brushless DC motor in the embodiment of the present invention is incorporated.

  In FIG. 7, the sealed container 21 includes an electric motor unit 30 and a compression mechanism unit 23 therein. The electric motor unit 30 includes a stator 31 around which a winding is wound, and a rotor 32 disposed so as to face the stator 31 via an annular gap. A shaft 28 fixed to the rotor 32 is rotatably supported by a main bearing 29 and a sub bearing 35.

  In the cylinder 34, a roller 33 having an eccentric portion 36 and fitted into the shaft 28 is disposed. The rotor 32 is rotated by energizing the windings of the stator 31. Then, the roller 33 makes a planetary motion around the shaft 28 around the shaft 28 in the cylinder 34. A suction hole 25 is formed in the cylinder 34 and is connected to an accumulator (not shown) through the suction pipe 24. Refrigerating machine oil 37 that is lubricating oil is stored at the bottom of the sealed container 21.

  The rotor of the brushless DC motor according to the embodiment of the present invention can be incorporated in the stator 31.

  FIG. 8 is a structural diagram of a device (air conditioner outdoor unit) according to a fourth embodiment of the present invention on which the compressor according to the present embodiment is mounted.

  In FIG. 8, the air conditioner outdoor unit 41 has a housing 50. The air conditioner outdoor unit 41 is partitioned into a compressor chamber 46 and a heat exchanger chamber 49 by a partition plate 44 erected on the bottom plate 42. A compressor 45 is disposed in the compressor chamber 46. The heat exchanger chamber 49 is provided with a heat exchanger 47 and a fan motor 48 for blowing air. An electrical component box 40 is disposed on the partition plate 44.

  The fan motor 48 is configured by attaching a blower fan to the rotating shaft of a brushless DC motor. The fan motor 48 is driven by a motor driving device 43 housed in the electrical component box 40. The blower fan rotates as the fan motor 48 rotates, and the heat exchanger chamber 49 is cooled by the wind.

  Here, the compressor 45 can be mounted with the compressor in the above-described embodiment of the present invention.

  As is clear from the above, the rotor of the brushless DC motor of the present invention makes it possible to manufacture a rotor with low cost and high dimensional accuracy, especially for use in compressors mounted on air conditioning equipment, refrigeration equipment and hot water supply equipment. Useful.

  The rotor of the DC brushless motor for a compressor according to the present invention makes it possible to produce a rotor with low cost and high dimensional accuracy, and is particularly useful for a compressor mounted in an air conditioner, a refrigeration device, or a hot water supply device.

Sectional drawing of the structure of the rotor of the brushless DC motor in Embodiment 1 of the present invention Structural sectional view taken along line 2-2 of the rotor of the brushless DC motor shown in FIG. Enlarged view of part A in the structural cross-sectional view of the rotor of the brushless DC motor shown in FIG. Sectional drawing of structure of rotor of brushless DC motor in Embodiment 2 of the present invention Structural sectional view taken along line 5-5 of the rotor of the brushless DC motor shown in FIG. FIG. 5 is an enlarged view of a portion B in the structural cross-sectional view of the rotor of the brushless DC motor shown in FIG. Cross-sectional view of the structure of a compressor in Embodiment 3 of the present invention incorporating the rotor of a brushless DC motor in the embodiment of the present invention Structure diagram of equipment (air conditioner outdoor unit) in Example 4 of the present invention equipped with a compressor in Example of the present invention Sectional view of structure of rotor of brushless DC motor for compressor of conventional example 1 FIG. 9 is a structural cross-sectional view taken along the line 10-10 of the rotor of the brushless DC motor for the compressor shown in FIG. The C section enlarged view in the structure sectional drawing of the rotor of the brushless DC motor for compressors shown in FIG. Cross-sectional view of the structure of the rotor of the brushless DC motor for the compressor of Conventional Example 2 Sectional drawing of the structure of the rotor of the brushless DC motor for compressors shown in FIG. The D section enlarged view in the structure sectional drawing of the rotor of the brushless DC motor for compressors shown in FIG. The figure which shows the rotor core sheet | seat of the brushless DC motor for the conventional compressors

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminated core 2 Permanent magnet 3 End plate 5 Compressor counter mechanism side balance weight 6 Compressor mechanism side balance weight part 7 Rivet 8, 18, 104 Refrigerant guide 309 Permanent magnet insertion hole 310 Refrigerant passage hole 311 Rivet insertion hole 312 Compressor Mechanism shaft hole

Claims (5)

A laminated iron core in which a plurality of thin steel plates are laminated;
An end plate for embedding permanent magnets in a plurality of holes provided in the laminated core, and further preventing the permanent magnets from jumping out;
A refrigerant guide for separating refrigerant and refrigeration oil in the compressor;
In the rotor fixed to the compressor counter mechanism side balance weight with multiple rivets,
A rotor of a brushless DC motor in which the refrigerant guide and a compressor mechanism side balance weight part are integrated. The rotor of a brushless DC motor according to claim 1, wherein the end plate, the refrigerant guide, and the compressor mechanism side balance weight portion are integrated. The rotor of a brushless DC motor according to claim 1, wherein the compressor mechanism side balance weight portion is a thick portion integrally formed with the refrigerant guide. A rotor of the brushless DC motor according to claim 1, a stator disposed to face the rotor, and a sealed container in which the rotor and the stator are incorporated. Compressor. The apparatus provided with the compressor of Claim 4, and the housing | casing in which the said compressor is mounted.

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