KR20090056075A - Motor for compressor and recipro compressor having the same - Google Patents

Abstract

A motor for a compressor and a reciprocation compressor having the same are provided to prevent the efficiency reduction of a motor according to the use of aluminum coil by appropriately designing the curvature of a slot part in comparison with the width of a teeth part. A motor for a compressor comprises a stator(210) and a coil(240). The stator has a plurality of teeth parts(212) and slot parts(213). The teeth part is longitudinally formed in a radial direction. The slot part is concavely formed between teeth parts. The slot part has outer surfaces curved at predetermined curvature. The curvature of the outer surface is enlarged as the width of the teeth part becomes smaller. The coil is wound in the teeth part and slot part of the stator and is partially made of aluminum material to reduce material cost.

Description

Compressor Motor and Reciprocating Compressor Applying It {MOTOR FOR COMPRESSOR AND RECIPRO COMPRESSOR HAVING THE SAME}

The present invention relates to a reciprocating compressor to which the compressor motor is applied.

In general, a single-phase induction motor is widely known as a compressor motor used for home appliances. Single-phase induction motor is built in a compressor that is applied to refrigerators, air conditioners, etc., which are small household electric appliances. The single-phase induction motor is provided with a stator to which a coil is wound, a conductor made of a cage shape, and the like, and a rotor rotatably inserted into the inside of the stator, and pressed into the center of the rotor to compress the rotational force of the compressor. It consists of a rotating shaft that transmits to the part.

Both the stator and the rotor are fixed by welding by stacking a plurality of thin core cores (stator core), the stator core and the yoke portion (yoke portion) to form a movement path of the magnetic flux is formed in a substantially annular shape, the yoke portion A plurality of teeth portions protruding at predetermined intervals on an inner circumferential surface of the coil and a slot portion cut between the teeth portions are formed.

Copper (Cu) having good electrical conductivity is widely used. The conductivity usually indicates the degree of good current flow in the material. However, the high conductivity does not necessarily mean that there are more electrons flowing. Since the number of electrons is proportional to the current, even if the conductivity is bad, it can be said that the number of electrons is the same if the current is the same. However, the higher the conductivity for the same current can reduce the loss (heat) generated by itself. Silver (Ag) is known as the metal with the highest conductivity, but since silver is expensive, copper, which is relatively inexpensive and has good conductivity, is widely used as a coil used in a compressor motor.

However, in the case of compressors, along with a long development history, the technology has advanced greatly, and demands a variety of functions and at the same time demands a more inexpensive compressor. However, in the case of the coil, which takes a large part of the manufacturing cost of the motor for the compressor, as described above, the efficiency of the motor can be largely influenced, and thus, even though the cost is still high, the conductive material such as copper is still used. .

The present invention solves the problems of the conventional compressor motor as described above, to provide a compressor motor and a reciprocating compressor employing the same that the coil of the compressor motor is cheaper than copper and can maintain a certain degree of motor efficiency. There is an object of the present invention.

In order to achieve the object of the present invention, a stator having a plurality of teeth formed radially long and a plurality of slots formed concave between the teeth; A coil wound at a tooth portion and a slot portion of the stator, at least a portion of which is made of aluminum; A rotor inserted into the stator at predetermined intervals and having a conductor therein to rotate by electromagnetic induction of the coil; And a rotating shaft press-fitted to the center of the rotor to transmit rotational force to the compression unit, wherein the slot portion is formed such that its outer side surface is curved with a predetermined curvature, and the outer side surface curvature of the slot portion has a width of the tooth portion. There is provided a motor for a compressor that is formed larger as smaller.

In addition, a sealed container in which a predetermined amount of oil is accommodated; A drive motor installed inside the sealed container to generate a rotational force; A cylinder block installed in the sealed container to form a compression space; A connecting rod having one end coupled to a rotation shaft of the drive motor to convert the rotational movement into a linear movement; A piston coupled to the other end of the connecting rod to compress the refrigerant while linearly moving in the compression space of the cylinder block; And a valve assembly coupled to the cylinder block to limit suction and discharge of the refrigerant, wherein the driving motor is formed of an aluminum coil, and the slot portion is formed so that its outer side is curved with a predetermined curvature, and the curvature of the slot portion Is provided with a reciprocating compressor which is formed to be larger as the width of the tooth portion becomes smaller.

The compressor motor and the reciprocating compressor using the same according to the present invention can greatly reduce the material cost of the compressor motor and the reciprocating compressor by using an aluminum coil. In addition, by appropriately designing the curvature of the slot portion relative to the width of the tooth portion, it is possible to prevent the efficiency reduction of the compressor motor and the reciprocating compressor by using the aluminum coil.

Hereinafter, a compressor motor according to the present invention and a reciprocating compressor using the same will be described in detail with reference to the embodiments shown in the accompanying drawings.

As shown in FIGS. 1 and 2, the compressor motor 200 according to the present invention includes a stator 210 fixed to a sealed container of a compressor and wound around a coil 240, and inside the stator 210. Rotor 220 is inserted into the rotatable and provided with a conductor 250 therein, and the rotating shaft 230 is pressed into the center of the rotor 220 to transmit the rotational force to the compression unit of the compressor.

The stator 210 is a plurality of iron cores are laminated in the axial direction by a predetermined height is fixed by welding or the like. The iron core has an outer circumferential surface formed in a substantially rectangular shape (sometimes close to a circular shape), and a rotor insertion hole 210a having an inner circumferential surface formed in a substantially circular shape is formed.

The iron core is connected to the outer side in a substantially circumferential direction to form a yoke portion 211 forming a movement path of the magnetic flux. The yoke portion 211 may be integrally formed, but may be formed in an arc shape according to the sheet metal working method of the iron core to be uneven or welded to each other. In addition, the yoke part 211 has a great influence on the efficiency of the motor. The total effective area of the yoke part 211 is determined when the inner diameter of the stator 210 and the total area of the slot part 213 to be described later are determined. Can be determined accordingly.

3 and 4, the iron core protrudes radially from the inner circumferential surface of the yoke part 211 at predetermined intervals to form a plurality of tooth parts 212 on which the coil is wound. The teeth parts 212 are formed at substantially equal intervals with the slot part 213 described later along the circumferential direction. The teeth portions 212 are formed to have substantially the same width length B in the longitudinal direction, and the width length B of the teeth portions 212 may vary depending on the capacity of the motor, but is approximately longer than the radial length L. Not formed. The outer sides of the tooth parts 212 are curvedly connected to each other with neighboring tooth parts having a predetermined curvature R.

The ratio between the width B of the teeth parts 212 and the curvature R between the teeth parts 212, that is, the curvature R of the slot part 213 to be described later, is related to the efficiency of the compressor motor. have. For example, when the width B of the tooth part 212 is 4.00 mm and the curvature R of the slot part 213 is 3.46 mm as shown in FIG. 5 (experiment 1), the width of the tooth part 212 is shown. The ratio B / R of the curvature R of the slot part 213 to the length B becomes 1.15, and the motor efficiency at this time becomes 60.3%. In addition, when the width B of the teeth 212 is 3.90 mm and the curvature R of the slots 213 is 3.54 mm (experiment 2), the width B of the teeth 212 is measured. The ratio B / R of the curvature R of the slot portion 213 becomes 1.10 and the motor efficiency at this time is 65.5%. In addition, when the width B of the teeth 212 is 3.80 mm and the curvature R of the slots 213 is 3.60 mm (experiment 3), the width B of the teeth 212 is measured. The ratio B / R of curvature R of the slot portion 213 becomes 1.05, and the motor efficiency at this time is 69.6%. Therefore, in the compressor motor 200, the lower the curvature R ratio (B / R) of the slot portion 213 to the width B of the tooth portion 212, the higher the efficiency of the motor is. / R) is preferably formed smaller than approximately 1.15. The curvature of the slot 213 may be substantially the same as the curvature of the main slot 213a to which the main coil is wound, and the curvature of the sub slot 213b to be described later to which the sub coil is wound.

The ratio (D / B) of the width B of the teeth 212 and the inner diameter D of the stator 210 is also related to the efficiency of the compressor motor. That is, in the compressor motor 200, the higher the width B ratio of the tooth portion 212 to the inner diameter D of the stator 210, the higher the efficiency of the motor, and the higher the ratio D / B. The range is preferably formed at approximately 13.9 or more.

At the central end of the tooth parts 212, a pole part 212a is formed to extend at a predetermined distance from the neighboring tooth part 212. The pole portion spacing (or the opening side width of the slot portion) A may be formed at least not smaller than the diameter d of the coil 240 to facilitate the winding of the coil 240. The pole portion A has a great influence on the efficiency of the motor, and may be formed differently according to the material of the coil 240, the diameter d of the coil, and the number of slots of the stator 210. For example, the pole portion spacing A may be formed to be about 1.73 mm or less in the 20 slot stator, about 2.10 mm or less in the 24 slot stator, and may be formed to be about 2.00 mm or less in the 28 slot stator. Can be.

The iron core is formed with slot portions 213 recessed and recessed at substantially equal intervals to form a space in which the coil 240 is inserted between the tooth portions 212. The slots 213 are radially elongated in planar projection, and both side surfaces thereof are formed to be widened toward the outer side from the center side, and the outer side surfaces thereof are curved outwardly.

3 and 4, the slot part 213 includes a plurality of main slot portions 213a to which the main coil is wound, and a plurality of sub slot portions to which the sub coil is wound. 213b. The main slot parts 213a and the sub slot parts 213b are alternately formed at regular intervals along the circumferential direction. For example, as shown in FIG. 4, a plurality of main slot portions 213a are formed along the circumferential direction, and then a plurality of sub slot portions 213b are formed with a phase difference of 90 °, and then a plurality of main slot portions 213a are formed. Is formed with a phase difference of 90 degrees, and the plurality of subslot portions 213b may be formed with a phase difference of 90 degrees.

The cross-sectional areas of the main slot parts 213a may be larger than the cross-sectional areas of the sub slot parts 213b. The cross-sectional areas of the main slot part 213a and the sub slot part 213b may be appropriately determined relative to the number of turns of the coil in consideration of the productivity of the motor. That is, in the case of the main slot portion 213a, the ratio N / S1 of the cross-sectional area S1 of the slot portion 213a to the number of turns N is 2.18 or more, more precisely 2.20 or more, and the sub slot portion In the case of 213b, it may be preferable that the ratio N / S2 is formed to be 1.85 or more. Here, the cross sectional area of the main slot portion 213a and the cross sectional area of the sub slot portion 213b may be the main slot portion 213 as well as the case in which the aluminum coil is wound around the main slot portion 213a and the sub slot portion 213b. The same applies to the case of winding a copper coil in 213a and an aluminum coil in the subslot portion 213b.

In addition, the main slot portion 213a and the sub slot portion 213b may have the same cross-sectional area, the total cross-sectional area, and the same number, or may be different from each other. This may be designed in consideration of the cost-effectiveness of the coil wound around the motor. For example, when all of the coils 240 are used as aluminum coils, the individual cross-sectional area, the total cross-sectional area, and the number of the main slot part 213a and the sub slot part 213b may be enlarged compared to the copper coil, but the relative ratios thereof are increased. May be formed so as not to be significantly different from the shape of the slot portion of a conventional motor. However, when an aluminum coil is used for the main slot part 213a and a copper coil is used for the sub slot part 213b, the diameter of the aluminum coil is larger than the diameter of the copper coil. The cross sectional area, the total cross sectional area, and the number may increase relative to the sub slot portion 213b. On the contrary, in the case where a copper coil is used for the main slot part 213a and an aluminum coil is used for the sub slot part 213b, the individual cross-sectional area, the total cross-sectional area, and the number of the sub slot parts 213b are in the main slot part 213a. Can be increased relatively.

The coil 240 wound around the stator 210 has a conductivity lower than that of copper (a conductivity of 99.9%), but a relatively low conductivity of copper, and is particularly cheaper than copper (a conductivity of 62.7%). Can be used.

Since the aluminum coil may have a lower conductivity than the copper, the efficiency of the compressor motor 200 may be lowered. Therefore, in order to compensate for this, the aluminum coil is preferably formed to be about 25% thicker than the copper coil. .

In the case of the aluminum coil, since the rigidity of the aluminum coil is lower than that of copper, the thickness of the enamel layer coated with the insulating coating on the outer circumferential surface of the aluminum coil is at least thinner than that of the enamel layer coated on the outer circumferential surface of the copper coil. It may be desirable to keep the coil rigidity.

In addition, in the case of the aluminum coil, the damping effect may be deteriorated due to the rigidity of the aluminum coil compared to the copper coil. As a result, noise in the low frequency band may be increased, but this may be solved by optimizing the inner diameter D of the stator 210 and the area S of the slot part 213, or the inner diameter of the stator 210. D) and the height of the lower end coil 242 can be optimized and eliminated.

On the other hand, the reciprocating compressor to which the reciprocating motor according to the present invention as described above is as shown in FIG.

That is, the reciprocating compressor according to the present invention includes a sealed container (210), a drive motor (200) which is a driving source installed in the sealed container (100), and a piston (3) on the rotating shaft (230) of the drive motor (200). Compression unit 300 for compressing the refrigerant while reciprocating in a straight line in the compression space of the cylinder block 310 is provided with a valve assembly 340, the piston 320 is connected to the connecting rod 330 And a support part 400 installed between the bottom surface of the sealed container 100 and the bottom surface of the drive motor 200 to elastically support the drive motor 200 and the compression part 300.

The driving motor 200 is a compressor motor, that is, the aluminum coil is inserted into both the main slot portion 213a and the sub slot portion 213b of the stator 210 and wound around the tooth portion 212 or The main slot part 213a is inserted with a copper coil, while an induction motor is applied to the sub slot part 213b with an aluminum coil inserted and wound around each tooth part 212. Since the configuration of the stator 210 is the same as that described in the above-described reciprocating motor, the driving motor 200 will not be described in detail.

However, in order to maintain the efficiency of the motor, the drive motor 200 has a diameter larger than that of a conventional copper coil, so that the weight of the stator 210 is increased, and the upper side of the stator 210 is increased. As the height of the end coil 241 and the lower end coil 242 increases, the installation position of the compression unit 300 is increased in consideration of interference with the compression unit 300 and the height of the sealed container 100 is increased. There is a need. And as the weight of the stator 210 increases, it is necessary to increase the longitudinal elastic force of the support part 400. To this end, the height of the compression coil spring constituting the support part 400 may be lowered, but in this case, the oil feeder 231 installed at the lower end of the rotation shaft 230 of the driving motor 200 does not hit the airtight container 100. Consideration should be given to: In consideration of the increase in the weight of the stator 210 and the height of the compression unit 300, the weight of the eccentric mass installed in the rotor 220 or the rotating shaft 230 must be adjusted appropriately. Friction between the stator 210 and the rotor 220 of the 200 and the noise due to this can be prevented.

In the reciprocating compressor according to the present invention as described above, when power is supplied to the drive motor 200, the rotary shaft 230 rotates and its rotational power is linearly reciprocated by the connecting rod 330 by the connecting rod 330. It is converted into motion and transmitted. In addition, the compression unit 300 is a series of processes in which the piston 320 inhales and compresses the refrigerant through the valve assembly 340 while reciprocating linearly in the compression space of the cylinder block 310 and then discharges it to the refrigeration system. Will be repeated.

At this time, when the AC power from the outside is applied to the main coil and the auxiliary winding wound on the stator 210, the driving motor 200 has a polar axis at 90 ° electrically than the main coil by forming a rotor magnetic field by electric current. The force that the preceding auxiliary winding preferentially rotates acts, and in the auxiliary winding, the high-speed rotation is performed because the current phase is ahead of the main coil by a capacitor connected in series. Then, while the driving motor 200 rotates at a high speed, the rotational force is transferred to the piston 320 while being converted into a linear motion through the connecting rod 330.

As such, as the driving motor is wound around the aluminum coil, the material cost of the driving motor is reduced accordingly, and the production cost can be greatly reduced without significantly changing the efficiency of the reciprocating compressor compared to the winding of the copper coil. In addition, the individual cross-sectional area, the total cross-sectional area or the number of the main slot portion and the sub slot portion can be appropriately designed to increase the cost-effectiveness of the reciprocating compressor. In addition, when the curvature of the slot portion is properly designed relative to the width of the tooth portion, the efficiency of the compressor motor and the reciprocating compressor applying the same may be improved.

The compressor motor of the present invention can be similarly applied to other compressors in addition to the reciprocating compressor. However, the specification of each component may vary slightly for each compressor.

1 is an exploded perspective view showing a motor for a compressor of the present invention;

2 is a plan view of the motor for a compressor according to FIG.

3 is a perspective view showing a stator of the compressor motor according to FIG. 1;

4 is a plan view showing a stator of the motor for a compressor according to FIG. 1;

5 is an experimental table and a graph showing the ratio of the coil and pole spacing (tees spacing) and the motor efficiency in the compressor motor according to FIG.

Figure 6 is a longitudinal sectional view showing a reciprocating compressor to which the compressor motor according to Figure 1 is applied.

** Description of symbols for the main parts of the drawing **

100: sealed container 200: drive motor (compressor motor)

210: stator 211: yoke part

212: Teeth portion 212a: Pole portion

213: slot portion 213a: main slot portion

213b: subslot portion 240: coil (aluminum coil)

241,242: end coil 300: compression unit

400: support

Claims (25)

A stator having a plurality of teeth portions radially elongated and a plurality of slot portions concavely formed between the teeth portions; A coil wound at a tooth portion and a slot portion of the stator, at least a portion of which is made of aluminum; A rotor inserted into the stator at predetermined intervals and having a conductor therein to rotate by electromagnetic induction of the coil; And And a rotation shaft press-fitted into the center of the rotor to transmit rotational force to the compression unit. The slot portion is formed so that the outer surface is curved with a predetermined curvature, the outer surface curvature of the slot portion is formed as the width of the tooth portion is smaller becomes larger. The method of claim 1, And the curvature (R) ratio (B / R) of the slot portion to the width length B of the tooth portion is formed to be about 1.15 or less. The method of claim 2, And the slot part includes a main slot part to which the main coil is wound and a sub slot part to which the sub coil is wound, and the curvature of the main slot part is substantially equal to the curvature of the sub slot part. The method of claim 1, Compressor motors each of the poles are formed on both sides of the inner end of the tooth portion and the neighboring tooth portion and at least a gap not greater than the diameter of the coil. The method of claim 1, And the width of the tooth portion is not smaller than at least the diameter of the coil. The method of claim 1, And the outer end of the tooth portion is connected to a neighboring tooth portion with a curved surface that is at least not less than the curvature of the coil. The method of claim 1, The slot part has a cross-sectional area of the main slot portion to which the main coil is wound and the sub slot portion to which the sub coil is wound are different from each other, and the main slot portion and the sub slot portion are alternately arranged several times. The method of claim 7, wherein And the coils inserted into the main slot part and the sub slot part are all aluminum coils. The method of claim 7, wherein The main slot unit is wound around the coil of a different material having a higher conductivity than aluminum, the sub-slot unit is a motor for a compressor is wound. The method of claim 9, The coil of the main slot unit is a copper coil compressor. The method of claim 7, wherein An aluminum coil is wound around the main slot part, and a coil of another material is wound around the sub slot part. The method of claim 11, The coil of the subslot part is a copper coil compressor. The method of claim 1, The slot unit has a cross-sectional area of the main slot portion to which the main coil is wound and the cross-sectional area of the sub slot portion to which the sub coils are formed to be equal to each other, and the main slot portion and the sub slot portion are alternately arranged several times. The method of claim 13, And the coils inserted into the main slot part and the sub slot part are all aluminum coils. The method of claim 13, The main slot unit is wound around the coil of a different material having a higher conductivity than aluminum, the sub-slot unit is a motor for a compressor is wound. The method of claim 15, The coil of the main slot unit is a copper coil compressor. The method of claim 13, An aluminum coil is wound around the main slot part, and a coil of another material is wound around the sub slot part. The method of claim 17, The coil of the subslot part is a copper coil compressor. The method of claim 1, The slot motor is a compressor motor which is arranged alternately several times each other the number of the main slot portion to which the main coil is wound and the sub slot portion to which the sub coil is wound. The method of claim 19, And the coils inserted into the main slot part and the sub slot part are all aluminum coils. The method of claim 19, The main slot unit is wound around the coil of a different material having a higher conductivity than aluminum, the sub-slot unit is a motor for a compressor is wound. The method of claim 21, The coil of the main slot unit is a copper coil compressor. The method of claim 19, An aluminum coil is wound around the main slot part, and a coil of another material is wound around the sub slot part. The method of claim 23, wherein The coil of the subslot part is a copper coil compressor. An airtight container containing a predetermined amount of oil; A drive motor installed inside the sealed container to generate a rotational force; A cylinder block installed in the sealed container to form a compression space; A connecting rod having one end coupled to a rotation shaft of the drive motor to convert the rotational movement into a linear movement; A piston coupled to the other end of the connecting rod to compress the refrigerant while linearly moving in the compression space of the cylinder block; And a valve assembly coupled to the cylinder block to limit suction and discharge of the refrigerant. The drive motor is a reciprocating compressor having a feature of any one of claims 1 to 24.

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