KR20090065601A - Motor and a compressor including the same - Google Patents

Abstract

A motor and a compressor are provided to reduce the cost of coils for reducing the manufacturing cost while improving reliability and durability by increasing heating performance. A motor includes a stator(100) and a rotor rotating in the stator. The stator is wound with a stator coil. The stator coil includes a main coil and a sub coil, both being formed of aluminum. The main coil forms different polarities at right and left sides with respect to a longitudinal central axis in a plane section of the stator. The sub coil forms different polarities at upper and lower sides with respect to a traverse central axis in the plane section of the stator.

Description

Motor and compressor including the same {Motor and a Compressor including the same}

The present invention relates to a compressor, and more particularly to a compressor having a low production cost by minimizing the material cost of the motor used in the compressor. In addition, the present invention relates to a compressor that is close to the performance of a conventional compressor despite the lower production cost.

In general, the motor transmits the rotational force of the rotor to the rotary shaft, the rotary shaft drives the load. For example, the rotating shaft may be connected to the drum of the washing machine to drive the drum, and may be connected to the fan of the refrigerator to drive the fan so that cold air is supplied to the required space.

In addition, the motor may be applied to a compressor for compressing a fluid, in particular a refrigerant. In general, the compressor may be classified into a rotary compressor with a rotary motor, a reciprocating compressor, and a linear compressor with a linear motor.

First, a conventional compressor and a motor applied thereto will be described in detail with reference to FIGS. 1 and 2.

1 is a longitudinal sectional view of a compressor equipped with a motor according to the prior art, Figure 2 is a plan sectional view of a general motor.

As shown in FIG. 1, the compression tube 1 includes a compression mechanism unit and an electric drive unit for driving the compression mechanism unit.

The electric machine part includes a stator 2 for generating magnetic force when a power is applied, a rotor 3 rotating in electromagnetic interaction with the stator 2, and a shaft 5 fixed and rotating in the center of the rotor. It is done by

The compressor mechanism includes a cylinder (6) positioned below the power mechanism and configured to suck and discharge refrigerant gas into the suction and discharge ports, and an accumulator (7) for preventing liquid refrigerant from flowing into the cylinder. It can be done by.

The stator 2 is formed by stacking plate members. The stator 2 includes a ring-shaped yoke 11 constituting a body, a plurality of teeth 13 protruding radially from the yoke 11, and It comprises a plurality of slots (12) for receiving the coil into the space formed between the neighboring teeth. Here, the radial ends of the teeth 13 form a rotor insertion hole having a predetermined inner diameter 2a to accommodate the rotor.

The yoke 11 is a space through which the magnetic field formed by the current flowing in the coil can flow, and the width thereof is determined in consideration of the magnetic flux density. That is, the width is determined so that the magnetic flux density is not saturated, but the width should be determined in consideration of the material cost and the size of the motor.

The stator is formed in a substantially circular flat section having a predetermined outer diameter (2b), the outer portion of the stator is formed with an air cut 14 is cut partially. The air cut forms a passage through which oil and refrigerant gas pass for smooth lubrication and heat dissipation between the outer part of the stator and the case 1 of the compressor.

On the other hand, the rotor 3 is also formed by stacking plate members similarly to the stator 2. The rotor 3 is formed in the center portion of the ring-shaped yoke 20 constituting the body, the radially outer side of the yoke It comprises a plurality of slots 21 provided in the circumferential direction of the rotor, and a tooth 23 formed between the slots 21. In this case, a rod made of aluminum is generally pressed or molded into the slot 21. This is generally referred to as conductor bar 22.

In addition, the yoke 20 and the tooth 23 in the rotor 3 is preferably designed such that the magnetic flux density does not saturate into a space in which magnetic flux flows.

The rotor 3 has a stator 2 located therein, and an air gap 9 is formed between the rotor 3 and the stator 3. Thus, the rotor 3 rotates without being in physical contact with the stator 2 due to the air gap.

3 is a magnetic flux distribution diagram showing a magnetic flux density distribution in a stator of a general motor.

As shown in FIG. 3, the maximum magnetic flux is 1.78 (unit T, which is equal to or less), and the magnetic flux density distribution is good. In addition, air cuts are formed at both ends with respect to the horizontal center axis of the stator flat end surface. This part is the lowest magnetic flux density, and the air cut is generally formed in this part because the magnetic flux saturation does not occur even if the yoke is narrowed.

However, in the conventional motor, in particular, the motor applied to the compressor, there is a problem that the air cut 14 is not enough, the oil or gas oil discharge is not smooth. This caused a problem that adversely affects the reliability of the compressor. Accordingly, there is a need to solve the problem of securing the air cut 14 to secure the motor, in particular, the compressor.

On the other hand, excessively securing the air cut 14 area may cause magnetic flux saturation of the stator, and thus should be avoided in terms of motor efficiency and compressor efficiency. Therefore, in order to solve the above problem, it is necessary to consider the magnetic flux saturation of the stator.

Moreover, in such a compressor, the volume ratio and material cost which the said motor occupies are much higher compared with other home appliances. Of course, the ratio of the motor weight to the total weight is also relatively high. Therefore, the problem of the material cost, the volume of the motor, and the weight of the motor by the motor is relatively large for the compressor.

On the other hand, in such a rotary motor, the rotor is rotated by electromagnetic interaction with the stator. To this end, a stator coil is wound around the stator, and as the current is applied to the coil, the rotor rotates with respect to the stator.

The coil is generally formed of a copper material. This is because the copper material has a very good conductivity, and also has excellent ductility, so that there is little damage in winding.

However, the copper material has a relatively high cost and there is a problem that the manufacturing cost of the motor increases. Therefore, due to such an increase in the manufacturing cost of the motor, the manufacturing cost of the compressor to which the motor is applied is also forced to increase.

In addition, there are many cases in which stable supply and demand of raw materials are not achieved due to a surge in copper prices in addition to rising manufacturing costs. This is a big problem on the premise that the motor must be produced stably and in large quantities.

Therefore, it is necessary to reduce the manufacturing cost of the motor by using a coil of a material other than the copper coil and to ensure a stable supply and demand of raw materials. In addition, there is a need to provide a motor having satisfactory performance compared to using a coil made of copper even though other coils are used.

On the other hand, when replacing a coil of copper material with a coil of another material, it is preferable not to greatly change the conventional configuration. This is because, even if the cost of the coil itself is reduced, initial capital investment costs may be excessively increased if other necessary components must be newly designed and manufactured.

The present invention basically aims to solve the above problems.

More specifically, an object of the present invention is to reduce the cost of the stator coil to reduce the manufacturing cost of the motor as a whole to reduce the manufacturing cost of the compressor to which the motor is applied.

In addition, an object of the present invention is to provide a motor having a satisfactory performance compared to the performance of the conventional motor and the performance of the compressor, without reducing the manufacturing cost of the motor, without significantly changing the conventional essential components.

In addition, it is an object of the present invention to provide a motor or a compressor that can be mass-produced, to provide a compressor with improved reliability and durability by improving the heat dissipation performance.

In order to achieve the above object, the present invention provides a compressor in which a motor is driven by a motor including a stator on which a stator coil is wound and a rotor rotated on an inner shaft of the stator. A main coil which is formed and wound to form different magnetic poles on the left and right sides of the stator plane cross-section; And a sub coil formed of an aluminum material and wound to form different magnetic poles at an upper side and a lower side based on a horizontal center axis of the flat cross section.

That is, in the motor of the compressor according to the present invention, both the main coil and the sub coil are preferably made of aluminum.

Here, the ratio of the total number of turns of the sub-coil to the total number of turns of the main coil is preferably 0.70 to 0.75.

The stator may be provided with 24 slots in which the stator coil is wound. In this case, two small slots are formed in the 3 o'clock and 9 o'clock directions of the flat cross section of the stator, and the small slot is preferably smaller in cross-sectional area than other slots (large slots).

The total number of turns of the main coil is 101, and the total number of turns of the sub coil is 74.

On the other hand, when the slots formed in the right side with respect to the longitudinal center axis of the planar cross-section respectively referred to as the first slot to the twelfth slot in the clockwise direction, as the slot number increases, the number of turns of the main coil per slot does not increase. It is preferable. In addition, it is preferable that the main coil is not wound in the sixth slot.

Here, the number of windings of the main coil of the first slot and the second slot is the same, and then the main coil may be wound such that the number of winding of the main coil per slot decreases as the slot number increases.

In addition, as the slot number increases, it is preferable that the number of turns of the sub coils per slot does not decrease. In addition, it is preferable that the sub coil is not wound in the first slot and the second slot.

Here, the sub coil may be wound such that the number of windings of the sub coil per slot increases as the slot number increases after the third slot.

The motor in the compressor according to the present invention preferably has a maximum magnetic flux density of 1.78T or less, and preferably has a refrigeration capacity of 7100 to 16300 Btu.

On the other hand, the stator includes a vertical incision to cut in the vertical direction at both ends of the horizontal central axis of the flat cross-section of the stator to form a passage for entering and exiting the fluid in the stacking direction of the stator; And it is preferable that a horizontal cutout is formed at both ends of the longitudinal central axis of the flat cross section to form a passage for entering and exiting the fluid in the stacking direction of the stator.

In addition, the stator is formed to be symmetrical with each other along the circumferential direction of the stator on the periphery of each quadrant of the stator on the basis of the horizontal center axis of the flat cross-section, incision cut out for access of the fluid in the stacking direction of the stator Addition further formation is preferred.

The present invention can reduce the cost of the coil to reduce the overall manufacturing cost of the motor can provide an economical motor.

In addition, according to the present invention, while reducing the manufacturing cost of the motor, it is possible to provide a mass-producible motor and a compressor using the same without significantly changing the conventional essential components.

In addition, according to the present invention can provide a motor and a compressor having a satisfactory performance compared to the performance of the conventional motor and compressor, it is possible to provide a motor and a compressor that can increase the cost satisfaction effect compared to the efficiency.

In addition, according to the motor and the compressor according to the present invention can improve the heat dissipation performance can provide a motor and compressor with improved reliability and durability.

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

For convenience of explanation, the stator of the motor in the compressor according to the present invention will be described first, and then the rotor will be described. The unit of length is mm unless further stated.

Hereinafter, the stator of the motor in the compressor according to the present invention will be described. The magnetic flux distribution diagrams shown in FIGS. 3, 4 and 6 relate to a motor to which the rotor according to the present invention to be described later is applied.

4 is a magnetic flux distribution diagram that simulates a magnetic flux distribution in a virtual circular stator. In addition, the magnetic flux distribution diagram is a magnetic flux distribution diagram during normal operation. Hereinafter, for convenience of description, the horizontal center axis directions of the plane illustrated in FIG. 4 will be referred to as the 3 o'clock and 9 o'clock directions, respectively, and the vertical center axis directions will be referred to as the 12 o'clock and 6 o'clock directions, respectively. That is, the same as the clockwise direction.

Although not shown in FIG. 4, the stator coil is wound such that the left and right hemispheres having different magnetic poles are formed on the left and right sides of the vertical central axis of the circular stator plane cross section, that is, the left and right hemispheres. That is, if an N pole is formed on the left side of the stator with respect to the longitudinal center axis of the flat cross section while current flows through the coil, an S pole is formed on the right side of the stator. Of course, the center line of the north pole and the south pole will be the horizontal center axis of the plane cross section.

Here, the stator coil may be a main coil wound around the stator. Therefore, when the stator coil includes a sub coil, the sub coil may be wound around the stator to be perpendicular to a spatial electric angle with respect to the main coil. Here, the sub coil performs a function of generating the starting torque of the rotor, and improves the static torque performance together with the main coil.

In other words, when the main coil is wound in the left hemisphere (left) and the right hemisphere (right) of the flat cross section, the sub coil will be wound in the upper hemisphere (upper) and the lower hemisphere (lower) of the flat cross section.

Therefore, as shown in FIG. 4, it can be seen that the magnetic flux density is highest at the teeth of the slot portions at the 12 o'clock and 6 o'clock, 2 o'clock, 4 o'clock, 8 o'clock and 10 o'clock portions. In addition, it can be seen that the maximum value of the magnetic flux density is 1.78. In addition, it can be seen that the magnetic flux density at the outside of the stator at the 3 o'clock and 9 o'clock directions is minimal.

Therefore, it is possible to form an air cut by reducing the yoke width of the stator periphery in the 3 o'clock and 9 o'clock directions. In this case, as shown in FIG. 4, the magnetic flux density distribution will not be significantly affected.

On the other hand, as described above, it is preferable to form an air cut in addition to the 3 o'clock and 9 o'clock directions. Of course, in this case, it is preferable that the maximum value of the magnetic flux density does not exceed 1.78. That is, it can be said that one object is that the maximum value of the magnetic flux density generated in the motor in the motor and the compressor to which the present invention is applied does not exceed 1.78.

Here, the magnetic flux distribution shown in FIG. 4 varies as the rotor rotates. That is, the shape of the magnetic flux distribution as the rotor rotates appears in a form similar to the form in which the magnetic flux distribution shown in FIG. 4 rotates clockwise. In other words, if the magnetic flux distribution of Figure 4 is formed symmetrically with respect to the vertical axis and the horizontal axis, as the rotor rotates, the magnetic flux distribution is formed symmetrically with respect to the form in which the vertical axis and the horizontal axis are rotated clockwise.

However, as the rotor rotates, the aspect and position of the maximum magnetic flux density occur. In addition, the shape and location of the minimum magnetic flux density will be different. This is because, as described above, the stator coil is wound so that the left and right portions are respectively different poles based on 3 o'clock and 9 o'clock. This is because AC power is applied to the stator coil.

Therefore, as the rotor rotates, the magnetic flux distribution form of FIG. 4 is formed at a specific position, and in a specific position, a shape similar to the form in which the magnetic flux distribution of FIG. 4 is rotated 90 degrees will be formed.

Therefore, since the magnetic flux distribution varies depending on the position of the rotor, it is necessary to find a position where the magnetic flux can be afforded by the rotation of the rotor.

5 is a cross-sectional plan view illustrating a stator of a motor according to an embodiment of the present invention, and FIG. 6 is a magnetic flux distribution diagram simulating a magnetic flux distribution in the stator of FIG. 5.

As shown in FIG. 5, the stator 100 of the motor according to the present invention has a substantially circular cross section, and a cutout 116 is formed around each quadrant around the longitudinal center axis of the cross section. Here, the cutouts 116 are formed to be symmetrical with each other along the circumferential direction of the stator. For convenience, this cutout 116 is called an oblique cutout.

More specifically, the cutout formed in one quadrant of the diagonal cutout 116 is preferably formed between the 1 o'clock and 2 o'clock directions. Therefore, it is preferable that the diagonal cutouts 116 are formed in the other quadrant so as to be symmetrical with each other along the circumferential direction.

The stator is inserted into and coupled to the inner circumferential surface of the case 1 (see FIG. 1) or the motor case of the compressor, and the outer shape of the stator is formed to match the shape of the inner circumferential surface of the case. In many cases, since the inner circumferential surface of the case is circular, the shape of the stator is also substantially circular.

On the other hand, the slanted cutout 116 forms a predetermined interval with the inner circumferential surface of the case, and the fluid enters and exits through this interval. In other words, the fluid flows in and out of the stator stacking direction. In other words, the diagonal cutout forms the air cut as described above, and serves as a passage through which oil or refrigerant gas flows out.

More specifically, the diagonal cutout 116 is preferably formed at an angle A between 37 degrees and 43 degrees clockwise with respect to the 12 o'clock direction. That is, it is most preferable to form the cutout within the angle in consideration of the magnetic flux distribution.

On the other hand, as shown in Figure 5, through the oblique incision 116, the width of the yoke 111 of the incision is bound to be narrowed. Therefore, the reduced inner diameter due to the slanted incisions should also be determined in consideration of the magnetic flux distribution.

In addition, the diagonal cutout 116 is preferably formed to have a tangent of a predetermined length (L2) with respect to the center of the stator. This minimizes the width of the yoke that is narrowed due to these incisions and has the effect of making many incisions.

In addition, the diagonal cutout 116 is preferably formed in a groove shape having a tangent of a predetermined length L2 with respect to the center of the stator 100. This minimizes the change in the magnetic flux distribution due to the incision and at the same time has the effect of making many incisions. In other words, it is possible to cut as much as possible within the aforementioned angle. 5 shows an oblique incision in the form of a groove.

Here, the ratio (L3 / D) of the radius L3 to the tangential center to the outer diameter D of the stator is preferably 0.481 to 0.486. Here, 0.481 is a threshold value at which the maximum magnetic flux does not exceed a satisfactory value (for example, 1.78) when the length of the tangent is maximized (that is, when an incision is formed at the widest angle), and 0.486 is the yoke. When the width of is minimized, it means that the maximum magnetic flux is not over the satisfactory value.

In addition, the ratio (L2 / D) of the tangential length (L2) to the outer diameter (D) of the stator is preferably 0.107 to 0.132. Similarly, 0.107 is a threshold value at which the maximum magnetic flux does not exceed a satisfactory value when the width of the yoke is minimized, and 0.132 is a threshold value at which the maximum magnetic flux does not exceed a satisfactory value when an oblique cut is formed at the widest angle. it means.

However, these thresholds cannot be physically the same and will have some flow width depending on the conditions of the motor.

On the other hand, it is preferable that the vertical cutout 114 is formed at both ends of the horizontal cross section of the flat cross section of the stator, that is, at both ends of the 3 o'clock and 9 o'clock directions. This vertical incision also forms a passage for the inflow and out of the fluid in the stacking direction of the stators.

In this case, the yoke width of this part is inevitably narrowed due to the vertical cutout. Therefore, there is a possibility that magnetic flux saturation occurs in the yoke portion of this portion. In order to prevent this, it is preferable that the projected length of the teeth differs from the other parts in the reduced width of the yoke due to the vertical incision. In other words, it is preferable that the small slot 122 is formed in this portion and the large slot 121 is formed in the other portion, so that the small slot inner diameter L4 is smaller than the large slot inner diameter L5.

5 shows an example in which 20 large slots and 4 small slots are formed. Thus, an example is shown in which 24 slots are formed in total.

Of course, due to the small slot 122, the stator coil may be wound relatively less, but as described above, the sub-coil is wound so that different poles are formed at the upper and lower sides based on the small slot, so that the performance of the motor is large. There will be no change.

In addition, since the main coil is not wound around the small slot 122, only the sub coils are wound so that magnetic flux saturation around the small slot can be prevented. This is because the magnetic flux generated by the sub coil is smaller than that of the main coil.

On the other hand, it is preferable that horizontal cutouts 115 are formed at both ends of the longitudinal central axis of the flat section of the stator, that is, at both ends of the 12 o'clock and 6 o'clock directions. This horizontal incision also forms a passage for the passage of the fluid in the stacking direction of the stator.

Here, as described above, the stator coil, that is, the sub coil, is wound based on the 12 o'clock and 6 o'clock directions. Here, the 12 o'clock and 6 o'clock directions are the centers of the magnetic poles formed by the sub coils, but as described above, since the magnetic fluxes formed by the sub coils are smaller than the magnetic fluxes formed by the main coils, horizontal cutouts can be formed in these directions. . In addition, since the main coil is wound in the left and right hemispheres based on the longitudinal center axis, the influence of the magnetic flux due to the main coil can also be minimized.

As shown in FIG. 4, the maximum magnetic flux does not occur outside the stator in the 12 o'clock and 6 o'clock directions. Therefore, it is possible to form a horizontal cutout in this portion in order to increase the air cut area. However, since the 12 o'clock and 6 o'clock directions correspond to the boundary line of the magnetic flux formed by the main coil, the number of turns of the coil is preferably the maximum at this portion. Therefore, it may not be desirable to form a small slot in this portion. Because the small slot has a small cross-sectional area, the number of windings of the coil is inevitably small. Therefore, it is preferable that the incision widths in the 12 o'clock and 6 o'clock directions are smaller than the above-described incision widths of the vertical incisions. As shown in FIG. 5, the length of L1 may be larger than the length of L0.

Here, when the outer diameter of the stator, that is, the maximum outer diameter D is 121.7, the length of the outer diameter L0 at the vertical cutout, that is, the minimum outer diameter, may be up to 114.6. In this case, the length of the vertical cutout is 35. And the inner diameter of the stator may be 61. Therefore, the ratio of the inner diameter to the outer diameter of the stator is approximately 0.50 to 0.53. That is, the minimum of the ratio is the minimum outer diameter of the stator, that is, the ratio of the inner diameter of the stator to the outer diameter at the vertical incision, and the maximum is the ratio of the inner diameter of the stator to the maximum outer diameter of the stator.

As described above, the stator 100 of the motor according to the present invention is formed with cutouts at various positions. In addition, the cutouts 114, 115, and 116 may be formed in combination with each other. For example, the diagonal cutout 116 and the vertical cutout 114, the diagonal cutout 116 and the horizontal cutout 115, and the diagonal cutout 115 and the horizontal 115 and vertical cutout 114. ) Can be combined. According to the present invention through these combinations it is possible to ensure as much air cut area as possible to ensure the reliability of the motor and the compressor applying the same.

On the other hand, the magnetic flux distribution in the form having the highest air cut area (ie, the stator shown in FIG. 5) among the above-described combinations is shown in FIG. 6.

As shown in FIG. 6, since the width of the yoke 111 is partially narrowed, unlike in FIG. 3, it can be seen that the portion where the magnetic flux density is increased is somewhat larger. However, it can also be seen that the maximum flux does not change. This indicates that the loss due to the magnetic flux saturation is not so high even in the stator of the type shown in FIG.

That is, according to the experiments of the present inventors it can be seen that the maximum magnetic flux does not change due to these incisions. Therefore, the performance degradation of the motor due to the change of the magnetic flux distribution can be minimized.

That is, according to the experiments of the present inventors, it can be seen that the maximum magnetic flux does not change due to these incisions. Therefore, the performance degradation of the motor due to the change of the magnetic flux distribution can be minimized. This will be described in detail with reference to the table shown in FIG. 7.

In FIG. 7, the present invention 1 is a compressor to which a motor comprising a conventional stator and a rotor according to the present invention described below is applied, and the present invention 2 is a compressor to which a motor consisting of a stator and a rotor according to the present invention is applied.

In the conventional general compressor shown in Figure 2, it can be seen that the efficiency of the motor is 82.5 and the efficiency (EER) of the compressor is 82.5. In addition, in the present invention 1 it can be seen that the efficiency of the motor is 83.7 and the efficiency (EER) of the compressor is 10.85. In addition, in the present invention 2 it can be seen that the efficiency of the motor is 83.4, the efficiency of the compressor is 10.80.

That is, it can be seen that due to the rotor according to the present invention to be described later, the efficiency of the conventional motor and the efficiency of the compressor are greatly increased. Detailed description thereof will be described later.

On the other hand, when comparing the present invention 1 and the present invention 2 it can be seen that a certain degree of efficiency degradation occurs by increasing the air cut area. As described above, it can be seen that the partial increase in the magnetic flux density is caused in large part. However, if one purpose is to make the efficiency of the compressor 10.80 or more, this reduction in efficiency is satisfactory.

In addition, it can be seen that the difference in efficiency of such a compressor is insignificant while the change in the amount of oil discharge is very large. That is, in the present invention, while the oil discharge amount is -30g, it can be seen that the oil discharge amount in the compressor of the present invention is 20g.

Here, the oil discharge amount is a difference in the oil weight before and after the cycle of the compressor once. That is, the negative oil discharge amount means the amount of oil that is not recovered because the oil is not circulated well. Therefore, according to the compressor of the present invention it can be seen that the circulation of the oil is made very smoothly.

This result is very effective. This is because the reduction of the efficiency of the motor and the compressor is minimized, but the function of the oil discharge is increased very effectively. Increasing the oil discharge function enables the smooth running and heat dissipation of the compressor mechanism, and the heat dissipation inside the compressor including the motor, thereby effectively increasing the reliability and durability. In addition, the smooth circulation of the oil can reduce the amount of oil contained in the refrigerant discharged.

On the other hand, these results can be obtained similar results in the motor and the compressor applying the stator according to the present invention in the conventional rotor. This is because the oil discharge amount of oil due to the change of the rotor hardly changes. Therefore, when the stator according to the present invention is combined with a conventional rotor, the reduction in efficiency will be minimal, but a very effective oil circulation will be possible.

Hereinafter, a method of winding the stator coil in the present invention will be described in detail with reference to FIG. 5.

As shown in FIG. 5, the slots formed at the right side of the flat cross section of the stator may be referred to as first through twenty-fourth slots along the clockwise direction. Therefore, it can be said that formed from the first slot to the 24th slot along the circumferential direction. That is, in the first slot, the twelfth slot is formed at the right side, and in the thirteenth slot, the twenty-fourth slot is formed at the left side. And both are symmetrical with respect to the longitudinal center axis.

In the stator, the main winding is wound such that different magnetic poles are formed on the left and right sides of the stator along the longitudinal center axis. The main windings are connected in series with each other, and the winding directions of the main windings are reversed.

First, the main coil is wound through the first slot and the twelfth slot. The main coil is wound in the order of the second and eleventh slots, the third and tenth slots, the fourth and ninth slots, and the fifth and eighth slots.

Here, the first slot and the twelfth slot are portions in which the magnetic pole is different between the thirteenth slot and the twenty-fourth slot of the upper portion. Therefore, it is preferable that the number of turns of the main coil at this boundary portion is larger than that of other places. In the second slot, it is preferable to have the same number of turns as the first slot. This is to make the stimulus generated in the main coil more clearly distinguished from the left and right. That is, to make the stimulus opposite at the stimulus boundary more clearly distinguishable.

In addition, as the slot number increases from the third slot to the fifth slot, the number of turns of the main coil is decreased. This is to secure a space in which the sub coil to be described later can be wound in such a slot, and to obtain an optimum starting torque performance and a static torque performance in a relationship between the main coil and the sub coil.

Therefore, it is preferable that the main coil is not wound around the sixth slot.

The sub coil is wound relative to the main coil so that the upper and lower portions are different magnetic poles based on the horizontal center axis of the flat section of the stator.

That is, the sub coil is wound over the sixth slot and the nineteenth slot. The sub coil is wound around the fifth slot, the 20th slot, the fourth slot, the 21st slot, and the third slot and the 22nd slot. Similarly, the sub coil is wound around the lower part so as to be symmetrical with the upper part.

Here, the sixth slot and the nineteenth slot are portions in which the magnetic poles are different between the seventh slot and the eighteenth slot. Therefore, it is preferable that the number of turns of the sub coils at this boundary portion is larger than that in other places. In addition, as the slot number is reduced from the fifth slot to the third slot (here, the reduced or symmetrical portion, for example, the twenty-second slot in the twenty-second slot), the number of turns of the main coil is preferably reduced.

In other words, it is preferable that the number of turns in the main coil or the sub coil does not increase from the boundary of the magnetic pole toward the center of the magnetic pole.

On the other hand, as described above, it is preferable that the first slot and the second slot are large slots, in which the main coil is wound to the maximum, and the sub coil is not wound. In addition, it is preferable that the sixth slot is a small slot, in which the sub coil is wound to the maximum, and the main coil is not wound.

The difference between the large and small slots and the maximum number of windings of the main coil and the sub coil is somewhat different because the role of the main coil and the role of the sub coil in the motor should be considered optimally.

In other words, the role of the sub coil is to generate torque auxiliary in relation to the main coil, if the role of the sub coil is large, it causes excessive waste of energy, on the contrary, in the small case, the torque is weak and fluid in the mechanical part of the compressor You will not be able to compress it.

Therefore, it is desirable to have such a difference for the optimal role of both.

As described above, only a main coil or a sub coil is wound in a specific slot, and both are wound together in a specific slot.

In general, the larger the area of the coil wound around the slot, the better the performance of the motor. Therefore, the ratio of the area occupied by the coils in the effective cross-sectional area of the single slot (the cross-sectional area excluding the area occupied by the insulating film and the safety gap with the air gap in the total slot cross-sectional area) is preferably 72% or more. However, this ratio is physically limited. In addition, the flux loss due to flux saturation must be taken into account. In this case, in order to prevent the magnetic flux saturation, the ratio in a specific slot is preferably 75% or less. In other words, the maximum magnetic flux density is preferably 1.78 or less.

In consideration of these matters, the main coil and the sub coil may be wound in the following aspects.

The main coil can be wound 30 times, 30, 18, 13 and 10 times from the first slot to the fifth slot, respectively, and the sub coils 30, 19, 15 from the sixth slot to the third slot, respectively. And it can be wound 10 times. Therefore, the main coil is wound 101 times in total and the sub coil is wound 74 times in total.

Therefore, the ratio of the total number of windings of the sub coil to the total number of windings of the main coil is preferably 0.70 to 0.75 in consideration of the variation in the number of windings of the main coil or the sub coil wound in a specific slot.

On the other hand, the compressor has various grades according to the refrigeration capacity, for example, there are a compressor having a refrigeration capacity of 7100 to 16300 Btu and a compressor of 11800 to 27500 Btu (for convenience, the former is called small and the latter is called medium). Therefore, the higher the refrigeration capacity of the compressor, the larger the capacity of the motor used.

Here, the stator outer diameter of the motor generally used for the compact compressor is substantially 112.0 and the stator outer diameter of the motor used for the medium compressor is substantially 121.7. However, the motor used in such a compressor is based on a motor using copper as a conductor material.

However, as described above, when copper is used as the conductor material, an increase in material price and weight inevitably result. Therefore, to solve this problem, according to the present invention, a material other than copper is used as the conductive material.

More specifically, the conductive material may be aluminum or an aluminum alloy. Here, aluminum or aluminum alloys are cheaper than copper and light in weight.

On the other hand, the aluminum material has a lower electrical conductivity than the copper material. The conductivity of copper is about 96% and that of aluminum is about 60%. Therefore, when the stator and the rotor have the same shape or size, the performance of the motor is inevitably caused by forming the stator coil from aluminum and copper. Therefore, it is very important to minimize this difference.

First, when aluminum is used as the lead material of the stator coil, it is possible to increase the wire diameter of the coil in order to obtain the desired motor performance. This is because the electric resistance in the coil decreases as the wire diameter increases. However, as the wire diameter increases, the number of turns of the coil that can be wound on the stator is inevitably reduced. Therefore, there will be a certain limit to increasing the diameter.

According to an embodiment of the present invention, wire diameters of the main coil and the sub coil using the core wire of aluminum are 1.1 and 0.9, respectively. The core is coated with enamel to form insulation. In addition, the coating thickness is preferably larger than that of the copper material. That is, in order to reinforce the fragility of the aluminum material in the coating portion to some extent, and to prevent the aluminum core wire from being cut.

Of course, the thickness of the wire diameter is larger than that of copper coils generally used in compressors of the same class.

In addition, when aluminum material is used as the lead material of the stator coil, it is possible to further increase the stack height of the stator in order to obtain desired motor performance. However, in this case, there will be a certain limit because the height of the overall motor must be increased.

On the other hand, in the case of using aluminum as a conductive material may cause problems in the winding process. This is because aluminum is less ductile than copper. That is, it can be easily taken and broken in the winding process. Therefore, it can be said that there is a high risk of defect, that is, disconnection during mass production.

Therefore, in the present invention, the compressor is compact as its embodiment, while the stator is preferably the size used for a medium compressor using conventional copper as the conductor material. That is, the outer diameter of the stator is substantially 121.7, and the capacity of the compressor in which such a motor is used is preferably small.

Here, it should be noted that the increase in cost incurred as the size of the stator increases is insignificant compared to the decrease in cost incurred by changing the material of the coil from copper to aluminum.

However, aluminum material has lower electrical conductivity than copper material. Therefore, in the present invention, the wire diameter of the stator coil is larger than that of a general copper material. However, there are certain limitations in consideration of the number of turns. Therefore, although the wire diameter of the coil is somewhat large, it means that the energy lost to the electrical resistance is higher in the case of aluminum. Therefore, when the stator coil is formed using the aluminum material, the heat generated from the stator coil is more than that using the copper material.

Therefore, there is a need to effectively dissipate such heat to satisfy the reliability and durability of the motor, as well as the reliability and durability of the compressor to which the motor is applied.

As described above, a method of further increasing the air cut area of the stator core as compared with the conventional method may be an effective way to satisfy this need. That is, because a larger amount of oil circulates in the compressor to effectively dissipate heat generated in the stator coils as well as the compression mechanism of the compressor.

Therefore, the present invention as described above can not only effectively enhance the reliability and durability of the motor and compressor by itself, but also more effectively enhance the reliability and durability of the motor and compressor in the case of forming the stator coil using aluminum material. Will be.

Hereinafter, the rotor of the motor according to the present invention will be described in detail.

As described above, the motor according to the present invention includes a motor applied to a compressor having a refrigeration capacity of 7100 to 16300 Btu. And one purpose is to make the efficiency of the motor is more than 83.0 or the efficiency of the compressor is more than 10.80. In addition, one object is to ensure that the maximum magnetic flux density generated in the motor is 1.78 T or less.

Thus, the rotor outer diameter of the motor according to the present invention may be substantially the same as the conventional rotor outer diameter. Therefore, the rotor of the motor according to the present invention will be described in detail with reference to the rotor shown in FIG.

As shown in FIG. 2, a general motor is formed to have a predetermined outer diameter d1 and includes a rotor having a plurality of slots formed in a circumferential direction on an outer side thereof in a radial direction.

Here, when the outer diameter d1 is 60.0 mm, it can be seen that the area of the entire slot is approximately 533.4. As shown in FIG. 7, the efficiency of the motor is 82.5, and the efficiency of the compressor to which the motor is applied is 10.4. In this case, it can be seen that the area of the entire slot of the rotor is approximately 533.4.

Accordingly, the rotor of the motor according to the present invention further increases the area of the entire slot in the rotor when the outer diameter is d1 and the same size as a conventional rotor. Of course, the outer diameter of the rotor of the motor according to the invention may have a certain deviation. However, the size of the rotor is inevitably dependent on the size of the stator, and the size of the stator is inevitably dependent on the size of the compressor. Therefore, there will be a certain deviation, but the size of the motor applied to the compressor having a refrigeration capacity of 11800 to 27500 but will not be excessively large in consideration of economy and efficiency. That is, for the purpose of the present invention to achieve a motor efficiency of 83.0 or more and a compressor efficiency of 10.80 or more physically the size of the motor will have a certain limit. Of course, even if the maximum magnetic flux density is to be 1.78 T or less, the size of the motor will be physically limited.

The slot of the rotor is important for the following reasons. The role of the slot 21 determines the secondary induced current value into the space where the conductor bar 22 is located. Therefore, this characteristic is very related to the characteristics of the motor. Here, the area of the slot determines the electrical resistance. That is, since the electrical resistance is inversely proportional to the area, the smaller the area of the slot, the larger the electrical resistance.

Therefore, the small area of the slot is advantageous for starting torque but very disadvantageous in terms of static torque and motor efficiency. Therefore, it is desirable to increase the area of the slot as much as possible when there is a margin in performance when starting the motor or starting the compressor. Of course, in this case, the saturation of the magnetic flux density should be prevented.

The rotor of the motor according to the present invention preferably has a slot area of 650 to 663 when its outer diameter d1 is 60.0. Since the outer diameter may have a certain deviation, it is preferable that the ratio of the area occupied by the entire slot 21 to the total area of the rotor by the outer diameter d1 of the rotor is 0.230 to 0.234.

On the other hand, in order to increase the slot area, the ratio d4 / d1 of the inner diameter d4 formed by the radially inner ends of the slot 21 to the outer diameter is preferably 0.692 to 0.708. That is, it is preferable that the d4 of the rotor according to the present invention is smaller than the conventional d4. This may increase the radial length of the slot, thereby increasing the area of each slot as a whole. This is because the outer diameter d4 formed by the radially outer ends of the slot has a certain limit to increase in consideration of d1. Therefore, the outer diameter d3 becomes equal to d1.

It is also possible to increase the width of the slot in order to increase the area of the slot. In this case, the width of the tooth 23, which is a width between the slots and the slots, becomes small. However, reducing the width of the tooth may cause magnetic flux saturation in the tooth portion. Therefore, the width t of the tooth 23 is increased rather than narrowing the width of the yoke 20 by decreasing d4. However, if the width t of the tooth is reduced too much, the area of the slot may be smaller than in the related art. Therefore, it is preferable to increase the width t of the teeth, but to have a ratio (t / d1) of 0.043 to 0.044 with respect to the outer diameter d1. For example, when d1 is 60.0, when the conventional t is 2.41, the t of the rotor according to the present invention is preferably 2.55 to 2.65.

In addition, it is preferable that 30 slots of the rotor according to the present invention are formed.

In the above example, the numerical value for determining the shape of the slot for the increase of the area on the premise of the increased area of the slot to achieve the above-described object has been described. On the contrary, however, the area of the increased slot may be determined based on a numerical value for determining the shape of the slot in order to achieve the above object.

As shown in Fig. 7, the efficiency of the conventional motor is 82.5 and the efficiency of the compressor is 10.4. In contrast, in the motor and the compressor (Invention 1) in which the rotor according to the present invention is coupled to the conventional stator, the efficiency of the motor is 83.7 and the efficiency of the compressor is 10.85. Therefore, according to the present invention 1 can achieve the object of the present invention and can be said to have a very enhanced and remarkable effect compared to the conventional motor and compressor. In addition, it can be seen that the motor and compressor (Invention 2) incorporating the rotor and the stator according to the present invention can similarly achieve the object of the present invention. Of course, according to the present invention 2 it is possible to provide a motor and a compressor in which the oil circulation in the compressor is very smooth and enhanced reliability and durability.

In addition, as shown in Figs. 3, 4 and 6, it can be seen that the maximum magnetic flux density does not exceed 1.78 T according to the present invention.

As a result, according to the present invention, it is possible to provide a motor and a compressor having much improved performance, durability, and reliability as compared with the related art.

Hereinafter, a compressor according to the present invention will be described in detail with reference to FIG. 8. Here, it will be preferred that the compressor is a rotary compressor.

As shown in FIG. 8, the compressor may be formed by an airtight container, in which case the airtight container may consist of a cylindrical case 3, an upper cover 4, and a lower cover 5.

A coolant inlet 10 is formed at one side of the case 3, and a coolant outlet 20 is formed at a central portion of the upper cover 4.

The above-described motors may be applied to the electric device unit 100 positioned above or below the sealed container. Here, the stator 1 is fixed to the inner wall of the cylindrical case (3).

Compressor mechanism 40 for compressing the refrigerant by the power by the power mechanism 100 may include a cylinder 45, bearings 42, 43, crankshaft 31, and rolling piston (36). have.

Here, the cylinder 45 forms a space in which the refrigerant is compressed, and is provided with an upper bearing 42 and a lower bearing 43 mounted on the upper and lower end surfaces of the cylinder, respectively. The bearings rotatably support the crankshaft 31 and at the same time serve to seal the space inside the cylinder 45.

The crankshaft 31 passes through the centers of the rotor 12 and the cylinder 45 of the motor, but may be rotated together with the rotor to transmit the rotational force generated by the power mechanism 100 to the compression mechanism 40. I can deliver it. Meanwhile, an eccentric portion 31a is formed at the lower portion of the crank shaft 31, and a rolling piston 36 is mounted to rotate the inside of the cylinder to compress the refrigerant so as to be covered on the outside of the eccentric portion.

Here, since the center of gravity of the rolling piston 36 and the center of rotation of the crankshaft 31 do not overlap each other, a main force of the compressor vibration is caused by unbalanced power when the rolling piston rotates at a high speed inside the compressor. Cause. In order to solve this problem, a balance 6 is usually provided at the upper end of the rotor to balance the moment. Unexplained reference numeral 2 is a stator coil.

As shown in FIG. 8, a large part of the compressor is occupied by the power transmission unit 100, that is, the motor. In addition, the motor is very heavy because it is made of most metals. Therefore, reducing the material cost of the motor and reducing its weight is very necessary compared to other home appliances.

To this end, in a compressor in which a motor is driven to compress the fluid, the motor includes a stator in which a stator coil is wound and a rotor rotated inside the stator.

The stator coil includes a main coil and a sub coil. In addition, the main coil and the sub-coil comprises an end coil which is positioned and fixed to the top and bottom in the stacking direction of the stator.

Here, the main coil is formed of aluminum material and is wound to form different magnetic poles on the left and right sides with respect to the longitudinal center axis of the flat section of the stator. The sub-coil is also made of aluminum and is wound to form different magnetic poles on the upper and lower sides with respect to the horizontal center axis of the flat cross section.

Through this, it is possible to reduce the material cost of the motor and the compressor to provide an economical compressor.

Meanwhile, as shown in FIG. 8, the height of the cylindrical case 3 is H0, the stacking height of the stator is H, and the uppermost end of the cylindrical case is located from the point where the top end surface of the stator is located inside the case 3. The distance to can be called d.

When the compressor is a compressor having a refrigeration capacity of 7100 to 16300 Btu, the d is preferably greater than the h. This is to ensure a proper space of the upper portion of the motor so that the compressed refrigerant is smoothly discharged. In addition, the circulation of the oil is intended to be appropriate.

In more detail, it is preferable that the ratio h / d of the height h to the distance d is 0.69 to 0.77. Increasing the ratio further implies that the compressor becomes excessively large, so that there is a certain limit. In addition, since the space in which the compressed refrigerant to be discharged is temporarily accommodated becomes too large, the compression efficiency may be adversely affected.

 In addition, there is a problem that the space is too small as described above to further lower the ratio, so that the compressed refrigerant cannot be discharged smoothly. In addition, this is to lower the height of the end coil relatively, there is a risk of damage to the end coil. This is because, unlike copper, aluminum has a relatively low ductility and is vulnerable to stamping and bending. Therefore, excessive pressure is applied to the end coil to lower the height of the end coil, which may damage the end coil. Therefore, it is preferable that the ratio (h / d) is 0.69 to 0.77.

On the other hand, the ratio of the height h of the end coil to the stack height H of the stator is preferably 0.30 to 0.35. That is, if the height ratio of the end coil to the stack height is large, there is a problem that the compressor has to be large, and in the opposite case, the end coil may be damaged. The stack height is preferably high considering the size of the compressor for optimum compressor performance.

In order to prevent damage of the end coil, not only the height of the end coil but also the thickness t1 of the radial width of the end coil. That is, increasing the thickness is preferable for preventing damage to the end coils due to immersion and bending, but damage to the end coils may occur due to the increase in the compressor and refrigerant or oil. Therefore, in consideration of the radial width of the end coil, it is preferable to first make the maximum outer diameter of the end coil smaller than the minimum outer diameter of the stator.

In addition, the minimum inner diameter of the end coil should maintain a safety distance from the air gap between the stator and the rotor. Therefore, it is preferable that ratio (t1 / h) of the thickness of the radial width of the end coil to the height of the end coil is 0.78 to 0.93.

1 is a cross-sectional view showing a conventional compressor;

FIG. 2 is a conceptual diagram schematically illustrating the rotor and stator coil of FIG. 1; FIG.

3 is a magnetic flux distribution diagram of the motor shown in FIG. 2;

4 is a magnetic flux distribution diagram of a virtual circular motor

5 is a plan sectional view of a stator of a motor according to the present invention;

6 is a magnetic flux distribution diagram of a motor according to the present invention;

7 is a performance comparison table of the conventional compressor and the present invention compressor;

8 is a cross-sectional view of a compressor according to the present invention.

** Explanation of symbols for main parts of drawings **

100: stator 111: York

113: tooth 114: vertical incision

115: horizontal incision 116: diagonal incision

121: large slot 122: small slot

Claims (20)

In a compressor in which a motor is driven including a stator on which a stator coil is wound and a rotor rotated on an inner shaft of the stator, thereby compressing fluid. The stator coil, A main coil formed of an aluminum material and wound to form different magnetic poles at a left side and a right side based on the longitudinal center axis of the stator plane cross-section; And And a sub coil formed of an aluminum material and wound to form different magnetic poles at an upper side and a lower side based on a horizontal center axis of the flat cross section. The method of claim 1, And a ratio of the total number of windings of the sub coil to the total number of windings of the main coil is 0.70 to 0.75. The method of claim 1, Compressor, characterized in that the stator is formed with 24 slots in which the stator coil is wound. The method of claim 3, wherein And two small slots each formed at the 3 o'clock and 9 o'clock directions of the flat cross section of the stator, wherein the small slot has a smaller cross-sectional area than other slots (large slots). The method of claim 4, wherein The total number of turns of the main coil is 101, Compressor characterized in that the total number of turns of the sub coil is 74. The method of claim 4, wherein When the slots formed at the right side of the planar cross section are named first to twelfth slots along the clockwise direction, respectively, Compressor, characterized in that as the slot number increases the number of turns of the main coil per slot does not increase. The method of claim 6, And the main coil is not wound in the sixth slot. The method of claim 6, And the number of windings of the main coils of the first slot and the second slot is the same, and as the slot number increases, the number of windings of the main coil per slot decreases. The method of claim 6, Compressor, characterized in that the number of turns of the sub coil per slot does not decrease as the slot number increases. The method of claim 9, And the sub coil is not wound around the first slot and the second slot. The method of claim 10, And the number of turns of the sub coils per slot increases as the slot number increases after the third slot. The method according to any one of claims 1 to 11, Compressor, characterized in that the maximum value of the magnetic flux density in the motor is less than 1.78T. The method according to any one of claims 1 to 11, Wherein the compressor has a refrigeration capacity of 7100 to 16300 Btu. The method according to any one of claims 1 to 11, In the stator, A vertical cutout cut in a vertical direction at both ends of a horizontal central axis of the flat cross section of the stator to form a passage for entering and exiting the fluid in the stacking direction of the stator; And And a horizontal cutout formed at both ends of the longitudinal central axis of the flat cross section to form a passage for entering and exiting the fluid in the stacking direction of the stator. The method of claim 14, In the stator, It is formed to be symmetrical with each other along the circumferential direction of the stator on the periphery of each quadrant of the stator with respect to the horizontal center axis of the flat cross-section, characterized in that the incision further formed for entering the fluid in the stacking direction of the stator Compressor. The method of claim 15, And a cutout formed in one quadrant of the stator is formed between the 1 o'clock and 2 o'clock directions with respect to the longitudinal center axis of the flat cross section. The method of claim 16, And a cutout formed in one quadrant of the stator is formed at an angle of between 37 degrees and 43 degrees in a clockwise direction with respect to the 12 o'clock direction of the longitudinal center axis. The method of claim 15, And the cutout is formed in the shape of a groove having a tangent of a predetermined length (L2) with respect to the center of the stator. The method of claim 18, And the ratio (L3 / D) of the radius (L3) to the tangential center to the outer diameter (D) of the stator is 0.481 to 0.486. The method of claim 18, Compressor, characterized in that the ratio (L2 / D) of the tangential length (L2) to the outer diameter (D) of the stator is 0.107 to 0.132.

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