KR20090080197A - Motor and a Compressor including the same - Google Patents

Abstract

A motor and a compressor including the same are provided to minimize problems due to redesign of a compressor by minimizing a change of a composition of the compressor due to the redesign of the compressor. A motor includes a stator and a rotor(200). The rotor has a predetermined external diameter. A plurality of slots(221) are formed along a circumferential direction in an outside of an radius direction. The rotor is rotated in an inside of a stator. A ratio of an inside diameter of the slots to the external diameter of the rotor is 0.661 to 0.662. A ratio of the entire area of the slots to the entire area of the rotor due to the external diameter of the rotor is 0.296 to 0.297. The entire area of the slots to the external diameter of 60 is 837.87 to 840.51.

Description

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

The present invention relates to a motor and a compressor using the same, and more particularly, to a motor and a compressor having improved efficiency, reliability, and durability.

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.

In such a compressor, the motor forms the core of a power mechanism for compressing the fluid, through which power is transmitted to the compression mechanism to compress the fluid in the compression mechanism.

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 recommended for the stator, and as the current is applied to the coil, the rotor rotates with respect to the stator.

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.

Compressor equipped with a motor according to the prior art, as shown in Figures 1 to 2, is composed of a compression mechanism unit and the electric drive unit for driving it in the compression tube (1).

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 has a substantially circular cross-section having a predetermined outer diameter 2b, and an air cut 14 having a portion thereof cut out is formed outside the stator. 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.

In addition, the stator is fixed through a fixing groove or a positioning groove 15 formed in the air cut 14 in the compressor, more specifically, as shown in FIG. 1, as shown in FIG. 1.

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.

On the other hand, Applicant produces a rotary compressor having a refrigeration capacity of 7100 to 16300 Btu, and also produces a motor used in the compressor. Here, the outer diameter of the stator of the motor is approximately 112.04 mm, and the outer diameter of the rotor is approximately 55 mm.

In this compressor, the efficiency of the motor is 86.3%, the performance of the compressor (EER) is 10.2, and the maximum torque (static torque) is 53.5 kgf.cm.

Therefore, the necessity of developing a motor that exhibits high efficiency and high power as compared to the above-mentioned motor naturally arises. In addition, the need to develop a compressor with increased efficiency by applying such a motor also arises naturally.

The design of the rotor is also very important for improving the motor's characteristics.

As shown in FIG. 2, the role of the slot 21 determines the secondary induced current value into the space where the conductor bar 22 is located, and this characteristic is related to the characteristic of the motor. In addition, as described above, the width of the tooth 23 and the width of the yoke 20 are preferably designed such that the magnetic flux density does not saturate into the space in which the magnetic flux flows. This is because the loss occurs as the magnetic flux saturates. Of course, the excessive magnetic flux density also causes a problem in that the size of the rotor increases, so the determination of the tooth width and the yoke width is also important.

Here, the tooth width means a distance between neighboring slots 21, and the yoke width is a diameter d4 formed by radially inner ends of the slot 21 minus the diameter d2 of the shaft hole through which the shaft is press-fitted. It means the interval. Meanwhile, although not shown, when the outer diameter of the rotor is d1, the diameter formed by the radially outer ends of the slot 21 may be referred to as d3. Here, d3 is generally smaller than d1. This is because aluminum can leak out of the rotor radially when molded. However, in the case where the conductor bar 22 is pressed into the slot 21, the d3 may be the same as d1. In this way, the radial length of the slot will correspond to the length of d3 minus d4. Thus, the width of the slot will be smaller as the tooth width increases, and the length of the slot will be larger as d3 is increased or d4 is decreased. In addition, the shape and area of the slot 21 may be determined according to the tooth width and the slot length.

However, in the above-described conventional motor, the efficiency and the static torque performance are disadvantageous due to the small area of the slot. In addition, there is a disadvantage in terms of efficiency of the compressor due to the limitation of the motor performance.

The present invention basically aims to solve the above problems.

More specifically, an object of the present invention is to provide a high efficiency and high output motor and a compressor using the same.

In addition, an object of the present invention is to provide a high efficiency and high output motor and a compressor using the same without changing the overall size of the conventional motor. .

In addition, an object of the present invention is to minimize the configuration changes of the compressor due to the redesign of the motor to minimize the problems associated with the compressor redesign.

In order to achieve the above object, the present invention includes a stator, and a rotor formed to have a predetermined outer diameter (D5) and a plurality of slots are formed in the circumferential direction on the radially outer side to be rotated in the stator. In the motor made, the ratio of the inner diameter (D8) of the plurality of slots to the outer diameter (D5) of the rotor provides a motor, characterized in that 0.661 to 0.662.

Here, the ratio of the total slot area formed by the plurality of slots to the total area of the rotor by the outer diameter D5 may be 0.296 to 0.297. And when the outer diameter is 60, the total slot area is preferably 837.87 to 840.51.

Meanwhile, the motor may be used in a compressor having a refrigeration capacity of 7100 to 16300 Btu.

In order to achieve the above object, the present invention also provides a compressor in which a motor is driven to compress a refrigerant to exhibit a refrigeration capacity of 7100 to 16300 Btu, wherein the motor is formed to have a stator and a predetermined outer diameter D5 and is radially outer A plurality of slots are formed in the circumferential direction to include a rotor provided to rotate inside the stator, and the efficiency (%) of the motor is 87.0 or more and the efficiency of the compressor is 10.3 or more. The ratio of the inner diameter D8 of the plurality of slots to the outer diameter D5 of the rotor is 0.661 to 0.662.

Here, the static torque represented by the motor is 53.6 or more, and the ratio of the total slot area formed by the plurality of slots to the total area of the rotor by the outer diameter D5 is 0.296 to 0.297. And when the outer diameter is 60, the total slot area is preferably 837.87 to 840.51.

On the other hand, the maximum magnetic flux density appearing in the motor is preferably 1.75 or less, and the ratio of the inner diameter D2 of the stator to the outer diameter D1 of the stator is preferably 0.54.

The stator coil may include a mail coil wound around the left and right sides of the stator coil to form different magnetic poles based on the longitudinal center axis of the stator plane; And a sub coil wound to form different magnetic poles on the upper and lower sides with respect to the horizontal center axis of the planar cross section.

At this time, 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 has a smaller cross-sectional area than other slots (large slots).

Here, the ratio of the outer diameter D3 of the slots to the outer diameter D1 of the stator is 0.767 to 0.772, and the ratio of the outer diameter D4 of the small slots to the outer diameter D1 of the stator is 0.743. It is preferable that it is-0.747.

On the other hand, the present invention is a compressor in which the motor is driven to compress the refrigerant to exhibit a refrigeration capacity of 7100 to 16300 Btu, wherein the motor is formed to have a stator and a predetermined outer diameter (D5) and a plurality of radially outwards along the circumferential direction The rotor is formed to include a slot is formed to rotate in the interior of the stator, in order to ensure that the efficiency (%) of the motor is at least 87.0, the efficiency of the compressor is at least 10.3 and the static torque is at least 53.6, The ratio of the inner diameter D8 of the plurality of slots to the outer diameter D5 of the rotor is 0.661 to 0.662, and the ratio of the inner diameter D2 of the stator to the outer diameter D1 of the stator is 0.54. Provide a compressor.

In addition, the present invention is a compressor in which the motor is driven to compress the refrigerant to show a refrigeration capacity of 7100 to 16300Btu, wherein the motor is formed to have a stator and a predetermined outer diameter (D5) and a plurality of radially outwards along the circumferential direction And a rotor having a slot formed to rotate in the stator, and the maximum magnetic flux density appearing in the motor is 1.75 or less and the static torque is 53.6 or more to satisfy the outer diameter D5 of the rotor. The ratio of the inner diameter D8 of the plurality of slots is 0.661 to 0.662, and the ratio of the slot outer diameter D3 of the stator to the outer diameter D1 of the stator is 0.767 to 0.772.

According to the present invention can basically solve the problems of the conventional motor and compressor.

More specifically, according to the present invention can provide a high efficiency and high output motor and a compressor using the same.

In addition, according to the present invention can provide a high efficiency and high output motor and a compressor using the same without changing the overall size of the conventional motor.

In addition, according to the present invention it is possible to minimize the configuration changes of the compressor due to the redesign of the motor to minimize the problems associated with the compressor redesign.

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

Here, the embodiment according to the present invention is applied to a compressor having a refrigeration capacity of 7100 to 16300 Btu. Therefore, the conventional motor described herein refers to a motor applied to a compressor according to the present invention and the compressor having an external size of substantially the same and having a refrigeration capacity of 7100 to 16300 Btu. In addition, the motor size is based on mm unless otherwise stated, and the torque unit is based on kgf.cm. The area unit is based on mm ² .

In addition, the same structure as the conventional one is not described separately.

For convenience of explanation, the rotor of the motor according to the present invention will be described first, and then the stator of the motor according to the present invention will be described.

The motor according to the present invention is to provide a high efficiency and high output of the motor as compared to the conventional motor and to provide a high efficiency compressor. Therefore, according to the motor and the compressor according to the present invention, there is provided a motor and a compressor exhibiting an improved effect than the efficiency and output of the above-described motor and the efficiency of the compressor.

Therefore, when the refrigeration capacity of the compressor according to the present invention is 7100 to 16300 Btu, one purpose is that the efficiency (EER) of the compressor is 10.3 or more higher than 10.2. In addition, the purpose of the motor used in such a compressor is to be 87.0 or more higher than 86.3, and the static torque is 53.6 or more higher than 53.5.

On the other hand, it is one object that the maximum magnetic flux density generated in the motor according to the present invention is 1.75 T or less. This is because the saturation level of the magnetic flux density is 1.75 T due to the characteristics of the steel, which is the material of the rotor and the stator. However, it is another object of the present invention to provide a motor having a maximum magnetic flux density of 1.80 T or less in the simulation because it is larger than the measured magnetic flux density.

The rotor of the motor according to the present invention will be described in detail with reference to FIG. 3.

As shown in FIG. 3, the rotor 200 is formed to have a predetermined outer diameter D5 and includes a plurality of slots 221 formed along the circumferential direction on the radially outer side.

Conventional rotors have a rotor outer diameter of 55 and the total slot area substantially represents 451.11. The performance of conventional motors and compressors having such rotors has been described above.

The rotor of the motor according to the invention further increases the area of the entire slot in the 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 7100 to 16300 Btu will not be excessively large in consideration of economy and efficiency. That is, in order to achieve the objects to be achieved in the present invention, the size of the motor will be physically limited. Of course, even if the maximum magnetic flux density is to be 1.75 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 221 determines the secondary induced current value into the space where the conductor bar 222 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. Through this, it is possible to increase the performance of the motor and the efficiency of the compressor.

In the rotor of the motor according to the present invention, when the outer diameter D5 is 60.0, it is preferable that the total area formed by the plurality of slots is 837.87 to 840.51.

Here, the outer diameter (D5) of the rotor is assuming that the stator outer diameter of the motor according to the present invention is 112.04. That is, it is assumed that the stator outer diameter is fixed as in the prior art. This is to prevent the problem of changing the conventional compressor configuration because the size of the motor, in particular the compressor (in particular, the compression tube, see 1 in FIG. 1) to accommodate the stator outer diameter is changed. Therefore, in order to further increase the area of the entire slot, it is not desirable to make the outer diameter of the rotor 60.0 or more. This is because if the outer diameter of the rotor is increased while the outer diameter of the stator is fixed, the yoke width of the stator is inevitably narrowed. Therefore, when the yoke width is narrowed, the loss due to the magnetic flux saturation cannot be ignored.

However, the outer diameter of the rotor and the outer diameter of the stator are an embodiment of the present invention, and these values may be relatively changed. Therefore, the ratio of the area occupied by the entirety of the plurality of slots 221 to the total area of the rotor by the outer diameter D5 of the rotor is preferably 0.296 to 0.297.

On the other hand, in order to increase the slot area, the ratio D8 / D5 of the inner diameter D8 formed by the radially inner ends of the slot 221 to the outer diameter D5 is preferably 0.661 to 0.662. This may increase the radial length of the slot, thereby increasing the area of each slot as a whole.

In addition to increasing the radial length of the slot, not only by increasing the outer diameter D7 formed by the radially outer ends of the slot (which is increased by increasing D5), but also by reducing the inner diameter D8. It is possible. However, in this case, since the width of the yoke 220 of the rotor is reduced, there is a certain limit in consideration of the magnetic flux saturation. In addition, in order to increase the width of the yoke 220, the inner diameter (D6) of the rotor should be reduced. Considering the strength of the shaft (5, see FIG. 1), there is a certain limit in reducing the inner diameter (D6) of the rotor. Of course, in order to use the conventional shaft as it is, the inner diameter (D6) of the rotor is preferably to be the same as the conventional.

In addition, it is preferable that 33 slots of the rotor according to the present invention are formed.

In this case, the length of the circumferential width of the slot can be increased to increase the area of the slot. However, this inevitably narrows the tooth width (distance between slots) of the rotor and may cause magnetic flux saturation in this area. Therefore, it is not desirable to increase the length of the circumferential width of the slot.

In the above example, dimensions for determining the shape of the slot for the increase of the area (for example, outer diameter D5 of the rotor, slot outer diameter D7, and Slot inner diameters (D8)). On the contrary, however, the area of the increased slot may be determined on the premise of determining the shape of the slot in order to achieve the above object.

On the other hand, when increasing the slot area of a rotor as mentioned above, starting torque performance falls. In general, in the motor receiving 220V AC power, the voltage value at the initial startup should be 170V or less. This starting torque refers to the torque at the start of operation in the stationary state, which is evaluated by the lowest cold starting test of the compressor, that is, the voltage value at the initial starting at a temperature lower than room temperature. Here, the torque is inversely proportional to the square of the voltage.

However, the starting torque voltage value in the above-mentioned conventional motor represents 130V. Therefore, even when increasing the slot area of the rotor satisfies the required 170V or less, there is no problem due to the deterioration of starting torque performance.

On the contrary, by increasing the slot area of the rotor in the motor according to the present invention, it is possible to improve the efficiency of the motor and compressor due to a simple structure change or redesign. The increase in efficiency cannot be overemphasized. Further, according to the present invention, the static torque, that is, the maximum torque can be enhanced. The static torque is a measure of how much an overload can withstand when the mechanism of the compressor is overloaded by external influences. Therefore, according to the present invention, it is possible to provide a motor and a compressor capable of normal operation even under overload, thereby increasing reliability.

Hereinafter, the stator of the motor according to the present invention will be described. 4 is a plan sectional view of the stator of the motor according to the present invention.

As shown in FIG. 4, the shape of the stator 100 may be represented by an outer diameter D1, an inner diameter D2, and a slot outer diameter D3 of the stator. Here, the slot outer diameter D3 may be the outer diameter of the large slot 112, in which case the outer diameter of the small slot 112 'may be referred to as D4.

Here, the stator is formed in a substantially circular shape, wherein the outer diameter of the circular is D1, a predetermined portion is cut for the air cut 114 and the groove 115 for fixing the stator in the circumferential direction of the stator In part, a portion having an outer diameter smaller than D1 is formed.

As described above, in the embodiment according to the present invention, the outer diameter D1 is preferably substantially the same as the prior art. This is because the configuration of the compressor is not significantly changed.

However, when the inner diameter of the conventional stator is 56.0, the inner diameter D2 in this embodiment is preferably 61.0. That is, it is preferable to leave an allowance of 1 mm in the outer diameter D5 of the rotor so that the air gap becomes 0.5 mm as a whole.

First, the inner diameter D2 is maximally expanded so that the outer diameter D5 of the rotor can be maximized. However, there is a possibility that magnetic flux saturation may occur in the stator yoke portion due to the expansion of the inner diameter, and thus there is a limit.

Therefore, the ratio of the inner diameter D2 of the stator to the outer diameter D1 of the stator is preferably 0.54. This is higher than conventional 0.50.

Due to the increase in the inner diameter, the slot outer diameter D3 becomes larger, and the ratio of the slot outer diameter D3 to the outer diameter D1 is preferably 0.767 to 0.772. This is higher than the previous ratio of 0.75.

Here, if the slot outer diameter D3 is large and the outer diameter D1 of the stator is fixed, the yoke widths D1-D3 of the stator become substantially smaller. Therefore, there is a fear that magnetic flux saturation may occur as the yoke width becomes narrower.

Therefore, the slot outer diameter D3 is preferably extended only to the extent that magnetic flux saturation does not occur, and 0.772 denotes such a critical point.

Similarly, if the small slot 112 'as well as the large slot 112 is formed, the small slot outer diameter D4 also increases as compared with the conventional, and the ratio of the small slot outer diameter D4 to the outer diameter D1 is 0.743 to 0.747. Is preferred. This means that it is increased than the conventional 0.71.

On the other hand, the width of the yoke 111 near the small slot becomes larger than the width of the yoke near the large slot. However, as will be described later, the air cut 114 is formed near the small slot. In addition, the air cut is preferably secured to the maximum that no magnetic flux saturation occurs. Thus, the yoke width in the vicinity of the small slot 112 ′ is preferably made substantially the same as the yoke width in the vicinity of the large slot 112.

5 is a magnetic flux distribution diagram simulating a magnetic flux distribution in a motor according to the present invention. In addition, the magnetic flux distribution diagram is a magnetic flux distribution diagram during normal operation. Hereinafter, for convenience of description, the horizontal central axis directions of the plane illustrated in FIG. 5 will be referred to as the 3 o'clock direction and the 9 o'clock direction, respectively, and the vertical central axis directions will be referred to as the 12 o'clock direction and the 6 o'clock direction, respectively. That is, the same as the clockwise direction.

Although not shown in FIG. 5, the stator coil is wound so 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 vertical hemisphere. 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 and the right hemisphere of the flat cross section, the sub coils will be wound in the upper and lower hemispheres of the flat cross section.

Therefore, as shown in FIG. 5, it can be seen that when the main coil and the sub coil are both excited, the magnetic flux density appears to be the largest. In this case, the stator is near 3 o'clock and 9 o'clock, and the rotor 12 o'clock. It can be seen that the magnetic flux density is highest in the vicinity and around 6 o'clock.

Here, the highest magnetic flux density appearing in the rotor is 1.75 T, which may be acceptable considering that the magnetic flux saturation threshold is 1.8 T in simulation. In addition, the highest magnetic flux density appearing on the stator is 1.80 T, which is also acceptable.

Here, the maximum magnetic flux density is generated in the stator at the 3 o'clock and 9 o'clock directions because the incision is formed at the radially distal end portion so that the yoke width of the stator is narrower than the other portions. That is, this is because as many parts as possible are cut to secure the air cut, and as shown in FIG. 5, the threshold is 0.938 of the ratio of the width L0 of the air cut 114 to the outer diameter D1 of the stator. have. For example, if the outer diameter D1 of the stator is 112.04, the width L0 of the air cut represents 105.1.

Therefore, when the width of the air cut exceeds the above ratio, a loss due to magnetic flux saturation occurs in the air cut portion. Therefore, the width of the cutout portion should be 105.1 to ensure maximum air cut and to prevent magnetic flux saturation. However, if the need for securing air cuts is rather low, the width of the incision may be greater than 105.1 to further reduce the concern of magnetic flux saturation. That is, the ratio of L0 to D1 may be greater than 0.938.

Meanwhile, as described above, a small slot is formed in the cutout portion, and FIG. 3 shows an example in which 20 small slots and four 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 ') will be forced to relatively less winding stator coil, but as described above, the sub-coil is wound so that different poles are formed on the upper and lower sides based on the small slot, so the performance of the motor There is no big change.

In addition, the main slot is not wound around the small slot 122 ′, and only the sub coil is wound, thereby preventing magnetic flux saturation near the small slot. This is because the magnetic flux generated by the sub coil is smaller than that of the main coil.

On the other hand, as shown in Figures 4 and 5, it is preferable that the fixing groove or positioning groove 115 for fixing the stator to the compressor is not formed in the 3 o'clock and 9 o'clock directions of the stator. That is, it is preferable that such grooves 115 are not formed in the substantially middle portion of the air cut 114. This results in the groove 15 being formed in the middle portion of the air cut 14 portion as shown in FIG. 1, which actually further narrows the width of the state yoke in the air cut 114 portion.

However, in the stator of the motor according to the present invention, the air cut 114 is maximized, but since the inner diameter of the stator is expanded, it is not preferable to form the groove 115 in this portion in consideration of the magnetic flux saturation. Therefore, the stator 100 of the motor according to the present invention, it is preferable that such a groove 115 is formed in the end portion of the air cut 114 substantially. Here, the portions in which the grooves 115 are formed are upper and lower portions of the highest magnetic flux density in the stator, as shown in FIG. 5, and may be referred to as approximately 2 o'clock, 4 o'clock, 8 o'clock and 10 o'clock directions. . Therefore, it is possible to minimize the increase in the magnetic flux density due to this groove 115, there is an effect that can further secure the air cut.

As shown in FIG. 5, the experiments of the present inventors show that the magnetic flux saturation level is satisfactory due to the design of the air cut 114, the stator 100, and the rotor 200. Therefore, the performance degradation of the motor due to the change in the magnetic flux distribution can be minimized, and it is possible to exhibit the optimum effect as compared with the conventional motors and compressors. This will be described in detail with reference to the table shown in FIG. 6.

In the conventional general compressor shown in FIG. 1, the efficiency of the motor is 86.3 and the efficiency EER of the compressor is 10.2. In addition, it can be seen that the efficiency of the motor in the present invention is 87.8 and the efficiency (EER) of the compressor is 10.4. In addition, the conventional static torque is 53.5, it can be seen that the static torque in the present invention is 53.7.

Therefore, it can be seen that the improved performance is very effective in terms of the efficiency of the motor, the efficiency of the compressor and the static torque according to the present invention. In consideration of the use environment and experimental error of the motor and the compressor, it can be seen that at least the efficiency of the motor according to the present invention is 87.0 or more, the efficiency of the compressor is 10.3 or more, and the static torque is 53.6 or more.

1 is a cross-sectional view of a compressor;

2 is a plan sectional view of a typical motor;

3 is a plan sectional view of a rotor of a motor according to the present invention;

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

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

6 is a performance comparison table of the conventional compressor and the compressor according to the present invention.

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

100: stator 111: York

113: Tee 114: Aircut

122: large slot 122 ': small slot

200: rotor 221: slot

Claims (18)

In the motor comprising a stator and a rotor formed to have a predetermined outer diameter (D5) and a plurality of slots are formed in the circumferential direction outside the radial direction to be rotated in the stator, And a ratio of an inner diameter (D8) of the plurality of slots to an outer diameter (D5) of the rotor is 0.661 to 0.662. The method of claim 1, The ratio of the total slot area of the plurality of slots to the total area of the rotor by the outer diameter (D5) is 0.296 to 0.297. The method according to claim 1 or 2, And wherein when the outer diameter is 60, the total slot area is 837.87 to 840.51. The method of claim 3, wherein The rotor of the rotor is characterized in that the 33 is formed. The method of claim 3, wherein Wherein the motor is used in a compressor having a refrigeration capacity of 7100 to 16300 Btu. A compressor in which a motor is driven to compress a refrigerant so that a refrigeration capacity is 7100 to 16300 Btu, The motor includes a stator and a rotor which is formed to have a predetermined outer diameter D5 and a plurality of slots are formed in a circumferential direction on an outer side in a radial direction, and is provided to rotate in the stator. The ratio of the inner diameter D8 of the plurality of slots to the outer diameter D5 of the rotor is 0.661 to 0.662 so that the efficiency (%) of the motor is 87.0 or more and the efficiency of the compressor is 10.3 or more. Compressor made. The method of claim 6, Compressor characterized in that the static torque represented by the motor is 53.6 or more. The method of claim 6, The ratio of the total slot area of the plurality of slots to the total area of the rotor by the outer diameter (D5) is 0.296 to 0.297. The method according to any one of claims 6 to 8, And the total slot area is 837.87 to 840.51 when the outer diameter is 60. The method according to any one of claims 6 to 8, Compressor, characterized in that the maximum magnetic flux density appearing on the motor is less than 1.75. The method of claim 10, The ratio of the inner diameter (D2) of the stator to the outer diameter (D1) of the stator is 0.54. The method of claim 11, The stator is characterized in that the compressor is characterized in that the 24 slots are wound around the stator coil is formed. The method of claim 12, The stator coil, A mail coil wound around the left and right sides of the stator flat cross section to form different magnetic poles; And And a sub coil wound to form different magnetic poles at an upper side and a lower side with respect to the horizontal center axis of the planar cross section. The method of claim 13, 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 14, And the ratio of the outer diameter (D3) of the slots to the outer diameter (D1) of the stator is 0.767 to 0.772. The method of claim 14, The ratio of the outer diameter (D4) of the small slots to the outer diameter (D1) of the stator is 0.743 to 0.747. A compressor in which a motor is driven to compress a refrigerant so that a refrigeration capacity is 7100 to 16300 Btu, The motor includes a stator and a rotor which is formed to have a predetermined outer diameter D5 and a plurality of slots are formed in a circumferential direction on an outer side in a radial direction, and is provided to rotate in the stator. The ratio of the inner diameter D8 of the plurality of slots to the outer diameter D5 of the rotor is such that the efficiency (%) of the motor is at least 87.0, the efficiency of the compressor is at least 10.3, and the static torque is at least 53.6. Is 0.661 to 0.662, and the ratio of the inner diameter D2 of the stator to the outer diameter D1 of the stator is 0.54. A compressor in which a motor is driven to compress a refrigerant so that a refrigeration capacity is 7100 to 16300 Btu, The motor includes a stator and a rotor which is formed to have a predetermined outer diameter D5 and a plurality of slots are formed in a circumferential direction on an outer side in a radial direction, and is provided to rotate in the stator. In order to satisfy the maximum magnetic flux density of 1.75 or less and the static torque of 53.6 or more, the ratio of the inner diameter D8 of the plurality of slots to the outer diameter D5 of the rotor is 0.661 to 0.662, and the stator Compressor, characterized in that the ratio of the slot outer diameter (D3) of the stator to the outer diameter (D1) of 0.767 to 0.772.

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