WO2016090727A1 - Motor applied to rotary compressor and compressor having same - Google Patents

Abstract

A motor (100) applied to a rotary compressor and a compressor (200) having same. The motor comprises a stator (120) and a rotor (110). The stator comprises a stator iron core (121) and windings (130, 140, 150). The stator iron core is provided with a plurality of stator grooves (1211), and the windings are arranged in the stator grooves. Each stator groove only contains same-phase windings having the current in the same direction. The windings in each stator groove comprise first coils (131, 141, 151) and second coils (132, 142, 152). The end of each first coil and the end of each second coil are distributed in different stator grooves oppositely in the circumferential direction of the stator at certain pitch intervals.

Description

Electric motor for rotary compressor and compressor having the same Technical field

The present invention relates to the field of refrigeration equipment, and in particular to an electric motor for a rotary compressor and a compressor therewith.

Background technique

In current AC motors produced in large quantities, when the windings in the same slot are in phase, the winding ends in each slot are arranged as one winding and distributed in the same direction to the same stator slot. The winding ends are arranged such that the cross-sectional area of each winding is large. When the ends of the two-phase windings intersect, the interference space is large, and the outer windings need to have a large space for the inner windings. Set to a larger size to allow more end space for the inner winding during shaping.

At the same time, since the electrical resistance of the multi-phase winding of the motor is required to be symmetrical, the inner winding must also be set to have almost the same coil length as the outer winding to ensure the symmetry of the resistor. Therefore, both the outer and inner windings need to be set to a larger size, thereby increasing the winding end size and the resistance of each phase, thereby increasing the motor cost, reducing the motor efficiency, and further affecting the arrangement of the end space of the motor winding. .

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Accordingly, it is an object of the present invention to provide an electric motor for a rotary compressor which has the advantages of small winding end size, low cost, and high efficiency.

Another object of the present invention is to provide a compressor having an electric motor as described above.

An electric motor for a rotary compressor according to an embodiment of the first aspect of the present invention includes: a stator; and a rotor provided inside the stator, the stator including a stator core and a winding, the winding being a distributed winding, the stator core is provided with a plurality of stator slots, the windings are disposed in the stator slots, and the same stator slots contain only in-phase windings of the same direction current, and the same in the stator slots The winding includes a first coil and a second coil, the ends of the first coil and the ends of the second coil being distributed in opposite stator pitches in different circumferential pitches in different circumferential pitches.

An electric motor for a rotary compressor according to an embodiment of the present invention, by dividing a winding in the same stator slot into a first coil and a second coil, the ends of the first coil and the ends of the second coil are along the circumference of the stator The directions are opposite, distributed to different stator slots at a certain pitch. Thereby, the interference space when the two-phase windings cross is effectively reduced, and the interference is reduced. The outer winding needs to be provided with a escaping space, thereby reducing the size of the winding end, thereby shortening the total length of the winding, reducing the resistance of the winding, saving production materials, thereby improving the efficiency of the motor and reducing The cost of the motor.

According to an example of the invention, the number of slots per phase per pole is one.

According to an example of the invention, the number of turns of the first coil of the winding is substantially equal to the number of turns of the second coil.

According to an example of the invention, the length of the first coil of the winding is greater than the length of the second coil.

According to an example of the invention, the first coils of different phases are each placed outside the second coil in the radial direction of the stator.

According to an example of the invention, the first coil length is substantially equal to the second coil length.

According to an example of the invention, the first coil and the second coil of the same phase are disposed on the same side of the other phase windings in the radial direction of the stator.

According to an example of the invention, the rotor is a permanent magnet rotor or a squirrel cage rotor.

According to an example of the invention, the electric motor has a multi-phase winding.

A compressor according to an embodiment of the second aspect of the present invention includes the electric motor for a rotary compressor according to the above-described first aspect of the present invention.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a schematic view showing a winding structure of an electric motor for a rotary compressor according to an embodiment of the present invention;

2 is a schematic end cross-sectional view showing a winding of an electric motor for a rotary compressor according to an embodiment of the present invention;

3 is a schematic end cross-sectional view showing a winding of an electric motor for a rotary compressor according to another embodiment of the present invention;

4 is a schematic view showing a winding structure of an electric motor for a rotary compressor according to another embodiment of the present invention;

Figure 5 is a schematic structural view of an electric motor for a rotary compressor according to an embodiment of the present invention;

Figure 6 is a schematic structural view of an electric motor for a rotary compressor according to another embodiment of the present invention;

Figure 7 is a schematic cross-sectional view of a compressor in accordance with one embodiment of the present invention.

Reference mark:

Electric motor 100,

Rotor 110,

Stator 120, stator core 121, stator slot 1211,

Phase A winding 130, phase A first coil 131, phase A second coil 132,

Phase B winding 140, Phase B first coil 141, Phase B second coil 142

Phase C winding 150, phase C first coil 151, phase C second coil 152,

Compressor 200,

Crankshaft 210, main bearing 220, cylinder 230, piston 240, sub-bearing 250, housing 270.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are intended to be illustrative of the invention and are not to be construed as limiting.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Out, Clockwise, Counterclockwise, Axial The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the present invention and simplifying the description, and does not indicate or imply the indicated device or The elements must have a particular orientation, are constructed and operated in a particular orientation and are therefore not to be construed as limiting. Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. In the description of the present invention, "a plurality" means two or more unless otherwise stated.

In the description of the present invention, it should be noted that the terms "installation", "connected", and "connected" are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or integrally connected; can be mechanical or electrical; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of the two components. The specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.

An electric motor 100 for a rotary compressor according to an embodiment of the present invention will be described in detail below with reference to Figs. It is to be noted that FIG. 5 is a schematic structural view of an electric motor for a rotary compressor according to an embodiment of the present invention, wherein the electric motor 100 may be an 18-slot 6-pole permanent magnet motor; FIG. 6 is a perspective view of the present invention. A schematic structural view of an electric motor for a rotary compressor according to another embodiment, wherein the electric motor 100 may be a 12-slot 4-pole squirrel cage motor.

As shown in FIGS. 1 to 6, an electric motor 100 for a rotary compressor according to an embodiment of the present invention includes a rotor 110 and a stator 120.

Specifically, the rotor 110 is provided inside the stator 120. The stator 120 may include a stator core 121 and windings, and the windings may be distributed windings. The stator core 121 is provided with a plurality of stator slots 1211. The windings are disposed in the stator slots 1211. The same stator slots 1211 contain only in-phase windings of the same direction current. That is, the flow of current in the windings in the same stator slot 1211 is the same. The windings in the same stator slot 1211 include a first coil and a second coil, and the ends of the first coil and the ends of the second coil are distributed in different stator slots 1211 at opposite pitches along the circumferential direction of the stator 120. .

For example, as shown in FIGS. 1 and 4, the windings may include an A-phase winding 130, a B-phase winding 140, and a C-phase winding 150. The A-phase winding 130 includes an A-phase first coil 131 and an A-phase second coil 132. The A-phase first coil 131 and the A-phase second coil 132 are protruded from the stator slot 1211a, and the A-phase first coil 131 is reversed. The hour hand extends into the stator slot 1211b in the counterclockwise direction of the stator slot 1211, and the second phase A coil 132 extends in the clockwise direction into the stator slot 1211c in the clockwise direction of the stator slot 1211. Similarly, the B-phase winding 140 includes a B-phase first coil 141 and a B-phase second coil 142, and the C-phase winding 150 includes a C-phase first coil 151 and a C-phase second coil 152, a B-phase winding 140 and a C-phase winding 150. They are all distributed in the same way.

In the related art, when the windings in the same stator slot are in-phase windings, the ends of the in-phase windings in each stator slot are arranged as one coil, and are distributed in the same direction to the corresponding stator slots. When the ends of the two-phase windings intersect, the interference space is large, and the outer windings need to reserve a large space for the inner windings, so the outer windings need to be set to a larger size, so as to set the inner windings during shaping. More end space.

An electric motor 100 for a rotary compressor according to an embodiment of the present invention, by dividing a winding in the same stator slot 1211 into a first coil and a second coil, an end portion of the first coil and an end portion of the second coil The stators 120 are distributed in opposite circumferential directions at different pitches into different stator slots 1211. Thereby, the interference space when the two-phase windings intersect is effectively reduced, the escaping space that the outer winding needs to be disposed is reduced, thereby reducing the size of the winding ends, thereby shortening the total length of the windings and reducing the windings. The resistance saves the production material, thereby improving the efficiency of the motor 100 while reducing the cost of the motor 100.

As shown in Figures 5 and 6, in accordance with an embodiment of the present invention, the rotor 110 can be a permanent magnet rotor or a squirrel cage rotor. For example, as shown in FIG. 5, the motor 100 may be a permanent magnet motor; for example, as shown in FIG. The motivation 100 can also be a squirrel cage motor. Thereby, the range of use of the rotor 110 is improved.

Additionally, the motor 100 can have multi-phase windings. Thereby, the winding can be applied to different types of motors 100, thereby expanding the range of application of the windings. For example, the motor 100 may have a two-phase winding, a three-phase winding, a four-phase winding, or a six-phase winding, and the like. For convenience of description, the structure of the motor 100 for a rotary compressor according to an embodiment of the present invention will be described below with the motor 100 having a three-phase winding as an example.

As shown in FIGS. 1 and 4, the windings may include an A-phase winding 130, a B-phase winding 140, and a C-phase winding 150. The A-phase winding 130 includes an A-phase first coil 131 and an A-phase second coil 132. The A-phase first coil 131 and the A-phase second coil 132 are protruded from the stator slot 1211a, and the A-phase first coil 131 is reversed. The hour hand extends into the stator slot 1211b in the counterclockwise direction of the stator slot 1211, and the second phase A coil 132 extends in the clockwise direction into the stator slot 1211c in the clockwise direction of the stator slot 1211. Similarly, the B-phase winding 140 includes a B-phase first coil 141 and a B-phase second coil 142, and the C-phase winding 150 includes a C-phase first coil 151 and a C-phase second coil 152, a B-phase winding 140 and a C-phase winding 150. They are all distributed in the same way.

As shown in FIGS. 1 to 6, the number of slots per phase per motor of the motor 100 is one. It should be noted that the number of slots of the stator slot 1211 and the number of poles of the rotor 110 are basic parameters of the motor 100. For example, the windings are divided into an A-phase winding 130, a B-phase winding 140, and a C-phase winding 150, for example, each phase. The number of slots occupied in the stator 120 is equal, one third each. Corresponding to each of the magnetic poles of the rotor 110, the number of slots of each phase corresponding to the occupied stator slots 1211 at each magnetic pole is also equal. The number of slots per phase per pole, that is, the number of slots occupied by each pole under each pole:

q=Z/(2pm)

Where: Z is the total number of slots of the stator slot 1211;

2p is the number of magnetic poles;

m is the number of phases.

It can be seen from the equation that when q is an integer, the winding is called an integer slot winding; when q is a fraction, the winding is called a fractional winding. If q=1, it means that under one magnetic pole, the three phases A, B and C occupy one stator slot 1211 in each of the stator slots 1211. For example, as shown in FIG. 5, the motor 100 of FIG. 5 is an 18-slot 6-pole permanent magnet motor 100 having a number of slots per phase per phase; as shown in FIG. 6, the motor 100 is 12 slots in FIG. The 4-pole squirrel cage motor 100 has a number of slots per phase per pole. It has been experimentally verified that when the number of slots per phase per phase of the motor 100 according to the embodiment of the present invention is 1, the motor 100 has the best performance and the highest working efficiency.

As shown in Figures 1-4, the number of turns of the first coil of the winding is substantially equal to the number of turns of the second coil. For example, the total number of turns of the A-phase winding 130 is 55, the number of turns of the first coil 131 of the A-phase can be 27, and the number of turns of the second coil 132 of the A-phase can be 28. It can be understood that the number of turns of the first coil 131 of the A phase and the number of turns of the second coil 132 of the A phase are not limited thereto, as long as the total number of turns of the A phase first coil 131 and the A phase second coil 132 does not change. can. Same Ground, the number of turns of the first coil of the B phase in the B phase winding is substantially equal to the number of turns of the second coil of the B phase; the number of turns of the first coil of the C phase in the phase C winding and the number of turns of the second coil of the C phase are also Almost equal.

In one embodiment of the invention, as shown in Figure 2, the length of the first coil of the winding is greater than the length of the second coil. Thereby, the end winding end size can be further shortened, thereby further improving the performance of the motor 100 and reducing the cost of the motor 100. Further, the first coil in each of the in-phase windings is located outside of the second coil. Thereby, the in-phase windings can be arranged in a certain order.

As shown in FIG. 2, in the radial direction of the stator core 121, each of the A-phase windings 130 to C-phase windings 150 is located radially outward of each of the second coils. Thereby, the in-phase windings can be arranged in a certain order. As shown in FIG. 2, the A-phase first coil 131, the B-phase first coil 141, and the C-phase first coil 151 are both located outside the A-phase second coil 132, the B-phase second coil 142, and the C-phase second coil 152. . Preferably, the length of the A-phase first coil 131, the B-phase first coil 141, and the C-phase first coil 151 is greater than any one of the A-phase second coil 132, the B-phase second coil 142, and the C-phase second coil 152. The length of the A-phase second coil 132, the B-phase second coil 142, or the C-phase second coil 152 can be further shortened, thereby shortening the size of the in-phase winding end portion, thereby further improving the efficiency of the motor 100 and reducing the cost of the motor 100.

Of course, the arrangement of the windings, the length relationship of the first coil and the second coil are not limited thereto, and for example, in another embodiment of the present invention, the first coil length is substantially equal to the second coil length. Thereby, the same phase windings are disposed substantially in the same layer, and the shortening of the end portion size ensures that the coil is more easily and conveniently embedded in the stator slot 1211, and the insulating material is more easily disposed, so that the motor 100 has excellent manufacturability. Further, the first coil and the second coil of the same phase are radially disposed along the stator 120 on the same side of the other phase windings. In other words, the first coil and the second coil of the one-phase winding are located on the same side of the first coil and the second coil in the other phase windings in the radial direction of the stator core 121. Thereby, in shortening the winding end size, it is simpler and more convenient to ensure that the winding is embedded in the stator slot 1211, and it is easier to provide the insulating material, so that the motor 100 has excellent manufacturability.

As shown in FIG. 3, in the radial direction of the stator core 121, the A-phase winding 130 is disposed on the radially outermost side, the C-winding is disposed on the radially innermost side, and the B-phase winding 140 is disposed on the A-phase winding 130 and the C-phase winding 150. The distance between the first coil in each phase winding and the central axis of the stator core 121 is substantially equal to the distance of the second coil from the central axis of the stator core 121. Thereby, the same winding is disposed substantially in the same layer, and the length of the end portion is shortened, and the coil is inserted into the stator slot 1211 to be simpler and more convenient, and the insulating material is more easily disposed, so that the motor 100 has excellent manufacturability. For example, as shown in FIG. 3, the distance between the A-phase first coil 131 and the central axis of the stator core 121 is substantially equal to the distance between the A-phase second coil 132 and the central axis of the stator core 121. Similarly, the distance between the B-phase first coil 141 and the central axis of the stator core 121 and the distance between the B-phase second coil 142 and the central axis of the stator core 121 are the same, and the C-phase first coil 151 and the stator core 121 are Center axis distance and phase C The distance between the two coils 152 and the central axis of the stator core 121 is equal.

A compressor 200 according to an embodiment of the present invention will be described in detail below with reference to FIG.

As shown in FIG. 7, a compressor 200 according to an embodiment of the present invention includes a housing 270, a compression mechanism, and an electric motor 100 as described above. The compression mechanism is disposed in the housing 270. The compression mechanism includes a main bearing 220, a cylinder 230, a sub-bearing 250, a crankshaft 210, a piston 240, and a slide (not shown). The main bearing 220 is disposed at the top of the cylinder 230, and the pair The bearing 250 is disposed at the bottom of the cylinder 230. The main bearing 220, the sub-bearing 250 and the cylinder 230 define a compression chamber. The power output end of the motor 100 is connected to the crankshaft 210. The crankshaft 210 extends through the main bearing 220, the cylinder 230 and the sub-bearing 250. The crankshaft 210 has an eccentric portion, the eccentric portion is located in the compression chamber, the piston 240 is sleeved on the eccentric portion, and the cylinder 230 is formed with a radially extending sliding groove, the sliding piece is movably disposed in the sliding groove, and is sliding The inner end of the sheet abuts against the outer peripheral wall of the piston 240.

According to the compressor 200 of the embodiment of the invention, by dividing the windings in the same stator slot 1211 into the first coil and the second coil, the ends of the first coil and the ends of the second coil are opposite in the circumferential direction of the stator 120 And distributed to different stator slots 1211 at a certain pitch. Thereby, the interference space when the two-phase windings intersect is effectively reduced, the escaping space that the outer winding needs to be disposed is reduced, thereby reducing the size of the winding ends, thereby shortening the total length of the windings and reducing the windings. The resistance saves the production material, thereby improving the efficiency of the motor 100 while reducing the cost of the motor 100.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples", etc. Particular features, structures, materials or features described in the examples or examples are included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

While the embodiments of the present invention have been shown and described, the embodiments of the invention may The scope of the invention is defined by the claims and their equivalents.

Claims (10)

An electric motor for a rotary compressor, comprising: Stator; and a rotor, the rotor is disposed inside the stator, the stator includes a stator core and a winding, the winding is a distributed winding, the stator core is provided with a plurality of stator slots, and the winding is disposed at the In the stator slot, the same stator slot contains only in-phase windings of the same direction current, and the windings in the same stator slot include a first coil and a second coil, the end of the first coil and the The ends of the second coil are distributed to different stator slots at opposite pitches in the circumferential direction of the stator. The electric motor for a rotary compressor according to claim 1, wherein the number of slots per phase per pole is one. The electric motor for a rotary compressor according to claim 1, wherein a number of turns of said first coil of said winding is substantially equal to a number of turns of said second coil. The electric motor for a rotary compressor according to claim 1, wherein a length of said first coil of said winding is greater than a length of said second coil. The electric motor for a rotary compressor according to claim 4, wherein said first coils of different phases are disposed radially outward of said second coil in the stator. The electric motor for a rotary compressor according to claim 1, wherein said first coil length is substantially equal to said second coil length. The electric motor for a rotary compressor according to claim 6, wherein said first coil and said second coil of the same phase are disposed on the same side of the other phase windings in the radial direction of the stator. The electric motor for a rotary compressor according to any one of claims 1 to 7, wherein the rotor is a permanent magnet rotor or a squirrel cage rotor. An electric motor for a rotary compressor according to any one of claims 1 to 8, wherein the electric motor has a multi-phase winding. A compressor comprising the electric motor for a rotary compressor according to any one of claims 1-9.

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