Compressor, single-phase induction motor and stator thereof, refrigeration cycle device

Abstract

The present invention proposes a stator, a single-phase induction motor, a compressor and a refrigeration cycle device. The stator includes: a stator core, a main winding and an auxiliary winding. The stator core has a plurality of stator slots. The main winding and the auxiliary winding both include multi-layer coils wound in the stator slots to form two poles of the corresponding windings. The two poles of the main winding and the two poles of the auxiliary winding are orthogonally distributed. The number of stator slots is 28, the number of coil layers per pole of the main winding / the number of stator slots is km, the number of coil layers per pole of the auxiliary winding / the number of stator slots is ka, and 1 / 14<ka≤1 / 7<km<3 / 14 is satisfied; the fundamental wave winding coefficient of the main winding is gm, the fundamental wave winding coefficient of the auxiliary winding is ga, and 0.805<gm<0.873<ga<0.969 is satisfied. #imgabs0##imgabs1##imgabs2##imgabs3#of each layer of coil is set by setting a new number of stator slots and winding coil layers, so that the winding coefficient of the motor is high, the winding end is short, the copper loss is low, and the efficiency of the motor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and more specifically, to a stator of a single-phase induction motor for a compressor, a single-phase induction motor for a compressor, a compressor, and a refrigeration cycle device. Background Art

[0002] In the compressor used in refrigeration devices such as air conditioners, the driving component in the compressor is an electric motor, which is usually a brushless DC motor or an induction motor.

[0003] For compressors using single-phase induction motors, the single-phase induction motors generally include: a stator winding composed of a main winding and an auxiliary winding connected in series with a running capacitor at a coil angle of 90 degrees from the main winding, and the rotor is generally a squirrel cage cast aluminum structure. The number of stator slots of existing single-phase induction motors is generally 20, 24, etc., which is an outdated design and cannot improve the working efficiency of the motor. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a stator of a single-phase induction motor for a compressor, which has a high winding coefficient, short winding ends, low copper loss, and improved efficiency of the motor by setting a new number of stator slots and winding coil layers.

[0005] The present invention also provides a single-phase induction motor, a compressor and a refrigeration cycle device having the stator.

[0006] According to the first aspect of the present invention, the stator of a single-phase induction motor for a compressor includes: a stator core, a main winding and an auxiliary winding, the stator core has a plurality of stator slots, the main winding and the auxiliary winding both include multi-layer coils wound in the stator slots to form two poles of the corresponding windings, and the two poles of the main winding are orthogonally distributed with the two poles of the auxiliary winding.

[0007] The number of stator slots is 28, the number of coil layers / stator slots of each pole of the main winding is km, the number of coil layers / stator slots of each pole of the auxiliary winding is ka, and satisfies 1 / 14<ka≤1 / 7<km<3 / 14; the fundamental wave winding coefficient of the main winding is gm, the fundamental wave winding coefficient of the auxiliary winding is ga, and satisfies 0.805<gm<0.873<ga<0.969.

[0008] in,

[0009] Compared with the existing structure with 20 or 24 stator slots, the stator of the embodiment of the present invention increases the number of stator slots by setting the number of stator slots to 28, thereby reducing the stator harmonic magnetic field, reducing additional losses, and reducing harmonic leakage reactance; at the same time, the number of winding layers of the stator and the arrangement of the windings are optimized, so that the winding coefficient of the motor is high, the winding end is short, the copper loss is low, and the efficiency of the motor is improved.

[0010] The number of layers of each pole of the main winding is five, the number of layers of each pole of the auxiliary winding is four, and the following conditions are satisfied: 0.805<gm<0.873<ga<0.928.

[0011] The number of layers of each pole of the main winding is five, the number of layers of each pole of the auxiliary winding is three, and the following conditions are satisfied: 0.805<gm<0.873, 0.928<ga<0.969.

[0012] The main winding is closer to the slot bottom of the stator slot than the auxiliary winding.

[0013] Each pole of the main winding is composed of x layers of coils, and the first layer of coils to the xth layer of coils are distributed in sequence from the outermost to the innermost side, and the number of stator teeth contained between the two stator slots into which the first layer of coils to the xth layer of coils are inserted are Ym1, Ym2, ..., Ymx, respectively, where Q / 2>Ym1>Ym2>...>Ymx, and Q is the number of stator slots.

[0014] Each pole of the auxiliary winding is composed of y layers of coils, and the first layer of coils to the yth layer of coils are distributed in sequence from the outermost to the innermost side, and the number of stator teeth contained between the two stator slots into which the first layer of coils to the yth layer of coils are inserted are Ya1, Ya2, ..., Yay, respectively, where Q / 2>Ya1>Ya2>...>Yay, and Q is the number of stator slots.

[0015] Ym1=Ya1=13, in two adjacent layers of coils, the number of stator teeth included between the two stator slots into which the outer coil is inserted minus the number of stator teeth included between the two stator slots into which the inner coil is inserted=2.

[0016] According to the second aspect of the present invention, a single-phase induction motor for a compressor comprises the stator; and a rotor, wherein the rotor comprises a rotor core and a secondary conductor, wherein the rotor core is rotatably disposed in the stator core, the rotor core comprises a plurality of rotor slots, and the secondary conductor is disposed in the rotor slots.

[0017] The width of the rotor slot gradually decreases from the outside to the inside. The rotor slot is pear-shaped and closed.

[0018] The secondary conductor has an aluminum rod and an end ring electrically connected to each other, the aluminum rod having a spiral section.

[0019] The rotor slots of the rotor core are subjected to a secondary bluing treatment, wherein the secondary bluing treatment includes a first bluing treatment before the rotor core is die-cast with aluminum liquid and a second bluing treatment after the rotor core is die-cast.

[0020] A compressor according to an embodiment of the third aspect of the present invention comprises the single-phase induction motor for the compressor.

[0021] A refrigeration cycle device according to an embodiment of the fourth aspect of the present invention comprises the above-mentioned compressor.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 The single-phase induction motor for a compressor, the compressor, and a refrigeration cycle device equipped with the compressor according to an embodiment of the present invention are schematic diagrams.

[0025] Figure 2 It is a cross-sectional view of a winding method of a single-phase induction motor according to an embodiment of the present invention.

[0026] Figure 3 It is a cross-sectional view of another winding method of the single-phase induction motor according to an embodiment of the present invention.

[0027] Explanation of symbols

[0028] 1- stator; 2- rotor; 1a- stator core; 1b- stator slot; 2a- rotor core; 2b- rotor slot; 2c- driving shaft; 2d- aluminum rod; 20a- main winding; 20b- auxiliary winding; S1~S28: stator slot number; 100- single-phase induction motor; 200- compressor; 300- refrigeration cycle device. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar units or units with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] Reference below Figures 1 to 3 A single-phase induction motor 100 for a compressor and a stator 1 thereof according to an embodiment of the present invention are described.

[0031] Figure 1 1 is a schematic diagram of a single-phase induction motor 200 for a compressor, a compressor 200, and a refrigeration cycle device 300 equipped with the compressor according to an embodiment of the present invention. The compression component of the compressor 200 and the circulation component of the refrigeration cycle device 300 equipped with the compressor 200 are not improved structures of the present application and will not be discussed in detail here.

[0032] The single-phase induction motor 100 for the compressor 200 according to the embodiment of the present invention comprises: a stator 1 and a rotor 2, wherein the stator 1 comprises: a stator core 1a, a main winding 20a and an auxiliary winding 20b, wherein the stator core 1a has a plurality of stator slots 1b, wherein the main winding 20a and the auxiliary winding 20b both comprise a multilayer coil wound in the stator slots 1b to form two poles of the corresponding winding, wherein the two poles of the main winding 20a and the two poles of the auxiliary winding 20b are orthogonally distributed. The rotor 2 comprises a rotor core 2a and a secondary conductor, wherein the rotor core 2a is rotatably disposed in the stator core 1a, wherein the rotor core 2a comprises a plurality of rotor slots 2b, and the secondary conductor is disposed in the rotor slots 2b.

[0033] Different from the existing structure, the stator 1 adopts the following design: the number of stator slots 1b is 28. On this basis, the applicant has made creative efforts and found that the design of the number of coil layers of the main winding 20a and the auxiliary winding 20b, the number of stator slots 1b, and the coil arrangement (involving the selection of parameters such as the number of turns of each layer of coils, the number of teeth contained between the stator slots 1b into which each layer of coils is inserted) will have a significant impact on the efficiency of the motor.

[0034] To this end, the following design is carried out: the number of coil layers / stator slots 1b of each pole of the main winding 20a is defined as km, and the number of coil layers / stator slots 1b of each pole of the auxiliary winding 20b is defined as ka, and km and ka satisfy 1 / 14<ka≤1 / 7<km<3 / 14; the fundamental-wave winding coefficient of the main winding 20a is gm, and the fundamental-wave winding coefficient of the auxiliary winding 20b is ga, and they satisfy 0.805<gm<0.873<ga<0.969.

[0035] In this way, since the auxiliary winding 20b is connected in series with a running capacitor, its harmonic content can be appropriately higher than the main winding 20a. Correspondingly, the number of winding layers under each pole of the auxiliary winding 20b is lower than the number of winding layers under each pole of the main winding 20a to ensure that the harmonic content of the auxiliary winding 20b is not too high. At the same time, the fundamental wave winding coefficient of the auxiliary winding 20b can be made higher than the fundamental wave winding coefficient of the main winding 20a, which can balance the winding losses of the main winding 20a and the auxiliary winding 20b, so that the winding loss of the motor is low.

[0036] According to the stator 1 of the embodiment of the present invention, by increasing the number of stator slots 1b, the number of stator slots 1b is set to 28, so that the harmonic magnetic field of the stator 1 is reduced, the additional loss is reduced, and the harmonic leakage reactance is small; at the same time, the number of winding layers of the stator 1 and the arrangement of the windings are optimized, so that the winding coefficient of the motor is high, the winding end is short, the copper loss is low, and the efficiency of the motor is improved.

[0037] It should be noted that the fundamental wave winding coefficients of the main winding 20a and the auxiliary winding 20b are defined by the following formula:

[0038]

[0039] The fundamental wave winding coefficient gm of the main winding 20a and the fundamental wave winding coefficient ga of the auxiliary winding 20b are described in detail below:

[0040] (1) The fundamental wave winding coefficient gm of the main winding 20a is defined in the following manner:

[0041] Each pole of the main winding 20a is composed of x layers of coils, from the outermost to the innermost of the x layers of coils are the first layer of coils, the second layer of coils, ..., the xth layer of coils. The number of stator teeth contained between the two stator slots 1b inserted by the first layer of coils is Ym1, the number of stator teeth contained between the two stator slots 1b inserted by the second layer of coils is Ym2, ..., and so on. The number of stator teeth contained between the two stator slots 1b inserted by the xth layer of coils is Ymx.

[0042] The numbers of turns of the first to x-th coils of the main winding 20 a are M1 , M2 , . . . , Mx respectively.

[0043] The effective factors of the fundamental wave generated by the first coil layer of each pole of the main winding 20a to the effective factors of the fundamental wave generated by the x-th coil layer are Xm1, Xm2, ..., Xmx, respectively, where

[0044]

[0045] (2) The fundamental wave winding coefficient ga of the auxiliary winding 20b is defined in the following manner:

[0046] Each pole of the auxiliary winding 20b is composed of y layers of coils, from the outermost to the innermost of the y layers of coils are the first layer of coils, the second layer of coils, ..., the yth layer of coils. The number of stator teeth contained between the two stator slots 1b inserted by the first layer of coils is Ya1, the number of stator teeth contained between the two stator slots 1b inserted by the second layer of coils is Ya2, ..., and so on. The number of stator teeth contained between the two stator slots 1b inserted by the yth layer of coils is Yay.

[0047] The numbers of turns of the first to y-th coil layers of the auxiliary winding 20 b are A1, A2, . . . , Ay, respectively.

[0048] The fundamental wave effective factors generated by the first layer coil of each pole of the auxiliary winding 20b to the fundamental wave effective factors generated by the yth layer coil are Xa1, Xa2, ..., Xay respectively, where

[0049]

[0050] In some embodiments, the coils of the main winding 20a and the auxiliary winding 20b may be arranged in the following manner:

[0051] Each pole of the main winding 20a is composed of x layers of coils, and the first layer of coils to the xth layer of coils are sequentially distributed from the outermost to the innermost side, and the number of stator teeth included between the two stator slots 1b into which the first layer of coils to the xth layer of coils are inserted is Ym1, Ym2, ..., Ymx, respectively, wherein Q / 2>Ym1>Ym2>…>Ymx, and Q is the number of stator slots 1b. Each pole of the auxiliary winding 20b is composed of y layers of coils, and the first layer of coils to the xth layer of coils are sequentially distributed from the outermost to the innermost side, and the number of stator teeth included between the two stator slots 1b into which the first layer of coils to the xth layer of coils are inserted is Ya1, Ya2, ..., Yay, respectively, wherein Q / 2>Ya1>Ya2>…>Yay, and Q is the number of stator slots 1b. Furthermore, Ym1=Ya1=13, and in two adjacent layers of coils, the number of stator teeth included between the two stator slots 1b into which the outer coil is inserted minus the number of stator teeth included between the two stator slots 1b into which the inner coil is inserted=2.

[0052] Specifically, Ym1, Ym2, ..., Ymx can be selected from the following data in descending order: 13, 11, 9, 7, 5, 3, 1. When the number of stator slots 1b is set to 28, as the number of winding layers increases, the fundamental wave effective factor corresponding to each layer of coils under each pole shows a decreasing trend. The fundamental wave effective factors of each layer of coils of the main winding 20a and the auxiliary winding 20b under each pole are respectively:

[0053]

[0054]

[0055] Accordingly, it can be concluded that the winding utilization rate corresponding to the layer where the winding with a low fundamental wave effective factor is located decreases.

[0056] In the embodiment of the present invention, the number of layers under each pole of the main winding 20a is set to five, ensuring that the fundamental wave effective factor of each layer of coil under each pole is greater than 0.5, which can improve the fundamental wave winding coefficient of the motor. At the same time, the number of layers of the auxiliary winding 20b is set to four or three layers, so that the fundamental wave winding coefficient of the auxiliary winding 20b is higher than the fundamental wave winding coefficient of the main winding 20a, which can balance the winding losses of the main winding 20a and the auxiliary winding 20b, so that the winding loss of the motor is low.

[0057] When the number of coil layers under each pole of the main winding 20a is further reduced, for example, the number of coil layers under each pole of the main winding 20a is set to four layers, although the winding coefficient of the main winding 20a can be further improved, the increase in harmonic content causes a sharp increase in stray losses and a significant deterioration in motor efficiency.

[0058] Since the auxiliary winding 20b is connected in series with a running capacitor, its harmonic content can be appropriately higher than that of the main winding 20a. Correspondingly, the number of coil layers under each pole of the auxiliary winding 20b can be lower than that of each pole of the main winding 20a. At the same time, in order to ensure that the harmonic content of the auxiliary winding 20b is not too high, the number of coil layers under each pole of the auxiliary winding 20b is set to three or four layers.

[0059] In some embodiments, the number of layers of each pole of the main winding 20a is five, the number of layers of each pole of the auxiliary winding 20b is four, and the following conditions are satisfied: 0.805<gm<0.873<ga<0.928. In other words, the number of layers / slots of each pole of the main winding 20a km=5 / 28, the number of layers / slots of each pole of the auxiliary winding 20b ka=1 / 7, 0.805<the fundamental wave winding coefficient gm of the main winding 20a<0.873, 0.873<the fundamental wave winding coefficient ga of the auxiliary winding 20b<0.928.

[0060] Specifically, the number of layers of each pole of the main winding 20a is five, and the number of coil layers of each pole of the auxiliary winding 20b is four. Then the fundamental wave winding coefficients gm and ga of the main winding 20a and the auxiliary winding 20b are set as:

[0061]

[0062] That is, 0.805<gm<0.873<ga<0.928.

[0063] In this case, the fundamental-wave winding coefficient gm of the main winding 20a is set to be greater than the case where there are five layers of windings under each pole and the number of turns of each layer of coils is the same (for example, assuming that the number of turns of each layer of coils is 1 turn), and less than the case where there are four layers of windings under each pole and the number of turns of each layer of coils is the same (for example, assuming that the number of turns of each layer of coils is 1 turn).

[0064] The fundamental-wave winding coefficient ga of the auxiliary winding 20b is set to be greater than the case where the windings under each pole are four layers and the number of turns of each layer of coils is the same (for example, assuming that the number of turns of each layer of coils is 1 turn), and less than the case where the windings under each pole are three layers and the number of turns of each layer of coils is the same (for example, assuming that the number of turns of each layer of coils is 1 turn).

[0065] In other embodiments, the number of layers of each pole of the main winding 20a is five, the number of layers of each pole of the auxiliary winding 20b is three, and the following conditions are satisfied: 0.805<gm<0.873, 0.928<ga<0.969. In other words, the number of layers / slots of each pole of the main winding 20a km=5 / 28, the number of layers / slots of each pole of the auxiliary winding 20b ka=3 / 28, 0.805<the fundamental wave winding coefficient gm of the main winding 20a<0.873, 0.928<the fundamental wave winding coefficient ga of the auxiliary winding 20b<0.969.

[0066] Specifically, the number of layers of each pole of the main winding 20a is five, and the number of layers of each pole of the auxiliary winding 20b is three. Then the fundamental wave winding coefficients gm and ga of the main winding 20a and the auxiliary winding 20b are set as:

[0067]

[0068] That is, 0.805<gm<0.873, 0.928<ga<0.969.

[0069] In this case, the fundamental wave winding coefficient gm of the main winding 20a is set to be greater than the value when the winding under each pole is five layers and the number of turns of each coil is the same (for example, assuming that the number of turns of each coil is 1 turn), and less than the value when the winding under each pole is four layers and the number of turns of each coil is the same (for example, assuming that the number of turns of each coil is 1 turn). The fundamental wave winding coefficient ga of the auxiliary winding 20b is set to be greater than the value when the winding under each pole is three layers and the number of turns of each coil is the same (for example, assuming that the number of turns of each coil is 1 turn), and less than the value when the winding under each pole is two layers and the number of turns of each coil is the same (for example, assuming that the number of turns of each coil is 1 turn).

[0070] In this way, the fundamental wave winding coefficients of the main winding 20a and the auxiliary winding 20b are set respectively, so that the winding coefficient of the motor is higher, the winding arrangement is more reasonable, and the winding end is shorter.

[0071] Optionally, the main winding 20a is closer to the bottom of the stator slot 1b than the auxiliary winding 20b. In this way, the main winding 20a is wound first and then the auxiliary winding 20b, making the winding process easier.

[0072] The refrigeration cycle device 300 according to the fourth embodiment of the present invention comprises the compressor 200 of the above embodiment. By using the compressor 200 equipped with the above single-phase induction motor 100 for refrigeration cycle, the performance of the refrigeration cycle device 300 can be improved, and the device can be miniaturized and low-priced. Figure 2 and Figure 3 The motors of several specific embodiments of the present invention are described in detail. The above description is applicable to the first to fifth embodiments described below, and will not be repeated here.

[0073] First embodiment

[0074] like Figure 2 As shown, the motor 100 includes a stator 1 fixed to a main body of a sealed container of a compressor 200 and a rotor 2 rotating inside the stator 1 .

[0075] The rotor 2 is a squirrel cage structure made of cast aluminum, and the drive shaft 2c is fixed to the inner circumference of the rotor 2. The rotor 2 is composed of a rotor core 2a and a secondary conductor, and the secondary conductor is composed of an aluminum rod 2d and an end ring. Both ends of the aluminum rod 2d are electrically connected to the two end rings to form an integral squirrel cage structure. The secondary structure is an existing structure, which is fully understood by professionals in this field and will not be discussed in detail here.

[0076] The rotor core 2a is manufactured by punching electromagnetic steel sheets having a thickness of 0.1 to 1.5 mm into a predetermined shape and stacking them in the axial direction.

[0077] Figure 2 and Figure 3 The stator 1 shown is used for a single-phase induction motor 100 having two poles (for example, two poles of an N pole and an S pole).

[0078] The stator 1 includes a stator core 1a, a main winding 20a and an auxiliary winding 20b inserted into a stator slot 1b. The main winding 20a and the auxiliary winding 20b together form a winding.

[0079] Figure 2 and Figure 3 The main winding 20a is firstly wound in the deep of the stator slot 1b, and the auxiliary winding 20b is wound after the main winding 20a is wound. Of course, the present invention is not limited to this. In other embodiments, the auxiliary winding 20b may be firstly wound in the deep of the stator slot 1b, and the main winding 20a is wound after the auxiliary winding 20b is wound.

[0080] In order to ensure insulation between the winding and the stator core 1a, an insulating material may be inserted into the stator slot 1b. Figure 2 and Figure 3 Not shown.

[0081] The number of stator slots 1b is 28, from slots S1 to S28. The stator core 1a is manufactured by punching electromagnetic steel sheets having a thickness of 0.1 mm to 1.5 mm into a predetermined shape, laminating them in the axial direction, and fixing them by riveting or welding.

[0082] If the number of layers / slots per pole of the main winding 20a is set to km, and the number of layers / slots per pole of the auxiliary winding 20b is set to ka, multiple layers are wound within the range of 1 / 14<ka≤1 / 7<km<3 / 14.

[0083] exist Figure 2 In the specific embodiment shown, the number of layers of each pole of the main winding 20a is five, and the number of layers of each pole of the auxiliary winding 20b is four. The coil angle of the main winding 20a and the auxiliary winding 20b is 90 degrees.

[0084] The two poles of the main winding 20a and the auxiliary winding 20b are respectively referred to as a first pole and a second pole. Figure 2 In the specific embodiment shown, the winding method and number of turns of the main winding 20a and the auxiliary winding 20b are as follows:

[0085] The first layer coil of the first pole of the main winding 20a is wound 63 turns on the stator slots 1b S1 and S14.

[0086] The second layer coil of the first pole of the main winding 20a is wound around the stator slots 1b S2 and S13 by 63 turns.

[0087] The third layer coil of the first pole of the main winding 20a is wound 63 turns on the stator slots 1b S3 and S12.

[0088] The fourth layer coil of the first pole of the main winding 20a is wound 34 turns on the stator slots 1b S4 and S11.

[0089] The fifth layer coil of the first pole of the main winding 20a is wound 17 turns on the stator slots 1b S5 and S10.

[0090] The first layer coil of the second pole of the main winding 20a is wound around the stator slots 1b S15 and S28 by 63 turns.

[0091] The second layer coil of the second pole of the main winding 20a is wound around the stator slots 1b S16 and S27 by 63 turns.

[0092] The third layer coil of the second pole of the main winding 20a is wound 63 turns on the stator slots 1b S17 and S26.

[0093] The fourth layer coil of the second pole of the main winding 20a is wound around the stator slots 1b S18 and S25 by 34 turns.

[0094] The fifth layer coil of the second pole of the main winding 20a is wound 17 turns on the stator slots 1b S19 and S24.

[0095] The number of turns of each layer of the first pole of the main winding 20a is the same as that of the corresponding layer of the second pole. For example, the number of turns of the coil of the first layer of the first pole is the same as that of the coil of the first layer of the second pole.

[0096] The first layer of coils of the main winding 20a is wound on the farthest slots (slots S1 and S14) among the 14 slots obtained by dividing the 28 slots into equal parts, the second layer of coils of the main winding 20a is wound adjacent to the first layer of coils, the third layer of coils of the main winding 20a is wound adjacent to the second layer of coils, and the fourth and fifth layers of coils of the main winding 20a are also wound in sequence.

[0097] The first layer coil of the first pole of the auxiliary winding 20 b is wound around the stator slots 1 b S7 and S22 by 67 turns.

[0098] The second layer coil of the first pole of the auxiliary winding 20 b is wound around the stator slots 1 b S6 and S23 by 67 turns.

[0099] The third layer coil of the first pole of the auxiliary winding 20 b is wound around the stator slots 1 b S5 and S24 by 42 turns.

[0100] The fourth coil layer of the first pole of the auxiliary winding 20 b is wound 16 turns around the stator slots 1 b S4 and S25 .

[0101] The first layer coil of the second pole of the auxiliary winding 20 b is wound around the stator slots 1 b S8 and S21 by 67 turns.

[0102] The second layer coil of the second pole of the auxiliary winding 20 b is wound around the stator slots 1 b S9 and S20 by 67 turns.

[0103] The third layer coil of the second pole of the auxiliary winding 20 b is wound around the stator slots 1 b S10 and S19 by 42 turns.

[0104] The fourth layer coil of the second pole of the auxiliary winding 20 b is wound 16 turns around the stator slots 1 b S11 and S18 .

[0105] The number of turns of each layer of the first pole of the auxiliary winding 20b corresponds to the same number of turns of the corresponding layer of the second pole. For example, the number of turns of the first layer of the first pole is the same as the number of turns of the first layer of the second pole. The first layer of the auxiliary winding 20b is wound on the following stator slots 1b (S7 and S22), which are stator slots 1b (S7 and S22) stator slots 1b ...

[0106] The second coil layer of the auxiliary winding 20b is wound adjacent to the first coil layer, and the third and fourth coil layers of the auxiliary winding 20b are wound in sequence. The winding diameter of the main winding 20a is 0.75 mm. The winding diameter of the auxiliary winding 20b is 0.725 mm.

[0107] The stator slots 1b around which the main winding 20a and the auxiliary winding 20b are wound simultaneously include slots S4, S5, S10, S11, S18, S19, S24, and S25.

[0108] like Figure 2 As shown, the number of turns of each layer of coils in the x (x=5) layers of coils of the main winding 20a is M1=63, M2=63, M3=63, M4=34, and M5=17. The number of turns of each layer of coils in the y (y=4) layers of coils of the auxiliary winding 20b is A1=67, A2=67, A3=42, and A4=16. The number of stator teeth included between the two stator slots 1b into which each layer of coils in the x layers of coils of the main winding 20a is inserted is Ym1=13, Ym2=11, Ym3=9, Ym4=7, and Ym5=5 from the outermost to the innermost side of the x layers of coils. The number of stator teeth included between two stator slots 1b into which each layer of coils in the y layers of the auxiliary winding 20b is inserted is Ya1=13, Ya2=11, Ya3=9, Ya4=7 from the outermost to the innermost of the y layers of coils.

[0109] Figure 2 In the example, the fundamental wave winding coefficient of the main winding 20a is:

[0110]

[0111] The fundamental wave winding factor of the auxiliary winding 20b is:

[0112]

[0113] Second embodiment

[0114] Compared with the first embodiment, the width of the rotor slot 2b of the second embodiment gradually decreases from the outside to the inside. In other words, the rotor core 2a includes a plurality of rotor slots 2b, and the rotor slots 2b are pear-shaped and closed. In other words, the rotor slots 2b gradually shrink from the bottom of the slot to the slot opening. As a result, the above-mentioned rotor slots 2b prevent the aluminum liquid in liquid form from overflowing from the rotor core 2a when the aluminum rod 2d of the rotor 2 is cast into the rotor core 2a, and the area of ​​the rotor slots 2b can be fully increased, the cross-sectional area of ​​the aluminum rod 2d is increased, and the loss caused by the conduction of the aluminum rod 2d is reduced.

[0115] Third embodiment

[0116] The secondary conductor has an aluminum rod 2d and an end ring electrically connected to each other, and the aluminum rod 2d has a spiral section. Thus, by setting the spiral, the nth harmonic induced voltage at both ends can be reduced, and the asynchronous parasitic torque formed by the harmonics can be reduced.

[0117] Fourth embodiment

[0118] The rotor slots 2b of the rotor core 2a are subjected to a secondary bluing treatment. Compared with the first embodiment, the fourth embodiment performs a secondary bluing treatment on the rotor core 2a. Specifically, the first bluing treatment is performed after the rotor core 2a is stacked and before there is die-cast aluminum liquid, and the second bluing treatment is performed after the rotor core 2a is die-cast. By performing the secondary bluing treatment, the first bluing treatment can form an insulating film on the surface of the rotor slot 2b, which can prevent the torque reduction caused by the short circuit between the core and the secondary conductor and the short circuit between the secondary conductors, and can reduce stray losses and eddy current losses. The second bluing treatment can expel the bubbles between the rotor core 2a and the solid aluminum from the rotor core 2a, thereby increasing the density of the aluminum and reducing the secondary conductor loss of the motor.

[0119] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the structure or unit referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0120] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0121] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stator of a single-phase induction motor for a compressor, characterized in that: include: A stator core, a main winding and an auxiliary winding, wherein the stator core has a plurality of stator slots, the main winding and the auxiliary winding both include multi-layer coils wound in the stator slots to form two poles of the corresponding winding, and the two poles of the main winding are orthogonally distributed with the two poles of the auxiliary winding; The number of stator slots is 28, the number of coil layers / stator slots of each pole of the main winding is km, the number of coil layers / stator slots of each pole of the auxiliary winding is ka, and 1 / 14<ka≤1 / 7<km<3 / 14 is satisfied; the fundamental wave winding coefficient of the main winding is gm, the fundamental wave winding coefficient of the auxiliary winding is ga, and 0.805<gm<0.873<ga<0.969 is satisfied; in, 2. The stator according to claim 1, characterized in that: The number of layers of each pole of the main winding is five, the number of layers of each pole of the auxiliary winding is four, and the following conditions are satisfied: 0.805<gm<0.873<ga<0.

928.

3. The stator according to claim 1, characterized in that: The number of layers of each pole of the main winding is five, the number of layers of each pole of the auxiliary winding is three, and the following conditions are satisfied: 0.805<gm<0.873, 0.928<ga<0.

969.

4. The stator according to any one of claims 1 to 3, characterized in that: The main winding is closer to the slot bottom of the stator slot than the auxiliary winding.

5. The stator according to any one of claims 1 to 3, characterized in that: Each pole of the main winding is composed of x layers of coils, and the first layer of coils to the xth layer of coils are sequentially arranged from the outermost to the innermost side, and the number of stator teeth included between the two stator slots into which the first layer of coils to the xth layer of coils are inserted is Ym1, Ym2, ..., Ymx, respectively, wherein Q / 2>Ym1>Ym2>...>Ymx, and Q is the number of stator slots; Each pole of the auxiliary winding is composed of y layers of coils, and the first layer of coils to the yth layer of coils are distributed in sequence from the outermost to the innermost side, and the number of stator teeth contained between the two stator slots into which the first layer of coils to the yth layer of coils are inserted are Ya1, Ya2, ..., Yay, respectively, where Q / 2>Ya1>Ya2>...>Yay, and Q is the number of stator slots.

6. The stator according to claim 5, characterized in that: Ym1=Ya1=13, in two adjacent layers of coils, the number of stator teeth included between the two stator slots into which the outer coil is inserted minus the number of stator teeth included between the two stator slots into which the inner coil is inserted=2.

7. A single-phase induction motor for a compressor, characterized in that: include: A stator as claimed in any one of claims 1 to 6; as well as The rotor comprises a rotor core and a secondary conductor. The rotor core is rotatably arranged in the stator core. The rotor core comprises a plurality of rotor slots. The secondary conductor is arranged in the rotor slots.

8. The single-phase induction motor for a compressor according to claim 7, characterized in that: The rotor slot is pear-shaped and closed, and its width gradually decreases from the outside to the inside.

9. The single-phase induction motor for a compressor according to claim 8, characterized in that: The secondary conductor has an aluminum rod and an end ring electrically connected to each other, the aluminum rod having a spiral section.

10. The single-phase induction motor for a compressor according to claim 8, characterized in that: The rotor slots of the rotor core are subjected to a secondary bluing treatment, wherein the secondary bluing treatment includes a first bluing treatment before the rotor core is die-cast with aluminum liquid and a second bluing treatment after the rotor core is die-cast.

11. A compressor, characterized in that: The invention comprises the single-phase induction motor for a compressor as claimed in any one of claims 7 to 10.

12. A refrigeration cycle device, characterized in that: Comprising the compressor as claimed in claim 11.

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