Rotary compressor, air conditioner

Abstract

The application provides a rotor compressor and an air conditioner. The compressor comprises a pump body assembly and a motor assembly. The motor stator is provided with three-phase coils, which are a first-phase coil, a second-phase coil and a third-phase coil. In a projection plane formed along the axial projection of the pump body assembly, when the center symmetry line of any eccentric part is rotated to a position symmetrical to the suction pipe about the central axis of the rotating shaft, the series turns of the phase coil through which the pole center line between two adjacent permanent magnets extends are greater than the series turns of the phase coil not through which the pole center line extends. The series turns of the winding corresponding to the phase of the magnetic pole are less than the series turns of the winding corresponding to the phase of the pole position. The winding with large current, i.e. the phase coil through which the pole center line extends, generates greater induced electromotive force, thereby reducing the phase current, balancing the three-phase current and improving the problems of unstable operation and increased loss caused by unbalanced current.

Description

Technical Field

[0001] This invention belongs to the field of compressor design technology, specifically relating to a rotary compressor and an air conditioner. Background Technology

[0002] In a rotary compressor, one rotation of the rotor completes two intake and exhaust cycles (dual rotor) or one intake and exhaust cycle (single rotor) within the cylinder. Each intake and exhaust cycle constitutes half a rotational cycle. At the start of intake, the pump torque begins to increase, reaches its maximum value, and then begins to decrease. Two torque peaks occur within each mechanical cycle (dual rotor, see [link]). Figure 6 (as shown) / Peak primary torque (single rotor, see...) Figure 7 (As shown). Since the number of rotor pole pairs N in a typical rotary compressor motor is ≥ 2, one cycle of pump torque corresponds to N cycles of current waveform. Due to the fluctuation of pump torque, the compressor motor current exhibits large and small fluctuations within one mechanical cycle, and there is also a situation of three-phase current asymmetry, resulting in unstable compressor operation and increased losses. Summary of the Invention

[0003] Therefore, the present invention provides a rotary compressor and an air conditioner that can overcome the technical problems of unstable compressor operation and increased losses caused by the fluctuation of pump body torque in the prior art, the large and small fluctuations of compressor motor current within one mechanical cycle, and the existence of three-phase current asymmetry.

[0004] To address the aforementioned problems, this invention provides a rotary compressor, comprising a pump assembly and a motor assembly. The motor assembly drives the pump assembly to operate, thereby forming periodic intake and compression exhaust of fluid. The motor assembly includes a rotating shaft with an eccentric portion, on which a motor rotor is mounted. The motor rotor has a plurality of permanent magnets spaced apart along its circumference, with adjacent permanent magnets having opposite polarities. A motor stator is fitted over the motor rotor. The pump assembly includes a rotor compression section with an intake pipe. A three-phase coil is wound on the motor stator, comprising a first-phase coil, a second-phase coil, and a third-phase coil. On a projection plane formed by projecting along the axial direction of the pump assembly, when the central symmetry line of the eccentric portion rotates to a position symmetrical to the intake pipe about the central axis of the rotating shaft, the number of series turns of the phase coil through which the inter-pole center line between two adjacent permanent magnets extends is greater than the number of series turns of the phase coils through which the inter-pole center line does not extend.

[0005] In some embodiments, the motor stator has m stator slots and the motor rotor has n magnetic poles, where m / n = 3 / 2.

[0006] In some embodiments, each phase coil has a coil center symmetry line, and when the included angle a between the inter-pole center line and the coil center symmetry line corresponding to the position is less than 360° / 4 / n, the inter-pole center line extends through the phase coil.

[0007] In some embodiments, the series turns of the phase coil through which the inter-pole center line extends are N1, and the series turns of the phase coil through which the other inter-pole center line does not extend are N2, and N1 is an integer between 1.01*N2 and 1.1*N2.

[0008] In some embodiments, the wire diameter of the phase coil with series turns N1 is R1, and the wire diameter of the phase coil with series turns N2 is R2, and R1 / R2= .

[0009] In some embodiments, one of the plurality of three-phase coils arranged uniformly along the circumferential direction of the motor stator has a coil center symmetry line that is collinear with the center line of the suction pipe and is at a position symmetric about the central axis of the rotation shaft of the suction pipe.

[0010] In some embodiments, the motor rotor is provided with a balance block on the end face away from the rotor compression part, and when the eccentric part rotates at a position symmetric about the central axis of the rotation shaft of the suction pipe, the balance block and its fastening screw are symmetric about the center line of the suction pipe on the projection plane, and each of the permanent magnets is symmetric about the center symmetry line of the eccentric part.

[0011] In some embodiments, the rotary compressor further comprises a controller for controlling the operation of the compressor, and the controller is configured to control the current phase of the phase coil to make the current waveform in the phase coil zero-crossing when the phase coil through which the inter-pole center line extends is one phase coil when the eccentric part rotates at a position symmetric about the central axis of the rotation shaft of the suction pipe.

[0012] In some embodiments, the rotary compressor further comprises a controller for controlling the operation of the compressor, and the controller is configured to control the current phase of the two phase coils to make the current waveform in each phase coil maximum when the phase coil through which the inter-pole center line extends is two phase coils when the eccentric part rotates at a position symmetric about the central axis of the rotation shaft of the suction pipe.

[0013] In some embodiments, a voltage regulating device is connected in series between the controller and the three-phase coil, and the voltage regulating device is used to adjust the amplitude and phase of the three-phase voltage output by the controller.

[0014] In some embodiments, the rotor compressor is a double-rotor compressor, the shaft has two eccentric parts, the two eccentric parts are arranged along the axial direction of the shaft and are symmetrically arranged at 180° about the shaft, the rotor compression part has two, and each rotor compression part has a suction pipe, and the two suction pipes are in the same axial direction of the pump body assembly.

[0015] The application also provides an air conditioner comprising the rotor compressor.

[0016] The rotor compressor and the air conditioner provided by the application have the following beneficial effects:

[0017] When the pump body torque is maximum (i.e., when the center symmetric line of any eccentric part rotates to the target position and is collinear with the center line of the suction pipe), the number of turns of the winding (i.e., the coil) of the corresponding phase of the magnetic pole is less than the number of turns of the winding of the corresponding phase of the inter-pole position, so that the phase coil through which the center line of the inter-pole position extends generates a greater induced electromotive force, thereby reducing the current of the phase, balancing the three-phase current, and improving the problems of unstable operation and increased loss caused by unbalanced current.

[0018] Setting N1 to an integer between 1.01*N2 and 1.1*N2 can completely balance the difference between the three-phase currents.

[0019] One of the plurality of three-phase coils arranged uniformly along the circumferential direction of the motor stator has a coil center symmetric line that is collinear with the center line of the suction pipe and is at a position symmetric about the center axis of the shaft of the suction pipe, and the balancing effect of the three-phase current is better; R1 / R2= , so that the three-phase resistances are symmetrical. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. The drawings in the following description are only exemplary, and those skilled in the art can also obtain other implementation drawings according to the provided drawings without paying creative labor.

[0021] Figure 1 is a schematic diagram of the internal structure of the rotor compressor in the embodiments of the application (in the figure, a double-rotor compressor is taken as an example);

[0022] Figure 2 is Figure 1 is a schematic diagram of the axial projection of the rotor compressor in the embodiment of

[0023] Figure 3 isFigure 1 A schematic diagram of the axial projection of a rotary compressor in another embodiment;

[0024] Figure 4 yes Figure 2 An optimized structure for a medium-sized twin-rotor compressor;

[0025] Figure 5 This is a schematic diagram of the compressor according to another embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram showing the relationship between the pump body torque at different angles of motor rotor rotation during one rotation cycle of a twin-rotor compressor and the current values ​​of each phase coil.

[0027] Figure 7 This diagram illustrates the relationship between the pump body torque at different angles of the motor rotor rotation during one rotation cycle of a single-rotor compressor and the current values ​​of each phase coil.

[0028] The attached figures are labeled as follows:

[0029] 1. Pump body assembly; 11. Suction pipe; 2. Motor assembly; 21. Shaft; 211. Eccentric part; 22. Motor rotor; 221. Permanent magnet; 222. Balance block; 23. Motor stator; 231. First phase coil; 232. Second phase coil; 233. Third phase coil; 3. Controller; 4. Voltage regulating device; 100. Compressor housing. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0032] For purposes of the description hereinafter, spatial relations terms, such as "above", "below", "upper", "lower", and the like, can be used with respect to the device or feature under discussion. It will be understood that these spatial relation terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, then a device or feature that is described as "above" or "up" other devices or features would then be oriented "below" or "down" the other devices or features. Thus, the exemplary term "above" can include both the above and below orientations. The devices can also be oriented in other ways (rotated 90 degrees or at other orientations) and the spatially relative terms used herein interpreted accordingly.

[0033] In addition, it should be noted that the use of "first", "second", and the like, terminology, merely to distinguish one component from another, unless the context indicates otherwise. As such, these terms are not intended to limit the scope of the present application, nor are they intended to be used herein to confer rank or importance to the referenced components.

[0034] Specifically referring to Figure 6 As shown, for the double rotor compressor, due to the pump body torsion moment is a periodic change of non-constant load, resulting in a period of current amplitude will also change, when the pump body torsion moment is maximum, the current amplitude is also the largest, for three-phase motor, when the rotor rotates to the pump body torsion moment is maximum, will appear a certain phase or two-phase current amplitude is higher, so that a period of three-phase current imbalance, may appear a large two-phase small, or two-phase large one-phase small, three-phase current asymmetry will also cause the operation is not stable, produce additional loss. Similarly, for single rotor compressor, see Figure 7 As shown.

[0035] For the foregoing phenomenon of the rotor compressor, see Figures 1 to 7As shown, according to the embodiment of the present application, a kind of rotor compressor is provided, comprising pump body assembly 1 and motor assembly 2, pump body assembly 1 and motor assembly 2 are assembled in compressor shell 100, the motor assembly 2 is used to drive the pump body assembly 1 operation to form the periodic suction and compression exhaust of fluid (such as refrigerant), the motor assembly 2 includes the eccentric portion 211 of rotating shaft 21, and for double rotor compressor, the rotating shaft 21 has two eccentric portions 211, two eccentric portions 211 are arranged along the axial direction of rotating shaft 21 and about 180 ° symmetrically arranged about rotating shaft 21, it can be understood that the symmetric arrangement of the above two eccentric portions 211 refers to the symmetry of the two about rotating shaft 21 in its axial projection, motor rotor 22 is provided on rotating shaft 21, motor rotor 22 has a plurality of permanent magnets 221 arranged along the circumferential direction thereof, the polarity of adjacent two permanent magnets 221 is opposite, that is, one is N pole, and the other is S pole, so as to form the alternation of N pole and S pole on the circumference of motor rotor 22, motor stator 23 is sleeved on motor rotor 22, so as to form the stator-rotor air gap (not marked in the figure) between motor stator 23 and motor rotor 22, the pump body assembly 1 includes rotor compression part (not marked in the figure), when it is double rotor compressor, it corresponds to have two rotor compression parts, two eccentric portions 211 are respectively arranged corresponding to each rotor compression part, each rotor compression part has suction pipe 11, and the center axis of two suction pipes 11 is coincident on the projection plane along the axial projection of pump body assembly 1, i.e. the axial direction of rotating shaft 21, three-phase coil is wound on motor stator 23, the three-phase coil is respectively first phase coil 231 (such as phase A in Figure 6 ), second phase coil 232 (such as phase B in Figure 6 ) and third phase coil 233 (such as phase C in Figure 6 ), the first phase coil 231, the second phase coil 232 and the third phase coil 233 are sequentially arranged and form periodic cycle along the rotation direction of motor rotor 22 (as shown by arrow in Figure 2 ), it can be understood that each coil in the same phase can be connected in series and / or parallel, the present application does not particularly limit the specific connection mode of each coil in the same phase, in one specific embodiment of the present application, each coil in each phase is connected in series, on the projection plane formed along the axial projection of pump body assembly 1, when the center symmetry line of any eccentric portion 211 rotates at the position symmetrical about the center axis of suction pipe 11 about rotating shaft 21 (i.e. Figure 2When the center symmetry line of the eccentric part 211 rotates to the target position (i.e., the center line of the air suction pipe 11), the number of turns of the phase coil through which the inter-pole center line of the adjacent two permanent magnets 221 extends is greater than the number of turns of the phase coil not through which the inter-pole center line extends.

[0036] In the technical solution, the number of turns of the winding (i.e., coil) corresponding to the magnetic pole and phase is less than the number of turns of the winding corresponding to the inter-pole position and phase when the torsion moment of the pump body is maximum (i.e., when the center symmetry line of any eccentric part 211 rotates to the target position and is collinear with the center line of the air suction pipe 11), so that the phase with a greater current generates a greater induced electromotive force, thereby reducing the current of the phase, balancing the three-phase current, and improving the problems of unstable operation and increased loss caused by unbalanced current.

[0037] As a specific embodiment, referring to FIG. 2, Figure 2 In the state, the motor rotor 22 has six evenly spaced inter-pole center lines for the 9-slot 6-pole motor assembly, and in the figure, three of the inter-pole center lines extend through the three coils of the first phase coil 231, and the remaining three do not extend through any other phase coil. It should be noted that in this state, the coils of the second phase coil 232 and the third phase coil 233 are respectively arranged at positions opposite to the permanent magnets 221. In this state, the number of turns of the coil of the first phase coil 231 should be greater than the number of turns of the coil of the second phase coil 232 and the third phase coil 233, so as to ensure that the first phase coil 231 can generate a greater induced electromotive force, thereby reducing the current of the first phase coil 231, balancing the three-phase current, and improving the problems of unstable operation and increased loss caused by unbalanced current. Specifically, for the double-rotor compressor in the embodiment, the synthesized torsion moment of the pump body has two peak values corresponding to the rotation of the two eccentric parts 211 to the vicinity of the axial 180° position (i.e., the target position) of the shell air suction port (i.e., the air suction pipe 11). For the motor, the current phase and the rotor magnetic pole phase are 90° electrically apart when the motor output is maximum, that is, when the magnetic pole center line is opposite to the center symmetry line of the coil, the current flowing through the coil reaches the maximum, and the motor output is maximum. Combined with the torsion moment of the pump body, when the rotor shaft 21 rotates to the axial 180° position of the shell air suction port, as shown in FIG. 2, the current phase and the rotor magnetic pole phase are 90° electrically apart, and the motor output is maximum. Figure 2As shown, the A phase (i.e. the three coils in the first phase coil 231) corresponds to the position between the magnetic poles 221, at this time, the A phase current is the largest, and is higher than the B and C phases (i.e. the second phase coil 232 and the third phase coil 233), at this time, the number of turns of the A phase coil is N1, and the number of turns of the B and C phase coils is N2, N1>N2, so that the A phase winding generates a greater induced electromotive force than the B and C phase windings, and the A phase current is reduced, so as to balance the problem of the large A phase current caused by the large pump body torque.

[0038] As another specific embodiment, referring to Figure 3 As shown, in this state, the motor rotor 22 has six evenly spaced inter-pole center lines for the 9-slot 6-pole motor assembly, and it can be seen from the figure that the six inter-pole center lines extend through the three coils of the second phase coil 232 and the third phase coil 233, respectively, but do not extend through the three coils of the first phase coil 231, it should be noted that in this state, the coils of the first phase coil 231 correspond to the positions opposite to the permanent magnets 221, in this state, the number of turns of the coils of the second phase coil 232 and the third phase coil 233 should be greater than the number of turns of the coils of the first phase coil 231, so as to ensure that the second phase coil 232 and the third phase coil 233 can generate a greater induced electromotive force at this time, and the current of the second phase coil 232 and the third phase coil 233 is reduced, so as to balance the three-phase current, and further improve the problem of unstable operation and increased loss caused by unbalanced current. Specifically, in this embodiment, when any eccentric part 211 of the rotor shaft 21 rotates to the axial 180° position of the shell suction port, the B and C phases correspond to the positions between the magnetic poles, and the A phase corresponds to the position of the magnetic pole, then the B and C phase currents are higher than the A phase current, at this time, the number of turns of the B and C phase coils is N1, and the number of turns of the A phase coil is N2, N1>N2, at this time, the B and C phase windings generate a greater induced electromotive force, so as to balance the three-phase current, as shown in Figure 3 .

[0039] It should be noted that, whether it is the state shown in Figure 2 or the state shown in Figure 3 , when the rotor compressor is assembled, the inter-pole center line extends through which phase (or which phases) coil when any eccentric part 211 of the rotor shaft 21 rotates to the aforementioned target position is determined, that is, for an assembled rotor compressor, it does not have both Figure 2 and Figure 3 the two different states shown.

[0040] It is verified by experiments that the foregoing technical solution of the present application is particularly suitable for a rotor compressor with a slot-pole ratio of 3 / 2, that is, the number of stator slots of the motor stator 23 is defined as m, and the number of magnetic poles of the motor rotor 22 is defined as n, and m / n = 3 / 2, for example Figures 2 to 4 The 9-slot 6-pole motor assembly 2 shown in FIG. 1 can also be a 12-slot 8-pole motor assembly 2. It is worth noting that for V-shaped magnetic poles, the number of magnetic poles of the motor rotor 22 is n, and the number of permanent magnets 221 is 2n. Figure 1 For the straight magnetic poles shown in FIG. 2, the number of magnetic poles of the motor rotor 22 is the same as the number of permanent magnets 221, that is, n.

[0041] In order to ensure that when any eccentric part 211 rotates to the foregoing target position, the inter-pole center line does not simultaneously extend through each coil in the three-phase coil, in some embodiments, each phase coil has a coil center symmetry line, and when the included angle a (see FIG. 3) between the inter-pole center line and the coil center symmetry line corresponding to the position of the inter-pole center line is less than 360° / 4 / n, the inter-pole center line extends through the phase coil, for example, when n = 6, a = 15°, and when n = 8, a is also not more than 15°. Figure 3

[0042] In a specific embodiment, the series number of turns of the phase coil through which the inter-pole center line extends is N1, and the series number of turns of the phase coil through which the other inter-pole center line does not extend is N2. It is found through research that for the rotor compressor pump body torsion torque waveform of the conventional technology, the three-phase current values differ by about 10% or less, and setting N1 to an integer between 1.01*N2 and 1.1*N2 can completely balance the three-phase current difference. For a 1.5 Hp compressor, setting N1 near 1.05*N2 is optimal.

[0043] For the two cases shown in FIGS. 4 and 5, compared with the case shown in FIG. 6, only one-phase current is larger, and the current balance can be achieved by increasing the number of turns of the one-phase winding, which is superior to the case shown in FIG. 7. Figure 2 Figure 3 Therefore, when the compressor rotor rotates to the position 180° axially away from the suction port of the shell, the inter-pole position of the permanent magnet is arranged opposite to the center axis of any phase coil of the stator, that is, the inter-pole center line coincides with the center axis of any phase coil of the stator. Specifically, see FIG. 8. Figure 2 Figure 3 Figure 4 ​​​​As shown, one of the plurality of three-phase coils uniformly spaced along the circumferential direction of the motor stator 23 has a coil center symmetry line that is collinear with the center line of the suction pipe 11 and is at a position symmetric about the center axis of the rotation shaft 21 of the suction pipe 11, and the balance effect of the three-phase current is better, that is, when the inter-pole position / magnetic pole position is directly opposite the phase coil center axis, there are two consistent phase currents, and the other phase current is larger or smaller, and in other cases (there is a deviation angle), the three-phase currents are inconsistent, and when the inter-pole position is directly opposite the coil (as shown in the foregoing position), the three-phase current balance can be achieved by only changing one phase current, that is, the inter-pole position is directly opposite the coil (as shown in the foregoing position), and only the number of turns of one phase is increased to achieve the balance, while the magnetic pole position is directly opposite the coil (as shown in the foregoing position), and the number of turns of two phases needs to be increased, resulting in a higher cost. Figure 2 and Figure 4 As shown, one of the plurality of three-phase coils uniformly spaced along the circumferential direction of the motor stator 23 has a coil center symmetry line that is collinear with the center line of the suction pipe 11 and is at a position symmetric about the center axis of the rotation shaft 21 of the suction pipe 11, and the balance effect of the three-phase current is better, that is, when the inter-pole position / magnetic pole position is directly opposite the phase coil center axis, there are two consistent phase currents, and the other phase current is larger or smaller, and in other cases (there is a deviation angle), the three-phase currents are inconsistent, and when the inter-pole position is directly opposite the coil (as shown in the foregoing position), the three-phase current balance can be achieved by only changing one phase current, that is, the inter-pole position is directly opposite the coil (as shown in the foregoing position), and only the number of turns of one phase is increased to achieve the balance, while the magnetic pole position is directly opposite the coil (as shown in the foregoing position), and the number of turns of two phases needs to be increased, resulting in a higher cost. Figure 3 As shown, one of the plurality of three-phase coils uniformly spaced along the circumferential direction of the motor stator 23 has a coil center symmetry line that is collinear with the center line of the suction pipe 11 and is at a position symmetric about the center axis of the rotation shaft 21 of the suction pipe 11, and the balance effect of the three-phase current is better, that is, when the inter-pole position / magnetic pole position is directly opposite the phase coil center axis, there are two consistent phase currents, and the other phase current is larger or smaller, and in other cases (there is a deviation angle), the three-phase currents are inconsistent, and when the inter-pole position is directly opposite the coil (as shown in the foregoing position), the three-phase current balance can be achieved by only changing one phase current, that is, the inter-pole position is directly opposite the coil (as shown in the foregoing position), and only the number of turns of one phase is increased to achieve the balance, while the magnetic pole position is directly opposite the coil (as shown in the foregoing position), and the number of turns of two phases needs to be increased, resulting in a higher cost.

[0044] In another preferred embodiment, the motor rotor 22 is provided with a balance block 222 on the end face away from the rotor compression part, as shown in Figure 2 As shown, one of the plurality of three-phase coils uniformly spaced along the circumferential direction of the motor stator 23 has a coil center symmetry line that is collinear with the center line of the suction pipe 11 and is at a position symmetric about the center axis of the rotation shaft 21 of the suction pipe 11, and the balance effect of the three-phase current is better, that is, when the inter-pole position / magnetic pole position is directly opposite the phase coil center axis, there are two consistent phase currents, and the other phase current is larger or smaller, and in other cases (there is a deviation angle), the three-phase currents are inconsistent, and when the inter-pole position is directly opposite the coil (as shown in the foregoing position), the three-phase current balance can be achieved by only changing one phase current, that is, the inter-pole position is directly opposite the coil (as shown in the foregoing position), and only the number of turns of one phase is increased to achieve the balance, while the magnetic pole position is directly opposite the coil (as shown in the foregoing position), and the number of turns of two phases needs to be increased, resulting in a higher cost. Figure 4 As shown, one of the plurality of three-phase coils uniformly spaced along the circumferential direction of the motor stator 23 has a coil center symmetry line that is collinear with the center line of the suction pipe 11 and is at a position symmetric about the center axis of the rotation shaft 21 of the suction pipe 11, and the balance effect of the three-phase current is better, that is, when the inter-pole position / magnetic pole position is directly opposite the phase coil center axis, there are two consistent phase currents, and the other phase current is larger or smaller, and in other cases (there is a deviation angle), the three-phase currents are inconsistent, and when the inter-pole position is directly opposite the coil (as shown in the foregoing position), the three-phase current balance can be achieved by only changing one phase current, that is, the inter-pole position is directly opposite the coil (as shown in the foregoing position), and only the number of turns of one phase is increased to achieve the balance, while the magnetic pole position is directly opposite the coil (as shown in the foregoing position), and the number of turns of two phases needs to be increased, resulting in a higher cost.

[0045] It should be noted that different numbers of turns of three-phase windings will result in asymmetric three-phase resistance, therefore, the wire diameter of the phase coil with N1 turns in series is R1, the wire diameter of the phase coil with N2 turns in series is R2, R1 / R2= , so as to achieve symmetric three-phase resistance.

[0046] As the phase of the current and the phase of the pump body torque are different, it will affect the current waveform, and further affect the effective value of the current, therefore, as a specific embodiment, the rotor type compressor further comprises a controller 3 for controlling the operation of the compressor, the controller 3 is configured to: when any of the eccentric parts 211 rotates at a position symmetric about the center axis of the rotation shaft 21 of the suction pipe 11, when the inter-pole center line extends through a phase coil, that is Figure 2 As shown, one of the plurality of three-phase coils uniformly spaced along the circumferential direction of the motor stator 23 has a coil center symmetry line that is collinear with the center line of the suction pipe 11 and is at a position symmetric about the center axis of the rotation shaft 21 of the suction pipe 11, and the balance effect of the three-phase current is better, that is, when the inter-pole position / magnetic pole position is directly opposite the phase coil center axis, there are two consistent phase currents, and the other phase current is larger or smaller, and in other cases (there is a deviation angle), the three-phase currents are inconsistent, and when the inter-pole position is directly opposite the coil (as shown in the foregoing position), the three-phase current balance can be achieved by only changing one phase current, that is, the inter-pole position is directly opposite the coil (as shown in the foregoing position), and only the number of turns of one phase is increased to achieve the balance, while the magnetic pole position is directly opposite the coil (as shown in the foregoing position), and the number of turns of two phases needs to be increased, resulting in a higher cost.

[0047] In Figure 3 In the state shown, the controller 3 is configured to control the two-phase current phase to maximize the current waveform in each phase coil when the inter-pole center line extends through two-phase coils, and to maximize the motor output and the pump body torque waveform, further reduce the current, and reduce the loss.

[0048] Because the induced electromotive force generated by the different number of turns of the three-phase winding is different, the three-phase voltage is unbalanced. Therefore, as a preferred embodiment, the controller 3 is connected in series with the voltage regulating device 4 between the three-phase coil, and the voltage regulating device 4 is used to adjust the three-phase voltage amplitude and phase output by the controller 3, so that the controller 3 outputs three-phase voltage with the same amplitude and phase. The voltage regulating device 4 can be provided on the control board in the controller 3.

[0049] According to the embodiment of the present application, an air conditioner is also provided, which comprises the above-mentioned rotor-type compressor. Because the aforementioned double-rotor compressor is used, by setting the winding (i.e., the coil) of the corresponding phase of the magnetic pole in series with the number of turns less than the winding of the corresponding phase of the inter-pole position when the center symmetry line of any eccentric part 211 rotates to the aforementioned target position and is collinear with the center line of the suction pipe 11, the phase with greater current, i.e., the phase coil through which the inter-pole center line extends, generates greater induced electromotive force, thereby reducing the phase current, balancing the three-phase current, and improving the problems of unstable operation and increased loss caused by unbalanced current.

[0050] It is easy for those skilled in the art to understand that the advantageous technical features of each of the above-mentioned modes can be freely combined and superimposed without conflict.

[0051] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rotary compressor comprising a pump body assembly (1) and a motor assembly (2) for driving the pump body assembly (1) to operate to form periodic suction and compression discharge of fluid, the motor assembly (2) comprising a rotating shaft (21) having an eccentric portion (211), the rotating shaft (21) being provided with a motor rotor (22), the motor rotor (22) being provided with a plurality of permanent magnets (221) arranged at intervals along a circumferential direction thereof, adjacent two of the permanent magnets (221) having opposite polarities, the motor rotor (22) being provided with a motor stator (23) outside the motor rotor (22), characterized in that, The pump body assembly (1) comprises a rotor compression part having a suction pipe (11), a motor stator (23) is provided with three-phase coils, the three-phase coils are respectively a first-phase coil (231), a second-phase coil (232) and a third-phase coil (233), on a projection plane formed by an axial projection of the pump body assembly (1), when a center symmetry line of the eccentric part (211) is rotated to a position symmetrical to the suction pipe (11) about a center axis of the rotating shaft (21), the number of series turns of the phase coil through which a pole interval center line between two adjacent permanent magnets (221) extends is greater than the number of series turns of the phase coil not through which other pole interval center lines extend.

2. The rotary compressor of claim 1, wherein The motor stator (23) has a number of stator slots m, and the motor rotor (22) has a number of magnetic poles n, m / n=3 / 2.

3. The rotary compressor of claim 2, wherein Each phase coil has a coil center symmetry line, when an included angle a between the pole interval center line and the coil center symmetry line corresponding to the position is less than 360° / 4 / n, the pole interval center line extends through the phase coil.

4. The rotary compressor of claim 1, wherein The number of series turns of the phase coil through which the pole interval center line extends is N1, and the number of series turns of the phase coil not through which other pole interval center lines extend is N2, N1 is an integer between 1.01*N2 and 1.1*N2.

5. The compressor as set forth in claim 1, wherein R1 / R2 = N2 / N1 .

6. The rotary compressor of claim 1, wherein One of the plurality of three-phase coils uniformly spaced along the circumferential direction of the motor stator (23) has a coil center symmetry line that is collinear with the center line of the suction pipe (11) and is located at a position symmetrical to the suction pipe (11) about the center axis of the rotating shaft (21).

7. The rotary compressor according to claim 6, wherein The motor rotor (22) is provided with a balance block (222) on the end face away from the rotor compression part, when the eccentric part (211) is rotated to a position symmetrical to the suction pipe (11) about the center axis of the rotating shaft (21), on the projection plane, the balance block (222) and its fastening screw are symmetrical about the center line of the suction pipe (11), and each permanent magnet (221) is symmetrical about the center symmetry line of the eccentric part (211).

8. The rotary compressor of claim 1, wherein Further comprising a controller (3) for controlling the operation of the compressor, the controller (3) is configured to: when the eccentric part (211) is rotated to a position symmetrical to the suction pipe (11) about the center axis of the rotating shaft (21), when the phase coil through which the pole interval center line extends is a kind of phase coil, control the current phase of the phase coil to make the current waveform in the phase coil zero-crossing.

9. The rotary compressor of claim 1, wherein Further comprising a controller (3) for controlling the operation of the compressor, the controller (3) is configured to: when the eccentric part (211) is rotated to a position symmetrical to the suction pipe (11) about the center axis of the rotating shaft (21), when the phase coil through which the pole interval center line extends is two kinds of phase coils, control the current phase of the two kinds of phase coils to make the current waveform in each phase coil maximum.

10. The rotary compressor according to claim 8 or 9, characterized in that, The controller (3) is connected in series with the three-phase coil with a voltage regulating device (4) for regulating the three-phase voltage amplitude and phase output by the controller (3).

11. The rotary compressor of claim 1, wherein The rotor compressor is a double-rotor compressor, the shaft (21) has two eccentric parts (211), the two eccentric parts (211) are arranged in an axial direction of the shaft (21) and are symmetrically arranged about the shaft (21) by 180°, and the rotor compression part has two, each of the rotor compression parts has a suction pipe (11), and the two suction pipes (11) are in the same axial direction of the pump body assembly (1).

12. An air conditioner characterized by comprising: The rotor compressor of any one of claims 1 to 11 is included.

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