Motor, compressor and air conditioner

Abstract

The application discloses a motor, a compressor and an air conditioner. The motor according to the application has P stages, and a stator core and a rotor core are arranged in the motor. Magnets are arranged on the rotor core. The thickness of the magnets along a magnetization direction is L. A plurality of magnetic poles are formed on the rotor core. N magnets are arranged in each magnetic pole. The total width of the magnets along a direction perpendicular to the magnetization direction under the same magnetic pole is w, and the following condition is satisfied: w = w1 + w2 + … + w n , where Br is the residual magnetism of the magnets. The stator core is arranged at the outer periphery of the rotor core. The outer diameter of the stator core is R1, and the inner diameter of the stator core is R2. A plurality of stator slots are arranged on the stator core. The number of the stator slots is Q. The stator slots are used for accommodating windings. The series turns of each phase winding are N. The resistivity of the windings is A, and the following condition is satisfied: A >= 0.02 Omega mm 2 / m. The connection correction coefficient of the windings is a, and the following condition is satisfied: 0.35 <= NAGCD (Q, P) R2 / (aR1BrLw) <= 0.65. The motor according to the application balances electromagnetic load and improves motor efficiency.

Description

Technical Field

[0001] This invention relates to the field of household appliances, and in particular to a motor, compressor and air conditioner. Background Technology

[0002] Due to the continuous rise in copper wire prices, the use of aluminum wire to replace copper wire has become an industry trend in order to reduce the cost of air conditioner compressor motors. However, aluminum wire motors have high winding losses. In order to improve motor energy efficiency, it is necessary to optimize the design of the motor rotor and stator and balance the electromagnetic load. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of this invention is to provide an electric motor. The electric motor according to the invention, by defining N... A GCD(Q,P) R2 / (a R1 Br L The range of values ​​for w) can balance the electromagnetic load of the motor and improve its energy efficiency while ensuring that aluminum wire is used in the winding to reduce costs, thus taking into account both the cost control and performance requirements of the motor.

[0004] The present invention also proposes a compressor including the above-mentioned motor.

[0005] The present invention also proposes an air conditioner including the above-mentioned compressor.

[0006] According to one embodiment of the present invention, the motor has P poles, and the motor is provided with a stator core and a rotor core. A magnet is disposed on the rotor core, and the thickness of the magnet along the magnetization direction is L. Multiple magnetic poles are formed on the rotor core, and each magnetic pole contains n magnets. The total width of the magnets under the same magnetic pole along the direction perpendicular to the magnetization direction is w, and satisfies: w = w1 + w2 + ... + w n The remanence of the magnet is Br; the stator core is disposed on the outer periphery of the rotor core, the outer diameter of the stator core is R1, the inner diameter of the stator core is R2, and the stator core has multiple stator slots, the number of which is Q. The stator slots are used to accommodate windings, the number of series turns of the windings in each phase is N, and the resistivity of the windings is A, satisfying: A≥0.02Ω. mm 2 / m, the winding connection correction factor is a, and satisfies: 0.35≤N A GCD(Q,P) R2 / (a R1 Br L w)≤0.65; wherein, if the winding is connected in series at an angle, then a=1.732; if the winding is connected in series at a star, then a=1.

[0007] The motor according to the present invention transmits electrical load N to the motor. A / a, magnetic load Br L The comprehensive constraints of w, split ratio R2 / R1, winding resistivity A, winding connection correction factor a, the greatest common divisor GCD(Q,P) of the number of stator slots Q and the number of stages P, and the number of series turns N of each phase winding can balance electrical and magnetic loads, reduce winding and core losses, and take into account the output torque and energy efficiency requirements of the motor while ensuring that aluminum wire is used to reduce costs. This solves the problem of high winding losses and substandard energy efficiency after aluminum wire replaces copper wire, so that motors using aluminum wire windings can still meet the energy efficiency standards of air conditioner compressors, achieving a balance between cost reduction and efficiency improvement.

[0008] According to one embodiment of the present invention, the opening width of the stator slot is d, a tooth is formed between two adjacent stator slots, the width of the tooth is b, and a yoke is provided between the radially outer ends of two adjacent teeth, the radial thickness of the yoke is c, and satisfies: 8 ≤ Br L w / (b) c d GCD(Q,P))≤10.

[0009] According to one embodiment of the present invention, the outer diameter of the rotor core is R3, and satisfies: 0.4≤R2-R3≤1.7.

[0010] According to one embodiment of the present invention, the motor split ratio is R2 / R1, and satisfies: 0.5≤R2 / R1≤0.6.

[0011] According to one embodiment of the present invention, the rotor core includes: rotor laminations, wherein a plurality of rotor laminations are configured to be stacked in the axial direction of the rotor core, each rotor lamination having a magnetic slot suitable for accommodating the magnet, and the magnetic slots of the plurality of rotor laminations facing each other.

[0012] According to one embodiment of the present invention, a first magnetic steel slot and a second magnetic steel slot are provided symmetrically arranged in the same magnetic pole on the rotor lamination, the radial inner ends of the first magnetic steel slot and the second magnetic steel slot are spaced apart from each other, and the radial outer ends of the first magnetic steel slot and the second magnetic steel slot extend in a direction away from each other.

[0013] According to one embodiment of the present invention, the rotor lamination is further provided with a third magnet slot, which is disposed between the radial inner end of the first magnet slot and the radial inner end of the second magnet slot.

[0014] According to one embodiment of the present invention, each of the rotor laminations is provided with rivet holes and flow holes facing each other in the axial direction, and a plurality of the rotor laminations are riveted together to form the rotor core.

[0015] The compressor according to the present invention is briefly described below.

[0016] The compressor according to the present invention includes the motor in the above embodiments. Since the compressor according to the present invention is equipped with the motor in the above embodiments, the compressor can reduce production costs with aluminum wire windings while ensuring its energy efficiency meets the standards, thus balancing production costs and performance requirements. This better meets the long-term operation and use needs of air conditioners and improves the market competitiveness of the compressor.

[0017] The air conditioner according to the present invention is briefly described below.

[0018] The air conditioner according to the present invention includes the compressor in the above embodiments. Since the air conditioner of the present invention is equipped with the above-mentioned compressor, the air conditioner can control the overall production cost while ensuring its own operating energy efficiency and meeting the requirements of national energy efficiency standards. At the same time, it can reduce the electricity expenses of users in the long term, improve the market competitiveness of the product, and take into account both cost control on the production side and user experience on the user side.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the layout of the stator core and rotor core of an electric motor according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a motor according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a rotor core according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a rotor core according to another embodiment of the present invention; Figure 5 This is a schematic diagram of a compressor structure according to an embodiment of the present invention; Figure 6 N is according to an embodiment of the present invention A GCD(Q,P) R2 / (a R1 Br L A graph showing the relationship between w) and motor (compressor) energy efficiency; Figure 7 Br is according to an embodiment of the present invention L w / (b) c d Relationship between GCD(Q,P) and motor (compressor) energy efficiency.

[0021] Figure label: Motor 1; Rotor core 11, magnet 111, rivet hole 112, flow hole 113, first magnet slot 114, second magnet slot 115, third magnet slot 116; Stator core 12, stator slot 121, tooth 122, winding 123, yoke 124; 2. Compressor, 21. Main housing, 22. Receiving cavity, 23. Pump body, 24. Connecting hole, 25. Connecting pipe, 26. Liquid receiver. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] Due to the continuous rise in copper wire prices, the use of aluminum wire to replace copper wire has become an industry trend in order to reduce the cost of air conditioner compressor motors. However, aluminum wire motors have high winding losses. In order to improve motor energy efficiency, it is necessary to optimize the design of the motor rotor and stator and balance the electromagnetic load.

[0024] The following is for reference. Figures 1-7 A motor according to an embodiment of the present invention is described.

[0025] According to the present invention, the motor 1 has P poles. The motor 1 includes a stator core 12 and a rotor core 11. Magnets 111 are disposed on the rotor core 11. The stator core 12 is arranged around the outer periphery of the rotor core 11. The rotor core 11 has multiple magnetic poles, and each magnetic pole has n magnets 111. The thickness of each magnet 111 in the magnetization direction is L, and the width of the magnet 111 perpendicular to the magnetization direction is w. xHere, x only represents the corresponding index of magnet 111. For example, the first magnet 111 corresponds to w1, and the nth magnet 111 corresponds to w. n Therefore, under the same magnetic pole, the total width w of n magnets 111 perpendicular to the magnetization direction is the sum of the corresponding widths of the n magnets 111, that is, w = w1 + w2 + ... + w n The magnet 111 has a remanence of Br. The stator core 12 has multiple stator slots 121 arranged circumferentially at intervals. These slots accommodate windings 123. The number of stator slots 121 is Q. The number of turns in series in each phase winding 123 is N. The resistivity of the winding 123 is A. The solution correction coefficient for the winding 123 is a. The outer diameter of the stator core 12 is R1, and the inner diameter is R2. When designing the motor 1, the range of values ​​for parameters such as P, L, Q, N, A, a, w, Br, R1, and R2, as well as their relationships, can be limited to optimize the structure of the motor 1, balance its electromagnetic load, and thus improve its energy efficiency. For example, when designing the stator and rotor of the motor 11, limitations can be imposed in the following aspects: S1: Defines the electrical load of motor 1. The electrical load of motor 1 can be expressed as N. A / a indicates that during the operation of motor 1, the electrical load of motor 1 directly affects the magnitude of winding 123 loss. The greater the electrical load, the higher the winding 123 loss under the same output power, the more severe the heating of motor 1, and the lower the energy efficiency. S2: Defines the magnetic load of motor 1. The magnetic load of motor 1 can be expressed as Br. L w indicates that Br L w reflects the total magnetic flux per pole of the rotor. During the operation of motor 1, the magnetic load of motor 1 directly affects the magnitude of the air gap magnetic flux density. Under the same stator size, the larger the magnetic load, the higher the air gap magnetic flux density, and the greater the output torque of motor 1, but it will increase the core loss and reduce the energy efficiency of motor 1. S3: Limit the split ratio of motor 1. The split ratio of motor 1 can be represented by R2 / R1. The split ratio of motor 1 reflects the ratio between the inner and outer diameters of the stator core 12. When the outer diameter R1 of the stator core 12 is fixed, the larger the split ratio R2 / R1, the more magnets 111 are used in the rotor, the greater the magnetic load, the greater the loss of the rotor core 11, and the smaller the current. However, the area of ​​the winding 123 that can be accommodated is reduced, and the resistance of the winding 123 is increased. Therefore, the split ratio needs to be set reasonably to balance the magnetic load and the resistance of the winding 123, thereby balancing the loss of the winding 123 and the loss of the rotor core 11, and improving the energy efficiency of motor 1. S4: Limit the resistivity A of winding 123. The larger the value of A, the lower the cost of winding 123. However, correspondingly, excessively high resistivity of winding 123 will lead to increased losses in winding 123 and reduced efficiency of motor 1. In actual design, the minimum value of A can be limited to 0.02Ω. mm² / m can meet the cost reduction requirement of aluminum wire winding 123, and also avoid excessive losses of winding 123 affecting the efficiency of motor 1. S5: Limits the correction coefficient 'a' for the connection of windings 123. Different connection methods correspond to different coefficient values. For example, if the series connection of windings 123 is delta, then the value of 'a' is 1.732; if the series connection of windings 123 is star, then the value of 'a' is 1. S6: Limit the thickness L of magnet 111 along the magnetization direction. The larger the value of L, the more fully the residual magnetism Br can be utilized and the higher the air gap magnetic flux density. However, it will occupy more space in the rotor core 11, resulting in a decrease in the mechanical strength of the rotor and an increase in the material cost of motor 1. S7: The relationship between the number of stator slots 121 Q and the number of stages P is limited. Stator slots 121 are structures that accommodate windings 123. The larger the value of Q, the more difficult it is to control the full fill rate of motor 1 slots. At the same time, the larger the greatest common divisor of Q and P, GCD(Q, P), the lower the harmonic loss of windings 123 of motor 1, and the higher the efficiency of motor 1. S8: Limits the number of series turns N of each phase winding 123. The larger the value of N, the longer the connection at the end of winding 123, the greater the resistance of winding 123, and the higher the copper or aluminum loss. At the same time, the value of N will also affect the size of the electrical load. Reasonably controlling the value of N can balance the electrical load and the losses of winding 123 and avoid reducing energy efficiency. Since the above solutions are interrelated and require comprehensive consideration, in the actual design of motor 1, the above solutions can be combined. After analysis, the electrical load N of motor 1 can be determined. A / a, magnetic load Br L The following parameters are considered in the optimal design: w, split ratio R2 / R1, resistivity A of winding 123, correction factor a for winding 123 connection, greatest common divisor GCD(Q,P) of the number of stator slots 121 Q and the number of stages P, and the number of series turns N of each phase winding 123, to satisfy: 0.35≤N A GCD(Q,P) R2 / (a R1 Br L w)≤0.65, such as 6 Figure 6 As shown, Figure 6 The energy efficiency and N of motor 1 (compressor 2) A GCD(Q,P) R2 / (a R1 Br L The relationship diagram of the values ​​of w, where N A GCD(Q,P) R2 / (a R1 Br L The x-axis represents the energy efficiency of motor 1 (compressor 2), and the y-axis represents the energy efficiency of motor 1 (compressor 2). Figure 6 It can be seen that N A GCD(Q,P) R 2 / (a) R1 Br L The value of w) has a non-linear relationship with the energy efficiency of motor 1. When N A GCD(Q,P) R2 / (a R1 Br L When the value of w is between 0.35 and 0.65, motor 1 has high energy efficiency. It can reduce the material cost of motor 1, balance the electrical load and magnetic load, reduce the winding loss 123 and the iron core loss, thereby effectively improving the energy efficiency of motor 1 and meeting the energy efficiency requirements after aluminum wire replaces copper wire to reduce costs.

[0026] Specifically, motor 1 transmits electrical load N to motor 1. A / a, magnetic load Br L The comprehensive constraints of w, split ratio R2 / R1, resistivity A of winding 123, correction coefficient a for winding 123 connection, the greatest common divisor GCD(Q,P) of the number of stator slots 121 Q and the number of stages P, and the number of series turns N of each phase winding 123 can balance the electrical and magnetic loads, reduce winding 123 losses and core losses, and take into account the output torque and energy efficiency requirements of motor 1, while ensuring that aluminum wire is used to reduce costs in winding 123. This solves the problem of high losses and substandard energy efficiency in winding 123 after aluminum wire is used to replace copper wire, so that motor 1 using aluminum wire winding 123 can still meet the energy efficiency standards of air conditioner compressor 2, achieving a balance between cost reduction and efficiency improvement.

[0027] According to one embodiment of the present invention, the opening width of the stator slot 121 is d, a tooth 122 is formed between two adjacent stator slots 121, the width of the tooth 122 is b, and a yoke 124 is provided between the radially outer ends of two adjacent tooth 122, the radial thickness of the yoke 124 is c, and satisfies: 8≤Br L w / (b) c d GCD(Q,P))≤10.

[0028] Stator slot 121 is a structure that accommodates winding 123. The design of stator slot 121 affects the arrangement of winding 123. Therefore, the dimensions of stator slot 121 need to be limited. The larger the opening width d of stator slot 121, the more convenient it is for winding 123 to be laid down, reducing the processing difficulty of stator slot 121. However, an excessively large opening width will increase the cogging torque, resulting in increased operating noise of motor 1. A tooth 122 is formed between two adjacent stator slots 121. The width of the tooth 122 is b. The larger the value of b, the more... The larger the value of b, the lower the saturation of the tooth section 122 and the smaller the core loss. However, if b is too large, it will squeeze the space of the stator slot 121, reduce the area that the winding 123 can accommodate, and is not conducive to reducing the electrical load. A yoke 124 is provided between two adjacent tooth sections 122. The yoke 124 is connected to the radial outer end of the two adjacent tooth sections 122. The thickness of the yoke 124 in the radial direction is c. The larger the value of c, the lower the saturation of the yoke 124 and the smaller the core loss. However, it will squeeze the space of the stator slot 121 and affect the arrangement of the winding 123.

[0029] Therefore, it is necessary to comprehensively consider the relationship between parameters b, c, and d, and combine this with the thickness L in the magnetization direction of magnet 111111, the remanence Br of magnet 111, the total width w of magnet 111 under the same magnetic pole, and the greatest common divisor GCD(Q, P) of the number Q and the number of stator slots 121, in order to further optimize the structure of the stator and rotor. Specifically, through analysis and calculation, Br can be obtained. L w / (b) c d The relationship between GCD(Q,P) and the energy efficiency of motor 1 (compressor 2) is as follows: Figure 7 As shown, Br L w / (b) c d The value of GCD(Q, P) also exhibits a non-linear relationship with the energy efficiency of motor 1 (compressor 2), due to... Figure 7 It can be seen that when Br L w / (b) c d When the value of GCD(Q, P) is between 8 and 10, motor 1 has the highest energy efficiency, ranging from 621% to 622%. Therefore, in the actual design of motor 1, Br can be used as the energy efficiency. L w / (b) c d The value of GCD(Q, P) is limited to between 8 and 10. This ensures that the tooth section 122 and the yoke section 124 have sufficient magnetic flux to pass through, and that the core loss will not be increased due to excessive magnetic density. It also allows for sufficient space in the stator slot 121 to accommodate the winding 123, reducing the electrical load and winding 123 loss. At the same time, it can control the cogging torque, avoid excessive noise during the operation of the motor 1, and further improve the overall performance of the motor 1. This ensures that the energy efficiency of the motor 1 meets the standards while reducing costs.

[0030] According to one embodiment of the present invention, the outer diameter of the rotor core 11 is R3, and satisfies: 0.4 ≤ R2 - R3 ≤ 1.7. For example... Figure 1 As shown, the outer diameter of the rotor core 11 is R3, and the inner diameter of the stator core 12 is R2. The difference between the inner diameter of the stator core 12 and the outer diameter of the rotor core 11, R2-R3, represents the air gap length of the motor 1. The air gap length is an important parameter affecting the performance of the motor 1. The larger the air gap length, the greater the air gap magnetic reluctance of the motor 1, requiring greater excitation. When the rotor magnetic field strength is fixed, the air gap magnetic flux density decreases, which leads to a decrease in the output torque of the motor 1. At the same time, an excessively large air gap length will also reduce the power factor of the motor 1. Moreover, under the same output torque, a decrease in air gap magnetic flux density will also lead to an increase in current, thereby increasing the losses of windings 123. If the air gap length is too small, friction is easily generated between the rotor and the stator, affecting the operating stability of the motor 1. It will also increase the tooth harmonic losses of the motor 1, increasing additional losses and reducing the energy efficiency of the motor 1. Therefore, in actual design, the air gap length R2-R3 can be limited to the range of 0.4mm~1.7mm. This can avoid the risk of increased harmonic loss and rotor friction caused by an excessively small air gap, and also avoid the risk of insufficient air gap magnetic flux density, reduced output torque and motor 1 energy efficiency caused by an excessively large air gap. This further optimizes the performance of motor 1 and ensures that the aluminum wire winding 123 motor 1 can still meet the requirements of energy efficiency and operational reliability after cost reduction.

[0031] According to one embodiment of the present invention, the split ratio of motor 1 is R2 / R1, and satisfies: 0.5≤R2 / R1≤0.6. The split ratio of motor 1 is the ratio of the inner diameter R2 to the outer diameter R1 of the stator core 12, reflecting the proportional relationship between the usable space inside the stator core 12 and its overall size. When the outer diameter R1 of the stator core 12 is fixed, a larger split ratio in the motor 1 means a shallower stator slot 121, a smaller slot area, a smaller winding wire diameter that can be accommodated, and a higher resistance and higher loss of the winding 123 under the same current density. On the other hand, if the split ratio is too small, the stator slot 121 will be deeper, which will lead to insufficient available space in the rotor core 11, limited use of magnets 111, and the magnetic load will not meet the output torque requirements. Therefore, the split ratio is limited to between 0.5 and 0.6, which can reserve enough stator slots 121 to accommodate the winding 123, control the resistance and loss of the winding 123, and ensure that the rotor 11 has enough space to arrange magnets 111 to meet the magnetic load and output torque requirements, further balancing the electromagnetic load and improving the motor efficiency.

[0032] According to one embodiment of the present invention, the rotor core 11 includes rotor laminations, which are configured as multiple laminations stacked axially on the rotor core 11. Each rotor lamination has a magnetic slot suitable for accommodating a magnet 111, and the magnetic slots of the multiple rotor laminations face each other. After the multiple rotor laminations are stacked, the facing magnetic slots together form an installation channel for installing the magnet 111, which can reduce the processing difficulty of the rotor laminations, facilitate the insertion of the magnet 111 into the magnetic slot, and at the same time ensure the overall structural stability of the rotor core 11 and improve the dynamic balance performance of the motor rotor 1.

[0033] According to one embodiment of the present invention, a first magnetic slot 114 and a second magnetic slot 115 are symmetrically arranged within the same magnetic pole on the rotor lamination. The radially inner ends of the first magnetic slot 114 and the second magnetic slot 115 are spaced apart from each other, and the radially outer ends of the first magnetic slot 114 and the second magnetic slot 115 extend in a direction away from each other. Figures 1-2 As shown, each magnetic pole of the rotor lamination is provided with a first magnetic steel slot 114 and a second magnetic steel slot 115. The first magnetic steel slot 114 and the second magnetic steel slot 115 are respectively used to arrange the corresponding magnets 111. When designing the rotor, the first magnetic steel slot 114 and the second magnetic steel slot 115 in the same magnetic pole can be arranged symmetrically. The radial inner ends of the first magnetic steel slot 114 and the second magnetic steel slot 115 are spaced apart from each other, and the radial outer ends extend inclined in the direction away from each other, presenting a "V" shaped layout. This can increase the spacing between the two magnets 111 under the same magnetic pole, adjust the distribution of the air gap magnetic field, weaken the harmonic magnetic flux, and reduce the additional losses caused by harmonics.

[0034] According to one embodiment of the present invention, such as Figure 3As shown, a third magnet slot 116 is also provided on the rotor lamination. The third magnet slot 116 is located between the radial inner end of the first magnet slot 114 and the radial inner end of the second magnet slot 115. Unlike the aforementioned "V"-shaped magnet slot design, the rotor laminations can also be equipped with a third magnet slot 116. Specifically, the third magnet slot 116 is located in the interval area between the radial inner ends of the first magnet slot 114 and the second magnet slot 115. It allows for the addition of an extra magnet 111 within the same magnetic pole, resulting in a "U"-shaped arrangement of the magnet slots within the same magnetic pole. The added third magnet slot 116 can accommodate an extra magnet 111, which can increase the total magnetic flux under the same magnetic pole, increase the rotor magnetic load, and improve the output torque of the motor 1. At the same time, it can further adjust the distribution of the air gap magnetic field, reduce harmonic content, reduce harmonic losses, and further improve the energy efficiency of the motor 1. Moreover, it does not excessively occupy the radial space of the rotor core 11, thus better ensuring the mechanical strength of the rotor core 11 and balancing the torque output performance, energy efficiency, and operational reliability of the motor 1.

[0035] In some embodiments, such as Figure 4 As shown, only one magnet slot can be set in the same magnetic pole of each rotor lamination, that is, the magnet slots in the same magnetic pole are arranged in a "I" shape. The structure is simple, and the processing and assembly are more convenient. It can reduce the production and processing cost of the rotor. When the design power of motor 1 is small and the requirement for magnetic flux is not high, the torque output requirement can be met by using the "I" shaped arrangement of magnet slots. It can also simplify the production process and further control the overall production cost of motor 1.

[0036] According to one embodiment of the present invention, each rotor lamination is provided with rivet holes 112 and flow holes 113 facing each other in the axial direction. Multiple rotor laminations are riveted together to form a rotor core 11. During assembly, after the rivets pass through the rivet holes 112 of multiple rotor laminations, the multiple rotor laminations are pressed and fixed into a whole to form a rotor core 11. The connection structure is simple, easy to process and assemble, and has high connection reliability, which can ensure the overall structural strength of the rotor core 11 and meet the structural stability requirements of the motor 1 for long-term high-speed operation. The flow holes 113 can allow cooling airflow to pass through during the operation of the motor 1, carrying away the heat generated by the rotor core 11, magnets 111 and windings 123, reducing the overall operating temperature of the motor 1. This can improve the heat dissipation efficiency of the motor 1, prevent the windings 123 from overheating and increasing resistivity, prevent the windings 123 from increasing losses, delay the aging of insulation materials and magnets 111, extend the service life of the motor 1, improve the long-term reliability of the motor 1, and reduce the overall weight of the rotor core 11, reduce the amount of raw materials used, and further reduce the production cost of the motor 1.

[0037] The compressor 2 according to the present invention is briefly described below.

[0038] The compressor 2 according to the present invention includes the motor 1 in the above embodiments. Since the compressor 2 according to the present invention is equipped with the motor 1 in the above embodiments, the compressor 2 can ensure that its energy efficiency level meets the standards while reducing the production cost of the aluminum wire winding 123. It takes into account both production cost and performance requirements, and can better meet the long-term operation and use needs of air conditioners, thereby improving the market competitiveness of the compressor 2.

[0039] In some embodiments, the compressor 2 is provided with a main housing 21, and a receiving cavity 22 is formed inside the main housing 21. The motor 1 is arranged in the receiving cavity 22, and a pump body 23 is provided at the bottom of the motor 1. Meanwhile, a connecting hole 24 is opened on the peripheral side wall of the housing, and a connecting pipe 25 is provided on the pump body 23. The connecting pipe 25 passes through the connecting hole 24 and connects to a liquid receiver 26 outside the main housing 21. The liquid receiver 26 is used to store refrigerant. The refrigerant enters the pump body 23 through the connecting pipe 25, is compressed by the pump body 23, and is sent into the heat exchange cycle for heat exchange. During the operation of the pump body 23 driven by the motor 1, since the motor 1 itself takes into account both cost and energy efficiency, the compressor 2 can operate stably for a long time. At the same time, it can reduce the overall operating energy consumption of the compressor 2, so that the compressor 2 can still achieve a high energy efficiency level and meet higher energy efficiency standards while controlling the production and manufacturing costs.

[0040] The air conditioner according to the present invention is briefly described below.

[0041] The air conditioner according to the present invention includes the compressor 2 in the above embodiments. Since the air conditioner of the present invention is equipped with the compressor 2, the air conditioner can control the overall production cost while ensuring its own operating energy efficiency and meeting the requirements of national energy efficiency standards. At the same time, it can reduce the electricity expenses of users in the long term, improve the market competitiveness of the product, and take into account both cost control on the production side and user experience on the user side.

[0042] In some embodiments, compressor 2 may be a variable frequency compressor, and compressor 2 may also be used in other electrical equipment.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limitations on this invention.

[0044] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0045] In the description of this invention, "a plurality of" means two or more.

[0046] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0047] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric motor, characterized in that, The motor has P poles and includes a stator core (12) and a rotor core (11). Magnets (111) are mounted on the rotor core (11), with a thickness L along the magnetization direction. Multiple magnetic poles are formed on the rotor core (11), and each pole contains n magnets (111). The total width of the magnets (111) along the perpendicular direction to the magnetization direction under the same magnetic pole is w, satisfying: w = w1 + w2 + ... + w n The magnet (111) has a remanence of Br; the stator core is disposed on the outer periphery of the rotor core (11), the outer diameter of the stator core (12) is R1, the inner diameter of the stator core (12) is R2, the stator core (12) has multiple stator slots (121), the number of stator slots (121) is Q, the stator slots (121) are used to accommodate windings (123), the number of series turns of each phase of the windings (123) is N, the resistivity of the windings (123) is A, and satisfies: A≥0.02Ω. mm 2 / m, the connection correction factor of the winding (123) is a, and satisfies: 0.35≤N A GCD(Q,P) R2 / (a R1 Br L w) ≤ 0.65; where If the winding (123) is connected in series at a delta, then a = 1.732; if the winding (123) is connected in series at a star, then a = 1.

2. The motor according to claim 1, characterized in that, The stator slot (121) has an opening width of d. A tooth (122) is formed between two adjacent stator slots (121). The width of the tooth (122) is b. A yoke (124) is provided between the radial outer ends of two adjacent teeth (122). The thickness of the yoke (124) in the radial direction is c, and it satisfies: 8 ≤ Br L w / (b) c d GCD(Q,P))≤10.

3. The motor according to claim 1, characterized in that, The outer diameter of the rotor core (11) is R3, and satisfies: 0.4≤R2-R3≤1.

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4. The motor according to claim 1, characterized in that, The motor split ratio is R2 / R1, and satisfies: 0.5≤R2 / R1≤0.

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5. The motor according to claim 1, characterized in that, The rotor core (11) includes: The rotor laminations are constructed as a plurality of laminations stacked axially on the rotor core (11), each of the rotor laminations having a magnetic slot suitable for accommodating the magnet (111), and the magnetic slots of the plurality of rotor laminations facing each other.

6. The motor according to claim 5, characterized in that, The rotor lamination has a first magnetic steel groove (114) and a second magnetic steel groove (115) arranged symmetrically in the same magnetic pole. The radial inner ends of the first magnetic steel groove (114) and the second magnetic steel groove (115) are spaced apart from each other, and the radial outer ends of the first magnetic steel groove (114) and the second magnetic steel groove (115) extend in a direction away from each other.

7. The motor according to claim 6, characterized in that, The rotor lamination is also provided with a third magnet slot (116), which is located between the radial inner end of the first magnet slot (114) and the radial inner end of the second magnet slot (115).

8. The motor according to claim 4, characterized in that, Each of the rotor laminations is provided with rivet holes (112) and flow holes (113) facing each other in the axial direction, and the plurality of rotor laminations are riveted together to form the rotor core (11).

9. A compressor, characterized in that, Includes the motor described in any one of claims 1-8.

10. An air conditioner, characterized in that, Includes the compressor described in claim 9.

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