Motor, compressor, and refrigeration device

Abstract

The present application discloses a motor, a compressor, and a refrigeration device. The motor comprises a stator and a rotor, wherein the stator comprises a stator iron core, the stator iron core comprises a stator yoke and stator teeth, the stator teeth are connected to the stator yoke, the thickness of the stator yoke is W1, and the width of the stator teeth is W2; and the rotor comprises a rotor iron core and permanent magnets, the rotor iron core is rotatably arranged in the stator iron core, magnet slots are formed in the rotor iron core, the permanent magnets are mounted in the magnet slots, the width of the permanent magnets is W3, the thickness of the permanent magnets is t, and the number of permanent magnets on each magnetic pole of the rotor is a, wherein 1.5≤(a*W3*t) / (W1+W2)≤1.9.

Description

Motor, compressor and refrigeration equipment

[0001] The present application claims priority to Chinese Patent Application No. 202410989727.0, filed on July 22, 2024, and Chinese Patent Application No. 202421748848.8, filed on July 22, 2024, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of refrigeration equipment, in particular to a motor, a compressor and a refrigeration equipment. BACKGROUND

[0003] At present, permanent magnet motor technology has been widely used, especially in the field of compressors. However, the efficiency of the permanent magnet motor is an important indicator, which directly affects the efficiency of the compressor. In the motor, the size of the rotor permanent magnet and the design of the stator teeth and stator yoke are important factors affecting the efficiency of the motor. Copper loss and iron loss are the two main losses when the air compressor is working. Copper loss refers to the loss generated by the resistance of the coil when the current passes through the coil, which is related to the coil resistance, current size and frequency. Iron loss is the energy loss caused by the eddy current and hysteresis nonlinearity phenomenon in the magnetic circuit when magnetizing and demagnetizing. The traditional motor structure does not consider the balance of copper loss and iron loss when designing, and when one of them is reduced, the other rises, which cannot achieve high efficiency. TECHNICAL PROBLEM

[0004] The main purpose of the present application is to provide a motor, a compressor and a refrigeration equipment, which aims to balance the copper and iron loss, improve the efficiency of the motor and improve the energy efficiency of the compressor. TECHNICAL SOLUTION

[0005] To achieve the above purpose, the motor provided by the present application comprises:

[0006] a stator, the stator comprising a stator core, the stator core comprising a stator yoke and a stator tooth, the stator tooth being connected to the stator yoke, the thickness of the stator yoke being W1, and the width of the stator tooth being W2; and

[0007] a rotor, the rotor comprising a rotor core and a permanent magnet, the rotor core being rotatably arranged in the stator core, the rotor core being provided with a magnet slot, the permanent magnet being installed in the magnet slot, the width of the permanent magnet being W3, the thickness of the permanent magnet being t, and the number of permanent magnets on each magnetic pole of the rotor being a, 1.5≤(a*W3*t) / (W1+W2)≤1.9.

[0008] In an embodiment, 2

[0009] In an embodiment, when the magnetic circuit structure of the permanent magnet is in a straight line shape, a=1.

[0010] In an embodiment, when the magnetic circuit structure of the permanent magnet is in a V shape, a=2.

[0011] In an embodiment, 0.8

[0012] In an embodiment, 4.5mm

[0013] In an embodiment, 4mm

[0014] In an embodiment, 5mm

[0015] In an embodiment, 0.5mm

[0016] In an embodiment, 1.2mm

[0017] In an embodiment, the stator tooth and the stator yoke enclose to form a stator slot, when the slot number of the stator slot is 15, and the pole pair number of the rotor is 5, 1.3mm

[0018] In an embodiment, the magnetic pole of the permanent magnet is consistent with the radial direction of the rotor core.

[0019] In an embodiment, the stator tooth and the stator yoke enclose to form a stator slot, and the slot number of the stator slot is Q, 15

[0020] In an embodiment, the pole pair number of the rotor is P, and 5

[0021] In an embodiment, the phase number of the motor is m, the slot number of each phase per pole of the motor is q, q=Q / 2mP, q

[0022] The application also provides a compressor comprising the motor as described above.

[0023] The application also provides a refrigeration device comprising the compressor as described above. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0025] Fig. 1 is a structural schematic diagram of an embodiment of the motor provided by the present application;

[0026] Fig. 2 is a partial enlarged view of A in Fig. 1;

[0027] Fig. 3 is a structural schematic diagram of another embodiment of the permanent magnet in Fig. 1;

[0028] Fig. 4 is a structural schematic diagram of the rotor when the permanent magnet is in V shape in Fig. 1;

[0029] Fig. 5 is a structural schematic diagram of the rotor when the permanent magnet is in U shape in Fig. 1;

[0030] Fig. 6 is a comparison diagram of the copper loss, iron loss and motor efficiency of the motor provided by the present application and the motor in the prior art;

[0031] Fig. 7 is a table of the calculation data of (a*W3*t) / (W1+W2) and the experimental data of the corresponding motor efficiency;

[0032] Fig. 8 is a schematic diagram of the motor efficiency changing with (a*W3*t) / (W1+W2);

[0033] Fig. 9 is a table of the calculation data of a*W3 / W2 and the experimental data of the corresponding iron loss;

[0034] Fig. 10 is a schematic diagram of the iron loss efficiency changing with a*W3 / W2;

[0035] Fig. 11 is a table of the calculation data of W1 / W2 and the experimental data of the corresponding stator slot area and motor efficiency;

[0036] Fig. 12 is a schematic diagram of the stator slot area and motor efficiency changing with the value of W1 / W2.

[0037] Explanation of reference signs:

[0038] 10, stator core; 11, stator yoke; 12, stator tooth; 13, stator slot; 21, rotor core; 211, magnet slot; 22, permanent magnet.

[0039] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. Embodiment of the present application

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0041] It should be noted that if the application embodiments have directionality indications (such as up, down, left, right, front, back, etc.), the directionality indications are only used to explain the relative position relationship, movement, etc. between components in a certain posture, and if the certain posture changes, the directionality indications also change accordingly.

[0042] In addition, if the application embodiments have descriptions of "first", "second", etc., the "first", "second", etc. descriptions are only for description purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0043] Referring to FIG. 1, FIG. 3 and FIG. 5, the application proposes an electric machine, comprising:

[0044] A stator, the stator comprises a stator core 10, the stator core 10 comprises a stator yoke 11 and a stator tooth 12, the stator tooth 12 is connected to the stator yoke 11, the thickness of the stator yoke 11 is W1, the width of the stator tooth 12 is W2; and

[0045] A rotor, the rotor comprises a rotor core 21 and a permanent magnet 22, the rotor core 21 is rotatably arranged in the stator core 10, the rotor core 21 is provided with a magnet slot 211, the permanent magnet 22 is installed in the magnet slot 211, the width of the permanent magnet 22 is W3, the thickness of the permanent magnet 22 is t, the number of permanent magnets on each magnetic pole of the rotor is a, 1.5≤(a*W3*t) / (W1+W2)≤1.9.

[0046] The motor in the technical solution of the application comprises a stator and a rotor, the stator core 10 comprises a stator yoke 11 and a stator tooth 12, the stator tooth 12 is connected to the stator yoke 11, the thickness of the stator yoke 11 is W1, the width of the stator tooth 12 is W2, the rotor comprises a rotor core 21 and a permanent magnet 22, the rotor core 21 is rotatably arranged in the stator core 10, the rotor core 21 is provided with a magnet slot 211, the permanent magnet 22 is arranged in the magnet slot 211, the width of the permanent magnet 22 is W3, the thickness of the permanent magnet 22 is t, the number of the permanent magnets on each magnetic pole of the rotor is a, and 1.5≤(a*W3*t) / (W1+W2)≤1.9. The technical solution of the application balances the copper loss and the iron loss by coordinating the relationship between the width and the thickness of the permanent magnet, the width of the stator tooth 12 and the thickness of the stator yoke 11, thereby improving the efficiency of the motor and the energy efficiency of the compressor.

[0047] Further, the thickness of the stator yoke is W1, the slot surface of the stator slot in the stator yoke part is defined as a slot bottom, if the slot bottom is irregularly shaped, the irregular shape can be a combination of multiple straight line segments, a single arc segment or a combination of multiple arc segments, a combination of at least one straight line segment and at least one arc segment, etc., at this time the thickness W1 of the stator yoke represents the minimum distance between the lowest point of the slot bottom and the outer circumferential surface of the stator yoke, wherein the lowest point of the slot bottom represents the point farthest from the center of the slot bottom. If the slot bottom is a single straight line segment, i.e. the slot bottom is arranged straight (at this time, whether the corners of the slot bottom and the two adjacent slot walls are arc-shaped is not considered), at this time the shortest distance between the slot bottom and the center is defined as b, the outer diameter of the stator yoke is R, at this time the thickness W1 of the stator yoke is R / 2-b.

[0048] Referring to FIGS. 2 and 3, further, the thickness t of the permanent magnet is the distance between two parallel sides of the permanent magnet, and the width W3 of the permanent magnet is the distance between the two parallel sides, so when the edge corners of the permanent magnet are arranged with chamfers, the width and the thickness of the permanent magnet are not affected.

[0049] Wherein, a*W3*t is the total area of the permanent magnet on each magnetic pole, (a*W3*t) / (W1+W2) is the distribution of single-pole magnetic flux in the stator tooth 12 and the stator yoke 11. As shown in FIG. 2, when the permanent magnet is in a straight line type, a=1, i.e. a*W3*t=W3*t. As shown in FIG. 4, when the permanent magnet is in a V-shaped type, a=2, a*W3*t=2W3*t, i.e. the total area of the two permanent magnets arranged in a V-shaped type; if the widths of the magnets in each pole are not equal, W3 is the sum of the widths of all magnets in each pole, at this time a=1, W3=x+y. As shown in FIG. 5, when the permanent magnet is in a U-shaped type, a=3, 3*W3*t=3W3*t, i.e. the total area of the three permanent magnets arranged in a U-shaped type; if the widths of the magnets in each pole are not equal, W3 is the sum of the widths of all magnets in each pole, at this time a=1, W3=x+y+z.

[0050] Referring to FIG. 7 and FIG. 8, FIG. 7 is a table of calculated data of (a*W3*t) / (W1+W2) and experimental data of corresponding motor efficiency, and FIG. 8 is a diagram showing the motor efficiency varying with (a*W3*t) / (W1+W2). As shown in FIG. 7 and FIG. 8, when (a*W3*t) / (W1+W2)≤1.7, the motor efficiency increases with the increase of the value of (a*W3*t) / (W1+W2); when (a*W3*t) / (W1+W2)>1.7, the motor efficiency decreases with the increase of the value of (a*W3*t) / (W1+W2); due to the production and processing errors, the actual values of the numbers may be different, and the motor efficiency is above 93.2% to meet the actual requirements, thus in the embodiment, 1.5≤(a*W3*t) / (W1+W2)≤1.9.

[0051] The permanent magnet 22 is made of rare earth material, and the permanent magnet 22 made of rare earth material has the following advantages: 1. High temperature stability: the coefficient of the remanence induction of the rare earth permanent magnet changes with temperature can be very small when the temperature rises. At the same time, the Curie temperature of some rare earth permanent magnets such as neodymium iron boron can reach 850°C under suitable process, which ensures that they can still work normally at high temperature. 2. Superior magnetic properties: rare earth permanent magnets have high magnetic energy product, remanence and high coercivity. For example, the magnetic energy product of neodymium iron boron permanent magnet 22 is between 27-50 MGOe, which is the highest magnetic permanent magnet material at present. 3. Demagnetization curve characteristics: compared with traditional permanent magnets, the demagnetization curve of rare earth material is basically a straight line, and the demagnetization curve and the recovery curve basically coincide, which helps to achieve more stable performance in application. 4. Wide application field: due to the excellent performance of rare earth permanent magnets, they have been widely used in electric vehicles, artificial satellites, radars, micro motors, aviation instruments, electronic watches, seismographs and many other fields.

[0052] In an embodiment, when the magnetic circuit structure of the permanent magnet 22 is in a linear shape, a=1, that is, 1.5≤(W3*t) / (W1+W2)≤1.9. In the linear magnetic circuit structure, the magnetic field distribution is relatively uniform, and there is no obvious local magnetic field enhancement or weakening area; the linear magnetic circuit structure makes the magnetic lines flow in the same direction, so that the flow path of the magnetic lines inside and outside the permanent magnet 22 is relatively direct without too much bending or dispersion, thus the magnetic flux efficiency is higher, which is conducive to realizing efficient energy conversion or transmission; at the same time, the structure of the linear permanent magnet 22 is simple, easy to manufacture and install. In the design and production process, the complexity of processing and assembly can be reduced, thereby improving the production efficiency. The linear permanent magnet 22 can be widely used in various motors, generators, sensors, speakers, compressors and other equipment.

[0053] In another embodiment, when the magnetic circuit structure of the permanent magnet 22 is V-shaped, a = 2, i.e. 1.5≤2(W3*t) / (W1+W2)≤1.9. The V-shaped magnetic circuit structure has a magnetic concentration effect, which can make the magnetic field more concentrated, thereby enhancing the performance of the magnet. Moreover, the V-shaped structure helps to reduce the size and weight of the magnet, and improve the efficiency and stability of the system; this advantage is particularly important in modern equipment that pursues compactness and lightness; at the same time, the V-shaped magnetic circuit structure has a larger magnetic resistance torque, which improves the performance and efficiency of the motor.

[0054] In an embodiment, 2

[0055] Referring to FIG. 9 and FIG. 10, FIG. 9 is a table of calculation data of a*W3 / W2 and corresponding experimental data of iron loss, and FIG. 10 is a schematic diagram of the change of iron loss efficiency with a*W3 / W2. As can be seen from FIG. 9 and FIG. 10, when a*W3 / W2<3, the iron loss of the motor decreases with the increase of a*W3 / W2; when a*W3 / W2>3, the iron loss of the motor increases with the increase of a*W3 / W2; when a*W3 / W2=3, the iron loss of the motor is at the lowest value. Considering that there is a certain error in the actual processing process, when 2

[0056] In an embodiment, 0.8

[0057] Referring to FIG. 11 and FIG. 12, FIG. 11 is a table of calculation data of W1 / W2 and corresponding stator slot 13 area and motor efficiency experimental data, and FIG. 12 is a schematic diagram of the stator slot 13 area and motor efficiency changing with the value of W1 / W2. As shown in FIG. 11 and FIG. 12, when W1 / W2<1.15, the stator slot 13 area and motor efficiency increase with the increase of W1 / W2; when W1 / W2>1.15, the stator slot 13 area and motor efficiency decrease with the increase of W1 / W2; when W1 / W2=1.15, the stator slot 13 area and motor efficiency are at the maximum value; but when 0.8<W1 / W2<1.5, the stator slot 13 area changes little, and the stator slot 13 area and motor efficiency are in a higher range and can meet the requirements in actual work.

[0058] In an embodiment, 4.5mm<W1<8mm. When the width of the stator yoke 11 increases, the stator slot 13 area will correspondingly decrease, thereby causing the wire parallel winding number to decrease, the phase resistance to increase, and the motor copper loss to increase; but the increase of the width of the stator yoke 11 will generally cause the magnetic flux density of the stator tooth 12 to decrease, because the magnetic flux needs to be distributed in a wider area. The decrease of the magnetic flux density helps to reduce the iron loss. Conversely, when the width of the stator yoke 11 decreases, the copper loss will decrease and the iron loss will increase; therefore, in the present embodiment, by reasonably setting the size of the stator yoke 11, the copper loss and iron loss of the motor are balanced, thereby improving the efficiency of the motor and the energy efficiency of the compressor.

[0059] In an embodiment, 4mm<W2<12mm. When the width of the stator tooth 12 increases, the decrease of the magnetic flux density will cause the iron loss under the high-speed low-torque working condition to decrease, because the decrease of the magnetic flux density of the stator tooth 12 causes the excitation current in the motor current to decrease significantly, thereby reducing the iron loss; but the increase of the width of the stator tooth 12 will cause the stator slot 13 space to decrease, the wire parallel winding number to decrease, the phase resistance to increase, and the motor copper loss to increase; when the width of the stator tooth 12 decreases, the stator slot 13 space increases, the wire parallel winding number increases, the phase resistance decreases, and the copper loss decreases; but the decrease of the width of the stator tooth 12 may increase the saturation degree of the stator core magnetic circuit, causing the iron loss to increase; therefore, in the present embodiment, by reasonably setting the width of the stator tooth 12, the copper loss and iron loss of the motor are balanced, thereby improving the efficiency of the motor and the energy efficiency of the compressor.

[0060] In an embodiment, 5mm < W3 < 25mm. If W3 ≥ 25mm, the width of the permanent magnet 22 is large, although the magnetic field strength is high, but the volume of the permanent magnet 22 is increased, thereby increasing the cost of the motor; if W3 ≤ 5mm, the magnetic field strength may not meet the requirements of the motor, therefore, in the present embodiment, 5mm < W3 < 25mm, so that the width of the permanent magnet 22 is reasonably set, thereby reducing the cost of the motor while the magnetic strength of the permanent magnet 22 meets the requirements of the motor.

[0061] In an embodiment, 0.5mm < t < 2.5mm. If t ≥ 2.5mm, the thickness of the permanent magnet 22 is thick, although the magnetic field strength of the permanent magnet 22 is high, but the volume of the permanent magnet 22 is increased, thereby increasing the cost of the motor; if t ≤ 0.5mm, the efficiency of the motor is improved, and the energy efficiency of the compressor is improved, therefore, in the present embodiment, 0.5mm < t < 2.5mm, so that the thickness of the permanent magnet 22 is reasonably set, thereby reducing the cost of the motor while the magnetic strength of the permanent magnet 22 meets the requirements of the motor.

[0062] Further, when 1.2mm < t < 2mm, the thickness of the permanent magnet is further optimized, so that the utilization rate of the magnet can reach a more optimal level, thereby improving the efficiency of the motor and the energy efficiency of the compressor.

[0063] Further, the stator teeth 12 and the stator yoke 11 enclose the stator slot 13, when the number of slots of the stator slot 13 is 15 and the pole pair number of the rotor is 5, 1.3mm < t < 1.5mm. That is, when the stator slot is provided with 15 and the pole pair number of the rotor is 5, the thickness of the permanent magnet is set between 1.3mm and 1.5mm, so that the magnetic field distribution of the motor can be further optimized, thereby further improving the utilization rate of the magnet, thereby improving the efficiency of the motor and the energy efficiency of the compressor.

[0064] Wherein, the stator core 10 is composed of a plurality of stator punching sheets stacked in sequence, and the rotor core 21 is composed of a plurality of rotor punching sheets stacked in sequence, by setting the stator punching sheet and the rotor punching sheet as a plurality, when the stator core 10 and the rotor core 21 are processed, only the plurality of stator punching sheets or rotor punching sheets need to be processed, and then the plurality of stator punching sheet and rotor punching sheet parts are assembled into the stator core 10 and the rotor core 21, compared with processing a complete stator core 10 and a rotor core 21, the difficulty of processing the stator punching sheet and the rotor punching sheet parts is reduced, and the automatic production of the stator core 10 and the rotor core 21 can be realized through the automatic production line, thereby reducing the production cost.

[0065] In an embodiment, the rotor core 21 and the stator core 10 can be of different materials or shapes, so as to meet the requirements of different processing techniques of the stator and the rotor, facilitate selection of appropriate punching sheets to form the rotor core 21 and the stator core 10 according to the performance requirements of the motor, and thus ensure good performance of the motor and improve the wide application range of the motor. In another embodiment, the stator punching sheets stacked to form the stator core 10 are the same as the rotor punching sheets stacked to form the rotor core 21, so as to facilitate mass production of the punching sheets and reduce manufacturing cost.

[0066] In the related art, in order to ensure that the rotor core 21 does not have the problems of sheet separation or layer misalignment, or to ensure that the rotor core 21 does not deform due to layer offset of the rotor core 21 during winding of the coil winding, the motor core is required to have sufficient riveting strength. In order to ensure that the motor core has sufficient riveting strength, in the present embodiment, a plurality of rivet holes are provided on the rotor core 21. The rivet holes and the rivets can meet the fixing strength between the silicon steel sheets, so as to avoid the problem of layer misalignment of the silicon steel sheets in the subsequent processing process.

[0067] In order to reduce or even avoid the problem of layer eddy current conduction caused by the riveting structure, the silicon steel sheets can be bonded by glue instead of riveting, so as to avoid damage to the insulating surface layer of the silicon steel sheets at the rivet holes, and thus avoid the problem of eddy current layer conduction. However, due to the high price of glue and low production efficiency of the production line, the glue has not been applied to the motor of the air conditioner compressor.

[0068] In the present embodiment, the rotor core 21 is also provided with a shaft hole and a flow-through hole. The shaft hole is used to install a transmission shaft, so as to drive the transmission components to rotate. After long-term use of the motor, the temperature of the motor is easily increased, and thus the permanent magnet 22 is easily demagnetized, and thus the permanent magnet 22 loses or reduces the magnetic property. In the present embodiment, the flow-through hole is provided on the rotor core 21, and refrigerant flows through the flow-through hole. The refrigerant can reduce the temperature of the rotor core 21, so as to maintain the permanent magnet 22 within the optimal range, and thus improve the performance of the motor.

[0069] Specifically, the magnetic poles of the permanent magnet 22 are consistent with the radial direction of the rotor core 21, that is, the topology of the rotor is radial, and the rotor core 21 is distributed radially outward. That is, a plurality of the permanent magnets 22 are arranged along the circumferential direction of the rotor core 21, and the plurality of the permanent magnets 22 are arranged in an opposite manner. It should be noted that the two magnetic poles N and S of the permanent magnet 22 are respectively located on the two sides in the thickness direction of the permanent magnet 22.

[0070] The radial topology of the rotor has several advantages; 1. Low leakage coefficient: The radial structure allows the permanent magnets 22 to be arranged along the radial direction of the rotor, which helps to reduce the leakage of magnetic flux outside the rotor, thereby reducing the leakage coefficient. A smaller leakage coefficient means that more magnetic flux can be effectively utilized to generate electromagnetic torque, improving the efficiency of the motor. 2. No need for isolation measures on the rotor: The design of the radial structure allows the permanent magnets 22 to be arranged closely on the rotor, reducing the possibility of magnetic flux leakage, so additional isolation measures are not needed to prevent the influence of magnetic flux on other parts of the motor. This simplifies the structure of the motor and reduces manufacturing costs. 3. Easy to control the pole arc coefficient: In the radial structure, by adjusting the shape, size and number of permanent magnets 22, the pole arc coefficient can be easily controlled, thereby achieving precise control of the performance of the motor. This helps to meet different application requirements and optimize the performance of the motor. 4. High mechanical strength of rotor lamination: The radial structure allows the permanent magnets 22 to be evenly distributed on the rotor core, which helps to improve the mechanical strength of the rotor lamination. Stronger mechanical strength means that the rotor can withstand greater torque and higher speed, improving the reliability and durability of the motor. 5. The rotor is not easy to deform after installing the permanent magnets 22: Because of the radial structure, the permanent magnets 22 are tightly embedded in the rotor core, which helps to reduce the deformation of the rotor when rotating at high speed. Stable rotor shape helps to maintain stable performance of the motor, reducing vibration and noise.

[0071] In an embodiment, the stator teeth 12 and the stator yoke 11 enclose the stator slots 13, and the number of slots Q of the stator slots 13 is 15≤Q≤18. The number of slots Q of the stator slots 13 is in the range of 15≤Q≤18; the number of slots Q of the stator slots 13 in this range can provide relatively balanced performance. Neither too few to affect the efficiency and torque of the motor, nor too many to significantly increase manufacturing costs. Moreover, limiting the number of slots Q of the stator slots 13 to between 15 and 18 helps to provide a more uniform magnetic field distribution, thereby reducing the unevenness of the magnetic field and improving the efficiency and performance of the motor. Secondly, limiting the number of slots Q of the stator slots 13 to 15 to 18 can make the magnetic field of the motor more uniform, reducing the fluctuation of the magnetic field, thereby reducing the noise of the motor. At the same time, it also helps to reduce the vibration of the motor. Compared with motors with higher slot numbers, 15 to 18 slot motors may have an advantage in manufacturing costs, as they do not require excessive winding coils and insulation materials, reducing manufacturing difficulty and cost. Limiting the number of slots Q of the stator slots 13 to 15 to 18 can improve the efficiency and torque density of the motor. Although increasing the number of slots Q of the stator slots 13 can further improve these performance parameters, a relatively high efficiency and torque can already be achieved within the range of 15 to 18 slots.

[0072] Specifically, the rotor has a pole pair number P, 5≤P≤6; the motor with the pole pair number P between 5 and 6 can achieve a better balance between torque and rotating speed. Compared with the motor with a smaller pole pair number, the motor with the pole pair number P between 5 and 6 has a higher torque and a lower rotating speed, and is suitable for application scenarios requiring high torque and low speed. Compared with the motor with a larger pole pair number, the motor with the pole pair number P between 5 and 6 can avoid problems such as an increased motor body and an increased rotor inertia caused by an excessive pole number, thereby maintaining a high efficiency.

[0073] In an embodiment, the motor has a phase number m, and the motor has an every-pole-per-phase-slot number q, q=Q / 2mP, q<1. The every-pole-per-phase-slot number q is equal to a ratio of a slot number of the stator slot to a multiple of a product of the pole pair number of the rotor and the phase number of the motor, and the every-pole-per-phase-slot number q is less than 1, so that a fractional-slot motor can be formed as a whole, and under the action of the fractional-slot motor, the cogging torque induced by the rotor permanent magnet magnetic field can be effectively weakened. Moreover, the fractional-slot motor can effectively improve the equivalent slot number per pole per phase. This means that under the same slot number, the fractional-slot motor can obtain better distribution performance, so that the motor waveform is closer to a sine wave. This helps to improve the efficiency and performance of the motor. Secondly, the fractional-slot motor can effectively weaken the every-pole magnetic flux pulse vibration caused by the air gap magnetic permeability change, thereby reducing the pulse vibration amplitude. This helps to improve the electromotive force waveform and reduce the pulse vibration loss, and improves the operating efficiency and stability of the motor. Since the fractional-slot motor uses fewer slots to obtain the same distribution performance as the integer-slot winding with many slots, the slot number is relatively small, and the processability is good. This helps to reduce the manufacturing cost of the motor and improve the production efficiency. Furthermore, the torque characteristics of the fractional-slot motor are generally good, and the torque fluctuation is small. This is because the fractional-slot motor can optimize the magnetic field distribution, reduce the harmonic component, and thus reduce the torque fluctuation. This makes the fractional-slot motor have an advantage in occasions requiring high-precision control and stable operation.

[0074] After the width and thickness of the permanent magnet 22, the width of the stator tooth 12, the thickness of the stator yoke 11, and the proportional relationship are reasonably set through the technical solutions of the present application, the residual magnetism of the magnet is 1.3T to 1.5T when the temperature of the permanent magnet 22 is 20℃. The residual magnetism means the magnetic field strength of the permanent magnet 22 itself after removing the external magnetic field. The residual magnetism of 1.3T to 1.5T indicates that the permanent magnet 22 has strong magnetism at room temperature and can generate a significant magnetic field. Therefore, it can be clearly seen that the motor after reasonably coordinating the width and thickness of the permanent magnet, the width of the stator tooth 12, and the thickness of the stator yoke 11 has higher magnetic strength of the permanent magnet 22, thereby improving the magnetic ability of the permanent magnet 22 and the performance and energy efficiency of the motor.

[0075] The application further provides a compressor, which comprises a motor, and the specific structure of the motor is as described in the above embodiments. Since the compressor in the technical scheme of the application adopts all the technical schemes of the above embodiments, it at least has all the beneficial effects brought by the technical schemes of the above embodiments, which will not be repeated here.

[0076] The application further provides a refrigeration equipment, which comprises the compressor, and the specific structure of the compressor is as described in the above embodiments. The refrigeration equipment can be classified into compression refrigeration equipment, absorption refrigeration equipment, vapor injection refrigeration equipment, heat pump refrigeration equipment and electric heating refrigeration device, etc. The refrigeration equipment mainly comprises a compressor, an expansion valve, an evaporator, a condenser and accessories, a pipeline, etc. Such as a refrigerator, an air conditioner, etc. Since the compressor in the technical scheme of the application adopts all the technical schemes of the above embodiments, it at least has all the beneficial effects brought by the technical schemes of the above embodiments, which will not be repeated here.

[0077] The above is only an exemplary embodiment of the application, and does not limit the patent scope of the application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, which is made based on the technical concept of the application and the content of the specification and drawings, is included in the patent protection scope of the application.

Claims

1. An electric machine, wherein, The motor comprises: a stator comprising a stator core, the stator core comprising a stator yoke and a stator tooth connected to the stator yoke, the stator yoke having a thickness of W1 and the stator tooth having a width of W2; and a rotor comprising a rotor core and a permanent magnet, the rotor core being rotatably arranged in the stator core, the rotor core being provided with a magnet slot, and the permanent magnet being arranged in the magnet slot, the permanent magnet having a width of W3 and a thickness of t, and the number of permanent magnets on each magnetic pole of the rotor being a, 1.5≤(a*W3*t) / (W1+W2)≤1.

9.

2. The electric machine of claim 1, wherein, 2<a*W3 / W2<3.

5.

3. The electric machine of claim 1 or 2, wherein, When the magnetic circuit structure of the permanent magnet is in a straight line shape, a=1.

4. The electric machine of any one of claims 1 to 3, wherein, When the magnetic circuit structure of the permanent magnet is in a V-shaped line shape, a=2.

5. The electric machine of any one of claims 1 to 4, wherein, 0.8<W1 / W2<1.

5.

6. The electric machine of any one of claims 1 to 5, wherein, 4.5mm<W1<8mm.

7. The electric machine of any one of claims 1 to 6, wherein, 4mm<W2<12mm.

8. The electric machine of any one of claims 1 to 7, wherein, 5mm<W3<25mm.

9. The electric machine of any one of claims 1 to 8, wherein, 0.5mm<t<2.5mm.

10. The electric machine of any one of claims 1 to 9, wherein, 1.2mm<t<2mm.

11. The electric machine of any one of claims 1 to 10, wherein, The stator tooth and the stator yoke enclose a stator slot, when the slot number of the stator slot is 15 and the pole pair number of the rotor is 5, 1.3mm<t<1.5mm.

12. The electric machine of any one of claims 1 to 11, wherein, The magnetic pole of the permanent magnet is consistent with the radial direction of the rotor core.

13. The electric machine of any one of claims 1 to 12, wherein, The stator tooth and the stator yoke enclose a stator slot, and the slot number of the stator slot is Q, 15≤Q≤18.

14. The electric machine of any one of claims 1 to 13, wherein, The pole pair number of the rotor is P, 5≤P≤6.

15. The electric machine of claim 14, wherein, The phase number of the motor is m, and the slot number per pole per phase of the motor is q, q=Q / 2mP, q<1.

16. A compressor, wherein, The compressor comprises the motor according to any one of claims 1 to 15.

17. A refrigeration appliance, wherein, The refrigeration equipment comprises the compressor according to claim 16.

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