Disclosure of utility model
The utility model mainly aims to provide a motor, a compressor and refrigeration equipment, and aims to improve the anti-demagnetization capability of the motor.
In order to achieve the above object, the present utility model provides an electric motor comprising:
A stator including a stator core and a winding, the stator having a minimum inner diameter D1, the winding being wound on stator teeth of the stator core, the winding having a number of turns N and a constant a, and
The rotor is rotatably arranged in the stator to form an air gap delta between the stator and the rotor, the maximum outer diameter of the rotor is D2, delta= (D1-D2)/2, the rotor comprises a rotor iron core and a permanent magnet, the rotor iron core is provided with a magnet slot, a magnetic bridge is formed between the magnet slot and the outer periphery of the rotor iron core, the width of the magnetic bridge is t, the permanent magnet is arranged in the magnet slot, the length of the permanent magnet is L,1.9 is less than or equal to (Nxt)/(21.5 xa x delta x L2) is less than or equal to 2.0, when the windings are in star connection, a=1, and when the windings are in angle connection, a=1.732.
In one embodiment, the number of turns N of the winding is in the range of 50< N <150.
In one embodiment, the width t of the magnetic bridge ranges from 0.35mm < t <0.6mm.
In one embodiment, the width L of the permanent magnet ranges from 1mm < L <2mm.
In one embodiment, the width L of the permanent magnet is in the range of 1.3mm < L <1.5mm.
In one embodiment, the delta ranges from 0.45mm < delta <0.7mm.
In one embodiment, the permanent magnet has a remanence Br of 0.5.ltoreq.tXBr.ltoreq.1.0.
In one embodiment, the remanence Br of the magnet is 1.3T to 1.5T when the temperature of the permanent magnet is 20 ℃.
In an embodiment, the stator teeth are provided with a plurality of stator teeth, the stator core further comprises an annular stator yoke, the plurality of stator teeth are arranged at intervals along the circumferential direction of the inner ring surface of the stator yoke so as to form stator slots between any two adjacent stator teeth, the windings are wound on the stator teeth and are positioned in the stator slots, the number of slots of the stator slots is Q, the pole pair number of the rotor is P, and the number of pole pairs of the rotor is 6N multiplied by Q multiplied by P/(100 multiplied by L) multiplied by 10.
In one embodiment, the number Q of the stator slots is 15.ltoreq.Q.ltoreq.18.
In one embodiment, the pole pair number of the rotor is P, and P is more than or equal to 5 and less than or equal to 6.
In one embodiment, the number of slots per pole per phase of the motor is Q, the number of phases of the motor is m, q=q/(2×m×p), Q <1.
The utility model also provides a compressor comprising the motor.
The utility model also provides refrigeration equipment comprising the compressor.
The technical scheme of the utility model improves the anti-demagnetizing capability of the motor by controlling the mutual matching of the width t of the magnetic bridge, the width delta of the air gap, the width L of the permanent magnet, the number of turns N of the winding and the winding constant a when the windings are connected in different modes, and limits (Nxt)/(21.5 xaxdelta xL2) to be less than or equal to 1.9 (Nxt)/(21.5 xaxdelta xL2) to be less than or equal to 2.0, so that the demagnetizing current is increased, and the anti-demagnetizing capability of the motor is further improved.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear are referred to in the embodiments of the present utility model), the directional indications are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture, and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B "including a scheme, or B scheme, or a scheme where a and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
Generally, as the number of turns of the motor winding increases, the resistance of the motor decreases, the current increases, and a stronger magnetic field is generated. However, this does not mean that the more turns, the stronger the anti-demagnetizing ability of the motor. In fact, when the number of turns increases to a certain extent, the magnetic flux distribution of the motor will be more uniform and the magnetic density (magnetic flux per unit area) will be correspondingly reduced, which may lead to a higher tendency of the motor to demagnetize under the action of an external magnetic field. Moreover, the inductance of the motor is a parameter closely related to the number of winding turns. When the number of turns increases, the inductance increases and the inductance increases. This helps to stabilize the current and voltage of the motor and to improve the power factor of the motor. However, too high an inductance may also subject the motor to a greater electromagnetic shock during start-up or operation, possibly increasing the risk of demagnetization. Secondly, when the width of the magnetic bridge of the rotor is smaller, the demagnetizing resistance of the permanent magnet may be stronger, because the magnetic force lines are more likely to directly pass through the silicon steel sheets between the magnetic barriers at this time, and the magnetic leakage is reduced. However, too small a width of the magnetic bridge may result in a decrease in the rated electromagnetic torque of the motor because the path of the magnetic flux lines through the magnetic bridge is reduced. Then, the air gap of the motor is also a factor affecting the anti-demagnetizing capability of the motor, and a smaller air gap length may improve the anti-demagnetizing capability and efficiency of the motor, but may increase manufacturing cost and difficulty. A larger air gap length may reduce manufacturing costs and difficulty, but may reduce performance and efficiency of the motor. Furthermore, the length of the permanent magnets affects the design of the motor's magnetic circuit. The rationality of the magnetic circuit design directly affects the performance and anti-demagnetizing capability of the motor. Therefore, in the design of the motor 1, a proper width t of the magnetic bridge 212, a proper air gap delta, a proper width L of the permanent magnet, and a proper number of winding turns N need to be selected to cooperate with each other to improve the anti-demagnetizing capability of the motor 1.
The utility model proposes an electric machine 1.
Referring to fig. 1 and 2, in an embodiment of the present utility model, the motor 1 includes a stator and a rotor 200, the minimum inner diameter of the stator 100 is D1, the maximum outer diameter of the rotor 200 is D2, the stator includes a stator core 100 and windings, the windings are wound on the stator teeth 110 of the stator core 100, the number of turns of the windings is N, the constant of the windings is a, the rotor 200 is rotatably disposed in the stator to form an air gap δ between the stator and the rotor 200, the rotor 200 includes a rotor core 210 and a permanent magnet 220, the rotor core 210 is provided with a magnet slot 211, a magnetic bridge 212 is formed between the magnet slot 211 and the outer periphery of the rotor core 210, the width of the magnetic bridge 212 is t, the permanent magnet 220 is disposed in the magnet slot 211, the length of the permanent magnet 220 is L,1.9 is less than or equal to (n×t)/(21.5×δ×l2), the windings are less than or equal to 2.0, and when the windings are in a=1, the motor is in series connection, the utility model is in series, the utility model is illustrated in fig. 3, and when referring to fig. 1.4, the series connection winding is in the utility model, the schematic diagram is in series connection 1.4.
The present utility model improves the anti-demagnetization capability of the motor 1 by controlling the mutual matching of the width t of the magnetic bridge 212, the air gap delta, the width L of the permanent magnet, the number of winding turns N, and the winding constant a when the windings are connected in different ways, and referring to fig. 5 and 6, fig. 5 is a table of calculation data of (n×t)/(21.5×a×δ×l2) and experimental data of current values when the demagnetization rate is 3%. Fig. 6 is a graph showing the change of the current value with (n×t)/(21.5×a×δ×l2) at the demagnetizing rate of 3%. As can be seen from fig. 5 and 6, when the ratio of (n×t)/(21.5×a×δ×l2) is smaller than 2, the current value is gradually increased with an increase in the ratio of (n×t)/(21.5×a×δ×l2) and reaches the maximum value when the ratio of (n×t)/(21.5×a×δ×l2) is equal to 2, whereas when the ratio of (n×t)/(21.5×a×δ×l2) is larger than 2, the current value is in a decreasing trend, and referring to fig. 5, when the ratio of (n×t)/(21.5×a×δ×l2) is in a larger value, the current value is in a range of 32A to 33A, and therefore, (n×t)/(21.5×a×δ×l2) is limited to 1.9 (n×t)/(21.5×a×δ×l2) +.0, the current is advantageously increased to a great demagnetization resistance of 1.
When the windings are connected in series in star, a in (n×t)/(21.5×a×δ×l2) takes a value of 1, whereas when the windings are connected in series in angle, a in (n×t)/(21.5×a×δ×l2) takes a value of 1.732. The width t of the magnetic bridge 212 refers to the minimum distance of the magnet slot 211 from the outer edge of the rotor 200. The permanent magnet width L refers to the distance between two parallel side walls in the width direction of the permanent magnet, the width of the permanent magnet includes the width of the angle rounded corner, and for a shaped permanent magnet, a pentagonal permanent magnet such as a unfilled corner refers to the distance between two parallel side walls.
Further, the stator teeth 110 are provided with a plurality of stator teeth, the stator core 100 further includes an annular stator yoke 120, the plurality of stator teeth 110 are arranged at intervals along the circumferential direction of the inner ring surface of the stator yoke 120, so as to form stator slots 130 between any two adjacent stator teeth 110, the windings are wound around the stator teeth 110 and are positioned in the stator slots 130, the number of slots of the stator slots 130 is Q, and the pole pair number of the rotor 200 is P, and 6 n×q×p/(100×l) < 10.
Referring to fig. 7 and 8, fig. 7 is a table of calculation data of nxq×p/(100×l) and experimental data of the maximum operation rotation speed of the motor 1 and the efficiency of the motor 1. Fig. 8 is a diagram showing the maximum operating speed of the motor 1 and the efficiency of the motor 1 as a function of nxq×p/(100×l). As is apparent from fig. 7 and 8, the maximum operating speed of the motor 1 gradually decreases as the value of nxqxp/(100×l) increases, and the efficiency of the motor 1 gradually increases as the value of nxqxp/(100×l) increases, and when 6+.nqxp/(100×l) +.10, both the maximum operating speed of the motor 1 and the efficiency of the motor 1 are at relatively good values, and when nxqxp/(100×l) is equal to 8, both the maximum operating speed of the motor 1 and the efficiency of the motor 1 can reach good values.
Alternatively, the number Q of the stator slots 130 may be in the range of 15.ltoreq.Q.ltoreq.18, and it is understood that the number Q of the stator slots 130 in this range may provide relatively balanced performance. Neither too little to affect the efficiency and torque of the motor 1 nor too much results in a significant increase in manufacturing costs. Also, limiting the number of slots Q of the stator slots 130 between 15 and 18 helps to provide a more uniform magnetic field distribution, thereby reducing magnetic field non-uniformity and improving motor efficiency and performance. Secondly, limiting the number Q of slots of the stator slots 130 to 15 to 18 can make the magnetic field of the motor 1 more uniform, reduce fluctuation of the magnetic field, and thus reduce noise of the motor 1. At the same time, it also helps to reduce vibration of the electric machine 1. The 15 to 18 slot motor 1 may be more advantageous in terms of manufacturing costs as compared to the higher number of stator slots 130 slots motor 1 because they do not require excessive winding coils and insulating materials, reducing manufacturing difficulties and costs. Limiting the number Q of stator slots 130 to 15 to 18 can improve the efficiency and torque density of the motor. While increasing the number Q of stator slots 130 may further improve these performance parameters, relatively high efficiencies and torques have been achieved in the range of 15 to 18.
Alternatively, the pole pair number of the rotor 200 is P, and P is more than or equal to 5 and less than or equal to 6, and the motor 1 with the pole pair number P between 5 and 6 can achieve better balance between torque and rotating speed. Compared with a motor 1 with a smaller pole pair number (such as a 2-pole motor), the motor 1 with the pole pair number P between 5 and 6 has higher torque and lower rotating speed, and is suitable for application scenes requiring high torque and lower speed. Compared with a motor with more pole pairs (such as 8 poles or more), the motor 1 with the pole pair number P between 5 and 6 can avoid the problems of the increase of the motor body, the increase of the rotor inertia and the like caused by the excessive pole number, thereby keeping higher efficiency.
Alternatively, the number of slots per pole of the motor 1 is Q, the number of slots per phase of the motor 1 is m, q=q/(2×m×p), Q <1, it can be understood that the number of slots per pole is equal to the ratio of the number of slots of the stator slot 130 to 2 times the product of the number of pole pairs of the rotor 200 and the number of phases of the motor 1, and the number of slots per pole is made smaller than 1, so that the fractional slot motor is integrally formed, and the cogging torque induced by the permanent magnetic field of the rotor 200 can be effectively weakened under the action of the fractional slot motor. Moreover, the fractional slot motor can effectively improve the equivalent slot number of each pole and each phase. This means that a fractional slot motor can achieve better distribution performance at the same slot count, so that the motor waveform is closer to a sine wave. This contributes to an improvement in efficiency and performance of the motor 1. Second, fractional slot machines can effectively attenuate the per-pole magnetic pulse vibrations due to changes in the air gap permeance, thereby reducing the pulse amplitude value. This helps to improve the electromotive force waveform and reduce the pulse vibration loss, improving the operation efficiency and stability of the motor 1. The fractional slot motor uses fewer slots to obtain the same distribution performance as an integer slot winding with a large number of slots, so the slots are relatively fewer, and the manufacturability is better. This contributes to reduction in manufacturing cost of the motor 1 and improvement in production efficiency. Further, the torque characteristics of fractional slot machines are generally better and torque ripple is smaller. This is because fractional slot motors can optimize the magnetic field distribution, reduce harmonic components, and thereby reduce torque ripple. This makes the slot motor advantageous in applications where high precision control and stable operation are required.
Alternatively, the remanence of the permanent magnet 220 is Br, 0.5.ltoreq.tXBr.ltoreq.1.0, referring to FIGS. 9 and 10, FIG. 9 is a table of experimental data of values of tXBr and magnitudes of force densities of the motor. Fig. 10 is a graph showing the change of the force density amplitude of the motor with t×br. As can be seen from fig. 9 and 10, when t×br is smaller than 0.75, the force density amplitude of the motor 1 gradually decreases as the value of t×br increases, whereas when t×br is larger than 0.75, the force density amplitude of the motor 1 gradually increases as the value of t×br increases, and when 0.5+.t×br+.1.0, the value of the force density amplitude of the motor 1 is relatively small.
For the remanence Br of the permanent magnet 220, the larger the remanence is, the smaller current is required to achieve the required torque when the motor 1 runs, so that the larger the torque generated by the motor 1 under the same current is, the efficiency of the motor 1 is improved, in addition, the magnitude of the remanence also influences the vibration and noise of the motor 1, and the proper remanence can reduce the vibration and noise of the motor 1 and improve the running stability of the motor 1. It can be seen from fig. 9 and 10 that defining 0.5 t×br 1.0 makes it possible to make the magnitude of the force density amplitude of the motor relatively small, so that it is possible to ensure optimal performance of the motor 1 during design and manufacturing.
In one embodiment, after the permanent magnet 220 material, the proper width T of the magnetic bridge 212, the proper air gap delta, the proper permanent magnet width L, the proper winding number N and the winding constant a of the windings in different connection modes are reasonably set according to the technical scheme of the utility model, the remanence of the permanent magnet 220 is 1.3T to 1.5T when the temperature of the permanent magnet 220 is 20 ℃. The remanence is the meaning of the magnetic field strength that the permanent magnet 220 maintains itself after removing the external magnetic field. The remanence of 1.3T to 1.5T means that the permanent magnet 220 has strong magnetism at room temperature, and can generate a significant magnetic field. Therefore, the motor 1 with the reasonable permanent magnet 220 material, the proper magnetic bridge 212 width t, the reasonable air gap delta and the reasonable permanent magnet width L can be obviously shown, the magnetic strength of the permanent magnet 220 is higher, the magnetic performance of the permanent magnet 220 is further improved, and the performance and the energy efficiency of the motor 1 are further improved.
Referring to fig. 1 and 2, further, the rotor core 210 includes a plurality of rotor 200 laminations stacked in an axial direction, and the stator core 100 includes a plurality of stator laminations stacked in the axial direction, so that when the stator core 100 and the rotor core 210 are processed, only the plurality of stator laminations or the rotor 200 laminations are processed, and then the plurality of stator laminations and rotor 200 lamination parts are assembled into the stator core 100 and the rotor core 210, the difficulty of processing the stator laminations and the rotor 200 lamination parts is reduced compared with processing one complete stator core 100 and rotor core 210, thereby facilitating the automatic production of the stator core 100 and the rotor core 210 through an automatic production line, and reducing the production cost.
In an embodiment, the rotor core 210 and the stator core 100 may be made of different materials or shapes, so as to meet the requirements of different processing technologies of the stator and the rotor 200, and facilitate selecting appropriate punching sheets to form the rotor core 210 and the stator core 100 according to the performance requirement of the motor 1, so as to ensure good performance of the electrodes, and improve the application range of the motor 1. In another embodiment, the stator laminations stacked into the stator core 100 are identical to the rotor 200 laminations stacked into the rotor core 210, thereby facilitating mass production of the laminations and reducing manufacturing costs.
Further, the punched sheet is made of soft magnetic material, and the soft magnetic material can realize larger magnetization intensity by using smaller external magnetic field, has low coercive force and high magnetic permeability, is beneficial to reducing the loss of the stator core 100 and/or the rotor core 210, namely, the iron loss of the motor 1, and is beneficial to improving the performance of the motor 1. Specifically, the punching sheet is a silicon steel sheet, and it is understood that the punching sheet may be made of other materials.
In order to ensure that the rotor core 210 does not have the problem of scattering or interlayer misalignment, in the present embodiment, a plurality of rivet holes are provided in the rotor core 210. The fixing strength between the punching sheets of the rotor 200 can be met through the matching of the rivet and the rivet hole, so that the problem of interlayer dislocation of the punching sheets of the rotor 200 in the subsequent processing process is avoided.
It should be noted that, in order to reduce or even avoid the problem of interlayer eddy current conduction caused by the stacked rivet structure, the stacked rivet mode can be replaced by a glue adhesion mode between the punching sheets of the rotor 200, so that the insulating surface layer of the punching sheet of the rotor 200 at the rivet hole is not damaged, thereby avoiding the problem of interlayer eddy current conduction, but the glue is expensive and the production efficiency of the production line is low, so that the glue is not applied to the motor 1 of the air conditioner compressor.
The permanent magnet 220 is made of rare earth materials, and the permanent magnet 220 made of the rare earth materials has the advantages that 1, the high-temperature stability is that the coefficient of the residual magnetic induction strength of the rare earth permanent magnet materials along with the temperature change can be small under the condition of temperature rise. Meanwhile, under the condition of a proper process, the Curie temperature of certain rare earth permanent magnetic materials such as neodymium iron boron can reach 850 ℃, wherein the Curie temperature (Curie temperature, tc) refers to the temperature at which the spontaneous magnetization intensity in the magnetic materials is reduced to zero, which ensures that the magnetic materials can still work normally at high temperature. 2. The rare earth permanent magnet material has high magnetic energy product, residual magnetism and high coercive force. For example, the magnetic energy product of the NdFeB permanent magnet 220 is 27-50 MGOe, and is the permanent magnet material with the highest magnetic property at present. 3. The characteristic of the demagnetization curve is that the demagnetization curve of the rare earth material is basically straight line relative to the traditional permanent magnet material, and the demagnetization curve and the recovery curve are basically coincident, which is helpful for realizing more stable performance in application.
In this embodiment, the rotor core 210 is further provided with a shaft hole and a through hole, the shaft hole is used for installing a transmission shaft so as to drive the transmission object to rotate, after the motor 1 is used for a long time, the temperature of the motor is easy to rise, and then the permanent magnet 220 is easy to demagnetize, and further the permanent magnet 220 loses magnetism or reduces magnetism, so in this embodiment, a refrigerant flows through the through hole on the rotor core 210, and the temperature of the rotor core 210 can be reduced through the refrigerant, so that the permanent magnet 220 is maintained in an optimal range, and further the performance of the motor 1 is improved.
In this embodiment, the number of turns N of the winding is 50< N <150, and it can be understood that limiting the number of turns of the winding between 50 and 150 is beneficial to the shape fit of the winding and the stator slot 130, so as to improve the slot filling rate of the stator slot 130, and limiting the number of turns of the winding between 50 and 150 can avoid excessive turns of the winding, resulting in excessive resistance of the winding, and can reduce the material cost of the motor 1 while improving the efficiency of the motor 1.
Further, the width t of the magnetic bridge 212 is in the range of 0.35mm < t <0.6mm, and firstly, limiting the width t of the magnetic bridge 212 to be between 0.35mm and 0.6mm is beneficial to ensuring the rigidity of the rotor 200, so that the rigidity of the rotor 200 is enough to support the rotor 200 to run at a high speed, and limiting the width t of the magnetic bridge 212 to be between 0.35mm and 0.6mm can ensure the rigidity of the rotor 200 and simultaneously reduce the material consumption, thereby reducing the cost of the rotor 200. Furthermore, limiting the width t of the bridge 212 to between 0.35mm and 0.6mm allows for adjustment of the magnetic field distribution, reducing magnetic leakage and thus improving the magnetic field effect. If the width t of the magnetic bridge 212 is less than or equal to 0.35mm, too small a width t of the magnetic bridge 212 easily results in difficulty in maintaining structural strength at a higher rotation speed than the rotor 200, and if the width t of the magnetic bridge 212 is greater than or equal to 0.6mm, the width of the magnetic bridge 212 is too large, so that not only material cost is increased, but also magnetic leakage is increased, and efficiency of the motor 1 is reduced.
In one embodiment, the width L of the permanent magnet 220 is in the range of 1mm < L <2mm. It will be appreciated that too short a width L of the permanent magnet 220 may result in insufficient magnetic field strength of the motor 1 and lower efficiency of the motor 1, and that too long a length may result in not only increased weight of the motor 1, reduced efficiency of the motor 1, but also increased cost of the motor 1. The width L of the permanent magnet 220 is limited between 1mm and 2mm, so that the production cost is reduced, and the efficiency of the motor 1 is guaranteed. If the width L of the permanent magnet 220 is <1mm, the magnetic field strength of the motor 1 is insufficient, resulting in a decrease in efficiency of the motor 1. If the width L of the permanent magnet 220 is greater than 2mm, the weight of the motor 1 increases, and the efficiency of the motor 1 decreases, and at the same time, the cost of the motor 1 increases.
Further, the width L of the permanent magnet 220 is in the range of 1.3mm < L <1.5mm, so that the utilization rate of the permanent magnet 220 can reach a better level, and the motor efficiency can be optimized.
Wherein the minimum inner diameter of the stator 100 is D1, the maximum outer diameter of the rotor 200 is D2, the air gap of the motor 1 is δ= (D1-D2)/2, the air gap δ is in the range of 0.45mm < δ <0.7mm, and it is understood that the efficiency of the motor 1 is reduced due to too much decrease or increase of the air gap δ. Because an excessively small air gap δ increases friction loss inside the motor 1, and an excessively large air gap δ not only causes weakening of the magnetic field strength and decreases the efficiency of the motor 1, but also causes unstable rotation of the motor 1, causing collision inside the motor 1 and increasing vibration. The air gap delta is limited between 0.45mm and 0.7mm, so that the efficiency of the motor 1 is guaranteed while the internal operation stability of the rotor 200 is guaranteed. If the air gap δ is smaller than 0.45mm, not only the efficiency of the motor 1 is reduced, but also the friction loss inside the motor 1 is increased. When the air gap δ is greater than 0.7mm, the rotor 200 is liable to be unstable in rotation, and the inside of the motor 1 is caused to collide, so that the vibration increases.
In one embodiment, the magnetic field direction of the permanent magnets 220 is parallel to the radial direction of the rotor core 210, that is, the rotor topology is a radial structure, because the radial structure has the advantages of 1 and small leakage factor, that is, the radial structure helps to reduce leakage of magnetic flux outside the rotor 200 due to the radial structure, so that leakage factor is reduced. A smaller leakage factor means that more magnetic flux can be effectively utilized for generating electromagnetic torque, improving the efficiency of the motor 1. 2. The rotor 200 does not need to adopt an isolation measure, namely, the radial structure is designed to ensure that the permanent magnets 220 are closely arranged on the rotor 200, so that the possibility of magnetic flux leakage is reduced, and therefore, no additional isolation measure is needed to prevent the influence of magnetic flux on other parts of the motor 1. This simplifies the structure of the motor 1 and reduces the manufacturing cost. 3. The polar arc coefficient is easy to control, and in the radial structure, the polar arc coefficient can be easily controlled by adjusting the shape, the size and the number of the permanent magnets 220, so that the performance of the motor 1 is accurately controlled. This helps to meet different application requirements and optimize the performance of the motor 1. 4. The mechanical strength of the rotor 200 is high, and the radial structure makes the permanent magnets 220 uniformly distributed on the iron core of the rotor 200, which helps to improve the mechanical strength of the rotor 200. The stronger mechanical strength means that the rotor 200 can withstand a larger torque and a higher rotational speed, improving the reliability and durability of the motor 1. 5. The rotor 200 is not easily deformed after the permanent magnets 220 are installed, and the permanent magnets 220 are tightly embedded in the core of the rotor 200 due to the radial structure, which helps to reduce deformation of the rotor 200 at high-speed rotation. The stable rotor 200 shape helps to keep the performance of the motor 1 stable, reducing vibration and noise.
The utility model also provides a compressor, which comprises a motor, wherein the specific structure of the motor refers to the embodiment, and as the compressor adopts all the technical schemes of all the embodiments, the compressor at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.
The utility model also provides a refrigeration device which comprises a compressor, wherein the specific structure of the compressor refers to the embodiment, and as the refrigeration device adopts all the technical schemes of all the embodiments, the refrigeration device at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.
The foregoing description is only exemplary embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the present utility model.