CN111725923A - Motor and household appliance - Google Patents
Motor and household appliance Download PDFInfo
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- CN111725923A CN111725923A CN202010730334.XA CN202010730334A CN111725923A CN 111725923 A CN111725923 A CN 111725923A CN 202010730334 A CN202010730334 A CN 202010730334A CN 111725923 A CN111725923 A CN 111725923A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The application provides a motor and a household appliance; a motor including a stator and a rotor; the stator comprises a stator core, the stator core comprises a stator yoke and Z stator teeth, a stator slot is formed between every two adjacent stator teeth, and a coil is wound on each stator tooth; the rotor comprises a rotor core, the rotor core comprises a shaft sleeve, 2p fan-shaped parts and a connecting bridge, a rotor slot is formed between every two adjacent fan-shaped parts, and a permanent magnet is arranged in each rotor slot; the profile of sector one side that deviates from the axle sleeve has main segmental arc and the supplementary section that links to each other with main segmental arc, and main segmental arc sets up with the axle sleeve is concentric, and supplementary section is located the inboard of main segmental arc place circle. This application motor is through setting up main segmental arc and supplementary section on rotor core's the sector to set up main segmental arc and rotor with one heart, and supplementary section is located the inboard of main segmental arc place circle, in order to realize reducing 2 frequency multiplication radial forces, and then noise reduction guarantees that the motor has higher power density simultaneously.
Description
Technical Field
The application belongs to the technical field of household appliances, and particularly relates to a motor and a household appliance.
Background
The built-in brushless direct current motor is widely applied to household appliances due to simple structure, high reliability and high power density. Along with the increase of the power density of the brushless direct current motor, the corresponding 2-frequency radial force is increased, and the corresponding 2-frequency radial vibration noise is also obviously increased. Therefore, on the premise of ensuring the high power density of the motor, the 2-frequency multiplication radial force guided by the main magnetic field of the motor is reduced to balance the noise and the performance of the motor, and the method is an important direction for the research and the improvement of the current motor.
Disclosure of Invention
An object of the embodiments of the present application is to provide a motor, so as to solve the problem that 2-frequency multiplication radial force is large in the motor in the related art.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions: providing an electric machine comprising a stator and a rotor disposed in the stator; the stator comprises a stator core, the stator core comprises a stator yoke and Z stator teeth connected with the stator yoke, a stator slot is formed between every two adjacent stator teeth, a coil is wound on each stator tooth, and Z is a positive integer greater than or equal to 2; the rotor comprises a rotor core, the rotor core comprises a shaft sleeve, 2p fan-shaped parts arranged on the peripheral side of the shaft sleeve and a connecting bridge for connecting each fan-shaped part with the shaft sleeve, a rotor groove is formed between every two adjacent fan-shaped parts, a permanent magnet is arranged in each rotor groove, and p is a positive integer; the fan-shaped part deviates from the profile of axle sleeve one side have main segmental arc and with the supplementary section that main segmental arc links to each other, main segmental arc with the axle sleeve sets up with one heart, supplementary section is located the inboard of main segmental arc place circle.
In an alternative embodiment, the main arc segment has a main arc angle a that satisfies the following equation:
K*B<a<B；
K＝GCD(Z，2p)/LCM(Z，2p)；
B＝360°/2；
wherein K is a polar trough common factor; b is the electrical angle occupied by each magnetic pole; GCD (Z, 2p) is the greatest common divisor of the number of stator slots and the number of rotor slots; LCM (Z, 2p) is the least common multiple of the number of stator slots and the number of rotor slots.
In an optional embodiment, the auxiliary sections are respectively arranged at two ends of the main arc section.
In an alternative embodiment, the auxiliary section comprises a straight section or/and a curved section or/and an arc section.
In an alternative embodiment, the stator teeth have an intrados surface with a center offset from a center of the sleeve.
In an alternative embodiment, the center of the intrados surface is offset from the center of the sleeve by a distance greater than the radius of the rotor.
In an alternative embodiment, the distance by which the center of the intrados surface deviates from the center of the shaft sleeve is in the range of 50-110 mm.
In an alternative embodiment, in the radial direction of the bushing: the maximum distance between one side of the fan-shaped part, which is far away from the shaft sleeve, and the stator teeth forms a maximum air gap Dmax, the minimum distance between one side of the fan-shaped part, which is far away from the shaft sleeve, and the stator teeth forms a minimum air gap Dmin, and the maximum air gap and the minimum air gap satisfy the following relation:
2.0<Dmax/Dmin<2.4。
in an alternative embodiment, the width of the slot opening of the stator slot on the side close to the rotor is W, the width of the slot opening of the rotor slot on the side close to the stator is M, and W and M satisfy the following relation:
0.9M*2p≤W*Z≤1.1M*2p。
in an alternative embodiment, the width of the connecting bridge is E, the outer diameter of the rotor is Dr, and E and Dr satisfy the following relation:
0.007<E/Dr<0.0085。
it is another object of embodiments of the present application to provide a household appliance including a motor as described in any of the above embodiments.
The motor that this application embodiment provided has: compared with the prior art, this application motor is through setting up main segmental arc and supplementary section on the sector with rotor core to set up main segmental arc and rotor with one heart, and supplementary section is located the inboard of main segmental arc place circle, in order to realize reducing 2 frequency multiplication radial force, and then noise abatement, guarantee simultaneously that the motor has higher power density.
The embodiment of the application provides a domestic appliance's beneficial effect lies in: compared with the prior art, the household appliance of the application uses the motor, and can have larger power and lower noise.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or exemplary technical descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic cross-sectional structural diagram of a motor according to an embodiment of the present disclosure;
fig. 2 is a schematic cross-sectional structural diagram of a motor according to an embodiment of the present application;
FIG. 3 is a schematic view of a portion of the motor of FIG. 2;
FIG. 4 is a schematic view of a portion of the rotor of FIG. 2;
FIG. 5 is a schematic view of the stator teeth of FIG. 2;
FIG. 6 is a graph of frequency 2 radial force and fundamental air gap flux density amplitude as a function of the main arc angle of the rotor sector for a motor provided in accordance with an embodiment of the present application;
FIG. 7 is a graph of frequency 2 radial force and fundamental airgap flux density magnitude as a function of minimum airgap for a conventional increased airgap to attenuate frequency 2 radial force;
FIG. 8 is a graph of 3 harmonic flux density relative phase versus main arc angle for a rotor sector for a motor provided in accordance with an embodiment of the present application;
FIG. 9 is a graph of 3 rd harmonic flux density of a motor as a function of the main arc angle of the rotor sector provided by an embodiment of the present application;
FIG. 10 is a graph of back emf distortion rate as a function of fundamental air gap flux density amplitude for different stator tooth inner surface shapes provided in the embodiments of the present application;
fig. 11 is a graph of distortion rate of a motor according to an embodiment of the present application as a function of eccentricity of intrados surfaces of stator teeth;
FIG. 12 is a graph of motor efficiency and distortion rate as a function of Dmax/Dmin provided by an embodiment of the present application;
fig. 13 is a schematic diagram of an optimization result of adapting the tooth space of the stator of the motor to the notch of the rotor according to the embodiment of the present application.
Fig. 14 is a partial structural schematic view of another rotor provided in an embodiment of the present application.
Fig. 15 is a partial structural schematic view of a third rotor according to an embodiment of the present application.
Fig. 16 is a partial structural schematic view of a fourth rotor provided in the embodiment of the present application.
Wherein, in the drawings, the reference numerals are mainly as follows:
100-a motor;
10-a stator; 11-a coil; 12-a stator core; 13-a stator yoke; 14-stator teeth; 141-intrados; 15-stator slots;
20-a rotor; 21-a permanent magnet; 22-rotor core; 23-a shaft sleeve; 24-sectors; 241-main arc segment; 242-auxiliary section; 2421-straight line segment; 2422-arc section; 2423-curve segment; 25-a connecting bridge; 26-rotor slots.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
In the description of the present application, "a plurality" means two or more unless specifically limited otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
In the description of the present application, it is to be understood that the terms "center", "width", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
Reference throughout this specification to "one embodiment," "some embodiments," or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Referring to fig. 1 to 3, fig. 1 is a schematic cross-sectional structural diagram of a motor 100 according to an embodiment of the present disclosure. Fig. 2 is a schematic cross-sectional view of the motor 100, and auxiliary lines and some reference numerals are added to the cross-sectional view in fig. 2 for convenience of explanation. Fig. 3 is an enlarged view of a portion of fig. 2 for clarity and illustration.
Referring to fig. 1 to 3, a motor 100 provided in the present application will now be described. The motor 100 includes a stator 10 and a rotor 20, and the rotor 20 is located in the stator 10 to drive the rotor 20 to rotate through the stator 10. The stator 10 includes a stator core 12, the stator core 12 includes a stator yoke 13 and Z stator teeth 14, Z is a positive integer and is greater than or equal to 2, and each stator tooth 14 is connected to the stator yoke 13. Specifically, the stator teeth 14 and the stator yoke 13 may be integrally formed to ensure the connection strength of the stator teeth 14 and the stator yoke 13. Of course, in some embodiments, the stator teeth 14 and the stator yoke 13 may be separately machined and then welded or spliced together. The stator 10 has Z stator slots 15, that is, the number of the stator slots 15 is equal to the number of the stator teeth 14, so that the stator slots 15 are formed between two adjacent stator teeth 14. Each stator tooth 14 is wound with a coil 11 to form an excitation structure. The rotor 20 includes a rotor core 22, the rotor core 22 includes a shaft sleeve 23, 2p sectors 24 and a connecting bridge 25 connecting each sector 24 and the shaft sleeve 23, a rotor slot 26 is formed between two adjacent sectors 24, the number of rotor slots 26 is 2p, that is, the number of rotor slots 26 is equal to the number of sectors 24, and a permanent magnet 21 is mounted in each rotor slot 26, so that the rotor 20 can form 2p magnetic poles, even if the rotor 20 forms p pairs of magnetic poles, p is a positive integer. One side of the sector 24 is the side of the sector 24 away from the shaft sleeve 23; the profile of one side of the sector 24 has a main arc segment 241 and an auxiliary segment 242, the auxiliary segment 242 is connected to the main arc segment 241, and the auxiliary segment 242 is located inside the circle where the main arc segment 241 is located, so that, along the radial direction of the rotor 20, the distance from each point on the auxiliary segment 242 to the same point on the stator teeth 14 is smaller than the distance from each point on the main arc segment 241 to the corresponding point on the stator teeth 14, so that each magnetic pole on the rotor core 22 mainly has a main electrical angle, i.e. a main electrical arc angle, and the main arc segment 241 plays a main role when acting with the stator 10, so that the range of the main magnetic field generated by the main arc segment is relatively small, thereby reducing the large 2-frequency radial force caused by the main magnetic field and further reducing the vibration noise while ensuring the motor 100.
Compared with the prior art, the motor 100 provided by the embodiment of the application has the advantages that the main arc segment 241 and the auxiliary segment 242 are arranged on the fan-shaped part 24 of the rotor core 22, the main arc segment 241 and the rotor 20 are concentrically arranged, the auxiliary segment 242 is located on the inner side of the circle where the main arc segment 241 is located, 2 frequency doubling radial force is reduced, noise is reduced, and meanwhile the motor 100 is guaranteed to have high power density.
In one embodiment, referring to fig. 2 and 3, the main arc segment 241 has a main arc angle a, which refers to an electrical angle corresponding to the main arc segment 241, and the main arc angle a satisfies the following formula:
K*B<a<B；
K＝GCD(Z，2p)/LCM(Z，2p)；
B＝360°/2；
wherein K is a polar trough common factor; b is the electrical angle occupied by each magnetic pole; GCD (Z, 2p) is the greatest common divisor of the number of stator slots 15 and the number of rotor slots 26; LCM (Z, 2p) is the least common multiple of the number of stator slots 15 and the number of rotor slots 26; that is, the pole slot common factor is the ratio of the greatest common divisor of the number of stator slots 15 and the number of rotor slots 26 to the least common multiple of the number of stator slots 15 and the number of rotor slots 26; the electrical angle occupied by each pair of magnetic poles is 360 deg.. The main arc angle a is larger than the product of the common factor of the pole slots and the electrical angle occupied by each pole, and is smaller than the electrical angle occupied by each pole.
According to the electromagnetic principle of the motor 100, the air gap flux density is the root cause of generating radial force, the source generating 2-frequency-doubled radial force has harmonic air gap flux density with the time difference of 2 besides the fundamental wave air gap flux density with the highest amplitude, and the amplitude of the higher harmonic air gap flux density is small relative to the amplitude of the fundamental wave. Making the main arc angle a larger than the product of the pole slot common factor and the electrical angle occupied by each pole and smaller than the electrical angle occupied by each pole; the flux density amplitude and phase of each lower harmonic that generates a 2 times frequency radial force are at appropriate values, for example: the 3 rd harmonic flux density has a larger amplitude, and the phase thereof is the same as the fundamental wave, so that the 2 nd harmonic radial force part with a larger amplitude generated only by the interaction of the fundamental wave magnetic field is just offset, and the 2 nd harmonic radial force of the motor 100 is greatly reduced. That is, in the embodiment of the present application, by limiting the main arc angle of the main arc segment 241 of the sector 24 of the rotor core 22, the large 2-frequency radial vibration noise caused by the main magnetic field can be reduced on the premise of protecting the performance of the motor 100.
Referring to fig. 6, fig. 6 is a graph of the amplitude of the fundamental air gap flux density and the 2-times radial force of the motor 100 according to the embodiment of the present disclosure as a function of the main arc angle of the sector 24 of the rotor 20; in the figure 2 frequency-doubled radial directionThe force density corresponds to the fundamental wave air gap flux density amplitude, which is also called the air gap flux density fundamental wave amplitude. The abscissa in the figure is the main arc angle of the rotor 20 in degrees; the left ordinate in the figure is the air gap flux density in T (Tesla); the right ordinate is the radial force density in N/mm2. As can be seen from the figure, when the main arc angle a of the rotor 20 increases, the fundamental air gap flux density amplitude increases first and then decreases slightly, and overall, the fundamental air gap flux density amplitude changes relatively smoothly with the main arc angle a, the 2-times radial force density decreases gradually, and the 2-times radial force density decreases significantly from 30 degrees to 70 degrees and then tends to be stable.
In the traditional method for weakening 2-frequency-doubled radial force, the air gap is generally increased to reduce the magnetic density of the air gap. Referring to FIG. 7, FIG. 7 is a graph illustrating the variation of the 2-octave radial force and the fundamental airgap flux density with the minimum airgap when the conventional increasing airgap is used to attenuate the 2-octave radial force; the abscissa of the graph is the minimum air gap in mm, and the ordinate on the left side of the graph is the air gap flux density in T (Tesla); the right ordinate is the radial force density in N/mm2. As can be seen from the graph, conventionally, the radial force density decreases with the increase of the minimum air gap, i.e. the 2-fold-frequency radial force density decreases with the decrease of the magnetic density amplitude of the fundamental air gap.
As can be seen from comparison between fig. 7 and fig. 6, in the embodiment of the present application, the variation of the fundamental airgap flux density amplitude with the main arc angle a is relatively gradual, and the fundamental airgap flux density amplitude is directly and positively correlated with the performance of the motor 100, so that the radial force density is 4.5 × 104N/mm2For example, the following steps are carried out: the fundamental airgap flux density amplitude corresponding to the conventional method is about 0.51T, while in the solution of the embodiment of the present application, the fundamental airgap flux density amplitude corresponding to the fundamental airgap flux density is about 0.56T, which is increased by about 10% compared with the conventional method, and accordingly, the performance of the motor 100 can be improved by about 10%.
Referring to fig. 8 and 9, fig. 8 is a graph of 3 rd harmonic flux density relative phase of the motor 100 provided by the embodiments of the present application as a function of the main arc angle of the sectors 24 of the rotor 20; the abscissa in the figure is the main arc angle of the rotor 20 in degrees; the ordinate on the left side of the diagram shows the relative phase of the 3 rd harmonic flux density in deg. Fig. 9 is a graph of 3 rd harmonic flux density ratio of the motor 100 as a function of the main arc angle of the sectors 24 of the rotor 20 provided in accordance with an embodiment of the present application; the abscissa in the figure is the main arc angle of the rotor 20 in degrees; the ordinate on the left side in the figure is the 3 rd harmonic magnetic flux density ratio. The 3 rd harmonic flux density ratio refers to the ratio of the 3 rd harmonic flux density to the fundamental wave.
As can be seen from fig. 8 and 9, when the main arc angle a is not higher than 30 °, the 3 rd harmonic flux density relative phase is opposite to the fundamental magnetic field, the 3 rd harmonic flux density accounts for a small proportion of the fundamental, and decreases as the main arc angle of the rotor 20 increases, and thus the 2 nd-frequency radial force decreases in this main arc angle range. When the main arc angle of the rotor 20 is higher than 30 °, the 3 rd harmonic flux density relative phase is the same as the fundamental magnetic field, and the 3 rd harmonic flux density proportion to the fundamental increases as the main arc angle of the rotor 20 increases, so that the 2 nd-frequency radial force continues to decrease in this main arc angle range. When the main arc angle of the rotor 20 is in the range of more than 60 degrees, the 3-order harmonic magnetic density ratio is increased, and the effect of weakening the 2-frequency radial force generated by the main magnetic field is added, so that the effect of reducing the 2-frequency radial vibration noise can be achieved.
In one embodiment, the number of stator slots 15 ranges from 6 to 18, while the number of rotor slots 26 ranges from 6 to 12. The main arc angle of the main arc segment 241 ranges from 60 to 150 degrees. This ensures that the electric machine 100 has a high power density and that the electric machine 100 has a low radial force of 2 x.
In one embodiment, the number of stator slots 15 is 12 and the number of rotor slots 26 is 8. The main arc angle of the main arc segment 241 is 144 degrees, which can optimize the performance of the motor 100 and the 2-octave radial force.
In one embodiment, referring to fig. 4, the two ends of the main arc segment 241 are respectively provided with an auxiliary segment 242, so as to ensure that the structure of the sector 24 of the rotor core 22 on the side away from the shaft sleeve 23 is relatively symmetrical, so as to make the rotation of the rotor 20 more stable.
In one embodiment, referring to fig. 4, the auxiliary section 242 may be a straight section 2421 to facilitate manufacturing.
In one embodiment, referring to fig. 14, the auxiliary segment 242 may also be an arc segment 2422, so that the main arc segment 241 and the auxiliary segment 242 may be smoothly transited. In still other embodiments, the auxiliary segment 242 may also be a curved segment.
In one embodiment, referring to fig. 15, the auxiliary section 242 may be a plurality of connected straight sections 2422.
In one embodiment, the secondary section 242 may be a smooth section of line, such as a straight section 2421, a curved section, or an arcuate section 2422. In still other embodiments, the secondary section 242 may be a continuous multi-segment line, such as a multi-segment straight line segment 2421, a multi-segment curved line segment, or a multi-segment curved line segment 2422. In still other embodiments, referring to fig. 16, the auxiliary section 242 may include a straight section 2421, a curved section 2423 and an arc section 2422. Of course, in some embodiments, the auxiliary section 242 may be a plurality of connected lines, such as may include two or three of the straight section 2421, the curved section 2423, and the curved section 2422, and so on.
Referring to fig. 2, 3 and 5, the auxiliary line f1 is a concentric circle passing through the center line of the intrados 141 of the stator teeth 14, the concentric circle being concentric with the rotor 20. The auxiliary line f2 is a concentric circle passing through the edge of the intrados 141 of the stator tooth 14, and the concentric circle is concentric with the rotor 20. In the figure, an auxiliary line f3 is a concentric circle passing through the main arc 241 of the sector 24 of the rotor core 22, and the concentric circle is concentric with the rotor 20. The auxiliary line f4 is a concentric circle passing through the end of the auxiliary segment 242 of the sector 24 of the rotor core 22 away from the main arc segment 241, and is concentric with the rotor 20. In the radial direction of the sleeve 23: the largest distance between one side of the sector part 24, which is far away from the shaft sleeve 23, and the stator teeth 14 forms a largest air gap Dmax, and the smallest distance between one side of the sector part 24, which is far away from the shaft sleeve 23, and the stator teeth 14 forms a smallest air gap Dmin, so that the distance between the auxiliary line f1 and the auxiliary line f3 is the smallest air gap Dmin; the distance between the auxiliary line f2 and the auxiliary line f4 is the maximum air gap Dmax. The rotor 20 has an outer diameter Dr equal to the diameter of the circle on which the main arc segment 241 of the sector 24 of the rotor core 22 is located. In the figure, the width of the slot opening on the side of the stator slot 15 close to the rotor 20 is W, the width of the slot opening on the side of the rotor slot 26 close to the stator 10 is M, and the width of the connecting bridge 25 isIs E.
Since the sine of the no-load back emf of motor 100 affects the tangential torque ripple of motor 100, the higher the back emf sine, the less the parasitic harmonic currents, and the lower the tangential torque ripple. The distribution of the air gap flux density determines the sine of the no-load back-emf and the shape of the stator teeth 14 and the rotor 20 sectors 24 determines the air gap flux density.
Referring to fig. 10, fig. 10 is a graph of the back electromotive force distortion rate of different inner surface shapes of the stator teeth 14 according to the embodiment of the present application as a function of the magnetic density amplitude of the fundamental air gap; the abscissa in the graph is the amplitude of the air gap flux density fundamental wave in T (Tesla); the ordinate is the back-emf distortion rate in%. In fig. 10, one curve is the trend of the back electromotive force distortion rate corresponding to the straight-line chamfered edge of the stator tooth 14 along with the amplitude of the air gap flux density fundamental wave; the other curve in fig. 10 is a trend of a back electromotive force distortion rate corresponding to the eccentric arc chamfered edge of the stator tooth 14 along with the amplitude of the air gap flux density fundamental wave. The straight chamfered edge of the stator tooth 14 designates the inner surface of the sub-tooth 14 as a planar structure. The eccentric arc chamfered edge of the stator tooth 14 designates the sub-tooth 14 to have the inner arc surface 141, and the center of the inner arc surface 141 is offset from the axis of the rotor 20, that is, the center of the inner arc surface 141 is offset from the center of the shaft sleeve 23.
In one embodiment, referring to fig. 2, 3 and 5, the stator teeth 14 have an inner arc surface 141, the center of the inner arc surface 141 is offset from the center of the bushing 23, and the back electromotive force distortion rate (hereinafter referred to as distortion rate) of the motor 100 can be made lower under the condition that the magnitudes of the airgap flux density fundamental waves are equal.
In one embodiment, referring to fig. 3 and 5, the distance between the center of the intrados 141 of the stator teeth 14 and the center of the shaft sleeve 23 is greater than the radius of the rotor 20, so that the distortion rate can reach a lower value.
Referring to fig. 11, fig. 11 is a graph illustrating a distortion rate of the motor 100 according to the embodiment of the present application as a function of an eccentricity of the intrados 141 of the stator teeth 14; the abscissa in the figure is the eccentricity in mm; the ordinate is the distortion rate in%. The eccentricity specifies the distance by which the center of the intrados surface 141 of the sub-tooth 14 deviates from the center of the shaft sleeve 23. Dr in the figure is the outer diameter of the rotor 20. As can be seen from the figure, when the center of the intrados surface 141 of the stator tooth 14 is offset from the center of the sleeve 23 by a distance greater than the radius of the rotor 20, the distortion rate can be made low.
In one embodiment, the distance by which the center of the intrados surface 141 of the stator teeth 14 is offset from the center of the shaft sleeve 23 is in the range of 50-110mm, so that the distortion rate of the motor 100 is at a low value. Preferably, the center of the intrados 141 of the stator teeth 14 is offset from the center of the sleeve 23 by a distance of 80 mm.
The size of the air gap in the radial direction determines the magnetic field distribution and flux transfer efficiency between the rotor 20 and the stator 10 according to the electromagnetic principles of the machine 100. The smaller the radial dimension of the air gap D, the smaller the corresponding air gap reluctance. The larger the radial dimension of the air gap D, the larger the corresponding air gap reluctance. An excessive air gap reluctance will cause a weakening of the magnetic field in the air gap D, which in turn causes a reduction in the magnetic flux involved in the electromechanical energy conversion and a reduction in the efficiency of the electric machine 100; an excessively small air gap reluctance causes the rotor 20 and the stator 10 to be highly magnetically saturated, which in turn causes an increase in iron loss and a decrease in efficiency of the motor 100. A reasonable air gap D is therefore a key factor in improving the efficiency of the machine 100.
In one embodiment, referring to fig. 2 and 3, in the radial direction of the sleeve 23: the largest distance between the side of sector 24 facing away from sleeve 23 and stator teeth 14 forms the largest air gap Dmax, and the smallest distance between the side of sector 24 facing away from sleeve 23 and stator teeth 14 forms the smallest air gap Dmin.
Referring to fig. 12, fig. 12 is a graph of efficiency and distortion rate of the motor 100 according to the embodiment of the present application as a function of Dmax/Dmin; the abscissa in the graph is the ratio Dmax/Dmin; the left ordinate is the motor 100 efficiency in units%; the right ordinate is the distortion rate in%. As can be seen from the figure, when the ratio of the maximum air gap Dmax to the minimum air gap Dmin is between 2.0 and 2.4, the distortion of the motor 100 can be reduced while the efficiency of the motor 100 is ensured. That is, the maximum air gap and the minimum air gap satisfy the following relation, the distortion rate of the motor 100 can be reduced while the efficiency of the motor 100 is ensured, and the relation is: 2.0< Dmax/Dmin < 2.4.
Preferably, the ratio of Dmax/Dmin is 2.23, the efficiency and small distortion rate of the motor 100 can be secured, and the fabrication can be facilitated.
Since the slot widths of the stator slots 15 and the rotor slots 26 affect the cogging torque of the motor 100, the larger the cogging torque is, the larger the torque ripple of the motor 100 under low load is, and the lower the noise and vibration are.
In one embodiment, referring to fig. 2 and 3, the width of the slot opening of the stator slot 15 near the rotor 20 is W, the width of the slot opening of the rotor slot 26 near the stator 10 is M, and W and M satisfy the following relations:
0.9M*2p≤W*Z≤1.1M*2p；
when the slot width W of the stator slot 15 and the slot width M of the rotor slot 26 satisfy the above-described relational expression, the motor 100 can be ensured to have a small cogging torque.
Referring to fig. 13, fig. 13 is a schematic diagram illustrating an optimization result of the gap between the stator teeth 14 and the rotor slot 26 of the motor 100 according to the embodiment of the present application; in the figure, the abscissa Evaluation refers to the number of different schemes; the ordinate Cost is the degree of difference from the target value. The smaller the ordinate, the closer the solution is to the target value, i.e. the smaller the cogging torque. As can be seen from the figure, W and M satisfy the following relational expression: when W × Z is not less than 0.9M × 2p and not more than 1.1M × 2p, the motor 100 can be ensured to have a small cogging torque.
In one embodiment, a slot width W of 2.8mm for the stator slots 15 and a slot width M of 4.2mm for the rotor slots 26 ensures that the cogging torque of the machine 100 is at a low value.
In one embodiment, referring to fig. 2 and 3, the width of the connecting bridge 25 is E, the outer diameter of the rotor 20 is Dr, and the following relationship is satisfied by E and Dr:
0.007<E/Dr<0.0085。
the connection bridge 25 is an inner magnetic bridge of the rotor core 22, limits the relation between the width of the connection bridge 25 and the outer diameter of the rotor 20, can improve the structural strength of the rotor 20 side, reduces the self-link leakage of the permanent magnet 21, and improves the efficiency of the motor 100.
The motor 100 of the embodiment of the application has higher power density and smaller 2-frequency-multiplication radial force, and can ensure that 2-frequency-multiplication radial vibration noise is smaller, so that the noise and the performance of the motor 100 can be well balanced.
The embodiment of the present application further provides a household appliance including the motor 100 according to any one of the above embodiments. The household appliance using the motor 100 can have a large power and a low noise.
The home appliance of the present application may be an appliance requiring the use of the motor 100, such as a blower, a vacuum cleaner, an air conditioner compressor, a fan, etc.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (11)
1. A motor including a stator and a rotor disposed in the stator; the stator comprises a stator core, the stator core comprises a stator yoke and Z stator teeth connected with the stator yoke, a stator slot is formed between every two adjacent stator teeth, a coil is wound on each stator tooth, and Z is a positive integer greater than or equal to 2; the rotor comprises a rotor core, the rotor core comprises a shaft sleeve, 2p fan-shaped parts arranged on the peripheral side of the shaft sleeve and a connecting bridge for connecting each fan-shaped part with the shaft sleeve, a rotor groove is formed between every two adjacent fan-shaped parts, a permanent magnet is arranged in each rotor groove, and p is a positive integer; the method is characterized in that: the fan-shaped part deviates from the profile of axle sleeve one side have main segmental arc and with the supplementary section that main segmental arc links to each other, main segmental arc with the axle sleeve sets up with one heart, supplementary section is located the inboard of main segmental arc place circle.
2. The electric machine of claim 1, wherein: the main arc segment has a main arc angle a, which satisfies the following formula:
K*B<a<B；
K＝GCD(Z，2p)/LCM(Z，2p)；
B＝360°/2；
wherein K is a polar trough common factor; b is the electrical angle occupied by each magnetic pole; GCD (Z, 2p) is the greatest common divisor of the number of stator slots and the number of rotor slots; LCM (Z, 2p) is the least common multiple of the number of stator slots and the number of rotor slots.
3. The electric machine of claim 1, wherein: the two ends of the main arc section are respectively provided with the auxiliary sections.
4. The electric machine of claim 1, wherein: the auxiliary section comprises a straight section or/and a curved section or/and an arc section.
5. The electric machine of any of claims 1-4, wherein: the stator teeth are provided with inner arc surfaces, and the circle center of each inner arc surface deviates from the circle center of the shaft sleeve.
6. The electric machine of claim 5, wherein: the distance of the circle center of the inner cambered surface deviating from the circle center of the shaft sleeve is larger than the radius of the rotor.
7. The electric machine of claim 6, wherein: the distance range of the circle center of the intrados deviating from the circle center of the shaft sleeve is 50-110 mm.
8. An electric machine as claimed in any of claims 1 to 4, characterized in that, in the radial direction of the bushing: the maximum distance between one side of the fan-shaped part, which is far away from the shaft sleeve, and the stator teeth forms a maximum air gap Dmax, the minimum distance between one side of the fan-shaped part, which is far away from the shaft sleeve, and the stator teeth forms a minimum air gap Dmin, and the maximum air gap and the minimum air gap satisfy the following relation:
2.0≤Dmax/Dmin≤2.4。
9. the electric machine of any of claims 1-4, wherein: the width of the notch of the stator slot close to the rotor side is W, the width of the notch of the rotor slot close to the stator side is M, and the W and M satisfy the following relational expression:
0.9M*2p≤W*Z≤1.1M*2p。
10. the electric machine of any of claims 1-4, wherein: the width of the connecting bridge is E, the outer diameter of the rotor is Dr, and the E and the Dr satisfy the following relational expression:
0.007<E/Dr<0.0085。
11. a household appliance, characterized by: comprising an electrical machine according to any of claims 1-10.
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| CN112421924A (en) * | 2020-11-09 | 2021-02-26 | 广东威灵电机制造有限公司 | Motor and household appliance |
| CN112600326A (en) * | 2020-12-09 | 2021-04-02 | 珠海格力电器股份有限公司 | Permanent magnet synchronous motor and washing machine |
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| CN117650843A (en) * | 2024-01-30 | 2024-03-05 | 陕西旋星电子科技有限公司 | Non-contact optical communication slip ring and optical device side surface arrangement method thereof |
| CN117811299A (en) * | 2024-02-28 | 2024-04-02 | 苏州拓氪科技有限公司 | Harmonic modulation permanent magnet synchronous motor |
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