Electric motor and intelligent electric appliance comprising same

Abstract

The utility model provides a kind of motor and the intelligent electrical appliance containing it, it includes: punching piece body, punching piece body has inner edge and outer edge;Permanent magnet slot, the number of permanent magnet slot is P, P permanent magnet slot ring is set on punching piece body and is close to outer edge setting, permanent magnet slot includes permanent magnet section and second magnetic separation groove, second magnetic separation groove is located at the both ends of permanent magnet section;First magnetic separation groove, first magnetic separation groove is set on outer edge, first magnetic separation groove is recessed setting from outer edge towards the axis of punching piece body, the recessed direction of first magnetic separation groove corresponds with the position of adjacent two second magnetic separation grooves, the number of first magnetic separation groove is P, the number of second magnetic separation groove is 2P. Various magnetic separation grooves are used in cooperation, the line counter electromotive force of motor rotor is reduced, its THDu (harmonic total distortion rate)≤2.3%, to improve motor counter electromotive force sinusoidal, improve permanent magnet utilization, reduce motor output torque ripple.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor and an intelligent electrical appliance containing the same. Background Technology

[0002] Alternating pole permanent magnet motors are widely used in various fields. However, under the same power density, existing alternating pole permanent magnet motors have relatively low permanent magnet utilization and relatively high motor rotor costs due to unreasonable magnetic circuit design. They cannot simultaneously achieve multiple dimensions such as reducing leakage flux coefficient, reducing harmonic content, reducing torque ripple, and increasing functional density. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of relatively low utilization rate of permanent magnets and unreasonable magnetic circuit design in the prior art, and to provide a motor and an intelligent electrical appliance containing the same.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] An electric motor, the electric motor comprising:

[0006] A lamination body, the lamination body having an inner edge and an outer edge;

[0007] The permanent magnet slots are P in number, and the P permanent magnet slots are arranged in a ring around the lamination body and close to the outer edge. Each permanent magnet slot includes a permanent magnet segment and a second magnetic isolation slot, and the second magnetic isolation slot is located at both ends of the permanent magnet segment.

[0008] The first magnetic isolation groove is disposed on the outer edge. The first magnetic isolation groove is recessed from the outer edge toward the axis of the lamination body. The recessed direction of the first magnetic isolation groove corresponds to the position of the two adjacent second magnetic isolation grooves. The number of the first magnetic isolation grooves is P, and the number of the second magnetic isolation grooves is 2P.

[0009] In this scheme, by setting P permanent magnet slots, P first magnetic isolation slots, and 2P second magnetic isolation slots on the lamination body, compared with the traditional motor rotor, the combination of multiple magnetic isolation slots reduces the harmonics of each order of the linear back electromotive force generated by the motor rotor, with its THDu (total harmonic distortion) ≤ 2.3%, thereby improving the sinusoidal nature of the motor's back electromotive force, increasing the utilization rate of permanent magnets, and reducing the torque ripple of the motor output. At the same time, the combination of multiple magnetic isolation slots can reduce the leakage magnetic coefficient of the motor rotor, increase the main air gap magnetic flux amplitude, and improve the efficiency and power density of the motor.

[0010] Preferably, the motor further includes a third magnetic isolation groove, which is located on the lamination body and is disposed opposite to the first magnetic isolation groove. The second magnetic isolation groove is located between the first magnetic isolation groove and the third magnetic isolation groove. The third magnetic isolation groove has a pentagonal structure, and two adjacent second magnetic isolation grooves and the third magnetic isolation groove are spaced apart to form a magnetic isolation bridge.

[0011] In this scheme, by adding a third magnetic isolation slot, the sinusoidal nature of the motor's back electromotive force is further improved, the utilization rate of permanent magnets is increased, and the torque pulsation of the motor output is reduced. Furthermore, the magnetic isolation bridge can meet the rotor rotation stress while also greatly reducing the motor's leakage magnetic coefficient.

[0012] Preferably, a center line is provided between two adjacent second magnetic isolation slots, and the two adjacent second magnetic isolation slots are arranged symmetrically about the center line. The central angle between the two adjacent center lines is α, where α ranges from 360 / 2π°. The diameter of the circumference of the second end of the first magnetic isolation slot is D1 mm, the diameter of the circumference of the first end of the first magnetic isolation slot is D1-1 mm, the central angle of the first end of the first magnetic isolation slot is γ, and the central angle of the second end of the first magnetic isolation slot is β. Wherein, D1 is the diameter of the outer edge, the value of γ ranges from α / 18 ≤ γ ≤ 41α / 180°, and the value of β ranges from α / 10 ≤ β ≤ 2α / 9°.

[0013] In this scheme, the size and distribution of the first magnetic isolation slot are restricted to adjust the pole arc coefficient of the rotor, thereby reducing the leakage magnetic coefficient and torque fluctuation of the motor.

[0014] Preferably, the central angle between two adjacent second magnetic isolation slots is δ, and the central angle of the third magnetic isolation slot is ε, wherein the value of δ is in the range of β<δ≤β+1.69°, and the value of ε is in the range of 2α / 9°.

[0015] In this scheme, by limiting the size and distribution of the second magnetic isolation slot, the pole arc coefficient of the rotor can be further adjusted, thereby reducing the leakage magnetic coefficient and torque fluctuation of the motor.

[0016] Preferably, the central angle of the third magnetic isolation groove is ζ, the value of ζ is in the range of α / 6°, and the diameter of the circumference of the groove edge of the third magnetic isolation groove facing the axis of the lamination body is ≥55mm.

[0017] In this scheme, by limiting the size and distribution of the third magnetic isolation slot, the self-coupling coefficient of the permanent magnet's N and S poles is reduced, thereby increasing the air gap magnetic flux density amplitude of the motor and improving the motor's power and efficiency.

[0018] Preferably, the permanent magnet segment has a first glue storage tank and a second glue storage tank. The first glue storage tank is located in the middle region of the permanent magnet segment, and the second glue storage tank is disposed on both sides of the first glue storage tank and located in the edge region of the permanent magnet segment. The first glue storage tank is an isosceles trapezoidal tank, and the second glue storage tank is a semi-circular tank.

[0019] In this solution, the above-mentioned settings are used to effectively fix each position of the permanent magnet within the permanent magnet segment.

[0020] Preferably, the size of the magnetic bridge formed by the second magnetic isolation groove and the first magnetic isolation groove is W1, and the value of W1 is 0.4 < W1 ≤ 0.5 mm.

[0021] In this scheme, the above settings limit the spacing between two adjacent second magnetic isolation slots, the distance between the slot edge of the second magnetic isolation slot facing the first magnetic isolation slot and the first magnetic isolation slot, and the size of the magnetic isolation bridge formed by the second magnetic isolation slot and the third magnetic isolation slot. This can satisfy the rotor rotation stress while greatly reducing the leakage magnetic coefficient of the motor.

[0022] Preferably, the motor further includes P first weight-reducing holes, second weight-reducing holes, and third weight-reducing holes. The first weight-reducing hole is an oblong hole with a first outer diameter of D2 and a second outer diameter of D3. Both ends of the first weight-reducing hole are semi-circular structures with a radius of D4. The second weight-reducing hole is located between two adjacent first weight-reducing holes. The circumference of the center of the second weight-reducing hole is (D2+D3) / 2mm, and the diameter of the second weight-reducing hole is D5. The third weight-reducing hole is located in the same radial direction as the second weight-reducing hole. The circumference of the third weight-reducing hole is 9*(D2+D3) / 20mm, and the diameter of the third weight-reducing hole is D6. Wherein, D2=9*D1 / 13mm, D3=7*D1 / 13mm, D4=D2-D3mm, D5=D4-1mm, and D6=D4+1mm.

[0023] In this solution, the above-mentioned settings reduce the rotor's moment of inertia and uniformize its mass, locating the center of gravity at the rotor's axis to minimize imbalance and reduce the likelihood of rotor eccentricity, thus increasing the motor's operational reliability. Furthermore, the combination of various weight-reducing holes also lowers the motor's weight and material costs.

[0024] A smart appliance comprising a motor as described above.

[0025] In this solution, the intelligent electrical appliance includes the aforementioned motor. Compared to traditional motor rotors, it employs a combination of multiple magnetic isolation slots to reduce the harmonics of each order of the linear back electromotive force generated by the motor rotor, achieving a THDu (Total Harmonic Distortion) ≤ 2.3%. This enhances the sinusoidal nature of the motor's back electromotive force, improves the utilization rate of permanent magnets, and reduces torque ripple in the motor output. Simultaneously, the use of multiple magnetic isolation slots reduces the leakage flux coefficient of the motor rotor, increases the main air gap flux amplitude, and improves the motor's efficiency and power density.

[0026] Furthermore, the smart appliance containing the motor can be used to absorb cooking fumes. For example, the smart appliance can be controlled by a voice module, which is equipped with a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the motor to start the smart appliance, thereby achieving intelligent regulation and improving motor efficiency, thus obtaining a better cooking fume absorption effect and improving the user experience.

[0027] The positive and progressive effects of this utility model are as follows: By setting P permanent magnet slots, P first magnetic isolation slots, and 2P second magnetic isolation slots on the lamination body, compared with the traditional motor rotor, the combination of multiple magnetic isolation slots reduces the harmonics of each order of the linear back electromotive force generated by the motor rotor, with its THDu (total harmonic distortion) ≤ 2.3%, thereby improving the sinusoidal nature of the motor's back electromotive force, increasing the utilization rate of permanent magnets, and reducing the torque pulsation of the motor output; at the same time, the combination of multiple magnetic isolation slots can reduce the leakage magnetic coefficient of the motor rotor, increase the main air gap magnetic flux amplitude, and improve the efficiency and power density of the motor. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the amplitude at different orders in a preferred embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram of the structure of the lamination body according to a preferred embodiment of the present invention.

[0030] Figure 3 This is a schematic diagram of the structure of a magnetic isolation bridge according to a preferred embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] Film processing body 1

[0033] Inner edge 11

[0034] Outer edge 12

[0035] Permanent magnet slot 2

[0036] Permanent magnet segment 21

[0037] First glue storage tank 211

[0038] Second glue storage tank 212

[0039] Second magnetic shielding groove 22

[0040] Magnetic bridge 221

[0041] First magnetic shielding groove 31

[0042] Third magnetic shielding groove 32

[0043] First weight reduction hole 4

[0044] Second weight reduction hole 5

[0045] Third weight reduction hole 6 Detailed Implementation

[0046] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0047] This embodiment provides a motor, the specific structure of which is as follows: Figure 1 and Figure 2 As shown, the motor includes:

[0048] The lamination body 1 has an inner edge 11 and an outer edge 12;

[0049] The permanent magnet slot 2 has a quantity of P. The P permanent magnet slots 2 are arranged in a ring around the lamination body 1 and are located near the outer edge 12. The permanent magnet slot 2 includes a permanent magnet section 21 and a second magnetic isolation slot 22. The second magnetic isolation slot 22 is located at both ends of the permanent magnet section 21.

[0050] The first magnetic isolation groove 31 is disposed on the outer edge 12. The first magnetic isolation groove 31 is recessed from the outer edge 12 toward the axis of the stamping body 1. The recessed direction of the first magnetic isolation groove 31 corresponds to the position of the two adjacent second magnetic isolation grooves 22. The number of first magnetic isolation grooves 31 is P, and the number of second magnetic isolation grooves 22 is 2P.

[0051] Specifically, the lamination body 1 has a circular structure with an inner edge 11 and an outer edge 12. The inner edge 11 is the edge of the shaft hole at the axis, and the outer edge 12 is the edge of the lamination body 1 away from the inner edge 11. P permanent magnet slots 2 are arranged around the axis of the lamination body 1, and the P permanent magnet slots 2 are spaced apart from each other. The permanent magnet slot 2 has a permanent magnet section 21 located in the middle area and second magnetic isolation slots 22 located at both ends of the permanent magnet section 21. The permanent magnet section 21 is used to accommodate the permanent magnet of the rotor. Two adjacent second magnetic isolation slots 22 are arranged opposite each other in the direction of the permanent magnet slot 2 arranged around the axis of the lamination body 1.

[0052] In addition, the lamination body 1 is provided with a first magnetic isolation groove 31, the number of which is P, and the number of second magnetic isolation grooves 22 is 2P. Compared with the traditional motor rotor, its redesigned rotor structure improves the utilization rate of permanent magnets at the same power density. The first magnetic isolation groove 31 is located on the outer edge 12 and is recessed towards the axis of the lamination body 1. The positions of the first magnetic isolation groove 31 and the two adjacent second magnetic isolation grooves 22 correspond to each other. Figure 2 In this embodiment, the use of multiple magnetic isolation slots in combination and the limitation of their number reduces the harmonics of each order of the back electromotive force generated by the motor rotor, with a THDu (Total Harmonic Distortion) of ≤2.3%, thereby improving the sinusoidal nature of the motor's back electromotive force, increasing the utilization rate of permanent magnets, and reducing the torque pulsation of the motor output. At the same time, by increasing the number of magnetic isolation slots, the first magnetic isolation slot 31 and the second magnetic isolation slot 22 can be combined to reduce the leakage magnetic coefficient of the motor rotor, increase the main air gap magnetic flux amplitude, and improve the efficiency and power density of the motor.

[0053] like Figure 3 As shown, in this embodiment, the motor also includes a third magnetic isolation groove 32, which is located on the lamination body 1 and is disposed opposite to the first magnetic isolation groove 31. The second magnetic isolation groove 22 is located between the first magnetic isolation groove 31 and the third magnetic isolation groove 32. The third magnetic isolation groove 32 has a pentagonal structure. Two adjacent second magnetic isolation grooves 22 and the third magnetic isolation groove 32 are spaced apart and form a magnetic isolation bridge 221.

[0054] Specifically, the second magnetic isolation groove 22 has an irregular structure, with the ends of two adjacent second magnetic isolation grooves 22 spaced apart and their groove edges parallel to each other. The groove edge of the second magnetic isolation groove 22 facing the first magnetic isolation groove 31 has the same concave shape as the first magnetic isolation groove 31, and the groove edge of the second magnetic isolation groove 22 facing the first magnetic isolation groove 31 is parallel to the first magnetic isolation groove 31. Similarly, the groove edge of the second magnetic isolation groove 22 facing the third magnetic isolation groove 32 has the same shape as the two side edges of the pentagonal third magnetic isolation groove 32. That is, a magnetic isolation bridge 221 is formed between the groove edge of the second magnetic isolation groove 22 facing the third magnetic isolation groove 32 and the third magnetic isolation groove 32. The triangular region of the third magnetic isolation groove 32 is correspondingly located on both sides of the two adjacent second magnetic isolation grooves 22, thereby ensuring that the concave direction of the first magnetic isolation groove 31 corresponds to the position of the two adjacent second magnetic isolation grooves 22.

[0055] In this embodiment, in addition to the first magnetic isolation groove 31 and the second magnetic isolation groove 22, a third magnetic isolation groove 32 is also provided. By cooperating with the first magnetic isolation groove 31, the second magnetic isolation groove 22 and the third magnetic isolation groove, the sinusoidal nature of the motor's back electromotive force is further improved, the utilization rate of the permanent magnet is increased, and the torque pulsation of the motor output is reduced.

[0056] Furthermore, in this embodiment, there is a center line between two adjacent second magnetic isolation grooves 22, and the two adjacent second magnetic isolation grooves 22 are symmetrically arranged about the center line. The central angle between the two adjacent center lines is α, where the value of α ranges from 360 / 2π°. The diameter of the circumference of the second end of the first magnetic isolation groove 31 is D1mm, the diameter of the circumference of the first end of the first magnetic isolation groove 31 is D1-1mm, the central angle of the first end of the first magnetic isolation groove 31 is γ, and the central angle of the second end of the first magnetic isolation groove 31 is β. Wherein, D1 is the diameter of the outer edge 12, the value of γ ranges from α / 18≤γ≤41α / 180°, and the value of β ranges from α / 10≤β≤2α / 9°.

[0057] Specifically, the first magnetic isolation groove 31 can be regarded as an approximately isosceles trapezoid. The second end of the first magnetic isolation groove 31, that is, the circumference of the first magnetic isolation groove 31 without a recess, is the outer edge 12, and the diameter of the outer edge 12 is D1mm. The diameter of the circumference of the first end of the first magnetic isolation groove 31, that is, the end with the smaller isosceles trapezoid along the recess direction of the first magnetic isolation groove 31, is D1-1mm. In other words, the distance between the first end and the second end of the first magnetic isolation groove 31 is 0.5mm, thereby limiting the size of the first magnetic isolation groove 31.

[0058] A centerline exists between two adjacent second magnetic isolation slots 22, and the two adjacent second magnetic isolation slots 22 are arranged symmetrically about the centerline. The central angle between the two adjacent centerlines is α, where α ranges from 360 / 2π°. α is the angle occupied by a single permanent magnet slot 2 on the lamination body 1. Based on this, the central angle of the first end of the first magnetic isolation slot 31 is γ, and the central angle of the second end of the first magnetic isolation slot 31 is β, where γ ranges from α / 18 ≤ γ ≤ 41α / 180°, and β ranges from α / 10 ≤ β ≤ 2α / 9°. By restricting the distribution of the first magnetic isolation slots 31, the pole arc coefficient of the rotor is adjusted, thereby reducing the leakage flux coefficient and torque fluctuation of the motor.

[0059] In this embodiment, the central angle of two adjacent second magnetic isolation slots 22 is δ, and the central angle of the magnetic isolation bridge 221 is ε. The value of δ ranges from β < δ ≤ β + 1.69°, and the value of ε ranges from 2α / 9°. Since the second magnetic isolation slots 22 are located within the permanent magnet slots 2 and at both ends of the permanent magnet segment 21, limiting the range of the central angle δ restricts the size and distribution of the second magnetic isolation slots 22. This, combined with the limitation on the size and distribution of the first magnetic isolation slots 31, further adjusts the rotor's pole arc coefficient, thereby reducing the motor's leakage flux coefficient and torque fluctuation.

[0060] In this embodiment, the central angle of the third magnetic isolation groove 32 is ζ, the value of ζ is α / 6°, and the diameter of the circumference of the groove edge of the third magnetic isolation groove 32 facing the axis of the stamping body 1 is ≥55mm.

[0061] Specifically, the third magnetic isolation slot 32 is arranged symmetrically about the centerline, with the triangular region of the third magnetic isolation slot 32 facing the magnetic isolation bridge 221. The diameter of the circumference of the third magnetic isolation slot 32 away from the edge of the triangular region is ≥55mm. By restricting the size and distribution of the third magnetic isolation slot 32, the self-coupling coefficient of the permanent magnet's N and N poles is reduced, and the air gap magnetic flux density amplitude of the motor is increased, thereby improving the motor's power and efficiency.

[0062] In this embodiment, the permanent magnet segment 21 has a first glue storage tank 211 and a second glue storage tank 212. The first glue storage tank 211 is located in the middle region of the permanent magnet segment 21, and the second glue storage tank 212 is disposed on both sides of the first glue storage tank 211 and located in the edge region of the permanent magnet segment 21. The first glue storage tank 211 is an isosceles trapezoidal tank, and the second glue storage tank 212 is a semi-circular tank.

[0063] Specifically, the first glue storage groove 211 is located in the middle region of the permanent magnet section 21 and is an isosceles trapezoidal groove. The isosceles trapezoidal groove is recessed towards the axis of the stamping body 1. The smaller end of the first glue storage groove 211 has a size of 0.7 mm, the larger end has a size of 1 mm, the distance between the smaller and larger ends is 0.25 mm, and the height of the isosceles trapezoidal groove is 0.25 mm. In addition, the permanent magnet section 21 also includes two second glue storage grooves 212. The second glue storage grooves 212 are semi-circular grooves, recessed towards the axis of the stamping body 1, and have a radius of 0.5 mm. By setting glue storage grooves at different positions within the permanent magnet section 21, and by having different shaped glue storage grooves cooperate with each other, the various positions of the permanent magnet are effectively fixed within the permanent magnet section 21.

[0064] In this embodiment, the distance between two adjacent second magnetic isolation grooves 22, the distance between the groove edge of the second magnetic isolation groove 22 facing the first magnetic isolation groove 31 and the first magnetic isolation groove 31, and the size of the magnetic isolation bridge 221 formed by the second magnetic isolation groove 22 and the third magnetic isolation groove 32 are all W1, and the value of W1 is 0.4 < W1 ≤ 0.5 mm.

[0065] Specifically, two adjacent second magnetic isolation slots 22 are spaced apart to form a magnetic isolation bridge. Similarly, the slot edge of the second magnetic isolation slot 22 facing the first magnetic isolation slot 31 is spaced apart from the first magnetic isolation slot 31, and the slot edge of the second magnetic isolation slot 22 facing the third magnetic isolation slot 32 forms a magnetic isolation bridge with the third magnetic isolation slot 32. That is, three kinds of magnetic isolation bridges are formed. The spacing of the three kinds of magnetic isolation bridges is W1, only the placement position is different. By setting multiple magnetic isolation bridges and cooperating with each other, the rotor rotation stress can be satisfied while the leakage magnetic coefficient of the motor can be greatly reduced.

[0066] In this embodiment, the motor further includes P first weight-reducing holes 4, second weight-reducing holes 5, and third weight-reducing holes 6. The first weight-reducing hole 4 is an oblong hole with a first outer diameter of D2 and a second outer diameter of D3. The two ends of the first weight-reducing hole 4 are semi-circular structures with a radius of D4. The second weight-reducing hole 5 is located between two adjacent first weight-reducing holes 4. The circumference of the center of the second weight-reducing hole 5 is (D2+D3) / 2mm, and the diameter of the second weight-reducing hole 5 is D5. The third weight-reducing hole 6 is located in the same radial direction as the second weight-reducing hole 5. The circumference of the third weight-reducing hole 6 is 9*(D2+D3) / 20mm, and the diameter of the third weight-reducing hole 6 is D6. Wherein, D2=9*D1 / 13mm, D3=7*D1 / 13mm, D4=D2-D3mm, D5=D4-1mm, and D6=D4+1mm.

[0067] Specifically, P weight-reducing holes 4, 5, and 6 are arranged around the axis of the lamination body 1. The first weight-reducing hole 4 is an oblong hole with an outer diameter of D2 on the first side and D3 on the second side. That is, the circumference diameters of the first and second sides of the oblong hole are D2 and D3, respectively. The two ends of the oblong hole are semicircular structures with a diameter of D4. D4 = D2 - D3 mm, D2 = 9 * D1 / 13 mm, and D3 = 7 * D1 / 13 mm. The actual size of the oblong hole can be obtained algebraically.

[0068] In addition to the first weight-reducing hole 4, the lamination body 1 in this embodiment is also provided with a second weight-reducing hole 5 and a third weight-reducing hole 6. The second weight-reducing hole 5 is located between two adjacent first weight-reducing holes 4. The circumference of the center of the second weight-reducing hole 5 is (D2+D3) / 2mm, and the diameter of the second weight-reducing hole 5 is D5, where D5 = D4-1mm. The line connecting the center of the third weight-reducing hole 6, the center of the second weight-reducing hole 5, and the axis of the lamination body 1 is on the same straight line, that is, the third weight-reducing hole 6 and the second weight-reducing hole 5 are located in the same radial direction. The circumference of the third weight-reducing hole 6 is 9*(D2+D3) / 20mm, and the diameter of the third weight-reducing hole 6 is D6, where D6 = D4+1mm. By using multiple weight-reducing holes in combination, the rotational inertia of the motor rotor can be reduced, and the mass of the motor rotor can be made uniform, so that the center of mass is located at the center of the rotor shaft, reducing the motor imbalance and thus reducing the possibility of motor rotor eccentricity, thereby increasing the reliability of motor operation. On the other hand, the combination of various weight-reducing holes also reduces the weight of the motor and the cost of raw materials. The rotational inertia and initial dynamic balance of the motor using this rotor are improved, thereby significantly improving the motor's starting capability and operational stability.

[0069] This embodiment also provides a smart appliance, which includes the aforementioned motor. Compared to traditional motors, the use of multiple magnetically shielding slots reduces the harmonics of each order of the linear back electromotive force generated by the motor rotor, achieving a THDu (Total Harmonic Distortion) ≤ 2.3%. This improves the sinusoidal nature of the motor's back electromotive force, increases the utilization rate of permanent magnets, and reduces torque ripple in the motor output. Simultaneously, the use of multiple magnetically shielding slots reduces the leakage flux coefficient of the motor rotor, increases the main air gap flux amplitude, and improves the motor's efficiency and power density.

[0070] Furthermore, the smart appliance containing the motor can be used to absorb cooking fumes. For example, the smart appliance can be controlled by a voice module, which is equipped with a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the motor to start the smart appliance, thereby achieving intelligent regulation and improving motor efficiency, thus obtaining a better cooking fume absorption effect and improving the user experience.

[0071] It should be noted that the voice module, controller, voice receiving module, voice parsing module, and voice operation logic mentioned in this embodiment are all existing modules and logic in the prior art. This embodiment has not improved them, and will not elaborate further here.

[0072] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. An electric motor, characterized in that, The motor includes: A lamination body, the lamination body having an inner edge and an outer edge; The permanent magnet slots are P in number, and the P permanent magnet slots are arranged in a ring around the lamination body and close to the outer edge. Each permanent magnet slot includes a permanent magnet segment and a second magnetic isolation slot, and the second magnetic isolation slot is located at both ends of the permanent magnet segment. The first magnetic isolation groove is disposed on the outer edge. The first magnetic isolation groove is recessed from the outer edge toward the axis of the stamping body. The recessed direction of the first magnetic isolation groove corresponds to the position of the two adjacent second magnetic isolation grooves. The number of the first magnetic isolation grooves is P, and the number of the second magnetic isolation grooves is 2P. The motor also includes a third magnetic isolation groove, which is located on the lamination body and is opposite to the first magnetic isolation groove. The second magnetic isolation groove is located between the first magnetic isolation groove and the third magnetic isolation groove. The third magnetic isolation groove has a pentagonal structure, and two adjacent second magnetic isolation grooves and the third magnetic isolation groove are spaced apart to form a magnetic isolation bridge.

2. The motor as described in claim 1, characterized in that, A centerline exists between two adjacent second magnetic isolation slots. The two adjacent second magnetic isolation slots are symmetrically arranged about the centerline. The central angle between the two adjacent centerlines is α, where α ranges from 360 / 2π°. The diameter of the circumference of the second end of the first magnetic isolation slot is D1 mm. The diameter of the circumference of the first end of the first magnetic isolation slot is D1-1 mm. The central angle of the first end of the first magnetic isolation slot is γ. The central angle of the second end of the first magnetic isolation slot is β, where D1 is the diameter of the outer edge. The value of γ ranges from α / 18 ≤ γ ≤ 41α / 180°, and the value of β ranges from α / 10 ≤ β ≤ 2α / 9°.

3. The motor as described in claim 2, characterized in that, The central angle between two adjacent second magnetic isolation slots is δ, and the central angle of the third magnetic isolation slot is ε, wherein the value of δ is in the range of β<δ≤β+1.69°, and the value of ε is in the range of 2α / 9°.

4. The motor as described in claim 3, characterized in that, The central angle of the third magnetic isolation groove is ζ, and the value of ζ is in the range of α / 6°. The diameter of the circumference of the groove edge of the third magnetic isolation groove facing the axis of the lamination body is ≥55mm.

5. The motor as described in claim 1, characterized in that, The permanent magnet segment has a first glue storage tank and a second glue storage tank. The first glue storage tank is located in the middle region of the permanent magnet segment, and the second glue storage tank is disposed on both sides of the first glue storage tank and located in the edge region of the permanent magnet segment. The first glue storage tank is an isosceles trapezoidal tank, and the second glue storage tank is a semi-circular tank.

6. The motor as described in claim 1, characterized in that, The dimensions of the magnetic bridge formed by the second magnetic isolation groove and the first magnetic isolation groove are all W1, and the value of W1 is 0.4 < W1 ≤ 0.5 mm.

7. The motor as described in claim 1, characterized in that, The motor further includes P first weight-reducing holes, second weight-reducing holes, and third weight-reducing holes. The first weight-reducing hole is an oblong hole with a first outer diameter of D2 and a second outer diameter of D3. Both ends of the first weight-reducing hole are semi-circular structures with a radius of D4. The second weight-reducing hole is located between two adjacent first weight-reducing holes. The circumference of the center of the second weight-reducing hole is (D2+D3) / 2mm, and the diameter of the second weight-reducing hole is D5. The third weight-reducing hole is located in the same radial direction as the second weight-reducing hole. The circumference of the third weight-reducing hole is 9*(D2+D3) / 20mm, and the diameter of the third weight-reducing hole is D6. Wherein, D2=9*D1 / 13mm, D3=7*D1 / 13mm, D4=D2-D3mm, D5=D4-1mm, and D6=D4+1mm.

8. A smart appliance, characterized in that, The smart appliance includes a motor as described in any one of claims 1-7.

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