CN210985769U

CN210985769U - Low-noise high-efficiency brushless motor for cigarette machine and cigarette machine with same

Info

Publication number: CN210985769U
Application number: CN202020026351.0U
Authority: CN
Inventors: 钱志存; 唐小元; 高桂林; 田军; 储俊杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-01-07
Filing date: 2020-01-07
Publication date: 2020-07-10
Anticipated expiration: 2030-01-07

Abstract

The application discloses a low-noise high-efficiency brushless motor for a cigarette machine and the cigarette machine with the motor, the low-noise high-efficiency brushless motor for the cigarette machine is provided with a motor shell, a stator and a rotor, the stator is fixedly arranged in the motor shell, and the rotor is arranged in a motor shell and can be rotatably arranged around the outer side of the stator, compared with the existing motor, the motor has high torque and overload capacity, hard load characteristic and small copper loss of the motor, the output efficiency of the cigarette machine can be improved, in addition, the motor of the application forms an auxiliary groove in the middle position of a tooth crown of each tooth part in an inwards concave mode, the auxiliary groove can effectively reduce the magnetic groove torque when the auxiliary groove is used for reducing the rotation matching of the rotor and the stator and the harmonic component of the back electromotive force of the stator, the noise generated by the vibration of the motor can be greatly reduced, and the use experience of a user, enhancing the competitiveness of the product in the market.

Description

Low-noise high-efficiency brushless motor for cigarette machine and cigarette machine with same

Technical Field

The utility model belongs to the technical field of domestic appliance, especially, relate to a cigarette machine is with high-efficient brushless motor of low noise and have cigarette machine of this motor.

Background

The range hood is mainly installed on the upper portion of a stove, a power supply of the range hood is connected, a driving motor drives a wind wheel to rotate at a high speed, a negative pressure region is formed in a certain space range above the stove, indoor oil fume is sucked into the range hood, the oil fume is filtered through an oil screen to be subjected to first oil fume separation and then enters an air channel of the range hood, the oil fume is subjected to second oil fume separation through rotation of an impeller, oil fume in an air cabinet is acted by centrifugal force, oil mist is condensed into oil drops, oil cups are collected through oil paths, and purified smoke is finally discharged along a fixed passage. However, the existing motor installed on the range hood generally adopts an asynchronous motor, the power factor of the asynchronous motor is lagged, the light-load power factor is low, so that the efficiency of the range hood is low when the range hood operates, a large amount of noise is generated when the existing motor installed on the range hood operates, the user experience is reduced, and the competitiveness of the product on the market is reduced.

SUMMERY OF THE UTILITY MODEL

Objects of the invention

In order to overcome the above insufficiency, the utility model aims to provide a cigarette machine is with high-efficient brushless motor of low noise and have cigarette machine of this motor to solve the motor running efficiency on the current cigarette machine and hang down, produce the technical problem of a large amount of noises during the operation.

(II) technical scheme

In order to achieve the purpose, the technical scheme provided by the application is as follows:

This application provides a high-efficient brushless motor of low noise for cigarette machine on the one hand, and it includes:

The motor comprises a motor shell, a stator and a rotor, wherein the stator is fixedly arranged in the motor shell, and the rotor is arranged in the motor shell and can rotate around the outer side of the stator;

The stator includes: the iron core comprises a stator yoke part and a plurality of tooth parts which surround the stator yoke part and are formed in a protruding mode along the radial direction of the stator yoke part, each winding is wound on one tooth part, the middle position of a tooth crown of each tooth part is inwards sunken to form an auxiliary groove, and the auxiliary grooves are used for reducing magnetic groove torque when the rotor and the stator are matched in a rotating mode and reducing harmonic components of back electromotive force of the stator;

The rotor includes: the fixing piece which is of a cup-shaped structure and is rotatably arranged around the outer side of the iron core is circumferentially arranged, the plurality of permanent magnets and one end of the permanent magnets are arranged on the inner side wall of the fixing piece, the center of the fixing piece is connected with the center of the fixing piece, the other end of the fixing piece penetrates through the iron core and outwards extends out of the rotating shaft of the motor shell, and one end of the rotating shaft, which penetrates out of.

Further, the number of teeth of the iron core is 12, and the number of poles of the permanent magnet is 10.

Further, the number of teeth of the iron core is 12, and the number of poles of the permanent magnet is 14.

furthermore, the auxiliary groove is of a semicircular structure, the diameter length of the auxiliary groove accords with a formula of 0.5L 1 to 2R to L1, wherein R is the radius of the auxiliary groove, and L1 is the interval between two adjacent tooth crowns.

furthermore, the auxiliary groove is of a semicircular structure, the diameter length of the auxiliary groove is equal to or more than 0.5L 1 and equal to or less than 2R and equal to or less than L2, wherein R is the radius of the auxiliary groove, and L2 is the interval between two adjacent permanent magnets.

Furthermore, two ends of each crown are inclined from the outer surface of the crown to the directions of two end surfaces of the crown by taking the central line of the crown as a symmetry axis to form two auxiliary surfaces, the auxiliary surfaces are straight inclined surfaces or arc-shaped inclined surfaces, and the auxiliary surfaces are used for reducing the magnetic slot torque when the rotor and the stator are in rotating fit and reducing the harmonic component of the counter electromotive force of the stator.

furthermore, the length of a first extension line H1 of the crown, the length of a second extension line L3 of the crown and the length of the auxiliary surface L4 conform to the following formula 2L 4, H1, L4 and L3 of the formula 2H1, L3 and L5H 1, wherein the first extension line H1 is an extension line from the end surface of the crown to the outer surface of the crown, and the second extension line L3 is an extension line from the outer surface of the crown to the end surface.

Further, still include the bearing frame subassembly, the bearing frame subassembly is inside motor housing and correspond the setting with the axis of rotation for support iron core and supply the axis of rotation to pass and with axis of rotation normal running fit.

Furthermore, one end of the rotating shaft extending out of the motor shell is provided with a bolt, a slot matched with the bolt in shape is formed in the impeller of the range hood, and the rotating shaft is fixed with the slot into a whole through the bolt.

This application on the other hand provides a cigarette machine with high-efficient brushless motor of low noise for cigarette machine, and the cigarette machine still includes: cigarette machine shell, impeller and power supply subassembly, the inside wind channel that forms of cigarette machine shell, the motor setting is connected in the wind channel and with the impeller, and the power supply subassembly is connected with the motor electricity and is used for supplying power for the motor.

Borrow by above technical scheme, the beneficial effect of this application lies in: the high-efficient brushless motor of low noise is through setting up motor housing for the cigarette machine, stator and rotor, the stator is fixed to be set up in motor housing, the rotor is connected around the rotatable setting in the stator outside and with the cigarette machine impeller, compare in current motor, the motor torque of this application is high and the overload capacity is strong, load characteristic is hard, the copper loss volume of motor is little, can improve the output efficiency of cigarette machine, and, the motor of this application is at inside sunken supplementary groove of forming of the intermediate position of the tooth crown of every tooth portion, the supplementary groove can effectively reduce the supplementary groove and be used for reducing the magnetic slot torque when rotor and stator rotate the cooperation and be used for reducing the harmonic component of the back electromotive force of stator, the noise that can greatly reduced motor vibrations produced, improve user's use and experience, strengthen the competitiveness of product on market.

Drawings

FIG. 1 is a perspective view of a low noise, high efficiency brushless motor for a range hood of the present invention;

FIG. 2 is an exploded view of the low noise high efficiency brushless motor for a range hood of the present invention;

FIG. 3 is a schematic structural diagram of the iron core of the low-noise high-efficiency brushless motor for the range hood of the present invention;

FIG. 4 is a schematic structural diagram of another embodiment of the iron core of the low-noise high-efficiency brushless motor for the range hood of the present invention;

Figure 5 is a schematic view of the cogging torque of group a of the low-noise high-efficiency brushless motor for a range hood of the present invention;

Figure 6 is a schematic view of the cogging torque of group B of the low-noise high-efficiency brushless motor for a range hood of the present invention;

Figure 7 is a schematic view of the cogging torque of group C of the low-noise high-efficiency brushless motor for a range hood of the present invention;

Figure 8 is a schematic view of the cogging torque of group D of the low-noise high-efficiency brushless motor for a range hood of the present invention;

Figure 9 is a schematic diagram of the back emf of group a of the low noise high efficiency brushless motor for a range hood of the present invention;

Figure 10 is a graph of the fourier transform of the back emf of group a of the low noise high efficiency brushless motor for a range hood of the present invention;

Figure 11 is a schematic diagram of the back emf of group B of the low noise high efficiency brushless motor for a range hood of the present invention;

Figure 12 is a graph of the fourier transform of the back emf of group B of the low noise high efficiency brushless motor for a range hood of the present invention;

Figure 13 is a schematic diagram of the back emf of group C of the low noise high efficiency brushless motor for a range hood of the present invention;

Figure 14 is a graph of the back emf of group C of the low noise high efficiency brushless motor for a range hood of the present invention as a fourier transform;

Figure 15 is a schematic diagram of the back emf of group D of the low noise high efficiency brushless motor for a range hood of the present invention;

Fig. 16 is a graph of fourier transform of the back electromotive force of group D of the low-noise high-efficiency brushless motor for the range hood of the present invention;

Fig. 17 is a schematic structural view of a tooth portion of a low-noise high-efficiency brushless motor for a range hood according to the present invention.

Reference numerals:

1: a motor housing; 2: a fixing member; 3: a rotating shaft; 4: an iron core; 401: a stator yoke; 402: a tooth portion; 4021: an auxiliary groove; 4022: an auxiliary surface; 5: a bearing housing assembly; 6: a bolt; 7: and a permanent magnet.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

Referring to fig. 1-3, the present invention provides a low-noise high-efficiency brushless motor for a range hood, which comprises: the motor comprises a motor shell 1, a stator and a rotor, wherein the stator is fixedly arranged in the motor shell 1, and the rotor is arranged in a motor shell and can rotate around the outer side of the stator;

The stator includes: a core 4 and a plurality of windings, the core 4 includes a stator yoke 401 and a plurality of teeth 402 formed around the stator yoke 401 and protruding outward in the radial direction of the stator yoke 401, each winding is wound on one tooth 402, wherein the middle position of one end of each tooth 402 close to the rotor is recessed inwards to form an auxiliary slot 4021 for reducing the magnetic slot torque when the rotor and the stator are in rotating fit;

The rotor includes: the fixing piece 2 which is of a cup-shaped structure and is rotatably arranged around the outer side of the iron core 4, the plurality of permanent magnets 7 which are circumferentially arranged on the inner side wall of the fixing piece 2 and one end of each permanent magnet are connected with the center of the fixing piece 2, the other end of each permanent magnet penetrates through the iron core 4 and outwards extends out of the rotating shaft 3 of the motor shell 1, and one end of each rotating shaft 3, which penetrates out of the motor shell 1, is connected with an.

The brushless motor of this application is installed on the cigarette machine mainly, the motor is installed on the cigarette machine back axis of rotation 3 and is connected with the impeller of cigarette machine, can drive the impeller rotation when the cigarette machine starts, because the brushless motor of this application is the external rotor structure, starting torque is high and overload capacity is strong, load characteristic is hard, the copper loss of motor is little, the rotation efficiency of motor is compared in asynchronous machine's rotation efficiency can be higher, and, the brushless motor of this application has set up supplementary groove 4021 in the position of tooth crown, supplementary groove 4021 can reduce the harmonic component of the counter electromotive force of stator and has reduced the tooth's socket torque between stator and the rotor when stator and rotor normal running fit, vibrations when having reduced the motor rotation, thereby the working noise of motor has been reduced. The motor has the advantages of simple structure, small size, high efficiency, high power factor, small rotating inertia, strong overload capacity and reliable operation, and compared with an asynchronous motor with the same power, the whole weight of the motor can be reduced by 40-60 percent.

Specifically, this application has set up bearing frame subassembly 5 in motor housing 1 inside, and bearing frame subassembly 5 corresponds the setting with axis of rotation 3, during the equipment brushless motor, overlaps 4 covers of iron core and establishes in the 5 outsides of bearing frame subassembly, wears to establish axis of rotation 3 on the bearing frame, and the one end and the mounting 2 of axis of rotation 3 are connected, and the other end stretches out motor housing 1 and is connected with the impeller. When the motor is electrified, the motor winding and the permanent magnet 7 generate electromagnetic induction to generate magnetic field force, and the fixing piece 2 and the rotating shaft 3 are driven to synchronously rotate, so that the impeller fixed on the rotating shaft 3 is driven to rotate.

Specifically, the one end that brushless motor's axis of rotation 3 stretches out motor casing is provided with bolt 6, offers on the cigarette machine impeller with 6 shape of bolt slot of mutually supporting, and axis of rotation 3 inserts the slot and the fixed an organic whole of impeller through bolt 6. Brushless motor's 6 shapes of bolt are unanimous with the slot of the impeller on the current market to, the fixed orifices of seting up on the motor housing 1 of this application matches with the mounting hole of current cigarette machine, like this, when installing the motor of this application on the cigarette machine, the motor directly change to current cigarette machine on can, need not to punch in addition, the impeller that can be directly with the cigarette machine of motor is connected, need not to set up mounting structure in addition on the impeller, improves the convenience of installation.

Referring to fig. 4 and 17, specifically, in order to improve the output efficiency of the motor to the maximum extent, the present application optimizes the pole slot coordination of the motor for the cigarette machines with different rotation speeds, specifically as follows:

When the impeller rotating speed of the cigarette making machine is 1500rpm or above, the number of the tooth parts 402 of the iron core 4 is set to 12, the number of the poles of the permanent magnet 7 is set to 10, a pole-slot matching mode of 10 poles and 12 slots is formed, specifically, one stator slot is formed between two adjacent tooth parts 402, and 12 stator slots can be formed by 12 tooth parts 402.

When the impeller rotation speed is below 1500rpm, the number of teeth 402 of the iron core 4 is set to 12, the number of poles of the permanent magnet 7 is set to 14, and a pole-slot matching mode of 14 poles and 12 slots is formed.

The cooperation of the polar grooves of the stator groove of the motor is optimized according to the cigarette machines with different rotating speeds, so that the iron loss and the copper loss of the motor are effectively reduced, and the rotating efficiency of the motor is improved.

the auxiliary groove 4021 is optimized, the auxiliary groove 4021 is arranged in a semicircular structure, and in an optional embodiment, the diameter of the auxiliary groove 4021 is set to be 0.5L 1 or more and 2R or less and L1 or less, specifically, R is the radius of the auxiliary groove 4021, and L1 is the interval between two adjacent tooth crowns.

in another alternative embodiment, the diameter length of the auxiliary slots 4021 is set to 0.5L 1 ≦ 2R ≦ L2, specifically, R is the radius of the auxiliary slots 4021 and L2 is the spacing between two adjacent permanent magnets 7.

The two embodiments optimize the diameter and the length of the auxiliary slot 4021, reduce the harmonic component of the back electromotive force of the stator and the cogging torque between the stator and the rotor to the maximum extent, improve the output efficiency of the motor, make the motor rotate more smoothly, and avoid the occurrence of vibration in the rotation process of the motor to generate a large amount of noise.

Referring to fig. 4, in another optional embodiment, in the present application, in addition to the auxiliary groove 4021 being formed in the middle of the tooth crown of the stator, two auxiliary surfaces 4022 are formed by chamfering two ends of the tooth crown, specifically, the auxiliary surfaces 4022 are formed by inclining from the outer surface of the tooth crown to the directions of the two end surfaces of the tooth crown with the center line of the tooth crown as the symmetry axis, the auxiliary surfaces 4022 may be straight inclined surfaces or arc inclined surfaces, the auxiliary surfaces 4022 can reduce the harmonic component of the back electromotive force of the stator, reduce the cogging torque of the motor, improve the output efficiency of the motor, make the motor rotate more smoothly, and avoid the generation of a large amount of noise due to vibration in the rotation process of the motor.

referring to fig. 17, preferably, the present application optimizes the shape of the tooth crown, specifically, the length of the first extension line H1, the length of the second extension line L3, and the length of the auxiliary plane L4 of the tooth crown conform to the formula 2L 4 ≥ H1 ≥ 0.5L 4 and the formula 2H1 ≤ L3 ≤ 3.5H1, where the first extension line H1 is an extension line from the end face of the tooth crown to the outer surface of the tooth crown, and the second extension line L3 is an extension line from the outer surface of the tooth crown to the end face.

To verify the low noise performance of the motor of the present application, the following tests were made and are reported in the following table:

Group of	Optimization scheme	Cogging torque(mN.mpk)	BEMF Vpk(1000rpm)
				A	Original design	4.48	32.5
B	Tooth crown slotting of 2.5mm	0.92	32.0
				C	Tooth crown slotting 2mm	0.98	32.2
D	Grooving and auxiliary surfaces	1.28	32.3

In the above table, since group a is a conventional design, that is, the auxiliary groove 4021 and the auxiliary surface 4022 are not provided, the cogging torque of group a is 4.48mN, the back electromotive force of the motor is 32.5Vpk, group B is the auxiliary groove 4021 and the radius of the auxiliary groove 4021 is 2.5mm, the cogging torque of group B is 0.92mN, the back electromotive force of the motor is 32.0Vpk, group C is the auxiliary groove 4021 and the radius of the auxiliary groove 4021 is 2mm, the torque of group C is 0.98mN, the back electromotive force of the motor is 32.2Vpk, group D is the auxiliary groove 4021 and the auxiliary surface 4022, the cogging torque of group D is 1.28mN, the back electromotive force of the motor is 32.3Vpk, it is known from the above table that the output efficiency of the motor in which the auxiliary groove 4021 and the auxiliary surface 4022 are provided is greatly reduced as compared to the original design, and the output efficiency of the motor is greatly improved, the vibration is greatly reduced, and the noise reduction effect is obvious. Fig. 5 to 8 are schematic diagrams of cogging torques of group a, group B, group C, and group D, fig. 9, 11, 13, and 15 are schematic diagrams of back electromotive forces of group a, group B, group C, and group D, and fig. 10, 12, 14, and 16 are schematic diagrams of fourier transforms of back electromotive forces of group a, group B, group C, and group D.

This application has still improved a cigarette machine that has above-mentioned high-efficient brushless motor of low noise for cigarette machine, and the cigarette machine still includes: cigarette machine shell, impeller and power supply subassembly, the inside wind channel that forms of cigarette machine shell, the motor setting is connected in the wind channel and with the impeller, and the power supply subassembly is connected with the motor electricity and is used for supplying power for the motor.

The utility model provides a cigarette machine is through setting up the high-efficient brushless motor of low noise for the cigarette machine, the work efficiency of cigarette machine is high, power factor is high, the pivoted inertia volume is little, the overload capacity is strong, the operation is reliable, the output efficiency of cigarette machine compares and can improve 50% to 80% in current cigarette machine. Moreover, the cigarette machine of the application shakes for a short time in the working process, the generated noise is small, the use experience of users is promoted, and the market competitiveness of products is enhanced.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims

1. The utility model provides a high-efficient brushless motor of low noise for cigarette machine which characterized in that includes: the motor comprises a motor shell, a stator and a rotor, wherein the stator is fixedly arranged in the motor shell, and the rotor is arranged in the motor shell and can rotate around the outer side of the stator;

The stator includes: the iron core comprises a stator yoke part and a plurality of tooth parts which surround the stator yoke part and are formed in a protruding mode along the radial direction of the stator yoke part, each winding is wound on one tooth part, the middle position of a tooth crown of each tooth part is sunken inwards to form an auxiliary groove, and the auxiliary groove is used for reducing magnetic groove torque when the rotor and the stator are matched in a rotating mode and reducing harmonic components of back electromotive force of the stator;

The rotor includes: the iron core is arranged on the inner side wall of the fixing piece in a rotatable mode, the fixing piece is of a cup-shaped structure, the fixing piece is circumferentially arranged on the inner side wall of the fixing piece, one end of the fixing piece is connected with the center of the fixing piece, the other end of the fixing piece penetrates through the iron core to outwards extend out of the rotating shaft of the motor shell, and one end of the rotating shaft penetrates out of the motor shell and is connected with an impeller of an external smoke machine.

2. The low-noise high-efficiency brushless motor for the cigarette making machine according to claim 1, wherein the number of the teeth of the iron core is 12, and the number of the poles of the permanent magnet is 10.

3. The low-noise high-efficiency brushless motor for the cigarette making machine according to claim 1, wherein the number of the teeth of the iron core is 12, and the number of the poles of the permanent magnet is 14.

4. the low-noise high-efficiency brushless motor for the cigarette machine according to claim 2 or 3, wherein the auxiliary groove has a semicircular structure, and the diameter length of the auxiliary groove conforms to the formula 0.5L 1 ≦ 2R ≦ L1, wherein R is the radius of the auxiliary groove, and L1 is the interval between two adjacent tooth crowns.

5. the low-noise high-efficiency brushless motor for the cigarette machine according to claim 2 or 3, wherein the auxiliary slot has a semicircular structure, and the diameter length of the auxiliary slot is in accordance with 0.5L 1 ≦ 2R ≦ L2, wherein R is the radius of the auxiliary slot, and L2 is the interval between two adjacent permanent magnets.

6. The low-noise high-efficiency brushless motor for a cigarette machine according to claim 5, wherein both ends of each crown are inclined from the outer surface of the crown toward the direction of both end surfaces of the crown with the center line of the crown as a symmetry axis to form two auxiliary surfaces which are straight inclined surfaces or arc inclined surfaces for reducing the magnetic slot torque when the rotor and the stator are rotationally fitted and for reducing the harmonic component of the counter electromotive force of the stator.

7. the low-noise high-efficiency brushless motor for the cigarette machine according to claim 6, wherein the length of a first extension line H1 of the crown and the length of a second extension line L3 and the length of the auxiliary surface L4 conform to the equations 2L 4 ≥ H1 ≥ 0.5L 4 and 2H1 ≤ L3 ≤ 3.5H1, wherein the first extension line H1 is from the crown end surface to the crown outer surface extension line, and the second extension line L3 is from the crown outer surface to the end surface extension line.

8. The low-noise high-efficiency brushless motor for the cigarette making machine according to claim 7, further comprising a bearing housing assembly disposed inside the motor housing and corresponding to the rotation shaft for supporting the iron core and for the rotation shaft to pass through and rotatably fit with the rotation shaft.

9. The low-noise high-efficiency brushless motor for the cigarette making machine as claimed in claim 8, wherein a plug pin is arranged at one end of the rotating shaft extending out of the motor casing, a slot matching with the plug pin in shape is formed in the impeller of the cigarette making machine, and the rotating shaft is fixed with the slot into a whole through the plug pin.

10. A machine having a low noise, high efficiency brushless motor for a machine as claimed in any one of the preceding claims 1 to 9, said machine further comprising: the cigarette machine comprises a cigarette machine shell, an impeller and a power supply assembly, wherein an air channel is formed inside the cigarette machine shell, the motor is arranged in the air channel and connected with the impeller, and the power supply assembly is electrically connected with the motor and used for supplying power to the motor.