Ultrathin, high-power-density, efficient, energy-saving and low-noise fan motor

Abstract

The utility model discloses an ultrathin high-power-density, efficient, energy-saving and low-noise fan motor, which is characterized in that a plurality of barrier strips are arranged on the inner side surface of a motor shell, magnets are arranged between adjacent barrier strips, and the height of the magnets is higher than that of the barrier strips, so that the adjacent magnets with different polarities can be separated by the barrier strips; the magnetic short circuit phenomenon is avoided, the motor shaking phenomenon can be reduced, the noise generated during the operation of the motor can be reduced, in addition, the circle formed by the outer side surfaces of the stator teeth and the center of the iron core are eccentrically arranged, the cogging torque generated during the operation of the motor can be reduced, the motor shaking phenomenon is reduced, and the service life of the motor is prolonged. And the noise generated during the operation of the motor is further reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of fan motors, and in particular relates to an ultra-thin high power density and high efficiency energy-saving low noise fan motor. Background Art

[0002] As people's living standards improve, the requirements for fans also increase. For example, fans are required to be quiet enough when running to avoid generating a lot of noise that affects sleep. However, current fan motors generate a lot of electromagnetic harmonics and have a large cogging torque during operation, which causes severe jitter during motor operation. The motor jitter process generates a lot of noise, affecting the user experience. Utility Model Content

[0003] (I) Purpose of the utility model

[0004] In order to overcome the above shortcomings, the purpose of the utility model is to provide an ultra-thin, high-power density, high-efficiency, energy-saving and low-noise fan motor to solve the technical problems that the existing fan motor generates a large number of electromagnetic harmonics and a large cogging torque during operation, resulting in severe jitter during motor operation and a large noise during the jitter process.

[0005] (II) Technical solution

[0006] To achieve the above objectives, the technical solutions provided by this application are as follows:

[0007] An ultra-thin high power density and high efficiency energy-saving low noise fan motor, comprising: a motor housing, a plurality of raised barrier strips spaced circumferentially on the inner side thereof, a magnet disposed between two adjacent barrier strips, each magnet having a height greater than the barrier strip, a circular iron core disposed inside the motor housing and opposite to the magnet, the iron core comprising a plurality of stator teeth having an arc-shaped outer side, wherein a circle formed by the outer side of the stator teeth is eccentrically disposed with respect to the center of the iron core, and further comprising: a stator central axis penetrating the motor housing and rotatably connected between the iron core and the motor housing;

[0008] The present application arranges multiple barrier strips on the inner side of the motor housing, arranges magnets between adjacent barrier strips, and ensures that the height of the magnets is greater than the barrier strips. In this way, the barrier strips can separate adjacent magnets of different polarities to avoid magnetic short circuits, optimize the magnetic circuit, reduce electromagnetic harmonics, reduce motor jitter, and help reduce the noise generated when the motor is running. In addition, by eccentrically arranging the circle formed by the outer side of the stator teeth and the center of the iron core, the tooth slot torque generated when the motor is running can be reduced, the motor jitter can be reduced, and the noise generated when the motor is running can be further reduced.

[0009] In some embodiments, the motor further comprises: two bearings disposed at both ends of the motor housing for the central axis of the stator to pass through, wherein a mounting groove for the bearing to be embedded is provided at the position of the iron core corresponding to the bearing;

[0010] By providing the mounting groove, the bearing can be partially or completely embedded in the mounting groove when installing the bearing, thereby reducing the installation height of the electrical components inside the motor. The motor housing can be set flat, which can save materials and run more smoothly.

[0011] In some embodiments, the motor housing includes: a rotor housing and an end cover, wherein a boss stop is provided near the edge of the end cover and the lower end of the rotor housing first extends downward to abut against the side of the boss stop and then extends horizontally to be detachably connected to the edge of the end cover;

[0012] By setting a boss stop on the edge of the end cover, the lower end of the rotor casing abuts against the boss stop. On the one hand, the boss stop can block foreign matter and prevent iron filings generated when the end cover and the rotor casing are screwed into the inner cavity formed by the rotor casing and the end cover, causing the bearing and the stator center axis to get stuck and generate noise. On the other hand, the connection and abutment between the rotor casing and the end cover can ensure the concentricity of the rotor casing and the center point of the end cover, which is conducive to precise installation.

[0013] In some embodiments, a through hole is provided on the rotor housing for the stator center axis to pass through, and the gap between the edge of the through hole and the stator center axis is 1-2 mm;

[0014] By reducing the gap between the hole of the rotor casing and the central axis of the stator, foreign matter can be prevented from entering the inner cavity formed by the rotor casing and the end cover, causing the bearing and the central axis of the stator to get stuck and generate noise.

[0015] In some embodiments, the magnet is an overall rectangular structure;

[0016] By optimizing the shape of the magnet, it is helpful to optimize magnetic short, reduce electromagnetic harmonics, reduce motor jitter, reduce noise, and increase output torque.

[0017] In some embodiments, the magnet is an arc-shaped structure close to the inner side of the motor housing, and is a flat structure away from the inner side of the motor housing;

[0018] By optimizing the shape of the magnet into a bread shape, it is helpful to optimize magnetic short, reduce electromagnetic harmonics, reduce motor jitter, reduce noise, and increase output torque.

[0019] In some embodiments, the number of magnets is 22 poles, and the plurality of stator teeth form 18 slots;

[0020] By adjusting the pole-slot matching of the motor, the output torque of the motor can be increased and the efficiency can be higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the ultra-thin high power density and high efficiency energy saving low noise fan motor of the utility model;

[0022] Figure 2 It is an exploded diagram of the ultra-thin high power density and high efficiency energy saving low noise fan motor of the utility model;

[0023] Figure 3 It is a cross-sectional view of the ultra-thin high power density and high efficiency energy-saving low noise fan motor of the utility model;

[0024] Figure 4 This is a state diagram of the rotor housing in the ultra-thin high power density and high efficiency energy-saving low noise fan motor of the utility model when the magnet is not installed;

[0025] Figure 5 This is a state diagram of the rotor housing of the ultra-thin high power density and high efficiency energy-saving low noise fan motor of the utility model after the magnet is installed;

[0026] Figure 6 It is a schematic diagram of the structure of the iron core in the ultra-thin high power density and high efficiency energy saving low noise fan motor of the utility model;

[0027] Figure 7 It is a schematic diagram of the iron core of the ultra-thin high power density and high efficiency energy-saving low noise fan motor of the utility model, after the circle A and the circle B are marked;

[0028] Figure 8 It is the existing motor performance test curve diagram;

[0029] Fig. 9 This is a performance test curve diagram of the ultra-thin high power density and high efficiency energy saving low noise fan motor of the utility model;

[0030] Fig.10 It is a cogging torque scanning diagram of the ultra-thin high power density and high efficiency energy saving low noise fan motor of the utility model.

[0031] Reference numerals:

[0032] 1. Motor housing; 101. Rotor housing; 1011. Barrier strip; 102. End cover; 1021. Boss stop; 2. Magnet; 3. Iron core; 301. Stator teeth; 302. Mounting slot; 4. Stator center axis; 5. Screws; 6. Bearing. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the utility model.

[0034] The utility model provides an ultra-thin high power density and high efficiency energy saving low noise fan motor, comprising: a motor housing 1, an inner side surface of which is circumferentially spaced apart with a plurality of raised barrier strips 1011, a magnet 2 arranged between two adjacent barrier strips 1011, the height of the magnet 2 being greater than the barrier strip 1011, a circular iron core 3 arranged inside the motor housing 1 and opposite to the magnet 2, the iron core 3 comprising a plurality of stator teeth 301 having an arc-shaped outer side surface, wherein the circle formed by the outer side surface of the stator teeth 301 is eccentrically arranged with the center of the iron core 3, and also comprising: a stator central axis 4 passing through the motor housing 1 and rotatably connected to the iron core 3 and the motor housing 1.

[0035] See also Figure 7 In order to clearly indicate that the circle formed by the outer side surface of the stator tooth 301 is eccentrically arranged with respect to the center of the iron core 3, a circle A is drawn through the outer side surface of the stator tooth 301, and a circle B is drawn with the center of the iron core 3 as the center and with the radius from the center of the iron core 3 to the outermost point of the outer side surface of the stator tooth 301. It can be seen that the centers of the circles A and B are eccentrically arranged.

[0036] Specifically, the size of the arc formed by the outer side surface of the stator tooth 301, the radius of the iron core 3 and other parameters can be adjusted according to actual conditions, and it is only necessary to ensure that the centers of the formed circles A and B are eccentrically set.

[0037] Specifically, the height of the magnet 2 may be higher than 1 / 2 or 1 / 3 of the barrier strip 1011 .

[0038] Specifically, the barrier strip 1011 can separate adjacent magnets 2 of different polarities to avoid magnetic short circuit. The circle formed by the outer side of the stator tooth 301 and the center of the core 3 are eccentrically arranged to effectively reduce the sudden change of the air gap length, thereby reducing the sudden change of magnetic field energy storage, and further reducing the cogging torque.

[0039] Specifically, the motor housing 1 includes: a rotor housing 101 and an end cover 102. Preferably, the present application forms a boss stop 1021 protruding upward near the edge of the end cover 102. When the rotor housing 101 is connected to the end cover 102, the lower end of the rotor housing 101 first extends downward to abut against the side of the boss stop 1021, and then extends horizontally to be detachably connected to the edge of the end cover 102 through the screw 5. When the screw 5 is turned, iron filings may be generated. Under the obstruction of the boss stop 1021, it is difficult for the iron filings to enter the cavity surrounded by the rotor housing 101 and the end cover 102 from the gap between the rotor housing 101 and the end cover 102.

[0040] Specifically, through holes are respectively opened at the two ends inside the motor housing 1, namely, at the center of the rotor housing 101 and the end cover 102, and two bearings 6 are respectively arranged at the positions corresponding to the through holes. The stator center axis 4 passes through the rotor housing 101 and the end cover 102 and rotates with the bearings 6 respectively.

[0041] Preferably, the present application provides a mounting groove 302 on the core 3 at a position corresponding to the bearing 6 for the bearing 6 to be embedded and installed.

[0042] Preferably, the gap between the edge of the through hole and the stator center axis 4 is 1-2 mm. By reducing the gap between the hole of the rotor housing 101 and the stator center axis 4, foreign matter can be prevented from entering the inner cavity of the rotor housing 101 to cause the bearing 6 to get stuck and generate noise.

[0043] Preferably, in one embodiment, the magnet 2 is configured as a whole to be a rectangular structure.

[0044] Preferably, in another embodiment, the inner side surface of the magnet 2 close to the motor housing 1 is an arc-shaped structure, and the inner side surface away from the motor housing 1 is a flat structure, so that the magnet 2 as a whole forms a bread-shaped structure.

[0045] Specifically, two adjacent stator teeth 301 form a slot. Preferably, in the present application, the number of magnets 2 is 22 poles, and the plurality of stator teeth 301 is set to 18, and the plurality of stator teeth 301 form 18 slots. By adjusting the pole-slot matching of the motor, the output torque of the motor is made larger and the efficiency is higher.

[0046] For details, please refer to Figure 8 and Fig. 9 , Figure 8 This is the existing motor performance test curve. Fig. 9 It is a motor performance test curve diagram of the present application; Figure 8 and Fig. 9 The motor current (I), speed (n), efficiency (η) and power (p) are tested respectively, and the horizontal axis is the torque. Figure 8It can be seen that the load point output torque of existing motors on the market is in the range of 0.25-0.50Nm. Since the present application optimizes the pole slot matching and magnetic circuit of the motor, Fig. 9 It can be seen that the output torque of the motor of the present application is in the range of 0.35-0.8Nm, and the output torque is larger. Under the same load, the motor has a larger output torque and is more efficient. It has a high power density and can reach the same output torque of conventional motors on the market under low current conditions. There is no need to increase the current, which is more energy-efficient. In addition, the weight of the motor of the present application is about 40% lighter than that of similar motors on the market. The weight of the motor on the market is 1.2 kg, and the weight of the newly designed motor is less than 0.7 kg. It has a small size, is more suitable for the fan shape, and the appearance can be designed to be more beautiful.

[0047] See also Fig.10 In the present application, the circle formed by the outer side surface of the stator tooth 301 is eccentric to the center of the iron core 3, and the magnet 2 is arranged in a rectangular or bread shape, which can reduce the cogging torque generated when the motor is running. The cogging torque of similar motors on the market is 7.5mNm. As can be seen from the figure, the cogging torque of the motor of the present application is reduced to less than 2.0mNm.

[0048] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.

Claims

1. An ultra-thin high power density and high efficiency energy saving low noise fan motor, characterized in that: include: A motor housing (1) having a plurality of raised barrier strips (1011) spaced apart in the circumferential direction on its inner side surface, a magnet (2) arranged between two adjacent barrier strips (1011), the height of the magnet (2) being greater than the barrier strip (1011), a circular iron core (3) arranged inside the motor housing (1) and opposite to the magnet (2), the iron core (3) comprising a plurality of stator teeth (301) having an arc-shaped outer side surface, wherein a circle formed by the outer side surface of the stator teeth (301) is eccentrically arranged with respect to the center of the iron core (3), and further comprising: a stator central axis (4) passing through the motor housing (1) and rotatably connected to the iron core (3) and the motor housing (1).

2. The ultra-thin high power density and high efficiency energy saving low noise fan motor according to claim 1 is characterized in that: Also includes: Two bearings (6) are arranged at both ends of the motor housing (1) for the stator center axis (4) to pass through, wherein the iron core (3) is provided with a mounting groove (302) for the bearing (6) to be embedded at a position corresponding to the bearing (6).

3. The ultra-thin high power density and high efficiency energy saving low noise fan motor according to claim 2 is characterized in that: The motor housing (1) comprises: a rotor housing (101) and an end cover (102), wherein a boss stop (1021) is provided in an upwardly protruding ring near the edge of the end cover (102), and the lower end of the rotor housing (101) first extends downward to abut against the side of the boss stop (1021), and then extends horizontally to be detachably connected to the edge of the end cover (102).

4. The ultra-thin high power density and high efficiency energy saving low noise fan motor according to claim 3 is characterized in that: The rotor housing (101) is provided with a through hole for the stator central axis (4) to pass through, and the gap between the edge of the through hole and the stator central axis (4) is 1-2 mm.

5. The ultra-thin high power density and high efficiency energy saving low noise fan motor according to claim 1, characterized in that: The magnet (2) is of rectangular structure as a whole.

6. The ultra-thin high power density and high efficiency energy saving low noise fan motor according to claim 1, characterized in that: The magnet (2) has an arc-shaped structure near the inner side surface of the motor housing (1), and has a flat structure away from the inner side surface of the motor housing (1).

7. The ultra-thin high power density and high efficiency energy saving low noise fan motor according to claim 1, characterized in that: The number of the magnets (2) is 22 poles, and the plurality of stator teeth (301) form 18 slots.

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