Single-phase brushless motor

Abstract

The utility model relates to the field of motor, disclose a kind of single-phase brushless motor, motor includes stator and rotor, rotor has 2N rotor magnetic poles, stator includes the N stator core being arranged along the circumference of rotor, stator core has winding part and two stator teeth, stator tooth is arranged at the side of stator core towards rotor, air gap is formed between stator tooth and rotor magnetic pole, winding part is arranged at the side of stator tooth away from rotor, the two stator teeth of stator core are spaced apart along the circumference of rotor and are connected by winding part, motor includes N group winding, and one group winding is wound on the winding part of one stator core, and one stator tooth forms one stator magnetic pole, so that winding quantity is half of rotor magnetic pole quantity, reduce winding cost, improve the overall efficiency of winding winding.

Description

Technical Field

[0001] This utility model relates to the field of electric motors. Background Technology

[0002] Currently, most single-phase brushless motors use conventional stators, with an even number of poles where the number of teeth equals the number of poles. Figure 1 Let's take a motor as an example for explanation. Figure 1 The rotor 20' has 10 rotor poles, and the stator 10' has 10 stator teeth 12'. Armature slots are formed between adjacent stator teeth. Each stator tooth has a winding 16' wound around it, resulting in 10 rotor poles, 10 stator teeth, and 10 windings. The number of rotor poles, stator teeth, and windings is the same and even. The winding directions on adjacent stator teeth are opposite. Figure 2 Each set of windings is connected end-to-end and in series. This type of motor has the following disadvantages:

[0003] 1. The number of windings is the same as the number of rotor poles, resulting in a large number of windings, complex winding, and low winding efficiency;

[0004] 2. The winding direction needs to be changed alternately. For example, the previous stator tooth is wound in the forward direction, and the adjacent stator tooth is wound in the reverse direction, which further complicates the winding and reduces efficiency.

[0005] 3. It has high requirements for the winding machine, requiring a special needle winding machine, and can only wind one stator tooth at a time, resulting in low winding efficiency.

[0006] 4. It is only suitable for series connection between windings, and the motor current and power cannot be made large enough;

[0007] 5. Overall process cost is relatively high. Utility Model Content

[0008] The technical problem to be solved by this utility model is to overcome the defects of existing motors with many windings and complex windings, and to provide a single-phase brushless motor.

[0009] The present invention solves the above-mentioned technical problems through the following technical solution:

[0010] A single-phase brushless motor includes a stator and a rotor. The rotor has 2N rotor poles, where N is an integer. The stator includes N stator cores arranged circumferentially along the rotor. Each stator core has a winding portion and two stator teeth. The stator teeth are located on the side of the stator core facing the rotor, and the winding portion is located on the side of the stator teeth facing away from the rotor. An air gap is formed between the stator teeth and the rotor poles. The two stator teeth of the stator core are spaced apart circumferentially along the rotor and connected by the winding portion. The single-phase brushless motor includes N sets of windings. One set of windings is wound on the winding portion of one stator core. One stator pole is formed at one stator tooth, and the stator poles at the two stator teeth of one stator core have opposite magnetic properties.

[0011] In this scheme, the number of stator cores is set to be half the number of rotor poles. One set of windings is wound on one stator core, and two stator poles with opposite magnetic properties are formed at two stator teeth of one stator core. This makes the number of windings half the number of rotor poles, reducing the number of windings. On the one hand, this can reduce the cost of windings, and on the other hand, it can improve the overall efficiency of the wound windings.

[0012] Preferably, the stator core is U-shaped with the opening facing the rotor.

[0013] In this scheme, the stator core structure is simple and easy to process; on the other hand, the winding can be wound on the winding part of the stator core using a simple ring winding method, resulting in high winding efficiency.

[0014] Preferably, the winding portion extends in a straight line.

[0015] In this design, the winding is arranged in a way that facilitates the winding process.

[0016] Preferably, the winding portion is disposed on the side of the stator core opposite to the rotor.

[0017] In this design, the stator core structure is simple and compact.

[0018] Preferably, the stator tooth includes a first extension and a second extension connected together, the first extension extending along the winding portion toward the rotor, and the second extension extending circumferentially along the rotor and toward another stator tooth of the stator core.

[0019] In this design, the stator teeth are positioned in such a way that the area facing the rotor is increased, thereby enhancing the magnetic driving force generated by the stator on the rotor.

[0020] Preferably, the stator core is self-symmetrically arranged, and the axis of symmetry of the stator core is perpendicular to and passes through the rotation axis of the rotor.

[0021] In this design, the structure is simplified, and the force balance between the stator and rotor is facilitated, thus providing smooth and reliable motor operation.

[0022] Preferably, the winding directions of the N groups of windings are the same.

[0023] In this scheme, the winding process is simple and efficient.

[0024] Preferably, the stator further includes an insulated mounting bracket on which the stator core is mounted.

[0025] In this solution, the stator core with the winding can be installed onto the mounting frame after the winding is wound around the stator core, making the winding operation simple and efficient.

[0026] Preferably, the stator core is detachably mounted on the mounting bracket.

[0027] In this scheme, the setup facilitates the separate maintenance of a portion of the stator core and its windings.

[0028] Preferably, the dimension of the air gap along the radial direction of the rotor is d, and d varies along the circumferential direction of the rotor.

[0029] Preferably, the 2N rotor magnetic poles are evenly arranged along the circumference of the rotor; when N=1, the two stator teeth of the stator core are arranged on opposite sides of the rotor; when N≥2, the N stator cores are evenly spaced along the circumference of the rotor.

[0030] Preferably, the stator is disposed on the outer periphery of the rotor.

[0031] Preferably, the N sets of windings are connected in series or in parallel.

[0032] In this scheme, the windings can be connected in parallel or in series, which increases the freedom and flexibility of motor settings, and the connection method of the windings can be designed according to the power requirements of the motor.

[0033] When N windings are connected in series, the number of windings is reduced to half the number of rotor poles. Under the same voltage, the current and power can be reduced, making it suitable for low-current, low-power motors.

[0034] When N windings are connected in parallel, the power can be increased under the same voltage, making it suitable for low-voltage, high-power motors.

[0035] The positive and progressive effects of this utility model are as follows:

[0036] Setting the number of stator cores to half the number of rotor poles, with one set of windings wound on each stator core, and forming two stator poles with opposite magnetic properties at the two stator teeth of a stator core, so that the number of windings is half the number of rotor poles, can reduce the number of windings. On the one hand, this can reduce winding costs, and on the other hand, it can improve the overall efficiency of the wound windings. Attached Figure Description

[0037] Figure 1 A schematic diagram of an existing motor;

[0038] Figure 2 This is a schematic diagram of the existing motor winding connections;

[0039] Figure 3 This is a schematic diagram of the motor in Example 1;

[0040] Figure 4 The equivalent circuit diagram of the motor in Example 1 is shown below.

[0041] Figure 5 This is the equivalent circuit diagram of the motor in Example 2.

[0042] Explanation of reference numerals in the attached figures:

[0043] Motor 1;

[0044] Stator 10, stator core 11, stator teeth 12, first extension 13, second extension 14, winding part 15, winding 16, air gap 17;

[0045] Rotor 20, rotor pole 21. Detailed Implementation

[0046] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0047] Example 1

[0048] This embodiment provides a single-phase brushless motor, or simply a motor. Figure 3 , Figure 4 This is a schematic diagram of this embodiment.

[0049] like Figure 3, the electric motor 1 comprises a stator 10 and a rotor 20, the rotor 20 has 10 rotor magnetic poles 21, the stator 10 comprises 5 stator cores 11 arranged along the circumferential direction C of the rotor 20, each stator core 11 has a winding portion 15 and two stator teeth 12, the stator teeth 12 are arranged on a side of the stator core 11 facing the rotor 20, the winding portion 15 is arranged on a side of the stator teeth 12 facing away from the rotor 20, an air gap 17 is formed between the stator teeth 12 and the rotor magnetic poles 21, the two stator teeth 12 of the stator core 11 are arranged at intervals along the circumferential direction of the rotor 20 and connected through the winding portion 15, the motor 1 comprises 5 sets of windings 16, one set of winding 16 is wound on the winding portion 15 of one stator core 11, one stator 10 magnetic pole is formed at one stator tooth 12, the stator 10 magnetic poles at the two stator teeth 12 of one stator core 11 have opposite magnetism, such that the number of windings 16 is half of the number of rotor magnetic poles 21, relatively Figure 1 This type of motor reduces the number of windings 16, on one hand, it can reduce the cost of windings 16, and on the other hand, it can improve the overall efficiency of winding the windings 16. Figure 3 The approximate outer contour of the stator 10 is schematically shown by a dotted line. In other embodiments, the shape of the stator 10 can be adjusted according to the performance requirements of the motor 1. Figure 3 The direction of magnetic force lines at the uppermost stator core 11 is marked by an arrow.

[0050] As shown in Figure 3 , the winding portion 15 extends straightly, which facilitates the winding of the winding 16. The winding portion 15 is arranged on a side of the stator core 11 facing away from the rotor 20, so that the stator core 11 has a simple and compact structure.

[0051] As shown in Figure 3 , the stator tooth 12 comprises a connected first extension portion 13 and a second extension portion 14, the first extension portion 13 extends from the winding portion 15 towards the rotor 20, the second extension portion 14 extends along the circumferential direction C of the rotor 20 and faces the other stator tooth 12 of the stator core 11.

[0052] As shown in Figure 4 , the stator core 11 is self-symmetrically arranged, the symmetry axis A of the stator core 11 is perpendicular to and passes through the rotation axis L of the rotor 20, on one hand, the structure is simplified; on the other hand, it facilitates the stress balance of the stator 10 and the rotor 20, and improves the stability and reliability of the operation of the motor 1. Figure 3 in the direction shown, the rotation axis L presents as a point, Figure 3 A star-shaped small dot indicates the position of L.

[0053] As shown in Figure 3 , the stator core 11 generally presents a U-shaped structure with an opening facing the rotor 20. Overall, the shape of the stator core 11 is simple and easy to process, the winding 16 can be wound on the winding portion 15 of the stator core 11 by a simple annular winding method, with high winding efficiency.

[0054] Figure 3 The winding direction of winding 16 is indicated by a circled fork or a small dot, which can also represent the direction of current in winding 16. For example... Figure 3 The five windings 16 are wound in the same direction, making the winding of the windings 16 simple and efficient.

[0055] The stator 10 also includes an insulated mounting bracket, which may, but is not limited to, be made of high-temperature resistant plastic. The stator core 11 is mounted on the mounting bracket for position fixation. The stator core 11 with the windings 16 can be mounted onto the mounting bracket after the windings 16 are wound onto it, further simplifying and simplifying the winding operation. All five sets of windings 16 can be wound before mounting onto the mounting bracket.

[0056] Furthermore, the stator core 11 can be detachably mounted on the mounting bracket, facilitating individual maintenance of a portion of the stator core 11 and its windings 16. Detachable mounting methods include, but are not limited to, plug-in, snap-fit, or threaded connections.

[0057] like Figure 3 The dimension of the air gap 17 along the radial direction of the rotor 20 is d, and d varies along the circumference of the rotor 20, forming a non-uniform air gap 17.

[0058] like Figure 3 The rotor 20 is the inner rotor 20, and the stator 10 is the outer stator 10, which is located on the outer periphery of the rotor 20.

[0059] The multiple windings 16 of this invention can be connected in series or in parallel. For example... Figure 3 In this embodiment, five sets of windings 16 are connected in series. Since the number of windings 16 is... Figure 1 Half of that type of motor, under the same voltage U, can reduce current and power to make it suitable for low-current, low-power motors 1, such as medium-low power motors 1.

[0060] Example 2

[0061] This embodiment provides a single-phase brushless motor. The main difference between this embodiment and embodiment 1 is the winding connection method. The specific structure of the motor can be referred to in embodiment 1 or other embodiments.

[0062] like Figure 4 In this embodiment, five sets of windings are connected in parallel. Compared with windings connected in series, under the same voltage U, the parallel connection of windings can increase the power and is suitable for low-voltage high-power motors, such as high-power motors.

[0063] The motor 1 in Examples 1 and 2 can be assembled in the following manner: windings 16 are wound on each stator core 11 respectively, and the winding direction of each winding 16 can be the same; after each stator core 11 is wound with the back winding 16, it is assembled onto the mounting frame; and then the windings 16 are connected in series or in parallel.

[0064] The smart appliance equipped with this motor has a smart voice control module, which includes 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 perform corresponding operations, thereby realizing intelligent control of the motor and improving the user experience of using the smart appliance.

[0065] Overall, the motor 1 of this utility model has the following advantages:

[0066] 1. The number of windings 16 is halved: The number of windings 16 is half the number of rotor poles 21. For example, the number of windings 16 in a 10-pole motor is 5.

[0067] 2. Each stator core 11 is independent of each other, and multiple sets of stator cores 11 can be wound simultaneously, which greatly improves the winding efficiency.

[0068] 3. The stator core 11 is U-shaped, which requires a low-end winding machine. It does not require a complicated pin winding method, but only a simple and efficient circular winding method.

[0069] 4. The stator core 11 is designed to be suitable for both series connection of winding 16 of small-power motors and parallel connection of winding 16 of large-power motors.

[0070] 5. The winding direction of the windings 16 on each stator core 11 is consistent. Compared with the traditional stator core 11, where the winding direction of the windings 16 on two adjacent teeth needs to be changed alternately, the winding becomes simple and efficient.

[0071] 6. Low process cost: High winding efficiency, and high power density of motor when 16 windings are connected in parallel;

[0072] 7. It satisfies the non-uniform air gap characteristic of unidirectional brushless motors, where the number of stator teeth and rotor poles are equal;

[0073] 8. The motor 1 of this utility model can be applied to any even-numbered pole single-phase brushless motor 1, where N can be any integer greater than or equal to 1.

[0074] 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. A single-phase brushless motor comprising a stator and a rotor, the rotor having 2N rotor poles, N being an integer, characterized in that, The stator includes N stator cores arranged circumferentially along the rotor. Each stator core has a winding portion and two stator teeth. The stator teeth are located on the side of the stator core facing the rotor, and the winding portion is located on the side of the stator teeth facing away from the rotor. An air gap is formed between the stator teeth and the rotor magnetic poles. The two stator teeth of the stator core are spaced apart circumferentially along the rotor and connected by the winding portion. The single-phase brushless motor includes N sets of windings. One set of windings is wound on the winding portion of one stator core. One stator magnetic pole is formed at one stator tooth. The stator magnetic poles at the two stator teeth of one stator core have opposite magnetism.

2. The single-phase brushless motor of claim 1, wherein, The stator core is U-shaped with its opening facing the rotor.

3. The single-phase brushless motor of claim 1, wherein, The winding portion extends straight; And / or, the winding portion is disposed on the side of the stator core opposite to the rotor; And / or, the stator tooth includes a first extension and a second extension connected together, the first extension extending along the winding portion toward the rotor, and the second extension extending circumferentially along the rotor and toward another stator tooth of the stator core.

4. The single-phase brushless motor of claim 1, wherein, The stator core is self-symmetrically arranged, and the axis of symmetry of the stator core is perpendicular to and passes through the rotation axis of the rotor.

5. The single-phase brushless motor of claim 1, wherein, The winding directions of the N groups are the same.

6. The single-phase brushless motor of claim 1, wherein, The stator also includes an insulated mounting bracket on which the stator core is mounted.

7. A single phase brushless motor as claimed in claim 6, wherein, The stator core is detachably mounted on the mounting bracket.

8. The single-phase brushless motor of claim 1, wherein, The dimension of the air gap along the radial direction of the rotor is d, and d varies along the circumferential direction of the rotor.

9. The single-phase brushless motor of claim 1, wherein, The 2N rotor magnetic poles are evenly arranged along the circumference of the rotor; when N=1, the two stator teeth of the stator core are arranged on opposite sides of the rotor; when N≥2, the N stator cores are evenly spaced along the circumference of the rotor. And / or, the stator is disposed on the outer periphery of the rotor.

10. The single-phase brushless motor of claim 1, wherein, The windings in group N are connected in series or in parallel.

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