Brushless motor for mower

Abstract

The brushless motor comprises a stator and a rotor assembly, the stator assembly is sleeved on the outer side of the stator assembly, nine tooth crowns are arranged along the inner circumference of the stator in an inward extending mode, the nine tooth crowns divide the inner circumference of the motor stator into nine equidistant tooth grooves, and the tooth grooves are communicated with the stator assembly. Tooth grooves are formed in the stator, tooth poles are arranged at the tail ends of the tooth grooves, the rotor assembly comprises an integrally-formed rotor core and 12 permanent magnets embedded into the circumferential surface of the rotor core, clamping pieces are arranged on the end faces of the two sides of the stator respectively, each clamping piece comprises a clamping part, the two sides of the tooth crowns are partially wrapped by the first clamping parts, and the two sides of the tooth crowns are partially wrapped by the second clamping parts. And a coil winding is wound on the clamping part. According to the invention, a 9-slot 12-pole structure is adopted. The torque pulsation is relatively small, and more stable torque output can be generated. The mowing machine is more stable in the starting and running process, can output more power under the same input power, reduces the energy consumption, and can prolong the service time of the mowing machine.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of brushless motor, specifically to a brushless motor for mower. BACKGROUND

[0002] Most of the existing mowers adopt brushless motors to drive cutters, and the brushless motor has no mechanical loss of brush, higher efficiency and lower energy consumption compared with the brush motor in the field of mowers. From the perspective of energy consumption, it meets the global promotion trend, can effectively prolong the use time of the mower, in addition, the friction is reduced during operation, the operation is smooth, the noise is significantly reduced, and a more quiet working environment can be provided. It can also realize simple to complex control and can perform various communication requirements (such as 232, 485, can, etc.). In addition to meeting the conventional mechanical action, it can also execute complex control commands, and is more suitable for intelligent control system.

[0003] Most of the current mowers adopt 6-slot 4-pole brushless motors, which have relatively large torque ripple, and the running stability may not be as good as that of motors with more pole slots. When running at high speed, the torque performance may be relatively poor, and the speed regulation range may be relatively narrow. This limits the adaptability of the mower in different working scenarios, for example, for large-area lawns that require rapid mowing, the mower may not be able to perform at its best. SUMMARY

[0004] In order to solve the above problems, the utility model provides a brushless motor for mower, including stator and rotor assembly, the stator assembly is set outside the stator assembly, and 9 tooth crowns are provided along the inner circumference of the stator and extend inward, the 9 tooth crowns divide the inner circumference of the motor stator into 9 equidistant tooth slots, tooth poles are provided at the ends of the tooth slots, the rotor assembly includes an integrally formed rotor core and 12 permanent magnets embedded in the circumferential surface of the rotor core, a rotating shaft is provided at the center of the rotor core, clamping pieces are provided on the end faces of the stator on both sides respectively, the clamping pieces include clamping parts, the clamping parts partially wrap the two sides of the tooth crown, and coil windings are wound on the clamping parts.

[0005] Further, the clamping piece includes a clamping ring that tightly abuts the inner circumference of the stator, the clamping part extends inward along the inner circumference of the stator, a support part is provided on the side of the clamping part close to the tooth pole, the support part is vertically arranged between the clamping part, and when the coil winding is wound on the clamping part, the coil winding is arranged between the support part and the clamping ring.

[0006] Further, a plurality of first grooves are arranged on the circumferential surface of the rotor core at preset intervals, the permanent magnets are embedded in the first grooves and fixedly connected with the first grooves, and gaps are formed between the permanent magnets when the permanent magnets are embedded in the first grooves.

[0007] Further, a through groove is arranged in the rotor core, the through groove is arranged between the first grooves and the rotating shaft, and the through grooves are uniformly arranged around the rotating shaft of the rotor core.

[0008] Further, a first shell and a second shell are arranged on the side of the clamping member away from the stator, the first shell and the second shell cover two sides of the end surface of the stator and rotor assembly respectively, a through hole is arranged in the middle of the first shell, and the rotating shaft passes through the through hole.

[0009] Further, an extension is extended outward along the clamping ring, recessed portions are arranged on the inner walls of the first shell and the second shell, and the extension is embedded in the recessed portions when the first shell and the second shell are respectively arranged on the end surface of the stator and the rotor assembly.

[0010] Further, a containing cavity is arranged in the first shell and the second shell, a bearing is arranged in the containing cavity, and the bearing is sleeved on the rotating shaft.

[0011] Further, a plugging member is arranged between the through hole and the rotating shaft.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] Compared with the 6-slot 4-pole widely used in the traditional mower, the application adopts the structure of 9 tooth grooves and 12 permanent magnets. The torque pulsation is relatively small, and a more stable torque output can be generated. It is more stable during starting and running, and can effectively reduce the vibration of the mower. For the mower that needs high precision control and low vibration operation, it means that it can be more stable when mowing, especially when dealing with uneven lawns, the advantage is more obvious. By optimizing the magnetic field distribution of the motor, the magnetic resistance and eddy current loss in the magnetic circuit can be reduced, thereby improving the efficiency of the motor. Under the same input power, more useful power can be output, energy consumption can be reduced, and the use time of the mower can be prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings described below are only some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0015] Figure 1 The exploded view of the overall structure of the present application;

[0016] Figure 2 The assembly schematic view of the stator and rotor assembly of the present application;

[0017] Figure 3 The structure schematic view of the clamping piece of the present application;

[0018] Figure 4 The assembly schematic view of the clamping piece, stator and rotor assembly of the present application;

[0019] Figure 5 The structure schematic view of the first housing of the present application;

[0020] Figure 6 The sectional view of the present application.

[0021] The reference signs and names in the drawings are as follows:

[0022] Stator 100, rotor assembly 200, crown 110, tooth groove 120, tooth pole 130, rotor core 210, permanent magnet 220, rotating shaft 230, clamping piece 300, clamping part 310, coil winding 320, clamping ring 330, supporting part 340, first recess 211, through groove 212, first housing 400, second housing 500, through hole 410, connecting wire 510, circuit board 520, extension part 331, recessed part 420, accommodating cavity 430, bearing 600, elastic gasket 440, plugging piece 530. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0024] The preferred embodiments of the present application will be further described in combination with the drawings, and the drawings will be combined with the description of the embodiments of the present application. Figures 1 to 4As shown, a brushless motor for a mower includes a stator 100 and a rotor assembly 200, the stator 100 is sleeved outside the stator 100, and 9 tooth crowns 110 are arranged along the inner circumference of the stator 100 and extend inward, the 9 tooth crowns 110 divide the inner circumference of the motor stator 100 into 9 equidistant tooth slots 120, tooth poles 130 are arranged at the ends of the tooth slots 120, the rotor assembly 200 includes an integrally formed rotor core 210 and 12 permanent magnets 220 embedded in the circumferential surface of the rotor core 210, a rotating shaft 230 is arranged at the center of the rotor core 210, clamping pieces 300 are arranged on the end faces of both sides of the stator 100, the clamping pieces 300 include clamping portions 310, the clamping portions 310 wrap around the two sides of the tooth crown 110, and coil windings 320 are wound on the clamping portions 310.

[0025] In the assembly of the present embodiment, the clamping pieces 300 are assembled from the end faces of both sides of the stator 100, respectively, so that the clamping portions 310 can be sleeved from both sides of the tooth crown 110 and wrapped around the two sides of the tooth crown 110, after the wrapping is completed, the coil windings 320 are wound on the clamping portions 310, then the permanent magnets 220 are embedded in the surface of the rotor core 210 and installed in the rotor assembly 200, and finally the coil windings 320 are energized to generate a magnetic field to drive the rotor assembly 200 to rotate.

[0026] Compared with the traditional 6-slot 4-pole widely used in mowers, the present application adopts a structure of 9 tooth slots 120 and 12 permanent magnets 220. The torque ripple is relatively small, and a more stable torque output can be generated. It is more stable during startup and operation, and can effectively reduce the vibration of the mower. For mowers that require high precision control and low vibration operation, this means that the mower can be more stable when mowing, especially when dealing with uneven lawns, the advantage is more obvious. By optimizing the magnetic field distribution of the motor, the magnetic resistance and eddy current loss in the magnetic circuit can be reduced, thereby improving the efficiency of the motor. Under the same input power, more useful power can be output, energy consumption can be reduced, and the use time of the mower can be prolonged.

[0027] On the basis of the above embodiment, in combination with Figure 3 and Figure 4As shown, the clamping piece 300 includes a clamping ring 330 which is tightly arranged inside the inner circumference of the stator 100, the clamping part 310 extends inward along the inner circumference of the stator 100, a supporting part 340 is arranged on the side of the clamping part 310 close to the pole 130, and the supporting part 340 is vertically arranged between the clamping part 310. When the coil winding 320 is wound on the clamping part 310, the coil winding 320 is arranged between the supporting part 340 and the clamping ring 330, so that the supporting part 340 can support the coil winding 320 to prevent the coil winding 320 from moving to the rotor assembly 200.

[0028] Further based on the above embodiments, as shown in Figure 2 As shown, a plurality of first grooves 211 are arranged on the circumferential surface of the rotor core 210 at predetermined intervals, and the permanent magnets 220 are embedded in the first grooves 211 and are fixedly connected with the first grooves 211. When the permanent magnets 220 are embedded in the first grooves 211, gaps are formed between the permanent magnets 220. The gaps can make the air gap between the rotor assembly 200 and the stator 100 non-uniform, so that the distance between the rotor assembly 200 and the stator 100 changes with the rotation of the rotor assembly 200, and thus the density of the magnetic lines of force also changes, thereby generating a wider speed regulation range.

[0029] Further based on the above embodiments, as shown in Figure 2 As shown, a through groove 212 is arranged in the interior of the rotor core 210 and is arranged between the first grooves 211 and the rotating shaft 230. The through groove 212 can reduce the weight of the entire rotor core 210, thereby reducing the moment of inertia of the rotor core 210 and making it easier to brake the rotor core 210. Preferably, the through grooves 212 are uniformly arranged around the rotating shaft 230 of the rotor core 210.

[0030] Further based on the above embodiments, as shown in Figure 1 As shown, a first housing 400 and a second housing 500 are respectively arranged on the side of the clamping piece 300 away from the stator 100, the first housing 400 and the second housing 500 respectively cover the two sides of the end surface of the stator 100 and the rotor assembly 200, a through hole 410 is arranged in the middle of the first housing 400, the rotating shaft 230 passes through the through hole 410, so that external cutting tools and other functional parts can be connected, and a connecting line 510 is arranged outside the second housing 500, the connecting line 510 is electrically connected with a circuit board 520 of the second housing 500, and the connecting line 510 serves to supply power to the coil winding 320.

[0031] In some embodiments, in combination with Figure 3 andFigure 4 As shown in the drawings, the extension 331 extends outwardly along the clamping ring 330, and a recess 420 is arranged on the inner wall of the first shell 400 and the second shell 500. When the first shell 400 and the second shell 500 are respectively mounted on the end face of the stator 100 and the rotor assembly 200, the extension 331 is embedded in the recess 420, thereby tightly covering the end face of the stator 100 and the rotor assembly 200. Thus, when the embodiment is working, it can better prevent weeds or dust from entering the stator 100 and the rotor assembly 200, thereby affecting the working efficiency of the embodiment.

[0032] Further based on the above embodiment, as shown in Figure 1 , Figure 5 and Figure 6 , a receiving cavity 430 is arranged inside the first shell 400 and the second shell 500, and a bearing 600 is arranged in the receiving cavity 430. The bearing 600 is sleeved on the rotating shaft 230, thereby reducing the friction between the rotating shaft 230 and the first shell 400 and the second shell 500.

[0033] In some embodiments, as shown in Figure 6 , the bearing 600 and the support of the second shell 500 are provided with an elastic gasket 440. The elastic gasket 440 is pre-pressed on one side of the bearing 600. Thus, when the rotating shaft 230 deflects in the radial direction, the bearing 600 will be squeezed against the elastic gasket 440, thereby enabling the bearing 600 to operate in a stable state as a whole.

[0034] In some embodiments, as shown in Figure 1 and Figure 6 , a plugging member 530 is arranged between the through hole 410 and the rotating shaft 230. The plugging member 530 is used to block the gap between the through hole 410 and the rotating shaft 230, so as to prevent weeds or dust from entering the stator 100 and the rotor assembly 200 through the gap between the through hole 410 and the rotating shaft 230 during the implementation of the application, thereby affecting the working efficiency of the embodiment.

[0035] The details of the above exemplary embodiments can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A brushless motor for a lawnmower, characterized in that The utility model provides a motor, including stator (100) and rotor assembly (200), the stator (100) assembly sets up outside stator (100) assembly outside, and the inner circumference of stator (100) is provided with 9 tooth crown (110) along the stretch, 9 tooth crown (110) divides the inner circumference of motor stator (100) and forms 9 equidistant tooth slot (120), is provided with tooth pole (130) in the end of tooth slot (120), rotor assembly (200) includes integrative rotor core (210) and 12 permanent magnet (220) embedding the circumference of rotor core (210), is provided with the axle (230) in the center of rotor core (210), is provided with clamping piece (300) respectively on the end face of both sides of stator (100), clamping piece (300) includes clamping part (310), and clamping part (310) forms partial package to both sides of tooth crown (110), and the coil winding (320) is wound on clamping part (310).

2. A brushless motor for a lawnmower according to claim 1, characterized in that, Clamping piece (300) includes clamping ring (330), and clamping ring (330) is tightly attached to the inner side of the inner circumference of stator (100), and clamping part (310) extends inwards along the inner circumference of stator (100), and support part (340) is provided on the side of clamping part (310) close to tooth pole (130), and support part (340) is vertically arranged between clamping part (310), when the coil winding (320) is wound on clamping part (310), the coil winding (320) is arranged between support part (340) and clamping ring (330).

3. The brushless motor for a lawn mower according to claim 1, characterized by, A plurality of first grooves (211) are provided on the circumference of the rotor core (210) at predetermined intervals, the permanent magnets (220) are embedded in the first grooves (211) and are fixedly connected with the first grooves (211), and gaps are formed between the permanent magnets (220) when the permanent magnets (220) are embedded in the first grooves (211).

4. A brushless motor for a lawnmower according to claim 3, characterized in that, A through groove (212) is formed in the interior of the rotor core (210), the through groove (212) is arranged between the first grooves (211) and the axle (230), and the through grooves (212) are evenly arranged around the axle (230) of the rotor core (210).

5. The brushless motor for a lawn mower according to claim 2, characterized by, First and second housings (400) and (500) are respectively arranged on the side of the clamping piece (300) away from the stator (100), the first and second housings (400) and (500) respectively cover both sides of the end faces of the stator (100) and the rotor assembly (200), a through hole (410) is arranged in the middle of the first housing (400), and the axle (230) passes through the through hole (410).

6. A brushless motor for a lawnmower according to claim 5, characterised in that, An extension (331) extends outwardly along the clamping ring (330), and a recess (420) is arranged on the inner wall of the first shell (400) and the second shell (500), and the extension (331) is embedded in the recess (420) when the first shell (400) and the second shell (500) are respectively mounted on the end face of the stator (100) and the rotor assembly (200).

7. A brushless motor for a lawnmower according to claim 6, characterized in that A containing cavity (430) is arranged inside the first shell (400) and the second shell (500), and a bearing (600) is arranged in the containing cavity (430), and the bearing (600) is sleeved on the rotating shaft (230).

8. A brushless motor for a lawnmower according to claim 7, characterized in that, A plugging member (530) is arranged between the through hole (410) and the rotating shaft (230).

Images