Brushless motor for wall breaking machine

Abstract

The utility model discloses a brushless motor for a wall breaking machine, which comprises a rotor assembly, the rotor assembly comprises a rotor ring, a tooth crown is arranged along the outer circumference of the rotor ring in an outward extending manner, a coil winding is wound on the tooth crown, the coil winding is made of an aluminum wire material, and the rotor ring is made of a stainless steel wire. Tooth crowns are arranged in the rotor assembly, the outer circumference of the rotor ring is divided into a plurality of tooth grooves by the tooth crowns, a stator assembly is sleeved outside the rotor assembly, the stator assembly comprises a stator ring and a permanent magnet, a driving assembly is arranged in the rotor ring, the driving assembly comprises a driving shaft, and a blade is arranged on the driving shaft. The driving shaft is clamped to the inner circumference of the rotor ring through the driving assembly, the stability of connection between the driving shaft and the rotor ring is further guaranteed, meanwhile, in the field of wall breaking machines, the motor has good quietness while running at a low speed and guaranteeing the torque, the coil winding is made of an aluminum wire material, the production cost is effectively reduced, and meanwhile the service life of the motor is prolonged. And the overall weight of the motor can be reduced.

Description

TECHNICAL FIELD

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

[0002] Most of the wall breaking machine adopts brush series excited motor to drive blade, in the existing wall breaking machine, the rotor of brush series excited motor is usually directly connected with the rotating shaft, its characteristics are high rotating speed, large locked-rotor torque and high noise, at the same time, the vibration generated by the rotor in high speed rotation will be directly transmitted to the rotating shaft, and then affect the stability of the whole wall breaking machine, long-term vibration may cause other parts inside the wall breaking machine, such as blade and cup body, to be loose, which affects the normal use and service life of the wall breaking machine, in addition, in the existing wall breaking machine, the coil winding of brush series excited motor is usually made of copper wire, although the copper wire has low resistance, but it has high cost and heavy weight. SUMMARY

[0003] In order to solve the above problems, the utility model provides a brushless motor for wall breaking machine, which comprises a rotor assembly, the rotor assembly comprises a rotor ring, a tooth crown is provided outside the outer circumference of the rotor ring, a coil winding is wound on the tooth crown, the coil winding is made of aluminum wire material, the tooth crown divides the outer circumference of the rotor ring into a plurality of tooth slots, a stator assembly is provided outside the rotor assembly, the stator assembly comprises a stator ring and a permanent magnet, the stator ring is provided outside the tooth crown, the permanent magnet is embedded in the inner circumference of the stator ring and is arranged opposite to the tooth crown, a driving assembly is provided in the rotor ring, the driving assembly is clamped in the inner circumference of the rotor ring, the driving assembly comprises a driving shaft, and a blade is arranged on the driving shaft.

[0004] Further, the number of tooth crown and tooth slot is 12, and the number of permanent magnet is 14.

[0005] Further, a heat insulation piece is arranged in the tooth slot, the heat insulation piece is tightly attached to the two sides of the tooth crown, and the heat insulation piece is arranged between the coil winding and the tooth crown.

[0006] Further, a tooth pole is arranged at the end of the tooth crown, the heat insulation piece comprises a first contact surface, a second contact surface and a third contact surface, the first contact surface is tightly attached to the two sides of the tooth crown, the second contact surface is tightly attached to the outer circumferential surface of the rotor ring, and the third contact surface is tightly attached to the inner side of the tooth pole.

[0007] Further, the driving assembly further comprises a connecting sleeve, the driving shaft is arranged in the connecting sleeve, a plurality of clamping grooves are arranged in the connecting sleeve, a plurality of clamping blocks are protruded inwardly on the inner circumference of the rotor ring, when the driving assembly is assembled into the rotor ring, the clamping blocks are clamped with the clamping grooves.

[0008] Further, bearings are arranged between the connecting sleeve and the driving shaft, the bearings are arranged at two ends of the connecting sleeve respectively, and the bearing sleeves are sleeved on the driving shaft.

[0009] Further, a wire interface is arranged at the end of the connecting sleeve away from the blade.

[0010] Further, a recess is arranged in the inner circumference of the stator ring, and the permanent magnet is embedded in the recess through interference fit.

[0011] Compared with the prior art, the utility model has the advantages that:

[0012] Compared with the traditional driving shaft directly connected with the rotor ring, the driving shaft is clamped on the inner circumference of the rotor ring through the driving assembly, the contact area between the two is increased, the stability of the connection between the two is further ensured through the clamping structure, the locked-rotor torque of the high-speed motor is achieved, and since the application belongs to a short-time working state in the field of wall breaking machines, the aluminum wire material is used for the coil winding to effectively reduce the production cost, the overall weight of the motor is reduced, and the application has good quietness when running at low speed. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the drawings without creative labor.

[0014] Figure 1 It is the exploded view of the overall structure of the utility model;

[0015] Figure 2 It is the structure schematic view of the rotor assembly and the stator assembly of the utility model;

[0016] Figure 3 It is the structure schematic view of the heat insulation piece and the rotor ring of the utility model;

[0017] Figure 4 It is the structure schematic view of the driving assembly of the utility model.

[0018] The reference signs and names in the figures are as follows:

[0019] Rotor assembly 100, rotor ring 110, tooth crown 120, coil winding 130, tooth slot 140, stator assembly 200, stator ring 210, permanent magnet 220, driving assembly 300, driving shaft 310, blade 320, heat insulation piece 150, tooth pole 160, first contact surface 151, second contact surface 152, third contact surface 153, connecting sleeve 330, clamping groove 331, clamping block 111, bearing 340, wire interface 350, groove 211. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0021] The present application will be described in more detail. It should be understood that the specific embodiments described herein are merely intended to explain the present application and not to limit the present application. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element or one or more intervening elements can be present therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element or one or more intervening elements can be present therebetween.

[0022] In the description of the present application, it should be noted that the orientation words such as "front, rear, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component. In the description of the present application, it should be noted that the use of the words "first", "second" and the like to limit the parts, is only for the convenience of distinguishing the corresponding parts, and unless otherwise stated, the above words have no special meaning, and therefore cannot be understood as a limitation on the scope of protection of the present application. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0023] Unless otherwise defined, all technical and scientific terms used in the present disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0024] In addition, the technical features involved in different embodiments of the application described below can be combined with each other as long as there is no conflict.

[0025] The preferred embodiments of the application will be further described with reference to the drawings. A brushless motor for a wall breaking machine comprises a rotor assembly 100, the rotor assembly 100 comprising a rotor ring 110, a crown 120 extending outward along the outer circumference of the rotor ring 110, a coil winding 130 wound on the crown 120, the coil winding 130 being made of aluminum wire, the crown 120 dividing the outer circumference of the rotor ring 110 into a plurality of tooth slots 140, a stator assembly 200 being provided outside the rotor assembly 100, the stator assembly 200 comprising a stator ring 210 and a permanent magnet 220, the stator ring 210 being provided outside the crown 120, the permanent magnet 220 being embedded in the inner circumference of the stator ring 210 and being arranged opposite to the crown 120, a driving assembly 300 being provided inside the rotor ring 110, the driving assembly 300 being clamped to the inner circumference of the rotor ring 110, the driving assembly 300 comprising a driving shaft 310, the driving shaft 310 being provided with a blade 320.

[0026] In the working state of the present embodiment, the coil winding 130 is first arranged on the crown 120, then the driving assembly 300 is clamped to the inner circumference of the rotor ring 110, and finally the rotor ring 110 is sleeved into the stator ring 210, so that the crown 120 is aligned with the permanent magnet 220 and maintains a certain gap. Finally, the coil winding 130 is energized to generate a magnetic field to drive the rotor assembly 100 to rotate, thereby driving the driving shaft 310 and the blade 320 on the driving assembly 300 to rotate synchronously.

[0027] Compared with the conventional driving shaft 310 directly connected to the rotor ring 110, the driving shaft 310 of the present application is clamped to the inner circumference of the rotor ring 110 by the driving assembly 300, which increases the contact area between the two and further ensures the stability of the connection between the two through the clamping structure. At the same time, since the present application belongs to a short-time working state in the field of wall breaking machines, the coil winding 130 made of aluminum wire can effectively reduce production costs while also reducing the overall weight of the motor.

[0028] Further to the above embodiments, the number of the tooth crown 120 and the tooth slot 140 is 12, and the number of the permanent magnet 220 is 14. The structure of 12 tooth slots 140 and 12 permanent magnets 220 between the rotor assembly 100 and the stator assembly 200 can output greater torque at low speed, so that the driving shaft 310 can drive the blade 320 to improve the breaking wall effect.

[0029] Further to the above embodiments, the heat insulation piece 150 is arranged in the tooth slot 140, the heat insulation piece 150 is tightly attached to the two sides of the tooth crown 120, and the heat insulation piece 150 is arranged between the coil winding 130 and the tooth crown 120. Since the coil winding 130 is made of aluminum wire, the resistivity of aluminum is about 1.6 times that of copper. Under the same coil size and number of turns, the resistance of the aluminum wire coil will be greater than that of the copper wire coil. Therefore, when the current passes through, the aluminum wire coil will generate more heat. Therefore, the heat insulation piece 150 is arranged between the coil winding 130 and the tooth crown 120 to avoid excessive heat transfer from the coil winding 130 to the rotor assembly 100, thereby affecting the operation of the entire motor.

[0030] In some embodiments, the tooth pole 160 is arranged at the end of the tooth crown 120, the heat insulation piece 150 includes a first contact surface 151, a second contact surface 152, and a third contact surface 153, the first contact surface 151 is tightly attached to the two sides of the tooth crown 120, the second contact surface 152 is tightly attached to the outer circumferential surface of the rotor ring 110, and the third contact surface 153 is tightly attached to the inner side of the tooth pole 160. When the coil winding 130 is arranged on the tooth crown 120, the inner side, top and bottom of the coil winding 130 are in contact with the heat insulation piece 150, thereby achieving better heat insulation effect.

[0031] Further to the above embodiments, the driving assembly 300 further includes a connecting sleeve 330, the driving shaft 310 is arranged in the connecting sleeve 330, a plurality of clamping grooves 331 are arranged in the connecting sleeve 330, and a plurality of clamping blocks 111 are protruded inwardly from the inner circumferential surface of the rotor ring 110. When the driving assembly 300 is assembled into the rotor ring 110, the clamping blocks 111 and the clamping grooves 331 are clamped and connected, so that the driving assembly 300 and the rotor ring 110 are fixed in the circumferential direction. Therefore, when the rotor assembly 100 rotates, the driving assembly 300 can be driven to rotate synchronously.

[0032] In some embodiments, the bearing 340 is arranged between the connecting sleeve 330 and the driving shaft 310, the bearing 340 is arranged at the two ends of the connecting sleeve 330 respectively, and the bearing 340 is sleeved on the driving shaft 310, thereby reducing the friction between the driving shaft 310 and the connecting sleeve 330.

[0033] In some embodiments, a wire interface 350 is provided at the end of the connecting sleeve 330 away from the blade 320, which is used to connect with the external power supply, so that the coil winding 130 is powered.

[0034] Further to the above embodiments, a recess 211 is provided in the inner circumference of the stator ring 210, and the permanent magnet 220 is embedded in the recess 211 by interference fit, so as to fix the permanent magnet 220 on the stator ring 210.

[0035] The details of the above exemplary embodiments, and in the absence of departing from the spirit or basic characteristics of the present application, can be implemented in other specific forms of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and therefore 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 cell disruptor, characterized by, The application relates to a rotor assembly (100) comprising a rotor ring (110), a crown (120) extending outward along the outer periphery of the rotor ring (110), a coil winding (130) wound on the crown (120), the coil winding (130) being made of aluminum wire, the crown (120) dividing the outer periphery of the rotor ring (110) into a plurality of tooth slots (140), a stator assembly (200) arranged outside the rotor assembly (100), the stator assembly (200) comprising a stator ring (210) and permanent magnets (220), the stator ring (210) being arranged outside the crown (120), the permanent magnets (220) being embedded in the inner periphery of the stator ring (210) and arranged opposite to the crown (120), a driving assembly (300) arranged in the rotor ring (110), the driving assembly (300) being clamped to the inner periphery of the rotor ring (110), the driving assembly (300) comprising a driving shaft (310), the driving shaft (310) being provided with a blade (320).

2. The brushless motor for a cell disruptor according to claim 1, characterized by, The number of the crown (120) and the tooth slot (140) is 12, and the number of the permanent magnet (220) is 14.

3. The brushless motor for a cell disruptor according to claim 2, wherein A heat insulating piece (150) is arranged in the tooth slot (140), the heat insulating piece (150) being tightly attached to the two sides of the crown (120), and the heat insulating piece (150) being arranged between the coil winding (130) and the crown (120).

4. The brushless motor for a cell disruptor according to claim 3, wherein A tooth pole (160) is arranged at the end of the crown (120), the heat insulating piece (150) comprising a first contact surface (151), a second contact surface (152) and a third contact surface (153), the first contact surface (151) being tightly attached to the two sides of the crown (120), the second contact surface (152) being tightly attached to the outer periphery of the rotor ring (110), and the third contact surface (153) being tightly attached to the inner side of the tooth pole (160).

5. The brushless motor for a cell disruptor according to claim 1, wherein The driving assembly (300) further comprises a connecting sleeve (330), the driving shaft (310) being arranged in the connecting sleeve (330), a plurality of clamping grooves (331) being arranged in the connecting sleeve (330), a plurality of clamping blocks (111) being protruded inward from the inner periphery of the rotor ring (110), when the driving assembly (300) is assembled into the rotor ring (110), the clamping blocks (111) are clamped to the clamping grooves (331).

6. The brushless motor for a cell disruptor according to claim 5, wherein A bearing (340) is arranged between the connecting sleeve (330) and the driving shaft (310), the bearing (340) being arranged at the two ends of the connecting sleeve (330) respectively, and the bearing (340) being sleeved on the driving shaft (310).

7. The brushless motor for a cell disruptor according to claim 6, wherein A wire interface (350) is arranged at the end of the connecting sleeve (330) away from the blade (320).

8. The brushless motor for a cell disruptor according to claim 4, wherein A recess (211) is arranged in the inner periphery of the stator ring (210), and the permanent magnet (220) is embedded in the recess (211) through interference fit.

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