WO2013060070A1

WO2013060070A1 - Brushless direct current motor

Info

Publication number: WO2013060070A1
Application number: PCT/CN2011/084111
Authority: WO
Inventors: 郑胜巨
Original assignee: 东莞市万瑞电机有限公司
Priority date: 2011-10-27
Filing date: 2011-12-16
Publication date: 2013-05-02
Also published as: CN103095077B; CN103095077A

Abstract

A brushless direct current motor comprises a casing (1), a front end cover (4), a rear end cover (5), a motor shaft (10), a rotor (11), permanent magnets (12), and stators (13). The motor shaft (10) is sleeved and connected in the casing (1). Two ends of the motor shaft (10) sleeve and are connected to the axes of the front end cover (4) and the rear end cover (5) through bearings (17) respectively. The front end cover (4) and the rear end cover (5) each have an inner side provided with a hollow extension portion. The hollow extension portions sleeve the motor shaft (10). A stator (13) sleeves and is connected to an outer wall of each hollow extension portion. Outer sides of two stators (13) are provided with the rotor (11). The rotor (11) between the two stators (13) is connected to the motor shaft (10). An inner wall of the rotor (11) is provided with the permanent magnets (12) opposite to the stators (13). The permanent magnets (12) opposite to the two stators (13) are disposed in a staggered manner.

Description

无刷直流电机技术领域本发明涉及一种电机技术领域，具体是一种无刷直流电机。 TECHNICAL FIELD The present invention relates to the field of motor technology, and in particular to a brushless DC motor.

说 Say

背景技术目前市场上的直流电机大概有三种： ①书有刷轴传动电机， ②无刷轴传动电机， ③无刷外转传动电机。而以上三种电机都有各自的缺点：有刷轴传动电机虽然用价格较便宜的铁氧体磁钢，但它是通过碳刷和换向器的转换来完成的，而碳刷噪音大、寿命短，有刷马达的使用和维修成本大。无刷轴传动电机因为是内转子传动，其转子的扭力不够，需用磁性很强的材料钕铁硼磁钢来保证扭力。而市场上现钕铁硼的材料价格相当昂贵，这样它的磁钢成本高。无刷外传动电机，一般用作两端固定，中间悬空的行业使用，如风机行业。若要落地使用，需增加 U形支架锁在定子的两端轴心上。但这种加 U形支架方式在新机安装和电机维修时上卸传动带都^麻烦，而且拆卸时有可能会不慎损坏电机，故此种电机使用范围较窄。上述三款直流电机除各自有缺点外，还有共同致命的缺点：无论磁钢装在转子上还是定子上，其一定是N、 S板相邻交替向同一个方向，而相邻的两片磁钢中间一定有缝隙，在旋转时用 N、 S极磁性的切换，一定会造成旋转时不顺畅，有卡卡的问题，受力时会有内振动、抖动的问题，在技术层面上为了解决这些问题，目前情况下只有增加平衡用的飞轮，通过飞轮的重量增加它的惯性力，来消除上述旋转时不顺及卡卡的问题点，而增加飞轮就会增加成本。同时，上述三款直流电机在使用时还会有较大的切频音、哨音，这些声音对室内使用的电器产品，特别是要求安静程度较高的设施、产品都是致命的。目前在这个方面还无法完全解决，只能尽量修改相邻 N、 S极交接点的磁钢形状，增加矽钢片的槽数等来弥补，但也只能尽量将上述声音降低而已，不能百分百消除上述噪音。发明内容本发明的目的是提供一种无刷直流电机，克服了现有技术的上述不足，其旋转顺畅，内振动较低，噪音分贝低，而且没有切频音、哨音。为了达到上述设计目的，本发明采用的技术方案如下：一种无刷直流电机，包括外壳、底座、风扇、前端盖、后端盖、电机轴、转子、永磁体、定子，所述外壳为空心圓柱体结构，外壳下侧中部设有底座，外壳前侧卡套前端盖，外壳后侧卡套后端盖；所述外壳内套接电机轴，电机轴两端分别通过轴 7|套接在前端盖和后端盖的轴心，所述后端盖外侧设有套接在电机轴上的风扇；其中，所述前端盖内侧设有空心延伸部，空心延伸部套在电机轴外，空心延伸部外壁套固一定子，所述后端盖内侧设有空心延伸部，空心延伸部套在电机轴外，空心延伸部外壁套固另一定子，所述两定子外侧设有转子，转子自两个定子之间与电机轴连接，所述转子内壁上与两定子分别相对设有永磁体，所述与两定子分别相对的永磁体错位设置。所述转子主要包括转子环、固定板，转子环为环形结构，转子环内侧中部焊接固定板，所述两组永磁体均沾接在转子环内壁上，两组永磁体分别设置在固定板两侧，固定板同侧的永磁体的排列方式为：相邻的永磁体的 N极和 S 极交替向同一个方向。所述固定板左侧的一片永磁体宽度方向的中心在固定板右侧相邻的两片BACKGROUND OF THE INVENTION There are currently three types of DC motors on the market: 1 book brush shaft drive motor, 2 brushless shaft drive motor, 3 brushless external drive motor. The above three motors have their own shortcomings: Although the brushed shaft drive motor uses a cheaper ferrite magnet, it is completed by the conversion of the carbon brush and the commutator, and the carbon brush is noisy. Short life, brushed motor use and maintenance costs. Because the brushless shaft drive motor is driven by the inner rotor, the torque of the rotor is not enough, and the magnetic material of NdFeB magnet is required to ensure the torque. On the market, the price of bismuth-iron-boron materials is quite expensive, so that its magnetic steel costs are high. Brushless external drive motor is generally used in industries where both ends are fixed and suspended in the middle, such as the fan industry. For floor use, add a U-shaped bracket to the shaft ends of the stator. However, this U-shaped bracket method is troublesome when the new machine is installed and the motor is unloaded, and the motor may be inadvertently damaged during disassembly, so the motor is used in a narrow range. In addition to their respective shortcomings, the above three DC motors have the same fatal disadvantages: no matter whether the magnet is mounted on the rotor or the stator, the N and S plates must be adjacent to each other in the same direction, and the adjacent two pieces There must be a gap in the middle of the magnetic steel. When the magnetic pole is switched with N and S poles, it will definitely cause the rotation to be unsmooth. There is a problem of Kaka, and there will be internal vibration and jitter when the force is applied. To solve these problems, in the current situation, only the flywheel for balancing is added, through the flywheel. The weight increases its inertial force to eliminate the problem of the above-mentioned rotation that does not conform to the Kaka, and the addition of the flywheel increases the cost. At the same time, the above three DC motors will also have large cut-frequency sounds and whistle sounds. These sounds are fatal to the electrical products used indoors, especially those requiring high quietness. At present, it cannot be completely solved in this respect. It can only make up for the shape of the magnetic steel of the adjacent N and S pole junctions, increase the number of slots of the silicon steel sheet, etc., but it can only reduce the above sound as much as possible. Eliminate the above noise in hundreds. SUMMARY OF THE INVENTION An object of the present invention is to provide a brushless DC motor which overcomes the above-mentioned deficiencies of the prior art, which has smooth rotation, low internal vibration, low noise decibel, and no cut-frequency, whistle. In order to achieve the above design, the technical solution adopted by the present invention is as follows: A brushless DC motor includes a casing, a base, a fan, a front end cover, a rear end cover, a motor shaft, a rotor, a permanent magnet, and a stator, and the outer casing is hollow The cylindrical structure has a base in the middle of the lower side of the outer casing, a front end cover of the front side of the outer casing, and a rear end cover of the rear side of the outer casing; the motor shaft is sleeved in the outer casing, and the two ends of the motor shaft are respectively sleeved through the shaft 7| a shaft of the front end cover and the rear end cover, wherein the outer side of the rear end cover is provided with a fan sleeved on the motor shaft; wherein the inner side of the front end cover is provided with a hollow extension portion, and the hollow extension portion is sleeved outside the motor shaft, hollow The outer wall of the extension portion is sleeved, the inner side of the rear end cover is provided with a hollow extension portion, the hollow extension portion is sleeved outside the motor shaft, the outer wall of the hollow extension portion is sleeved with another stator, and the outer side of the two stators is provided with a rotor. The two stators are connected to the motor shaft. The inner wall of the rotor and the two stators are respectively provided with permanent magnets, and the permanent magnets opposite to the two stators are arranged offset. The rotor mainly comprises a rotor ring and a fixed plate. The rotor ring has an annular structure, and the inner part of the inner side of the rotor ring is welded and fixed. The two sets of permanent magnets are respectively attached to the inner wall of the rotor ring, and the two sets of permanent magnets are respectively disposed on both sides of the fixed plate. The permanent magnets on the same side of the fixed plate are arranged in such a way that the N poles and the S poles of the adjacent permanent magnets alternate in the same direction. Two pieces of the center of the permanent magnet in the width direction of the left side of the fixing plate are adjacent to the right side of the fixing plate

7 磁体的缝隙中间。所述固定板上设有通风孔，通风孔与固定板一侧的永磁体相对且大于永磁体的面积，所述固定板的轴心处设有套孔，套孔套固在连接套的外壁上，所述连接套与固定板通过螺釘锁固。所述连接套中部设有套孔，套孔套接电机轴，并通过销固定，所述连接套的外延设有缺口。所述前端盖和后端盖外沿相对设有连耳，前端盖和后端盖的连耳通过连杆连接。所述前端盖和后端盖上分别设有通风孔。所述前端盖的轴承通过卡簧卡固，后端盖的轴承通过卡簧卡固。所述前端盖的轴承通过轴承端盖固定，后端盖的轴承通过轴承端盖固定。本发明所述的无刷直流电机的有益效果是：旋转顺畅，旋转时没有卡卡的问题，内振动较低，噪音分贝低，没有切频音、哨音；使用范围非常广，特别是对环境噪音要求分贝低的设施。产品与同行业产品相比更有优点，如：室内电器产品、医疗器材、健身器材，精密机床，室内自动化设备等等。将左右两边的永磁体用错位方式装在转子内壁上，一边永磁体的中心线与另一边相邻两片永磁体的中间缝隙刚好与它轴向在一条线上，该方法弥补了单 ——组永磁体的缺点，不仅解决了转动不顺畅，哨声，还可以降低成本。该发明的无刷直流电机解决了上述电机使用的局限性，在任何范围及任何设施方面都得到 ^艮好的运用，同时也弥补了有刷电机及传动轴无刷电机因为转子带动轴传动而耗功大的问题，同时也弥补了外转动无刷电机的落地不方便的问题。附图说明图 1是本发明所述的无刷直流电机的立体图。图 2是本发明所述的无刷直流电机的主视图。图 3是本发明所述的无刷直流电机的纵向剖视图。图 4是本发明所述的无刷直流电机的转子的剖视图。图 5是图 4的 A-A视图。图 6是图 4的 B-B视图。图 7是本发明所述的无刷直流电机的转子的左视图。图 8本发明所述的无刷直流电机的电机轴的示意图，其中中段部分剖视。图 9是图 8所述电机轴的左视图。图 10是本发明所述的无刷直流电机的后端盖的纵向剖视图。图中： 1、外壳； 2、底座； 3、风扇； 4、前端盖； 5、后端盖； 6、连杆； 7、连耳； 8、通风孔； 9、散热孔； 10、电机轴； 11、转子； 11-1、转子环； 11-2、固定板； 11-3、套孔； 11-4、螺纹孔； 11-5、通风孔； 12、永磁体； 13、定子； 14、销； 15、螺釘； 16、卡簧； 17、轴承； 18、连接套； 19、螺纹孔； 20、套孔； 21、缺口。具体实施方式下面结合附图对本发明的最佳实施方案作进一步的详细的描述。如图 1-3和 10所示，本发明实施例所述的无刷直流电机，包括外壳 1、底座 2、风扇 3、前端盖 4、后端盖 5、电机轴 10、转子 11、永磁体 12、定子 13, 所述外壳 1为空心圓柱体结构，外壳 1前侧卡套前端盖 4, 外壳 1后侧卡套后端盖 5 , 所述前端盖 4和后端盖 5外沿相对设有连耳 7, 前端盖 4和后端盖 5 的连耳 7通过连杆 6连接，通过连杆 6将前端盖 4和后端盖 5锁紧在外壳 1两侧，落地使用方便，所述前端盖 4和后端盖 5上分别设有通风孔 8, 有利于散热；所述外壳 1下侧中部设有具有支撑作用的底座 2, 所述外壳 1内套接电机轴 10, 电机轴 10两端分别通过轴 7 17套接在前端盖 4和后端盖 5的轴心，所述前端盖 4的轴承 17通过卡簧 16卡固，后端盖 5的轴承 17通过卡簧 16卡固，所述后端盖 5外侧设有套接在电机轴 10上的风扇 3 ,所述前端盖 4内侧设有空心延伸部，空心延伸部套在电机轴 10外，空心延伸部外壁套固一定子 13, 所述后端盖 5 内侧设有空心延伸部，空心延伸部套在电机轴 10外，空心延伸部外壁套固另一定子 13 , 所述两定子 13外侧设有转子 11 , 转子 11 自两个定子 13之间与电机轴 10连接，通过转子 11带动电机轴 10转动，所述转子 11内壁上与两定子 13分别相对设有永磁体 12, 所述与两定子 13分别相对的永磁体 12错位设置。所述无刷直流电机还包括直流电控驱动器，直流电控驱动器位于外壳 1外部或用延长线的方式锁在底座 2上。如图 3-10所示，所述转子 11主要包括转子环 11-1、固定板 11-2, 转子环 11-1为环形结构，转子环 11-1内侧中部焊接固定板 11-2, 所述两组永磁体 12 均沾接在转子环 11-1内壁上，两组永磁体 12分别设置在固定板 11-2两侧，固定板 11-2同侧的永磁体 12的数量可以为 4、 6、 8、 12个，永磁体 12数量越多电机的扭力越大，可根据使用功率大小确定，固定板 11-2同侧的永磁体 12的排列方式为：相邻的永磁体 12的 N极和 S极交替向同一个方向，使用时，永磁体 12可以用材质较便宜的铁氧体，也可以用钕铁硼。所述固定板 11-2左侧的一片永磁体 12宽度方向的中心在固定板 11-2右侧相邻的两片永磁体 12的缝隙中间，即固定板 11-2左侧的每一片永磁体 12与固定板 11-2右侧相邻的永磁体 12交错永磁体 12半片位置，在旋转过程中当一边的定子 13与所述定子 13相对的永磁体 12的 N、 S极切换时，而另一边的定子 13刚好所述定子 13相对的永磁体 12的中间，使得电机旋转时都会出力均匀，不会再有不顺畅、卡卡的问题，同时也不存在有切频音的问题。因为当一边切换时，另一边马上弥补旋转时的扭力，所以切频音和哨音没有，也不需要用飞轮增加它的惯性力，而且此种结构虽然有两套永磁体 12, 两套定子 13 , 但不会增加成本，因为： ①在不使用换向器、碳刷情况下可以使用铁氧体的永磁体 12; ②一个 1.5千瓦的电机，设计时是用一组永磁体 12和一个定子 13来完成，而本发明是将 1.5千瓦的功率设计为左右对称的结构，每一侧的永磁体 12和一个定子 13是原电机永磁体 12和定子 13的一半原材料，即两个 0.75千瓦功率的电机来同样保证力量达到 1.5千瓦。所述固定板 11-2上设有通风孔 11-5, 通风孔 11-5与固定板 11-2—侧的永磁体 12相对且大于永磁体 12的面积，便于固定板 11-2两侧通风、散热，所述固定板 11-2的轴心处设有套孔 11-3 , 套孔 11-3套固在连接套 18的外壁上，所述连接套 18上设有四个螺纹孔 19,连接套 18上的螺纹孔 19通过螺釘 15锁固在固定板 11-2上的螺纹孔 11-4上，从而将固定板 11-2及其转子环 11-1固定在连接套 18上。所述连接套 18中部设有套孔 20, 套孔 20套接电机轴 10, 并通过销 14固定，使得连接套 18与电机轴 10同步转动，且通过销 14可防止连接套 18与电机轴 10在径向方向相对转动，所述连接套 18的外延设有缺口 21 , 通过缺口 21有利于固定板 11-2两侧通风，便于电机散热。本具体实施方式只是用于说明本发明的优选实施例，并不能对本发明进行限定。 7 The middle of the gap of the magnet. The fixing plate is provided with a venting hole, and the venting hole is opposite to the permanent magnet on one side of the fixing plate and larger than the area of the permanent magnet. The fixing plate is provided with a sleeve hole at the axial center, and the hole is sleeved on the outer wall of the connecting sleeve. The connecting sleeve and the fixing plate are locked by screws. A sleeve hole is arranged in a middle portion of the connecting sleeve, the sleeve hole is sleeved to the motor shaft, and is fixed by a pin, and the extension of the connection sleeve is provided with a notch. The outer edge of the front end cover and the rear end cover are oppositely provided with the ear, and the ear of the front end cover and the rear end cover are connected by a connecting rod. Ventilation holes are respectively disposed on the front end cover and the rear end cover. The bearing of the front end cover is clamped by a snap spring, and the bearing of the rear end cover is clamped by a snap spring. The bearing of the front end cover is fixed by a bearing end cover, and the bearing of the rear end cover is fixed by a bearing end cover. The beneficial effects of the brushless DC motor of the invention are: smooth rotation, no card jam when rotating, low internal vibration, low noise decibel, no cut frequency, whistle; a wide range of use, especially for Environmental noise requires a facility with low decibels. Products have advantages compared with products in the same industry, such as: indoor electrical products, medical equipment, fitness equipment, precision machine tools, indoor automation equipment and so on. The permanent magnets on the left and the right are mounted on the inner wall of the rotor in a dislocation manner, and the center slot of the permanent magnet and the middle gap of the two permanent magnets adjacent to the other side are just in line with the axial direction thereof. The shortcomings of the group of permanent magnets not only solve the problem of unsmooth rotation, whistling, but also reduce the cost. The brushless DC motor of the invention solves the limitation of the use of the above-mentioned motor, and is used in any range and any facilities, and also compensates for the brushless motor and the drive shaft brushless motor because the rotor drives the shaft transmission. The problem of large power consumption also makes up for the inconvenience of landing of the externally rotating brushless motor. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspective view of a brushless DC motor according to the present invention. Figure 2 is a front elevational view of the brushless DC motor of the present invention. Figure 3 is a longitudinal cross-sectional view of a brushless DC motor according to the present invention. 4 is a cross-sectional view showing a rotor of a brushless DC motor according to the present invention. Figure 5 is an AA view of Figure 4. Figure 6 is a BB view of Figure 4. Fig. 7 is a left side view of the rotor of the brushless DC motor of the present invention. Figure 8 is a schematic view of the motor shaft of the brushless DC motor according to the present invention, wherein the middle section is partially cut away. Figure 9 is a left side elevational view of the motor shaft of Figure 8. Figure 10 is a longitudinal cross-sectional view of the rear end cover of the brushless DC motor of the present invention. In the figure: 1. Shell; 2. Base; 3. Fan; 4. Front cover; 5. Rear cover; 6. Connecting rod; 11, rotor; 11-1, rotor ring; 11-2, fixed plate; 11-3, sleeve hole; 11-4, threaded hole; 11-5, vent hole; 12, permanent magnet; 13, stator; , pin; 15, screw; 16, spring; 17, bearing; 18, connecting sleeve; 19, threaded hole; 20, set hole; 21, notch. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be further described in detail with reference to the accompanying drawings. As shown in FIGS. 1-3 and 10, the brushless DC motor according to the embodiment of the present invention includes a casing 1, a base 2, a fan 3, a front end cover 4, a rear end cover 5, a motor shaft 10, a rotor 11, and a permanent magnet. 12, the stator 13, the outer casing 1 is a hollow cylindrical structure, the front side of the outer casing 1 is ferrule front end cover 4, after the rear side of the outer casing 1 is ferrule The end cover 5, the front end cover 4 and the rear end cover 5 are provided with the connecting ears 7 on the outer edge thereof, and the connecting ears 7 of the front end cover 4 and the rear end cover 5 are connected by the connecting rod 6, and the front end cover 4 is connected through the connecting rod 6. The rear end cover 5 is locked on both sides of the outer casing 1 and is conveniently used for landing. The front end cover 4 and the rear end cover 5 are respectively provided with ventilation holes 8 for facilitating heat dissipation; the lower portion of the outer casing 1 is provided with a supporting function. The base 2 is sleeved with the motor shaft 10, and the two ends of the motor shaft 10 are respectively sleeved on the axis of the front end cover 4 and the rear end cover 5 through the shaft 7 17, and the bearing 17 of the front end cover 4 passes the card. The spring 16 is fastened, and the bearing 17 of the rear end cover 5 is fastened by a retaining ring 16 . The outer end of the rear end cover 5 is provided with a fan 3 sleeved on the motor shaft 10 , and the inner end of the front end cover 4 is provided with a hollow extension. The hollow extension is sleeved outside the motor shaft 10, and the outer wall of the hollow extension portion is sleeved with a fixed portion 13. The inner side of the rear end cover 5 is provided with a hollow extension portion, and the hollow extension portion is sleeved outside the motor shaft 10, and the outer wall of the hollow extension portion is sleeved. The other stator 13 is provided with a rotor 11 outside the two stators 13. The rotor 11 is connected from the two stators 13 to the motor shaft 10, and the motor is driven by the rotor 11. 10 rotates the rotor 13 and two stators are provided with opposing permanent magnets 12, the offset 12 is provided with two stator 13 are opposed to the permanent magnets 11 on the inner wall. The brushless DC motor further includes a DC electronically controlled driver, and the DC electronically controlled driver is located outside the casing 1 or is locked to the base 2 by an extension cable. As shown in FIG. 3-10, the rotor 11 mainly includes a rotor ring 11-1, a fixed plate 11-2, a rotor ring 11-1 is an annular structure, and a middle inner portion of the rotor ring 11-1 is welded with a fixing plate 11-2. The two sets of permanent magnets 12 are respectively attached to the inner wall of the rotor ring 11-1, and the two sets of permanent magnets 12 are respectively disposed on two sides of the fixed plate 11-2, and the number of permanent magnets 12 on the same side of the fixed plate 11-2 can be 4. 6, 8, 12, the more the number of permanent magnets 12, the greater the torque of the motor, which can be determined according to the power used. The arrangement of the permanent magnets 12 on the same side of the fixed plate 11-2 is as follows: N of the adjacent permanent magnets 12 The pole and the S pole alternate in the same direction. When used, the permanent magnet 12 can be made of ferrite which is cheaper in material or neodymium iron boron. The center of the width direction of one permanent magnet 12 on the left side of the fixing plate 11-2 is in the middle of the gap between the two permanent magnets 12 adjacent to the right side of the fixing plate 11-2, that is, each piece on the left side of the fixing plate 11-2. The permanent magnet 12 adjacent to the right side of the fixed plate 11-2 is staggered at a half piece position of the permanent magnet 12, and when the stator 13 of one side is switched with the N and S poles of the permanent magnet 12 opposite to the stator 13 during the rotation, The stator 13 on the other side is just in the middle of the permanent magnet 12 opposite to the stator 13, so that the motor will have a uniform output when the motor rotates, and there will be no problem of unsmooth, kaka, and there is no problem of cut frequency. Because when cutting one side In time, the other side immediately compensates for the torsion during rotation, so there is no cut frequency and whistle, and there is no need to use a flywheel to increase its inertial force. Moreover, although this structure has two sets of permanent magnets 12 and two sets of stators 13, No increase in cost, because: 1 can use ferrite permanent magnet 12 without using commutator, carbon brush; 2 a 1.5 kW motor, designed with a set of permanent magnets 12 and a stator 13 The invention is designed to design a power of 1.5 kilowatts into a bilaterally symmetrical structure. The permanent magnets 12 and one stator 13 on each side are half of the raw materials of the permanent magnets 12 and 13 of the original motor, that is, two motors of 0.75 kilowatts. The same guarantee power is 1.5 kW. The fixing plate 11-2 is provided with a venting hole 11-5. The venting hole 11-5 is opposite to the permanent magnet 12 on the side of the fixing plate 11-2 and larger than the area of the permanent magnet 12, so as to facilitate fixing the sides of the plate 11-2. Ventilation and heat dissipation, a sleeve hole 11-3 is defined in the axial center of the fixing plate 11-2, and the sleeve hole 11-3 is sleeved on the outer wall of the connecting sleeve 18, and the connecting sleeve 18 is provided with four threaded holes. 19, the threaded hole 19 in the connecting sleeve 18 is locked on the threaded hole 11-4 of the fixing plate 11-2 by the screw 15, thereby fixing the fixing plate 11-2 and its rotor ring 11-1 to the connecting sleeve 18. . A sleeve hole 20 is defined in the middle of the connecting sleeve 18, and the sleeve hole 20 is sleeved to the motor shaft 10, and is fixed by the pin 14, so that the connecting sleeve 18 rotates synchronously with the motor shaft 10, and the connecting sleeve 18 and the motor shaft are prevented by the pin 14. 10 is relatively rotated in the radial direction, and the extension of the connecting sleeve 18 is provided with a notch 21, and the notch 21 facilitates ventilation on both sides of the fixing plate 11-2, thereby facilitating heat dissipation of the motor. This detailed description is only intended to illustrate the preferred embodiments of the invention, and is not intended to limit the invention.

Claims

权利要求书 Claim

1、一种无刷直流电机，包括外壳、底座、风扇、前端盖、后端盖、电机轴、转子、永磁体、定子，所述外壳为空心圓柱体结构，外壳下侧中部设有底座，外壳前侧卡套前端盖，外壳后侧卡套后端盖；所述外壳内套接电机轴，电机轴两端分别通过轴承套接在前端盖和后端盖的轴心，所述后端盖外侧设有套接在电机轴上的风扇；其特征在于：所述前端盖内侧设有空心延伸部，空心延伸部套在电机轴外，空心延伸部外壁套固一定子，所述后端盖内侧设有空心延伸部，空心延伸部套在电机轴外，空心延伸部外壁套固另一定子，所述两定子外侧设有转子，转子自两个定子之间与电机轴连接，所述转子内壁上与两定子分别相对设有永磁体，所述与两定子分别相对的永磁体错位设置。 A brushless DC motor comprising a housing, a base, a fan, a front end cover, a rear end cover, a motor shaft, a rotor, a permanent magnet, and a stator, wherein the outer casing has a hollow cylindrical structure, and a base is disposed at a lower portion of the lower side of the outer casing. a front end cover of the front side of the outer casing, and a rear end cover of the rear side of the outer casing; the outer casing of the outer casing is sleeved with the motor shaft, and the two ends of the motor shaft are respectively sleeved on the axial center of the front end cover and the rear end cover by the bearing, the rear end The outer side of the cover is provided with a fan that is sleeved on the motor shaft; and the inner end of the front end cover is provided with a hollow extension portion, the hollow extension portion is sleeved outside the motor shaft, and the outer wall of the hollow extension portion is fixed to the stator, the rear end a hollow extension portion is disposed on the inner side of the cover, the hollow extension portion is sleeved outside the motor shaft, the outer wall of the hollow extension portion is sleeved with another stator, and the outer side of the two stators is provided with a rotor, and the rotor is connected from the two stators to the motor shaft. A permanent magnet is disposed on the inner wall of the rotor opposite to the two stators, and the permanent magnets opposite to the two stators are disposed offset.

2、根据权利要求 1所述的无刷直流电机，其特征在于：所述转子主要包括转子环、固定板，转子环为环形结构，转子环内侧中部焊接固定板，所述两组永磁体均沾接在转子环内壁上，两组永磁体分别设置在固定板两侧，固定板同侧的永磁体的排列方式为：相邻的永磁体的 N极和 S极交替向同一个方向。 2. The brushless DC motor according to claim 1, wherein: the rotor mainly comprises a rotor ring and a fixed plate, wherein the rotor ring is a ring structure, and the inner side of the rotor ring is welded and fixed, and the two sets of permanent magnets are dipped. Connected to the inner wall of the rotor ring, two sets of permanent magnets are respectively arranged on both sides of the fixed plate, and the permanent magnets on the same side of the fixed plate are arranged in the same way: the N pole and the S pole of the adjacent permanent magnets alternate in the same direction.

3、根据权利要求 2所述的无刷直流电机，其特征在于：所述固定板左侧的一片永磁体宽度方向的中心在固定板右侧相邻的两片永磁体的缝隙中间。 3. The brushless DC motor according to claim 2, wherein a center of a width direction of a permanent magnet on a left side of the fixing plate is intermediate a slit of two permanent magnets adjacent to a right side of the fixing plate.

4、根据权利要求 2或 3所述的无刷直流电机，其特征在于：所述固定板上设有通风孔，通风孔与固定板一侧的永磁体相对且大于永磁体的面积，所述固定板的轴心处设有套孔，套孔套固在连接套的外壁上，所述连接套与固定板通过螺釘锁固。 The brushless DC motor according to claim 2 or 3, wherein: the fixing plate is provided with a venting hole, and the venting hole is opposite to the permanent magnet on the side of the fixing plate and larger than the area of the permanent magnet, A sleeve hole is defined in the shaft center of the fixing plate, and the sleeve hole is sleeved on the outer wall of the connecting sleeve, and the connecting sleeve and the fixing plate are locked by screws.

5、根据权利要求 2或 3所述的无刷直流电机，其特征在于：所述连接套中部设有套孔，套孔套接电机轴，并通过销固定，所述连接套的外延设有缺口。 The brushless DC motor according to claim 2 or 3, wherein: the middle portion of the connecting sleeve is provided with a sleeve hole, the sleeve hole is sleeved with the motor shaft, and is fixed by a pin, and the extension of the connection sleeve is provided gap.

6、根据权利要求 1或 2或 3所述的无刷直流电机，其特征在于：所述前端盖和后端盖外沿相对设有连耳，前端盖和后端盖的连耳通过连杆连接。 The brushless DC motor according to claim 1 or 2 or 3, wherein: the front end cover and the rear end cover are provided with a connecting ear on the outer edge, and the front end cover and the rear end cover are connected through the connecting rod connection.

7、根据权利要求 1或 2或 3所述的无刷直流电机，其特征在于：所述前端盖和后端盖上分别设有通风孔。 The brushless DC motor according to claim 1 or 2 or 3, wherein the front end cover and the rear end cover are respectively provided with ventilation holes.

8、根据权利要求 1或 2或 3所述的无刷直流电机，其特征在于：所述前端盖的轴承通过卡簧卡固，后端盖的轴承通过卡簧卡固。 A brushless DC motor according to claim 1 or 2 or 3, wherein: the bearing of the front end cover is clamped by a snap spring, and the bearing of the rear end cover is clamped by a spring.

9、根据权利要求 1或 2或 3所述的无刷直流电机，其特征在于：所述前端盖的轴承通过轴承端盖固定，后端盖的轴承通过轴承端盖固定。 A brushless DC motor according to claim 1 or 2 or 3, wherein: the bearing of the front end cover is fixed by a bearing end cover, and the bearing of the rear end cover is fixed by a bearing end cover.