CN1160303A - Outer rotor type brushless DC(BLDC) motor - Google Patents

Outer rotor type brushless DC(BLDC) motor Download PDF

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Publication number
CN1160303A
CN1160303A CN97100865A CN97100865A CN1160303A CN 1160303 A CN1160303 A CN 1160303A CN 97100865 A CN97100865 A CN 97100865A CN 97100865 A CN97100865 A CN 97100865A CN 1160303 A CN1160303 A CN 1160303A
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stator
rotor
pcb
motor
bldc
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CN1068469C (en
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申铉定
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Brushless Motors (AREA)

Abstract

一种外转子型BLDC电动机，包括：一个转轴；一个沿着电动机的外周设置有同转轴一起旋转的转子；一个设在转子的外周内部并具有排列在其上的永磁体的转子铁心；一个固定在转轴与转子之间的定子；多个分别绕制了定子绕组并面对永磁体的定子铁心；以及一个嵌入固定到定子极片之间的空间中的检测单元。改善了霍耳传感器的检测效果，延长了寿命，提高了产品可靠性。

Figure 97100865

An outer rotor type BLDC motor, comprising: a rotating shaft; a rotor that rotates with the rotating shaft along the outer periphery of the motor; a rotor core that is arranged inside the outer periphery of the rotor and has permanent magnets arranged thereon; a fixed A stator between the rotating shaft and the rotor; a plurality of stator cores respectively wound with stator windings and facing the permanent magnets; and a detection unit embedded and fixed in the space between the stator pole pieces. The detection effect of the Hall sensor is improved, the service life is prolonged, and the product reliability is improved.

Figure 97100865

Description

外转子型无刷直流电动机Outer rotor type brushless DC motor

本发明涉及一种外转子型无刷DC(BLDC)电动机，特别是涉及一种改进的外转子型BLDC电动机，用于通过检测转子的位置来依次接通流过定子绕组的电流，并且配合传感器外壳以及把定子极固定到检测产生转矩的传感器单元的位置上，由此减少装配时间，降低成本并改善产品可靠性。The present invention relates to an outer rotor type brushless DC (BLDC) motor, in particular to an improved outer rotor type BLDC motor, which is used to sequentially connect the current flowing through the stator winding by detecting the position of the rotor, and cooperate with the sensor Housing and securing the stator poles to the position of the sensor unit that detects the generated torque, thereby reducing assembly time, reducing costs and improving product reliability.

如图1所示，现有的外转子型BLDC电动机包括一个可旋转地装在其中心的用于发出转矩的轴1。参照图2，沿着电动机的外周设置的外转子2以其一端部同心地联结在轴1的一个端部上，以便于同旋转的轴1一起旋转。As shown in FIG. 1, a conventional outer rotor type BLDC motor includes a shaft 1 rotatably mounted at the center thereof for generating torque. Referring to FIG. 2 , an outer rotor 2 disposed along the outer periphery of the motor is concentrically coupled with one end thereof to one end of a shaft 1 so as to rotate together with the rotating shaft 1 .

在包括该转子2在内的电动机的外周中设有转子铁心3和排列在转子铁心3上以依次释放电流的永磁体4。In the outer periphery of the motor including this rotor 2 are provided a rotor core 3 and permanent magnets 4 arranged on the rotor core 3 to sequentially discharge current.

沿着转子铁心3和磁体4的一边设有沿着电动机的圆周伸出的位置检测永磁体5。磁体5具有与转子2一样多的交替设在其中的磁极，由此产生磁通。Along one side of the rotor core 3 and the magnet 4, a position detecting permanent magnet 5 protruding along the circumference of the motor is provided. The magnet 5 has as many magnetic poles arranged alternately therein as the rotor 2 , whereby a magnetic flux is generated.

在转子轴1和转子2之间设有一个定子6，沿着定子6的外周设有多个被定子线圈7绕在其上的定子铁心8。A stator 6 is provided between the rotor shaft 1 and the rotor 2 , and a plurality of stator cores 8 around which stator coils 7 are wound are provided along the outer periphery of the stator 6 .

永磁体4与定子线圈7相互面对。The permanent magnet 4 and the stator coil 7 face each other.

如图2、3所示的那样，在定子6的一个端面的一部分上设有一个支柱13，以便用螺旋12将PCB 10紧固在支柱13上。As shown in Figures 2 and 3, a part of an end face of the stator 6 is provided with a pillar 13, so that the PCB 10 is fastened on the pillar 13 with a screw 12.

一个霍耳效应传感器9被装在面对位置检测永磁体5的端面的PCB10的下外表面上。A Hall effect sensor 9 is mounted on the lower outer surface of the PCB 10 facing the end surface of the position detecting permanent magnet 5 .

检测PCB 10给霍耳效应传感器9提供电压，该霍耳效应传感器9根据由位置检测永磁体5产生的磁通的大小和方向依次发生电压信号。The detection PCB 10 supplies a voltage to the Hall effect sensor 9, and the Hall effect sensor 9 sequentially generates voltage signals according to the magnitude and direction of the magnetic flux generated by the position detection permanent magnet 5.

而且，在检测PCB 10上焊接传感器导线11以便把从检测PCB 10输出的电压信号传输给定子线圈7。Also, a sensor wire 11 is welded on the detection PCB 10 so as to transmit a voltage signal output from the detection PCB 10 to the stator coil 7.

标号7a表示对着永磁体5从定子6径向突出形成的定子极。Reference numeral 7a denotes a stator pole formed radially protruding from the stator 6 against the permanent magnet 5 .

下面说明如此构成的现有外转子型BLDC电动机的工作。The operation of the conventional outer rotor type BLDC motor thus constituted will be described below.

首先，当电源加到电动机上时，由被在设在定子6上的定子线圈7环绕的定子铁心8产生磁场。First, when power is applied to the motor, a magnetic field is generated by the stator core 8 surrounded by the stator coil 7 provided on the stator 6 .

由于该磁场，使面对定子铁心8的转子2转动。Due to this magnetic field, the rotor 2 facing the stator core 8 rotates.

同时，由在外转子2上以交替的顺序设有磁极的位置检测永磁体5发生磁场。该霍耳效应传感器9位于磁体5上而位于PCB 10之下，检测由位置检测永磁体5发生的磁场及把所检测的位置值传给检测PCB10，由此，将转子2的所检测的位置值传给定子6。Simultaneously, a magnetic field is generated by the position detecting permanent magnets 5 provided with magnetic poles in alternating order on the outer rotor 2 . The Hall effect sensor 9 is located on the magnet 5 and under the PCB 10, detects the magnetic field generated by the position detection permanent magnet 5 and transmits the detected position value to the detection PCB 10, thereby, the detected position of the rotor 2 The value is passed to stator 6.

霍耳效应传感器9沿着定子6的圆周位于一个固定位置，以使由霍耳效应传感器9所检测的信号指示转子2相对于定子6的位置。The Hall effect sensor 9 is located at a fixed position along the circumference of the stator 6 such that the signal detected by the Hall effect sensor 9 is indicative of the position of the rotor 2 relative to the stator 6 .

但是，在现有的外转子型BLDC电动机中，由于控制向定子6供给电流的霍耳效应传感器9设在检测PCB 10的下表面上，该检测PCB 10以悬臂梁的形式由支柱13固定到定子6上，因而，当由于从固定在转子2内部的定子6传递出振动而使电动机的圆周与霍耳效应传感器9之间的角度变得偏离正常状态时，信号噪声被加到电动机控制电路中，而损害电动机的效率。However, in the existing outer rotor type BLDC motor, since the Hall effect sensor 9 that controls the supply of current to the stator 6 is provided on the lower surface of the detection PCB 10, the detection PCB 10 is fixed by the pillar 13 to the bottom surface of the detection PCB 10 in the form of a cantilever beam. On the stator 6, thus, when the angle between the circumference of the motor and the Hall effect sensor 9 becomes deviated from normal due to vibrations transmitted from the stator 6 fixed inside the rotor 2, signal noise is added to the motor control circuit , which impairs the efficiency of the motor.

而且，由于定子6的振动而缩短了检测PCB 10的寿命，并且，焊接在检测PCB 10上的传感器导线11容易被损坏。Also, the life of the detection PCB 10 is shortened due to the vibration of the stator 6, and the sensor wires 11 welded on the detection PCB 10 are easily damaged.

还有，由于用于发生检测转子的位置值所需磁场的附加位置检测永磁体5必须同设在转子2中的永磁体4相配合，由此而产生了复杂的组装过程和不希望的成本上升。Also, since the additional position detecting permanent magnet 5 for generating the magnetic field required for detecting the position value of the rotor must cooperate with the permanent magnet 4 provided in the rotor 2, a complicated assembly process and undesirable costs are generated rise.

因此，本发明的目的是提供一种外转子型BLDC电动机，配合传感器外壳并在定子极片之间固定位置检测传感器单元，由此而获得减少的组装时间、成本降低并改善的产品可靠性。Accordingly, an object of the present invention is to provide an outer rotor type BLDC motor fitting a sensor housing and fixing a position detection sensor unit between stator pole pieces, thereby achieving reduced assembly time, cost reduction and improved product reliability.

为了达到上述目的，根据本发明所提供的一种外转子型BLDC电动机，包括：一个可旋转地装在其中部的转轴；一个沿着电动机的外周设置并以其一端部同心地联结在转轴的一个端部上以便于同转轴一起旋转的转子；一个设在转子的外周内部并具有排列在其上的永磁体的转子铁心；一个固定在转轴与转子之间的定子；多个分别绕制了设在定子外周内的定子绕组并处于面对永磁体的位置上的定子铁心；以及一个嵌入固定到形成在多个定子铁心的各个端部上的定子极片之间的空间中的检测单元。In order to achieve the above object, an outer rotor type BLDC motor provided according to the present invention includes: a rotating shaft rotatably installed in the middle; A rotor on one end so as to rotate together with the shaft; a rotor core set inside the outer circumference of the rotor and having permanent magnets arranged thereon; a stator fixed between the shaft and the rotor; a stator core provided with a stator winding inside the outer periphery of the stator and at a position facing the permanent magnet; and a detection unit embedded and fixed in a space between stator pole pieces formed on respective ends of the plurality of stator cores.

图1是现有的外转子型BLDC电动机的平面图；FIG. 1 is a plan view of an existing outer rotor type BLDC motor;

图2是现有的外转子型BLDC电动机的截面图；2 is a cross-sectional view of a conventional outer rotor type BLDC motor;

图3是表示现有的外转子型BLDC电动机的检测单元的部分截面图；3 is a partial sectional view showing a detection unit of a conventional outer rotor type BLDC motor;

图4A是根据本发明的外转子型BLDC电动机的平面图；4A is a plan view of an outer rotor type BLDC motor according to the present invention;

图4B是图4A中的部分IVb的放大示图；Figure 4B is an enlarged view of part IVb in Figure 4A;

图5是根据本发明的外转子型BLDC电动机的截面图；5 is a sectional view of an outer rotor type BLDC motor according to the present invention;

图6是表示根据本发明的外转子型BLDC电动机的检测单元的部分截面图；6 is a partial sectional view showing a detection unit of an outer rotor type BLDC motor according to the present invention;

图7是根据本发明的检测单元的一个PCB的简要平面图。Fig. 7 is a schematic plan view of a PCB of the detection unit according to the present invention.

下面将参照附图来说明根据本发明的外转子型BLDC电动机的构成、工作和效果。The configuration, operation and effect of the outer rotor type BLDC motor according to the present invention will be described below with reference to the accompanying drawings.

首先，如图4A所示的那样，根据本发明的外转子型BLDC电动机包括一个可旋转地装在其中心的用于发出转矩的转轴21。参照图4B和5，沿着电动机的外周设置的外转子22从其一端同心地联结在转轴21的一个端部上，以便于同旋转的转轴21一起旋转。First, as shown in FIG. 4A, the outer rotor type BLDC motor according to the present invention includes a rotating shaft 21 rotatably mounted at the center thereof for generating torque. Referring to FIGS. 4B and 5 , an outer rotor 22 disposed along the periphery of the motor is concentrically coupled from one end thereof to one end of a rotating shaft 21 so as to rotate together with the rotating shaft 21 .

在转子22的内周中设有转子铁心23和排列在转子铁心23上的永磁磁体24。In the inner periphery of the rotor 22 are provided a rotor core 23 and permanent magnets 24 arranged on the rotor core 23 .

在转轴21与转子22之间设置定子25，沿着定子25的外周设有多个有定子线圈26绕在其上的定子铁心27。A stator 25 is provided between the rotating shaft 21 and the rotor 22 , and a plurality of stator cores 27 around which stator coils 26 are wound are provided along the outer periphery of the stator 25 .

永磁磁体24与定子线圈26相互面对。The permanent magnets 24 and the stator coils 26 face each other.

如图5、6所示的那样，一个检测单元28被嵌入固定在形成在多个定子铁心27的各个端部上的定子极片之间，以便于当转子22转动时检测转子22的转动位置。As shown in FIGS. 5 and 6, a detection unit 28 is embedded and fixed between stator pole pieces formed on respective ends of a plurality of stator cores 27, so as to detect the rotational position of the rotor 22 when the rotor 22 rotates. .

下面将说明该检测单元28的组成部件和结构。The constituent parts and structure of the detection unit 28 will be described below.

在具有一个开口对着与其相对的边缘部并在其中接收了一个印刷电路板(PCB)31的边缘部的印刷电路板插槽的传感器外壳32的一个边缘部上，形成一个端子外壳32A，用于在其中安装一个在PCB 31的端部突出形成的输出端子部31A，该PCB 31将被固定联结到一个外部连接器上。On one edge portion of the sensor case 32 having an opening facing the opposite edge portion and receiving therein a printed circuit board (PCB) 31 edge portion of the sensor case 32, a terminal case 32A is formed for To install therein an output terminal portion 31A protrudingly formed at the end of the PCB 31 to be fixedly coupled to an external connector.

具有PCB插槽32b的外壳32被弯曲以适合于定子25的曲率，以使被插入其中的PCB 31的边缘部能够被容易地弯曲，而PCB 31的相对边缘部被分成多条，以使如图7所示的那样形成多个由开口31b隔开的伸出臂31c，以便于沿着一个确定的半径弯曲。根据由永磁磁体24产生的磁场的大小和方向而发生的电压信号的霍耳传感器30被装在面对永磁磁体24的其表面上的每个臂31c的外端部上。The housing 32 having the PCB slot 32b is bent to fit the curvature of the stator 25, so that the edge portion of the PCB 31 inserted therein can be easily bent, and the opposite edge portion of the PCB 31 is divided into strips so that, as A plurality of projecting arms 31c separated by openings 31b are formed as shown in FIG. 7 so as to bend along a certain radius. A hall sensor 30 generating a voltage signal according to the magnitude and direction of the magnetic field generated by the permanent magnet 24 is mounted on the outer end of each arm 31 c on its surface facing the permanent magnet 24 .

在图7中，标号31d代表PCB 31的圆角，在图6中，标号32c代表用于引导和支撑将要沿着一个确定的半径弯曲的PCB 31的传感器外壳32的一个PCB支撑。In Fig. 7, reference numeral 31d represents the fillet of PCB 31, and in Fig. 6, reference numeral 32c represents a PCB support for guiding and supporting the sensor housing 32 of the PCB 31 that will be bent along a certain radius.

因而，通过PCB 31，一电压被加给霍耳传感器30，由霍耳传感器30发生的电压信号从形成在该PCB中的输出端31A输出。Thus, a voltage is applied to the Hall sensor 30 through the PCB 31, and a voltage signal generated by the Hall sensor 30 is output from the output terminal 31A formed in the PCB.

如图4B所示的那样，PCB 31被插入并稳定地固定在定子极片29之间的各个空间中，从而通过各个臂31c和定子极片29的相对应的内凸缘29a而在绕制在定子铁心27的外周上的定子线圈26的径向最外部分26a之间产生闭合关系。As shown in FIG. 4B, the PCB 31 is inserted and stably fixed in each space between the stator pole pieces 29, so that the winding is carried out by each arm 31c and the corresponding inner flange 29a of the stator pole piece 29. A closed relationship is created between the radially outermost portions 26 a of the stator coil 26 on the outer circumference of the stator core 27 .

对于如此构成本发明的工作和效果，如图4至7所示的那样，当电源加到电动机上时，由绕制在定子25的定子铁心27上的定子线圈26产生磁场，以使具有面对定子铁心27的转子铁心23和永磁磁体24的转子22与转轴21一起转动。For the work and effect of the present invention thus constituted, as shown in FIGS. The rotor core 23 to the stator core 27 and the rotor 22 of the permanent magnets 24 rotate together with the rotating shaft 21 .

同时，霍耳传感器30检测由安装在转子22中的永磁磁体24发生的磁场，由此，把检测值传给PCB 31，从而由霍耳传感器30所检测的信号被发给定子驱动电路(未示出)，当霍耳转子22转动时，而检测到转子22的转动位置。At the same time, the Hall sensor 30 detects the magnetic field generated by the permanent magnet 24 installed in the rotor 22, thereby passing the detection value to the PCB 31, so that the signal detected by the Hall sensor 30 is sent to the stator driving circuit ( not shown), when the Hall rotor 22 rotates, the rotational position of the rotor 22 is detected.

如上述的那样，当具有霍耳传感器的印刷电路板被插入具有高强度并固定在定子极片之间的传感器外壳中时，其就不会受到定子的振动的影响，从而就能改善霍耳传感器的检测效果，也获得了印刷电路板的延长了的寿命和加强了的检测特性。As described above, when the printed circuit board with the Hall sensor is inserted into the sensor case having high strength and fixed between the stator pole pieces, it is not affected by the vibration of the stator, thereby improving the Hall effect. The sensing effect of the sensor is also achieved with an extended life of the printed circuit board and enhanced sensing characteristics.

进而，检测PCB的输出端部被直接插入传感器外壳的连接器外壳中，而在转子上不需要附加的位置检测永磁体，由此，获得组装时间的缩短、成本的降低和产品可靠性的改善。Furthermore, the output end of the detection PCB is directly inserted into the connector housing of the sensor housing without requiring an additional position detection permanent magnet on the rotor, thereby achieving shortened assembly time, reduced cost and improved product reliability .

Claims (6)

1. an outer-rotor brushless direct current (BLDC) motor is characterized in that this motor comprises:
A rotating shaft that rotatably is mounted in it the heart;
One along the periphery setting of motor and be bound up on one heart with the one end on the end of rotating shaft so that with rotating shaft rotor rotated together;
A rotor core that is located at the periphery inside of rotor and has arrangement permanent magnet thereon;
A stator that is fixed between rotating shaft and the rotor;
A plurality of coilings respectively be located at the periphery internal stator winding of stator and be in locational stator core in the face of permanent magnet; And
Embedding is fixed to the detecting unit in the space between the stator pole piece on each end that is formed on a plurality of stator cores.
2. outer-rotor brushless direct current according to claim 1 (BLDC) motor is characterized in that detecting unit comprises:
One has Hall sensor and dress printed circuit board (PCB) (PCB) thereon; With
A sensor outer housing has out the slot to the PCB of its support portion, and the edge part of this PCB is inserted into this groove.
3. outer-rotor brushless direct current according to claim 2 (BLDC) motor is characterized in that, the terminal shell with the output on the end that is formed on this PCB is formed on the end of sensor outer housing.
4. outer-rotor brushless direct current according to claim 2 (BLDC) motor is characterized in that, the printed circuit board (PCB) slot is bent to be suitable for stator, and this PCB can be curved and have predetermined radius thus.
5. outer-rotor brushless direct current according to claim 2 (BLDC) motor is characterized in that, another edge part of this PCB comprises: a plurality of arms that separated by opening are divided into many and along a definite diameter bending therefrom; With a Hall sensor, be contained on the most external of each arm so that in the face of permanent magnet.
6. outer-rotor brushless direct current according to claim 5 (BLDC) motor, it is characterized in that, each arm is inserted in the suitable space that is fixed between a plurality of stator pole pieces, and carries out tight fit between the inward flange of outermost portion that is wound on the stator coil in the stator core and stator pole piece.
CN97100865A 1996-03-15 1997-03-14 Outer rotor type brushless DC(BLDC) motor Expired - Fee Related CN1068469C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR7061/96 1996-03-15
KR1019960007061A KR100196696B1 (en) 1996-03-15 1996-03-15 Brushless motor
KR7061/1996 1996-03-15

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Publication Number Publication Date
CN1160303A true CN1160303A (en) 1997-09-24
CN1068469C CN1068469C (en) 2001-07-11

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Application Number Title Priority Date Filing Date
CN97100865A Expired - Fee Related CN1068469C (en) 1996-03-15 1997-03-14 Outer rotor type brushless DC(BLDC) motor

Country Status (3)

Country Link
KR (1) KR100196696B1 (en)
CN (1) CN1068469C (en)
IN (1) IN192453B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102201719A (en) * 2010-12-22 2011-09-28 胡景威 Production method of outer rotor type brushless DC (direct current) motor for model airplane
US8292575B2 (en) 2004-04-09 2012-10-23 Lg Electronics Inc. Fan for air conditioner

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8292575B2 (en) 2004-04-09 2012-10-23 Lg Electronics Inc. Fan for air conditioner
US8545193B2 (en) 2004-04-09 2013-10-01 Lg Electronics Inc. Fan for air conditioner
CN102201719A (en) * 2010-12-22 2011-09-28 胡景威 Production method of outer rotor type brushless DC (direct current) motor for model airplane
CN102201719B (en) * 2010-12-22 2016-06-01 胡景威 The production method of brshless DC motor is turned outside a kind of model plane

Also Published As

Publication number Publication date
KR970068098A (en) 1997-10-13
CN1068469C (en) 2001-07-11
IN192453B (en) 2004-04-24
KR100196696B1 (en) 1999-06-15

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