WO2010124573A1

WO2010124573A1 - Magnetically conductive ring

Info

Publication number: WO2010124573A1
Application number: PCT/CN2010/071942
Authority: WO
Inventors: 郝双晖; 郝明晖
Original assignee: 浙江关西电机有限公司
Priority date: 2009-04-30
Filing date: 2010-04-20
Publication date: 2010-11-04
Also published as: CN101877267A; CN101877267B

Abstract

A magnetically conductive ring is provided, which consists of two or more arc segments with same radius and center, the adjacent arc segments are provided with an air gap. The homogeneous distribution of the magnetic field inside the magnetically conductive ring, the minor flux leakage, the integral type signal inducted by the magnetic field sensitive component, the small signal noise and the component ingredient of the contained ultraharmonics and the improved original signal quality and the signal noise ratio can be achieved through adopting this structure of the magnetically conductive ring. Also, there is no strict requirements to the mechanical dimension of the magnetic field sensitive component and the wider types can be chosen, even the follow-up amplifying circuit can be omitted. So this structure is benefit to the reduced product cost and raised cost performance ratio.

Description

导磁环技术领域 Magnetic flux ring

本发明涉及一种磁性元件，具体地说，涉及一种导磁环。背景技术 The present invention relates to a magnetic element, and in particular to a magnetically permeable ring. Background technique

在电机控制领域中应用的位置检测装置主要是编码器，所述编码器一种是将电机旋转角位置、角速度等物理量转换为电信号的位置传感器，编码器的制造以及信号处理水平直接影响到自动化水平。 The position detecting device applied in the field of motor control is mainly an encoder, and the encoder is a position sensor that converts a physical quantity such as a rotational angular position and an angular velocity of the motor into an electrical signal, and the manufacture of the encoder and the level of signal processing directly affect The level of automation.

目前，工程技术领域中应用的编码器主要是光电式编码器，光电式编码器有增量式和绝对式两种。在增量式编码器中，轴旋转时带动光栅盘旋转，发光元件发出的光被光栅盘的狭缝切割成断续光线，再由接收元件接受并输出相应的脉冲信号，旋转方向和脉冲数量需要借助判向电路和计数器来实现。计数起点可任意设定，旋转增量编码器转动时输出脉冲，通过计数设备的内部存储单元来记住位置。然而该编码器工作过程中不允许有干扰进而丢失脉冲，否则，记数设备记忆的零点就会偏移并且无从知道。 At present, the encoders used in the field of engineering technology are mainly photoelectric encoders, and the photoelectric encoders are available in both incremental and absolute modes. In the incremental encoder, when the axis rotates, the grating disk rotates, and the light emitted by the light-emitting element is cut into intermittent light by the slit of the grating disk, and then the receiving component receives and outputs a corresponding pulse signal, the direction of rotation and the number of pulses. It needs to be implemented by means of a decision circuit and a counter. The starting point of the counting can be set arbitrarily. When the rotary incremental encoder rotates, the pulse is output, and the position is memorized by the internal storage unit of the counting device. However, during the operation of the encoder, no interference is allowed and the pulse is lost. Otherwise, the zero point remembered by the counting device is offset and is unknown.

为了解决上述问题，出现了绝对式编码器。绝对式编码器输出与位置一一对应的代码，从代码的大小变化能判别出旋转方向和转子当前位置。这样大大提高了抗干扰性以及数据的可靠性，绝对式编码器已经越来越多地应用于各种工业***的角度测量、长度测量以及位置控制。 In order to solve the above problem, an absolute encoder has appeared. The absolute encoder outputs a code that corresponds to the position one by one. The change in the size of the code can determine the direction of rotation and the current position of the rotor. This greatly improves the immunity to interference and the reliability of the data. Absolute encoders have been increasingly used for angle measurement, length measurement and position control in various industrial systems.

然而，光电编码器存在一些难以克服的缺点：光电编码器由玻璃物质通过刻线而成，其抗震动和冲击能力不强，不适用于尘埃、结露等恶劣环境，并且结构和定位组装复杂；刻线间距有极限，要提高分辨率必须增大码盘，从而难以做到小型化；在生产中必须保证很高的装配精度，直接影响到生产效率，最终影响产品成本。 However, there are some insurmountable shortcomings of photoelectric encoders: Photoelectric encoders are made of glass materials by scribe lines, which are not strong against vibration and impact, and are not suitable for harsh environments such as dust and condensation, and complicated in structure and positioning. There is a limit to the line spacing. To increase the resolution, the code wheel must be increased, which makes it difficult to achieve miniaturization. High assembly accuracy must be ensured in production, which directly affects production efficiency and ultimately affects product cost.

为了解决光电编码器中出现的问题，又提出了一种磁电式编码器。传统磁电传感器的定子和转子由纯铁制成，定子上固定有永久磁铁，形成磁路***。定子和转子相对的环形端面上均匀地设有数目相等的齿和槽，转子与主轴固紧，主轴与被测量的转轴连接，主轴带动转子转动，当转子齿和定子齿相对时，气隙最小，磁通最大，当转子齿和定子槽相对时，气隙最大，磁通最小。可以通过例如磁感应传感器的检测磁通的变化，并将该变化转化成电信号脉冲。此类编码器比较多，但测量精度比较低，且只能实现增量输出。 In order to solve the problems occurring in the photoelectric encoder, a magnetoelectric encoder has been proposed. The stator and rotor of the conventional magnetoelectric sensor are made of pure iron, and permanent magnets are fixed on the stator to form a magnetic circuit system. The opposite end faces of the stator and the rotor are uniformly provided with an equal number of teeth and slots, the rotor is fixed to the main shaft, the main shaft is connected with the measured rotating shaft, the main shaft drives the rotor to rotate, and when the rotor teeth and the stator teeth are opposite, the air gap is minimum. The magnetic flux is the largest. When the rotor teeth and the stator slots are opposite, the air gap is the largest and the magnetic flux is the smallest. The change in the magnetic flux can be detected by, for example, a magnetic induction sensor, and the change can be converted into an electrical signal pulse. There are many such encoders, but the measurement accuracy is low, and Only incremental output can be implemented.

例如，专利 CN 200410024190.7公开了一种具有二、三、四、六个传感器的磁电编码器结构，如图 1A-图 1D所示，在该磁电编码器的结构中，磁感应元件釆用表面贴的方式，即在圆环形定子内侧壁布置磁感应元件，进行旋转磁场的感应，然后根据传感器电压值求出旋转角度值。 For example, the patent CN 200410024190.7 discloses a magnetoelectric encoder structure having two, three, four and six sensors, as shown in FIGS. 1A to 1D, in the structure of the magnetoelectric encoder, the surface of the magnetic induction element is used The method of attaching, that is, arranging a magnetic induction element on the inner side wall of the annular stator, sensing the rotating magnetic field, and then determining the rotation angle value based on the sensor voltage value.

然而，上述磁电编码器在物理结构上具有以下缺点： However, the above magnetoelectric encoder has the following disadvantages in physical structure:

定子内侧一般呈圆弧形且光滑，传感器不易安装固定，容易引起定位误差，进而引起信号的相位偏差，使得信号中高次谐波分量大；加工制造工艺复杂，不利于产业化； The inner side of the stator is generally circular and smooth, and the sensor is not easy to install and fix. It is easy to cause positioning error, which causes phase deviation of the signal, which makes the high-order harmonic component of the signal large. The processing and manufacturing process is complicated, which is not conducive to industrialization;

可靠性低，传感器均布于内侧壁，传感器的支持基体必须为柔性体如 FPC等，其与处理本体接触处其抗拉强度不高，容易破裂，增加了加工难度，影响产品的寿命；传感器感应的磁场泄露大，磁场不能得到充分应用，使得信号中噪声大，影响测量精度； The reliability is low, the sensor is evenly distributed on the inner side wall, and the supporting base of the sensor must be a flexible body such as FPC, etc., the tensile strength of the contact with the processing body is not high, and it is easy to be broken, which increases the processing difficulty and affects the life of the product; The induced magnetic field leaks greatly, and the magnetic field cannot be fully applied, which makes the noise in the signal large and affects the measurement accuracy;

要求传感器体积小，使得产品成本比较高。发明内容 The sensor is required to be small in size, resulting in a relatively high product cost. Summary of the invention

本发明要解决的技术问题在于，针对上述现有技术的不足，提出了一种导磁环，能够简化生产工艺，提高信号精度，减少产品成本，提高性价比。 The technical problem to be solved by the present invention is that, in view of the above-mentioned deficiencies of the prior art, a magnetically permeable ring is proposed, which can simplify the production process, improve signal accuracy, reduce product cost, and improve cost performance.

为解决上述技术问题，本发明提出了一种导磁环，所述导磁环由两段或多段同半径、同圆心的弧段构成，相邻两弧段留有缝隙。 In order to solve the above technical problem, the present invention proposes a magnetic conductive ring, which is composed of two or more segments of the same radius and the same center, and gaps are left between the adjacent two arc segments.

进一步地，所述导磁环由两段同半径、同圆心的弧段构成，分别为 1/4弧段和 3/4 弧段；或者，所述的导磁环由三段同半径的弧段构成，分别为 1/3弧段；或者，所述的导磁环由四段同半径的弧段构成，分别为 1/4弧段；或者，所述的导磁环由六段同半径的弧段构成，分别为 1/6弧段。 Further, the magnetic conductive ring is composed of two arc segments of the same radius and the same center, which are respectively a quarter arc segment and a 3/4 arc segment; or, the magnetic conductive ring is composed of three arcs of the same radius The segments are respectively composed of 1/3 arc segments; or, the magnetic conductive ring is composed of four arc segments of the same radius, which are respectively 1/4 arc segments; or, the magnetic conductive ring is composed of six segments of the same radius The arc segments are composed of 1/6 arc segments.

更进一步地，所述的导磁环的弧段端部设有倒角；具体而言，所述倒角为沿轴向或径向或同时沿轴向、径向切削而形成的倒角。 Further, the end portion of the arc of the magnetic flux ring is chamfered; specifically, the chamfer is a chamfer formed by cutting in the axial direction or the radial direction or both in the axial direction and the radial direction.

通过釆用此结构的导磁环，使得导磁环内部磁场分布均匀，泄露小，并且磁感应元件感应的信号为积分型，信号噪声小，所含高次谐波分量成分小，有利于提高原始信号质量，提高信号信噪比。而且，通过导磁环的增加倒角来缩小有效面积，有利于提高磁感应元件表面感应的磁场强度，在一定程度上能减小对永磁体尺寸要求，能减小整个编码器的机械尺寸。另外，采用此结构，对磁感应元件的机械尺寸没有苛刻要求，可选用型号范围宽，甚至是不用采用后续放大电路，有利于减少产品成本，提高性价比。上述结构的导磁环的使用还使得磁感应元件可直接固定在电路板上，无需转接件，有利于提高产品的可靠性。附图说明 By using the magnetic flux ring of this structure, the magnetic field inside the magnetic flux ring is evenly distributed, the leakage is small, and the signal induced by the magnetic induction element is integral, the signal noise is small, and the components of the higher harmonic components are small, which is conducive to improving the original. Signal quality, improve signal to noise ratio. Moreover, the effective area is reduced by increasing the chamfer of the magnetic flux ring, which is beneficial to increase the magnetic field strength induced on the surface of the magnetic induction element, and can reduce the size requirement of the permanent magnet to a certain extent, and can reduce Small mechanical size of the entire encoder. In addition, with this structure, there is no strict requirement on the mechanical size of the magnetic induction element, and the wide range of models can be selected, and even the subsequent amplification circuit is not needed, which is advantageous for reducing product cost and improving cost performance. The use of the magnetically permeable ring of the above structure also enables the magnetic induction element to be directly fixed on the circuit board without the need for an adapter, which is advantageous for improving the reliability of the product. DRAWINGS

图 1A〜图 1D是现有技术中磁电式编码器的结构示意图； 1A to 1D are schematic structural views of a magnetoelectric encoder in the prior art;

图 2 ~图 2D是本发明的导磁环的倒角设计图； 2 to 2D are chamfering design drawings of the magnetic flux guiding ring of the present invention;

图 3是表示设置有本发明的导磁环的磁电式传感器的立体分解图； Figure 3 is an exploded perspective view showing a magnetoelectric sensor provided with a magnetically permeable ring of the present invention;

图 4是本发明的导磁环安装于骨架上的立体图； Figure 4 is a perspective view of the magnetically permeable ring of the present invention mounted on a skeleton;

图 5是本发明的导磁环分为两段时的应用例 1的结构示意图； Figure 5 is a schematic view showing the structure of an application example 1 when the magnetic permeability ring of the present invention is divided into two sections;

图 6是本发明的导磁环分为四段时的应用例 2的结构示意图； 6 is a schematic structural view of an application example 2 when the magnetic permeability ring of the present invention is divided into four segments;

图 7是本发明的导磁环分为三段时的应用例 3的结构示意图； Figure 7 is a schematic view showing the structure of an application example 3 when the magnetically permeable ring of the present invention is divided into three sections;

图 8是本发明的导磁环分为六段时的应用例 4的结构示意图。具体实施方式 Fig. 8 is a view showing the configuration of an application example 4 in which the magnetically permeable ring of the present invention is divided into six segments. detailed description

以下结合附图和具体的实施例对本发明进行详细地说明。 The invention will be described in detail below with reference to the drawings and specific embodiments.

实施例 Example

图 2八~图 2D是本发明的导磁环的倒角设计图。如图 2八~图20所示，导磁环由两段或多段同半径、同圆心的弧段构成，图 2A所示的导磁环没有设计倒角，图 26~图 2D所示的弧段端部设有倒角，所述倒角为沿轴向（图 2B ) 或径向（图 2C ) 或同时沿轴向、径向（图 2D) 切削而形成的倒角， 151、 154表示轴向切面， 152、 153表示径向切面。相邻两弧段间留有缝隙，磁感应元件置于该缝隙内，当磁钢环与导磁环发生相对旋转运动时，所述磁感应元件将感测到的磁信号转换为电压信号，并将该电压信号传输给相应的控制器。 2 to 2D are chamfering designs of the magnetic flux guiding ring of the present invention. As shown in Fig. 2 to Fig. 20, the magnetic flux ring is composed of two or more segments of the same radius and the same center. The magnetic ring shown in Fig. 2A has no chamfer design, and the arc shown in Fig. 26 to Fig. 2D The end portion of the segment is chamfered, and the chamfer is a chamfer formed by cutting in the axial direction (Fig. 2B) or the radial direction (Fig. 2C) or simultaneously in the axial direction and the radial direction (Fig. 2D), and 151, 154 indicate The axial section, 152, 153, represents the radial section. a gap is left between two adjacent arc segments, and a magnetic induction element is placed in the gap. When the magnetic steel ring and the magnetic flux ring rotate relative to each other, the magnetic induction element converts the sensed magnetic signal into a voltage signal, and This voltage signal is transmitted to the corresponding controller.

根据磁密公式 β = 可以知道，当 —定时候，可以通过减少增加 3。因为永磁体产生的磁通是一定的，在导磁环中 S较大，所以 β比较小，因此可以减少因为磁场交变而导致的发热。而导磁环增加的倒角减少了导磁环端部面积，能够增大端部的磁场强度，使得磁感应元件的输出信号增强。这样的信号拾取结构制造工艺简单，拾取的信号噪声小，生产成本低，可靠性高，而且尺寸小。应用例 According to the magnetic density formula β = it can be known that when it is determined, it can be increased by 3 by decreasing. Since the magnetic flux generated by the permanent magnet is constant, S is large in the magnetically permeable ring, so β is relatively small, so that heat generation due to alternating magnetic fields can be reduced. The increased chamfer of the magnetically permeable ring reduces the area of the end of the magnetically permeable ring, and the magnetic field strength of the end portion can be increased, so that the output signal of the magnetic induction element is enhanced. Such a signal pickup structure has a simple manufacturing process, low signal noise picked up, low production cost, high reliability, and small size. Application example

图 3是表示设置有本发明的导磁环的磁电式传感器的立体分解图。图 4是本发明的导磁环安装于骨架上的立体图。如图 3和图 4所示，磁电式传感器由磁感应元件板 102、磁钢环 103、导磁环 104、骨架 105组成；磁感应元件板 102由 PCB板和磁感应元件 106组成，磁感应元件板 102上还装有接插件 108。 Fig. 3 is an exploded perspective view showing a magnetoelectric sensor provided with a magnetic flux guide of the present invention. Fig. 4 is a perspective view showing the magnetic flux ring of the present invention mounted on a skeleton. As shown in FIG. 3 and FIG. 4, the magnetoelectric sensor is composed of a magnetic induction element board 102, a magnetic steel ring 103, a magnetic conductive ring 104, and a skeleton 105. The magnetic induction element board 102 is composed of a PCB board and a magnetic induction element 106, and the magnetic induction element board 102 A connector 108 is also mounted thereon.

磁钢环 103装在电机轴上，导磁环 104固定在骨架 105上，骨架 105固定在电机的合适位置。当电机轴转动时，磁钢环 103转动，产生正弦磁场，而导磁环 104起聚磁作用，磁钢环 103产生的磁通通过导磁环 104。 PCB板上固定的磁感应元件 106把通过导磁环 104的磁场转换成电压信号并输出，该电压信号直接进入主控板芯片。由主控板上芯片对电压信号进行处理，最后得到位角位移。 The magnetic steel ring 103 is mounted on the motor shaft, and the magnetic flux ring 104 is fixed to the bobbin 105, and the bobbin 105 is fixed at a suitable position of the motor. When the motor shaft rotates, the magnetic steel ring 103 rotates to generate a sinusoidal magnetic field, and the magnetic conductive ring 104 acts as a magnetism, and the magnetic flux generated by the magnetic steel ring 103 passes through the magnetic conductive ring 104. The magnetic induction element 106 fixed on the PCB converts the magnetic field passing through the magnetic flux ring 104 into a voltage signal and outputs it, and the voltage signal directly enters the main control board chip. The voltage signal is processed by the chip on the main control board, and finally the angular displacement is obtained.

其中，在制作所述的磁电式传感器时，导磁环 104设置在骨架成型模具上，在所述骨架一体成型时与骨架 105固定在一起。 Wherein, in the production of the magnetoelectric sensor, the magnetic flux ring 104 is disposed on the skeleton forming mold, and is fixed to the skeleton 105 when the skeleton is integrally formed.

应用例 1 Application example 1

图 5是本发明的导磁环分为两段时的应用例 1。如图 5所示，导磁环由两段同半径的弧段构成，分别为 1/4弧段 111和 3/4弧段 112，位置 A和 B相距角度为 90° , 并开有狭缝，两个磁感应元件 109、 110分别放置于 A和 B处的狭缝中，釆用此结构有利于减少磁场泄露，提高磁感应元件感应的磁通量，并且由于磁表面感应的磁通是磁场的积分，因此有利用降低信号噪声以和信号中的高次谐波。至于信号处理的具体过程此处不作详细说明。在电机轴上，由两段同半径的弧段 111、 112构成的导磁环与磁钢环 113同心安装。 Fig. 5 is a view showing an application example 1 in the case where the magnetically permeable ring of the present invention is divided into two sections. As shown in Fig. 5, the magnetic flux ring is composed of two arc segments of the same radius, which are respectively a quarter arc segment 111 and a 3/4 arc segment 112, and the positions A and B are at an angle of 90° and are slit. The two magnetic sensing elements 109, 110 are respectively placed in the slits at A and B. The use of this structure is advantageous for reducing magnetic field leakage, increasing the magnetic flux induced by the magnetic induction element, and since the magnetic flux induced by the magnetic surface is the integral of the magnetic field, Therefore, there is a use of reducing signal noise to neutralize higher harmonics in the signal. The specific process of signal processing is not described in detail here. On the motor shaft, a magnetically permeable ring composed of two arc segments 111, 112 of the same radius is mounted concentrically with the magnetic steel ring 113.

应用例 2 Application example 2

图 6是本发明的导磁环分为四段时的应用例 2。如图 5所示，导磁环由四段同半径的 1/4弧段 118、 119、 120和 121构成， A， B， C， D四个位置角度依次相隔为 90° ，并且都有一狭缝。 4个磁感应元件 114、 115、 116和 117分别放置于狭缝、 B、 C和 D处，采用此结构有利于减少磁场泄露，提高磁感应元件感应的磁通量，并且由于磁表面感应的磁通是磁场的积分，因此有利用降低信号噪声以和信号中的高次谐波。至于信号处理的具体过程此处不作详细说明。四段同半径的 1/4弧段 118、 119、 120和 121构成的导磁环和磁钢环 122同心安装。 Fig. 6 is a second application example 2 when the magnetically permeable ring of the present invention is divided into four sections. As shown in FIG. 5, the magnetic flux ring is composed of four segments of the same radius of 1/4 arc segments 118, 119, 120 and 121, and the four positions A, B, C, and D are sequentially separated by 90 degrees, and each has a narrow Seam. Four magnetic sensing elements 114, 115, 116 and 117 are respectively placed at the slits, B, C and D. This structure is advantageous for reducing magnetic field leakage, increasing the magnetic flux induced by the magnetic induction element, and the magnetic flux induced by the magnetic surface is a magnetic field. The integral, therefore, is utilized to reduce signal noise and harmonics in the signal. The specific process of signal processing is not described in detail here. The four-section 1/4 arc segments 118, 119, 120, and 121 of the same radius are concentrically mounted with the magnetic ring and the magnetic steel ring 122.

应用例 3 Application example 3

图 7是本发明的导磁环分为三段时的应用例 3。如图 7所示，导磁环由三段同半径的 1/3弧段 126、 127和 128构成， A， B , C三个位置依次相距 120° ，并且开有一狭缝， 3个传感器 123、 124和 125分别放置狭缝处，釆用此结构有利于减少磁场泄露，提高传感器感应的磁通量，并且由于传感器表面感应的磁通是磁场的积分，因此有利用降低信号噪声以和信号中的高次谐波。至于信号处理的具体过程此处不作详细说明。三段同半径的 1/3弧段 126、 127和 128构成的导磁环和磁钢环 129同心安装。 Fig. 7 is a third application example 3 when the magnetically permeable ring of the present invention is divided into three sections. As shown in Figure 7, the magnetic flux ring consists of three segments and the same half. The 1/3 arc segments 126, 127 and 128 of the diameter are formed, and the three positions A, B and C are 120° apart from each other, and a slit is opened, and three sensors 123, 124 and 125 are respectively placed at the slits, and this is used. The structure is beneficial for reducing the magnetic field leakage, increasing the magnetic flux induced by the sensor, and since the magnetic flux induced by the sensor surface is the integral of the magnetic field, there is a use of reducing the signal noise to the higher harmonics in the signal. The specific process of signal processing is not described in detail here. The magnetic conductive ring and the magnetic steel ring 129 composed of three segments of the 1/3 arc segments 126, 127 and 128 of the same radius are concentrically mounted.

应用例 4 Application example 4

图 8是本发明的导磁环分为六段时的应用例 4。如图 8所示，导磁环由六段同半径的 1/6弧段 136、 137、 138、 139、 140和 141构成， A, B , C, D， E, F六个位置依次相距 60 ° ，并且都开有一狭缝， 6个传感器 130、 131、 132、 133、 134和 135 分别放置狭缝内，釆用此结构有利于减少磁场泄露，提高传感器感应的磁通量，并且由于传感器表面感应的磁通是磁场的积分，因此有利用降低信号噪声以和信号中的高次谐波。至于信号处理的具体过程此处不作详细说明。电机非负载输出端轴上装有永磁环，由六段同半径的 1/6弧段 136、 137、 138、 139、 140和 141构成的导磁环和磁钢环 142同心安装。 Fig. 8 is a view showing an application example 4 in the case where the magnetically permeable ring of the present invention is divided into six segments. As shown in Fig. 8, the magnetic flux ring is composed of six segments of the same radius 1/6 arc segments 136, 137, 138, 139, 140 and 141, and the six positions A, B, C, D, E, F are 60 degrees apart. °, and both have a slit, and six sensors 130, 131, 132, 133, 134, and 135 are respectively placed in the slits, and the structure is used to reduce magnetic field leakage, increase the magnetic flux induced by the sensor, and sense the surface of the sensor. The magnetic flux is the integral of the magnetic field, so there is a use of lowering the signal noise to sum the higher harmonics in the signal. The specific process of signal processing is not described in detail here. The non-load output end of the motor is provided with a permanent magnet ring, and the magnetic flux ring and the magnetic steel ring 142 composed of six segments of the same radius 1/6 arc segments 136, 137, 138, 139, 140 and 141 are concentrically mounted.

上述四个实施例中的导磁环均可釆用图 2C-2D中的任何一种倒角形式。 The magnetic flux rings of the above four embodiments can be used in any of the chamfered forms of Figs. 2C-2D.

以上参照附图详细描述了本发明的各个实施例，然而本发明并不局限于所述实施例，而是在不脱离权利要求书的范围的情况下，可以做出各种变化和改进。 The various embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the invention is not limited to the embodiments, and various changes and modifications may be made without departing from the scope of the appended claims.

Claims

权利要求书 Claim

1. 一种导磁环，其特征在于，所述导磁环由两段或多段同半径、同圆心的弧段构成，相邻两弧段留有缝隙。 A magnetically permeable ring, characterized in that: the magnetically permeable ring is composed of two or more segments of the same radius and the same center, and the adjacent two arc segments have a gap.

2. 如权利要求 1所述的导磁环，其特征在于，所述导磁环由两段同半径、同圆心的弧段构成，分别为 1/4弧段和 3/4弧段；或者，所述的导磁环由三段同半径的弧段构成，分别为 1/3弧段；或者，所述的导磁环由四段同半径的弧段构成，分别为 1/4弧段；或者，所述的导磁环由六段同半径的弧段构成，分别为 1/6弧段。 2. The magnetic flux ring according to claim 1, wherein the magnetic conductive ring is composed of two arc segments of the same radius and the same center, which are respectively a quarter arc segment and a 3/4 arc segment; or The magnetic conductive ring is composed of three arc segments of the same radius, which are respectively 1/3 arc segments; or, the magnetic conductive ring is composed of four arc segments of the same radius, respectively, which are 1/4 arc segments Or, the magnetic conductive ring is composed of six segments of the same radius, which are respectively 1/6 arc segments.

3. 如权利要求 1或 2所述的导磁环，其特征在于，所述的导磁环的弧段端部设有倒角。 3. A magnetically permeable ring according to claim 1 or 2, characterized in that the end of the arc of the magnetically permeable ring is chamfered.

4. 如权利要求 3所述的导磁环，其特征在于，所述倒角为沿轴向或径向或同时沿轴向、径向切削而形成的倒角。 4. A magnetically permeable ring according to claim 3, wherein the chamfer is a chamfer formed by cutting axially or radially or simultaneously in the axial direction.