TWI724341B - Rotation detection device and encoder and motor using same - Google Patents

Abstract

A rotation detection device includes a magnet, a first magnetic sensing assembly and a second magnetic sensing assembly. The magnet is rotated with a rotation central axis as the axis, and the magnet has a magnetic characteristic with one cycle per revolution of the magnet. The first magnetic sensing assembly is disposed above the rotation central axis, and the first length direction of the first magnetic sensing is parallel to the rotation radius direction of the magnet. The second magnetic sensing assembly is disposed adjacent to the first magnetic sensing assembly, and the second length direction of the second magnetic sensing assembly is parallel to the rotation tangent direction of the magnet. The angle between the second length direction and the first length direction is (90°+θ), and -30°≦θ≦30°. The change in the magnetic characteristic is sensed by the first magnetic sensing assembly and the second magnetic sensing assembly, and the first voltage pulse signal and the second voltage pulse signal are generated, such that the rotation information of the magnet is obtained through simple components and configurations.

Description

Rotation detection device and its applicable encoder and motor

The present invention relates to a rotation detection device, in particular to a first magnetic sensing component and a second magnetic sensing component to sense changes in magnetic characteristics when a magnet rotates and generate a voltage pulse signal to obtain rotation information of the magnet The rotation detection device and its applicable encoder and motor.

Generally speaking, in rotatable devices such as rotary encoders or motors, rotation detectors are often provided to convert mechanical displacement into electronic signals through photoelectric or electromagnetic principles, thereby detecting the number of rotations of the rotatable device Or rotating state.

In the prior art, the structure of the rotation detector includes a magnet and a plurality of magnetic field sensing components. The plurality of magnetic field sensing components are arranged in a tangent manner to the rotation track circle of the magnet, or the phase angle is staggered on the rotation circle of the magnet. The method is configured to detect the change of the magnetic field to obtain the rotation state information.

However, in the conventional rotation detector, the number of components is large and the structure is more complicated, and the arrangement of the magnetic field sensing components requires a large amount of planar space, so that the volume of the rotation detector also increases, occupying It is difficult to miniaturize due to the large space.

Therefore, how to develop a rotation detection device and its applicable encoder and motor to improve the problems and shortcomings in the prior art, which can obtain accurate magnet rotation information through simple components and configuration, and achieve The effect of reducing the occupied space and volume is actually a key issue in the current technical field.

The main purpose of this case is to provide a rotation detection device and its applicable encoder and motor, so as to solve and improve the aforementioned problems and shortcomings of the prior art.

Another object of this case is to provide a rotation detection device and its applicable encoder and motor, by providing a first magnetic sensing component and a second magnetic sensing component, and the first length direction of the first magnetic sensing component is The angle of the second lengthwise included angle of the second magnetic sensing component is 60° to 120°, so that the rotation information of the magnet can be obtained through simple components and configuration, and the effect of reducing the occupied space and miniaturization is achieved.

Another purpose of this case is to provide a rotation detection device and its applicable encoder and motor. Through the first magnetic sensing component, when the rotation angle of the magnet is (90°+θ) and (270°+θ), the first Voltage pulse signal, and the second magnetic sensing element generates a second voltage pulse signal when the rotation angle of the magnet is 0° and 180°, which is analyzed and integrated by the signal processing unit to obtain accurate rotation information of the magnet .

Another purpose of this case is to provide a rotation detection device and its applicable encoder and motor. By integrating with the power adjustment circuit and storage unit, the voltage pulse signal can be used by the power adjustment circuit and the signal processing unit. The rotation information is temporarily stored in the storage unit to achieve rotation detection without additional power.

Another purpose of this case is to provide a rotation detection device and its applicable encoder and motor, which are obtained by combining the single-turn absolute position sensing component with the single-turn absolute position information and the first magnetic sensing component and the second magnetic sensing component. The magnet rotation information obtained by the component is integrated to obtain precise multi-turn absolute position information.

In order to achieve the above objective, a preferred implementation aspect of the present case is to provide a rotation detection device, which includes: a magnet that rotates about a central axis of rotation as an axis, and the magnet has a magnetic characteristic, wherein the magnetic characteristic One cycle of the magnet is one rotation; a first magnetic sensing component is arranged above the rotation center axis, wherein a first length direction of the first magnetic sensing component is connected to one of the magnet The direction of the radius of rotation is parallel; and a second magnetic sensing component is adjacent to the first magnetic sensing component, wherein a second length direction of the second magnetic sensing component is parallel to a rotation tangential direction of the magnet , And the angle between the second length direction and the first length direction is (90°+θ), where -30°≦θ≦30°; wherein, the first magnetic sensing component is used when the magnet rotates Sensing the change of the magnetic characteristic and generating a first voltage pulse signal, and the second magnetic sensing component senses the change of the magnetic characteristic when the magnet rotates and generates a second voltage pulse signal, To obtain the rotation information of one of the magnets.

In order to achieve the above objective, another preferred embodiment of the present application is to provide an encoder, which includes: a carrier plate; a magnet arranged on the carrier plate, and the magnet has a magnetic characteristic, wherein the magnetic characteristic Each rotation of the magnet is regarded as a cycle; and a code disc is arranged on the carrying disc and is arranged on the magnet, wherein the carrying disc, the code disc and the magnet are based on a central axis of rotation The axis is set and rotated coaxially; a single-turn absolute position sensing component is set corresponding to the code wheel and the magnet to sense and generate a single-turn absolute position signal when the code wheel and the magnet rotate; The first magnetic sensing component is arranged above the rotation center axis, wherein a first length direction of the first magnetic sensing component is parallel to a rotation radius direction of the magnet; and a second magnetic sensing component , Is adjacent to the first magnetic sensing component, wherein a second length direction of the second magnetic sensing component is parallel to a rotation tangential direction of the magnet, and the second length direction is parallel to the first length direction The angle of the included angle is (90°+θ), where -30°≦θ≦30°; wherein, the first magnetic sensing component senses the change of the magnetic characteristics when the magnet rotates and generates a first A voltage pulse signal, and the second magnetic sensing component senses the change of the magnetic characteristic when the magnet rotates and generates a second voltage pulse signal to obtain rotation information of the magnet.

In order to achieve the above objective, another preferred embodiment of the present application is to provide a motor, including: a frame; a rotating shaft passing through the frame and having a rotating central shaft; a rotor part, and a sleeve Is provided on the rotating shaft; a stator part is provided on the frame and corresponds to the rotor part; a bearing plate is provided on the rotating shaft; a magnet is provided on the bearing plate, and the magnet has a Magnetic characteristics, wherein the magnetic characteristics are based on each rotation of the magnet as a cycle; and a code disc is arranged on the carrier disc, and is arranged on the magnet, wherein the carrier disc, the code disc and The magnet is arranged and rotated coaxially with the central axis of rotation as the axis; a single-turn absolute position sensing component is set corresponding to the code disc and the magnet, so as to sense and rotate when the code disc and the magnet rotate A single-turn absolute position signal is generated; a first magnetic sensing component is arranged above the rotation center axis, wherein a first length direction of the first magnetic sensing component is parallel to a rotation radius direction of the magnet And a second magnetic sensing component, which is adjacent to the first magnetic sensing component, wherein a second length direction of the second magnetic sensing component is parallel to a rotation tangential direction of the magnet, and the first The angle between the two length directions and the first length direction is (90°+θ), where -30°≦θ≦30°; wherein, the first magnetic sensing component senses the magnetic field when the magnet rotates. The change of the gas characteristic generates a first voltage pulse signal, and the second magnetic sensing component senses the change of the magnetic characteristic when the magnet rotates and generates a second voltage pulse signal to obtain the magnet One of the rotating information.

Some typical embodiments embodying the features and advantages of this case will be described in detail in the following description. It should be understood that this case can have various changes in different aspects, which do not depart from the scope of this case, and the descriptions and illustrations therein are essentially for illustrative purposes, rather than being constructed to limit the case.

Please refer to Fig. 1A, Fig. 1B, Fig. 2 and Fig. 3. Fig. 1A shows a top view of the rotation detection device of the preferred embodiment of this case, and Fig. 1B shows the rotation detection device of the preferred embodiment of this case The side view, Figure 2 shows the top view of the magnet of the rotation detection device of the preferred embodiment of the present case and its corresponding side view, and Figure 3 shows the top view of the magnet of the rotation detection device of another preferred embodiment of the present case The view and its corresponding side view, wherein the upper and side views of Fig. 2 and Fig. 3 are drawn with corresponding dashed lines. As shown in Fig. 1A, Fig. 1B, Fig. 2 and Fig. 3, the rotation detection device 1 of the preferred embodiment of the present invention includes a magnet 10, a first magnetic sensing component 11, and a second magnetic sensing component 12. The first magnetic sensing component 11 and the second magnetic sensing component 12 are arranged in the thickness direction z of the magnet 10. The magnet 10 is rotated about the central axis of rotation C as the axis, and the magnet 10 has a magnetic characteristic. The magnetic characteristic takes one revolution of the magnet 10 as a period, and the magnetic characteristic may include magnetic flux density or Magnetic field strength. The magnet 10 can be, for example, but not limited to, a hollow ring magnet, a disc-shaped magnet, a rectangular magnet, or any magnet with a change in the magnetic characteristics of one rotation and one cycle. In some embodiments, as shown in FIG. 2, the magnet 10 is magnetized radially in the direction of the radius of rotation r. In some embodiments, as shown in FIG. 3, the magnet 10 is magnetized in the axial direction in the thickness direction z of the magnet, but it is not limited thereto.

The first magnetic sensing element 11 is disposed above the rotation center axis C, wherein the first length direction L1 of the first magnetic sensing element 11 is parallel to the rotation radius direction r of the magnet 10. The second magnetic sensing element 12 is adjacent to the first magnetic sensing element 11, wherein the second longitudinal direction L2 of the second magnetic sensing element 12 is parallel to the rotation tangential direction t of the magnet 10, and the second longitudinal direction L2 The angle α with the first longitudinal direction L1 is (90°+θ), where -30°≦θ≦30°. Wherein, the first length direction L1 is the extension of the first magnetic sensing component 11 along its own length, and the second length direction L2 is the extension of the second magnetic sensing component 12 along its own length. The radius of rotation The direction r is the radial direction when the magnet 10 rotates with the rotation center axis C as the axis, and the rotation tangent direction t is the tangent direction when the magnet 10 rotates with the rotation center axis C as the axis.

The first magnetic sensing component 11 senses the change in the magnetic characteristics of the magnet 10 and generates a first voltage pulse signal when the magnet 10 rotates about the central axis of rotation C as the axis, and the second magnetic sensing component 12 is connected to When the magnet 10 rotates around the central axis of rotation C as its axis, it senses the change in the magnetic characteristics of the magnet 10 and generates a second voltage pulse signal, so as to obtain the rotation information of the magnet 10 through the processing of the back-end circuit and signal. The rotation information includes information on the number of rotations and the direction of rotation of the magnet 10.

In some embodiments, the first magnetic sensing component 11 has a central axis A along the first length direction L1, the first magnetic sensing component 11 is disposed above the rotation center axis C of the magnet 10, and the central axis A passes through the rotation center The extension of the axis C refers to any position on the extension line of the central axis of rotation C, and is not limited to the physical part. In some embodiments, the second magnetic sensing element 12 has a central point M, and the extension of the central axis A of the first magnetic sensing element 11 passes through the central point M of the second magnetic sensing element 12, where the central axis A Extension refers to any position on the extension line of the central axis A, and is not limited to the physical part. In some embodiments, the first magnetic sensing element 11 and the second magnetic sensing element 12 are in a T-like configuration. In some embodiments, the angle α between the second longitudinal direction L2 of the second magnetic sensing element 12 and the first longitudinal direction L1 of the first magnetic sensing element 11 is 90°, that is, θ=0°, and The two length directions L2 are perpendicular to the first length direction L1. In this way, more precise rotation information can be obtained through a more precise alignment configuration, but it is not limited to this.

The first magnetic sensing component 11 and the second magnetic sensing component 12 are composed of magnetic elements and coils that can produce the Barkhausen effect, such as Wiegand wire, composite magnetic wire, and amorphous wire. wire) and so on. The Barkhausen effect refers to the phenomenon that the magnetization direction of the magnetic element is suddenly reversed when the applied external magnetic field exceeds a certain strength, which is also called the Barkhausen jump. When the first magnetic sensing component 11 and the second magnetic sensing component 12 experience changes in the magnetic characteristics (such as magnetic flux density or magnetic field strength) of the magnet 10, they will produce a large Barkhausen jump phenomenon, thereby reducing The change of the magnetic characteristics is converted into the output of the relevant voltage pulse signal. This signal output contains the rotation information of the magnet 10, which can be analyzed by the back-end circuit and signal processing to obtain the information of the number of rotations and the rotation direction of the magnet 10 .

According to the concept of the present case, when the magnet 10 of the rotation detection device 1 rotates one circle with the rotation center axis C as the axis, the rotation angle of the first magnetic sensing component 11 on the magnet 10 is (90°+θ) and (270° +θ) generates the first voltage pulse signal, and the second magnetic sensing element 12 generates the second voltage pulse signal when the rotation angle of the magnet 10 is 0° and 180°. In some embodiments, the magnetic characteristics of the magnet 10 include the magnetic flux density. When the magnet 10 rotates about the central axis of rotation C as the axis, the rotation angle of the first magnetic sensing component 11 on the magnet 10 is (90 °+θ) and (270°+θ) when the direction of the magnetic flux density changes, and the second magnetic sensing element 12 senses the magnetic flux when the rotation angle of the magnet 10 is 0° and 180° The direction of flux changes.

The following embodiments are performed with the angle α between the second longitudinal direction L2 of the second magnetic sensing element 12 and the first longitudinal direction L1 of the first magnetic sensing element 11 being 90°, that is, θ=0° Further details. However, when the angle α between the second longitudinal direction L2 and the first longitudinal direction L1 is (90°+θ) (-30°≦θ≦30°), a similar effect can be obtained, and this is not the case. limit.

Please refer to Fig. 4A, Fig. 4B, Fig. 4C and Fig. 4D. Fig. 4A is a schematic top view showing the magnetic flux density distribution when the rotation angle of the magnet of the rotation detection device of the preferred embodiment of the present invention is 0°. Figure 4B is a schematic top view showing the magnetic flux density distribution when the rotation angle of the magnet of the rotation detection device of the preferred embodiment of this project is 90°, and Figure 4C shows the rotation of the magnet of the rotation detection device of the preferred embodiment of this project The top view schematic diagram of the magnetic flux density distribution when the angle is 180°, and the 4D diagram shows the top view schematic diagram of the magnetic flux density distribution when the rotation angle of the magnet of the rotation detection device of the preferred embodiment of the present invention is 270°. Figures 4A, 4B, 4C, and 4D define the horizontal direction as the x-axis and the vertical direction as the y-axis. When the rotation angle of the magnet 10 is 0° and 180°, as shown in FIGS. 4A and 4C, the magnetic flux density distribution line felt by the central part of the second magnetic sensing element 12 is in line with the second longitudinal direction L2 The magnetic flux density distribution line is symmetrical as it extends in the +y direction and the -y direction. Therefore, the overall second magnetic sensing component 12 senses the magnetic flux density value over its length Is 0. When the rotation angle of the magnet 10 is 90°, as shown in FIG. 4B, the second magnetic sensing element 12 senses the maximum magnetic flux density value By from its length, and its direction is the -y direction. When the rotation angle of the magnet 10 is 270°, as shown in FIG. 4D, the second magnetic sensing element 12 senses the maximum magnetic flux density By over its length, and its direction is the +y direction.

Please refer to Figure 5A and Figure 5B, where Figure 5A shows the magnetic flux density value map in the length direction of the second magnetic sensing component when the magnet is rotating in this case, or the length-magnetic flux density value map, and Fig. 5B shows the corresponding graph of the magnetic flux density value in another longitudinal direction of the second magnetic sensing element when the magnet is rotating in this case. As shown in Figures 5A and 5B, when the rotation angle of the magnet 10 is 0° and 180°, the distribution of the magnetic flux density is based on the center point M of the second magnetic sensing component 12 (that is, the length in the figure is 10mm) presents positive and negative symmetry, so the magnetic flux density value sensed by the entire second magnetic sensing component 12 over its own length is 0. When the rotation angle of the magnet 10 is 90°, the second magnetic sensing element 12 senses the maximum negative magnetic flux density value over its own length. When the rotation angle of the magnet is 270°, the second magnetic sensing element 12 senses the maximum positive magnetic flux density value over its own length.

That is, when the magnet 10 rotates in a clockwise direction, the rotation angle of the magnet 10 sequentially passes through 0°, 90°, 180°, and 270°, and finally returns to 0° (or 360°). The magnetic flux density sensed by the second magnetic sensing component 12 in its length direction is 0, -By, 0, and +By in order, and finally returns to 0. Therefore, the magnet 10 rotates one circle in a clockwise direction, and the second magnetic sensing component 12 will feel the change of the direction of the magnetic flux density when the rotation angle of the magnet 10 is 0° (or 360°) and 180°, and then generate the first The output of the two voltage pulses is shown in Fig. 6A. Fig. 6A shows the voltage-rotation angle correspondence diagram of the second voltage pulse signal of the second magnetic sensing component when the magnet rotates clockwise in this case.

Please refer to Fig. 6B. Fig. 6B shows the voltage-rotation angle correspondence diagram of the second voltage pulse signal of the second magnetic sensing element when the magnet rotates counterclockwise in this case. As shown in Fig. 6B, similarly, when the magnet 10 rotates in a counterclockwise direction, the second magnetic sensing component 12 also feels the magnetic flux density at the rotation angle of 0° (or 360°) and 180°, respectively. The direction is changed, and the output of the second voltage pulse signal is generated. When the magnet 10 rotates counterclockwise, the positive and negative directions of the magnetic flux density change are opposite to those of the magnet 10 when the magnet 10 rotates clockwise. Therefore, the direction of the second voltage pulse output shown in Figure 6B is the same as that of the 6A The figure is opposite. At the same time, since the second magnetic sensing element 12 itself has a hysteresis effect, the pulse wave position will be slightly shifted, and this shift can be corrected by the signal processing at the back end.

Please refer to Fig. 7A and Fig. 7B, in conjunction with Fig. 4B and Fig. 4D, Fig. 7A shows the magnetic flux density distribution when the rotation angle of the magnet of the rotation detection device of the preferred embodiment of this case is 0°. The schematic diagram and Figure 7B are a schematic side view showing the magnetic flux density distribution when the rotation angle of the magnet of the rotation detection device of the preferred embodiment of the present invention is 180°, in which the horizontal direction is defined in Figures 7A and 7B Is the x-axis, and the vertical direction is the magnet thickness direction z. When the rotation angle of the magnet 10 is 0°, as shown in FIG. 7A, the first magnetic sensing element 11 senses the maximum magnetic flux density value Bx along its length, and its direction is the +x direction. When the rotation angle of the magnet 10 is 180°, as shown in FIG. 7B, the first magnetic sensing element 11 senses the maximum magnetic flux density value Bx along its length, and its direction is the -x direction. When the rotation angle of the magnet 10 is 90° and 270°, as shown in Fig. 4B and Fig. 4D, the magnetic flux density distribution line sensed by the first magnetic sensing element 11 is roughly perpendicular to its own length. The value of the magnetic flux density sensed by a magnetic sensing component 11 over its own length is zero.

Please refer to Figure 8A and Figure 8B. Figure 8A shows the corresponding diagram of the magnetic flux density value in the longitudinal direction of the first magnetic sensing element when the magnet is rotating in this case, and Figure 8B shows the first magnetic flux density value when the magnet is rotating in this case. Corresponding graph of the magnetic flux density value in the other length direction of a magnetic sensing component. As shown in FIGS. 8A and 8B, when the rotation angle of the magnet 10 is 90° and 270°, the magnetic flux density value sensed by the first magnetic sensing element 11 over its length is 0. When the rotation angle of the magnet 10 is 0°, the first magnetic sensing element 11 senses the maximum positive magnetic flux density value along its length. When the rotation angle of the magnet 10 is 180°, the first magnetic sensing element 11 senses the maximum negative magnetic flux density value over its length.

That is, when the magnet 10 rotates in a clockwise direction, the rotation angle of the magnet 10 sequentially passes through 0°, 90°, 180°, and 270°, and finally returns to 0° (or 360°). The magnetic flux density sensed in the length direction of the first magnetic sensing element 11 is Bx, 0, -Bx, and 0 in order, and finally returns to Bx. Therefore, when the magnet 10 rotates in a clockwise direction, the first magnetic sensing component 11 will feel the change of the direction of the magnetic flux density when the rotation angle of the magnet 10 is 90° and 270°, and then generate the first voltage pulse. The output is shown in Fig. 9A, where Fig. 9A shows the voltage-rotation angle correspondence diagram of the first voltage pulse signal of the first magnetic sensing element when the magnet rotates clockwise in this case.

Please refer to Fig. 9B. Fig. 9B shows the voltage-rotation angle correspondence diagram of the first voltage pulse signal of the first magnetic sensing element when the magnet rotates counterclockwise in this case. As shown in Figure 9B, similarly, when the magnet 10 rotates in a counterclockwise direction, the first magnetic sensing component 11 also feels the direction of the magnetic flux density at the rotation angles of 90° and 270°, respectively, and Generate the output of the first voltage pulse. When the magnet 10 rotates counterclockwise, the positive and negative directions of the magnetic flux density change are opposite to those of the magnet 10 when the magnet 10 rotates clockwise. Therefore, the direction of the first voltage pulse output shown in Figure 9B is the same as that of the 9A The figure is opposite. At the same time, since the first magnetic sensing element 11 itself has a hysteresis effect, the pulse wave position will be slightly shifted, and this shift can be corrected by the signal processing at the back end.

In summary of the above embodiments, when the magnet 10 of the rotation detection device 1 rotates one revolution with the rotation center axis C as the axis, the first magnetic sensing component 11 generates the first voltage at the rotation angle of the magnet 10 at 90° and 270° The output of the pulse wave signal. The second magnetic sensing element 12 generates the output of the second voltage pulse signal when the rotation angle of the magnet 10 is 0° (or 360°) and 180°. The first magnetic sensing element 11 The voltage pulse signal output from the second magnetic sensing component 12 is sequentially different by 90°. These signals contain the rotation information of the magnet 10, and the information about the number of rotations and the rotation direction of the magnet 10 can be parsed by the back-end circuit and signal processing.

In other words, the rotation detection device provided in this case is provided by the first magnetic sensing element and the second magnetic sensing element, and the first length direction of the first magnetic sensing element and the second length of the second magnetic sensing element The angle of the direction is from 60° to 120°, so that the rotation information of the magnet can be obtained through simple components and configuration, and the effect of reducing the occupied space and miniaturization is achieved. Moreover, the first voltage pulse signal is generated when the rotation angle of the magnet is (90°+θ) and (270°+θ) through the first magnetic sensing element, and the rotation angle of the second magnetic sensing element on the magnet is The second voltage pulse signal is generated at 0° and 180°, which is analyzed and integrated by the signal processing unit to obtain accurate rotation information of the magnet.

Please refer to FIG. 1A, FIG. 1B and FIG. 10. FIG. 10 is a block diagram showing the structure of the rotation detection device according to another preferred embodiment of the present application. As shown in Figures 1A, 1B, and 10, the rotation detection device 1 further includes a signal processing unit 13, which is connected to the first magnetic sensing component 11 and the second magnetic sensing component 12, and receives and analyzes The first voltage pulse signal generated by the first magnetic sensing component 11 and the second voltage pulse signal generated by the second magnetic sensing component 12 are used to obtain the rotation information of the magnet 10.

In some embodiments, the rotation detection device 1 further includes a power adjustment circuit 14 and a storage unit 15. The power adjustment circuit 14 is connected to the first magnetic sensing component 11, the second magnetic sensing component 12, and the signal processing unit 13. To receive the first voltage pulse signal and the second voltage pulse signal and perform power adjustment. The storage unit 15 is connected to the signal processing unit 13 and the power adjustment circuit 14. The power adjustment circuit 14 supplies power to the signal processing unit 13 and the storage unit 15, and the storage unit 15 receives and stores the rotation information transmitted by the signal processing unit 13 .

For example, the first voltage pulse signal and the second voltage pulse signal generated by the first magnetic sensing element 11 and the second magnetic sensing element 12 are provided to the power regulating circuit 14, and the power regulating circuit 14 After the voltage pulse signal and the second voltage pulse signal are adjusted, power is provided to the signal processing unit 13 and the storage unit 15. The signal processing unit 13 receives the power supplied from the power adjustment circuit 14 and the first voltage pulse signal and the second voltage pulse signal from the first magnetic sensing component 11 and the second magnetic sensing component 12, and then processes the signal And parse out the rotation information of the magnet 10, and provide the rotation information of the magnet 10 to the storage unit 15. The storage unit 15 receives the power supplied from the power adjustment circuit 14 and writes the rotation information of the magnet 10 provided by the signal processing unit into the storage unit 15. In some embodiments, the storage unit 15 is a non-volatile storage unit. When there is no external power, the rotation information of the magnet 10 can be stored in the storage unit 15, and the rotation information will be provided when the external power is supplied again. Read to the signal processing unit 13. In this way, the rotation detection device 1 can achieve rotation detection without external power (for example, without external battery or external power supply).

In other words, the rotation detection device provided in this case is integrated with the power adjustment circuit and the storage unit to provide the voltage pulse signal to the power adjustment circuit and the signal processing unit for use, and the rotation information can be temporarily stored in the storage unit to achieve Rotation detection without additional power.

According to the concept of this case, the rotation detection device can be further integrated with a single-turn absolute encoder to form a multi-turn absolute encoder. Please refer to FIG. 11, where FIG. 11 is a cross-sectional structure diagram of an encoder applicable to the rotation detection device of the preferred embodiment of the present application. As shown in FIG. 11, the encoder 2 includes a carrier disk 20, a magnet 21, a code disk 22, a single-turn absolute position sensing component 23, a first magnetic sensing component 24 and a second magnetic sensing component 25. The magnet 21 is disposed on the carrier plate 20, and the magnet 21 has a magnetic characteristic, and the magnetic characteristic is that each rotation of the magnet 21 is a cycle. The code disc 22 is arranged on the carrier disc 20, and the code disc 22 is annularly arranged on the magnet 21, wherein the carrier disc 20, the code disc 22 and the magnet 21 are arranged and rotated coaxially with the rotation center axis C as the axis. The single-turn absolute position sensing component 23 is set corresponding to the code disk 22 and the magnet 21 to sense when the code disk 22 and the magnet 21 rotate, and generate a single-turn absolute position signal. The first magnetic sensing element 24 and the second magnetic sensing element 25 can be arranged above the single-turn absolute position sensing element 23, and the change in the magnetic characteristics of the magnet 21 is sensed when the magnet 21 rotates and generates a first The voltage pulse signal and the second voltage pulse signal. In addition, the arrangement relationship between the first magnetic sensing component 24 and the second magnetic sensing component 25 and the magnet 21 of the encoder 2 is the same as that of the first magnetic sensing component 11 and the second magnetic sensing component 11 of the aforementioned rotation detection device 1. The configuration relationship between the sensing component 12 and the magnet 10 has been described in detail before, so it will not be repeated here.

The encoder 2 further includes a signal processing unit, which is connected to the single-turn absolute position sensing component 23, the first magnetic sensing component 24 and the second magnetic sensing component 25. The signal processing unit receives and integrates the single-turn absolute position signal to obtain the single-turn absolute position information θ _ST , where θ _ST is a mechanical angle between 0° and 360°. And the signal processing unit receives and integrates the first voltage pulse signal and the second voltage pulse signal to obtain the rotation information N of the magnet, where N is the number of rotations. The final signal processing unit receives and integrates single-turn absolute position information θ _ST and rotation information N to obtain multi-turn absolute position information θ _MT , where θ _MT =θ _ST +N*360°.

In some embodiments, the encoder 2 further includes a power adjustment circuit and a storage unit. The structure of the signal processing unit, the power adjustment circuit, and the storage unit is the same as the signal processing unit 13, the power adjustment circuit 14 and the storage unit shown in Figure 10. Unit 15 is similar. Therefore, the encoder 2 can store the rotation information of the magnet 21 (such as the number of turns information N) in the storage unit without applying external power, and then provide the number of turns information N to the signal processing unit when the external power is supplied again. Read and integrate with single-turn absolute position information θ _ST . In this way, the encoder 2 can achieve the rotation detection function without external power.

In some embodiments, the encoder 2 is an optical reflective structure, and the single-turn absolute position information can be generated by at least one absolute position pattern on the code wheel and at least one absolute position light-receiving area of the light-receiving element, or from The magnetic angle sensor (angle sensor) is produced with a magnet, but it is not limited to this. In addition, the rotation detection device in this case can also be combined with various single-turn absolute encoder architectures such as optical transmissive architecture or magnetic sensing architecture to integrate a multi-turn absolute encoder.

According to the concept of this case, the multi-turn absolute encoder composed of the rotation detection device and the single-turn absolute encoder can be directly built-in inside the motor, which can minimize the space size. Please refer to FIG. 12, where FIG. 12 is a schematic diagram showing the cross-sectional structure of the motor to which the rotation detection device of the preferred embodiment of the present application is applicable. As shown in Figure 12, the motor 3 includes a frame 30, a rotating shaft 31, a rotor portion 32, a stator portion 33, a carrier plate 34, a magnet 35, an encoder plate 36, a single-turn absolute position sensing assembly 37, and a first magnet The sensing component 38 and the second magnetic sensing component 39. The rotating shaft 31 passes through the frame 30 and has a central axis of rotation C, the rotor part 32 is sleeved on the rotating shaft 31, the stator part 33 is arranged on the frame 30 and corresponds to the rotor part 32, and the bearing plate 34 is Set on the rotating shaft 31. In addition, the connection and configuration of the carrier plate 34, the magnet 35, the code plate 36, the single-turn absolute position sensing component 37, the first magnetic sensing component 38 and the second magnetic sensing component 39 of the motor 3 are the same as described above The connection and configuration of the carrier disk 20, the magnet 21, the code disk 22, the single-turn absolute position sensing component 23, the first magnetic sensing component 24 and the second magnetic sensing component 25 of the encoder 2 have been carried out before Detailed description, so I won't repeat it here.

In some embodiments, the motor 3 further includes a signal processing unit, a power adjustment circuit, and a storage unit. The signal processing unit is associated with a single-turn absolute position sensing component 37, a first magnetic sensing component 38, and a second magnetic sensing component 39 The structure of the signal processing unit, the power adjustment circuit and the storage unit is similar to the signal processing unit 13, the power adjustment circuit 14 and the storage unit 15 shown in FIG. 10. Therefore, the motor 3 can store the rotation information of the magnet 35 (such as lap information N) in the storage unit without applying external power, and then provide the lap information N to the signal processing unit for reading when the external power is supplied again. And integrate with the absolute position information θ _{ST of the} single lap. In this way, the motor 3 can achieve the rotation detection function without external power.

In other words, the rotation detection device and its applicable encoder and motor provided in this case are the single-turn absolute position information obtained by the single-turn absolute position sensing component, as well as the first magnetic sensing component and the second magnetic sensing component. The magnet rotation information obtained by the measuring component is integrated to obtain precise multi-turn absolute position information.

In summary, this case provides a rotation detection device and its applicable encoder and motor, by arranging a first magnetic sensing component and a second magnetic sensing component, and the first longitudinal direction of the first magnetic sensing component The angle between the second longitudinal direction of the second magnetic sensing component and the angle is 60° to 120°, so that the rotation information of the magnet can be obtained through simple components and configuration, and the effect of reducing the occupied space and miniaturization is achieved. At the same time, the first voltage pulse signal is generated when the rotation angle of the magnet is (90°+θ) and (270°+θ) through the first magnetic sensing element, and the rotation angle of the second magnetic sensing element on the magnet is The second voltage pulse signal is generated at 0° and 180°, which is analyzed and integrated by the signal processing unit to obtain accurate rotation information of the magnet. Moreover, by integrating with the power adjustment circuit and the storage unit, the voltage pulse signal is provided to the power adjustment circuit and the signal processing unit for use, and the rotation information can be temporarily stored in the storage unit to achieve rotation detection without additional power. In addition, by integrating the single-turn absolute position information obtained by the single-turn absolute position sensing component and the magnet rotation information obtained by the first magnetic sensing component and the second magnetic sensing component to obtain fine multi-turn absolute position information .

Even though this case has been described in detail by the above-mentioned embodiments and can be modified in many ways by those who are familiar with the art, it does not deviate from the protection of the scope of the attached patent application.

1: Rotation detection device 10, 21, 35: Magnet 11, 24, 38: First magnetic sensing component 12, 25, 39: Second magnetic sensing component 13: Signal processing unit 14: Power adjustment circuit 15: Storage unit 2: Encoder 20, 34: Carrier disc 22, 36: Code disc 23, 37: Single-turn absolute position sensing assembly 3: Motor 30: Frame 31: Rotating shaft 32: Rotor part 33: Stator part C: Rotation center Axis z: magnet thickness direction r: rotation radius direction t: rotation tangent direction L1: first length direction L2: second length direction α: included angle A: central axis M: center point x: horizontal direction y: vertical direction

Figure 1A is a top view of the rotation detection device of the preferred embodiment of the present invention. Figure 1B is a side view of the rotation detection device of the preferred embodiment of the present invention. Figure 2 shows the top view of the magnet of the rotation detection device of the preferred embodiment of the present invention and its corresponding side view. Fig. 3 shows a top view of the magnet of the rotation detection device of another preferred embodiment of the present invention and its corresponding side view. Fig. 4A is a schematic top view showing the magnetic flux density distribution when the rotation angle of the magnet of the rotation detection device of the preferred embodiment of the present application is 0°. FIG. 4B is a schematic top view showing the magnetic flux density distribution when the rotation angle of the magnet of the rotation detection device of the preferred embodiment of the present application is 90°. Fig. 4C is a schematic top view showing the magnetic flux density distribution when the rotation angle of the magnet of the rotation detecting device of the preferred embodiment of the present application is 180°. Fig. 4D is a schematic top view showing the magnetic flux density distribution when the rotation angle of the magnet of the rotation detection device of the preferred embodiment of the present application is 270°. Figure 5A shows the corresponding figure of the magnetic flux density value in the longitudinal direction of the second magnetic sensing component when the magnet is rotating in this case. Fig. 5B shows the corresponding graph of the magnetic flux density value in another longitudinal direction of the second magnetic sensing element when the magnet is rotating in this case. Fig. 6A shows the voltage-rotation angle correspondence diagram of the second voltage pulse signal of the second magnetic sensing element when the magnet rotates clockwise in this case. Fig. 6B is a diagram showing the voltage-rotation angle correspondence of the second voltage pulse signal of the second magnetic sensing element when the magnet rotates counterclockwise in this case. FIG. 7A is a schematic side view showing the magnetic flux density distribution when the rotation angle of the magnet of the rotation detection device of the preferred embodiment of the present application is 0°. FIG. 7B is a schematic side view showing the magnetic flux density distribution when the rotation angle of the magnet of the rotation detection device of the preferred embodiment of the present application is 180°. Figure 8A shows the corresponding figure of the magnetic flux density value in the longitudinal direction of the first magnetic sensing element when the magnet is rotating in this case. Fig. 8B shows the corresponding graph of the magnetic flux density value in another longitudinal direction of the first magnetic sensing element when the magnet is rotating in this case. Fig. 9A shows the voltage-rotation angle correspondence diagram of the first voltage pulse signal of the first magnetic sensing element when the magnet is rotated clockwise in this case. Fig. 9B is a diagram showing the voltage-rotation angle correspondence of the first voltage pulse signal of the first magnetic sensing element when the magnet rotates counterclockwise in this case. Fig. 10 is a block diagram showing the structure of the rotation detecting device of another preferred embodiment of the present invention. Fig. 11 is a schematic diagram showing the cross-sectional structure of the encoder applicable to the rotation detection device of the preferred embodiment of the present invention. Figure 12 is a schematic diagram showing the cross-sectional structure of the motor to which the rotation detection device of the preferred embodiment of the present invention is applicable.

1: Rotation detection device

10: Magnet

11: The first magnetic sensing component

12: The second magnetic sensing component

C: Rotation center axis

r: the direction of the radius of rotation

t: Rotation tangent direction

L1: first length direction

L2: second length direction

α: included angle

A: Bottom axis

M: center point

Claims (13)

A rotation detection device includes: a magnet that rotates around a central axis of rotation, and the magnet has a magnetic characteristic, wherein the magnetic characteristic is that each revolution of the magnet is a cycle; a first a magnetic sensing element, disposed above the central line of the axis of rotation, wherein the first magnetic sensing element and the assembly has a magnetic coil generating a large Barkhausen effect, the magnetic sensing one of the first components of the first longitudinal direction line Parallel to the direction of a radius of rotation of the magnet; and a second magnetic sensing component adjacent to the first magnetic sensing component, wherein the second magnetic sensing component has a magnetic element that produces a large Barkhausen effect and Coil, a second length direction of the second magnetic sensing component is parallel to a rotation tangential direction of the magnet, wherein the rotation tangent direction is perpendicular to the rotation radius direction, and the second length direction is parallel to the first length The angle of the direction is (90°+θ), where -30°≦θ≦30°; wherein, the first magnetic sensing component senses the change of the magnetic characteristics when the magnet rotates and generates a first A voltage pulse signal, and the second magnetic sensing component senses the change of the magnetic characteristics when the magnet rotates and generates a second voltage pulse signal to obtain a rotation information of the magnet; wherein, the The first magnetic sensing component has a center axis along the first length direction, and the center axis system extends through the rotation center axis. The second magnetic sensing component has a center point, wherein the center point is the second A center of the magnetic sensing component, and the extension of the central axis passes through the center point; wherein the length of the first magnetic sensing component in the first longitudinal direction is greater than the length of the magnet in the rotation radius direction, The length of the second magnetic sensing component in the second length direction is greater than the length of the magnet in the rotation radius direction. The rotation detection device described in the first item of the scope of patent application, wherein when the magnet rotates one circle with the rotation center axis as the axis, the first magnetic sensing component is connected to the magnet with a rotation angle of (90°+ θ) and (270°+θ) generate the first voltage pulse signal, and the second magnetic sensing element generates the second voltage pulse signal when the rotation angle is 0° and 180°. For the rotation detection device described in item 1 of the scope of patent application, the magnetic characteristic includes a magnetic flux density. When the magnet rotates around the rotation center axis as its axis, the first magnetic sensing component is attached to When one of the rotation angles of the magnet is (90°+θ) and (270°+θ), the direction change of the magnetic flux density is sensed, and the second magnetic sensing element is set when the rotation angle is 0° and 180° ° when the direction of the magnetic flux density is sensed to change. The rotation detection device described in the first item of the scope of patent application further includes a signal processing unit, which is connected to the first magnetic sensing component and the second magnetic sensing component, and receives and analyzes the first voltage pulse The wave signal and the second voltage pulse signal are used to obtain the rotation information. For example, the rotation detection device described in item 4 of the scope of patent application further includes: a power adjustment circuit connected to the first magnetic sensing component, the second magnetic sensing component and the signal processing unit to receive the The first voltage pulse signal and the second voltage pulse signal and perform power adjustment; and a storage unit connected to the signal processing unit and the power adjustment circuit; Wherein, the power adjustment circuit supplies power to the signal processing unit and the storage unit, and the storage unit receives and stores the rotation information transmitted by the signal processing unit. The rotation detection device described in the first item of the scope of patent application, wherein θ=0°, and the second length direction is perpendicular to the first length direction. The rotation detection device described in the first item of the scope of patent application, wherein the magnet is magnetized radially in the direction of the rotation radius. The rotation detection device described in the first item of the scope of patent application, wherein the magnet is axially magnetized in a thickness direction of the magnet. An encoder includes: a carrier disk; a magnet arranged on the carrier disk, and the magnet has a magnetic characteristic, wherein each rotation of the magnet is a cycle; and an encoder disk , Is set on the carrier plate, and the ring is set on the magnet, wherein the carrier plate, the code plate and the magnet are coaxially arranged and rotated with a central axis of rotation as the axis; a single-turn absolute position sensing assembly , Is set corresponding to the code disk and the magnet to sense and generate a single-turn absolute position signal when the code disk and the magnet rotate; a first magnetic sensing component is set above the rotation center axis , Wherein the first magnetic sensing component has a magnetic element and a coil that produce a large Barkhausen effect, a first length direction of the first magnetic sensing component is parallel to a rotation radius direction of the magnet; and a second The magnetic sensing component is arranged adjacent to the first magnetic sensing component, wherein the second magnetic sensing component has a magnetic element and a coil that produce a large Barkhausen effect, and the second magnetic A second length direction of the sensing component is parallel to a rotation tangent direction of the magnet, wherein the rotation tangent direction is perpendicular to the rotation radius direction, and the angle between the second length direction and the first length direction is (90°+θ), where -30°≦θ≦30°; wherein, the first magnetic sensing component senses the change of the magnetic characteristics when the magnet rotates and generates a first voltage pulse signal, And the second magnetic sensing element senses the change of the magnetic characteristics when the magnet rotates and generates a second voltage pulse signal to obtain a rotation information of the magnet; wherein, the first magnetic sensing element A central axis is provided along the first length direction, and the central axis system extends through the central axis of rotation. The second magnetic sensing component has a central point, wherein the central point is a part of the second magnetic sensing component. Center, and the extension of the central axis passes through the center point; wherein, the length of the first magnetic sensing component in the first length direction is greater than the length of the magnet in the rotation radius direction, and the second magnetic sensing component The length of the component in the second length direction is greater than the length of the magnet in the rotation radius direction. For example, the encoder described in item 9 of the scope of patent application further includes a signal processing unit connected to the single-turn absolute position sensing component, the first magnetic sensing component, and the second magnetic sensing component to Receive and integrate the single-turn absolute position signal and the rotation information to obtain one-turn absolute position information. For example, the encoder described in item 10 of the scope of patent application further includes: a power adjustment circuit connected to the first magnetic sensing component, the second magnetic sensing component, and the signal processing unit to receive the first magnetic sensing component, the second magnetic sensing component, and the signal processing unit. A voltage pulse signal and the second voltage pulse signal and perform power adjustment; and A storage unit is connected to the signal processing unit and the power adjustment circuit; wherein, the power adjustment circuit supplies power to the signal processing unit and the storage unit, and the storage unit receives and stores the signals transmitted by the signal processing unit The rotation information. A motor includes: a frame body; a rotating shaft, which penetrates the frame body and has a rotating central shaft; a rotor part, which is sleeved on the rotating shaft; a stator part, which is arranged on the frame body And corresponds to the rotor part; a bearing plate is arranged on the rotating shaft; a magnet is arranged on the bearing plate, and the magnet has a magnetic characteristic, wherein the magnetic characteristic is based on the fact that every time the magnet rotates The circle is a cycle; and a code disc is arranged on the carrying disc and the ring is arranged on the magnet, wherein the carrying disc, the code disc and the magnet are arranged and rotated coaxially with the rotation center axis as the axis ; A single-turn absolute position sensing component is set corresponding to the code disk and the magnet to sense and generate a single-turn absolute position signal when the code disk and the magnet rotate; a first magnetic sensing component, Is arranged above the central axis of rotation, wherein the first magnetic sensing component has a magnetic element and a coil that produce a large Barkhausen effect, and a first length direction of the first magnetic sensing component is connected to one of the magnets The direction of the radius of rotation is parallel; and a second magnetic sensing component is adjacent to the first magnetic sensing component, wherein the second magnetic sensing component has a magnetic element and a coil that produce a large Barkhausen effect, and the second A second length direction of the magnetic sensing component is parallel to a rotation tangential direction of the magnet, which Wherein, the rotation tangent direction is perpendicular to the rotation radius direction, and the angle between the second length direction and the first length direction is (90°+θ), where -30°≦θ≦30°; wherein, the The first magnetic sensing component senses the change of the magnetic characteristic when the magnet is rotating and generates a first voltage pulse signal, and the second magnetic sensing component senses the magnetic characteristic when the magnet is rotating And generate a second voltage pulse signal to obtain a rotation information of the magnet; wherein, the first magnetic sensing component has a center axis along the first length direction, and the center axis passes through the rotation center axis The extension of the second magnetic sensing component has a center point, wherein the center point is a center of the second magnetic sensing component, and the extension of the central axis passes through the center point; wherein, the first magnetic sensing component The length of the measuring component in the first length direction is greater than the length of the magnet in the direction of the rotation radius, and the length of the second magnetic sensing component in the second length direction is greater than the length of the magnet in the rotation radius direction length. For example, the motor described in item 12 of the scope of patent application further includes: a signal processing unit connected to the single-turn absolute position sensing component, the first magnetic sensing component, and the second magnetic sensing component to Receive and integrate the single-turn absolute position signal and the rotation information to obtain a multi-turn absolute position information; a power adjustment circuit is connected to the first magnetic sensing component, the second magnetic sensing component and the signal processing unit Are connected to each other to receive the first voltage pulse signal and the second voltage pulse signal and perform power adjustment; and a storage unit is connected to the signal processing unit and the power adjustment circuit; Wherein, the power adjustment circuit supplies power to the signal processing unit and the storage unit, and the storage unit receives and stores the rotation information transmitted by the signal processing unit.

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