CN114614630A - Magnetic encoder and electronic device having the same - Google Patents
Magnetic encoder and electronic device having the same Download PDFInfo
- Publication number
- CN114614630A CN114614630A CN202011411918.7A CN202011411918A CN114614630A CN 114614630 A CN114614630 A CN 114614630A CN 202011411918 A CN202011411918 A CN 202011411918A CN 114614630 A CN114614630 A CN 114614630A
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- Prior art keywords
- magnetic
- motor
- magnetic ring
- encoder
- ring
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- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The invention provides a magnetic encoder and an electronic device with the same, wherein the magnetic encoder is connected with a motor; the magnetic encoder includes: the magnetic ring is sleeved on the motor; the induction unit is axially arranged in parallel with the motor; and the magnetic sensitive element corresponding to the magnetic ring is arranged on the sensing unit. The invention solves the problem of deviation caused by the non-concentricity of the magnetic sensing element and the magnetic ring in the prior art, ensures the consistent amplitude of the magnetic sensing element and the fixed phase difference, and improves the assembly precision and the installation efficiency. In addition, the PCB and the motor rotating shaft which are vertically installed manually are modified into the induction unit and the motor rotating shaft which are arranged in parallel, so that the installation requirement and difficulty are reduced, and the deviation caused by concentric installation is eliminated.
Description
Technical Field
The invention belongs to the technical field of encoders, relates to an encoder, and particularly relates to a magnetic encoder and electronic equipment with the magnetic encoder.
Background
The encoder is one of the key components of a micro special motor (the diameter of the micro special motor is less than 160mm, the rated power of the micro special motor is less than 750W, or the micro special motor has special performance and special purpose), and is mainly used for measuring the rotating speed of the micro special motor so as to ensure the stable work of the micro special motor.
The encoder generally includes an electronic component, a magnetic ring and a bracket, wherein the electronic component is used for data processing, the magnetic ring is sleeved on an output shaft of the micro and special motor and is used for measuring the rotating speed of the micro and special motor, and the bracket plays a role in supporting the electronic component and connecting the electronic component to the micro and special motor.
However, when the magnetoelectric conversion element needs to be installed, the magnetoelectric conversion element needs to be positioned manually in welding assembly, so that the included angle and the orientation angle between the elements are inconsistent, and the performance of the encoder is inconsistent. Meanwhile, the PCB assembly and the motor rotating shaft are required to be concentric when being vertically installed, and the mode has high requirements on processing and assembling precision, so that the batch production is difficult.
Therefore, how to provide a magnetic encoder and an electronic device having the same to solve the problem of high requirements for processing and assembling precision in the prior art has become a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide a magnetic encoder and an electronic device having the same, for solving the problem that in the prior art, when a magnetoelectric conversion element needs to be mounted, the magnetoelectric conversion element needs to be accurately positioned manually during welding and assembling, which easily causes inconsistency of an included angle and an orientation angle between the elements and causes inconsistency of encoder performance; and meanwhile, the motor rotating shaft is required to be concentric when the PCB assembly is installed, namely, the requirements on processing and assembling precision are high, and the problem of difficult batch production is caused.
To achieve the above and other related objects, an aspect of the present invention provides a magnetic encoder, comprising: the magnetic ring is sleeved on the motor; the induction unit is axially arranged in parallel with the motor; and the magnetic sensing element corresponding to the magnetic ring is arranged on the sensing unit.
In an embodiment of the invention, the induction unit is installed inside a concentric arc of the rear end cover of the motor.
In an embodiment of the present invention, the magnetic ring is a radial magnetizing magnetic ring; the magnetic ring is divided into one layer or a plurality of layers.
In an embodiment of the invention, each layer of the magnetic ring is composed of a single pair of magnetic poles or a plurality of pairs of magnetic poles.
In an embodiment of the invention, the number of the magnetic sensing elements corresponding to each layer of the magnetic ring is at least one.
In an embodiment of the invention, when the number of the magnetic sensing elements corresponding to the magnetic ring is two or more, the phase difference between two adjacent magnetic sensing elements is 90 °.
In an embodiment of the present invention, a distance D between two adjacent magneto-sensitive elements is 2 × R × sin (β); and beta is 90 degrees/2N, N is the pole pair number of the magnetic ring, and R is the distance from the center of the magnetic ring to the induction area of the magnetic sensitive element.
In an embodiment of the invention, the sensing unit is a chip die or a PCB.
In an embodiment of the present invention, the magnetic encoder further includes: the processing unit is connected with the magnetic sensing element; and the power supply unit is connected with the processing unit.
Another aspect of the present invention provides an electronic device, including: the magnetic encoder; the motor is connected with the magnetic encoder; and the motor driver is respectively connected with the magnetic encoder and the motor.
As described above, the magnetic encoder and the electronic device having the same according to the present invention have the following advantageous effects:
the magnetic encoder solves the problem of deviation caused by the fact that the magneto-sensitive element and the magnetic ring are not concentric in the prior art, guarantees the consistency of the amplitude values of the magneto-sensitive element and the fixed phase difference, and improves the assembly precision and the installation efficiency. In addition, the PCB and the motor rotating shaft which are vertically installed manually are modified into the induction unit and the motor rotating shaft which are arranged in parallel, so that the installation requirement and difficulty are reduced, and the deviation caused by concentric installation is eliminated. The magnetic-sensing elements correspond to a layer of magnetic ring, so that the position detection precision of magnetic codes can be improved.
Drawings
FIG. 1 is a schematic perspective view of a magnetic encoder according to an embodiment of the present invention.
FIG. 2 is a schematic top view of a magnetic encoder according to the present invention.
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the invention.
Description of the element reference numerals
1 magnetic encoder
11 magnetic ring
12 sensing unit
13 magnetic sensitive element
2 electric machine
3 electronic device
31 magnetic encoder
32 electric machine
33 Motor driver
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, etc. shown in the drawings and attached to the description are only for understanding and reading the disclosure of the present invention, and are not intended to limit the practical conditions of the present invention, so that the present invention has no technical significance, and any modifications of the structures, changes of the ratio relationships, or adjustments of the sizes, should still fall within the scope of the technical contents of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Example one
The embodiment provides a magnetic encoder, which is connected with a motor; the magnetic encoder includes:
the magnetic ring is sleeved on the motor;
the induction unit is axially arranged in parallel with the motor;
and the magnetic sensitive element corresponding to the magnetic ring is arranged on the induction unit.
The magnetic encoder provided in the present embodiment will be described in detail with reference to the drawings. Referring to fig. 1, a schematic perspective view of a magnetic encoder in an embodiment is shown. As shown in fig. 1, the magnetic encoder 1 includes a magnetic ring 11, an induction unit 12, and at least one magnetic sensor 13.
The magnetic encoder 1 of the present embodiment is connected to a motor 2.
As shown in fig. 1, two layers of the magnetic rings 11 are sleeved on the motor 2 in a stacked manner, that is, the magnetic rings 11 may be sleeved on the motor 2 in a one-layer manner or in a multi-layer manner. Each layer of magnetic ring 11 is composed of a pair of magnetic poles or a plurality of pairs of magnetic poles, wherein a single pair of magnetic poles means that the layer of magnetic ring only comprises a pair of N poles and S poles, and a plurality of pairs of magnetic poles means that the layer of magnetic ring comprises a plurality of pairs of N poles and S poles.
As an embodiment, when the magnetic ring 11 is sleeved on the motor 2 in a layer manner, the interior of the magnetic ring can be divided into multiple layers of magnetic rings, which are only seen as one body in appearance. As another embodiment, when the magnetic ring 11 is sleeved on the motor 2 in a layer manner, only one layer of magnetic ring may be inside the magnetic ring. When the magnetic ring 11 is sleeved on the motor 2 in a multi-layer manner, as shown in fig. 1, the magnetic ring 11 is divided into an upper magnetic ring and a lower magnetic ring. One embodiment of the magnetic ring 11 is that the upper magnetic ring can be a single pair of magnetic poles, and the lower magnetic ring can be a plurality of pairs of magnetic poles; in another embodiment of the magnetic ring 11, both the upper magnetic ring and the lower magnetic ring are single pairs of magnetic poles; in another embodiment of the magnetic ring 11, the upper magnetic ring and the lower magnetic ring are both provided with a plurality of pairs of magnetic poles.
Each layer of magnetic ring is provided with a corresponding magnetic sensitive element, and the height of the magnetic sensitive element (namely the axial direction of the motor) does not protrude out of the lower surface of the layer of magnetic ring and does not protrude out of the upper surface of the layer of magnetic ring, namely, the minimum number of the magnetic sensitive elements is the number of the layers of the magnetic ring, so that the magnetic field intensity of each layer of the magnetic ring can be detected. For example: in fig. 1, the number of the magnetic ring layers is 2, and the number of the corresponding magneto-sensitive elements is at least 2; in fig. 1, 2 magnetosensitive elements correspond to the lower magnetic ring, and 1 magnetosensitive element corresponds to the upper magnetic ring.
In this embodiment, the magnetic ring 11 is a radial magnetizing magnetic ring.
The induction unit 12 is arranged in parallel with the motor in the axial direction as a carrier of the magnetic sensing element 13. In this embodiment, the sensing unit 12 is a chip die or a PCB.
Specifically, the induction unit 12 is installed inside a concentric arc of the rear end cover of the motor. The axial parallel arrangement mode of the induction unit 12 and the motor can ensure that the normal line of the magnetic ring is perpendicular to the plane of the PCB or the chip wafer, thereby ensuring that the amplitude of the magnetic sensitive element is consistent and the phase difference is fixed.
In this embodiment, a processing unit and a power supply unit may be added to the sensing unit 12. The processing unit is connected with the magnetic sensing element, and the processing unit can realize phase and amplitude correction and position and speed calculation. And the power supply unit connected with the processing unit is used for supplying power to the processing unit.
At least one magnetic sensor 13 is arranged on the sensing unit 12. In one embodiment, the magneto-sensitive element 13 is encapsulated inside the sensing unit, and in another embodiment, the magneto-sensitive element 13 is directly mounted on the surface of the sensing unit.
Specifically, when the magnetic sensor element 13 is welded, if the fixed element is dispensed, the accuracy of the phase accuracy can be further ensured by the precise rotation of the chip mounter.
The magnetic sensing elements 13 convert the detected magnetic field intensity of the magnetic ring into corresponding voltage signals, and for a single pair of magnetic poles, if only one corresponding magnetic sensing element exists, a sinusoidal signal or a pulse signal is generated every revolution for marking a zero point.
In the present embodiment, the magneto-sensitive element 13 is a Hall element, an AMR element, a GMR element or a TMR element.
The number of the magnetic rings corresponding to the magnetosensitive elements is at least one no matter the magnetic rings are one layer composed of a plurality of pairs of magnetic poles or one layer composed of a single pair of magnetic poles.
Preferably, when one layer of magnetic ring 11 has a plurality of corresponding magneto-sensitive elements, the phase difference between two adjacent magneto-sensitive elements 13 is 90 °. Please refer to fig. 2, which is a schematic top view of a magnetic sensor corresponding to a magnetic ring with a single magnetic pole pair of a magnetic encoder. As shown in fig. 2, the distance D between each two of the magnetic sensing elements 13 is 2 × R × sin (β); and beta is 90 degrees/2N, N is the pole pair number of the magnetic ring, and R is the distance from the center of the magnetic ring to the induction area of the magnetic sensitive element.
The voltage signal generated by each magnetic sensitive element is related to the number of pole pairs of the magnetic ring, and the number of the pole pairs is the number of the pole pairs of the magnetic ring. For example: as shown in fig. 2, for a magnetic ring with a single pair of magnetic poles, two magnetic sensors 13 with a phase difference of 90 degrees are used to convert the magnetic field strength of the magnetic ring, and each magnetic sensor generates one path of voltage signal respectively once per rotation, the phase difference of the two paths of voltage signals is 90 degrees, that is, the magnetic sensor 1 generates one sinusoidal signal 1, the magnetic sensor 2 generates one sinusoidal signal 2, and the phase difference between the sinusoidal signal 1 and the sinusoidal signal 2 is 90 degrees. For another example: if the magnetic ring is two pairs of magnetic poles, the number of the corresponding magneto-sensitive elements is 4, the phase difference between every two adjacent magneto-sensitive elements is 90 degrees, each magneto-sensitive element (1-4) rotates for one circle to generate a voltage signal, each voltage signal comprises 2 periods of sinusoidal signals, and the phase difference between every two adjacent voltage signals is 90 degrees.
The magnetic encoder solves the problem of deviation caused by non-concentricity of the magnetic sensitive element and the magnetic ring in the prior art, ensures consistent amplitude of the magnetic sensitive element and fixed phase difference, and improves assembly precision and installation efficiency. In addition, the PCB and the motor rotating shaft which are vertically installed by hand are modified into the sensing unit and the motor rotating shaft which are arranged in parallel, so that the installation requirement and difficulty are reduced, and the deviation caused by concentric installation is eliminated. In the embodiment, the magnetic sensing elements correspond to one layer of magnetic ring, so that the position detection precision of magnetic coding can be improved.
Example two
The embodiment includes an electronic device, please refer to fig. 3, which is a schematic structural diagram of the electronic device in an embodiment. As shown in fig. 3, the electronic device 3 includes: the magnetic encoder 31, the motor 32 connected with the magnetic encoder 31, and the motor driver 33 respectively connected with the magnetic encoder 31 and the motor 32.
The magnetic encoder 3 comprises a magnetic ring, an induction unit and at least one magnetic sensing element.
In this embodiment, the magnetic ring is sleeved on the motor.
Specifically, the magnetic rings with two layers are sleeved on the motor in a stacking manner, that is, the magnetic rings can be sleeved on the motor in a one-layer manner or in a multi-layer manner. Each layer of magnetic ring is composed of a pair of magnetic poles or a plurality of pairs of magnetic poles, wherein the single pair of magnetic poles means that the layer of magnetic ring only comprises a pair of N poles and S poles, and the plurality of pairs of magnetic poles means that the layer of magnetic ring comprises a plurality of pairs of N poles and S poles.
As an embodiment, when the magnetic ring is sleeved on the motor in a layer manner, the interior of the magnetic ring can be divided into a plurality of layers of magnetic rings, and the magnetic rings only look as a whole in appearance. As another embodiment, when the magnetic ring is sleeved on the motor in a one-layer manner, only one layer of magnetic ring may be inside the magnetic ring. When the magnetic ring is sleeved on the motor in a multi-layer mode, the magnetic ring is divided into an upper magnetic ring and a lower magnetic ring, one implementation mode of the magnetic ring is that the upper magnetic ring can be a single pair of magnetic poles, and the lower magnetic ring can be a plurality of pairs of magnetic poles; in another embodiment of the magnetic ring, the upper magnetic ring and the lower magnetic ring are both single pairs of magnetic poles; in another embodiment of the magnetic ring, the upper magnetic ring and the lower magnetic ring are both provided with a plurality of pairs of magnetic poles.
Each layer of magnetic ring is provided with a corresponding magnetic sensitive element, and the height of the magnetic sensitive element (namely the axial direction of the motor) does not protrude out of the lower surface of the layer of magnetic ring and does not protrude out of the upper surface of the layer of magnetic ring, namely, the minimum number of the magnetic sensitive elements is the number of the layers of the magnetic rings, so that the magnetic field intensity of each layer of the magnetic rings can be detected.
In this embodiment, the magnetic ring is a radially magnetized magnetic ring.
The induction unit is arranged in parallel with the motor 32 in the axial direction as a carrier of the magnetic sensing element. In this embodiment, the sensing unit is a chip die or a PCB.
Specifically, the induction unit is installed on the inner side of a concentric arc of the rear end cover of the motor. The axial parallel arrangement mode of the induction unit and the motor can ensure that the normal line of the magnetic ring is perpendicular to the plane of the PCB or the chip wafer, thereby ensuring that the amplitude of the magnetic sensitive element is consistent and the phase difference is fixed.
In this embodiment, a processing unit and a power supply unit may be added to the sensing unit. The processing unit is connected with the magnetic sensing element, and the processing unit can realize phase and amplitude correction and position and speed calculation. And the power supply unit connected with the processing unit is used for supplying power to the processing unit.
At least one magnetic sensing element is arranged on the sensing unit. In one embodiment, the magneto-sensitive element is encapsulated inside the sensing unit, and in another embodiment, the magneto-sensitive element is mounted directly on the surface of the sensing unit. The magnetic sensitive element converts the detected magnetic field intensity of the magnetic ring into a voltage signal, and generates a sinusoidal signal or a pulse signal for marking a zero point for each rotation of a single pair of magnetic pole magnetic tracks.
In the present embodiment, the magneto-sensitive element is a Hall element, an AMR element, a GMR element or a TMR element.
The number of the magnetic rings corresponding to the magnetosensitive elements is at least one no matter the magnetic rings are one layer composed of a plurality of pairs of magnetic poles or one layer composed of a single pair of magnetic poles.
When one layer has a plurality of corresponding magneto-sensitive elements, the phase difference adopted by two adjacent magneto-sensitive elements is 90 degrees. In the present embodiment, the distance D between each two of the magnetic sensing elements is 2 × R × sin (β); and beta is 90 degrees/2N, N is the pole pair number of the magnetic ring, and R is the distance from the center of the magnetic ring to the induction area of the magnetic sensitive element.
The voltage signal generated by each magnetic sensitive element is related to the number of pole pairs of the magnetic ring, and the number of the pole pairs is the number of the pole pairs of the magnetic ring. For example: as shown in fig. 2, for a magnetic ring with a single pair of magnetic poles, two magnetic sensors 13 with a phase difference of 90 degrees are used to convert the magnetic field strength of the magnetic ring, and each magnetic sensor generates one path of voltage signal respectively once per rotation, the phase difference of the two paths of voltage signals is 90 degrees, that is, the magnetic sensor 1 generates one sinusoidal signal 1, the magnetic sensor 2 generates one sinusoidal signal 2, and the phase difference between the sinusoidal signal 1 and the sinusoidal signal 2 is 90 degrees. For another example: if the magnetic ring is two pairs of magnetic poles, the number of the corresponding magneto-sensitive elements is 4, the phase difference between every two adjacent magneto-sensitive elements is 90 degrees, each magneto-sensitive element (1-4) rotates for one circle to generate a voltage signal, each voltage signal comprises 2 periods of sinusoidal signals, and the phase difference between every two adjacent voltage signals is 90 degrees. In conclusion, the magnetic encoder solves the problem of deviation caused by non-concentricity of the magnetic sensing element and the magnetic ring in the prior art, ensures that the amplitudes of the magnetic sensing element are consistent, the phase difference is fixed, and improves the assembly precision and the installation efficiency. In addition, the PCB and the motor rotating shaft which are vertically installed manually are modified into the induction unit and the motor rotating shaft which are arranged in parallel, so that the installation requirement and difficulty are reduced, and the deviation caused by concentric installation is eliminated. The invention adopts a plurality of magnetic sensitive elements corresponding to one layer of magnetic ring, and can improve the position detection precision of magnetic coding. The invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A magnetic encoder is connected with a motor; characterized in that the magnetic encoder comprises:
the magnetic ring is sleeved on the motor;
the induction unit is axially arranged in parallel with the motor;
and the magnetic sensing element corresponding to the magnetic ring is arranged on the sensing unit.
2. The magnetic encoder of claim 1, wherein: the induction unit is arranged on the inner side of the concentric circular arc of the rear end cover of the motor.
3. The magnetic encoder of claim 1, wherein: the magnetic ring adopts a radial magnetizing type magnetic ring; the magnetic ring is divided into one layer or a plurality of layers.
4. The magnetic encoder of claim 3, wherein: each layer of the magnetic ring is composed of a single pair of magnetic poles or a plurality of pairs of magnetic poles.
5. The magnetic encoder of claim 4, wherein: the number of the magnetic sensitive elements corresponding to each layer of the magnetic ring is at least one.
6. The magnetic encoder of claim 4, wherein: when the number of the magneto-sensitive elements corresponding to the magnetic ring is two or more, the phase difference between two adjacent magneto-sensitive elements is 90 degrees.
7. The magnetic encoder of claim 7, wherein: the distance D ═ 2R ═ sin (beta) between two adjacent magneto-sensitive elements; and beta is 90 degrees/2N, N is the pole pair number of the magnetic ring, and R is the distance from the center of the magnetic ring to the induction area of the magnetic sensitive element.
8. The magnetic encoder of claim 1, wherein: the sensing unit adopts a chip wafer or a PCB circuit board.
9. The magnetic encoder of claim 1, wherein: the magnetic encoder further includes:
the processing unit is connected with the magnetic sensing element;
and the power supply unit is connected with the processing unit.
10. An electronic device, characterized in that: the method comprises the following steps:
the magnetic encoder of any one of claims 1 to 9;
the motor is connected with the magnetic encoder;
and the motor driver is respectively connected with the magnetic encoder and the motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011411918.7A CN114614630A (en) | 2020-12-04 | 2020-12-04 | Magnetic encoder and electronic device having the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011411918.7A CN114614630A (en) | 2020-12-04 | 2020-12-04 | Magnetic encoder and electronic device having the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114614630A true CN114614630A (en) | 2022-06-10 |
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ID=81856455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011411918.7A Pending CN114614630A (en) | 2020-12-04 | 2020-12-04 | Magnetic encoder and electronic device having the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114614630A (en) |
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2020
- 2020-12-04 CN CN202011411918.7A patent/CN114614630A/en active Pending
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Effective date of registration: 20220628 Address after: 201203 floor 10, block a, building 1, No. 1867, Zhongke Road, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai Applicant after: Xiaohua Semiconductor Co.,Ltd. Address before: 201203 Floor 9, building a, No. 1867, Zhongke Road, Pudong New Area, Pudong New Area, Shanghai Applicant before: HUADA SEMICONDUCTOR Co.,Ltd. |
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