CN113691189B - Method for correcting non-linearity of zero magnetic area of magnet of closed-loop voice coil motor - Google Patents
Method for correcting non-linearity of zero magnetic area of magnet of closed-loop voice coil motor Download PDFInfo
- Publication number
- CN113691189B CN113691189B CN202110987198.7A CN202110987198A CN113691189B CN 113691189 B CN113691189 B CN 113691189B CN 202110987198 A CN202110987198 A CN 202110987198A CN 113691189 B CN113691189 B CN 113691189B
- Authority
- CN
- China
- Prior art keywords
- hall
- magnetic field
- voice coil
- closed
- coil motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000008859 change Effects 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 6
- 230000000712 assembly Effects 0.000 abstract description 6
- 238000000429 assembly Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- 230000006698 induction Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000011295 pitch Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/032—Reciprocating, oscillating or vibrating motors
- H02P25/034—Voice coil motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/14—Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/02—Arrangements for regulating or controlling the speed or torque of electric DC motors the DC motors being of the linear type
- H02P7/025—Arrangements for regulating or controlling the speed or torque of electric DC motors the DC motors being of the linear type the DC motors being of the moving coil type, e.g. voice coil motors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Linear Motors (AREA)
Abstract
The invention discloses a method for correcting nonlinearity of a zero magnetic field of a magnet of a closed-loop voice coil motor, which comprises the following steps: the method comprises the steps that a Hall assembly is arranged, the Hall assembly has a certain length, and two ends of the Hall assembly are symmetrical about the center of a magnetic field; when the closed-loop voice coil motor moves, the Hall assembly synchronously moves along with the closed-loop voice coil motor; the Hall assembly is used for sensing the change of the magnetic field when the closed-loop voice coil motor moves, and when the closed-loop voice coil motor moves to the positive direction and the negative direction, the magnetic field sensed by the Hall assembly in the linear section is used as a motor position signal. The advantages are that: according to the method, the Hall assemblies with the two ends symmetrical with respect to the center of the magnetic field are arranged, when the closed-loop voice coil motor moves, the magnetic field induced by the Hall assemblies in the linear section is used as a motor position signal, so that the linearity of the motor position in the whole stroke is better, and the photographing effect of the closed-loop voice coil motor is improved.
Description
Technical Field
The invention relates to the technical field of voice coil motor control, in particular to a method for correcting nonlinearity of a zero magnetic region of a magnet of a closed-loop voice coil motor.
Background
With the continuous improvement of the requirements of the camera quality of the mobile phone, in recent years, more products adopting a closed-loop control voice coil motor as a lens driving motor of a camera of the mobile phone are available.
In a closed loop control voice coil motor, the position of the motor is determined by the magnitude of the induced magnetic field of a hall sensor (hall sensor) in the magnetic field. The motor can drive one device of the Hall and the magnet to move, and the other device of the Hall and the magnet can be fixed on the bracket; when the motor moves, the relative positions of the Hall and the magnet can be changed, so that the magnitude of the magnetic field sensed by the Hall is changed; the closed-loop control voice coil motor determines different positions of the motor according to different sensed magnetic fields of the Hall sensor.
Since the closed loop control voice coil motor determines the position of the motor by sensing the magnitude of the magnetic field through the hall device, when there is nonlinearity between the magnitude of the magnetic field and the position, the travel of the motor position movement will also be nonlinear. The presence of nonlinearity can affect the accuracy of the voice coil motor position, thereby affecting the focusing accuracy and further affecting the quality of the photographed image.
The magnet is usually composed of a magnetic south pole (S pole) and a magnetic north pole (N pole), and when the magnet is manufactured by hand, there is often a zero magnetic field between the magnetic south pole and the magnetic north pole, which is neither a south pole nor a north pole. The presence of the zero field causes a change in the linearity of the relationship between the magnetic field strength around the magnet and the position in the vicinity of the zero field, i.e. a non-linearity of the relationship between position and magnetic field strength, which non-linearity leads to non-linearities in the stroke of the voice coil motor.
Disclosure of Invention
The invention aims to provide a method for correcting nonlinearity of a zero magnetic area of a magnet of a closed-loop voice coil motor, which comprises the steps of arranging Hall components with two ends symmetrical with respect to the center of a magnetic field, and synchronously moving along with the closed-loop voice coil motor when the closed-loop voice coil motor moves; the Hall assembly is used for sensing the change of the magnetic field when the closed-loop voice coil motor moves, and when the closed-loop voice coil motor moves to the positive direction and the negative direction, the magnetic field sensed by the Hall assembly in the linear section is used as a motor position signal. In the whole moving process, the magnetic field where the Hall assembly at the induction position is located has better linearity, so that the linearity of the motor position in the whole stroke is better, and the photographing effect of the closed-loop voice coil motor is improved.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
a method of correcting for non-linearities in a zero field of a closed-loop voice coil motor magnet, comprising:
The method comprises the steps of setting a Hall assembly, wherein the Hall assembly has a certain length, and the length of the Hall assembly is longer than the length of a zero magnetic region range of a magnetic field;
When the closed-loop voice coil motor moves, the Hall assembly synchronously moves along with the closed-loop voice coil motor;
The Hall assembly is used for sensing the change of the magnetic field when the closed-loop voice coil motor moves, and when the closed-loop voice coil motor moves to the positive direction and the negative direction, the magnetic field sensed by the Hall assembly in the linear section is used as a motor position signal.
Optionally, the hall assembly is a first hall device, and the first hall device has a certain length.
Alternatively, the first hall device has a length of 10 μm or 25 μm or 50 μm or 100 μm or 200 μm or 300 μm or 500 μm.
Optionally, the hall assembly includes:
the second Hall device and the third Hall device are symmetrically arranged about the center of the magnetic field, and the moving speeds of the second Hall device and the third Hall device are the same.
Optionally, a distance between the second hall device and the third hall device is adjustable.
Optionally, the distance between the second hall device and the third hall device is 10 μm or 25 μm or 50 μm or 100 μm or 200 μm or 300 μm or 500 μm.
Compared with the prior art, the invention has the following advantages:
In the method for correcting the nonlinearity of the zero magnetic field of the magnet of the closed-loop voice coil motor, through arranging the Hall assemblies with two ends symmetrical with respect to the center of a magnetic field, when the closed-loop voice coil motor moves, the Hall assemblies synchronously move along with the closed-loop voice coil motor; the Hall assembly is used for sensing the change of the magnetic field when the closed-loop voice coil motor moves, and when the closed-loop voice coil motor moves to the positive direction and the negative direction, the magnetic field sensed by the Hall assembly in the linear section is used as a motor position signal. In the whole moving process, the magnetic field of the Hall component at the induction position has better linearity, so that the linearity of the motor position in the whole stroke is better.
Furthermore, in the method for correcting the nonlinearity of the zero magnetic field of the magnet of the closed-loop voice coil motor, the Hall component is a single Hall device (a first Hall device) or two Hall devices (a second Hall device and a third Hall device) which are combined, so that the nonlinearity of the stroke of the voice coil motor caused by the zero magnetic field of the magnet can be effectively corrected, the linearity of the stroke of the motor is improved, and the photographing effect of the closed-loop voice coil motor is further improved.
Drawings
FIG. 1 is a schematic diagram of a method for correcting non-linearity of a magnetic zero region of a closed loop voice coil motor according to the present invention;
FIG. 2 is a schematic diagram of the relationship between the magnetic field strength around a magnet and the position in an ideal case according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing the relationship between the magnetic field strength around a magnet and the position in the practical situation according to the theory provided by the embodiment of the invention;
FIG. 4 is a schematic diagram showing the relationship between the magnetic field strength around a magnet and the position according to the practical test of the present invention;
FIG. 5 is a schematic diagram showing the approximate relationship between the magnetic field strength and the position of the middle region of the selected magnet according to the embodiment of the present invention;
FIG. 6 is a schematic diagram of a Hall assembly according to an embodiment of the present invention in a magnetic field;
FIG. 7 is a diagram illustrating a relationship between sensed magnetic field and position of a Hall device small enough according to an embodiment of the present invention;
FIG. 8 is a graph showing the relationship between the equivalent magnetic field sensed by the first Hall device of each length and the position according to the embodiment of the present invention;
FIG. 9 is a graph showing the relationship between the nonlinearity of the equivalent magnetic field sensed by the first Hall device of each length and the length of the Hall device according to the embodiment of the present invention;
FIG. 10 is a graph showing the relationship between the equivalent magnetic fields induced by different pitches of the Hall device and the position according to the embodiment of the present invention;
FIG. 11 shows the relationship between the nonlinearity of the equivalent magnetic field induced by different pitches of the Hall device and the pitch of the Hall device according to the embodiment of the invention.
Detailed Description
The invention will be further described by the following detailed description of a preferred embodiment, taken in conjunction with the accompanying drawings.
The method for correcting the nonlinearity of the two ends of the magnetic field of the closed-loop voice coil motor is further described in detail below with reference to the accompanying drawings and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for the purpose of facilitating and clearly aiding in the description of embodiments of the invention. For a better understanding of the invention with objects, features and advantages, refer to the drawings. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that any modifications, changes in the proportions, or adjustments of the sizes of structures, proportions, or otherwise, used in the practice of the invention, are included in the spirit and scope of the invention which is otherwise, without departing from the spirit or essential characteristics thereof.
As shown in fig. 1, a method for correcting non-linearity of a magnetic zero region of a closed loop voice coil motor according to the present invention includes: the Hall assembly is arranged, the Hall assembly has a certain length, and the length is larger than the zero magnetic area position of the magnetic field, namely the length of the Hall assembly is larger than the zero magnetic area range length of the magnetic field, so that one end of the Hall assembly is always in a linear section when the motor moves; when the closed-loop voice coil motor moves, the Hall assembly synchronously moves along with the closed-loop voice coil motor; the Hall assembly is used for sensing the change of the magnetic field when the closed-loop voice coil motor moves, and when the closed-loop voice coil motor moves to the positive direction and the negative direction, the magnetic field sensed by the Hall assembly in the linear section is used as a motor position signal.
As shown in fig. 2, the relationship between the magnetic field strength around the magnet and the position is ideal. In fig. 2, the rectangle indicates a magnet, N indicates a magnetic north pole, and S indicates a magnetic south pole; the lower graph of fig. 2 shows the correspondence between the position around the magnet and the magnetic field strength, wherein the abscissa indicates the position and the ordinate indicates the magnetic field strength.
Specifically, as shown in fig. 2, the magnetic field around the magnet is ideally approximately sinusoidal (sine wave) with respect to position. In general, a closed-loop control voice coil motor (abbreviated as a motor) will take a portion of the middle of a sine curve with good linearity to perform a motor movement stroke, for example, two areas defined by dashed lines perpendicular to the abscissa in fig. 2, so as to ensure good motor stroke linearity.
However, in practical applications, there is a zero magnetic field between the magnetic south pole and the magnetic north pole of the magnet, and the presence of the zero magnetic field may cause a poor linearity in the middle position of the magnet, as shown in fig. 3.
In fig. 3, the rectangle indicates a magnet, N indicates a magnetic north pole, and S indicates a magnetic south pole; the lower graph of fig. 3 shows the correspondence between the position around the magnet and the magnetic field strength, wherein the abscissa indicates the position and the ordinate indicates the magnetic field strength.
As can be seen from fig. 3, there is little change in the magnetic field strength with position in the vicinity of the location where the magnetic south pole and the magnetic north pole are connected, and there is no correspondence between the magnetic field strength and the coefficient of change in position in other areas in the vicinity of the location, i.e., there is nonlinearity between the magnetic field strength and the location in this area.
The nonlinearity of the area can cause nonlinearity between the actual position and the input target position when the motor moves, namely the motor stroke nonlinearity; this nonlinearity can affect the motor movement position accuracy, affect the focus accuracy, and thus affect the image quality.
As shown in fig. 4, the relationship between the magnetic field strength and the hall position obtained by the actual motor test is shown. In fig. 4, the abscissa indicates the hall position and the ordinate indicates the magnetic field strength. As can be seen from fig. 4, there is a non-linearity of the magnetic field strength with position at the intermediate position. To study the magnetic field nonlinearity near the zero field region of the magnet in fig. 3 and 4, a magnetic field curve in the middle of the magnet is taken and approximated by fig. 5. In fig. 5, the abscissa indicates the position around the magnet in μm, and the ordinate indicates the magnetic field strength at the corresponding position in mT. As can be seen from FIG. 5, between-50 μm and 50 μm, there is nonlinearity between the magnetic field and the position, and other magnetic fields are linear between the position and the position.
When the Hall and the magnet relatively move, the magnetic fields sensed by the Hall correspond to the positions of the Hall and the magnet one by one, so that the nonlinearity of the magnetic fields can be completely reflected, and the motor stroke shows the same nonlinearity.
In a closed loop control voice coil motor, in order to provide a good linearity of the motor stroke and a large stroke, the motor is usually bi-directional and can move from the middle to both sides.
If the Hall is always in the linear region of the magnetic field or the region with better linearity of the magnetic field in the moving process of the motor, but can not move to the region with poor linearity at the two ends of the magnetic field, the magnetic field and the position induced by the Hall are linear, so that the motor is ensured to have better linear travel.
In the present invention, as shown in fig. 6, a hall assembly is provided to sense the change in magnetic field as the closed loop voice coil motor moves. Specifically, the middle position in fig. 6 corresponds to the middle position of the magnetic field, the hall assembly has a certain length, and both ends of the hall assembly are symmetrical about the center of the magnetic field.
When the closed-loop voice coil motor moves, the Hall assembly synchronously moves along with the closed-loop voice coil motor. The Hall assembly is used for sensing the change of the magnetic field when the closed-loop voice coil motor moves, and when the closed-loop voice coil motor moves to the positive direction and the negative direction, the magnetic field sensed by the Hall assembly in the linear section is used as a motor position signal. In the whole moving process, the magnetic field of the Hall device at the induction position has better linearity, so that the linearity of the motor position in the whole stroke is better.
In this embodiment, the hall element is a first hall device, which is a single hall system, and the first hall device has a certain length.
In a single hall system, since the first hall device itself has a size, the magnetic field strength sensed by different places of the first hall device is different in the magnetic field varying with the position, so the final output voltage of the first hall device should be the average of all the magnetic fields sensed by the first hall device, and the average magnetic field can be regarded as the integral of the magnetic field strengths of different places of the first hall device, and then divided by the total area of the first hall device.
When the area of the first hall device is small enough to be considered a point, the relationship of the sensed magnetic field to the position is shown in fig. 7. The light black lines in fig. 7 represent the magnitude of the sensed magnetic field of the spot hall device moving at a position of + -200 μm, wherein the abscissa represents position in μm and the ordinate represents hall-sensed magnetic field in mT. As can be seen from comparing fig. 7 and 5, when the area of the hall device is sufficiently small, the hall device can fully reflect the characteristics of the magnetic field. When the hall is of a certain size, the equivalent magnetic field on it is the average of the magnetic fields induced across the hall face, so that the magnetic field has an average effect. Therefore, the magnetic field induced by the first Hall device with a certain length has better linearity, so that the linearity of the motor position in the whole stroke is better.
Alternatively, the first hall device has a length of 10 μm or 25 μm or 50 μm or 100 μm or 200 μm or 300 μm or 500 μm. Illustratively, the first hall device is moved within ±200 μm, and the relationship between the equivalent magnetic field induced by the first hall device and the position simulating each length is shown in fig. 8. Here the 0 μm position is where the first hall device midpoint is aligned with the magnetic field midpoint.
The abscissa in fig. 8 represents the position of the first hall device, and the ordinate represents the equivalent magnetic field induced by the first hall device. As can be seen from fig. 8, as the size of the first hall device increases, the nonlinearity of the equivalent magnetic field induced by the first hall device gradually decreases.
FIG. 9 is a graph of the maximum nonlinear error of the sensed magnetic field when the first Hall devices of different sizes are moved in + -200 μm positions. The abscissa in fig. 9 represents the size of the first hall device, and the ordinate represents the nonlinearity of the induced magnetic field.
As can also be seen from fig. 9, as the size of the first hall device increases, the nonlinear error of the magnetic field induced by the first hall device gradually decreases; when the size of the first Hall device is increased to 500 mu m, the nonlinear error of the magnetic field induced by the first Hall device is reduced to zero.
From the above, it can be seen that increasing the size of the first hall device can reduce the nonlinearity of the magnetic field at the zero region of the magnetic field. In actual work, the first Hall device with proper size can be selected for application according to the needs and the actual application scene.
In another embodiment, on the other hand, the hall assembly includes a second hall device and a third hall device. The second Hall device and the third Hall device are symmetrically arranged about the center of the magnetic field, and the moving speeds of the second Hall device and the third Hall device are the same.
The magnetic fields induced by the two Hall devices are equivalent to the magnetic fields induced by one Hall device with large area, and the mode can effectively reduce the size of the applied Hall device so as to reduce the area for correcting the nonlinear consumption of the zero magnetic region. Specifically, when two hall devices are used to induce magnetic fields, an equivalent magnetic field strength can be obtained after summing and averaging the magnetic fields induced by the two hall devices.
Further, the distance between the second Hall device and the third Hall device is adjustable. In practical application, the size of the magnetic field where the two Hall devices are simultaneously positioned can be changed by changing the distance between the two Hall devices, so that the characteristics of the induced equivalent magnetic field are changed.
For example, when the distances between the second hall device and the third hall device are set to 10 μm, 25 μm, 50 μm, 100 μm, 200 μm, 300 μm, and 500 μm, respectively, the two hall devices are moved within ±200 μm, and the equivalent magnetic fields sensed by the two hall devices can be simulated as shown in fig. 10. Here the 0 μm position is where the midpoint of the two hall devices are aligned with the midpoint of the magnetic field.
In fig. 10, the abscissa indicates the moving position of the hall device in μm, and the ordinate indicates the equivalent magnetic field induced by the hall device in mT.
As can be seen from fig. 10, when the distance between the second hall device and the third hall device is small, there is nonlinearity in the equivalent magnetic field induced at the middle position of the zero magnetic field; as the interval between the two hall devices is gradually increased, the nonlinearity at the intermediate position is gradually improved; when the distance between the two Hall devices is increased to a certain position, the nonlinearity of the magnetic field at the middle position of the zero magnetic region disappears, and the nonlinearity exists in the equivalent magnetic field induced at the two side positions. Further, as can also be seen from fig. 10, as the size between the two hall devices increases gradually, the nonlinearity of the equivalent magnetic field induced between the two hall devices decreases gradually.
As shown in fig. 11, the magnitude of the nonlinear error of the equivalent magnetic field is sensed when the distances between the two hall devices are different. As can be seen from fig. 11, as the distance between the two hall devices increases, the overall trend of the induced equivalent magnetic field nonlinearity decreases; when the distance between the two hall devices is 500 μm, the equivalent magnetic field nonlinearity induced by the hall assembly decreases to 0.
From the above, the hall assembly adopts two hall devices to correct the nonlinearity of the magnetic field of the zero magnetic region, and the nonlinearity of the magnetic field of the zero magnetic region can be reduced to an ideal value by reasonably designing the distance between the two hall devices; when the distance between the two Hall devices is pulled, a certain amount of circuits which do not affect the Hall performance can be placed in the space between the two Hall devices, so that the full utilization of the area is realized.
In summary, in the method for correcting the nonlinearity of the magnetic zero region of the closed-loop voice coil motor according to the present invention, by arranging the hall assemblies with both ends symmetrical with respect to the center of the magnetic field, when the closed-loop voice coil motor moves, the hall assemblies move synchronously along with the closed-loop voice coil motor; the Hall assembly is used for sensing the change of the magnetic field when the closed-loop voice coil motor moves, and when the closed-loop voice coil motor moves to the positive direction and the negative direction, the magnetic field sensed by the Hall assembly in the linear section is used as a motor position signal. In the whole moving process, the magnetic field of the Hall component at the induction position has better linearity, so that the linearity of the motor position in the whole stroke is better.
Furthermore, in the method for correcting the nonlinearity of the zero magnetic field of the magnet of the closed-loop voice coil motor, the Hall component is a mode of combining a single Hall device (a first Hall device) or two Hall devices (a second Hall device and a third Hall device), so that the nonlinearity of the stroke of the voice coil motor caused by the zero magnetic field of the magnet can be effectively corrected, the linearity of the stroke of the motor is improved, and the photographing effect of the closed-loop voice coil motor is further improved.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described in detail through the foregoing description of the preferred embodiment, it should be understood that the foregoing description is not to be considered as limiting the invention. Many modifications and substitutions of the present invention will become apparent to those of ordinary skill in the art upon reading the foregoing. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (2)
1. A method of correcting for non-linearities in a zero field of a closed-loop voice coil motor magnet, comprising:
The method comprises the steps that a Hall assembly is arranged, the Hall assembly is a first Hall device, the first Hall assembly has a certain length, and the length of the first Hall assembly is larger than the length of a zero magnetic region range of a magnetic field;
when the closed-loop voice coil motor moves, the first Hall assembly synchronously moves along with the closed-loop voice coil motor;
The magnetic field change when the closed-loop voice coil motor moves is induced by the first Hall component, when the closed-loop voice coil motor moves to the positive direction and the negative direction, the magnetic field induced by the first Hall component in the linear section is used as a motor position signal, when the first Hall device has a certain size, the equivalent magnetic field on the first Hall device is the average of the magnetic field induced on the whole Hall surface, the magnetic field has an average effect, and the magnetic field induced by the first Hall device with a certain length size has better linearity, so that the linearity of the motor position in the whole stroke is better.
2. A method of correcting for zero field nonlinearity of a closed loop voice coil motor magnet as recited in claim 1, wherein,
The first hall device has a length of 10 μm or 25 μm or 50 μm or 100 μm or 200 μm or 300 μm or 500 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110987198.7A CN113691189B (en) | 2021-08-26 | 2021-08-26 | Method for correcting non-linearity of zero magnetic area of magnet of closed-loop voice coil motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110987198.7A CN113691189B (en) | 2021-08-26 | 2021-08-26 | Method for correcting non-linearity of zero magnetic area of magnet of closed-loop voice coil motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113691189A CN113691189A (en) | 2021-11-23 |
| CN113691189B true CN113691189B (en) | 2024-04-23 |
Family
ID=78582836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110987198.7A Active CN113691189B (en) | 2021-08-26 | 2021-08-26 | Method for correcting non-linearity of zero magnetic area of magnet of closed-loop voice coil motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113691189B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010159982A (en) * | 2009-01-06 | 2010-07-22 | Asahi Kasei Electronics Co Ltd | Semiconductor device and method of manufacturing the same |
| CN102185482A (en) * | 2011-04-12 | 2011-09-14 | 聚辰半导体(上海)有限公司 | Switch power controller and valley bottom switching method thereof |
| JP2013083597A (en) * | 2011-10-12 | 2013-05-09 | Asahi Kasei Electronics Co Ltd | Position detector, position detection method and electronic apparatus using the same |
| CN103701398A (en) * | 2007-10-01 | 2014-04-02 | 阿莱戈微***有限责任公司 | Hall-effect based linear motor controller |
| CN104374506A (en) * | 2014-11-14 | 2015-02-25 | 西北工业大学 | Dangling type micro-impulse testing device and method |
| JP2015064547A (en) * | 2013-01-24 | 2015-04-09 | ピーエス特機株式会社 | Hand tremor correction unit |
| CN106643820A (en) * | 2016-12-30 | 2017-05-10 | 北京交通大学 | Inner cone angle magnetic liquid inertia sensor for rectangular permanent magnet |
| CN207117457U (en) * | 2017-08-14 | 2018-03-16 | 厦门新鸿洲精密科技有限公司 | It can be achieved to automatically adjust the closed loop voice coil motor of movement locus |
| CN113098356A (en) * | 2021-05-24 | 2021-07-09 | 聚辰半导体股份有限公司 | Method for correcting nonlinearity of two ends of magnetic field of closed-loop voice coil motor |
-
2021
- 2021-08-26 CN CN202110987198.7A patent/CN113691189B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701398A (en) * | 2007-10-01 | 2014-04-02 | 阿莱戈微***有限责任公司 | Hall-effect based linear motor controller |
| JP2010159982A (en) * | 2009-01-06 | 2010-07-22 | Asahi Kasei Electronics Co Ltd | Semiconductor device and method of manufacturing the same |
| CN102185482A (en) * | 2011-04-12 | 2011-09-14 | 聚辰半导体(上海)有限公司 | Switch power controller and valley bottom switching method thereof |
| JP2013083597A (en) * | 2011-10-12 | 2013-05-09 | Asahi Kasei Electronics Co Ltd | Position detector, position detection method and electronic apparatus using the same |
| JP2015064547A (en) * | 2013-01-24 | 2015-04-09 | ピーエス特機株式会社 | Hand tremor correction unit |
| CN104374506A (en) * | 2014-11-14 | 2015-02-25 | 西北工业大学 | Dangling type micro-impulse testing device and method |
| CN106643820A (en) * | 2016-12-30 | 2017-05-10 | 北京交通大学 | Inner cone angle magnetic liquid inertia sensor for rectangular permanent magnet |
| CN207117457U (en) * | 2017-08-14 | 2018-03-16 | 厦门新鸿洲精密科技有限公司 | It can be achieved to automatically adjust the closed loop voice coil motor of movement locus |
| CN113098356A (en) * | 2021-05-24 | 2021-07-09 | 聚辰半导体股份有限公司 | Method for correcting nonlinearity of two ends of magnetic field of closed-loop voice coil motor |
Non-Patent Citations (1)
| Title |
|---|
| 基于自跟随的霍尔位移测量范围扩展的研究;关明杰, 江建民, 刘义, 陈文芗;控制工程(第06期);第94-96页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113691189A (en) | 2021-11-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100964406B1 (en) | Position detection apparatus | |
| KR100387190B1 (en) | Lens barrel | |
| JP6061317B2 (en) | Displacement sensor that measures the position in a non-contact manner by a plurality of magnetic field sensors arranged in series | |
| US5453684A (en) | Position detecting method for use in optical system of a video camera for correcting gain and offset for periodic waveforms | |
| US20090072818A1 (en) | Position sensor, optical head device, head moving mechanism, information recordng/reproducing device and position control system | |
| US20050232094A1 (en) | Driving device and an optical apparatus | |
| JP4679170B2 (en) | Image blur correction device | |
| KR20160080110A (en) | Camera module adjustment method, lens position control device, control device and control method for linear motion device | |
| US20050265705A1 (en) | Anti-shake apparatus | |
| KR101832606B1 (en) | Sensorless controller of linear actuator | |
| CN113098356A (en) | Method for correcting nonlinearity of two ends of magnetic field of closed-loop voice coil motor | |
| JPS61245121A (en) | Zoom lens device | |
| US7440686B2 (en) | Anti-shake apparatus | |
| CN113691189B (en) | Method for correcting non-linearity of zero magnetic area of magnet of closed-loop voice coil motor | |
| JP4530691B2 (en) | Image blur correction device | |
| JP4655701B2 (en) | Position detection device, blur correction device, and lens barrel | |
| KR101271735B1 (en) | A positioning apparatus | |
| JP4778711B2 (en) | Image blur correction device | |
| KR102218898B1 (en) | Apparatus for controlling position of camera module | |
| JP2000227614A (en) | Lens barrel | |
| KR20170055142A (en) | Apparatus and method for controlling auto focus of camera module | |
| JP2005331706A (en) | Lens drive device for correcting camera shake | |
| JP4714474B2 (en) | Movable body position detection device and image blur correction device | |
| JP2006284415A (en) | Position detection system and camera | |
| JP2013246030A (en) | Position detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |