CN111245190A - Linear motor control method, linear motor, drive circuit, and electronic device - Google Patents
Linear motor control method, linear motor, drive circuit, and electronic device Download PDFInfo
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- CN111245190A CN111245190A CN201911308788.1A CN201911308788A CN111245190A CN 111245190 A CN111245190 A CN 111245190A CN 201911308788 A CN201911308788 A CN 201911308788A CN 111245190 A CN111245190 A CN 111245190A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K33/02—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
- H02K33/18—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets
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- 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
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- 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
- H02P25/06—Linear motors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
The embodiment of the application discloses linear motor, wherein, linear motor includes: a housing; a vibration unit located within the housing, at least two displacement determining assemblies, wherein each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit; when the vibration unit vibrates, the induction coil and the first magnet act together to generate induction current, and the induction current is used for determining the displacement of the vibration unit in the vibration direction. The embodiment of the application also discloses a control method of the linear motor, a drive circuit and electronic equipment.
Description
Technical Field
The embodiments of the present application relate to electronic technologies, and relate to, but are not limited to, a linear motor, a control method of a linear motor, and an electronic device.
Background
At present, in order to improve the tactile sensation of users, more and more electronic devices (such as mobile phones) are beginning to carry linear motors, because the vibration effect of linear motors is finer than that of eccentric motors. When the linear motor works, the linear motor can be equivalent to the combination of a free-following vibration system (namely a damping system) and a steady-state forced vibration system (namely a solenoid drive system). The magnitude of the damping directly affects the vibration effect of the motor, and the larger the damping, the shorter RT (Rise up Time) or BT (Bring down Time), but the smaller the vibration amount, and thus the user feels the vibration feeling insufficient. The smaller the damping is, the larger the vibration amount is, but the longer the RT or BT time is, the more the user feels the wadding, and the graininess is not strong. Therefore, when the linear motor is designed and debugged, the damping and the vibration amount are a pair of contradictory parameters, and compromise is needed.
In actual production, motor manufacturers generally use magnetic liquid or foam as damping. The magnetic liquid has good damping coefficient, but the temperature characteristic is poor, and the physical characteristic can be greatly changed along with the change of the temperature. At high temperatures (e.g., 55 degrees) it is approximately liquid and at low temperatures (e.g., 10 degrees) it is approximately solid. The foam is similar to a sponge, and the damping characteristic of the foam is nonlinear. The characteristics of the materials bring great challenges to the consistency of damping during the production of the motor, and finally lead to great differences of vibration feeling among each mass-produced mobile phone, thereby causing customer complaints. Therefore, how to avoid the problem of device discreteness caused by damping inconsistency becomes a major research point for those skilled in the art.
Disclosure of Invention
In view of the above, embodiments of the present application provide a method for controlling a linear motor, a driving circuit and an electronic device.
The technical scheme of the embodiment of the application is realized as follows:
in a first aspect, an embodiment of the present application provides a linear motor, including:
a housing;
a vibration unit located within the housing, at least two displacement determining assemblies, wherein each displacement determining assembly comprises an induction coil and a first magnet;
each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit;
when the vibration unit vibrates, the induction coil and the first magnet act together to generate induction current, and the induction current is used for determining the displacement of the vibration unit in the vibration direction.
In an embodiment of the present application, the linear motor further includes:
a drive coil and a spring within the housing, wherein;
the vibration unit is connected with the shell through the spring, and when the driving coil is electrified, the vibration unit vibrates in the shell through the spring.
In an embodiment of the present application, the vibration unit includes:
a mass and a second magnet;
wherein the second magnet acts on the drive coil to deform the spring; the mass block vibrates in the shell through the deformation of the spring;
correspondingly, when the mass block vibrates, the induction coil and the first magnet act to generate induction current.
In an embodiment of the present application, the linear motor further includes:
a ferrite coil positioned within the housing, wherein;
when the linear motor is in a starting oscillation state, the ferrite coil generates a polarity opposite to that of the second magnet according to a received first driving signal so as to accelerate the starting oscillation speed of the linear motor;
when the linear motor is in a vibration stopping state, the ferrite coil generates the same polarity as the second magnet according to a received second driving signal so as to accelerate the vibration stopping speed of the linear motor;
wherein the magnitudes of the first and second drive signals are determined according to the displacement of the mass in the vibration direction.
In the embodiment of the present application,
the magnetic induction line directions of the first magnets are the same;
the magnetic induction line direction of each first magnet is perpendicular to the magnetic induction line direction of each second magnet.
In a second aspect, an embodiment of the present application provides a method for controlling a linear motor, the method including:
when a vibration unit in the linear motor vibrates, acquiring a first induction current generated by a displacement determining component in the linear motor at a first moment; the linear motor comprises at least two displacement determining assemblies, each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit;
acquiring a second induced current generated by the displacement determining component at a second time after the first time;
and determining the displacement variation of the vibration unit in the vibration direction according to the first induction current and the second induction current.
In an embodiment of the present application, the method further includes:
determining that the vibration unit is in a starting vibration state or a stopping vibration state according to the first induction current and the second induction current;
when the vibration unit is in a vibration starting state, determining the magnitude of a first driving signal according to the displacement variation, and applying the first driving signal to a ferrite coil in the linear motor to enable the ferrite coil to generate the same polarity as a second magnet for driving the vibration unit to vibrate so as to accelerate the vibration starting speed of the vibration unit;
when the vibration unit is in a vibration stopping state, the size of a second driving signal is determined according to the displacement variation, and the second driving signal is applied to the ferrite coil, so that the ferrite coil generates a polarity opposite to that of the second magnet, and the vibration stopping speed of the vibration unit is accelerated.
In an embodiment of the present application, the determining that the vibration unit is in the start-up state or the stop state according to the first induced current and the second induced current includes:
when the second induced current is larger than the first induced current, determining that the vibration unit is in a vibration starting state;
and when the second induced current is smaller than the first induced current, determining that the vibration unit is in a vibration stopping state.
In a third aspect, an embodiment of the present application provides a driving circuit, including:
the current acquisition module is used for acquiring a first induction current generated by a displacement determination assembly in the linear motor at a first moment when a vibration unit in the linear motor vibrates; the linear motor comprises at least two displacement determining assemblies, each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit;
the current acquisition module is further used for acquiring a second induced current generated by the displacement determination component at a second moment after the first moment;
and the displacement determining module is used for determining the displacement variation of the vibration unit in the vibration direction according to the first induction current and the second induction current.
In an embodiment of the present application, the driving circuit further includes:
the state determining module is used for determining that the vibration unit is in a starting vibration state or a stopping vibration state according to the first induction current and the second induction current;
the processing module is used for determining the magnitude of a first driving signal according to the displacement variation when the vibration unit is in a vibration starting state, and applying the first driving signal to a ferrite coil in the linear motor to enable the ferrite coil to generate the same polarity as a second magnet for driving the vibration unit to vibrate so as to accelerate the vibration starting speed of the vibration unit;
the processing module is further configured to determine a magnitude of a second driving signal according to the displacement variation when the vibration unit is in a vibration-off state, and apply the second driving signal to the ferrite coil, so that the ferrite coil generates a polarity opposite to that of the second magnet, thereby accelerating a vibration-off speed of the vibration unit.
In a fourth aspect, embodiments of the present application provide an electronic device, including a linear motor and a driving circuit;
wherein the linear motor includes: a housing; a vibration unit located within the housing, at least two displacement determining assemblies, wherein each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit;
when the vibration unit vibrates, the induction coil and the first magnet act to generate induction current, and the induction current is used for determining the displacement of the vibration unit along the vibration direction;
the driving circuit is used for acquiring a first induction current generated by the displacement determining component at a first moment when the vibration unit vibrates;
acquiring a second induced current generated by the displacement determining component at a second time after the first time;
and determining the displacement variation of the vibration unit in the vibration direction according to the first induction current and the second induction current.
In the embodiment of the present application,
the driving circuit is further used for determining that the vibration unit is in a starting vibration state or a stopping vibration state according to the first induction current and the second induction current;
when the vibration unit is in a vibration starting state, determining the magnitude of a first driving signal according to the displacement variation, and applying the first driving signal to a ferrite coil in the linear motor to enable the ferrite coil to generate the same polarity as a second magnet for driving the vibration unit to vibrate so as to accelerate the vibration starting speed of the vibration unit;
when the vibration unit is in a vibration stopping state, the size of a second driving signal is determined according to the displacement variation, and the second driving signal is applied to the ferrite coil, so that the ferrite coil generates a polarity opposite to that of the second magnet, and the vibration stopping speed of the vibration unit is accelerated.
The embodiment of the application provides a control method of a linear motor, the linear motor, a drive circuit and an electronic device, wherein the linear motor comprises: a housing; a vibration unit located within the housing, at least two displacement determining assemblies, wherein each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit; when the vibration unit vibrates, the induction coil and the first magnet act together to generate induction current, the induction current is used for determining the displacement of the vibration unit in the vibration direction, so that the driving waveform of the linear motor can be adjusted according to the displacement of the vibration unit determined by the induction current, and therefore rapid vibration starting and stopping are achieved, and the problem of device discreteness caused by inconsistent damping is avoided.
Drawings
FIG. 1 is a first schematic structural diagram of a linear motor according to an embodiment of the present invention;
FIG. 2 is a second schematic structural diagram of a linear motor according to an embodiment of the present invention;
FIG. 3 is a third schematic structural diagram of a linear motor according to an embodiment of the present invention;
fig. 4A is a first flowchart illustrating a control method of a linear motor according to an embodiment of the present disclosure;
fig. 4B is a schematic flow chart illustrating an implementation of the control method of the linear motor according to the embodiment of the present application;
FIG. 5A is a first schematic structural diagram of a driving circuit according to an embodiment of the present disclosure;
FIG. 5B is a second schematic structural diagram of a driving circuit according to an embodiment of the present disclosure;
fig. 6A is a schematic structural diagram of a linear motor according to an embodiment of the present invention;
FIG. 6B is a schematic structural diagram of a detection circuit according to an embodiment of the present disclosure;
FIG. 6C is a schematic diagram of a vibration waveform of the linear motor according to the embodiment of the present application;
FIG. 6D is a schematic flow chart illustrating an implementation of a closed-loop control method for a linear motor according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, specific technical solutions of the present application will be described in further detail below with reference to the accompanying drawings in the embodiments of the present application. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the application.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.
It should be noted that the terms "first \ second \ third" referred to in the embodiments of the present application are only used for distinguishing similar objects and do not represent a specific ordering for the objects, and it should be understood that "first \ second \ third" may be interchanged under specific ordering or sequence if allowed, so that the embodiments of the present application described herein can be implemented in other orders than illustrated or described herein.
An embodiment of the present invention provides a linear motor, fig. 1 is a schematic structural diagram of the linear motor according to the embodiment of the present invention, and as shown in fig. 1, the linear motor 100 includes:
a housing 101;
a vibration unit 102, at least two displacement determining assemblies 103 located within the housing, wherein each displacement determining assembly 103 comprises an induction coil 1031 and a first magnet 1032;
here, each of the displacement determining members may be formed of an induction coil and a first magnet. The vibration unit refers to a unit that vibrates the linear motor.
Each of the displacement determining members 103 is provided along opposite sides of the vibration direction of the vibration unit 102;
for example, the linear motor may comprise two displacement determining assemblies, each of which is formed by an induction coil and a first magnet. And, the vibration unit in the linear motor vibrates in the left-right direction, the induction coil and the first magnet in the first displacement determining assembly are located at the left side of the vibration unit, and the induction coil and the first magnet in the second displacement determining assembly are located at the right side of the vibration unit.
Wherein, when the vibration unit 102 vibrates, the induction coil 1031 cooperates with the first magnet 1032 to generate an induction current, and the induction current is used for determining the displacement of the vibration unit 102 in the vibration direction.
Here, assuming that the vibration unit in the linear motor vibrates in the left and right directions, the first magnet may be fixedly connected to the vibration unit and disposed at left and right sides of the vibration unit. The induction coil may be connected to the case and disposed at left and right sides of the vibration unit. In this way, when the vibration unit vibrates, the first magnet also moves along with the vibration of the vibration unit, and according to the electromagnetic induction principle, the first magnet can generate an induced current with the induction coil in the moving process.
Further, as the stroke of the vibration unit is increased, the first magnet is closer to the induction coil, the intensity of magnetic induction generated is increased, and the induced current induced by the induction coil is increased. Conversely, when the stroke of the vibration unit is smaller, the first magnet is farther from the induction coil, the generated magnetic induction intensity is weaker, and the induced current induced by the induction coil is smaller. Therefore, when the vibration unit vibrates, the displacement of the vibration unit in the vibration direction can be determined by the induced current generated by the induction coil and the first magnet in cooperation.
The linear motor provided by the embodiment of the application comprises: a housing; a vibration unit located within the housing, at least two displacement determining assemblies, wherein each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit; when the vibration unit vibrates, the induction coil and the first magnet act together to generate induction current, the induction current is used for determining the displacement of the vibration unit in the vibration direction, so that the driving waveform of the linear motor can be adjusted according to the displacement of the vibration unit determined by the induction current, and therefore rapid vibration starting and stopping are achieved, and the problem of device discreteness caused by inconsistent damping is avoided.
Based on the foregoing embodiments, the present application further provides a linear motor, including:
a housing;
a vibration unit, a driving coil, a spring, and at least two displacement determining assemblies within the housing, wherein each displacement determining assembly includes an induction coil and a first magnet;
the vibration unit is connected with the shell through the spring, and when the driving coil is electrified, the vibration unit vibrates in the shell through the spring;
here, when the driving coil is energized, the driving coil can vibrate the vibration unit in the housing through the spring according to the principle of electromagnetic generation.
Each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit;
when the vibration unit vibrates, the induction coil and the first magnet act together to generate induction current, and the induction current is used for determining the displacement of the vibration unit in the vibration direction.
Based on the foregoing embodiments, a linear motor is further provided in the embodiments of the present application, fig. 2 is a schematic structural diagram of a linear motor in the embodiments of the present application, and as shown in fig. 2, the linear motor 200 includes:
a housing 201;
a vibration unit 202, a driving coil 203, a spring 204, and at least two displacement determining assemblies 205 located within the housing, wherein each displacement determining assembly 205 includes an induction coil 2051 and a first magnet 2052;
the vibration unit 202 is connected to the housing 201 through the spring 204, and when the driving coil 203 is energized, the vibration unit 202 vibrates in the housing 201 through the spring 204;
each of the displacement determining members 205 is disposed along opposite sides of the vibration direction of the vibration unit 202;
wherein, when the vibration unit 202 vibrates, the induction coil 2051 cooperates with the first magnet 2052 to generate an induction current, which is used for determining the displacement of the vibration unit 202 in the vibration direction;
wherein the vibration unit 202 includes: a mass 2021 and a second magnet 2022;
here, the vibration unit may include a mass and second magnets, and the second magnets may be fixed to opposite sides of the mass. The mass is used for vibrating inside the linear motor. The second magnet is used for providing power for driving the mass block to vibrate.
The second magnet 2022 acts on the driving coil 203 to deform the spring 204; the mass 2021 vibrates inside the housing 201 by the deformation of the spring 204;
here, when the driving coil is energized, the driving coil generates the same or opposite polarity as the second magnet by the principle of electromagnetic induction to promote the movement of the second magnet by the principle of like-pole attraction and opposite-pole repulsion of the magnets. Therefore, when the second magnet moves, the spring connected with the second magnet can deform, and therefore the mass block can vibrate in the shell through the deformation of the spring.
Correspondingly, when the mass 2021 vibrates, the induction coil 2051 and the first magnet 2052 act to generate an induction current.
Here, when the mass vibrates, the induction coil acts with the first magnet to generate an induction current for determining displacement of the mass in a vibration direction thereof.
In some embodiments, the magnetic induction line direction of each first magnet is the same;
in the embodiment of the application, the mass block vibrates along two opposite directions, so that two sides of the mass block can be respectively provided with a plurality of first magnets and second magnets with the same number. And the magnetic induction line direction of each first magnet is the same, and the magnetic induction line direction of each second magnet is the same.
The magnetic induction line direction of each first magnet is perpendicular to the magnetic induction line direction of each second magnet.
In an embodiment of the present application, the first magnets are configured to generate an induced current that determines a displacement of the mass block in cooperation with an induction coil, and the second magnets are configured to vibrate the mass block, so that a direction of a magnetic induction line of each of the first magnets is perpendicular to a direction of a magnetic induction line of each of the second magnets.
The linear motor provided by the embodiment of the application comprises: a housing; a vibration unit, a driving coil, a spring, and at least two displacement determining assemblies within the housing, wherein each displacement determining assembly includes an induction coil and a first magnet; the vibration unit is connected with the shell through the spring, and when the driving coil is electrified, the vibration unit vibrates in the shell through the spring; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit; when the vibration unit vibrates, the induction coil and the first magnet act together to generate induction current, and the induction current is used for determining the displacement of the vibration unit in the vibration direction; wherein the vibration unit includes: a mass and a second magnet; the second magnet acts with the driving coil to deform the spring; the mass block vibrates in the shell through the deformation of the spring; correspondingly, when the quality piece vibrates, induction coil with first magnet effect produces induced current, so, can be according to through the displacement of the quality piece that induced current confirmed adjusts linear motor's drive waveform to realize quick start-up, stop shaking, and then avoid the device discreteness problem that the damping is inconsistent brings.
Based on the foregoing embodiments, a linear motor is further provided in the embodiments of the present application, fig. 3 is a schematic structural diagram three of the linear motor in the embodiments of the present application, and as shown in fig. 3, the linear motor 300 includes:
a housing 301;
a vibration unit 302, at least two displacement determining assemblies 303 located within said housing, wherein each of said displacement determining assemblies 303 comprises an induction coil 3031 and a first magnet 3032;
each of the displacement determining members 303, provided along opposite sides of the vibration direction of the vibration unit 302;
wherein, when the vibration unit 302 vibrates, the induction coil 3031 and the first magnet 3032 cooperate to generate induction current, and the induction current is used for determining the displacement of the vibration unit 302 in the vibration direction;
a drive coil 304 and a spring 305 within the housing, wherein;
the vibration unit 302 is connected to the housing 301 through the spring 305, and when the driving coil 304 is energized, the vibration unit 302 vibrates in the housing 301 through the spring 305;
the vibration unit 302 includes:
a mass 3021 and a second magnet 3022;
wherein the second magnet 3022 acts on the driving coil 304 to deform the spring 305; the mass 3021 vibrates in the housing 301 by the deformation of the spring 305;
correspondingly, when the mass 3021 vibrates, the induction coil 3031 and the first magnet 3032 act to generate an induction current;
a ferrite coil 306 located within the housing, wherein;
when the linear motor is in a starting state, the ferrite coil 306 generates a polarity opposite to that of the second magnet 3022 according to the received first driving signal, so as to accelerate the starting speed of the linear motor;
in the embodiment of the application, the ferrite coil in the housing is used for receiving a driving signal generated by a driving circuit corresponding to the linear motor and generating the same or opposite polarity to the second magnet so as to accelerate the starting vibration speed or stopping vibration speed of the linear motor. When the current directions of the driving signals are different, the polarities generated by the ferrite coils are also different.
When the linear motor is in a vibration-stopping state, the ferrite coil 306 generates the same polarity as the second magnet 3022 according to the received second driving signal, so as to accelerate the vibration-stopping speed of the linear motor;
wherein the magnitudes of the first and second driving signals are determined according to the displacement of the mass 3021 in the vibration direction.
For example, if the first induced current detected by the driving circuit at a first time is smaller than the second induced current detected by the driving circuit at a second time, the linear motor is in the oscillation starting stage, and the driving circuit applies a driving signal in the same direction to the ferrite coil to generate a polarity opposite to that of the second magnet, so as to accelerate the oscillation starting speed of the linear motor. Meanwhile, the mass determined by the first induction current and the second induction current can improve the same-direction driving signal if the displacement variation of the vibration direction is small, and can reduce the same-direction driving signal if the displacement variation is large.
For example, if the driving circuit detects a first induced current on the induction coil at a first time greater than a second induced current on the induction coil at a second time later, the linear motor is in a vibration-off phase, and the driving circuit applies a reverse driving signal to the ferrite coil to generate the same polarity as the second magnet, so as to accelerate the vibration-off speed of the linear motor. Meanwhile, if the displacement variation of the mass determined by the first induction current and the second induction current in the vibration direction is smaller, the reverse driving signal can be increased, and if the displacement variation is larger, the reverse driving signal can be decreased.
Of course, a precondition for applying the drive signal to the ferrite coil is that the drive signal does not reach the upper limit of the tolerance of the linear motor.
In some embodiments, the magnetic induction line direction of each first magnet is the same;
the magnetic induction line direction of each first magnet is perpendicular to the magnetic induction line direction of each second magnet.
The linear motor provided by the embodiment of the application comprises: a housing; a vibration unit located within the housing, at least two displacement determining assemblies, wherein each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit; when the vibration unit vibrates, the induction coil and the first magnet act together to generate induction current, and the induction current is used for determining the displacement of the vibration unit in the vibration direction; a drive coil and a spring within the housing, wherein; the vibration unit is connected with the shell through the spring, and when the driving coil is electrified, the vibration unit vibrates in the shell through the spring; the vibration unit includes: a mass and a second magnet; wherein the second magnet acts on the drive coil to deform the spring; the mass block vibrates in the shell through the deformation of the spring; correspondingly, when the mass block vibrates, the induction coil and the first magnet act to generate induction current; a ferrite coil positioned within the housing, wherein; when the linear motor is in a starting oscillation state, the ferrite coil generates a polarity opposite to that of the second magnet according to a received first driving signal so as to accelerate the starting oscillation speed of the linear motor; when the linear motor is in a vibration stopping state, the ferrite coil generates the same polarity as the second magnet according to a received second driving signal so as to accelerate the vibration stopping speed of the linear motor; the sizes of the first driving signal and the second driving signal are determined according to the displacement of the mass block along the vibration direction, so that the direction and the size of the driving signal received by the ferrite coil can be adjusted according to the displacement of the mass block determined through the induced current, and the polarity identical to or opposite to that of the second magnet is generated, so that the vibration starting or stopping speed of the linear motor is accelerated, and the problem of device discreteness caused by inconsistent damping is avoided.
Based on the foregoing embodiments, an embodiment of the present application provides a control method for a linear motor, where the control method can be applied to the above-mentioned linear motor, and fig. 4A is a first schematic flow chart illustrating an implementation of the control method for the linear motor according to the embodiment of the present application, and as shown in fig. 4A, the method includes:
step S401, when a vibration unit in the linear motor vibrates, acquiring a first induction current generated by a displacement determining component in the linear motor at a first moment; the linear motor comprises at least two displacement determining assemblies, each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit;
step S402, acquiring a second induced current generated by the displacement determining component at a second moment after the first moment;
and step S403, determining a displacement variation of the vibration unit in the vibration direction according to the first induced current and the second induced current.
Based on the foregoing embodiments, an embodiment of the present application further provides a control method for a linear motor, where the control method can be applied to the above-mentioned linear motor, and fig. 4B is a schematic diagram of an implementation flow of the control method for a linear motor according to the embodiment of the present application, and as shown in fig. 4B, the method includes:
step S411, when a vibration unit in the linear motor vibrates, acquiring a first induction current generated by a displacement determining component in the linear motor at a first moment; the linear motor comprises at least two displacement determining assemblies, each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit;
step S412, obtaining a second induced current generated by the displacement determining component at a second time after the first time;
step S413, determining a displacement variation of the vibration unit in the vibration direction according to the first induced current and the second induced current;
step S414, determining that the vibration unit is in a starting vibration state or a stopping vibration state according to the first induction current and the second induction current;
in some embodiments, the step S414 of determining that the vibration unit is in the start state or the stop state according to the first induced current and the second induced current may be implemented by:
step S4141, determining that the vibration unit is in a vibration starting state when the second induced current is greater than the first induced current;
step S4142, determining that the vibration unit is in a vibration-stopped state when the second induced current is smaller than the first induced current.
Step S415, when the vibration unit is in a vibration starting state, determining a magnitude of a first driving signal according to the displacement variation, and applying the first driving signal to a ferrite coil in the linear motor to make the ferrite coil generate a polarity same as that of a second magnet driving the vibration unit to vibrate, so as to increase a vibration starting speed of the vibration unit;
and step S416, when the vibration unit is in a vibration stopping state, determining the magnitude of a second driving signal according to the displacement variation, and applying the second driving signal to the ferrite coil to enable the ferrite coil to generate a polarity opposite to that of the second magnet, so as to accelerate the vibration stopping speed of the vibration unit.
Based on the foregoing embodiments, an embodiment of the present application provides a driving circuit, which may be a driving circuit corresponding to the linear motor, and fig. 5A is a first structural schematic diagram of the driving circuit according to the embodiment of the present application, as shown in fig. 5A, the driving circuit 50 includes:
a current obtaining module 51, configured to obtain a first induced current generated by a displacement determining component in the linear motor at a first time when a vibration unit in the linear motor vibrates; the linear motor comprises at least two displacement determining assemblies, each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit;
the current obtaining module 51 is further configured to obtain a second induced current generated by the displacement determining component at a second time after the first time;
a displacement determining module 52, configured to determine a displacement variation of the vibration unit in the vibration direction according to the first induced current and the second induced current.
The drive circuit that this application embodiment provided includes: the current acquisition module is used for acquiring a first induction current generated by a displacement determination assembly in the linear motor at a first moment when a vibration unit in the linear motor vibrates; the linear motor comprises at least two displacement determining assemblies, each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit; the current acquisition module is further used for acquiring a second induced current generated by the displacement determination component at a second moment after the first moment; the displacement determining module is used for determining the displacement variation of the vibration unit in the vibration direction according to the first induced current and the second induced current, so that the induced currents generated by the induction coil at different moments can be obtained through the driving circuit, the displacement variation of the vibration unit is determined according to the induced currents at different moments, and therefore the size and the direction of a driving signal of the linear motor are adjusted according to the displacement variation, quick start vibration and stop vibration are achieved, and the problem of device discreteness caused by inconsistent damping is avoided.
Based on the foregoing embodiments, an embodiment of the present invention further provides a driving circuit, where the driving circuit may be a driving circuit corresponding to the linear motor, and fig. 5B is a schematic structural diagram of the driving circuit according to the embodiment of the present invention, and as shown in fig. 5B, the driving circuit 500 includes:
a current obtaining module 501, configured to obtain a first induced current generated by a displacement determining component in the linear motor at a first time when a vibration unit in the linear motor vibrates; the linear motor comprises at least two displacement determining assemblies, each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit;
the current obtaining module 501 is further configured to obtain a second induced current generated by the displacement determining component at a second time after the first time;
a displacement determining module 502, configured to determine a displacement variation of the vibration unit in the vibration direction according to the first induced current and the second induced current;
a state determining module 503, configured to determine that the vibration unit is in a start-up state or a stop-vibration state according to the first induced current and the second induced current;
a processing module 504, configured to determine a magnitude of a first driving signal according to the displacement variation when the vibration unit is in a vibration starting state, and apply the first driving signal to a ferrite coil in the linear motor, so that the ferrite coil generates a polarity that is the same as that of a second magnet that drives the vibration unit to vibrate, so as to accelerate a vibration starting speed of the vibration unit;
the processing module 504 is further configured to determine a magnitude of a second driving signal according to the displacement variation when the vibration unit is in a vibration-off state, and apply the second driving signal to the ferrite coil, so that the ferrite coil generates a polarity opposite to that of the second magnet, thereby increasing a vibration-off speed of the vibration unit.
Based on the foregoing embodiments, a linear motor is further provided in the embodiments of the present application, and fig. 6A is a schematic structural diagram of the linear motor in the embodiments of the present application, as shown in fig. 6A, the linear motor 60 includes:
a housing 61, and a spring 62, a foam damper 63, a drive coil 64, a mass 65, and a second magnet 66 located within the housing.
The mass 65 is fixedly connected to the second magnet 66, and the spring 62 is located between the mass 65 and the housing 61.
The driving coil 64 generates the same or opposite polarity as the second magnet 66 under the action of the ac signal, so that the second magnet 66 is moved repeatedly in the reference direction in the figure. Thereby causing the spring 62 to deform and the mass 65 to vibrate within the housing through the deformation of the spring 62.
The linear motor 60 further includes: an induction coil 67, a first magnet 68 and a ferrite coil 69 located within the housing.
The first magnet 68 is fixedly connected to the mass block 65, and a magnetic induction line direction of the first magnet 68 is perpendicular to a magnetic induction line direction of the second magnet 66.
When the motor vibrates, the first magnet 68 cooperates with the induction coils 67 located at both ends of the motor to generate an induction current. Therefore, the magnitude of the induced current can be detected by a corresponding detection circuit, and the magnitude of the displacement of the mass block 65 can be further judged by the magnitude of the induced current;
meanwhile, two ferrite coils 69 on the top of the motor constitute a feedback circuit with the detection circuit. The feedback circuit applies an alternating current signal (i.e., a driving signal) to the ferrite coil 69 according to the magnitude of the induced current: when the motor needs to start oscillation, the applied driving signal enables the ferrite coil 69 to generate a polarity opposite to that of the second magnet 66, so that the oscillation starting speed of the motor is accelerated; when the motor needs to stop vibrating, the applied driving signal makes the ferrite coil 69 generate the same polarity as the second magnet 66, and the braking speed of the motor is accelerated.
The linear motor provided by the embodiment of the application can avoid the difference caused by foam damping inconsistency, and the corresponding driving signals (namely, alternating current signals applied to the ferrite coil) are superposed according to actual conditions, so that better user experience can be generated.
The embodiment of the application starts from the structural design of the motor, utilizes the electromagnetic induction principle to and the principle that electricity is given birth to magnetism, monitors the actual displacement of quality piece in the inside vibration unit of motor, and according to the drive waveform that the drive circuit that the size adjustment of actual displacement corresponds produced, thereby realizes quick start-up vibration, the stop vibration of motor, and then avoids the device discreteness problem that the damping inconsistency brought in the motor.
In the embodiment of the present application, in order to realize accurate control of the linear motor, the detection circuit and the closed-loop control method are also required. The detection Circuit may be implemented using a driver IC (Integrated Circuit).
In this case, a new module (i.e., a detection circuit) may be integrated inside the driving IC to detect the induced current generated by the induction coil of the linear motor. Fig. 6B is a schematic structural diagram of a detection circuit according to an embodiment of the present application, and as shown in fig. 6B, the detection circuit 600 includes: an input 601, an impedance amplification circuit 602, an analog-to-digital converter 603, and a control unit 604. The input end 601 includes a first input end 6011 and a second input end 6012, where the first input end 6011 is configured to receive an induced current generated by the induction coil, and the second input end 6012 is configured to receive a reference current. The impedance amplifying circuit 602 is composed of a resistor 6021 and an impedance amplifier 6022. The detection circuit 600 converts the induced current generated by the induction coil inside the motor into a corresponding induced voltage by using the impedance amplification circuit 602, then converts the induced voltage into a corresponding digital grade by using the analog-to-digital converter 603, and finally feeds back the converted digital grade to the control unit 604 in the detection circuit 600, so that the drive IC can adjust the magnitude and direction of the drive signal applied to the ferrite coil of the linear motor according to the digital grade received by the control unit 604.
Fig. 6C is a schematic diagram of a vibration waveform of the linear motor according to the embodiment of the present application, and as shown in fig. 6C, a block 61 indicates a vibration starting state of the linear motor, a block 62 indicates a steady state of the linear motor, and a block 63 indicates a vibration stopping state of the linear motor.
The corresponding closed-loop control method is realized in the following way: in the starting vibration stage of the linear motor, the mass block is gradually close to the induction coils at the two ends, so that the converted digital grade of the detection circuit is an increasing process, and further the same-direction driving voltage applied to the ferrite coil can be increased in the stage, so that the linear motor is started to vibrate quickly. In the steady state stage of the linear motor, the strokes of the mass blocks are consistent each time, and the current induced by the induction coil is basically stable, so that the digital grade converted by the detection circuit is kept unchanged without processing. In the vibration stopping stage of the linear motor, the mass block is gradually far away from the induction coils at the two ends, so that the converted digital grade of the detection circuit is a descending process, and further the reverse driving voltage applied to the ferrite coil can be increased in the stage, so that the vibration of the linear motor is stopped rapidly.
Correspondingly, fig. 6D is a schematic implementation flow chart of a closed-loop control method for a linear motor according to an embodiment of the present application, and as shown in fig. 6D, the method includes:
step S601, when the linear motor vibrates, acquiring a first induction current generated by the action of an induction coil of the linear motor and a second magnet at a first moment;
step S602, acquiring a second induction current generated by the action of an induction coil of the linear motor and a second magnet at a second moment after the first moment;
step S603, converting the first induced current and the second induced current into corresponding digital levels by using a detection circuit, and determining a variation trend of the corresponding digital levels;
step S604, when the corresponding numerical grade is increased, determining that the linear motor is in a vibration starting stage;
step S605, when the linear motor is in a starting oscillation stage and the driving voltage applied to the ferrite coil is smaller than a first preset voltage, increasing the driving voltage to accelerate the starting oscillation;
step S606, when the corresponding digital grade is smaller, determining that the linear motor is in a vibration stopping stage;
and step S607, when the linear motor is in a vibration stopping stage and the driving voltage applied to the ferrite coil is less than a first preset voltage, increasing the driving voltage to accelerate vibration stopping.
Here, the electronic device adopts the linear motor structural design provided by the embodiment of the application, and the vibration feeling of the corresponding electronic device can be improved. Meanwhile, the embodiment of the application also defines and supplements an internal unit (namely a corresponding detection circuit) of the drive IC in a matching way, and supports the realization of the function of the linear motor. Meanwhile, the embodiment of the application also defines a closed-loop control method in a matching way, and the closed-loop control method and the linear motor realize the final effect together. Through the linear motor, the detection circuit and the closed-loop control method provided by the embodiment of the application, the vibration starting time and the braking time of the motor can be obviously shortened, more crisp granular sensation is obtained, and the difference caused in the motor manufacturing process is avoided, so that the consistency of the whole machine is ensured, and the user experience is greatly improved.
The linear motor with closed-loop control provided by the embodiment of the application can realize finer tactile feedback and simulate richer vibration waveforms. Thus, the linear motor provided by the embodiment of the application can be mounted on a wearable device, or mounted on a mobile terminal, or applied to a non-easy-to-operate environment (such as a vehicle scene), and provides different tactile senses for a user. Meanwhile, the touch feedback of the virtual key can be realized through the linear motor in the embodiment of the application, and the overall waterproofness of the electronic equipment is indirectly improved. Or the linear motor in the embodiment of the present application is applied to a touch pen (e.g., an apple pen).
Based on the foregoing embodiments, an electronic device is provided in the embodiments of the present application, where the electronic device is a device having a vibration function, and for example, the electronic device may be a mobile terminal (e.g., a mobile phone, a tablet computer), a wearable device (e.g., a smart watch, a bracelet), or the like. Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application, and as shown in fig. 7, the electronic device 700 includes:
a linear motor 701 and a drive circuit 702;
wherein the linear motor 701 includes: a housing; a vibration unit located within the housing, at least two displacement determining assemblies, wherein each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit;
when the vibration unit vibrates, the induction coil and the first magnet act to generate induction current, and the induction current is used for determining the displacement of the vibration unit along the vibration direction;
the driving circuit 702 is configured to obtain a first induced current generated by the displacement determining component at a first time when the vibration unit vibrates;
acquiring a second induced current generated by the displacement determining component at a second time after the first time;
and determining the displacement variation of the vibration unit in the vibration direction according to the first induction current and the second induction current.
Based on the foregoing embodiments, an embodiment of the present application further provides an electronic device, where the electronic device includes:
a linear motor and a drive circuit;
wherein the linear motor includes: a housing; a vibration unit located within the housing, at least two displacement determining assemblies, wherein each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit;
when the vibration unit vibrates, the induction coil and the first magnet act to generate induction current, and the induction current is used for determining the displacement of the vibration unit along the vibration direction;
the driving circuit is used for acquiring a first induction current generated by the displacement determining component at a first moment when the vibration unit vibrates;
acquiring a second induced current generated by the displacement determining component at a second time after the first time;
determining the displacement variation of the vibration unit in the vibration direction according to the first induction current and the second induction current;
the driving circuit is further used for determining that the vibration unit is in a starting vibration state or a stopping vibration state according to the first induction current and the second induction current;
when the vibration unit is in a vibration starting state, determining the magnitude of a first driving signal according to the displacement variation, and applying the first driving signal to a ferrite coil in the linear motor to enable the ferrite coil to generate the same polarity as a second magnet for driving the vibration unit to vibrate so as to accelerate the vibration starting speed of the vibration unit;
when the vibration unit is in a vibration stopping state, the size of a second driving signal is determined according to the displacement variation, and the second driving signal is applied to the ferrite coil, so that the ferrite coil generates a polarity opposite to that of the second magnet, and the vibration stopping speed of the vibration unit is accelerated.
Here, it should be noted that: the above description of the method, circuit, and electronic device embodiments is similar to the above description of the motor embodiments, with similar beneficial effects as the motor embodiments. For technical details not disclosed in the embodiments of the method, circuit and electronic device of the present application, please refer to the description of the embodiments of the motor of the present application for understanding.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
It should be noted that, in this document, 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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The methods disclosed in the several method embodiments provided in the present application may be combined arbitrarily without conflict to obtain new method embodiments.
Features disclosed in several of the product embodiments provided in the present application may be combined in any combination to yield new product embodiments without conflict.
The features disclosed in the several method or apparatus embodiments provided in the present application may be combined arbitrarily, without conflict, to arrive at new method embodiments or apparatus embodiments.
The above description is only for the embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (12)
1. A linear motor, characterized in that the linear motor comprises:
a housing;
a vibration unit located within the housing, at least two displacement determining assemblies, wherein each displacement determining assembly comprises an induction coil and a first magnet;
each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit;
when the vibration unit vibrates, the induction coil and the first magnet act together to generate induction current, and the induction current is used for determining the displacement of the vibration unit in the vibration direction.
2. The linear motor according to claim 1, further comprising:
a drive coil and a spring within the housing, wherein;
the vibration unit is connected with the shell through the spring, and when the driving coil is electrified, the vibration unit vibrates in the shell through the spring.
3. The linear motor according to claim 2, wherein the vibration unit comprises:
a mass and a second magnet;
wherein the second magnet acts on the drive coil to deform the spring; the mass block vibrates in the shell through the deformation of the spring;
correspondingly, when the mass block vibrates, the induction coil and the first magnet act to generate induction current.
4. The linear motor according to claim 3, further comprising:
a ferrite coil positioned within the housing, wherein;
when the linear motor is in a starting oscillation state, the ferrite coil generates a polarity opposite to that of the second magnet according to a received first driving signal so as to accelerate the starting oscillation speed of the linear motor;
when the linear motor is in a vibration stopping state, the ferrite coil generates the same polarity as the second magnet according to a received second driving signal so as to accelerate the vibration stopping speed of the linear motor;
wherein the magnitudes of the first and second drive signals are determined according to the displacement of the mass in the vibration direction.
5. Linear motor according to claim 3 or 4,
the magnetic induction line directions of the first magnets are the same;
the magnetic induction line direction of each first magnet is perpendicular to the magnetic induction line direction of each second magnet.
6. A method of controlling a linear motor, the method comprising:
when a vibration unit in the linear motor vibrates, acquiring a first induction current generated by a displacement determining component in the linear motor at a first moment; the linear motor comprises at least two displacement determining assemblies, each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit;
acquiring a second induced current generated by the displacement determining component at a second time after the first time;
and determining the displacement variation of the vibration unit in the vibration direction according to the first induction current and the second induction current.
7. The control method according to claim 6, characterized in that the method further comprises:
determining that the vibration unit is in a starting vibration state or a stopping vibration state according to the first induction current and the second induction current;
when the vibration unit is in a vibration starting state, determining the magnitude of a first driving signal according to the displacement variation, and applying the first driving signal to a ferrite coil in the linear motor to enable the ferrite coil to generate the same polarity as a second magnet for driving the vibration unit to vibrate so as to accelerate the vibration starting speed of the vibration unit;
when the vibration unit is in a vibration stopping state, the size of a second driving signal is determined according to the displacement variation, and the second driving signal is applied to the ferrite coil, so that the ferrite coil generates a polarity opposite to that of the second magnet, and the vibration stopping speed of the vibration unit is accelerated.
8. The control method of claim 7, wherein the determining that the vibratory unit is in a start-up state or a stop state based on the first induced current and the second induced current comprises:
when the second induced current is larger than the first induced current, determining that the vibration unit is in a vibration starting state;
and when the second induced current is smaller than the first induced current, determining that the vibration unit is in a vibration stopping state.
9. A driver circuit, characterized in that the driver circuit comprises:
the current acquisition module is used for acquiring a first induction current generated by a displacement determination assembly in the linear motor at a first moment when a vibration unit in the linear motor vibrates; the linear motor comprises at least two displacement determining assemblies, each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit;
the current acquisition module is further used for acquiring a second induced current generated by the displacement determination component at a second moment after the first moment;
and the displacement determining module is used for determining the displacement variation of the vibration unit in the vibration direction according to the first induction current and the second induction current.
10. The driving circuit according to claim 9, further comprising:
the state determining module is used for determining that the vibration unit is in a starting vibration state or a stopping vibration state according to the first induction current and the second induction current;
the processing module is used for determining the magnitude of a first driving signal according to the displacement variation when the vibration unit is in a vibration starting state, and applying the first driving signal to a ferrite coil in the linear motor to enable the ferrite coil to generate the same polarity as a second magnet for driving the vibration unit to vibrate so as to accelerate the vibration starting speed of the vibration unit;
the processing module is further configured to determine a magnitude of a second driving signal according to the displacement variation when the vibration unit is in a vibration-off state, and apply the second driving signal to the ferrite coil, so that the ferrite coil generates a polarity opposite to that of the second magnet, thereby accelerating a vibration-off speed of the vibration unit.
11. An electronic apparatus, comprising a linear motor and a drive circuit;
wherein the linear motor includes: a housing; a vibration unit located within the housing, at least two displacement determining assemblies, wherein each displacement determining assembly comprises an induction coil and a first magnet; each displacement determining assembly is arranged along two opposite sides of the vibration direction of the vibration unit;
when the vibration unit vibrates, the induction coil and the first magnet act to generate induction current, and the induction current is used for determining the displacement of the vibration unit along the vibration direction;
the driving circuit is used for acquiring a first induction current generated by the displacement determining component at a first moment when the vibration unit vibrates;
acquiring a second induced current generated by the displacement determining component at a second time after the first time;
and determining the displacement variation of the vibration unit in the vibration direction according to the first induction current and the second induction current.
12. The electronic device of claim 11,
the driving circuit is further used for determining that the vibration unit is in a starting vibration state or a stopping vibration state according to the first induction current and the second induction current;
when the vibration unit is in a vibration starting state, determining the magnitude of a first driving signal according to the displacement variation, and applying the first driving signal to a ferrite coil in the linear motor to enable the ferrite coil to generate the same polarity as a second magnet for driving the vibration unit to vibrate so as to accelerate the vibration starting speed of the vibration unit;
when the vibration unit is in a vibration stopping state, the size of a second driving signal is determined according to the displacement variation, and the second driving signal is applied to the ferrite coil, so that the ferrite coil generates a polarity opposite to that of the second magnet, and the vibration stopping speed of the vibration unit is accelerated.
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