CN107894277A - The resonant frequency measurement method of intelligent handheld device and its linear motor - Google Patents
The resonant frequency measurement method of intelligent handheld device and its linear motor Download PDFInfo
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- CN107894277A CN107894277A CN201711441080.4A CN201711441080A CN107894277A CN 107894277 A CN107894277 A CN 107894277A CN 201711441080 A CN201711441080 A CN 201711441080A CN 107894277 A CN107894277 A CN 107894277A
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- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H13/00—Measuring resonant frequency
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Abstract
The embodiment of the invention discloses a kind of intelligent handheld device and its measuring method of linear motor resonant frequency, the intelligent handheld device includes linear motor, acceleration sensor chip and driving chip, and this method includes：Using driving chip using first frequency as initial frequency, second frequency with predeterminated frequency interval, provides the drive signal of each Frequency point, and obtain under each Frequency point, the measurement data of acceleration sensor chip to linear motor successively to terminate frequency；Based under each Frequency point, the measurement data of acceleration sensor chip, Frequency point corresponding to the greatest measurement and the greatest measurement in measurement data is obtained；Frequency point corresponding to the greatest measurement is defined as to the resonant frequency of the linear motor；Wherein, the resonant frequency of linear motor is located in the range of first frequency to second frequency.This method can measure the resonant frequency of the linear motor so that during normal work, the linear motor can be operated near its resonant frequency.
Description
Technical field
The present invention relates to motor technologies field, more particularly to the resonant frequency of a kind of intelligent handheld device and its linear motor
Measuring method.
Background technology
For the attention to Consumer's Experience, linear motor is as the motor technologies in mobile phone of new generation gradually by cell phone manufacturer
Accreditation.Specifically, vibrations can not only be produced using the intelligent handheld device of linear motor, moreover it is possible to amplitude and frequency are controlled,
So as to produce strong and weak clearly demarcated and very quietly vibration, it might even be possible to simulate heartbeat that frequency vibration effect fluctuated
Fruit.Therefore, except applied to the core component on mobile phone as touch feedback, linear motor is in wearable device, game machine control
Outstanding touch feedback effect can be also provided on the intelligent handheld devices such as device, virtual reality somatosensory handle and sensor glove processed
Fruit.
At present, linear motor is mainly a spring system being made up of spring, mass and coil, wherein, spring will
Coil is suspended in inside linear motor, and coil is connected with magnetic mass.During specific works, when there is electric current stream in coil
Out-of-date, coil can produce magnetic field, accordingly, when the electric current for flowing through coil changes, the direction in corresponding magnetic field and power
Also can change therewith so that mass moves up and down in the magnetic field of change, so as to utilize the vibration of mass to user
Haptic effect is provided.
As shown in figure 1, Fig. 1 shows oscillation intensity of the linear motor under different vibration frequencies.It will be seen from figure 1 that
The oscillation intensity of linear motor is limited by contained spring resonant frequency, only when the frequency of drive signal is attached in resonant frequency
When near, stronger vibration, the fraction of rapid decline for deviateing (such as larger than ± 2Hz) and all causing oscillation intensity could be produced.
But existing intelligent handheld device is offset and is mechanically fixed due to foozle, component ageing, operating temperature
Reasons such as (including fixed tension, fixed error or installation site are improper), the linear motor in existing intelligent handheld device are usual
It can not be operated near resonant frequency point, have impact on the vibrating effect of linear motor.
The content of the invention
In order to solve the above technical problems, the embodiments of the invention provide a kind of resonance of linear motor in intelligent handheld device
Frequency measurement method, to measure the resonant frequency of the linear motor so that during normal work, the linear motor can work
Near its resonant frequency.
To solve the above problems, the embodiments of the invention provide following technical scheme：
The measuring method of linear motor resonant frequency in a kind of intelligent handheld device, the intelligent handheld device include linear
Motor, acceleration sensor chip and driving chip, this method include：
Using the driving chip using first frequency as initial frequency, second frequency is terminates frequency, between predeterminated frequency
Every, the drive signal of each Frequency point is provided to the linear motor successively, and obtain under each Frequency point, the acceleration passes
The measurement data of sensor chip；
Based under each Frequency point, the measurement data of the acceleration sensor chip, obtain in the measurement data
Greatest measurement and the greatest measurement corresponding to Frequency point；
Frequency point corresponding to the greatest measurement is defined as to the resonant frequency of the linear motor；
Wherein, the resonant frequency of the linear motor is located in the range of the first frequency to the second frequency.
Optionally, this method also includes：
According to the specifications that dispatch from the factory of the linear motor, the numerical value of the first frequency and the second frequency is set.
Optionally, this method also includes：
According to the measurement range of the acceleration sensor chip, the amplitude of the drive signal is set；
According to the first frequency and second frequency, the output of measurement data of the acceleration sensor chip is set frequently
Rate.
Optionally, it is described to be based under each Frequency point, the measurement data of the acceleration sensor chip, described in acquisition
Frequency point corresponding to greatest measurement and the greatest measurement in measurement data includes：
Based under each Frequency point, the measurement data of the acceleration sensor chip, each Frequency point pair is obtained
The acceleration peak value answered；
According to acceleration peak value corresponding to each Frequency point, it is determined that maximum acceleration peak value and its corresponding frequency
Point.
Optionally, it is described to be based under each Frequency point, the measurement data of the acceleration sensor chip, described in acquisition
Frequency point corresponding to greatest measurement and the greatest measurement in measurement data includes：
Based under each Frequency point, the measurement data of the acceleration sensor chip, each Frequency point pair is obtained
The acceleration average value answered；
According to acceleration average value corresponding to each Frequency point, it is determined that maximum acceleration average value and its corresponding frequency
Rate point.
Optionally, in addition to：
The resonant frequency of the linear motor is stored.
A kind of intelligent handheld device, including：
Linear motor, driving chip, acceleration sensor chip and controller, wherein, the controller is used to control institute
Driving chip is stated using first frequency as initial frequency, second frequency is terminates frequency, with predeterminated frequency interval, successively to the line
Property motor the drive signal of each Frequency point is provided, and obtain under each Frequency point, the measurement of the acceleration sensor chip
Data；
Based under each Frequency point, the measurement data of the acceleration sensor chip, obtain in the measurement data
Greatest measurement and the greatest measurement corresponding to Frequency point；
Frequency point corresponding to the greatest measurement is defined as to the resonant frequency of the linear motor；
Wherein, the resonant frequency of the linear motor is located in the range of the first frequency to the second frequency.
Optionally, the controller is additionally operable to the specifications that dispatch from the factory according to the linear motor, sets the first frequency
With the numerical value of the second frequency；And/or
According to the measurement range of the acceleration sensor chip, the amplitude of the drive signal is set；And/or
According to the first frequency and second frequency, the output of measurement data of the acceleration sensor chip is set frequently
Rate.
Optionally, the controller is in the case where performing based on each Frequency point, the measurement of the acceleration sensor chip
Data, specifically used when obtaining Frequency point corresponding to the greatest measurement in the measurement data and the greatest measurement
In：
Based under each Frequency point, the measurement data of the acceleration sensor chip, each Frequency point pair is obtained
The acceleration peak value answered；
According to acceleration peak value corresponding to each Frequency point, it is determined that maximum acceleration peak value and its corresponding frequency
Point.
Optionally, the controller is in the case where performing based on each Frequency point, the measurement of the acceleration sensor chip
Data, obtain the greatest measurement in the measurement data and the greatest measurement corresponding to Frequency point be specifically used for：
Based under each Frequency point, the measurement data of the acceleration sensor chip, each Frequency point pair is obtained
The acceleration average value answered；
According to acceleration average value corresponding to each Frequency point, it is determined that maximum acceleration average value and its corresponding frequency
Rate point.
Optionally, in addition to storage device, the controller be additionally operable to by the resonant frequency of the linear motor store to
The storage device.
Compared with prior art, above-mentioned technical proposal has advantages below：
The technical scheme that the embodiment of the present invention is provided, can be by traveling through the first frequency to the second frequency model
Interior each Frequency point is enclosed, obtains the acceleration of the linear motor at each Frequency point, so as to obtain first frequency to second frequency model
The maximum vibration amplitude of the interior linear motor is enclosed, to obtain the resonant frequency of the linear motor, method is simple.Moreover, this
The measuring method of linear motor resonant frequency in the intelligent handheld device that inventive embodiments are provided, without extra measuring apparatus
And system, the directly driving chip and acceleration sensor chip using the intelligent handheld device in itself, cost are relatively low.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is oscillation intensity schematic diagram of the linear motor under different vibration frequencies；
The measurement side of the resonant frequency of linear motor in the intelligent handheld device that Fig. 2 is provided by one embodiment of the invention
Method flow chart；
The measurement of the resonant frequency of linear motor in the intelligent handheld device that Fig. 3 is provided by another embodiment of the present invention
Method flow diagram；
The structural representation for the intelligent handheld device that Fig. 4 is provided by one embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still the present invention can be with
It is different from other manner described here using other to implement, those skilled in the art can be without prejudice to intension of the present invention
In the case of do similar popularization, therefore the present invention is not limited by following public specific embodiment.
Just as described in the background section, the linear motor in existing intelligent handheld device generally can not be operated in resonance frequency
On near rate point, the vibrating effect of linear motor have impact on.
In view of this, the embodiments of the invention provide a kind of measurement side of linear motor resonant frequency in intelligent handheld device
Method, the intelligent handheld device includes linear motor, acceleration sensor chip and driving chip, as shown in Fig. 2 this method bag
Include：
S1：Using the driving chip using first frequency as initial frequency, second frequency is terminates frequency, with predeterminated frequency
Interval, provides the drive signal of each Frequency point to the linear motor successively, and obtains under each Frequency point, the acceleration
The measurement data of sensor chip.Wherein, the resonant frequency of the linear motor is located at the first frequency to the described second frequency
In the range of rate.
Because linear motor can produce vibration under the drive signal of given frequency, so as to produce the acceleration of given frequency
Degree, and the linear motor and the acceleration sensor chip are located in same intelligent handheld device, therefore, the linear horse
Up to when driving the intelligent handheld device to vibrate, the acceleration sensor chip can detect acceleration, and described
Intelligent handheld device is identical with Frequency point corresponding to the linear motor peak acceleration.
It should be noted that in embodiments of the present invention, the drive signal can be sinusoidal signal, or square wave
Signal, can also be the square-wave signal after LPF, and the present invention is not limited this, specifically depended on the circumstances.Below with
The drive signal is exemplified by sinusoidal signal, the measuring method provided the embodiment of the present invention illustrates.
On the basis of above-described embodiment, in one embodiment of the invention, this method is utilizing the driving chip
Using first frequency as initial frequency, second frequency, with predeterminated frequency interval, provides to the linear motor successively to terminate frequency
Also include before the drive signal of each Frequency point：According to the specifications that dispatch from the factory of the linear motor, set the first frequency and
The numerical value of the second frequency.
Specifically, in one embodiment of the invention, in the specifications that dispatch from the factory of the linear motor, the linear horse
The resonant frequency reached is f0, and deviation is ± 5Hz, then the first frequency is f0-20Hz, and the second frequency is f0+20Hz；
In the other embodiment of the present invention, the first frequency and the second frequency can also be other numerical value, it is of the invention to this simultaneously
Do not limit, as long as f0 ± deviations are completely covered in the frequency range of the first frequency to the second frequency.
On the basis of above-described embodiment, in an alternate embodiment of the present invention where, the predeterminated frequency interval can be with
For 0.5Hz, or 1Hz or other numerical value, the present invention are not limited this, specifically depended on the circumstances.
Specifically, on the basis of any of the above-described embodiment, in one embodiment of the invention, the second frequency is big
In first frequency, as shown in figure 3, in the present embodiment, using the driving chip using first frequency as initial frequency, the second frequency
Rate with predeterminated frequency interval, provides the drive signal of each Frequency point, and obtain each to the linear motor successively to terminate frequency
Under the Frequency point, the measurement data of the acceleration sensor chip includes：
S101：The drive signal of first frequency is provided using the driving chip to the linear motor, obtains described the
Under one frequency, the measurement data of the acceleration sensor chip；
S102：Increase the frequency values of the drive signal of the driving chip output with predeterminated frequency interval, obtain current frequency
Under rate, the measurement data of the acceleration sensor chip；
S103：Judge whether the current frequency is more than second frequency, when the current frequency is believed no more than second frequency
Number when, return perform S102, when the current frequency is more than second frequency, execution S104；
S104：Stop providing drive signal to the linear motor using the driving chip, handle measurement data, that is, hold
The follow-up S2-S3 of row.
It should be noted that in other embodiments of the invention, the first frequency can also be more than the described second frequency
Rate, the predeterminated frequency are not limited this, specifically depended on the circumstances at intervals of negative value, the present invention.
On the basis of any of the above-described embodiment, in one embodiment of the invention, this method also includes：According to described
The measurement range of acceleration sensor chip, the amplitude of the drive signal is set.It should be noted that in the embodiment of the present invention
In, the amplitude of the drive signal could be arranged to 2V to 8V or higher.Because different acceleration sensor chips can
The vibration acceleration value detected may be different, and therefore, this is not limited by the present invention, and the amplitude of the specific drive signal can
With depending on the vibration acceleration value that is able to detect that according to the acceleration sensor chip, as long as ensureing the linear motor
Maximum vibration acceleration magnitude is located in the measurement range of the acceleration sensor chip.
It should be noted that in embodiments of the present invention, in order to improve the accuracy of the measuring method, each frequency
Under point, the amplitude of the drive signal is identical.
On the basis of above-described embodiment, in one embodiment of the invention, this method also includes：The acceleration is set
The Measurement Resolution and output data frequency of sensor chip are spent, wherein, the Measurement Resolution of the acceleration sensor chip
Typically determined by the digit of its output data, usually 12 or 14, the present invention is not limited this, specifically optionally
Depending on.
Specifically, on the basis of above-described embodiment, in one embodiment of the invention, can be according to the described first frequency
Rate and second frequency, output frequency (the i.e. described acceleration transducer of the measurement data of the acceleration sensor chip is set
The refreshing frequency of the output data of chip), the resonant frequency of linear motor is described to add between 150Hz to 260Hz as described in working as
The refreshing frequency of the output data of velocity sensor chip more preferably greater than twice of 260Hz, can typically choose 800Hz or
1600Hz, but the present invention is not limited this, is specifically depended on the circumstances.
It should be noted that the refreshing frequency of the output data of the acceleration sensor chip is higher, the acceleration
The renewal of the output data of sensor chip is faster, and the power consumption of the acceleration sensor chip is bigger；The acceleration sensing
The refreshing frequency of the output data of device chip is lower, and the renewal of the output data of the acceleration sensor chip is slower, described
The power consumption of acceleration sensor chip is smaller.Because the Measurement Resolution of the acceleration sensor chip is higher, it is measured
Acceleration magnitude it is more accurate, therefore, in embodiments of the present invention, do not influenceing the output data of the acceleration sensor chip
Refreshing frequency on the premise of, the Measurement Resolution of the acceleration sensor chip is the higher the better.
S2：Based under each Frequency point, the measurement data of the acceleration sensor chip, the measurement data is obtained
In greatest measurement and the greatest measurement corresponding to Frequency point.
When the drive signal is sinusoidal signal or square-wave signal, due in same period, the drive signal
Oscillation Amplitude can change, and the vibration acceleration of the linear motor changes with the change of the drive signal, accordingly
, the data of the acceleration sensor chip output can also change with the change of the vibration acceleration of the linear motor,
Therefore, it is in one embodiment of the invention, described to be based under each Frequency point on the basis of above-described embodiment, it is described
The measurement data of acceleration sensor chip, obtain greatest measurement and the greatest measurement in the measurement data
Corresponding Frequency point includes：
Based under each Frequency point, the measurement data of the acceleration sensor chip, each Frequency point pair is obtained
The acceleration peak value answered；
According to acceleration peak value corresponding to each Frequency point, it is determined that maximum acceleration peak value and its corresponding frequency
Point.
In another embodiment of the present invention, it is described to be based under each Frequency point, the acceleration sensor chip
Measurement data, obtain Frequency point bag corresponding to the greatest measurement and the greatest measurement in the measurement data
Include：
Based under each Frequency point, the measurement data of the acceleration sensor chip, each Frequency point pair is obtained
The acceleration average value answered；
According to acceleration average value corresponding to each Frequency point, it is determined that maximum acceleration average value and its corresponding frequency
Rate point.
S3：Frequency point corresponding to the greatest measurement is defined as to the resonant frequency of the linear motor.
On the basis of any of the above-described embodiment, in one embodiment of the invention, this method also includes：To the line
Property motor resonant frequency stored, so as in the linear motor normal work, with the resonant frequency to described linear
Motor provides drive signal.
As shown in Figure 1, the Oscillation Amplitude of the linear motor has at resonant frequency is significantly stronger than shaking for other frequencies
Dynamic amplitude, and in embodiments of the present invention, the resonant frequency of the linear motor is located at the first frequency to the described second frequency
In the range of rate, therefore, the measuring method that the embodiment of the present invention is provided can be by traveling through the first frequency to described
Each Frequency point in two frequency ranges, the acceleration of the linear motor at each Frequency point is obtained, so as to obtain first frequency to
The maximum vibration amplitude of the linear motor in two frequency ranges, to obtain the resonant frequency of the linear motor, method is simple.
Moreover, in the intelligent handheld device that the embodiment of the present invention is provided linear motor resonant frequency measuring method, nothing
Need extra measuring apparatus and system, the directly driving chip and acceleration transducer core using the intelligent handheld device in itself
Piece, cost are relatively low.
Accordingly, the embodiment of the present invention additionally provides a kind of intelligent handheld device, as shown in figure 4, the intelligent handheld device
Including：Linear motor 10, driving chip 20, acceleration sensor chip 30 and controller 40, wherein, the controller 40 is used for
The driving chip 20 is controlled using first frequency as initial frequency, second frequency is terminates frequency, with predeterminated frequency interval, successively
The drive signal of each Frequency point is provided to the linear motor 10, and is obtained under each Frequency point, the acceleration transducer
The measurement data of chip 30；
Based under each Frequency point, the measurement data of the acceleration sensor chip 30, the measurement data is obtained
In greatest measurement and the greatest measurement corresponding to Frequency point；
Frequency point corresponding to the greatest measurement is defined as to the resonant frequency of the linear motor 10；
Wherein, the resonant frequency of the linear motor 10 is located in the range of the first frequency to the second frequency.
Because linear motor can produce vibration under the drive signal of given frequency, so as to produce the acceleration of given frequency
Degree, and the linear motor and the acceleration sensor chip are located in same intelligent handheld device, therefore, the linear horse
Up to when driving the intelligent handheld device to vibrate, the acceleration sensor chip can detect acceleration.
It should be noted that in embodiments of the present invention, the drive signal can be sinusoidal signal, or square wave
Signal, can also be the square-wave signal after LPF, and the present invention is not limited this, specifically depended on the circumstances.Below with
The drive signal is exemplified by sinusoidal signal, the intelligent handheld device provided the embodiment of the present invention illustrates.
On the basis of above-described embodiment, in one embodiment of the invention, the controller is utilizing the driving
Chip is using first frequency as initial frequency, and second frequency is terminates frequency, with predeterminated frequency interval, successively to the linear motor
It is additionally operable to before the drive signal of each Frequency point is provided：According to the specifications that dispatch from the factory of the linear motor, first frequency is set
The numerical value of rate and the second frequency.
Specifically, in one embodiment of the invention, in the specifications that dispatch from the factory of the linear motor, the linear horse
The resonant frequency reached is f0, and deviation is ± 5Hz, then the first frequency is f0-20Hz, and the second frequency is f0+20Hz；
In the other embodiment of the present invention, the first frequency and the second frequency can also be other numerical value, it is of the invention to this simultaneously
Do not limit, as long as f0 ± deviations are completely covered in the frequency range of the first frequency to the second frequency.
On the basis of above-described embodiment, in an alternate embodiment of the present invention where, the predeterminated frequency interval can be with
For 0.5Hz, or 1Hz or other numerical value, the present invention are not limited this, specifically depended on the circumstances.
It should be noted that due to when inclined between the frequency of the drive signal and the resonant frequency of the linear motor
When difference is more than 2Hz, the oscillation intensity of the linear motor substantially reduces, therefore in an alternate embodiment of the present invention where, it is described
Predeterminated frequency interval is not more than 2.5Hz, preferably less than 2.5Hz.
Specifically, on the basis of any of the above-described embodiment, in one embodiment of the invention, the second frequency is big
In first frequency, the controller is being performed using the driving chip using first frequency as initial frequency, and second frequency is knot
Beam frequency, with predeterminated frequency interval, the drive signal of each Frequency point is provided to the linear motor successively, and obtain each frequency
It is specifically used under rate point, during the measurement data of the acceleration sensor chip：The linear horse is given using the driving chip
Up to the drive signal for providing first frequency, obtain under the first frequency, the measurement data of the acceleration sensor chip；With
Predeterminated frequency interval increases the frequency values of the drive signal of the driving chip output, obtains under current frequency, the acceleration
The measurement data of sensor chip；Judge whether the current frequency is more than second frequency and (judges whether to travel through first frequency
Each Frequency point in the range of to second frequency), when the current frequency is not more than second frequency signal, returns and perform S102, when
When the current frequency is more than second frequency, S104 is performed；Stop providing drive to the linear motor using the driving chip
Dynamic signal.
It should be noted that in other embodiments of the invention, the first frequency can also be more than the described second frequency
Rate, the predeterminated frequency are not limited this, specifically depended on the circumstances at intervals of negative value, the present invention.
On the basis of any of the above-described embodiment, in one embodiment of the invention, the controller is additionally operable to：According to
The measurement range of the acceleration sensor chip, the amplitude of the drive signal is set.It should be noted that of the invention real
Apply in example, the amplitude of the drive signal could be arranged to 2V to 8V or higher.Due to different acceleration sensor chips
The vibration acceleration value being able to detect that may be different, and therefore, this is not limited by the present invention, the width of the specific drive signal
Spend depending on the vibration acceleration value that can be able to detect that according to the acceleration sensor chip, as long as ensureing the linear horse
The maximum vibration acceleration magnitude reached is located in the measurement range of the acceleration sensor chip.
It should be noted that in embodiments of the present invention, the linear horse is measured in order to improve the intelligent handheld device
Up to when accuracy, under each Frequency point, the amplitude phase for the drive signal that the driving chip provides to the linear motor
Together.
On the basis of above-described embodiment, in one embodiment of the invention, the controller is additionally operable to described in setting
The Measurement Resolution and output data frequency of acceleration sensor chip, wherein, the measurement point of the acceleration sensor chip
Resolution typically determines that usually 12 or 14, the present invention is not limited this, is specifically regarded by the digit of its output data
Depending on situation.
Specifically, on the basis of above-described embodiment, in one embodiment of the invention, the controller can basis
The first frequency and second frequency, set the output frequency of the measurement data of the acceleration sensor chip (i.e. described to add
The refreshing frequency of the output data of velocity sensor chip), if the resonant frequency of the linear motor as described in is in 150Hz to 260Hz
Between, the refreshing frequency of the output data of the acceleration sensor chip can typically be chosen more preferably greater than twice of 260Hz
800Hz or 1600Hz, but the present invention is not limited this, is specifically depended on the circumstances.
It should be noted that the refreshing frequency of the output data of the acceleration sensor chip is higher, the acceleration
The renewal of the output data of sensor chip is faster, and the power consumption of the acceleration sensor chip is bigger；The acceleration sensing
The refreshing frequency of the output data of device chip is lower, and the renewal of the output data of the acceleration sensor chip is slower, described
The power consumption of acceleration sensor chip is smaller.Because the Measurement Resolution of the acceleration sensor chip is higher, it is measured
Acceleration magnitude it is more accurate, therefore, in embodiments of the present invention, do not influenceing the output data of the acceleration sensor chip
Refreshing frequency on the premise of, the Measurement Resolution of the acceleration sensor chip is the higher the better.
In embodiments of the present invention, when the drive signal is sinusoidal signal or square-wave signal, due in same period
Interior, the Oscillation Amplitude of the drive signal can change, and the vibration acceleration of the linear motor is with the drive signal
Change and change, accordingly, the data of acceleration sensor chip output can also add with the vibration of the linear motor
The change of speed and change, therefore, on the basis of above-described embodiment, in one embodiment of the invention, the controller
For based under each Frequency point, the measurement data of the acceleration sensor chip, obtaining in the measurement data
It is specifically used for corresponding to greatest measurement and the greatest measurement during Frequency point：
Based under each Frequency point, the measurement data of the acceleration sensor chip, each Frequency point pair is obtained
The acceleration peak value answered；
According to acceleration peak value corresponding to each Frequency point, it is determined that maximum acceleration peak value and its corresponding frequency
Point.
In another embodiment of the present invention, the controller is for based under each Frequency point, the acceleration
The measurement data of sensor chip is spent, the greatest measurement in the measurement data is obtained and the greatest measurement corresponds to
Frequency point be specifically used for：
Based under each Frequency point, the measurement data of the acceleration sensor chip, each Frequency point pair is obtained
The acceleration average value answered；
According to acceleration average value corresponding to each Frequency point, it is determined that maximum acceleration average value and its corresponding frequency
Rate point.
On the basis of any of the above-described embodiment, in one embodiment of the invention, the intelligent handheld device also wraps
Storage device is included, the controller is additionally operable to store the resonant frequency of the linear motor to the storage device, so that
During the linear motor normal work, drive signal is provided to the linear motor with the resonant frequency.Wherein, the storage dress
It can be the internal memory of the intelligent handheld device to put, and the present invention is not limited this, specifically depended on the circumstances.
In the intelligent handheld device that the embodiment of the present invention is provided, the driving chip supports frequency sweep function, so as to
The driving chip is controlled to travel through the first frequency to each Frequency point in the range of the second frequency using the controller, and
The acceleration of the linear motor at each Frequency point is obtained by the acceleration sensor chip, and then obtains first frequency and arrives
The maximum vibration amplitude of the linear motor, obtains the resonant frequency of the linear motor in the range of second frequency, and method is simple.
Moreover, the intelligent handheld device that the embodiment of the present invention is provided is when measuring linear motor resonant frequency, without volume
Outer measuring apparatus and system, directly it is using the intelligent handheld device driving chip in itself and acceleration sensor chip
Can, cost is relatively low.
Various pieces are described by the way of progressive in this specification, and what each some importance illustrated is and other parts
Difference, between various pieces identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
Embodiment illustrated herein is not intended to be limited to, and is to fit to consistent with principles disclosed herein and features of novelty
Most wide scope.
Claims (11)
1. the measuring method of linear motor resonant frequency in a kind of intelligent handheld device, it is characterised in that the intelligent handhold is set
Standby to include linear motor, acceleration sensor chip and driving chip, this method includes：
Using the driving chip using first frequency as initial frequency, second frequency is terminates frequency, with predeterminated frequency interval, according to
It is secondary that the drive signal of each Frequency point is provided to the linear motor, and obtain under each Frequency point, the acceleration transducer
The measurement data of chip；
Based under each Frequency point, the measurement data of the acceleration sensor chip, obtain in the measurement data most
Frequency point corresponding to big measured value and the greatest measurement；
Frequency point corresponding to the greatest measurement is defined as to the resonant frequency of the linear motor；
Wherein, the resonant frequency of the linear motor is located in the range of the first frequency to the second frequency.
2. measuring method according to claim 1, it is characterised in that this method also includes：
According to the specifications that dispatch from the factory of the linear motor, the numerical value of the first frequency and the second frequency is set.
3. measuring method according to claim 1, it is characterised in that this method also includes：
According to the measurement range of the acceleration sensor chip, the amplitude of the drive signal is set；
According to the first frequency and second frequency, the output frequency of the measurement data of the acceleration sensor chip is set.
4. measuring method according to claim 1, it is characterised in that described to be based under each Frequency point, the acceleration
The measurement data of sensor chip is spent, the greatest measurement in the measurement data is obtained and the greatest measurement corresponds to
Frequency point include：
Based under each Frequency point, the measurement data of the acceleration sensor chip, obtain corresponding to each Frequency point
Acceleration peak value；
According to acceleration peak value corresponding to each Frequency point, it is determined that maximum acceleration peak value and its corresponding Frequency point.
5. measuring method according to claim 1, it is characterised in that described to be based under each Frequency point, the acceleration
The measurement data of sensor chip is spent, the greatest measurement in the measurement data is obtained and the greatest measurement corresponds to
Frequency point include：
Based under each Frequency point, the measurement data of the acceleration sensor chip, obtain corresponding to each Frequency point
Acceleration average value；
According to acceleration average value corresponding to each Frequency point, it is determined that maximum acceleration average value and its corresponding frequency
Point.
6. measuring method according to claim 1, it is characterised in that also include：
The resonant frequency of the linear motor is stored.
A kind of 7. intelligent handheld device, it is characterised in that including：
Linear motor, driving chip, acceleration sensor chip and controller, wherein, the controller is used to control the drive
Dynamic chip is using first frequency as initial frequency, and second frequency is terminates frequency, with predeterminated frequency interval, successively to the linear horse
Up to the drive signal of each Frequency point of offer, and obtain under each Frequency point, the measurement data of the acceleration sensor chip；
Based under each Frequency point, the measurement data of the acceleration sensor chip, obtain in the measurement data most
Frequency point corresponding to big measured value and the greatest measurement；
Frequency point corresponding to the greatest measurement is defined as to the resonant frequency of the linear motor；
Wherein, the resonant frequency of the linear motor is located in the range of the first frequency to the second frequency.
8. intelligent handheld device according to claim 7, it is characterised in that the controller is additionally operable to according to described linear
The specifications that dispatch from the factory of motor, the numerical value of the first frequency and the second frequency is set；And/or
According to the measurement range of the acceleration sensor chip, the amplitude of the drive signal is set；And/or
According to the first frequency and second frequency, the output frequency of the measurement data of the acceleration sensor chip is set.
9. intelligent handheld device according to claim 7, it is characterised in that the controller is based on each frequency in execution
Under rate point, the measurement data of the acceleration sensor chip, the greatest measurement in the measurement data and the institute are obtained
It is specifically used for when stating Frequency point corresponding to greatest measurement：
Based under each Frequency point, the measurement data of the acceleration sensor chip, obtain corresponding to each Frequency point
Acceleration peak value；
According to acceleration peak value corresponding to each Frequency point, it is determined that maximum acceleration peak value and its corresponding Frequency point.
10. intelligent handheld device according to claim 7, it is characterised in that the controller is being performed based on each described
Under Frequency point, the measurement data of the acceleration sensor chip, obtain the greatest measurement in the measurement data and be somebody's turn to do
Frequency point corresponding to the greatest measurement is specifically used for：
Based under each Frequency point, the measurement data of the acceleration sensor chip, obtain corresponding to each Frequency point
Acceleration average value；
According to acceleration average value corresponding to each Frequency point, it is determined that maximum acceleration average value and its corresponding frequency
Point.
11. intelligent handheld device according to claim 7, it is characterised in that also including storage device, the controller is also
For the resonant frequency of the linear motor to be stored to the storage device.
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