WO2020034690A1 - 线性马达带宽测量方法 - Google Patents

线性马达带宽测量方法 Download PDF

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WO2020034690A1
WO2020034690A1 PCT/CN2019/087708 CN2019087708W WO2020034690A1 WO 2020034690 A1 WO2020034690 A1 WO 2020034690A1 CN 2019087708 W CN2019087708 W CN 2019087708W WO 2020034690 A1 WO2020034690 A1 WO 2020034690A1
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frequency
linear motor
excitation signal
steady
motor
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邓瀚林
向征
路翔
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AAC Technologies Holdings Shenzhen Co Ltd
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AAC Acoustic Technologies Shenzhen Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation
    • 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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  • the invention relates to the field of micro-electromechanics, and in particular to a method for measuring a linear motor bandwidth.
  • the touch feedback function brings users a multi-level, multi-dimensional touch interactive experience.
  • Typical examples include vibrating experience related to short message and incoming call notification; time reminder vibrating experience brought by alarm clock and calendar; low battery reminder vibrating experience; vibrating experience related to movie and game plot.
  • the linear motor is the core device that provides the touch feedback function.
  • the requirements for tactile effect design continue to increase, it is necessary to have a deeper and accurate understanding of the performance of the linear motor itself.
  • the richness and fidelity of the tactile experience are mainly determined by the vibration intensity and vibration frequency. Therefore, in the selection and comparison process of multiple linear motors, the wide frequency signal response capabilities of linear motors should be carried out. Focus on examination.
  • linear motor bandwidths faces several difficulties.
  • the linear motor will generate heat under long-term signal excitation, which causes the change of the linear motor parameters to leave the linear working area, so that the frequency response model of the linear motor is no longer a linear system.
  • the vibrator is packaged in the housing of a linear motor, and the dynamic displacement of the vibrator cannot be directly measured.
  • the large-scale non-resonant frequency signal excites the linear motor, and the peak value of the displacement at the initial stage is likely to exceed the allowable limit of the oscillator's displacement, resulting in the inability to measure the steady-state displacement peak of the corresponding frequency in the steady state.
  • the invention provides a linear motor bandwidth measurement method to solve the difficulties commonly existing in actual measurement operations, which can simplify steps, facilitate measurement, and ensure measurement accuracy.
  • the present invention provides a linear motor bandwidth measurement method, including the following steps:
  • Step S1 Set the frequency distribution of the excitation signal
  • Step S2 measuring the steady-state displacement peak value of the motor oscillator at each frequency point of the excitation signal with reference to the target displacement level to obtain a frequency response curve of the reference target displacement level;
  • Step S3 According to the frequency response curve obtained in step S2, referring to the target displacement level, determine the upper frequency limit and lower frequency limit, and obtain the linear motor bandwidth by calculating the difference between the upper frequency limit and the lower frequency limit.
  • step S1 is specifically dividing the preset frequency band to be measured into N segments, where N is an integer greater than 1, and within each frequency band to be measured, setting a frequency start point, an end point and an adjacent frequency point of the excitation signal Interval.
  • the method for measuring the steady-state displacement peak value of the motor oscillator at each frequency point with reference to the target displacement level includes the following steps:
  • Step S21 selecting an excitation signal capable of eliminating the overshoot of the linear motor
  • Step S22 Set the duration of the excitation signal so that the vibration of the linear motor enters a steady state
  • Step S23 Set the initial value of the envelope amplitude of the excitation signal
  • Step S24 Connect the load to the linear motor, input the excitation signal to the linear motor, and measure the steady-state acceleration peak of the load through the accelerometer;
  • Step S25 Estimate the steady-state displacement peak value of the motor oscillator based on the steady-state acceleration peak value of the load measured in step S24.
  • Step S26 determine whether the measurement end condition is reached, and if the measurement end condition is reached, the measurement is ended, otherwise step S24 and step S25 are repeated,
  • the excitation signal in step S21 is composed of a primer signal and a constant envelope sinusoidal signal.
  • the method for calculating the steady-state displacement peak value of the motor oscillator in step S25 is:
  • m1 is the mass of the motor vibrator of the linear motor
  • m2 is the mass of the load
  • A1 is the acceleration of the motor vibrator
  • A2 is the acceleration of the load
  • D1 is the steady state displacement peak of the motor vibrator.
  • the duration of the excitation signal in step S22 is an integer multiple of the period of the excitation signal.
  • the duration of the excitation signal in step S22 is greater than or equal to 30 periods of the excitation signal, and is less than 1 s.
  • the step S26 includes the following steps:
  • Step S261 set the target displacement level
  • Step S262 Determine whether the steady-state displacement peak value of the motor oscillator reaches the target displacement level, and if the target displacement level is reached, the measurement ends; otherwise, proceed to step S263;
  • Step S263 determine whether the envelope amplitude of the excitation signal exceeds the upper limit, and if the envelope amplitude of the excitation signal exceeds the upper limit, the measurement is terminated; otherwise, proceed to step 264;
  • Step S264 Increase the envelope amplitude of the excitation signal by a predetermined step size and repeat steps S24 and S25.
  • the target displacement level is set to 10% -80% of the limit displacement level of the motor oscillator.
  • step S3 referring to the target displacement level, the method for determining the upper frequency limit and the lower frequency limit is:
  • the peak value of the steady-state displacement of the motor oscillator satisfies the conditional expression abs (D1-D0) / D0 ⁇ 5%, then the maximum frequency of this frequency band is the upper frequency limit and the minimum frequency is the lower frequency limit.
  • D1 is the steady-state displacement peak value of the motor oscillator
  • D0 is the target displacement level.
  • the present invention provides a linear motor bandwidth measurement method, including the following steps: Step S1: Set the frequency distribution of the excitation signal; Step S2: Measure the steady state of the motor oscillator at each frequency point of the excitation signal Displace the peak value to obtain the frequency response curve of the reference target displacement level. Step S3: According to the frequency response curve reached in step S2, find the reference target displacement level, determine the upper frequency limit and lower frequency limit, and obtain the motor by calculating the difference between the upper frequency limit and the lower frequency limit. bandwidth.
  • the linear motor bandwidth measurement method provided by the present invention can solve the difficulties commonly existing in actual measurement operations, can simplify steps, facilitate measurement, and ensure measurement accuracy.
  • FIG. 2 is a flowchart of a method for measuring a steady-state displacement peak value of a motor oscillator at each frequency point with reference to a target displacement level
  • FIG. 3 is a frequency response curve diagram of a steady-state displacement peak value of a motor oscillator measured with reference to a target displacement level according to the present invention.
  • the linear motor bandwidth measurement method of this embodiment is applied to a linear motor in a smart phone or a tablet. Based on the calculation relationship between displacement and acceleration in steady state vibration, the dynamic displacement measurement is indirectly realized; by eliminating overshoot, a large non-linearity is achieved. Dynamic displacement measurement corresponding to the input signal at the resonance frequency.
  • the linear motor bandwidth measurement method of the present invention includes the following steps:
  • Step S1 Set the frequency distribution of the excitation signal, determine the frequency start point, the frequency end point, and the interval between adjacent frequency points, and give a detailed list of measured frequencies;
  • Step S2 According to the measurement frequency list prepared in step S1 and referring to the target displacement level, measure the steady-state displacement peak value of the motor oscillator for each frequency point in the measurement frequency list corresponding to the excitation signal to obtain the frequency response curve of the reference target displacement level. ;
  • Step S3 Determine the upper frequency limit and lower frequency limit of the reference target displacement level according to the frequency response curve obtained in step S2, and obtain the motor bandwidth by calculating the difference between the upper frequency limit and the lower frequency limit.
  • step S1 is specifically dividing the preset frequency band to be measured into N segments, where N is an integer greater than 1, and within each frequency band to be tested, setting the frequency start point, frequency end point, and adjacent frequency points of the excitation signal. Interval. Specifically, for example, the frequency range of the frequency to be measured is 100 Hz to 300 Hz.
  • the frequency band to be measured is first divided into 201 segments, each segment is 1 Hz, and then measured in each 1 Hz frequency band.
  • the invention adopts the method of segmented measurement, which can avoid the linear motor from heating under long-term vibration, which causes the change of the linear motor parameters to leave the linear working area, so that the frequency response model of the linear motor is no longer a linear system, thereby affecting the test of the bandwidth.
  • the steady-state displacement peak value includes the following steps:
  • Step S21 Select an excitation signal capable of eliminating the overshoot of the linear motor.
  • the excitation signal is composed of a primer signal and a constant envelope sine signal.
  • the function of the primer signal is to smoothly increase the amplitude of the signal from zero to the level of the constant envelope state. This makes the excitation signal effectively eliminate the overshoot caused by the non-resonant frequency signal to excite the motor.
  • Step S22 Set the duration of the excitation signal so that the vibration of the linear motor enters a steady state. Because the linear motor requires a certain amount of time from the start to the steady state, the duration of the excitation signal needs to be an integral multiple of the signal period. The duration of the excitation signal is greater than or equal to 30 periods of the excitation signal, that is, the excitation signal must last 30 periods or more. At the same time, in order to avoid heat generation, the duration of the excitation signal must not be too long, otherwise it will cause the motor to heat up, leave the linear working area, and affect the bandwidth test. Preferably, the duration of the excitation signal cannot exceed 1 s.
  • Step S23 Set the envelope amplitude value of the excitation signal to an initial value as a basis for later adjustment
  • Step S24 The load is connected to the linear motor.
  • the load may be a mobile phone or a tool, so that the load is driven by the linear motor.
  • the aforementioned excitation signal is input to the linear motor, and the steady-state acceleration peak of the load is measured by an accelerometer.
  • the acceleration value curve is in a steady state.
  • Step S25 Estimate the steady-state displacement peak of the motor oscillator based on the steady-state acceleration peak measured in step S24.
  • the specific calculation method is:
  • the mass of the motor oscillator of the resonant motor is m1
  • the mass of the load is m2
  • the acceleration of the motor oscillator is A1
  • the acceleration of the load is A2
  • the relationship between the motor oscillator and the load is:
  • a 1 / A 2 m 2 / m 1
  • the steady-state displacement peak value D1 of the motor oscillator can be obtained.
  • Step S26 It is determined whether or not the condition for the end of the measurement is reached.
  • step S26 includes the following steps:
  • Step S261 set the target displacement level
  • Step S262 Determine whether the steady-state displacement value reaches the reference target displacement level, and if the reference target displacement level is reached, the measurement is ended; otherwise, proceed to step S263;
  • Step S263 determine whether the envelope amplitude of the excitation signal exceeds the upper frequency limit, and if the envelope amplitude of the excitation signal exceeds the upper frequency limit, the measurement is terminated; otherwise, proceed to step 264;
  • Step S264 Increase the signal amplitude by a predetermined step and repeat steps S24 and S25.
  • the frequency response curve of the steady-state displacement peak of the motor oscillator with the reference target displacement level as shown in FIG. 3 can be obtained. From Fig. 3, the motor bandwidth for the reference target displacement level can be calculated.
  • the target displacement level is set to 10% -80% of the limit displacement level of the motor oscillator.
  • the method for determining the upper frequency limit and lower frequency limit is:
  • the peak value of the steady-state displacement of the motor oscillator satisfies the conditional expression abs (D1-D0) / D0 ⁇ 5%, then the maximum frequency of this frequency band is the upper frequency limit, and the minimum frequency is the lower frequency limit.
  • the steady state displacement peak of the motor oscillator, D0 is the target displacement level.
  • point A is the lower frequency limit and point B is the upper frequency limit.
  • the bandwidth between frequency A and frequency B is the bandwidth of the linear motor.
  • the present invention provides a linear motor bandwidth measurement method, which includes the following steps: Step S1: Set the frequency distribution of the excitation signal; Step S2: Measure the reference target displacement level of each frequency point of the excitation signal Steady-state displacement peak to obtain the frequency response curve of the reference target displacement level; Step S3: According to the frequency response curve obtained in step S2, find the upper frequency limit and lower frequency limit of the frequency of the reference target displacement level, and calculate the difference between the upper frequency limit and the lower frequency limit Get the motor bandwidth.
  • the linear motor bandwidth measurement method provided by the present invention can solve the difficulties commonly existing in actual measurement operations, can simplify steps, facilitate measurement, and ensure measurement accuracy.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Linear Motors (AREA)
  • Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)

Abstract

本发明提供了一种线性马达带宽测量方法，包括如下步骤：步骤S1：设置激励信号的频率分布；步骤S2：参考目标位移水平，对激励信号的每个频点测量马达振子的稳态位移峰值，得到参考目标位移水平的频率响应曲线；步骤S3：根据步骤S2得到的频率响应曲线，参考目标位移水平，确定频率上限和频率下限，通过计算频率上限和频率下限之差得到线性马达带宽。本发明提供的线性马达带宽测量方法可以解决实际测量操作中普遍存在的困难，可以简化步骤、方便测量且有保障测量的准确性。

Description

线性马达带宽测量方法 技术领域
本发明涉及微机电领域，尤其涉及一种线性马达带宽测量方法。
背景技术
以智能手机、平板电脑等电子设备为载体，触控反馈功能给用户带来了多层次，多维度的触控交互体验。典型的包括：短消息、来电通知相关的振感体验；闹钟，日历带来的时间提醒振感体验；低电量的提醒振感体验；与电影和游戏情节相关的振感体验。
线性马达是提供触控反馈功能的核心器件，随着触感效果设计的要求不断提高，需要对线性马达本身的性能有更深入和准确的认识。在许多电影和游戏中，根据具体情节的需要，触感体验的丰富和逼真程度主要由振动强度和振动频率决定，因此在多种线性马达的选择比较过程中应该对线性马达的宽频信号响应能力进行重点考查。
在实际操作中，测量线性马达带宽主要面临几个困难。第一，线性马达在长时间信号激励下会发热，导致线性马达参数变化脱离线性工作区，使得线性马达的频率响应模型不再是线性系统。第二，振子封装于线性马达的外壳之中，无法直接测量振子的动态位移。第三，大幅度非谐振频率信号激励线性马达，在初始阶段的位移峰值很可能超过允许的振子极限位移，导致无法测量对应频率在稳态阶段的稳态位移峰值。
因此，实有必要提供一种新的线性马达带宽测量方法以解决上述问题。
发明内容
本发明提供一种线性马达带宽测量方法，以解决实际测量操作中普遍存在的困难，可以简化步骤、方便测量且有保障测量的准确性。
为解决上述技术问题，本发明提供了一种线性马达带宽测量方法，包括如下步骤：
步骤S1：设置激励信号的频率分布；
步骤S2：参考目标位移水平，对激励信号的每个频点测量马达振子的稳态位移峰值，得到参考目标位移水平的频率响应曲线；
步骤S3：根据步骤S2得到的频率响应曲线，参考目标位移水平，确定频率上限和频率下限，通过计算频率上限和频率下限之差得到线性马达带宽。
优选的，步骤S1具体为，将预设的待测频段分为N段，N为大于1的整数，在每一段待测频段内，设置激励信号的频率起点、频率终点以及相邻频率点之间的间隔。
优选的，步骤S2中，关于参考目标位移水平测量每个频点的马达振子的稳态位移峰值的方法包括如下步骤：
步骤S21：选择能够消除线性马达过冲现象的激励信号；
步骤S22：设置激励信号的持续时长，使线性马达的振动进入稳态；
步骤S23：设置激励信号的包络幅度的初始值；
步骤S24：在线性马达上接入负载，并将激励信号输入线性马达，通过加速度计测量负载的稳态加速度峰值；
步骤S25：根据步骤S24测得的负载的稳态加速度峰值推算马达振子的稳态位移峰值。
步骤S26：判断是否达到测量结束的条件，若达到测量测结束条件则结束测量，否则重复步骤S24和步骤S25，
所述步骤S21中的激励信号为引子信号和恒包络正弦信号组成。
优选的，所述步骤S25中关于马达振子的稳态位移峰值计算方法为：
根据关系式和，求解得到马达振子的稳态位移峰值，
其中，m1为线性马达的马达振子的质量,m2为负载的质量，A1为马达振子的加速度，A2为负载的加速度，D1为马达振子的稳态位 移峰值。
优选的，所述步骤S22中激励信号的持续时长为激励信号周期的整数倍。
优选的，所述步骤S22中激励信号的持续时长大于等于30个激励信号周期，并小于1s。
优选的，所述步骤S26具体包括如下步骤：
步骤S261：设定目标位移水平；
步骤S262：判断马达振子的稳态位移峰值是否达到目标位移水平，若达到目标位移水平则结束测量；否则，进行步骤S263；
步骤S263：判断激励信号的包络幅度是否超过上限，若激励信号的包络幅度超过上限，则结束测量；否则，进行步骤264；
步骤S264：按预定步长增加激励信号的包络幅度并重复步骤S24和步骤S25。
优选的，步骤S261中，目标位移水平设定为马达振子的极限位移水平的10％-80％。
优选的，步骤S3中，参考目标位移水平，确定频率上限和频率下限的方法为：
若在某一频段内，马达振子的稳态位移峰值满足条件式abs(D1-D0)/D0≤5％，则这一频段的最大频率为频率上限，最小频率为频率下限，
其中，D1为马达振子的稳态位移峰值，D0为目标位移水平。。
相较于现有技术，本发明提供了一种线性马达带宽测量方法，包括如下步骤：步骤S1：设置激励信号的频率分布；步骤S2：对激励信号的每个频点测量马达振子的稳态位移峰值，得到参考目标位移水平的频率响应曲线；步骤S3：根据步骤S2达到的频率响应曲线，找到参考目标位移水平，确定频率的上限和频率下限，通过计算频率上限和频率下限之差得到马达带宽。本发明提供的线性马达带宽测量方法可以解决实际测量操作中普遍存在的困难，可以简化步骤、方便测量且有保障测量的准确性。
附图说明
图1为本发明线性马达带宽测量方法的流程图；
图2为在每个频点，参考目标位移水平测量马达振子的的稳态位移峰值的方法的流程图；
图3为本发明参考目标位移水平测得的马达振子的稳态位移峰值的频率响应曲线图。
具体实施方式
下面将结合附图和实施方式对本发明作进一步说明。
本实施方式的线性马达带宽测量方法应用于在智能手机、平板电脑中的线性马达，基于稳态振动中位移与加速度的计算关系，间接实现动态位移的测量；通过消除过冲，实现大幅度非谐振频率输入信号对应的动态位移测量。
如图1所示，本发明的线性马达带宽测量方法包括如下步骤：
步骤S1：设置激励信号的频率分布，确定频率起点、频率终点以及相邻频率点之间的间隔，并给出详细的测量频率列表；
步骤S2：根据步骤S1中制成的测量频率列表，参考目标位移水平，对激励信号对应测量频率列表中的每个频点测量马达振子的稳态位移峰值，得到参考目标位移水平的频率响应曲线；
步骤S3：根据步骤S2得到的频率响应曲线，确定参考目标位移水平的频率上限和频率下限，通过计算频率上限和频率下限之差得到马达带宽。
具体的，步骤S1具体为，将预设的待测频段分为N段，N为大于1的整数，在每一段待测频段内，设置激励信号的频率起点、频率终点以及相邻频率点之间的间隔。具体的，例如待测频率的频率范围为100Hz至300Hz，先将待测频段分割成201段，每段为1Hz，然后再在每个1Hz频段内测量。本发明采用分段测量的方式，可以避免线性马达在长时间振动下发热，导致线性马达参数变化脱离线性工作区，使得线性马达的频率响应模型不再是线性系统，从而影响带宽的 测试。
如图2所述，为步骤S2中参考目标位移水平，测量每个频点的马达振子的稳态位移峰值的方法的流程图，具体的，稳态位移峰值包括如下步骤：
步骤S21：选择能够消除线性马达过冲现象的激励信号。
在本实施方式中，激励信号为引子信号和恒包络正弦信号组成。引子信号的作用就是将信号的幅度平滑地从零值提升至恒包络状态的水平。使得这种激励信号可以有效地消除非谐振频率信号激励马达导致的过冲现象。
步骤S22：设置激励信号的持续时长，使线性马达的振动进入稳态；由于，线性马达从起振到进入稳态需要一定的时间，因此需要激励信号的时长持续信号周期的整数倍，优选的，激励信号的持续时长大于等于30个激励信号周期，即激励信号得持续30个周期或者更多。同时，为了避免发热，激励信号的持续时长不能过长，否则引起马达发热，脱离线性工作区，影响带宽的测试。优选的，激励信号的持续时长不能超过1s。
步骤S23：设置激励信号的包络幅度的值为初始值，作为后期调整的基础；
步骤S24：在线性马达上接入负载，该负载可以为手机或者工装，使得负载在线性马达的带动下运动，将前述的激励信号输入线性马达，并通过加速度计测量负载的稳态加速度峰值。优选的，在测量过程中需要通过数据分析手段判断加速度数值曲线处于稳态。
步骤S25：根据步骤S24测得的稳态加速度峰值推算马达振子的稳态位移峰值。具体的计算方法为：
谐振马达的马达振子的质量为m1,负载的质量为m2，马达振子的加速度为A1，负载的加速度为A2，马达振子与负载具有的关系为：A 1/A 2=m 2/m 1，根据关系式A 1＝ω 2D 1，可以求解得到马达振子的稳态位移峰值D1。
步骤S26：判断是否达到测量结束的条件。
具体的，步骤S26包括如下步骤：
步骤S261：设定目标位移水平；
步骤S262：判断稳态位移值是否达到参考目标位移水平，若达到参考目标位移水平则结束测量；否则，进行步骤S263；
步骤S263：判断激励信号的包络幅度是否超过频率上限，若激励信号的包络幅度超过频率上限，则结束测量；否则，进行步骤264；
步骤S264：按预定步长增加信号幅度并重复步骤S24和步骤S25。
完成各频率参考目标位移水平的稳态位移峰值测量之后，可以得到如图3所示的参考目标位移水平的马达振子的稳态位移峰值的频率响应曲线。从图3可以计算出参考目标位移水平的马达带宽。
参照图3所示，S261中，目标位移水平设定为马达振子的极限位移水平的10％-80％。
根据图3所示的马达振子的稳态位移峰值的频率响应曲线，参考目标位移水平，确定频率上限和频率下限的方法为：
若在某一频段内，马达振子的稳态位移峰值满足条件式abs(D1-D0)/D0≤5％，则这一频段的最大频率为频率上限，最小频率为频率下限，其中，D1为马达振子的稳态位移峰值，D0为目标位移水平。例如，图3中，A点为频率下限，B点为频率上限。而频点A至频点B之间的带宽即为线性马达的带宽。
相较于现有技术，本发明提供了一种线性马达带宽测量方法，包括如下步骤：步骤S1：设置激励信号的频率分布；步骤S2：对激励信号的每个频点测量参考目标位移水平的稳态位移峰值，得到参考目标位移水平的频率响应曲线；步骤S3：根据步骤S2得到的频率响应曲线，找到参考目标位移水平的频率的频率上限和频率下限，通过计算频率上限和频率下限之差得到马达带宽。本发明提供的线性马达带宽测量方法可以解决实际测量操作中普遍存在的困难，可以简化步骤、方便测量且有保障测量的准确性。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范 围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其它相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (10)

  1. 一种线性马达带宽测量方法，其特征在于，包括如下步骤：
    步骤S1：设置激励信号的频率分布；
    步骤S2：参考目标位移水平，对激励信号的每个频点测量马达振子的稳态位移峰值，得到参考目标位移水平的频率响应曲线；
    步骤S3：根据步骤S2得到的频率响应曲线，参考目标位移水平，确定频率上限和频率下限，通过计算频率上限和频率下限之差得到线性马达带宽。
  2. 根据权利要求1所述的线性马达带宽测量方法，其特征在于，步骤S1具体为，将预设的待测频段分为N段，N为大于1的整数，在每一段待测频段内，设置激励信号的频率起点、频率终点以及相邻频率点之间的间隔。
  3. 根据权利要求1所述的线性马达带宽测量方法，其特征在于，步骤S2中，关于参考目标位移水平测量每个频点的马达振子的稳态位移峰值的方法包括如下步骤：
    步骤S21：选择能够消除线性马达过冲现象的激励信号；
    步骤S22：设置激励信号的持续时长，使线性马达的振动进入稳态；
    步骤S23：设置激励信号的包络幅度的初始值；
    步骤S24：在线性马达上接入负载，并将激励信号输入线性马达，通过加速度计测量负载的稳态加速度峰值；
    步骤S25：根据步骤S24测得的负载的稳态加速度峰值推算马达振子的稳态位移峰值。
    步骤S26：判断是否达到测量结束的条件，若达到测量测结束条件则结束测量，否则重复步骤S24和步骤S25，
  4. 根据权利要求3所述的线性马达带宽测量方法，其特征在于，所述步骤S21中的激励信号为引子信号和恒包络正弦信号组成。
  5. 根据权利要求3所述的线性马达带宽测量方法，其特征在于，所述步骤S25中关于马达振子的稳态位移峰值计算方法为：
    根据关系式A 1/A 2＝m 2/m 1和A 1＝ω 2D 1，求解得到马达振子的稳态位移峰值，
    其中，m1为线性马达的马达振子的质量,m2为负载的质量，A1为马达振子的加速度，A2为负载的加速度，D1为马达振子的稳态位移峰值。
  6. 根据权利要求3所述的线性马达带宽测量方法，其特征在于，所述步骤S22中激励信号的持续时长为激励信号周期的整数倍。
  7. 根据权利要求6所述的线性马达带宽测量方法，其特征在于，所述步骤S22中激励信号的持续时长大于等于30个激励信号周期，并小于1s。
  8. 根据权利要求3所述的线性马达带宽测量方法，其特征在于，所述步骤S26具体包括如下步骤：
    步骤S261：设定目标位移水平；
    步骤S262：判断马达振子的稳态位移峰值是否达到目标位移水平，若达到目标位移水平则结束测量；否则，进行步骤S263；
    步骤S263：判断激励信号的包络幅度是否超过上限，若激励信号的包络幅度超过上限，则结束测量；否则，进行步骤264；
    步骤S264：按预定步长增加激励信号的包络幅度并重复步骤S24和步骤S25。
  9. 根据权利要求8所述的线性马达带宽测量方法，其特征在于，步骤S261中，目标位移水平设定为马达振子的极限位移水平的10％-80％。
  10. 根据权利要求1所述的线性马达带宽测量方法，其特征在于，步骤S3中，参考目标位移水平，确定频率上限和频率下限的方法为：
    若在某一频段内，马达振子的稳态位移峰值满足条件式abs(D1-D0)/D0≤5％，则这一频段的最大频率为频率上限，最小频率为频率下限，
    其中，D1为马达振子的稳态位移峰值，D0为目标位移水平。
PCT/CN2019/087708 2018-08-14 2019-05-21 线性马达带宽测量方法 Ceased WO2020034690A1 (zh)

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