CN110907827A - Motor transient distortion measuring method and system - Google Patents
Motor transient distortion measuring method and system Download PDFInfo
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- CN110907827A CN110907827A CN201911153699.4A CN201911153699A CN110907827A CN 110907827 A CN110907827 A CN 110907827A CN 201911153699 A CN201911153699 A CN 201911153699A CN 110907827 A CN110907827 A CN 110907827A
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- 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
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
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- G01R23/20—Measurement of non-linear distortion
Abstract
The invention provides a method and a system for measuring transient distortion of a motor, comprising the following steps: setting an input voltage of a motor, and generating a synchronous frequency sweeping signal by using the input voltage; exciting a motor by using the synchronous frequency sweeping signal, and acquiring the synchronous frequency sweeping signal and an acceleration parameter of the motor in a vibration direction; determining order impulse response of a system by using the synchronous frequency sweeping signal and the acceleration parameter, and obtaining an output signal of the system by using the order impulse response and the synchronous frequency sweeping signal; and determining a distortion signal according to the output signal and the measurement signal, and obtaining an average transient distortion signal by using the distortion signal. According to the invention, the distortion signals corresponding to the input voltage signals are obtained under the condition of different input voltage signals, and the linear and nonlinear distortion signals are eliminated in a modeling mode to calculate the average transient distortion signal, so that the accuracy of evaluating the motor performance can be improved.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to transient distortion measurement, and particularly to a method and a system for measuring transient distortion of a motor.
[ background of the invention ]
With the increasing popularity of portable devices such as smart phones and tablet computers, it becomes more and more important to provide tactile feedback for these portable devices, which becomes an effective way to enhance user experience. An exciter (motor for short) is usually placed in these portable devices to implement a vibration function to alert the user or effect feedback.
The method is easy to control a pure linear system, and can be carried out in a form similar to a transfer function; however, due to the influence of magnetic circuits, structures, processes and the like, the exciter presents certain nonlinearity, so that the output generates additional frequency components compared with the input; meanwhile, due to the influence of voice coil technology, mass travel and the like, the exciter may also probabilistically generate some output noise. All these undesired output components can be collectively referred to as distortion, and it is necessary to study the distortion of the different actuators in order to evaluate their performance.
In the prior art, a commonly used method is to measure the total steady state harmonic Distortion of the exciter, i.e. the THD (total harmonic Distortion) measurement. The method can only measure the nonlinear distortion of the exciter in a steady state, and has certain limitation on the evaluation of the nonlinear distortion.
Therefore, there is a need for a new method and system for measuring transient distortion of a motor.
[ summary of the invention ]
The invention aims to provide a method and a system for measuring transient distortion of a motor, which aim to solve the technical problem that only nonlinear distortion signals under a steady state can be measured and other distortion signals cannot be measured in the prior art.
The technical scheme of the invention is as follows:
the first aspect of the present invention provides a method for measuring transient distortion of a motor, comprising the steps of:
setting an input voltage of a motor, and generating a synchronous frequency sweeping signal by using the input voltage;
exciting a motor by using the synchronous frequency sweeping signal, and acquiring the synchronous frequency sweeping signal and an acceleration parameter of the motor in a vibration direction;
determining order impulse response of a system by using the synchronous frequency sweeping signal and the acceleration parameter, and obtaining an output signal of the system by using the order impulse response and the synchronous frequency sweeping signal;
and determining a distortion signal according to the output signal and the measurement signal, and obtaining an average transient distortion signal by using the distortion signal.
Optionally, the synchronous frequency sweep signal is represented as:
wherein x (t) represents a function of the synchronous swept frequency signal, f1Indicating the starting frequency, L the rate of change of frequency, and t the time.
Optionally, the step of determining the order impulse response of the system by using the synchronous frequency sweep signal and the acceleration parameter includes:
and performing inverse filtering Fourier transform by using the synchronous frequency sweep signal, wherein the formula of the inverse filtering Fourier transform is as follows:
wherein the content of the first and second substances,
an inverse filtered Fourier transform, f, representing the synchronous swept frequency signal1Represents a starting frequency, L represents a frequency change rate, t represents time, and f represents a frequency corresponding to time;
determining an order impulse response of a system by using the inverse filtered Fourier transform and the acceleration parameter, wherein the order impulse response is as follows:
wherein h (t) represents the order impulse response, a (t) represents the acceleration parameter,
an inverse filtered fourier transform representing the synchronous swept frequency signal.
Optionally, the step of obtaining the output signal of the system by using the order impulse response and the synchronous frequency sweep signal includes:
determining a group delay parameter using the impulse response function, the group delay parameter having a formula as follows:
Δt＝L·ln(n)
wherein Δ t represents the group delay parameter, L represents the frequency change rate, and n represents different order times;
determining the order times contained in the impulse response function according to the group delay function;
determining an output signal of the system according to the synchronous frequency sweep signal, the impulse response function and the order number, wherein the formula of the output signal is as follows:
wherein y (t) represents the output signal, n represents different order numbers, xn(t) represents the synchronous sweep frequency signal corresponding to different orders, hnAnd (t) represents the order impulse response corresponding to different order numbers, represents the convolution operation, and represents the nonlinear highest order number.
Optionally, the determining a distortion signal according to the output signal and the measurement signal, and the obtaining an average transient distortion signal using the distortion signal includes:
generating a modeling signal according to the output signal and the order number;
determining a time domain distortion signal by using the modeling signal and the measurement signal, wherein the time domain distortion signal has the following formula:
e(t)＝yFIT(t)-yMES(t)
wherein e (t) represents the time-domain distortion signal, yFIT(t) represents the modeling signal, yMES(t) represents the measurement signal, t represents time;
determining a frequency domain distortion signal by using the time domain distortion signal, and determining a transient distortion signal of the input voltage according to the frequency domain distortion signal and a preset effective signal, wherein the transient distortion signal is as follows:
wherein d isIHD(f) Representing the transient distortion signal, e (f) representing the frequency domain distortion signal, yRMSRepresents a valid signal;
carrying out local average processing by using the transient distortion signal to obtain an average transient distortion signal, wherein the formula of the average transient distortion signal is as follows:
wherein d isMHD(f) Representing said average transient distortion signal, eRMSRepresenting the frequency domain distortion effective signal, yRMSRepresenting a valid signal.
Optionally, the step of determining a frequency domain distortion signal by using the time domain distortion signal includes:
determining the frequency domain distortion signal according to a preset time-frequency mapping relation by using the time domain distortion signal, wherein the formula of the time-frequency mapping relation is as follows:
wherein t represents time, L represents frequency change rate, f1Denotes the starting frequency, f (t) denotes the frequency corresponding to time t;
the relationship between the time-domain distortion signal and the frequency-domain distortion signal is represented as follows:
wherein e (t) represents the time domain distortion signal, e (f) represents the frequency domain distortion signal.
Optionally, the step of generating a modeling signal according to the output signal and the order number includes:
and determining the value of the order times, and generating a modeling signal corresponding to the value of the order times by using the output signal.
A second aspect of the invention provides a motor transient distortion measurement system, the system comprising:
the input adjusting module is used for setting the input voltage of the motor and generating a synchronous frequency sweeping signal by using the input voltage;
the signal acquisition module is used for exciting the motor by utilizing the synchronous frequency sweeping signal and acquiring the synchronous frequency sweeping signal and an acceleration parameter of the motor in the vibration direction;
the output calculation module is used for determining the order impulse response of the system by using the synchronous frequency sweep signal and the acceleration parameter and obtaining the output signal of the system by using the order impulse response and the synchronous frequency sweep signal;
and the distortion calculation module is used for determining a distortion signal according to the output signal and the measurement signal and obtaining an average transient distortion signal by using the distortion signal.
The invention has the beneficial effects that: the invention provides a method and a system for measuring transient distortion of a motor, comprising the following steps: setting an input voltage of a motor, and generating a synchronous frequency sweeping signal by using the input voltage; exciting a motor by using the synchronous frequency sweeping signal, and acquiring the synchronous frequency sweeping signal and an acceleration parameter of the motor in a vibration direction; determining order impulse response of a system by using the synchronous frequency sweeping signal and the acceleration parameter, and obtaining an output signal of the system by using the order impulse response and the synchronous frequency sweeping signal; and determining a distortion signal according to the output signal and the measurement signal, and obtaining an average transient distortion signal by using the distortion signal. According to the invention, the distortion signals corresponding to the input voltage signals are obtained under the condition of different input voltage signals, and the linear and nonlinear distortion signals are eliminated in a modeling mode to calculate the average transient distortion signal, so that the accuracy of evaluating the motor performance can be improved.
[ description of the drawings ]
FIG. 1 is a flowchart illustrating steps of a method for measuring transient distortion of a motor according to the present invention;
fig. 2 is a block diagram of a transient distortion measurement system of a motor according to the present invention.
[ detailed description ] embodiments
The invention is further described with reference to the following figures and embodiments.
Referring to fig. 1, fig. 1 is a flow chart illustrating steps of a method for measuring transient distortion of a motor according to a first aspect of the present invention, the method including the steps of:
s101: setting the input voltage of a motor, and generating a synchronous frequency sweeping signal by using the input voltage;
in the embodiment of the present invention, step S101 is mainly to set the input voltage of the motor, so as to generate the synchronous frequency sweep signal according to the voltage; for a nonlinear model, the magnitude of the nonlinear model has a direct relationship with the magnitude of the input signal; in this step, for the motor (actuator), the larger the input voltage is, the larger the displacement of the mass block is, and the larger the corresponding nonlinear distortion is. Generally, a method of traversing different voltages is adopted to obtain nonlinear distortion under different displacement levels, namely, the nonlinear distortion is increased to a rated voltage level by a certain step length from a small voltage; therefore, before each distortion signal is measured, the input voltage of the motor needs to be adjusted according to the preset unit voltage value, so as to obtain the distortion signal data under various input voltages.
S102: exciting the motor by using the synchronous frequency sweeping signal, and acquiring the synchronous frequency sweeping signal and an acceleration parameter of the motor in the vibration direction;
in the embodiment of the invention, step S102 is to excite the motor by mainly using the synchronous frequency sweep signal, and to acquire the synchronous frequency sweep signal and the acceleration parameter of the motor in the vibration direction by using a specific data acquisition module; in the step, a digital signal generated by a computer PC is sent to an acquisition card NI-DAQ for digital-to-analog conversion into an analog signal, the analog signal is transmitted to an amplifier AMP2 for amplification, so as to obtain a synchronous frequency sweep signal for exciting the motor, an accelerometer is mainly adopted to measure an acceleration parameter in the vibration direction of the motor after the motor is excited, the acceleration parameter is transmitted to an APM1 for data processing and feedback to the acquisition card NI-DAQ, and meanwhile, the acquisition card NI-DAQ is also used for directly acquiring the synchronous frequency sweep signal obtained after amplification of the amplifier AMP 2.
S103: determining order impulse response of the system by using the synchronous frequency sweep signal and the acceleration parameter, and obtaining an output signal of the system by using the order impulse response and the synchronous frequency sweep signal;
in the implementation of the present invention, step S103 is mainly to perform data processing on the acquired synchronous frequency sweep signal and the acceleration parameter, for example, the synchronous frequency sweep signal is used to obtain an inverse fourier transform of the signal, and the inverse fourier transform and the acceleration parameter are used to perform a related fourier transform and an inverse fourier transform to obtain each order impulse response of the system; furthermore, separation is carried out according to the group delay of different order times in the order impulse response to obtain each order number, and further obtain the output signal size of the system.
S104: and determining a distortion signal according to the output signal and the measurement signal, and obtaining an average transient distortion signal by using the distortion signal.
Step S104, calculating by using the output signal and the measurement signal to obtain a distortion signal, and further solving an average transient distortion signal; in the step, only specific linear distortion and specific nonlinear distortion can be subjected to numerical value or parameter modeling through a model, so that modeling signals corresponding to different orders can be obtained through output signals, distortion signals are determined according to the modeling signals and measurement signals, and then relevant time-frequency mapping processing and frequency domain local average processing are carried out on the distortion parameters to obtain average transient distortion signals which can be used for evaluating the performance of the motor; furthermore, the performance of the motor is evaluated by combining the average transient distortion signals obtained under various input voltages, so that the accuracy is high.
In the embodiment of the present invention, the formula of the synchronous frequency sweep signal is expressed as:
where x (t) represents a function of the synchronous swept frequency signal, f1Represents the starting frequency, L represents the rate of change of frequency, t represents time;
further, the frequency change rate L is defined as follows:
wherein, round [ 2 ]]In order to carry out the rounding operation,
for the approximate time length of the swept frequency signal, f1Denotes the starting frequency, f2To terminate the frequency (it should be noted that the termination frequency is the start frequency f1Integer multiple of) and the synchronous swept frequency signal needs to start from zero phase and end from zero phase; in this embodiment, for linear and nonlinear system identification, a synchronous frequency sweep signal with sliding logarithmic frequency is usually used as excitation, so that the system can be conveniently identified, the group delay of the synchronous frequency sweep signal for different orders of impulse response of the system is different, the impulse response of different orders can be accurately separated, and the transient time domain distortion can be mapped to transient frequency domain distortion by using the mapping relationship existing between time t and frequency f of the synchronous frequency sweep signal.
In an embodiment of the present invention, the step of determining the order impulse response of the system by using the synchronous frequency sweep signal and the acceleration parameter includes:
and performing inverse filtering Fourier transform by using the synchronous frequency sweep signal, wherein the formula of the inverse filtering Fourier transform is as follows:
wherein the content of the first and second substances,
presentation synchronizationInverse filtered Fourier transform of the swept frequency signal, f1Represents a starting frequency, L represents a frequency change rate, t represents time, and f represents a frequency corresponding to time;
determining the order impulse response of the system by utilizing inverse filter Fourier transform and acceleration parameters, wherein the formula of the order impulse response is as follows:
wherein h (t) represents an order impulse response, a (t) represents an acceleration parameter,
representing the inverse filtered fourier transform of the synchronous swept frequency signal.
In an embodiment of the present invention, the step of obtaining the output signal of the system by using the order impulse response and the synchronous frequency sweep signal includes:
determining a group delay parameter using the impulse response function, the group delay parameter having the formula:
Δt＝L·ln(n)
wherein, Δ t represents a group delay parameter, L represents a frequency change rate, and n represents different order times;
determining order times contained in the impulse response function according to the group delay function;
determining an output signal of the system according to the synchronous frequency sweep signal, the impulse response function and the order number, wherein the formula of the output signal is as follows:
where y (t) denotes the output signal, n denotes the different order numbers, xn(t) represents the synchronous sweep frequency signal corresponding to different orders, hn(t) representing order impulse responses corresponding to different order numbers, representing convolution operation, and N representing the nonlinear highest order number; in this embodiment, the distortion content of each order can be obtained through the output signal, wherein the order number n includes order numbers of 0, 1 and 2, wherein,when the order number n is 1, the corresponding specific linear distortion can be obtained; when n is more than or equal to 2, corresponding specific nonlinear distortion can be obtained; it should be noted that transient distortion cannot be obtained by numerical or parametric modeling, wherein transient distortion includes transient distortion and random distortion.
In an embodiment of the present invention, the step of determining a distortion signal according to the output signal and the measurement signal, and obtaining an average transient distortion signal using the distortion signal includes:
generating a modeling signal according to the output signal and the order number;
determining a time domain distortion signal by using the modeling signal and the measurement signal, wherein the formula of the time domain distortion signal is as follows:
e(t)＝yFIT(t)-yMES(t)
where e (t) represents the time domain distortion signal, yFIT(t) represents the modeling signal, yMES(t) represents a measurement signal, t represents time;
determining a frequency domain distortion signal by using the time domain distortion signal, and determining a transient distortion signal of the input voltage according to the frequency domain distortion signal and a preset effective signal, wherein the transient distortion signal is as follows:
wherein d isIHD(f) Representing transient distortion signals, e (f) representing frequency domain distortion signals, yRMSRepresenting a valid signal, the valid signal being defined as follows:
wherein, yRMSRepresenting a valid signal, y (t) representing an output signal, t representing time;
further, because the transient distortion IHD has a large fluctuation on the frequency spectrum, the transient distortion signal is used to perform local average processing to obtain an average transient distortion signal, and the formula of the average transient distortion signal is as follows:
wherein d isMHD(f) Representing the average transient distortion signal, eRMSRepresenting the frequency domain distortion effective signal, yRMSRepresenting an effective signal, wherein the frequency domain distortion effective signal is defined as follows:
wherein e isRMSRepresenting the frequency domain distortion valid signal, e (t) representing the time domain distortion signal, and t representing time. In this embodiment, the steps specifically include: and performing modeling, time domain distortion signal calculation, frequency domain distortion signal acquisition and average transient distortion signal calculation by using the output signal, wherein the average transient distortion signal obtained by calculation can be used for the performance of a motor in the system, and the accuracy in evaluation is improved.
In an implementation of the present invention, the step of determining a frequency domain distortion signal using the time domain distortion signal comprises:
determining a frequency domain distortion signal according to a preset time-frequency mapping relation by using the time domain distortion signal, wherein the formula of the time-frequency mapping relation is as follows:
wherein t represents time, L represents frequency change rate, f1Denotes the starting frequency, f (t) denotes the frequency corresponding to time t;
the relationship between the time-domain distortion signal and the frequency-domain distortion signal is represented as follows:
where e (t) represents a time domain distortion signal, and e (f) represents a frequency domain distortion signal. In this embodiment, the time domain distortion signal is mapped to a frequency domain distortion signal according to a time-frequency domain mapping relationship, and the frequency domain distortion signal is used for participating in the calculation of the transient distortion, so as to obtain a related transient distortion signal.
In an embodiment of the present invention, the step of generating the modeling signal according to the output signal and the order number includes:
and determining the value of the order times, and generating a modeling signal corresponding to the value of the order times by using the output signal. In the step, only specific linear distortion and specific nonlinear distortion can be subjected to numerical or parameter modeling through a model, so that modeling signals corresponding to different orders can be obtained through output signals, and distortion signals are determined according to the modeling signals and the measurement signals; specifically, when the order number is 0, all distortion signals or distortion contents are obtained through function calculation corresponding to the output signals; when the order number is 1, calculating to obtain specific linear distortion through a function corresponding to the output signal; when the order number is greater than or equal to 2, calculating to obtain specific nonlinear distortion through a function corresponding to the output signal; transient distortion (trigger distortion and random distortion) cannot be obtained by numerical value or numerical parameter modeling, and can be obtained by combining the modeling.
A second aspect of the present invention provides a system for measuring transient distortion of a motor, referring to fig. 2, fig. 2 is a block diagram of a system for measuring transient distortion of a motor according to the present invention, the system comprising:
an input adjusting module 201, configured to set an input voltage of the motor, and generate a synchronous frequency sweep signal by using the input voltage; in this embodiment, for the nonlinear model, the magnitude thereof has a direct relationship with the magnitude of the input voltage signal; for a motor (actuator), the larger the input voltage is, the larger the displacement of the mass block is caused, and the corresponding nonlinear distortion is also larger, so that the input adjusting module 201 adjusts the magnitude of the input voltage signal to obtain the nonlinear distortion at different displacement levels by a method of different voltage traversals, that is, starting from a small voltage, the nonlinear distortion is increased to a rated voltage level by a certain step size.
The signal acquisition module 202 is configured to excite the motor with the synchronous frequency sweep signal, and acquire the synchronous frequency sweep signal and an acceleration parameter of the motor in the vibration direction; in this embodiment, the digital signal generated by the computer PC is sent to the signal acquisition module 202, and the signal acquisition module 202 includes: an acquisition card NI-DAQ, an amplifier AMP2 and an APM 1; specifically, the acquisition card NI-DAQ performs digital-to-analog conversion to an analog signal, the analog signal is transmitted to the amplifier AMP2 to be amplified, so that a synchronous frequency sweep signal for exciting the motor is obtained, an accelerometer is mainly adopted to measure acceleration parameters in the vibration direction of the motor after the motor is excited, the acceleration parameters are transmitted to the APM1 to be subjected to data processing and fed back to the acquisition card NI-DAQ, and meanwhile, the acquisition card NI-DAQ is also used for directly acquiring the synchronous frequency sweep signal obtained after the amplification of the amplifier AMP 2.
The output calculation module 203 is configured to determine an order impulse response of the system by using the synchronous frequency sweep signal and the acceleration parameter, and obtain an output signal of the system by using the order impulse response and the synchronous frequency sweep signal;
and the distortion calculation module 204 is configured to determine a distortion signal according to the output signal and the measurement signal, and obtain an average transient distortion signal by using the distortion signal. In this embodiment, only specific linear distortion and specific nonlinear distortion can be modeled by a model, so that the distortion calculation module 204 can obtain modeling signals corresponding to different orders by using the output signal, determine a distortion signal according to the modeling signal and the measurement signal, and further perform related time-frequency mapping processing and frequency domain local averaging processing on the distortion parameter to obtain an average transient distortion signal, which can be used for evaluating the performance of the motor; furthermore, the performance of the motor is evaluated by combining the average transient distortion signals obtained under various input voltages, so that the accuracy is high.
In the implementation of the present invention, the system includes an input adjusting module 201, a signal collecting module 202, an output calculating module 203 and a distortion calculating module 204; different input voltages of the motor are set through the input adjusting module 201, corresponding synchronous frequency sweeping signals for exciting the motor are generated, the synchronous frequency sweeping signals are amplified or converted through the signal acquisition module 202, the synchronous frequency sweeping signals and acceleration parameters of the motor in the vibration direction are acquired, output signals of the system are acquired through the output calculation module 203, and average transient distortion signals are calculated through the distortion calculation module 204; the corresponding distortion signals are obtained under the condition of different input voltage signals, and the linear distortion signals and the nonlinear distortion signals are eliminated in a modeling mode to calculate the average transient distortion signal, so that the accuracy of evaluating the motor performance can be improved.
The invention has the beneficial effects that: the invention provides a method and a system for measuring transient distortion of a motor, comprising the following steps: setting the input voltage of a motor, and generating a synchronous frequency sweeping signal by using the input voltage; exciting the motor by using the synchronous frequency sweeping signal, and acquiring the synchronous frequency sweeping signal and an acceleration parameter of the motor in the vibration direction; determining order impulse response of the system by using the synchronous frequency sweep signal and the acceleration parameter, and obtaining an output signal of the system by using the order impulse response and the synchronous frequency sweep signal; and determining a distortion signal according to the output signal and the measurement signal, and obtaining an average transient distortion signal by using the distortion signal. According to the invention, the distortion signals corresponding to the input voltage signals are obtained under the condition of different input voltage signals, and the linear and nonlinear distortion signals are eliminated in a modeling mode to calculate the average transient distortion signal, so that the accuracy of evaluating the motor performance can be improved.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A method for measuring transient distortion of a motor is characterized by comprising the following steps:
setting an input voltage of a motor, and generating a synchronous frequency sweeping signal by using the input voltage;
exciting a motor by using the synchronous frequency sweeping signal, and acquiring the synchronous frequency sweeping signal and an acceleration parameter of the motor in a vibration direction;
determining order impulse response of a system by using the synchronous frequency sweeping signal and the acceleration parameter, and obtaining an output signal of the system by using the order impulse response and the synchronous frequency sweeping signal;
and determining a distortion signal according to the output signal and the measurement signal, and obtaining an average transient distortion signal by using the distortion signal.
2. The motor transient distortion measurement method of claim 1, wherein the synchronous swept frequency signal is represented as:
wherein x (t) represents a function of the synchronous swept frequency signal, f1Indicating the starting frequency, L the rate of change of frequency, and t the time.
3. The method of claim 1, wherein the step of determining the order impulse response of the system using the synchronized swept frequency signal and the acceleration parameters comprises:
and performing inverse filtering Fourier transform by using the synchronous frequency sweep signal, wherein the formula of the inverse filtering Fourier transform is as follows:
wherein the content of the first and second substances,
an inverse filtered Fourier transform, f, representing the synchronous swept frequency signal1Represents a starting frequency, L represents a frequency change rate, t represents time, and f represents a frequency corresponding to time;
determining an order impulse response of a system by using the inverse filtered Fourier transform and the acceleration parameter, wherein the order impulse response is as follows:
wherein h (t) represents the order impulse response, a (t) represents the acceleration parameter,
an inverse filtered fourier transform representing the synchronous swept frequency signal.
4. The method of claim 1, wherein the step of obtaining the output signal of the system using the order impulse response and the synchronous swept frequency signal comprises:
determining a group delay parameter using the impulse response function, the group delay parameter having a formula as follows:
Δt＝L·ln(n)
wherein Δ t represents the group delay parameter, L represents the frequency change rate, and n represents different order times;
determining the order times contained in the impulse response function according to the group delay function;
determining an output signal of the system according to the synchronous frequency sweep signal, the impulse response function and the order number, wherein the formula of the output signal is as follows:
wherein y (t) represents the output signal, n represents different order numbers, xn(t) represents the synchronous sweep frequency signal corresponding to different orders, hnAnd (t) represents the order impulse response corresponding to different order numbers, represents the convolution operation, and represents the nonlinear highest order number.
5. The method of claim 4, wherein the step of determining a distortion signal based on the output signal and the measurement signal, and using the distortion signal to obtain an average transient distortion signal comprises:
generating a modeling signal according to the output signal and the order number;
determining a time domain distortion signal by using the modeling signal and the measurement signal, wherein the time domain distortion signal has the following formula:
e(t)＝yFIT(t)-yMES(t)
wherein e (t) represents the time-domain distortion signal, yFIT(t) represents the modeling signal, yMES(t) represents the measurement signal, t represents time;
determining a frequency domain distortion signal by using the time domain distortion signal, and determining a transient distortion signal of the input voltage according to the frequency domain distortion signal and a preset effective signal, wherein the transient distortion signal is as follows:
wherein d isIHD(f) Representing the transient distortion signal, e (f) representing the frequency domain distortion signal, yRMSRepresents a valid signal;
carrying out local average processing by using the transient distortion signal to obtain an average transient distortion signal, wherein the formula of the average transient distortion signal is as follows:
wherein d isMHD(f) Representing said average transient distortion signal, eRMSRepresenting the frequency domain distortion effective signal, yRMSRepresenting a valid signal.
6. The motor transient distortion measurement method of claim 5, wherein the step of determining a frequency domain distortion signal using the distortion signal comprises:
determining the frequency domain distortion signal according to a preset time-frequency mapping relation by using the time domain distortion signal, wherein the formula of the time-frequency mapping relation is as follows:
wherein t represents time, L represents frequency change rate, f1Denotes the starting frequency, f (t) denotes the frequency corresponding to time t;
the relationship between the time-domain distortion signal and the frequency-domain distortion signal is represented as follows:
wherein e (t) represents the time domain distortion signal, e (f) represents the frequency domain distortion signal.
7. The method of claim 5, wherein the step of generating a modeling signal based on the output signal and the order number comprises:
and determining the value of the order times, and generating a modeling signal corresponding to the value of the order times by using the output signal.
8. A system for measuring transient distortion of a motor, the system comprising:
the input adjusting module is used for setting the input voltage of the motor and generating a synchronous frequency sweeping signal by using the input voltage;
the signal acquisition module is used for exciting the motor by utilizing the synchronous frequency sweeping signal and acquiring the synchronous frequency sweeping signal and an acceleration parameter of the motor in the vibration direction;
the output calculation module is used for determining the order impulse response of the system by using the synchronous frequency sweep signal and the acceleration parameter and obtaining the output signal of the system by using the order impulse response and the synchronous frequency sweep signal;
and the distortion calculation module is used for determining a distortion signal according to the output signal and the measurement signal and obtaining an average transient distortion signal by using the distortion signal.
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| CN111722109A (en) * | 2020-06-28 | 2020-09-29 | 瑞声科技(新加坡)有限公司 | Method and apparatus for measuring distortion of motor system, and computer-readable storage medium |
| CN111722108A (en) * | 2020-06-24 | 2020-09-29 | 瑞声科技(新加坡)有限公司 | Motor distortion measuring method and apparatus, computer readable storage medium |
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| WO2021097888A1 (en) | 2021-05-27 |
| CN110907827B (en) | 2022-04-01 |
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