CN109738798A - A kind of linear motor test method and test device - Google Patents
A kind of linear motor test method and test device Download PDFInfo
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- CN109738798A CN109738798A CN201910049773.1A CN201910049773A CN109738798A CN 109738798 A CN109738798 A CN 109738798A CN 201910049773 A CN201910049773 A CN 201910049773A CN 109738798 A CN109738798 A CN 109738798A
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Abstract
The invention discloses a kind of linear motor test methods, linear motor rotor is in stationary state, apply the input voltage of predeterminated frequency in linear motor input terminal, and obtain voltage effective value, current effective value, active power and the reactive power of linear motor input terminal, and the input voltage value and predeterminated frequency value of linear motor input terminal are improved, obtain the corresponding equivalent resistance of linear motor unifrequency and equivalent reactance and the corresponding equivalent resistance of linear motor full rate and equivalent reactance.Also disclose a kind of test device of linear motor.The electrical parameter that the present invention passes through measurement linear motor input terminal, calculate the predeterminated frequency of linear motor and equivalent resistance and equivalent reactance under full rate, more acurrate and real-time detection is realized to kinetic parameters such as the equivalent stiffness of linear compressor equipment, equivalent damping, intrinsic frequency and strokes to realize, for the analysis of compressor on-line monitoring, fault diagnosis, piston top dead center position judgement and performance evaluation.
Description
Technical field
The present invention relates to technical field of motors, in particular to a kind of linear motor test method and test device.
Background technique
New household electrical appliance Energy Efficiency Standard further increases, so that the linear compressor with significant power savings advantages becomes
The important hair of the domestic or commercial Small Refrigerating Equipment compressor such as refrigerator, refrigerator-freezer, display case, air-conditioning and electronic radiation field
Open up direction.Linear compressor is by by linear motor and compressor piston integrated design, by linear motor direct drive piston
It moves back and forth, to compress refrigerant vapour.This driving method and structure compare linear compressor to use rotating electric machine
Conventional piston formula compressor, eliminate the link that rotary motion is converted to linear motion, reduce the power consumption of friction loss, mention
High machinery driving efficiency, it is easy to accomplish few oil lubrication is not required to lubricating oil, realizes the high reliability long-life of compressor.
Linear compressor, as driver, pushes the piston connecting with electric mover in gas using Linear Synchronous vibration motor
It is moved back and forth in cylinder.Working medium is inhaled into the compression space between piston and cylinder and increases after pressure from the compression in the course of work
Space discharge, as the electromechanics one for promoting its pressure for various gas working mediums such as compressed air, refrigerant, nitrogen, helium
Body apparatus.Because of variation and intermittent the suction and discharge effect of compressed gas state parameter in its course of work, so that making
It is affected to influence compressor performance to compressor frequency characteristic for the compressed gas of linear vibration motor load.When described
In no gas load, linear compressor has by resonant springs rigidity (constant) and the compressor moving component compressor
The mechanical intrinsic frequency that quality limits.After compressor operation starts exhaust, the resonance frequency of linear compressor is by compression chamber
The joint effect of the gas spring caused by compression working medium and resonant springs.
Theoretical analysis shows that the compressor is when resonant state works, and operational efficiency highest, linear compressor at this time
Moving-mass component and resonant springs component between energy accumulation and release between there is balances, thus mentioned needed for power supply
The energy of confession be about energy consumed by compressed gas and overcome compressor moving component rub consumed by the sum of function.Pass through inspection
The change of the equivalent damping of the compressor of system and the stroke of compressor is measured, Linearkompressor operating status can be used for
On-line monitoring analysis, fault diagnosis, piston top dead center position judgement and performance evaluation.
Since usually linear motor parameter (equivalent resistance and equivalent inductance) being handled by constant in existing literature, but in reality
In the operational process of border, due to the nonlinear characteristic of motor permeability magnetic material silicon steel sheet, so that the parameter of electric machine would generally change with frequency,
And calculate electrical consumption or storage energy using the linear motor parameter of constant form there are large errors, pressure is further amplified
The calculating error of the control characteristic parameters such as contracting machine equivalent damping and stroke causes compressor control inaccurate, is easy to happen and hits cylinder
And damage compressor phenomenon.
Summary of the invention
The purpose of the embodiment of the present invention is that providing a kind of linear motor test method, pass through measurement linear motor input terminal
Electrical parameter calculates the predeterminated frequency of linear motor and equivalent resistance and equivalent reactance under full rate, to realize to straight line pressure
The kinetic parameters such as equivalent stiffness, equivalent damping, intrinsic frequency and the stroke of contracting machine equipment realize more acurrate and real-time detection,
For the analysis of compressor on-line monitoring, fault diagnosis, piston top dead center position judgement and performance evaluation.
In order to solve the above technical problems, the first aspect of the embodiment of the present invention provides a kind of linear motor test method,
Include:
S100 applies the input voltage of predeterminated frequency in linear motor input terminal；
S200 obtains voltage effective value, current effective value, active power and the idle function of the linear motor input terminal
Rate；
The input voltage value is improved the first preset ratio value by S300；
S400, input voltage described in detecting step S300 improve whether number reaches the first preset times, if "Yes"
Step S500 is executed, as "No" thens follow the steps S200；
S500 obtains the pre- of the linear motor based on the multiple groups active power and reactive power obtained in step S200
If frequency equivalent resistance and predeterminated frequency equivalent reactance；
The predeterminated frequency is improved the second preset ratio value by S600；
S700, predeterminated frequency described in detecting step S600 improve whether number reaches the second preset times, if "Yes"
Step S800 is executed, as "No" thens follow the steps S400；
Equivalent resistance described in multiple groups obtained in step S500 and equivalent reactance are fitted to the default frequency by S800 respectively
The linear equality of rate obtains the full rate equivalent resistance and full rate equivalent reactance of the linear motor.
Further, the voltage effective value for obtaining the linear motor input terminal, current effective value, active power and
Reactive power can be measured by electrical parameter instrument.
Further, the voltage effective value for obtaining the linear motor input terminal, current effective value, active power and
Reactive power, comprising: can be obtained by voltage sensor and current sensor voltage dispersion data in preset period of time and
The discrete data of electric current obtains the voltage effective value, current effective value, active power and reactive power.
Further, the voltage dispersion number obtained by voltage sensor and current sensor in preset period of time
The voltage effective value, current effective value, active power and reactive power are obtained according to electric current discrete data, comprising: are based on institute
Voltage dispersion data and electric current discrete data are stated, the voltage magnitude and voltage-phase of the linear motor input terminal voltage are obtained；
Obtain the current amplitude and current phase of the linear motor input terminal electric current；Pass through the voltage magnitude, voltage-phase, electric current
Amplitude, current phase obtain the voltage effective value, current effective value, active power and reactive power.
Further, described that the straight-line electric is obtained based on the multiple groups active power obtained in step S200 and reactive power
The predeterminated frequency equivalent resistance and predeterminated frequency equivalent reactance of machine, comprising: distinguish active power described in multiple groups and reactive power
It is fitted to the linear equality of the current effective value square, obtains the predeterminated frequency equivalent resistance and default frequency of the linear motor
Rate equivalent reactance；Alternatively,
Active power described in multiple groups is averaged to obtain the linear motor with corresponding moment current effective value square quotient
Predeterminated frequency equivalent resistance, multiple groups reactive power and corresponding moment current effective value square quotient are averaged to obtain described straight
The predeterminated frequency equivalent reactance of line motor.
Further, the range of first preset times is more than or equal to 3 times；And/or second preset times
For more than or equal to 3 times.
Further, the range of the first preset ratio value is 10%-150%；And/or second preset ratio
The range of value is 50%-150%.
The second aspect of the embodiment of the present invention provides a kind of linear motor test device, comprising:
Measuring unit, the measuring unit are electrically connected with linear motor input terminal, are in for obtaining linear motor rotor
Voltage effective value, current effective value, active power and reactive power when stationary state under predeterminated frequency；
Computing unit, the computing unit are electrically connected with the measuring unit respectively, are obtained based on the measuring unit
Voltage effective value, current effective value, active power and reactive power obtain the equivalent resistance and equivalent electricity of the linear motor
It is anti-；
Control unit, described control unit is electrically connected with the measuring unit and the computing unit respectively, described in control
Measuring unit obtains voltage effective value, current effective value, active power and the reactive power of the linear motor input terminal, and controls
The computing unit is made to obtain the voltage effective value of the linear motor input terminal to the measuring unit, current effective value, have
Function power and reactive power are calculated, to obtain the equivalent resistance and equivalent reactance of the linear motor.
Further, the equivalent resistance and equivalent reactance of the linear motor, comprising: under the linear motor predeterminated frequency
Equivalent resistance and equivalent reactance；Or, equivalent resistance and equivalent reactance under the linear motor full rate.
Further, the linear motor test device further include: display unit, the display unit and the calculating are single
Member electrical connection, for show the input voltage of the linear motor input terminal, voltage effective value, current effective value, active power,
Reactive power, equivalent resistance and/or equivalent reactance.
The above-mentioned technical proposal of the embodiment of the present invention has following beneficial technical effect:
By measure linear motor input terminal electrical parameter, calculate the predeterminated frequency of linear motor and under full rate etc.
Resistance and equivalent reactance are imitated, it is dynamic to the equivalent stiffness of linear compressor equipment, equivalent damping, intrinsic frequency and stroke etc. to realize
Mechanics parameter realizes more acurrate and real-time detection, monitors analysis, fault diagnosis, piston top dead center position on-line for compressor
Judgement and performance evaluation.
Detailed description of the invention
Fig. 1 is the circuit model figure of linear compressor provided in an embodiment of the present invention；
Fig. 2 is the flow chart of linear motor test method provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of linear motor test device provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions and advantages of the present invention clearer, With reference to embodiment and join
According to attached drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair
Bright range.In addition, in the following description, descriptions of well-known structures and technologies are omitted, to avoid this is unnecessarily obscured
The concept of invention.
Fig. 1 is the circuit model figure of linear compressor provided in an embodiment of the present invention.
Please refer to Fig. 1, the energy-balance equation that the active power and reactive power of linear compressor are constituted are as follows:
Wherein, P is power input active power, and Q is power input reactive power, and U is voltage effective value, and I has for electric current
Valid value, φuiThe phase difference between voltage and current, ReFor motor equivalent resistance；LeFor motor equivalent inductance；K0For motor electromagnetic
Force coefficient；CsgFor compressor Equivalent damping coefficient, ksgFor linear motor equivalent spring rigidity, m is electric mover quality, and ω is
Linear motor runs angular frequency, and C is capacitor in circuit, and V is speed virtual value (for displacement amplitudeTimes).Linear motor
Permeability magnetic material silicon steel sheet has nonlinear characteristic, and the equivalent resistance of linear motor and equivalent reactance is caused to be changed by frequency and become
Change.Linear motor equivalent resistance and equivalent reactance are obtained with the changing rule of frequency, it is equivalent can more accurately to obtain compressor
The control parameters such as damping and stroke.
Fig. 2 is the flow chart of linear motor test method provided in an embodiment of the present invention.
Referring to figure 2., the first aspect of the embodiment of the present invention provides a kind of linear motor test method, comprising:
S100 applies the input voltage of predeterminated frequency in linear motor input terminal.
S200 obtains voltage effective value, current effective value, active power and the reactive power of linear motor input terminal.
In an embodiment of the embodiment of the present invention, voltage effective value, the electric current for obtaining linear motor input terminal have
Valid value, active power and reactive power can directly be measured in linear motor input terminal by electrical parameter instrument.
In the another embodiment of the embodiment of the present invention, other than directly electrical parameter instrument being used to measure, straight line is obtained
The preset period of time when electrical parameter of motor can also obtain linear motor operation by voltage sensor and current sensor
The discrete data point of the voltage and current of interior linear motor input terminal.
Optionally, it is utilized respectively voltage sensor and current sensor collects a cycle when linear motor is run
(T) discrete data point of interior voltage and current, is denoted as u respectivelyk=[u1,u2,……,un] and ik=[i1,i2,……,in]。
Optionally, it is utilized respectively voltage sensor and current sensor collects multiple periods when linear motor operation
(mT) discrete data point of interior voltage and current is divided into Δ t between data sampling time, is denoted as u respectivelyk=[u1,u2,……,um]
And ik=[i1,i2,……,im], but for acquiring in multiple periods for the discrete data point of voltage and current, after progress
When continuous calculating, need from the voltage and current extracted in the discrete data point of voltage and current in multiple periods in a cycle
Discrete data point.
Using the discrete data point of linear motor input terminal voltage as voltage curve, by linear motor input terminal electric current from
Data point is dissipated as current curve, and voltage effective value U, current effective value I, active-power P and reactive power Q can be obtained.
Wherein, u (t) is using time t as the voltage continuous information of variable；I (t) is continuous as the electric current of variable using time t
Information, u (k) are the discrete data point of k-th of voltage in a time cycle；I (k) is k-th of electric current in a time cycle
Discrete data point；T is the signal time period；N is the discrete data point number in the time cycle, and Δ t is the sampling of sensor
Time interval.
Voltage dispersion data in preset period of time are obtained by voltage sensor and current sensor and electric current is discrete
Data obtain voltage effective value, current effective value, active power and reactive power, comprising: are based on voltage dispersion data and electric current
Discrete data obtains the voltage magnitude and voltage-phase of linear motor input terminal voltage；Obtain linear motor input terminal electric current
Current amplitude and current phase；Voltage effective value, electric current are obtained by voltage magnitude, voltage-phase, current amplitude, current phase
Virtual value, active power and reactive power.
By voltage dispersion numerical value and electric current discrete values, voltage magnitude Um, voltage are obtained using Fourier decomposition algorithm
Phase Φ u, current amplitude Im and current phase Φ i, and then obtain voltage effective value U, current effective value I, active-power P and nothing
Function power Q,
P=UIcos (φu-φi),
Q=UIsin (φu-φi)。
Wherein, voltage-phase ΦuWith current phase ΦiPhase difference can be based on voltage dispersion data and electric current dispersion number
It is obtained according to by hard ware measures circuit countings such as zero passage method, trigonometric function method, least square method or use phase measurement chips.
Input voltage value is improved the first preset ratio value by S300.
Input voltage improves whether number reaches the first preset times in S400, detecting step S300, executes if "Yes"
Step S500, as "No" thens follow the steps S200.
S500 obtains the pre- of the linear motor based on the multiple groups active power and reactive power obtained in step S200
If frequency equivalent resistance and predeterminated frequency equivalent reactance.
In an embodiment of the embodiment of the present invention, based on the multiple groups active power that is obtained in step S200 and idle
Power obtains the predeterminated frequency equivalent resistance and predeterminated frequency equivalent reactance of the linear motor, specifically: will have described in multiple groups
Function power and reactive power are fitted to the linear equality of the current effective value square respectively, obtain the default of the linear motor
Frequency equivalent resistance and predeterminated frequency equivalent reactance.
Optionally, multiple groups active power and reactive power are fitted to the linear equality of current effective value square respectively, linearly
The intercept of equation is respectively zero.
The equivalent resistance R of linear motor can be obtained by active-power P and current effective value Ie, i.e.,
P=ReI2。
The equivalent reactance X of linear motor can be obtained by reactive power Q and current effective value Ie, i.e.,
Q=XeI2。
In the another embodiment of the embodiment of the present invention, based on the multiple groups active power and nothing obtained in step S200
Function power obtains the predeterminated frequency equivalent resistance and predeterminated frequency equivalent reactance of the linear motor, comprising: will have described in multiple groups
Function power is averaged to obtain the predeterminated frequency equivalent resistance of the linear motor with corresponding moment current effective value square quotient, will
The predeterminated frequency that multiple groups reactive power is averaged to obtain the linear motor with corresponding moment current effective value square quotient is equivalent
Reactance.
Predeterminated frequency is improved the second preset ratio value by S600.
Predeterminated frequency improves whether number reaches the second preset times in S700, detecting step S600, executes if "Yes"
Step S800, as "No" thens follow the steps S400.
S800, by multiple groups equivalent resistance R obtained in step S500eWith equivalent reactance XeIt is fitted to predeterminated frequency respectively
Linear equality obtains the full rate equivalent resistance R of linear motore-ALLWith full rate equivalent reactance Xe-ALL。
By the multiple groups equivalent resistance R of linear motoreAnd corresponding predeterminated frequency f, the full rate of linear motor can be obtained
Equivalent resistance Re-ALL, i.e.,
Re-ALL=K1×f+Rek,
Wherein, K1It indicates Monomial coefficient, is constant；RekIt indicates fitting intercept, is constant.
By the multiple groups equivalent reactance X of linear motoreAnd corresponding predeterminated frequency f, the full rate of linear motor can be obtained
Equivalent resistance Xe-ALL, i.e.,
Xe-ALL=K2×f+Xek,
Wherein, K2It indicates Monomial coefficient, is constant；XekIt indicates fitting intercept, is constant.
Optionally, the range of the first preset times is more than or equal to 3 times, so that last time is applied on linear motor
Voltage be 1.5 times of the linear motor rated operational voltage.
Similar, the second preset times are more than or equal to 3 times, so that last time is applied to the frequency on linear motor
It is 1.5 times of the linear motor rated operation frequency.
Optionally, the range of the first preset ratio value is 10%-150%；And/or second the range of preset ratio value be
50%-150%.
Fig. 3 is the structural schematic diagram of linear motor test device provided in an embodiment of the present invention.
Referring to figure 3., the second aspect of the embodiment of the present invention provides a kind of linear motor test device, comprising: measurement
Unit, computing unit and control unit.Measuring unit is electrically connected with linear motor input terminal, for obtaining at linear motor rotor
Voltage effective value, current effective value, active power and reactive power when stationary state under predeterminated frequency.Computing unit difference
It is electrically connected with measuring unit, voltage effective value, current effective value, active power and the reactive power obtained based on measuring unit,
Obtain the equivalent resistance and equivalent reactance of linear motor.Control unit is electrically connected with measuring unit and computing unit respectively, control
Measuring unit obtains voltage effective value, current effective value, active power and the reactive power of linear motor input terminal, and controls meter
Calculate voltage effective value, current effective value, active power and reactive power that unit obtains linear motor input terminal to measuring unit
It is calculated, to obtain the equivalent resistance and equivalent reactance of linear motor.
Optionally, the equivalent resistance and equivalent reactance of linear motor, comprising: the equivalent resistance under linear motor predeterminated frequency
And equivalent reactance；Or, equivalent resistance and equivalent reactance under linear motor full rate.
In an embodiment of the embodiment of the present invention, linear motor test device further include: display unit, display are single
Member is electrically connected with computing unit, for showing the input voltage of linear motor input terminal, voltage effective value, current effective value, having
Function power, reactive power, equivalent resistance and/or equivalent reactance.
The embodiment of the present invention is intended to protect a kind of linear motor test method and test device, has following effect:
By measure linear motor input terminal electrical parameter, calculate the predeterminated frequency of linear motor and under full rate etc.
Resistance and equivalent reactance are imitated, it is dynamic to the equivalent stiffness of linear compressor equipment, equivalent damping, intrinsic frequency and stroke etc. to realize
Mechanics parameter realizes more acurrate and real-time detection, monitors analysis, fault diagnosis, piston top dead center position on-line for compressor
Judgement and performance evaluation.
It should be understood that above-mentioned specific embodiment of the invention is used only for exemplary illustration or explains of the invention
Principle, but not to limit the present invention.Therefore, that is done without departing from the spirit and scope of the present invention is any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.In addition, appended claims purport of the present invention
Covering the whole variations fallen into attached claim scope and boundary or this range and the equivalent form on boundary and is repairing
Change example.
Claims (10)
1. the stator of a kind of linear motor test method, linear motor is in stationary state, which is characterized in that including walking as follows
It is rapid:
S100 applies the input voltage of predeterminated frequency in linear motor input terminal；
S200 obtains voltage effective value, current effective value, active power and the reactive power of the linear motor input terminal；
The input voltage value is improved the first preset ratio value by S300；
S400, input voltage described in detecting step S300 improve whether number reaches the first preset times, execute if "Yes"
Step S500, as "No" thens follow the steps S200；
S500 obtains the default frequency of the linear motor based on the multiple groups active power and reactive power obtained in step S200
Rate equivalent resistance and predeterminated frequency equivalent reactance；
The predeterminated frequency is improved the second preset ratio value by S600；
S700, predeterminated frequency described in detecting step S600 improve whether number reaches the second preset times, execute if "Yes"
Step S800, as "No" thens follow the steps S400；
Equivalent resistance described in multiple groups obtained in step S500 and equivalent reactance are fitted to the predeterminated frequency by S800 respectively
Linear equality obtains the full rate equivalent resistance and full rate equivalent reactance of the linear motor.
2. linear motor test method according to claim 1, which is characterized in that
Voltage effective value, current effective value, active power and the reactive power for obtaining the linear motor input terminal, can lead to
Cross the measurement of electrical parameter instrument.
3. linear motor test method according to claim 1, which is characterized in that
Voltage effective value, current effective value, active power and the reactive power for obtaining the linear motor input terminal, packet
It includes:
The dispersion number of the voltage dispersion data and electric current in preset period of time is obtained by voltage sensor and current sensor
According to obtaining the voltage effective value, current effective value, active power and reactive power.
4. linear motor test method according to claim 3, which is characterized in that
The voltage dispersion data and electric current by voltage sensor and current sensor acquisition preset period of time are discrete
Data obtain the voltage effective value, current effective value, active power and reactive power, comprising: are based on the voltage dispersion number
According to electric current discrete data,
Obtain the voltage magnitude and voltage-phase of the linear motor input terminal voltage；
Obtain the current amplitude and current phase of the linear motor input terminal electric current；
By the voltage magnitude, voltage-phase, current amplitude, current phase obtain the voltage effective value, current effective value,
Active power and reactive power.
5. linear motor test method according to claim 1, which is characterized in that described based on obtaining in step S200
Multiple groups active power and reactive power obtain the predeterminated frequency equivalent resistance and predeterminated frequency equivalent reactance of the linear motor, packet
It includes:
Active power described in multiple groups and reactive power are fitted to the linear equality of the current effective value square respectively, obtain institute
State the predeterminated frequency equivalent resistance and predeterminated frequency equivalent reactance of linear motor；Or
Active power described in multiple groups is averaged to obtain the pre- of the linear motor with corresponding moment current effective value square quotient
If frequency equivalent resistance, multiple groups reactive power is averaged to obtain the straight-line electric with corresponding moment current effective value square quotient
The predeterminated frequency equivalent reactance of machine.
6. linear motor test method according to claim 1, which is characterized in that
The range of first preset times is more than or equal to 3 times；And/or
Second preset times are greater than or equal to 3 times.
7. linear motor test method according to claim 1, which is characterized in that
The range of the first preset ratio value is the 10%-150% of the rated operational voltage of linear motor；And/or
The range of the second preset ratio value is the 50%-150% of the rated operation frequency of linear motor.
8. a kind of test device of such as described in any item linear motor test methods of claim 1-7, which is characterized in that packet
It includes:
Measuring unit, the measuring unit are electrically connected with linear motor input terminal, are in fixation for obtaining linear motor rotor
Voltage effective value, current effective value, active power and reactive power when state under predeterminated frequency；
Computing unit, the computing unit are electrically connected with the measuring unit respectively, the voltage obtained based on the measuring unit
Virtual value, current effective value, active power and reactive power obtain the equivalent resistance and equivalent reactance of the linear motor；
Control unit, described control unit are electrically connected with the measuring unit and the computing unit respectively, control the measurement
Unit obtains voltage effective value, current effective value, active power and the reactive power of the linear motor input terminal, and controls institute
State voltage effective value, current effective value, wattful power that computing unit obtains the linear motor input terminal to the measuring unit
Rate and reactive power are calculated, to obtain the equivalent resistance and equivalent reactance of the linear motor.
9. a kind of linear motor test device according to claim 8, which is characterized in that
The equivalent resistance and equivalent reactance of the linear motor, comprising:
Equivalent resistance and equivalent reactance under the linear motor predeterminated frequency；Or
Equivalent resistance and equivalent reactance under the linear motor full rate.
10. a kind of linear motor test device according to claim 8 or claim 9, which is characterized in that further include:
Display unit, the display unit are electrically connected with the computing unit, for showing the defeated of the linear motor input terminal
Enter voltage, voltage effective value, current effective value, active power, reactive power, equivalent resistance and/or equivalent reactance.
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| CN109738798B (en) | 2021-07-09 |
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