CN104753429A - Computing method and device of magnetic pole number of compressor motor of air conditioner - Google Patents
Computing method and device of magnetic pole number of compressor motor of air conditioner Download PDFInfo
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- CN104753429A CN104753429A CN201510144727.1A CN201510144727A CN104753429A CN 104753429 A CN104753429 A CN 104753429A CN 201510144727 A CN201510144727 A CN 201510144727A CN 104753429 A CN104753429 A CN 104753429A
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Abstract
The invention discloses a computing method and device of magnetic pole number of a compressor motor of an air conditioner. The computing method includes as the compressor motor is in the low-frequency state, sampling DC (direct current) side voltage of a frequency converter of the compressor motor to obtain sample voltage; subjecting the sample voltage to filtering to obtain DC voltage component, and obtaining AC (alternating current) voltage component based on the sample voltage and the DC voltage component; processing the AC voltage component through a single-phase locked loop to obtain first angular speed; according to the first angular speed and estimated angular speed of the compressor motor, computing the magnetic pole number of the compressor motor. By the use of the computing method, the magnetic pole number is easily obtained according to the DC side voltage and the estimated angular speed, without additional cost.
Description
Technical field
The present invention relates to air conditioner technical field, particularly the calculation element of the magnetic pole logarithm of compressor electric motor in the computational methods of the magnetic pole logarithm of compressor electric motor and a kind of air conditioner in a kind of air conditioner.
Background technology
In air conditioner, because compressor is placed in off-premises station usually, therefore the model of compressor is easy to wearing and tearing, comes off or covered etc., makes troubles to maintenance process.
Due to the model of compressor cannot be obtained quickly and efficiently, therefore the parameter of compressor electric motor cannot just be determined, as resistance, inductance, magnetic pole logarithm etc., particularly for the compressor electric motor adopting vector control strategy, the parameter of Obtaining Accurate compressor electric motor is particularly important.
If the setting parameter of compressor electric motor is unreasonable or inaccurate, will directly cause compressor electric motor normally to run, therefore, the parameter obtaining compressor electric motor accurately just seems very important.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.
For this reason, one object of the present invention is the computational methods of the magnetic pole logarithm of compressor electric motor in the air conditioner of the magnetic pole logarithm proposing a kind of angular speed Obtaining Accurate compressor electric motor that can be obtained by DC voltage and estimation.
Another object of the present invention is the calculation element of the magnetic pole logarithm proposing compressor electric motor in a kind of air conditioner.
For achieving the above object, one aspect of the present invention embodiment proposes the computational methods of the magnetic pole logarithm of compressor electric motor in a kind of air conditioner, comprise the following steps: S1, when described compressor electric motor runs on low frequency state, sample to obtain sampled voltage to the DC voltage of the frequency converter of described compressor electric motor; S2, carries out filtering process to obtain DC voltage component to described sampled voltage, and obtains alternating current voltage component according to described sampled voltage and described DC voltage component; S3, processes to obtain the first angular speed to described alternating current voltage component by single-phase phase-locked loop; And S4, according to the magnetic pole logarithm estimating compressor electric motor described in the angular speed of described compressor electric motor and described first angular speed calculation that obtain.
According to the computational methods of the magnetic pole logarithm of compressor electric motor in the air conditioner of the embodiment of the present invention, when compressor electric motor runs on low frequency state, first sample to obtain sampled voltage to the DC voltage of the frequency converter of compressor electric motor, then filtering process is carried out to obtain DC voltage component to sampled voltage, and obtain alternating current voltage component according to sampled voltage and DC voltage component, process to obtain the first angular speed to alternating current voltage component by single-phase phase-locked loop, finally according to estimating the angular speed of compressor electric motor and the magnetic pole logarithm of the first angular speed calculation compressor electric motor that obtain.Therefore, in the air conditioner of the embodiment of the present invention, the computational methods of the magnetic pole logarithm of compressor electric motor can the magnetic pole logarithm of Obtaining Accurate compressor electric motor, and realize simple, without the need to additionally increasing cost, and reliability is high.
According to one embodiment of present invention, in step s 2, by low-pass first order filter, filtering process is carried out to described sampled voltage.
Preferably, the cut-off frequency of described low-pass first order filter can be 8-12Hz.
According to one embodiment of present invention, in step s 4 which, the angular speed of described compressor electric motor is estimated by position-sensor-free.
According to one embodiment of present invention, in step s 4 which, the magnetic pole logarithm of compressor electric motor according to following formulae discovery:
Wherein, p is the magnetic pole logarithm of described compressor electric motor, ω
0for the angular speed of described compressor electric motor, ω
1for described first angular speed.
For achieving the above object, the present invention on the other hand embodiment proposes the calculation element of the magnetic pole logarithm of compressor electric motor in a kind of air conditioner, comprise: sampling module, described sampling module is used for sampling to obtain sampled voltage to the DC voltage of the frequency converter of described compressor electric motor when described compressor electric motor runs on low frequency state; Filtration module, described filtration module is used for carrying out filtering process to obtain DC voltage component to described sampled voltage; And computing module and single-phase phase-locked loop, described computing module is used for obtaining alternating current voltage component according to described sampled voltage and described DC voltage component, described single-phase phase-locked loop is used for processing to obtain the first angular speed to described alternating current voltage component, and described computing module is also according to the magnetic pole logarithm estimating compressor electric motor described in the angular speed of described compressor electric motor and described first angular speed calculation that obtain.
According to the calculation element of the magnetic pole logarithm of compressor electric motor in the air conditioner of the embodiment of the present invention, sampling module samples to obtain sampled voltage to the DC voltage of the frequency converter of compressor electric motor when compressor electric motor runs on low frequency state, filtration module carries out filtering process to obtain DC voltage component to sampled voltage, computing module obtains alternating current voltage component according to sampled voltage and DC voltage component, single-phase phase-locked loop processes to obtain the first angular speed to alternating current voltage component, computing module is according to estimating the angular speed of compressor electric motor and the magnetic pole logarithm of the first angular speed calculation compressor electric motor that obtain.Therefore, in the air conditioner of the embodiment of the present invention, the calculation element of the magnetic pole logarithm of compressor electric motor can the magnetic pole logarithm of Obtaining Accurate compressor electric motor, and realize simple, without the need to additionally increasing cost, and reliability is high.
According to one embodiment of present invention, described filtration module is low-pass first order filter, and the cut-off frequency of described low-pass first order filter is 8-12Hz.
According to one embodiment of present invention, described computing module estimates the angular speed of described compressor electric motor by position-sensor-free.
According to one embodiment of present invention, the magnetic pole logarithm of described computing module compressor electric motor according to following formulae discovery:
Wherein, p is the magnetic pole logarithm of described compressor electric motor, ω
0for the angular speed of described compressor electric motor, ω
1for described first angular speed.
According to one embodiment of present invention, described compressor is single-rotor compressor.
Accompanying drawing explanation
Fig. 1 is the flow chart of the computational methods of the magnetic pole logarithm of compressor electric motor in the air conditioner according to the embodiment of the present invention.
The electric current of compressor electric motor that Fig. 2 is the magnetic pole logarithm of compressor electric motor according to an embodiment of the invention when being 2 and the oscillogram of DC voltage.
The electric current of compressor electric motor that Fig. 3 is the magnetic pole logarithm of compressor electric motor in accordance with another embodiment of the present invention when being 3 and the oscillogram of DC voltage.
Fig. 4 is the block diagram of the calculation element of the magnetic pole logarithm of compressor electric motor in the air conditioner according to the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
The calculation element of the magnetic pole logarithm of compressor electric motor in the computational methods of magnetic pole logarithm of compressor electric motor in the air conditioner proposed according to the embodiment of the present invention and air conditioner is described with reference to the accompanying drawings.
Fig. 1 is the flow chart of the computational methods of the magnetic pole logarithm of compressor electric motor in the air conditioner according to the embodiment of the present invention.As shown in Figure 1, in this air conditioner, the computational methods of the magnetic pole logarithm of compressor electric motor comprise the following steps:
S1, when compressor electric motor runs on low frequency state, samples to obtain sampled voltage to the DC voltage of the frequency converter of compressor electric motor.
Wherein, compressor can be single-rotor compressor.
S2, carries out filtering process to obtain DC voltage component to sampled voltage, and obtains alternating current voltage component according to sampled voltage and DC voltage component.
According to one embodiment of present invention, in this step, by low-pass first order filter, filtering process is carried out to sampled voltage.
Preferably, the cut-off frequency of low-pass first order filter can be 8-12Hz.
Particularly, when the compressor electric motor in air conditioner runs on low frequency state, consider that the torque ripple of compressor electric motor is very large under low frequency state, therefore need to carry out compensated torque to make the stabilization of speed of compressor electric motor to compressor electric motor, thus the generation of the vibration of compressor phenomenon effectively reducing rotary speed unstabilization because of compressor electric motor fixed and cause.Due to compressor electric motor run on low frequency state time, the amplitude of DC voltage periodically can fluctuate along with the rotating speed of compressor electric motor, therefore can obtain the magnetic pole logarithm of compressor electric motor by this characteristic.
When compressor electric motor runs on low frequency state, sample to obtain sampled voltage to the DC voltage of the frequency converter of compressor electric motor, then by low-pass first order filter, filtering process is carried out to obtain DC voltage component to sampled voltage.Wherein, in order to obtain effective DC voltage component, considering the accuracy of filtering lag time and filtering process, usually the cut-off frequency of low-pass first order filter being set to about 10Hz, such as, the cut-off frequency of low-pass first order filter can be set to 8-12Hz.Then the DC voltage component after the sampled voltage of acquisition and filtering process is done difference, to obtain alternating current voltage component, this alternating current voltage component is a sinusoidal quantity identical with the rotor frequency of compressor electric motor.
S3, processes to obtain the first angular speed to alternating current voltage component by single-phase phase-locked loop.
S4, according to estimating the angular speed of compressor electric motor and the magnetic pole logarithm of the first angular speed calculation compressor electric motor that obtain.
According to one embodiment of present invention, in this step, by the angular speed of position-sensor-free estimation compressor electric motor.
According to one embodiment of present invention, the magnetic pole logarithm of compressor electric motor is calculated according to following formula (1):
Wherein, p is the magnetic pole logarithm of compressor electric motor, ω
0for the angular speed of compressor electric motor, ω
1be the first angular speed.
Particularly, after obtaining alternating current voltage component according to sampled voltage and DC voltage component, calculate to obtain the first angular velocity omega to alternating current voltage component by single-phase phase-locked loop
1.
At present, because air conditioner major part is single-rotor compressor, therefore, the cycle of the stator current in compressor electric motor is change, and the angular rate of the stator obtained by position-sensor-free is also a changing value.Therefore, need to carry out low-pass filtering treatment to obtain a stable stator angular speed, i.e. the angular velocity omega of compressor electric motor to the angular rate of stator
0.
By the first angular velocity omega obtained
1with the angular velocity omega of compressor electric motor
0bring above-mentioned formula (1) into calculate, consider calculated value not necessarily integer value, therefore carry out value to obtain the magnetic pole logarithm p of compressor electric motor according to the principle rounded up.It should be noted that, if certain contingency and unpredictability may be there is using calculated value as the magnetic pole logarithm of compressor electric motor, therefore, repeatedly can calculate the magnetic pole logarithm of compressor electric motor and be averaged, such as, 10 times can be calculated to average, and then carry out value to obtain the magnetic pole logarithm of compressor electric motor according to the principle rounded up, thus effectively improve the accuracy of the magnetic pole logarithm obtaining compressor electric motor.
According to a concrete example of the present invention, the present invention will be further described below.
In order to can the magnetic pole logarithm of Obtaining Accurate compressor electric motor, test under the comparatively stable operating mode (compressor electric motor is in closed loop states, and the rotor speed of compressor electric motor is basicly stable) of compressor electric motor as far as possible.Wherein, the speed ratio when compressor electric motor is entered closed loop states by open loop situations is lower, supposes that the magnetic pole logarithm of now compressor electric motor is 3, and controls with magnetic pole logarithm 3 pairs of compressor electric motors.It should be noted that, the magnetic pole logarithm of the compressor electric motor in usual air conditioner is 2 or 3, so in the process of test, usually chooses larger magnetic pole logarithm such as 3 pairs of compressor electric motors and controls.
If the magnetic pole logarithm of the compressor electric motor of reality is 2, as shown in Figure 2, now, there is alternating component compressor electric motor (three-phase current of compressor electric motor is zero) out of service is front, and each alternating component in DC voltage comprises two current cycles of compressor electric motor electric current.It should be noted that, in fig. 2, there is larger harmonic components in the three-phase current of compressor electric motor, reason is, adds compensated torque when compressor electric motor runs on low frequency state.
If the magnetic pole logarithm of the compressor electric motor of reality is 3, as shown in Figure 3, each alternating component now in DC voltage comprises three current cycles of compressor electric motor electric current.
According to above-mentioned steps, filtering process is carried out to obtain DC voltage component to the DC voltage obtained, and the DC voltage component after the DC voltage of acquisition and filtering process is done difference, to obtain alternating current voltage component, then process to obtain the first angular velocity omega to alternating current voltage component by single-phase phase-locked loop
1.
From Fig. 2 and Fig. 3, the cycle of the electric current of compressor electric motor is change, namely cyclic variation is carried out according to two kinds of current cycles or three kinds of current cycles, the angular rate of the stator obtained also is a changing value, therefore, need to carry out low-pass filtering treatment to obtain a stable stator angular speed, i.e. the angular velocity omega of compressor electric motor to the angular rate of stator
0.
By the first angular velocity omega obtained
1with the angular velocity omega of compressor electric motor
0bring above-mentioned formula (1) into calculate, then continue acquisition first angular velocity omega
1with the angular velocity omega of compressor electric motor
0, and bring above-mentioned formula (1) into and calculate, amount to calculation 10 times, the results averaged that then will calculate, then carry out value to obtain the magnetic pole logarithm p of compressor electric motor according to the principle rounded up.
After the magnetic pole logarithm p of Obtaining Accurate compressor electric motor, the magnetic pole logarithm of the compressor electric motor of hypothesis is upgraded, to enable compressor electric motor according to Controlling model operation accurately.
In sum, according to the computational methods of the magnetic pole logarithm of compressor electric motor in the air conditioner of the embodiment of the present invention, when compressor electric motor runs on low frequency state, first sample to obtain sampled voltage to the DC voltage of the frequency converter of compressor electric motor, then filtering process is carried out to obtain DC voltage component to sampled voltage, and obtain alternating current voltage component according to sampled voltage and DC voltage component, process to obtain the first angular speed to alternating current voltage component by single-phase phase-locked loop, finally according to estimating the angular speed of compressor electric motor and the magnetic pole logarithm of the first angular speed calculation compressor electric motor that obtain.Therefore, in the air conditioner of the embodiment of the present invention, the computational methods of the magnetic pole logarithm of compressor electric motor can the magnetic pole logarithm of Obtaining Accurate compressor electric motor, and realize simple, without the need to additionally increasing cost, and reliability is high.
Fig. 4 is the block diagram of the calculation element of the magnetic pole logarithm of compressor electric motor in the air conditioner according to the embodiment of the present invention.As shown in Figure 4, in this air conditioner, the calculation element of the magnetic pole logarithm of compressor electric motor comprises sampling module 10, filtration module 20, computing module 30 and single-phase phase-locked loop 40.
Wherein, sampling module 10 samples to obtain sampled voltage to the DC voltage of the frequency converter of compressor electric motor when compressor electric motor runs on low frequency state.Filtration module 20 pairs of sampled voltages carry out filtering process to obtain DC voltage component.Computing module 30 obtains alternating current voltage component according to sampled voltage and DC voltage component, single-phase phase-locked loop 40 pairs of alternating current voltage component process to obtain the first angular speed, and computing module 30 is also according to estimating the angular speed of compressor electric motor and the magnetic pole logarithm of the first angular speed calculation compressor electric motor that obtain.
Wherein, compressor is single-rotor compressor.
According to one embodiment of present invention, filtration module 20 is low-pass first order filter, and the cut-off frequency of low-pass first order filter is 8-12Hz.
Particularly, when the compressor electric motor in air conditioner runs on low frequency state, consider that the torque ripple of compressor electric motor is very large under low frequency state, therefore need to carry out compensated torque to make the stabilization of speed of compressor electric motor to compressor electric motor, thus the generation of the vibration of compressor phenomenon effectively reducing rotary speed unstabilization because of compressor electric motor fixed and cause.Due to compressor electric motor run on low frequency state time, the amplitude of DC voltage periodically can fluctuate along with the rotating speed of compressor electric motor, therefore can obtain the magnetic pole logarithm of compressor electric motor by this characteristic.
When compressor electric motor runs on low frequency state, the DC voltage of the frequency converter of acquisition module 10 pairs of compressor electric motors samples to obtain sampled voltage, then by filtration module 20 as low-pass first order filter carries out filtering process to obtain DC voltage component to sampled voltage.Wherein, in order to obtain effective DC voltage component, considering the accuracy of filtering lag time and filtering process, usually the cut-off frequency of low-pass first order filter being set to about 10Hz, such as, the cut-off frequency of low-pass first order filter can be set to 8-12Hz.Then the DC voltage component after the sampled voltage of acquisition and filtering process is done difference, to obtain alternating current voltage component, this alternating current voltage component is a sinusoidal quantity identical with the rotor frequency of compressor electric motor.
After obtaining alternating current voltage component according to sampled voltage and DC voltage component, calculate to obtain the first angular velocity omega by single-phase phase-locked loop 40 pairs of alternating current voltage component
1.
According to one embodiment of present invention, computing module 30 is by the angular speed of position-sensor-free estimation compressor electric motor.
According to one embodiment of present invention, computing module 30 calculates the magnetic pole logarithm of compressor electric motor according to above-mentioned formula (1).
At present, because air conditioner major part is single-rotor compressor, therefore, the cycle of the stator current in compressor electric motor is change, and the angular rate of the stator that computing module 30 is obtained by position-sensor-free is also a changing value.Therefore, need to carry out low-pass filtering treatment to obtain a stable stator angular speed, i.e. the angular velocity omega of compressor electric motor to the angular rate of stator
0.
The first angular velocity omega that computing module 30 will obtain
1with the angular velocity omega of compressor electric motor
0bring above-mentioned formula (1) into calculate, consider calculated value not necessarily integer value, therefore carry out value to obtain the magnetic pole logarithm p of compressor electric motor according to the principle rounded up.It should be noted that, if certain contingency and unpredictability may be there is using calculated value as the magnetic pole logarithm of compressor electric motor, therefore, computing module 30 repeatedly can calculate the magnetic pole logarithm of compressor electric motor and be averaged, such as, computing module 30 can calculate 10 times to average, and then carries out value to obtain the magnetic pole logarithm of compressor electric motor according to the principle rounded up, thus effectively improves the accuracy of the magnetic pole logarithm obtaining compressor electric motor.
According to a concrete example of the present invention, the present invention will be further described below.
In order to can the magnetic pole logarithm of Obtaining Accurate compressor electric motor, test under the comparatively stable operating mode (compressor electric motor is in closed loop states, and the rotor speed of compressor electric motor is basicly stable) of compressor electric motor as far as possible.Wherein, the speed ratio when compressor electric motor is entered closed loop states by open loop situations is lower, supposes that the magnetic pole logarithm of now compressor electric motor is 3, and controls with magnetic pole logarithm 3 pairs of compressor electric motors.It should be noted that, the magnetic pole logarithm of the compressor electric motor in usual air conditioner is 2 or 3, so in the process of test, usually chooses larger magnetic pole logarithm such as 3 pairs of compressor electric motors and controls.
If the magnetic pole logarithm of the compressor electric motor of reality is 2, as shown in Figure 2, now, there is alternating component compressor electric motor (three-phase current of compressor electric motor is zero) out of service is front, and each alternating component in DC voltage comprises two current cycles of compressor electric motor electric current.It should be noted that, in fig. 2, there is larger harmonic components in the three-phase current of compressor electric motor, reason is, adds compensated torque when compressor electric motor runs on low frequency state.
If the magnetic pole logarithm of the compressor electric motor of reality is 3, as shown in Figure 3, each alternating component now in DC voltage comprises three current cycles of compressor electric motor electric current.
The DC voltage that filtration module 20 pairs of acquisition modules 10 obtain carries out filtering process to obtain DC voltage component, DC voltage component after the DC voltage of acquisition and filtering process is done difference by computing module 30, to obtain alternating current voltage component, then process to obtain the first angular velocity omega by single-phase phase-locked loop 40 pairs of alternating current voltage component
1.
From Fig. 2 and Fig. 3, the cycle of the electric current of compressor electric motor is change, namely cyclic variation is carried out according to two kinds of current cycles or three kinds of current cycles, the angular rate of the stator obtained also is a changing value, therefore, need to carry out low-pass filtering treatment to obtain a stable stator angular speed, i.e. the angular velocity omega of compressor electric motor to the angular rate of stator
0.
The first angular velocity omega that computing module 30 will obtain
1with the angular velocity omega of compressor electric motor
0bring above-mentioned formula (1) into calculate, then continue acquisition first angular velocity omega
1with the angular velocity omega of compressor electric motor
0, and bring above-mentioned formula (1) into and calculate, amount to calculation 10 times, then computing module 30 results averaged that will calculate, then carry out value to obtain the magnetic pole logarithm p of compressor electric motor according to the principle rounded up.
After the magnetic pole logarithm p of Obtaining Accurate compressor electric motor, the magnetic pole logarithm of the compressor electric motor of hypothesis is upgraded, to enable compressor electric motor according to Controlling model operation accurately.
According to the calculation element of the magnetic pole logarithm of compressor electric motor in the air conditioner of the embodiment of the present invention, sampling module samples to obtain sampled voltage to the DC voltage of the frequency converter of compressor electric motor when compressor electric motor runs on low frequency state, filtration module carries out filtering process to obtain DC voltage component to sampled voltage, computing module obtains alternating current voltage component according to sampled voltage and DC voltage component, single-phase phase-locked loop processes to obtain the first angular speed to alternating current voltage component, computing module is according to estimating the angular speed of compressor electric motor and the magnetic pole logarithm of the first angular speed calculation compressor electric motor that obtain.Therefore, in the air conditioner of the embodiment of the present invention, the calculation element of the magnetic pole logarithm of compressor electric motor can the magnetic pole logarithm of Obtaining Accurate compressor electric motor, and realize simple, without the need to additionally increasing cost, and reliability is high.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (10)
1. the computational methods of the magnetic pole logarithm of compressor electric motor in air conditioner, is characterized in that, comprise the following steps:
S1, when described compressor electric motor runs on low frequency state, samples to obtain sampled voltage to the DC voltage of the frequency converter of described compressor electric motor;
S2, carries out filtering process to obtain DC voltage component to described sampled voltage, and obtains alternating current voltage component according to described sampled voltage and described DC voltage component;
S3, processes to obtain the first angular speed to described alternating current voltage component by single-phase phase-locked loop; And
S4, according to the magnetic pole logarithm estimating compressor electric motor described in the angular speed of described compressor electric motor and described first angular speed calculation that obtain.
2. the computational methods of the magnetic pole logarithm of compressor electric motor in air conditioner as claimed in claim 1, is characterized in that, in step s 2, carry out filtering process by low-pass first order filter to described sampled voltage.
3. the computational methods of the magnetic pole logarithm of compressor electric motor in air conditioner as claimed in claim 2, it is characterized in that, the cut-off frequency of described low-pass first order filter is 8-12Hz.
4. the computational methods of the magnetic pole logarithm of compressor electric motor in air conditioner as claimed in claim 1, be is characterized in that, in step s 4 which, estimated the angular speed of described compressor electric motor by position-sensor-free.
5. the computational methods of the magnetic pole logarithm of compressor electric motor in air conditioner as claimed in claim 1, is characterized in that, in step s 4 which, and the magnetic pole logarithm of compressor electric motor according to following formulae discovery:
Wherein, p is the magnetic pole logarithm of described compressor electric motor, ω
0for the angular speed of described compressor electric motor, ω
1for described first angular speed.
6. the calculation element of the magnetic pole logarithm of compressor electric motor in air conditioner, is characterized in that, comprising:
Sampling module, described sampling module is used for sampling to obtain sampled voltage to the DC voltage of the frequency converter of described compressor electric motor when described compressor electric motor runs on low frequency state;
Filtration module, described filtration module is used for carrying out filtering process to obtain DC voltage component to described sampled voltage; And
Computing module and single-phase phase-locked loop, described computing module is used for obtaining alternating current voltage component according to described sampled voltage and described DC voltage component, described single-phase phase-locked loop is used for processing to obtain the first angular speed to described alternating current voltage component, and described computing module is also according to the magnetic pole logarithm estimating compressor electric motor described in the angular speed of described compressor electric motor and described first angular speed calculation that obtain.
7. the calculation element of the magnetic pole logarithm of compressor electric motor in air conditioner as claimed in claim 6, it is characterized in that, described filtration module is low-pass first order filter, and the cut-off frequency of described low-pass first order filter is 8-12Hz.
8. the calculation element of the magnetic pole logarithm of compressor electric motor in air conditioner as claimed in claim 6, it is characterized in that, described computing module estimates the angular speed of described compressor electric motor by position-sensor-free.
9. the calculation element of the magnetic pole logarithm of compressor electric motor in air conditioner as claimed in claim 6, is characterized in that, the magnetic pole logarithm of described computing module compressor electric motor according to following formulae discovery:
Wherein, p is the magnetic pole logarithm of described compressor electric motor, ω
0for the angular speed of described compressor electric motor, ω
1for described first angular speed.
10. in the air conditioner according to any one of claim 6-9, the calculation element of the magnetic pole logarithm of compressor electric motor, is characterized in that, described compressor is single-rotor compressor.
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| CN107623471A (en) * | 2017-08-18 | 2018-01-23 | 上海辛格林纳新时达电机有限公司 | A kind of motor number of pole-pairs self-learning method and driver |
| CN108832861A (en) * | 2018-08-14 | 2018-11-16 | 四川虹美智能科技有限公司 | A kind of compressor number of pole-pairs discrimination method and device |
| CN108964551A (en) * | 2018-07-12 | 2018-12-07 | 四川虹美智能科技有限公司 | A kind of method and device of determining freezer compressor number of pole-pairs |
| CN109639201A (en) * | 2019-01-04 | 2019-04-16 | 四川虹美智能科技有限公司 | A kind of motor number of pole-pairs discrimination method and device |
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| CN107623471B (en) * | 2017-08-18 | 2019-09-20 | 上海辛格林纳新时达电机有限公司 | A kind of motor number of pole-pairs self-learning method and driver |
| CN108964551A (en) * | 2018-07-12 | 2018-12-07 | 四川虹美智能科技有限公司 | A kind of method and device of determining freezer compressor number of pole-pairs |
| CN108964551B (en) * | 2018-07-12 | 2020-03-27 | 四川虹美智能科技有限公司 | Method and device for determining number of pole pairs of refrigerator compressor |
| CN108832861A (en) * | 2018-08-14 | 2018-11-16 | 四川虹美智能科技有限公司 | A kind of compressor number of pole-pairs discrimination method and device |
| CN109639201A (en) * | 2019-01-04 | 2019-04-16 | 四川虹美智能科技有限公司 | A kind of motor number of pole-pairs discrimination method and device |
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