CN109104129A - A kind of running down revolving speed of magnetic suspension compressor is from discrimination method and system - Google Patents
A kind of running down revolving speed of magnetic suspension compressor is from discrimination method and system Download PDFInfo
- Publication number
- CN109104129A CN109104129A CN201811070461.0A CN201811070461A CN109104129A CN 109104129 A CN109104129 A CN 109104129A CN 201811070461 A CN201811070461 A CN 201811070461A CN 109104129 A CN109104129 A CN 109104129A
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- Prior art keywords
- magnetic suspension
- voltage
- line voltage
- phase
- motor
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
- H02P21/18—Estimation of position or speed
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2203/00—Indexing scheme relating to controlling arrangements characterised by the means for detecting the position of the rotor
- H02P2203/03—Determination of the rotor position, e.g. initial rotor position, during standstill or low speed operation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Compressor (AREA)
Abstract
The present invention relates to a kind of running down revolving speeds of magnetic suspension compressor from discrimination method and system, and method includes: to acquire the three-phase line voltage of motor when detecting the electric current of supply lines of the motor is zero；The three-phase line voltage is converted into two phases line voltages；Two phases line voltage after conversion is carried out marking change, is marked change value；Motor speed is calculated according to the mark change value.Technical solution provided by the invention changes phase locked algorithm by line voltage mark, realize the accurate recognition of gamut revolving speed during magnetic suspension compressor running down, avoid bearing controller because revolving speed inaccuracy caused by imbalance compensation Problem of Failure, improve the reliability of magnetic suspension compressor.
Description
Technical field
The invention belongs to recognize the running down revolving speed of control field more particularly to a kind of magnetic suspension compressor certainly from discrimination method
And system.
Background technique
Magnetic suspension compressor uses magnetic suspension, and contactless rotation between axis and bearing reduces energy loss, using integrated
The high-speed two-stage compressor of frequency conversion drive reduces revolving speed, to degrade in the case where condensation temperature declines or thermic load declines
Energy consumption.Since magnetic suspension compressor has the characteristics that above, and it is widely used.
The control of magnetic suspension compressor includes two large divisions: motor driven and bearing control (except passive bearing), is closed
Machine is different from common compressor, and bearing control needs continue working during shaft is by inertia running down after shutdown, maintains shaft
Stable suspersion, until motor speed can just stop working after being down to 0.The amount of unbalance of shaft can bring very big to bearing control
Influence, the phenomenon that will appear shaft crash protection bearing when serious, therefore need to carry out imbalance compensation control, imbalance compensation
Key be the revolving speed for needing motor real-time motion.Motor has the algorithm of more maturation that can accurately estimate during normal driving
Calculate rotary rpm, but these methods are often not suitable for when shutting down running down, at this time bearing when carrying out imbalance compensation very
It is easy unstability, the protection bearing of magnetic suspension compressor can be damaged when serious.
Accordingly, it is desirable to provide a kind of running down revolving speed of magnetic suspension compressor solves the prior art from discrimination method and system
Deficiency.
Summary of the invention
Revolving speed is imponderable when in order to solve the problems, such as motor stopping running down in the prior art, and the present invention provides a kind of magnetic
The running down revolving speed of suspension compressor is from discrimination method and system.
From discrimination method, the magnetic suspension compressor includes motor and bearing for a kind of running down revolving speed of magnetic suspension compressor,
The described method includes:
When detecting the electric current of supply lines of the motor is zero, the three-phase line voltage of motor is acquired；
The three-phase line voltage is converted into two phases line voltages；
Two phases line voltage after conversion is carried out marking change, is marked change value；
Motor speed is calculated according to the mark change value.
Further, the three-phase line voltage is converted into two phases line voltages, comprising:
The three-phase line voltage is coordinately transformed, two phases line voltages under two-phase stationary coordinate system are obtained.
Further, the coordinate transform is shown below:
Wherein, eαAnd eβRespectively component of the line voltage under two-phase stationary coordinate system；eabAnd ebcRespectively line voltage exists
Component under three-phase static coordinate system.
Further, two phases line voltage after conversion is carried out marking change, is marked change value, comprising:
The mark change is shown below:
Wherein,WithRespectively mark change value of the line voltage under two-phase stationary coordinate system；eαAnd eβRespectively line voltage
Component under two-phase stationary coordinate system.
Further, motor speed is calculated according to the mark change value, comprising:
Calculate the difference of the mark change value of two phases line voltages；
PI regulating calculation is carried out to the difference, obtains the actual value of motor speed.
Further, the difference of the mark change value for calculating two phases line voltages, comprising:
Shown calculating difference as the following formula:
Sin Δ θ=Δ θ
Wherein,WithRespectively mark change value of the line voltage under two-phase stationary coordinate system；ωrFor motor speed；ψfFor
Permanent magnet flux linkage；θ is the phase angle of line voltage；For the actual value at line voltage phase angle.
From identification system, the magnetic suspension compressor includes motor and bearing for a kind of running down revolving speed of magnetic suspension compressor,
The system comprises:
The current detection circuit being connected with the supply lines of the motor, the current detection circuit are detecting the confession
When the electric current of electric wire is zero, output control signal；
Voltage detecting circuit, the control terminal of the voltage detecting circuit are connected with the output end of the current detection circuit
It connects, collection terminal is connected with the three-phase electricity crimping of the motor；The control terminal of the voltage detecting circuit receives control signal
When acquire the voltage of the three-phase electricity crimping；
Voltage conversion circuit, the input terminal of the voltage conversion circuit are connect with the voltage detecting circuit, and being used for will be electric
The voltage of voltage conversion circuit acquisition is converted into two-phase voltage；
Mark changes processing circuit, and the input terminal that the mark changes processing circuit is connect with the voltage conversion circuit；
Calculator, the calculator is changed processing circuit with the mark and is connect, for calculating the revolving speed of motor.
Further, the voltage detecting circuit is difference sample circuit.
Further, the calculator includes: sequentially connected comparator, pi regulator and integrator.
A kind of magnetic suspension compressor, the running down revolving speed including magnetic suspension compressor described in above-mentioned any one recognizes certainly is
System.
Technical solution provided by the invention has the advantages that compared with the immediate prior art
Technical solution provided by the invention acquires motor when detecting that the electric current of supply lines of the motor is zero first
Three-phase line voltage, then three-phase line voltage is converted by two phases line voltages by coordinate transform, two phases line voltages mark
Change, which is handled, is marked change value, finally calculates motor speed according to mark change value.The present invention changes locking phase by line voltage mark and calculates
Method realizes the accurate recognition of gamut revolving speed during magnetic suspension compressor running down, avoids bearing controller because of revolving speed not
Imbalance compensation Problem of Failure, improves the reliability of magnetic suspension compressor caused by accurate.
Detailed description of the invention
Fig. 1 is flow chart of the present invention；
Fig. 2 is the coordinate system transformation schematic diagram of three phase transformation two-phases in the embodiment of the present invention；
Fig. 3 is the Speed Identification principle assumption diagram in the embodiment of the present invention based on line voltage phaselocked loop；
Fig. 4 is difference sample circuit schematic diagram in the embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
As shown in Figure 1, the present invention provides a kind of running down revolving speeds of magnetic suspension compressor from discrimination method, the magnetic suspension
Compressor includes motor and bearing, which comprises
When detecting the electric current of supply lines of the motor is zero, the three-phase line voltage of motor is acquired；
The three-phase line voltage is converted into two phases line voltages；
Two phases line voltage after conversion is carried out marking change, is marked change value；
Motor speed is calculated according to the mark change value.
In the embodiment of the present application, the three of motor is acquired when detecting that the electric current of supply lines of the motor is zero first
Phases line voltage, then three-phase line voltage is converted by two phases line voltages by coordinate transform, two phases line voltages mark at change
Reason is marked change value, finally calculates motor speed according to mark change value.The present invention changes phase locked algorithm by line voltage mark, real
The accurate recognition for having showed gamut revolving speed during magnetic suspension compressor running down, avoids bearing controller because revolving speed inaccuracy is led
The imbalance compensation Problem of Failure of cause, improves the reliability of magnetic suspension compressor.
In some embodiments of the present application, the three-phase line voltage is converted into two phases line voltages, as shown in Fig. 2, packet
It includes:
The three-phase line voltage is coordinately transformed, two phases line voltages under two-phase stationary coordinate system are obtained.
It is, three-phase line voltage is converted into α β coordinate system from ABC coordinate system.
The coordinate transform is shown below:
Wherein, eαAnd eβRespectively component of the line voltage under two-phase stationary coordinate system；eabAnd ebcRespectively line voltage exists
Component under three-phase static coordinate system.
Wherein, two phases line voltages meet following relationship under two-phase stationary coordinate system:
Wherein, θ is the angle of line voltage and A axis, the as phase angle of line voltage, ωrFor the revolving speed of motor, ψfFor permanent magnetism
Magnetic linkage or line voltage constant.
In some embodiments of the present application, for improve algorithm adaptability and robustness, to the two-phase after conversion
Line voltage carries out marking change, is marked change value, comprising:
The mark change is shown below:
Wherein,WithRespectively mark change value of the line voltage under two-phase stationary coordinate system；eαAnd eβRespectively line voltage
Component under two-phase stationary coordinate system.
In some embodiments of the present application, the mark change value calculates motor speed, comprising:
Calculate the difference of the mark change value of two phases line voltages；
PI regulating calculation is carried out to the difference, obtains the actual value of motor speed.
Shown calculating difference as the following formula:
It can be approximately considered when Δ θ is sufficiently small: sin Δ θ=Δ θ.
Pi regulator, which is designed, by angular error Δ θ calculates motor speed actual valueTo the revolving speed picked outInto
Row integratesWhen motor running down, the Speed Identification principle assumption diagram based on line voltage phaselocked loop is as shown in Figure 3.
Wherein,WithRespectively mark change value of the line voltage under two-phase stationary coordinate system；ωrFor motor speed；ψfFor
Permanent magnet flux linkage；θ is the phase angle of line voltage；For the actual value at line voltage phase angle.
Based on identical inventive concept, the present invention also provides a kind of running down revolving speeds of magnetic suspension compressor from identification system,
The magnetic suspension compressor includes motor and bearing, the system comprises:
The current detection circuit being connected with the supply lines of the motor, the current detection circuit are detecting the confession
When the electric current of electric wire is zero, output control signal；
Voltage detecting circuit, the control terminal of the voltage detecting circuit are connected with the output end of the current detection circuit
It connects, collection terminal is connected with the three-phase electricity crimping of the motor；The control terminal of the voltage detecting circuit receives control signal
When acquire the voltage of the three-phase electricity crimping；
Voltage conversion circuit, the input terminal of the voltage conversion circuit are connect with the voltage detecting circuit, and being used for will be electric
The voltage of voltage conversion circuit acquisition is converted into two-phase voltage；
Mark changes processing circuit, and the input terminal that the mark changes processing circuit is connect with the voltage conversion circuit；
Calculator, the calculator is changed processing circuit with the mark and is connect, for calculating the revolving speed of motor.
Wherein, the voltage detecting circuit is difference sample circuit, and circuit diagram is as shown in Figure 4.
Optionally, the difference sample circuit includes:
The input terminal of RC filter circuit, the RC filter circuit is connected to sampled signal terminal, for believing the sampling
It number is filtered；
Amplifying circuit, the input terminal of the amplifying circuit are connect with the output end of the RC filter circuit, for filtering
Sampled signal afterwards amplifies, and amplified sampled signal is transmitted to sampler terminal, obtains the line voltage of motor.
Optionally, the sampled signal terminal includes sampled signal first terminal and sampled signal Second terminal, the RC
Filter circuit includes:
First resistor, the first end of the first resistor are connect with the sampled signal first terminal；
Second resistance, the first end of the second resistance are connect with the sampled signal Second terminal；
First capacitor, the first end of the first capacitor are connect with the second end of the first resistor, second end ground connection；
The first end of second capacitor, second capacitor is connect with the second end of the second resistance, second end ground connection.
Optionally, the amplifying circuit includes:
Operational amplifier, the non-inverting input terminal of the operational amplifier is connect with the second end of the second resistance, described
The inverting input terminal of amplifier is connect with the second end of the first resistor；
3rd resistor, the first end of the 3rd resistor are connect with the output end of the operational amplifier, second end and institute
State the connection of sampler terminal；
The first end of third capacitor, the third capacitor is connect with the second end of the 3rd resistor, second end ground connection；
The first end of 5th resistance, the 5th resistance is connect with the inverting input terminal of the operational amplifier, output end
It is connect with the output end of the operational amplifier；
The first end of 5th capacitor, the 5th capacitor is connect with the first end of the 5th resistance, second end with it is described
The second end of 5th resistance connects.
Optionally, the difference sample circuit further include:
The first end of 4th resistance, the 4th resistance is connect with the second end of the second resistance, second end and given
The connection of power supply signal terminal；
The first end of 4th capacitor, the 4th capacitor is connect with the first end of the 4th resistance, second end with it is described
The second segment of second resistance connects.
Optionally, the calculator includes: sequentially connected comparator, pi regulator and integrator.
Mark changes the mark change value of two phases line voltages of processing circuit output respectively multiplied by more than two phases line voltage phase angles
String value and sine value are input in comparator, obtain the difference of the mark change value of two phases line voltages；The difference is input to again
It is adjusted to obtain the actual value of motor speed in pi regulator；The actual value of the motor speed is input in integrator,
Obtain the actual value at two phases line voltage phase angles.When motor running down, the Speed Identification principle assumption diagram based on line voltage phaselocked loop
As shown in Figure 3.
The present invention also provides a kind of magnetic suspension compressor, the running down including any of the above-described magnetic suspension compressor turns
Speed is from identification system.
It should be noted that, in this document, the relational terms of such as " first " and " second " or the like are used merely to one
A entity or operation with another entity or operate distinguish, without necessarily requiring or implying these entities or operation it
Between there are any actual relationship or orders.
It is understood that embodiments described herein can with hardware, software, firmware, middleware, microcode or its
Combination is to realize.For hardware realization, processing unit be may be implemented in one or more specific integrated circuit (Application
Specific Integrated Circuits, ASIC), digital signal processor (Digital Signal Processing,
DSP), digital signal processing appts (DSP Device, DSPD), programmable logic device (Programmable Logic
Device, PLD), field programmable gate array (Field-Programmable Gate Array, FPGA), general processor,
In controller, microcontroller, microprocessor, other electronic units for executing herein described function or combinations thereof.
For software implementations, the techniques described herein can be realized by executing the unit of function described herein.Software generation
Code is storable in memory and is executed by processor.Memory can in the processor or portion realizes outside the processor.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
The scope of the present invention.
In embodiment provided herein, it should be understood that disclosed device and method can pass through others
Mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or communication link of device or unit
It connects, can be electrical property, mechanical or other forms.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, the technical solution of the embodiment of the present invention is substantially
The part of the part that contributes to existing technology or the technical solution can embody in the form of software products in other words
Come, which is stored in a storage medium, including some instructions are used so that a computer equipment (can
To be personal computer, server or the network equipment etc.) execute all or part of each embodiment the method for the present invention
Step.And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, ROM, RAM, magnetic or disk etc. are various can store program
The medium of code.
It should be noted that the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, article or equipment for including a series of elements not only includes those elements, but also including
Other elements that are not explicitly listed, or further include for elements inherent to such a process, method, article, or device.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element
Process, method, article or equipment in there is also other identical elements.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of running down revolving speed of magnetic suspension compressor is from discrimination method, the magnetic suspension compressor includes motor and bearing,
It is characterized in that, which comprises
When detecting the electric current of supply lines of the motor is zero, the three-phase line voltage of motor is acquired；
The three-phase line voltage is converted into two phases line voltages；
Two phases line voltage after conversion is carried out marking change, is marked change value；
Motor speed is calculated according to the mark change value.
2. a kind of running down revolving speed of magnetic suspension compressor according to claim 1 is from discrimination method, which is characterized in that by institute
It states three-phase line voltage and is converted into two phases line voltages, comprising:
The three-phase line voltage is coordinately transformed, two phases line voltages under two-phase stationary coordinate system are obtained.
3. a kind of running down revolving speed of magnetic suspension compressor according to claim 2 is from discrimination method, which is characterized in that described
Coordinate transform is shown below:
Wherein, eαAnd eβRespectively component of the line voltage under two-phase stationary coordinate system；eabAnd ebcRespectively line voltage is in three-phase
Component under rest frame.
4. a kind of running down revolving speed of magnetic suspension compressor according to claim 1 is from discrimination method, which is characterized in that turning
Two phases line voltage after changing carries out marking change, is marked change value, comprising:
The mark change is shown below:
Wherein,WithRespectively mark change value of the line voltage under two-phase stationary coordinate system；eαAnd eβRespectively line voltage is two
Component under phase rest frame.
5. a kind of running down revolving speed of magnetic suspension compressor according to claim 1 is from discrimination method, which is characterized in that according to
The mark change value calculates motor speed, comprising:
Calculate the difference of the mark change value of two phases line voltages；
PI regulating calculation is carried out to the difference, obtains the actual value of motor speed.
6. a kind of running down revolving speed of magnetic suspension compressor according to claim 5 is from discrimination method, which is characterized in that described
Calculate the difference of the mark change value of two phases line voltages, comprising:
Shown calculating difference as the following formula:
Sin Δ θ=Δ θ
Wherein,WithRespectively mark change value of the line voltage under two-phase stationary coordinate system；ωrFor motor speed；ψfFor permanent magnetism
Magnetic linkage；θ is the phase angle of line voltage；For the actual value at line voltage phase angle.
7. a kind of running down revolving speed of magnetic suspension compressor is from identification system, the magnetic suspension compressor includes motor and bearing,
It is characterized in that, the system comprises:
The current detection circuit being connected with the supply lines of the motor, the current detection circuit are detecting the supply lines
Electric current when being zero, output control signal；
Voltage detecting circuit, the control terminal of the voltage detecting circuit are connected with the output end of the current detection circuit, adopt
Collection end is connected with the three-phase electricity crimping of the motor；The acquisition when control terminal of the voltage detecting circuit receives control signal
The voltage of the three-phase electricity crimping；
Voltage conversion circuit, the input terminal of the voltage conversion circuit are connect with the voltage detecting circuit, for turning voltage
The voltage for changing circuit acquisition is converted into two-phase voltage；
Mark changes processing circuit, and the input terminal that the mark changes processing circuit is connect with the voltage conversion circuit；
Calculator, the calculator is changed processing circuit with the mark and is connect, for calculating the revolving speed of motor.
8. a kind of running down revolving speed of magnetic suspension compressor according to claim 7 is from identification system, which is characterized in that described
Voltage detecting circuit is difference sample circuit.
9. a kind of running down revolving speed of magnetic suspension compressor according to claim 7 is from identification system, which is characterized in that described
Calculator includes: sequentially connected comparator, pi regulator and integrator.
10. a kind of magnetic suspension compressor, which is characterized in that including the magnetic suspension compression as described in claim 7-9 any one
The running down revolving speed of machine is from identification system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811070461.0A CN109104129A (en) | 2018-09-13 | 2018-09-13 | A kind of running down revolving speed of magnetic suspension compressor is from discrimination method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811070461.0A CN109104129A (en) | 2018-09-13 | 2018-09-13 | A kind of running down revolving speed of magnetic suspension compressor is from discrimination method and system |
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| Publication Number | Publication Date |
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| CN109104129A true CN109104129A (en) | 2018-12-28 |
Family
ID=64866228
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811070461.0A Pending CN109104129A (en) | 2018-09-13 | 2018-09-13 | A kind of running down revolving speed of magnetic suspension compressor is from discrimination method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111431454A (en) * | 2020-04-28 | 2020-07-17 | 中山大洋电机股份有限公司 | Method for judging reliability of estimated rotating speed of position-sensorless vector control permanent magnet motor |
-
2018
- 2018-09-13 CN CN201811070461.0A patent/CN109104129A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111431454A (en) * | 2020-04-28 | 2020-07-17 | 中山大洋电机股份有限公司 | Method for judging reliability of estimated rotating speed of position-sensorless vector control permanent magnet motor |
| CN111431454B (en) * | 2020-04-28 | 2021-09-21 | 中山大洋电机股份有限公司 | Method for judging reliability of estimated rotating speed of position-sensorless vector control permanent magnet motor |
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