CN107659235A - A kind of simple on-line monitoring technique of permagnetic synchronous motor magnetic property decay - Google Patents
A kind of simple on-line monitoring technique of permagnetic synchronous motor magnetic property decay Download PDFInfo
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- CN107659235A CN107659235A CN201710709901.1A CN201710709901A CN107659235A CN 107659235 A CN107659235 A CN 107659235A CN 201710709901 A CN201710709901 A CN 201710709901A CN 107659235 A CN107659235 A CN 107659235A
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- synchronous motor
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- permagnetic synchronous
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- circuit
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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
- H02P21/22—Current control, e.g. using a current control loop
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/04—Measuring direction or magnitude of magnetic fields or magnetic flux using the flux-gate principle
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
-
- 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
- H02P21/141—Flux estimation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
- H02P25/024—Synchronous motors controlled by supply frequency
-
- 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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
-
- 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
- H02P2205/00—Indexing scheme relating to controlling arrangements characterised by the control loops
- H02P2205/01—Current loop, i.e. comparison of the motor current with a current reference
-
- 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
- H02P2205/00—Indexing scheme relating to controlling arrangements characterised by the control loops
- H02P2205/07—Speed loop, i.e. comparison of the motor speed with a speed reference
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses a kind of simple on-line monitoring technique of permagnetic synchronous motor magnetic property decay, current transformer by being installed on inverter output terminal collects motor stator winding electric current, it is excitation component Id and torque component Iq that frequency converter core controller carries out coordinate transform by the decoupling of motor stator current phasor by using vector control algorithm, according to permagnetic synchronous motor Formula of Electromagnetic, stator current is caused to be completely used for producing electromagnetic torque using the control mode can of Id=0.In this mode, Frequency Converter Control motor progressivelyes reach rated frequency, now, the back-emf that motor stator induces can be equivalent to frequency converter output voltage, relation according to back-emf and magnetic linkage obtains the size of magnetic flux in magnetic circuit, so as to judge the attenuation of permanent-magnetism synchronous motor permanent magnetic body magnetic property.The magnitude of voltage being calculated and permanent magnet magnetic performance attenuation percentage are passed to host computer by serial communication and shown by core controller, realize on-line monitoring.The technical operation is simple, is easily achieved, the industrial automation scene that can be applied under general require.The invention has the advantages that it is simple in construction, it is practical.
Description
Technical field
The present invention relates to industrial automation, particularly a kind of simple on-line monitoring of permagnetic synchronous motor magnetic property decay
Technology.
Background technology
At present, permagnetic synchronous motor is widely used in needing the industrial automation of motor drag to lead because of its excellent performance
Domain.Compared with direct current generator, it does not have the commutator of direct current generator and a brush, and rotor uses permanent magnet, thus simple in construction, just
Reduced in maintenance, trouble point；Compared with asynchronous motor, due to not needing idle exciting current, thus efficiency high, power factor
Height, rotary inertia are big, and stator current and stator resistance loss reduce, and rotor parameter can be surveyed, and control performance is good.Permanent magnet synchronous electric
Machine control uses advanced vector control scheme with frequency converter, can realize to motor high accuracy, high dynamic performance, on a large scale
Speed regulating control.Increasingly mature reliable with permanent magnet and permagnetic synchronous motor control technology, permagnetic synchronous motor will turn into
The mainstream model of motor Qu Donglingyu, its application prospect are boundless.
Because in permagnetic synchronous motor actual motion, irreversible move back can occur for permanent magnet under the conditions of high temperature or high current
Magnetic, no-load emf is caused to decline, motor performance is degenerated, and even motor damage can be caused when serious.Therefore, it is normal for guarantee motor
Operation, it is necessary to monitored in real time to the magnetic property attenuation of motor internal permanent magnet.Traditional flux measurement method includes
The methods of Kalman filter, observation of loss of excitation state estimations, there is the shortcomings that algorithm is complicated, should not implement in these methods, right
In general less demanding working condition, it can realize that the magnetic property of permanent magnet monitors in real time using simple on-line monitoring technique.
The content of the invention
The invention aims to solve the above problems, devise a kind of permagnetic synchronous motor magnetic property decay and simply exist
Line monitoring technology.
Realize above-mentioned purpose the technical scheme is that, a kind of simple on-line monitoring of permagnetic synchronous motor magnetic property decay
Technology, including current transformer, frequency-variable controller, permagnetic synchronous motor, host computer,
1）Permagnetic synchronous motor carries out VFC by frequency-variable controller, and three-phase alternating current is whole by what is be constituted by a diode
Bridge rectification is flowed, forms direct current, the inversion unit inversion being then made up of IGBT goes out the alternating current of voltage and changeable frequency, i.e., real
Now hand over orthogonal conversion.In the process, drive signal caused by needs is calculated using vector control algorithm in dsp controller,
IGBT on off state is controlled, realizes whole reversals；
2）Control algolithm uses the control mode of Id=0 in vector control scheme, and now, control system only needs to control Iq can
To control the size of electromagnetic torque;
3）Operation frequency converter is run under rated frequency, and motor stator back-emf is calculated by vector operation in controller, by
Smaller in winding impedance, caused pressure drop in the loop can be neglected, and the back-emf can be equivalent to motor terminal voltage, root in theory
The size of magnetic flux in magnetic circuit is obtained according to the relation of back-emf and magnetic linkage, so as to judge declining for permanent-magnetism synchronous motor permanent magnetic body magnetic property
Subtract situation.
4）Frequency converter controller sends host computer to by SCI communication modules, and host computer receives what controller transmitted
Data message is simultaneously shown, realizes on-line checking.
The current transformer is fed back by acquisition circuit electric current to core controller, and stator-induced electromagnetic is calculated
Kinetic potential, it can effectively replace magnetic linkage opening relationships in motor terminal voltage, with loop to obtain the size of magnetic flux, break according to magnetic flux and permanent magnetism
The attenuation of synchronous motor permanent magnetic body magnetic property, it is simple to operate, it is easy to accomplish, disclosure satisfy that general operating mode field application bar
Part.
Need before the permagnetic synchronous motor startup optimization to carry out parameter identification, obtain motor internal relevant parameter and
Current rotor position, in order to establish out correct motor model and motor is controlled using rational control mode, from
And ensure motor can normal operation, easily cause the step-out of motor and driving phenomenon if directly initiating.
Controller uses synchronous machine vector control algorithm, and it is excitation to be decoupled motor stator current phasor by coordinate transform
Component Id and torque component Iq, according to permagnetic synchronous motor Formula of Electromagnetic, it is fixed to be caused using the control mode can of Id=0
Electron current is completely used for producing electromagnetic torque.This is controlled similarly to DC MOTOR CONTROL mode, is easy to Digital Implementation and energy
Realize linear changing relation of the output torque with electric current, speed-regulating range width.
The current signal that the current transformer collects need to be converted into core controller AD using level shifting circuit and adopt
0~3.3V voltage signals access sample circuit required for sample circuit, is calculated so as to participate in house software algorithm.
Connected between the frequency converter core controller and current transformer by fault comprehensive protection circuit, fault comprehensive
The electric current that protection circuit is collected by current transformer carries out logic judgment, if judged result is abnormal signal, will lead back
Road and frequency converter controller are powered off, to play a protective role, while frequency converter core controller can send fault-signal to
Host computer, related personnel is notified to be overhauled.
Connected between the frequency converter controller and permagnetic synchronous motor by photoelectric isolating circuit, photoelectric isolating circuit will
Controller and the drive circuit of outside are kept apart so that and the change of external circuit is unlikely to influence or damage control system,
So as to improve the reliability of system, ability is disturbed in enhancing anti-thousand.
Embedded communication processing module include in the host computer, can by serial port communicating protocol and frequency-variable controller it
Between set up communication contact, the data transfers such as the magnetic property attenuation percentage of the state of frequency converter including permagnetic synchronous motor are given
Host computer, then shown by the touch-screen on host computer, realize on-line monitoring.Host computer can be integrated in higher level's industry collection control system
In system, the Global Macros function to live frequency converter and motor is implemented in combination with complex protection device.
The permagnetic synchronous motor is connected with external power source by rectification circuit, and rectifier circuit rectifies circuit is mainly by rectification
Diode forms.Voltage after rectification circuit has not been alternating voltage, but one kind containing DC voltage and exchanges
The mixed-voltage of voltage.
It is connected between the rectification circuit and permagnetic synchronous motor by light-coupled isolation with drive circuit, light-coupled isolation is with driving
Dynamic circuit can be isolated major loop and frequency converter controller, and signal can be complete with input with one-way transmission, output end
Electrical isolation is realized, output signal is on input without influence, and strong antijamming capability, working stability is contactless, service life
Long, efficiency of transmission is high, may also function as the effect of protection frequency converter controller.
The title made using technical scheme, decayed using the permagnetic synchronous motor magnetic property and simply supervised online
Survey technology, there is the characteristics of simple to operate, easily to realize, the magnetic property of permanent-magnetism synchronous motor permanent magnetic body can be checked in time, prevented
The various electrical faults occurred in motor operation by demagnetization occur.
Brief description of the drawings
Fig. 1 is the simple on-line monitoring technique implementation principle schematic diagram of permagnetic synchronous motor magnetic property decay of the present invention；
Fig. 2 is the simple on-line monitoring technique signal transmission figure of permagnetic synchronous motor magnetic property decay of the present invention.
Embodiment
The present invention is specifically described below in conjunction with the accompanying drawings, as shown in Figure 1-2, a kind of permagnetic synchronous motor magnetic property declines
Subtract simple on-line monitoring technique, including current transformer, frequency-variable controller, permagnetic synchronous motor, host computer, 1）Permanent-magnet synchronous
Motor carries out VFC by frequency-variable controller, by three-phase alternating current by the rectifier bridge rectification being constituted by a diode, is formed
Direct current, the inversion unit inversion being then made up of IGBT go out the alternating current of voltage and changeable frequency, that is, realize and hand over orthogonal conversion.
In the process, dsp controller using vector control algorithm needs are calculated caused by drive signal, control IGBT switch
State, realize whole reversals；2）Control algolithm uses the control mode of Id=0 in vector control scheme, now, control system
System only needs to control the size of Iq cans control electromagnetic torque;3）Operation frequency converter is run under rated frequency, and controller leads to
Cross vector operation and motor stator back-emf is calculated, because winding impedance is smaller, caused pressure drop in the loop can be neglected, should
Back-emf can be equivalent to motor terminal voltage in theory, and the size of magnetic flux in magnetic circuit is obtained according to the relation of back-emf and magnetic linkage,
So as to judge the attenuation of permanent-magnetism synchronous motor permanent magnetic body magnetic property；4）Frequency converter controller is transmitted by SCI communication modules
To host computer, host computer receives the data message that controller transmits and shown, realizes on-line checking；The electric current is mutual
Sensor is fed back by acquisition circuit electric current to core controller, and stator-induced electromagnetic kinetic potential is calculated, and can effectively replace electricity
Magnetic linkage opening relationships obtains the size of magnetic flux in set end voltage, with loop, breaks according to magnetic flux and permanent-magnetism synchronous motor permanent magnetic body magnetic
The attenuation of performance, it is simple to operate, it is easy to accomplish, disclosure satisfy that general operating mode site application conditions；The permanent magnet synchronous electric
Need to carry out parameter identification before machine startup optimization, motor internal relevant parameter and current rotor position are obtained, in order to build
Found out correct motor model and motor is controlled using rational control mode, so as to ensure that motor can be transported normally
OK, if directly initiating the step-out and driving phenomenon for easily causing motor；Controller uses synchronous machine vector control algorithm, passes through seat
Mark change changes commanders the decoupling of motor stator current phasor as excitation component Id and torque component Iq, according to permagnetic synchronous motor electromagnetic torque
Formula, stator current is caused to be completely used for producing electromagnetic torque using the control mode can of Id=0.This is controlled similarly to
DC MOTOR CONTROL mode, it is easy to Digital Implementation and linear changing relation of the output torque with electric current, speed-regulating range width can be realized；
The current signal that the current transformer collects need to be converted into core controller AD sample circuits institute using level shifting circuit
0~3.3V voltage signals access the sample circuit needed, is calculated so as to participate in house software algorithm；The frequency converter core control
Connected between device and current transformer by fault comprehensive protection circuit, fault comprehensive protection circuit is gathered by current transformer
The electric current arrived carries out logic judgment, if judged result is abnormal signal, major loop and frequency converter controller are powered off, with
Play a protective role, while frequency converter core controller can send fault-signal to host computer, notify related personnel to be overhauled；
Connected between the frequency converter controller and permagnetic synchronous motor by photoelectric isolating circuit, photoelectric isolating circuit by controller with
Outside drive circuit is kept apart so that the change of external circuit is unlikely to influence or damage control system, so as to improve
Ability is disturbed in the reliability of system, enhancing anti-thousand；Embedded communication processing module is included in the host computer, can be led to by serial ports
Communication contact is set up between news agreement and frequency-variable controller, the magnetic property that the state of frequency converter is included to permagnetic synchronous motor declines
Subtract the data transfers such as percentage to host computer, then shown by the touch-screen on host computer, realize on-line monitoring.Host computer can
It is integrated in higher level's industry centralized control system, the Global Macros function to live frequency converter and motor is implemented in combination with complex protection device；
The permagnetic synchronous motor is connected with external power source by rectification circuit, and rectifier circuit rectifies circuit is mainly by commutation diode group
Into.Voltage after rectification circuit has not been alternating voltage, but a kind of mixed containing DC voltage and alternating voltage
Close voltage；It is connected between the rectification circuit and permagnetic synchronous motor by light-coupled isolation with drive circuit, light-coupled isolation is with driving
Dynamic circuit can be isolated major loop and frequency converter controller, and signal can be complete with input with one-way transmission, output end
Electrical isolation is realized, output signal is on input without influence, and strong antijamming capability, working stability is contactless, service life
Long, efficiency of transmission is high, may also function as the effect of protection frequency converter controller.
The characteristics of the present embodiment is the simple on-line monitoring technique implementation principle bag of permagnetic synchronous motor magnetic property decay
Include：Principle schematic for the frequency converter core control portions of permagnetic synchronous motor is as shown in Figure 1.Using electricity in running
Stream and speed double circle controling mode so that AC permanent magnet synchronous motor has a similar control characteristic of direct current generator, control Id=
0, electromagnetic torque is only controlled by Iq.Using the transducer drive permagnetic synchronous motor of this control method, there is velocity fluctuation
It is small, the characteristics of torque dynamic response is fast.
In the present embodiment, it is mutual as the frequency converter of core controller, permagnetic synchronous motor, motor side electric current using DSP
Sensor and host computer.In the process of running, the current signal of motor side current transformer collection motor stator winding, frequency converter
Controller carries out algorithm control and realizes that magnetic flux calculates, and host computer receives the data message that controller transmits and shown
Show, realize on-line checking, the simple on-line monitoring technique of permagnetic synchronous motor magnetic property decay can be to realize electric motor protecting function
Strong foundation is provided, because it has the characteristics of simple to operate, easily to realize, permanent-magnetism synchronous motor permanent magnetic body can be checked in time
Magnetic property attenuation, the various electrical faults for preventing from by demagnetization occurring in motor operation occur.
In the present embodiment, above-mentioned technical proposal only embodies the optimal technical scheme of technical solution of the present invention, this skill
The technical staff in art field embodies the principle of the present invention to some variations that some of which part may be made, and belongs to this
Within the protection domain of invention.
Claims (10)
- The simple on-line monitoring technique 1. a kind of permagnetic synchronous motor magnetic property is decayed, including current transformer, frequency-variable controller, forever Magnetic-synchro motor, host computer, it is characterised in that1）Permagnetic synchronous motor carries out VFC by frequency-variable controller, and three-phase alternating current is whole by what is be constituted by a diode Bridge rectification is flowed, forms direct current, the inversion unit inversion being then made up of IGBT goes out the alternating current of voltage and changeable frequency, i.e., real Orthogonal conversion is now handed over, in the process, drive signal caused by needs is calculated using vector control algorithm in dsp controller, IGBT on off state is controlled, realizes whole reversals；2）Control algolithm uses the control mode of Id=0 in vector control scheme, and now, control system only needs to control Iq can To control the size of electromagnetic torque;3）Operation frequency converter is run under rated frequency, and motor stator back-emf is calculated by vector operation in controller, by Smaller in winding impedance, caused pressure drop in the loop can be neglected, and the back-emf can be equivalent to motor terminal voltage, root in theory The size of magnetic flux in magnetic circuit is obtained according to the relation of back-emf and magnetic linkage, so as to judge declining for permanent-magnetism synchronous motor permanent magnetic body magnetic property Subtract situation, 4）Frequency converter controller sends host computer to by SCI communication modules, and host computer receives the number that controller transmits It is believed that ceasing and being shown, on-line monitoring is realized.
- The simple on-line monitoring technique 2. a kind of permagnetic synchronous motor magnetic property according to claim 1 is decayed, its feature exist In, the current transformer is fed back by acquisition circuit electric current to core controller, and stator-induced electromagnetic kinetic potential is calculated, It can effectively replace magnetic linkage opening relationships in motor terminal voltage, with loop to obtain the size of magnetic flux, break according to magnetic flux and permanent-magnet synchronous The attenuation of motor permanent magnet magnetic property, it is simple to operate, it is easy to accomplish, disclosure satisfy that general operating mode site application conditions.
- The simple on-line monitoring technique 3. a kind of permagnetic synchronous motor magnetic property according to claim 1 is decayed, its feature exist Need to carry out parameter identification before, the permagnetic synchronous motor startup optimization, obtain motor internal relevant parameter and current Rotor-position, in order to establish out correct motor model and be controlled using rational control mode to motor, so as to protect Demonstrate,prove motor can normal operation, easily cause the step-out of motor and driving phenomenon if directly initiating.
- The simple on-line monitoring technique 4. a kind of permagnetic synchronous motor magnetic property according to claim 3 is decayed, its feature exist In controller uses synchronous machine vector control algorithm, and it is excitation component to be decoupled motor stator current phasor by coordinate transform Id and torque component Iq, according to permagnetic synchronous motor Formula of Electromagnetic, make it that stator is electric using the control mode can of Id=0 Stream is completely used for producing electromagnetic torque, and this is controlled similarly to DC MOTOR CONTROL mode, is easy to Digital Implementation and can realize Output torque is with the linear changing relation of electric current, speed-regulating range width.
- The simple on-line monitoring technique 5. a kind of permagnetic synchronous motor magnetic property according to claim 1 is decayed, its feature exist In the current signal that the current transformer collects need to be converted into core controller AD sample circuits using level shifting circuit Required 0~3.3V voltage signals access sample circuit, is calculated so as to participate in house software algorithm.
- The simple on-line monitoring technique 6. a kind of permagnetic synchronous motor magnetic property according to claim 1 is decayed, its feature exist In, connected between the frequency converter core controller and current transformer by fault comprehensive protection circuit, fault comprehensive protection The electric current that circuit is collected by current transformer carries out logic judgment, if judged result be abnormal signal, by major loop with Frequency converter controller is powered off, and to play a protective role, while frequency converter core controller can send fault-signal to upper Machine, related personnel is notified to be overhauled.
- The simple on-line monitoring technique 7. a kind of permagnetic synchronous motor magnetic property according to claim 1 is decayed, its feature exist In, connected between the frequency converter controller and permagnetic synchronous motor by photoelectric isolating circuit, photoelectric isolating circuit will control Device and the drive circuit of outside are kept apart so that and the change of external circuit is unlikely to influence or damage control system, so as to Ability is disturbed in the reliability of raising system, enhancing anti-thousand.
- The simple on-line monitoring technique 8. a kind of permagnetic synchronous motor magnetic property according to claim 1 is decayed, its feature exist In, embedded communication processing module is included in the host computer, can be by being built between serial port communicating protocol and frequency-variable controller Communication contact is erected, the state of frequency converter is included to the data transfers such as the magnetic property attenuation percentage of permagnetic synchronous motor to upper Machine, then shown by the touch-screen on host computer, realize on-line monitoring, host computer can be integrated in higher level's industry centralized control system In, the Global Macros function to live frequency converter and motor is implemented in combination with complex protection device.
- The simple on-line monitoring technique 9. a kind of permagnetic synchronous motor magnetic property according to claim 1 is decayed, its feature exist In the permagnetic synchronous motor is connected with external power source by rectification circuit, and rectifier circuit rectifies circuit is mainly by the pole of rectification two Pipe forms, and the voltage after rectification circuit has not been alternating voltage, but one kind contains DC voltage and alternating voltage Mixed-voltage.
- The simple on-line monitoring technique 10. a kind of permagnetic synchronous motor magnetic property according to claim 1 is decayed, its feature exist In, be connected between the rectification circuit and permagnetic synchronous motor by light-coupled isolation with drive circuit, light-coupled isolation with driving electricity Road can be isolated major loop and frequency converter controller, and signal can be fully achieved with one-way transmission, output end with input Electrical isolation, output signal is on input without influence.
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| CN112332729A (en) * | 2019-07-30 | 2021-02-05 | 丹佛斯（天津）有限公司 | Compressor and control method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108983126A (en) * | 2018-05-22 | 2018-12-11 | 安徽大学 | A kind of local demagnetization fault identification device and method of linear motor secondary |
| CN108983126B (en) * | 2018-05-22 | 2020-09-08 | 安徽大学 | Device and method for identifying local demagnetization fault of secondary stage of linear motor |
| CN112332729A (en) * | 2019-07-30 | 2021-02-05 | 丹佛斯（天津）有限公司 | Compressor and control method thereof |
| US11699969B2 (en) | 2019-07-30 | 2023-07-11 | Danfoss (Tianjin) Ltd. | Compressor and method for controlling the compressor |
| CN112332729B (en) * | 2019-07-30 | 2023-12-26 | 丹佛斯（天津）有限公司 | Compressor and control method thereof |
| CN111707878A (en) * | 2020-08-19 | 2020-09-25 | 季华实验室 | Three-phase motor open-phase detection system and method |
| CN111707878B (en) * | 2020-08-19 | 2021-01-01 | 季华实验室 | Three-phase motor open-phase detection system and method |
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Application publication date: 20180202 |