CN109039175A - A kind of permanent magnet synchronous motor detection of loss of mains and guard method - Google Patents
A kind of permanent magnet synchronous motor detection of loss of mains and guard method Download PDFInfo
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- CN109039175A CN109039175A CN201810746408.1A CN201810746408A CN109039175A CN 109039175 A CN109039175 A CN 109039175A CN 201810746408 A CN201810746408 A CN 201810746408A CN 109039175 A CN109039175 A CN 109039175A
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- motor
- electromotive force
- inverse electromotive
- permanent magnet
- magnet synchronous
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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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
- H02P6/182—Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a kind of permanent magnet synchronous motor detection of loss of mains and guard method, this method includes the real-time inverse electromotive force that motor is calculated according to formula Eq=Uq-R*Iq；Judge the current motion state of motor, i.e. acceleration or deceleration state；The maximum value of the motor inverse electromotive force is obtained according to current motor motion state；Judge motor whether step-out；If judging result is that motor is out-of-step free, the motor is allowed to work on；If judging result is motor desynchronizing, stop motor work, the present invention can detection that is simple, being rapidly performed by motor desynchronizing, avoid complicated mathematical operation, keep testing result more accurate reliable, can effectively prevent the case where step-out occur in the motor course of work, avoid the damage of motor.
Description
Technical field
The present invention relates to electric machines test technical field, specially a kind of permanent magnet synchronous motor detection of loss of mains and guard method.
Background technique
Permanent magnet synchronous motor (PMSM) have big torque, high efficiency, rotary inertia is small, power factor is high, speed adjustable range is wide,
The advantages that structure is simple, easy to maintain, recently as the hair of electron electric power technology, permanent-magnet material technology and motor control theory etc.
Exhibition, permanent magnet synchronous motor are widely used and further investigate.
When permanent-magnetic synchronous motor stator three-phase symmetric winding is passed through three-phase phase poor 120 ° of sine-wave current, stator side will
The Sine distribution magnetic field of a rotation can be generated, the revolving speed of the magnetic field rotating is synchronous rotational speed.Direct current is passed through on rotor to encourage
Magnetoelectricity stream, rotor-side can also generate a Sine distribution magnetic field at this time.When permanent magnet synchronous motor runs well, stator field attracts
Rotor field is operated with synchronous rotational speed, and rotor field lags behind the angle stator field θ, when permanent magnet synchronous motor drags load running
When, there is equalising torques for electromagnetic torque and load torque, when the equalising torque on machine shaft is destroyed, rotor speed
It is not resynchronized with stator revolving speed, step-out phenomenon occurs in motor.
The reason of causing motor desynchronizing has very much, is broadly divided into following two: one, when rotor excitation current, voltage go out
When existing serious underexcitation, rotor field is slowly decayed, and electromagnetic torque reduces, and load torque is constant, and rotor field lag is fixed
The very big angle of sub- rotating excitation field, and then motor is caused to lose equalising torque, rotor loses synchronous rotational speed, generates step-out phenomenon；
Two, when motor load is significantly uprushed or motor blocking phenomenon occurs, load torque becomes larger, the advanced stator field in rotor field
Very wide-angle, machine shaft lose equalising torque, generate step-out.
When step-out phenomenon occurs in motor, equalising torque is destroyed, and motor will receive very big dash current and impact and turn
Square, prolonged fluctuation will lead to motor and be burned out, according to formula Eq=Ce Ф n (Ce: back EMF constant, Ф: armature mmf,
N: revolving speed) it can show that the inverse electromotive force of motor and revolving speed are directly proportional, the relationship of motor inverse electromotive force and revolving speed such as Fig. 1 institute
Show, when motor runs well, revolving speed constantly rises as time increases, and inverse electromotive force constantly rises, and turns when reaching target
When fast, revolving speed is constant, and inverse electromotive force is also constant, once step-out phenomenon occurs in motor, motor speed is begun to decline, while reversed
Electromotive force reduces, and using These characteristics, the step-out phenomenon of motor can be judged according to the variation tendency of inverse electromotive force.
As shown in Fig. 2, when motor desynchronizing, inverse electromotive force no longer keeps rising or stable tendency is begun to decline, when T1
It carves motor and starts step-out, inverse electromotive force is begun to decline and downward trend continues for an extended period of time, and can be determined that motor with this
Step-out；If inverse electromotive force downward trend is smaller, and begins to ramp up trend at the T2 moment, then it is assumed that the fluctuation is tolerance interval
Interior step-out, does not determine motor desynchronizing, and a large amount of mathematics fortune will be present due to directly calculating inverse electromotive force according to Eq=Ce Ф n
It calculates, increases the complexity of algorithm, by being controlled using FOC, sample motor three-phase current passes through arriving for Clark, Park transformation
Id, Iq obtain Ud, Uq by PI control loop, and wherein q axis is quadrature axis, then quadrature axis inverse electromotive force Eq=Uq-R*Iq,
Middle Uq: quadrature-axis voltage, R: motor phase resistance, Iq: quadrature axis current, therefore the basis according to the formula as detection motor desynchronizing,
It is very necessary for detecting that motor loses cloth and makes corresponding safeguard measure in time.
Summary of the invention
The problem of for background technique, the present invention provides a kind of permanent magnet synchronous motor detection of loss of mains and protection sides
Method.
To achieve the above object, the invention provides the following technical scheme: a kind of permanent magnet synchronous motor detection of loss of mains and protection
Method, comprising the following steps:
S10: the real-time inverse electromotive force of motor is calculated according to formula Eq=Uq-R*Iq；
S20: judge the current motion state of motor, i.e. acceleration, deceleration or constant speed state；
S30: the maximum value of the motor inverse electromotive force is obtained according to current motor motion state；
S40: judge motor whether step-out；
S50: if judging result is that motor is out-of-step free, the motor is allowed to work on；If judging result is motor desynchronizing,
Stop motor work.
As a preferred technical solution of the present invention, in step S20, the tool of the acceleration or deceleration state of motor is judged
Body mode are as follows:
A, if current motor revolving speed is greater than or equal to the revolving speed of previous cycle, then it is assumed that the motor, which is in, to be accelerated or stablize
State records the maximum value of motor inverse electromotive force at this time；
B, if current motor revolving speed is less than the revolving speed of previous cycle, then it is assumed that the motor is in deceleration regime, by the electricity
The maximum value of the inverse electromotive force of machine is reset.
As a preferred technical solution of the present invention, in step S40, judge whether step-out is specifically divided into two kinds to motor
Situation:
A, the minimum value of inverse electromotive force when setting motor runs well is somebody's turn to do when inverse electromotive force continues for some time to be less than
When value, then motor desynchronizing is determined；
B, the fluctuation range for setting inverse electromotive force maximum value, is less than when the real-time inverse electromotive force of motor continues for some time
When the value, then motor desynchronizing is determined.
Compared with prior art, the beneficial effects of the present invention are: the present invention can inspection that is simple, being rapidly performed by motor desynchronizing
It surveys, avoids complicated mathematical operation, keep testing result more accurate reliable, can effectively prevent occurring in the motor course of work
The case where step-out, avoids the damage of motor.
Detailed description of the invention
Fig. 1 is motor inverse electromotive force and rotation speed relation schematic diagram；
Fig. 2 is that motor desynchronizing inverse electromotive force changes schematic diagram；
Fig. 3 is permanent magnet synchronous motor detection of loss of mains provided in an embodiment of the present invention and guard method step schematic diagram；
Fig. 4 is permanent magnet synchronous motor detection of loss of mains provided in an embodiment of the present invention and guard method flow diagram；
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 3 and Fig. 4, the present invention provides a kind of permanent magnet synchronous motor detection of loss of mains and guard method, including following
Step:
S10: the real-time inverse electromotive force of motor is calculated according to formula Eq=Uq-R*Iq；
S20: judge the current motion state of motor, i.e. acceleration, deceleration or constant speed state；
S30: the maximum value of the motor inverse electromotive force is obtained according to current motor motion state；
S40: judge motor whether step-out；
S50: if judging result is that motor is out-of-step free, the motor is allowed to work on；If judging result is motor desynchronizing,
Stop motor work.
In the specific implementation process, the concrete mode of the acceleration or deceleration state of motor is judged in step S20 are as follows:
A, if current motor revolving speed is greater than or equal to the revolving speed of previous cycle, then it is assumed that the motor, which is in, to be accelerated or stablize
State records the maximum value of motor inverse electromotive force at this time；
B, if current motor revolving speed is less than the revolving speed of previous cycle, then it is assumed that the motor is in deceleration regime, by the electricity
The maximum value of the inverse electromotive force of machine is reset.
In the specific implementation process, judge whether step-out is specifically divided into two kinds of situations to motor in step S40:
A, the minimum value of inverse electromotive force when setting motor runs well is somebody's turn to do when inverse electromotive force continues for some time to be less than
When value, then motor desynchronizing is determined；
B, the fluctuation range for setting inverse electromotive force maximum value, is less than when the real-time inverse electromotive force of motor continues for some time
When the value, then motor desynchronizing is determined.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (3)
1. a kind of permanent magnet synchronous motor detection of loss of mains and guard method, it is characterised in that the following steps are included:
S10: the real-time inverse electromotive force of motor is calculated according to formula Eq=Uq-R*Iq；
S20: judge the current motion state of motor, i.e. acceleration, deceleration or constant speed state；
S30: the maximum value of the motor inverse electromotive force is obtained according to current motor motion state；
S40: judge motor whether step-out；
S50: if judging result is that motor is out-of-step free, the motor is allowed to work on；If judging result is motor desynchronizing, stop
Motor work.
2. a kind of permanent magnet synchronous motor detection of loss of mains according to claim 1 and guard method, it is characterised in that: in step
In S20, the concrete mode of the acceleration or deceleration state of motor is judged are as follows:
A, if current motor revolving speed is greater than or equal to the revolving speed of previous cycle, then it is assumed that the motor, which is in, accelerates or stablize shape
State records the maximum value of motor inverse electromotive force at this time；
B, if current motor revolving speed is less than the revolving speed of previous cycle, then it is assumed that the motor is in deceleration regime, by the motor
The maximum value of inverse electromotive force is reset.
3. a kind of permanent magnet synchronous motor detection of loss of mains according to claim 1 and guard method, it is characterised in that: in step
In S40, judge whether step-out is specifically divided into two kinds of situations to motor:
A, the minimum value of inverse electromotive force when setting motor runs well, when inverse electromotive force is continued for some time less than the value
When, then determine motor desynchronizing；
B, the fluctuation range for setting inverse electromotive force maximum value, when the real-time inverse electromotive force of motor is continued for some time less than the value
When, then determine motor desynchronizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810746408.1A CN109039175B (en) | 2018-07-09 | 2018-07-09 | Method for detecting and protecting loss of synchronism of permanent magnet synchronous motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810746408.1A CN109039175B (en) | 2018-07-09 | 2018-07-09 | Method for detecting and protecting loss of synchronism of permanent magnet synchronous motor |
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| CN109039175A true CN109039175A (en) | 2018-12-18 |
| CN109039175B CN109039175B (en) | 2022-09-02 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110022099A (en) * | 2019-04-29 | 2019-07-16 | 青岛海信日立空调***有限公司 | A kind of detection method and device of permanent magnet synchronous motor step-out |
| CN110657551A (en) * | 2019-10-21 | 2020-01-07 | 宁波奥克斯电气股份有限公司 | Heavy load overload protection control method and device for air conditioning system and air conditioner |
| CN112737474A (en) * | 2019-10-29 | 2021-04-30 | 杭州先途电子有限公司 | Control method, control device and controller |
| CN113137395A (en) * | 2021-05-13 | 2021-07-20 | 中国工程物理研究院机械制造工艺研究所 | Acceleration control method of molecular pump |
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| CN102136820A (en) * | 2010-01-27 | 2011-07-27 | 建准电机工业股份有限公司 | Sensor-free start control method for brushless DC motor |
| US20120001584A1 (en) * | 2010-07-02 | 2012-01-05 | Minebea Co., Ltd. | Motor control device and out-of-step detecting method |
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| CN108111082A (en) * | 2017-11-16 | 2018-06-01 | 中冶南方（武汉）自动化有限公司 | The IF control stall detection methods and system of permanent magnet synchronous motor |
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| CN102136820A (en) * | 2010-01-27 | 2011-07-27 | 建准电机工业股份有限公司 | Sensor-free start control method for brushless DC motor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110022099A (en) * | 2019-04-29 | 2019-07-16 | 青岛海信日立空调***有限公司 | A kind of detection method and device of permanent magnet synchronous motor step-out |
| CN110657551A (en) * | 2019-10-21 | 2020-01-07 | 宁波奥克斯电气股份有限公司 | Heavy load overload protection control method and device for air conditioning system and air conditioner |
| CN112737474A (en) * | 2019-10-29 | 2021-04-30 | 杭州先途电子有限公司 | Control method, control device and controller |
| CN113137395A (en) * | 2021-05-13 | 2021-07-20 | 中国工程物理研究院机械制造工艺研究所 | Acceleration control method of molecular pump |
| CN113137395B (en) * | 2021-05-13 | 2022-09-27 | 中国工程物理研究院机械制造工艺研究所 | Acceleration control method of molecular pump |
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| CN109039175B (en) | 2022-09-02 |
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