CN107659212A - The soft start control method of asynchronous machine - Google Patents
The soft start control method of asynchronous machine Download PDFInfo
- Publication number
- CN107659212A CN107659212A CN201711113420.0A CN201711113420A CN107659212A CN 107659212 A CN107659212 A CN 107659212A CN 201711113420 A CN201711113420 A CN 201711113420A CN 107659212 A CN107659212 A CN 107659212A
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- China
- Prior art keywords
- asynchronous machine
- control method
- soft start
- start control
- angle
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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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
- H02P1/28—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor by progressive increase of voltage applied to primary circuit of motor
Abstract
The present invention relates to a kind of soft start control method of asynchronous machine, it is characterised in that wherein, the load torque of the asynchronous machine and the relation of rotor speed meet that, when the Induction Motor-Driven loads, the power-factor angle of the asynchronous machine does not change；Including：Obtain the power-factor angle of the asynchronous machine；According to the power-factor angle, Trigger Angle adjustment amount Δ α is obtained；Obtain initial trigger angle α set in advance trigger rule；Calculate final Trigger Angle α ' trigger rule.The soft start control method of above-mentioned asynchronous machine, for the special relationship of the load torque and rotor speed of asynchronous machine, power-factor angle is constant, and the application need not monitor the change of power-factor angle, so also avoiding the need for the Trigger Angle of amendment IGCT in real time, only need once to correct, the soft start control method of asynchronous machine is optimized, omits the detection to power-factor angle, so as to omit related hardware, hardware is simplified, and reduces cost.
Description
Technical field
The present invention relates to asynchronous machine, more particularly to the soft start control method of asynchronous machine.
Background technology
Soft starter is a kind of motor control dress for integrating soft start, soft stop, light-load energy saving and multifunction protection
Standby, its main composition is three bidirectional triode thyristors and its electronic control circuit being serially connected between power supply and controlled motor.It is logical
The angle of flow of three bidirectional triode thyristors of control is crossed, makes the output voltage of bidirectional triode thyristor gradually increase, motor ramps up, directly
Turned on entirely to bidirectional triode thyristor, electric motor operation realizes smooth starting in the mechanical property of rated voltage, reduces and starts electricity
Stream, avoid starting overcurrent tripping.When motor reaches rated revolution, starting process terminates, and soft starter exports a switch letter
Number be used for control bypass contactor, for motor normal operation rated voltage is provided.
Following technical problem be present in conventional art：
It is most common i.e. (also known as soft using starter in order to avoid impact during startup in existing Firefighting Pump Control
Starter) technology, it is but existing more complicated using the startup control method of soft initiator, so as to cause corresponding hardware
Structure is more complicated, cost increase.
The content of the invention
Based on this, it is necessary to for above-mentioned technical problem, there is provided a kind of soft start control method of asynchronous machine,
A kind of soft start control method of asynchronous machine, wherein, the load torque of the asynchronous machine and rotor speed
Relation meets that, when the Induction Motor-Driven loads, the power-factor angle of the asynchronous machine does not change；Including：
Obtain the power-factor angle of the asynchronous machine；
According to the power-factor angle, Trigger Angle adjustment amount Δ α is obtained；
Obtain initial trigger angle α set in advance trigger rule；
Calculate final Trigger Angle α ' trigger rule；
Voltage signal from three phase supply power supply forms each six pulses of voltage cycle after synchronous signal circuit
Three-phase voltage synchronizing pulse train, the clock reference as triggering；
Thyristor circuit is triggered according to final Trigger Angle α ' trigger rule, controls the end electricity of the asynchronous machine
Pressure.
The soft start control method of above-mentioned asynchronous machine, the special pass of load torque and rotor speed for asynchronous machine
System, optimizes to the soft start control method of asynchronous machine, omits the detection to power-factor angle, related hard so as to omit
Part, hardware are simplified, and reduce cost.
It is described final in the step " trigger rule for calculating final Trigger Angle α ' " in other one embodiment
Trigger Angle α '=initial trigger angle α adds the Trigger Angle adjustment amount Δ α.
In other one embodiment, load torque and the rotor speed of the asynchronous machine meet following formula,
Tload=KNβ, wherein, TloadIt is load torque, N is rotor speed, and β is that 2, K is positive number.
In other one embodiment, the impeller of Induction Motor-Driven one, the working media of the impeller is fluid.
In other one embodiment, in step, " thyristor circuit is carried out according to final Trigger Angle α ' trigger rule
Triggering, control the terminal voltage of the asynchronous machine " in, the terminal voltage of the asynchronous machine rapid increase in the first preset time
To the first predeterminated voltage, then it is gradually increasing in the second preset time, the asynchronous machine is continuous with the rising of terminal voltage
Acceleration reaches amount voltage and rated speed.
In other one embodiment, first preset time is 1 second.
In other one embodiment, second preset time is 1 to 60 seconds.
In other one embodiment, first predeterminated voltage is 0.3 times of the rated voltage of the asynchronous machine
To 0.5 times.
In other one embodiment, the asynchronous machine is used for fire pump.
In other one embodiment, the frequency of the pulse is 300 hertz.
Brief description of the drawings
Fig. 1 is a kind of power-factor angle closed loop of the closed-loop control of the soft start control for asynchronous machine that prior art provides
The theory diagram of control.
Fig. 2 is a kind of flow chart of the soft start control method for asynchronous machine that the embodiment of the present application provides.
Fig. 3 is a kind of power-factor angle of the closed-loop control of the soft start control for asynchronous machine that the embodiment of the present application provides
The theory diagram of closed-loop control.
Fig. 4 is that a kind of mechanical property of the asynchronous machine of the embodiment of the present application offer in the case of different terminal voltages is bent
Line chart.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Refering to the flow chart for the soft start control method that Fig. 2 is a kind of asynchronous machine that the embodiment of the present application provides.
A kind of soft start control method of asynchronous machine, wherein, the load torque of the asynchronous machine and rotor speed
Relation meets that, when the Induction Motor-Driven loads, the power-factor angle of the asynchronous machine does not change；Including：
S110, the power-factor angle for obtaining the asynchronous machine.
S120, according to the power-factor angle, obtain Trigger Angle adjustment amount Δ α.
S130, the trigger rule for obtaining initial trigger angle α set in advance.
S140, the trigger rule for calculating final Trigger Angle α '.
S150, the voltage signal from three phase supply power supply form each voltage cycle six after synchronous signal circuit
The three-phase voltage synchronizing pulse train of individual pulse, the clock reference as triggering.
S160, thyristor circuit are triggered according to final Trigger Angle α ' trigger rule, control the asynchronous machine
Terminal voltage.
The soft start control method of above-mentioned asynchronous machine, the special pass of load torque and rotor speed for asynchronous machine
System, power-factor angle is constant, compares Fig. 1 and Fig. 3 and understands that the application need not monitor the change of power-factor angle, so
Also the Trigger Angle of amendment IGCT in real time is avoided the need for, it is only necessary to once correct, to the soft start controlling party of asynchronous machine
Method is optimized, and omits the detection to power-factor angle, and so as to omit related hardware, hardware is simplified, and reduces cost.
It is described final in the step " trigger rule for calculating final Trigger Angle α ' " in other one embodiment
Trigger Angle α '=initial trigger angle α adds the Trigger Angle adjustment amount Δ α.
In other one embodiment, load torque and the rotor speed of the asynchronous machine meet following formula,
Tload=KNβ, wherein, TloadIt is load torque, N is rotor speed, and β is that 2, K is positive number.
For fluid machineries such as fan, ventilation blower, air blower, water pump, oil pumps, with the rotation of impeller, working media is played such as
Square proportional change, i.e. TL=to the resistance of blade in certain range of speeds substantially to rotating speed n such as empty gas and water, oil
kn2, such load is referred to as a square drop torque load(ing), that is, α is 2 situation.
Mechanical property of a kind of asynchronous machine in the case of different terminal voltages provided refering to Fig. 4 the embodiment of the present application
Curve map.
(it can be calculated and got by below equation on the mechanical characteristic figure：
According to the relation of motor torque and rotating speed, show that motor torque is directly proportional to the quadratic power of electric moter voltage.
Wherein TeFor motor torque, U1 is motor terminal voltage,
R1：Motor stator resistance, X1σMotor stator leakage inductance,
Rotor equivalent resistance, X2σThe equivalent leakage inductance of rotor)
As can be seen that the quadratic power direct proportionality of motor torque and rotating speed, load torque is also with the quadratic power of rotating speed
Direct proportionality, when understanding that the Induction Motor-Driven quadratic power loads by certain derivation, the work(of the asynchronous machine
Rate factor angle does not change.
In other one embodiment, the impeller of Induction Motor-Driven one, the working media of the impeller is fluid.
Fluid can be gas and liquid.
In other one embodiment, in step, " thyristor circuit is carried out according to final Trigger Angle α ' trigger rule
Triggering, control the terminal voltage of the asynchronous machine " in, the terminal voltage of the asynchronous machine rapid increase in the first preset time
To the first predeterminated voltage, then it is gradually increasing in the second preset time, the asynchronous machine is continuous with the rising of terminal voltage
Acceleration reaches amount voltage and rated speed.
In other one embodiment, first preset time is 1 second.
In other one embodiment, second preset time is 1 to 60 seconds.
In other one embodiment, first predeterminated voltage is 0.3 times of the rated voltage of the asynchronous machine
To 0.5 times.
In other one embodiment, the asynchronous machine is used for fire pump.
In other one embodiment, the frequency of the pulse is 300 hertz.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of soft start control method of asynchronous machine, it is characterised in that wherein, the load torque of the asynchronous machine is with turning
The relation of rotor speed meets that, when the Induction Motor-Driven loads, the power-factor angle of the asynchronous machine does not change；Bag
Include：
Obtain the power-factor angle of the asynchronous machine；
According to the power-factor angle, the Trigger Angle adjustment amount Δ α is obtained；
Obtain initial trigger angle α set in advance trigger rule；
Calculate final Trigger Angle α ' trigger rule；
Voltage signal from three phase supply power supply forms the three of each six pulses of voltage cycle after synchronous signal circuit
Phase voltage synchronizing pulse train, the clock reference as triggering；
Thyristor circuit is triggered according to final Trigger Angle α ' trigger rule, controls the terminal voltage of the asynchronous machine.
2. the soft start control method of asynchronous machine according to claim 1, it is characterised in that the step " calculates most
In whole Trigger Angle α ' trigger rule ", final Trigger Angle the α '=initial trigger angle α adds the Trigger Angle adjustment amount Δ α.
3. the soft start control method of asynchronous machine according to claim 1, it is characterised in that the asynchronous machine is born
Set torque meets following formula, T with rotor speedload=KNβ, wherein, TloadIt is load torque, N is rotor speed, and β is 2,
K is positive number.
4. the soft start control method of asynchronous machine according to claim 3, it is characterised in that the Induction Motor-Driven
One impeller, the working media of the impeller is fluid.
5. the soft start control method of asynchronous machine according to claim 1, it is characterised in that in step " IGCT electricity
Road is triggered according to final Trigger Angle α ' trigger rule, controls the terminal voltage of the asynchronous machine " in, the asynchronous machine
Terminal voltage the first predeterminated voltage is climbed in the first preset time, be then gradually increasing in the second preset time,
The asynchronous machine constantly accelerates to reach amount voltage and rated speed with the rising of terminal voltage.
6. the soft start control method of asynchronous machine according to claim 5, it is characterised in that first preset time
For 1 second.
7. the soft start control method of asynchronous machine according to claim 5, it is characterised in that second preset time
For 1 to 60 seconds.
8. the soft start control method of asynchronous machine according to claim 5, it is characterised in that first predeterminated voltage
For 0.3 times to 0.5 times of the rated voltage of the asynchronous machine.
9. the soft start control method of asynchronous machine according to claim 1, it is characterised in that the asynchronous machine is used for
Fire pump.
10. the soft start control method of asynchronous machine according to claim 1, it is characterised in that the frequency of the pulse
It is 300 hertz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711113420.0A CN107659212A (en) | 2017-11-13 | 2017-11-13 | The soft start control method of asynchronous machine |
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| CN201711113420.0A CN107659212A (en) | 2017-11-13 | 2017-11-13 | The soft start control method of asynchronous machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109713943A (en) * | 2019-03-12 | 2019-05-03 | 浙江汇迅骏机电技术有限公司 | A kind of time variant voltage electric motor starting method |
| CN115441772A (en) * | 2022-11-07 | 2022-12-06 | 希望森兰科技股份有限公司 | Triggering angle control method for soft starter of asynchronous motor |
Citations (5)
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|---|---|---|---|---|
| US4291264A (en) * | 1979-09-04 | 1981-09-22 | Borg-Warner Corporation | Power factor control system for inverter-driven a-c induction motor |
| CN101626215A (en) * | 2009-05-27 | 2010-01-13 | 株洲变流技术国家工程研究中心有限公司 | Soft start and local compensation method of asynchronous electric motor and device thereof |
| CN101662247A (en) * | 2009-09-25 | 2010-03-03 | 中国北车集团大连机车车辆有限公司 | Current-limiting soft-starting method of asynchronous motor under wideband power supply |
| CN102655385A (en) * | 2012-01-05 | 2012-09-05 | 三一重型装备有限公司 | Soft starter of three-phase asynchronous motor and control method of soft starter |
| CN105515452A (en) * | 2014-09-24 | 2016-04-20 | 褚秀清 | Electronic soft starter based on AT90S8535 single chip microcomputer |
-
2017
- 2017-11-13 CN CN201711113420.0A patent/CN107659212A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4291264A (en) * | 1979-09-04 | 1981-09-22 | Borg-Warner Corporation | Power factor control system for inverter-driven a-c induction motor |
| CN101626215A (en) * | 2009-05-27 | 2010-01-13 | 株洲变流技术国家工程研究中心有限公司 | Soft start and local compensation method of asynchronous electric motor and device thereof |
| CN101662247A (en) * | 2009-09-25 | 2010-03-03 | 中国北车集团大连机车车辆有限公司 | Current-limiting soft-starting method of asynchronous motor under wideband power supply |
| CN102655385A (en) * | 2012-01-05 | 2012-09-05 | 三一重型装备有限公司 | Soft starter of three-phase asynchronous motor and control method of soft starter |
| CN105515452A (en) * | 2014-09-24 | 2016-04-20 | 褚秀清 | Electronic soft starter based on AT90S8535 single chip microcomputer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109713943A (en) * | 2019-03-12 | 2019-05-03 | 浙江汇迅骏机电技术有限公司 | A kind of time variant voltage electric motor starting method |
| CN115441772A (en) * | 2022-11-07 | 2022-12-06 | 希望森兰科技股份有限公司 | Triggering angle control method for soft starter of asynchronous motor |
| CN115441772B (en) * | 2022-11-07 | 2023-02-07 | 希望森兰科技股份有限公司 | Triggering angle control method for soft starter of asynchronous motor |
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Application publication date: 20180202 |