CN106452199A - Three-phase induction motor star-delta starter and starting method thereof - Google Patents
Three-phase induction motor star-delta starter and starting method thereof Download PDFInfo
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- CN106452199A CN106452199A CN201610916227.XA CN201610916227A CN106452199A CN 106452199 A CN106452199 A CN 106452199A CN 201610916227 A CN201610916227 A CN 201610916227A CN 106452199 A CN106452199 A CN 106452199A
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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
- H02P1/32—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 star/delta switching
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- Control Of Ac Motors In General (AREA)
Abstract
The invention provides a three-phase induction motor star-delta starting control method and device. The device comprises a current and voltage detection unit, a single-chip microcomputer control unit, a human-computer interaction unit, a delta connection switching device based on a solid-state relay and an AC contactor, a star connection switching device based on the solid-state relay, a main circuit AC contactor and a thermal relay device. The current and voltage detection unit is connected on a bus and used for detecting power current and power voltage signals in real time so as to act as the basis of trigger control of the single-chip microcomputer control unit. The single-chip microcomputer control unit is connected with the current and voltage detection unit. The human-computer interaction unit is connected with the single-chip microcomputer control unit. Starting current of the starting instant of star connection can be effectively suppressed so that the current impact of star-delta switching can be reduced, the electromagnetic interference caused by disconnection of a stator winding in the star-to-delta process can also be reduced and thus noise and vibration of starting of an asynchronous motor can be greatly reduced.
Description
Technical field
The present invention relates to power electronics and power drives field, the star angle for concretely relating to three phase induction motor is risen
Dynamic method and control device.
Background technology
The larger three-phase cage asynchronous motor of capacity generally adopts reduced voltage starting mode, and reduced voltage starting method has：Star angle
Starting, stator winding string resistance decompression starting, autotransformer low-voltage starter and extend-triangle decompression starting etc..Star angle is reduced pressure
When starting refers to motor starting, stator winding is first connected into star, to reduce starting voltage, reduces starting current；Treat electronic
After machine is started, when rotating speed rising is close to rated speed, then stator winding is disconnected, and reconfiguration becomes triangular form, makes motor
Total head is run.In starting process, star-delta starter can make the starting current of motor be reduced to stator winding triangular form even
Connect 1/3rd of motor start starting current, simple structure, easy to operate, low price, it is adaptable to normal when running stator around
The occasion of the three-phase cage asynchronous motor during fractional load starting for triangular form connection is organized, therefore, star-delta starter is most commonly seen
Reduced voltage starting mode.
But in the handoff procedure of star to angle, as rotor windings have direct current free component, so reconfiguration becomes triangle
When type puts into electrical network again, instantaneous impulse stator current may be produced so that in the case of least favorable, the peak value of transient current surpasses
Cross the peak value of starting current.Meanwhile, during starting, induction conductivity belongs to strong inductive load, starts the moment in star, if put into
Very big surge current may be brought if out of season.In addition, overvoltage when asynchronous motor stator winding cut-offs
The current value in moment is cut-off depending on electromagnetic valve, is random as conventional AC catalyst cut-offs constantly, is therefore had two
Most extreme state is：Stator winding cut-offs the current value in moment when being zero, and the magnetic field energy of stator winding memory storage is also zero,
There is no electromagnetic interference；When stator winding cut-offs the current value in moment for peak value, the magnetic field energy of stator winding memory storage is most
Greatly, i.e. electromagnetic interference most serious.
Content of the invention
The present invention can effectively overcome tradition using star angle method for starting-controlling and the device of a kind of three phase induction motor
The starting method of star angle and the disadvantages mentioned above of launcher, are connect with exchanging using the stochastic pattern solid-state relay based on bidirectional thyristor
Tentaculum constitutes combination switch, carries out switching control by appropriate opportunity to combination switch, can effectively suppress star to pick up dynamic wink
Between starting current, reduce star angle switching when rush of current, can also reduce due to during star to angle stator winding disconnect
The electromagnetic interference brought by moment.In addition, the launcher has simple structure, low cost, easy to operate, safety protection function
Complete feature, noise when can substantially reduce asynchronous motor starting and vibration.
The present invention relates to a kind of induction conductivity star angle launcher based on stochastic pattern solid-state relay, including electric current with
Voltage detection unit, single chip control unit, man-machine interaction unit, the corner connection switching based on solid-state relay and A.C. contactor
Device, connect switching device, main circuit A.C. contactor and thermorelay device based on the star of solid-state relay, electric current and voltage inspection
Survey unit to be connected on bus for real-time detection source current and power supply voltage signal, as single chip control unit triggering control
Foundation；Single chip control unit is connected with voltage detection unit with electric current, by the analysis of detection signal, calculating, judge,
Realize the control that diametrical connection switching device, star connect switching device and main circuit A.C. contactor；Man-machine interaction unit and single-chip microcomputer
Control unit is connected, and realizes parameter of electric machine setting, start-stop control, status information display function；Corner connection switching device is by single-chip microcomputer
Control unit control triggering is simultaneously connected with controlled motor angle-style；Star connect switching device by single chip control unit control triggering with
The star-like connection of controlled motor；Main circuit A.C. contactor and thermorelay are connected between power supply and controlled motor and by monolithic
Machine control unit controls.
The electric current includes a current transformer with a voltage transformer and corresponding signal with voltage detection unit
Modulate circuit is constituted, for line current and the line voltage information of Real-time Collection motor.
The single chip control unit is by singlechip chip, A/D conversion chip, the drive circuit of solid-state relay, exchange
The drive circuit of catalyst is constituted with the drive circuit of touch screen；The drive circuit closure of singlechip chip control A.C. contactor
Or A.C. contactor is disconnected, control the drive circuit on or off solid-state relay of solid-state relay；A/D conversion chip is by electricity
The analog quantity that stream is detected with voltage detection unit is converted into the digital signal that monolithic can process and is input into singlechip chip；
Driving circuit realizes interacting for touch screen and single machine unit.
The man-machine interaction unit adopts touch screen, realizes parameter of electric machine setting, start-stop control, status information display work(
Energy.
The corner connection switching device is by three stochastic pattern solid-state relay SSR4-SSR6 with A.C. contactor KM2 and joint group
Become, realize the angle-style connection with three-phase stator winding.
The star connects switching device and is made up of three stochastic pattern solid-state relay SSR1-SSR3, realize with stator three-phase around
The wye connection of group.
The main circuit A.C. contactor and thermorelay device, by for realizing main circuit with motor stator winding
The A.C. contactor of connection is constituted with the overtemperature protection thermorelay for realizing threephase asynchronous.
According to the starting method of the induction conductivity star angle launcher based on stochastic pattern solid-state relay, its step is such as
Under：
Step one, the preparation before putting into operation
1) parameter of electric machine is set by human-computer interaction interface, the parameter of electric machine refers to rated power PN, rated speed nN, volume
Determine electric current IN, rated frequency fN, magnetic pole logarithm npWith torque capacity multiple αMT；
2) threephase asynchronous star connects no load test, empty load of motor, the A.C. contactor KM1 for connecing for star with for star
Connect is closed based on solid-state relay switching device SSR1, SSR2, SSR3, after motor stabilizing operation, single chip control unit
Real-time Collection stator winding A phase current i1AAnd line voltage uBC, its virtual value I is calculated respectively using discrete Fourier transform method1A0
With UBC, and ratio coefficient K of no-load current and line voltage is calculated using following formula；
K=I1A0/UBC(1)
3) using threephase asynchronous principle, specified electromagnetic torque T is calculatedN, maximum electromagnetic torque TMAnd breakdown slip
sM,
TM=aMTTN(3)
In formula, n0For synchronous rotational speed；sNFor rated slip；
4) intervalometer I for being used for solid-state relay SSR3, SSR1 time delay is respectively set as with the timing of intervalometer II
7.33ms with 32.33ms；
5) result of calculation is preserved, and sends halt instruction, and solid-state relay SSR1, SSR2, SSR3 first stop triggering and disconnecting,
Then A.C. contactor KM1 disconnects；
Step 2, assigns starting order by touch screen human-computer interaction interface, and single chip control unit first closes star and connects friendship
Stream catalyst KM1；
Step 3, the solid-state relay SSR2 that single chip control unit triggering control is connect for star, its main circuit closure；
Step 4, electric current detects line voltage u with voltage detection unitBC, when judging its zero crossing by single chip control unit
Intervalometer I and intervalometer II is started, as the solid-state relay SSR3 and SSR1 that timing is connect to triggering control for star, its master
Circuit is respectively closed, now the star-like starting operation of motor；
Step 5, after motor stabilizing operation, single chip control unit Real-time Collection stator winding A phase current i1AAnd line electricity
Pressure uBC, and conversion is calculated to the rotor current i of stator side using following formula2' instantaneous value
i2'=K uBC-i1A(7)
In formula, uBCFor BC line voltage, K is no-load current and the ratio coefficient of line voltage, sees formula (1)；
Step 6, by calculated rotor current instantaneous value i in step 52' calculated using discrete Fourier transform method
Convert virtual value I of stator side rotor current2′；
Step 7, meets electromagnetic torque T during stable operation using following formula calculating starY
In formula, INFor rated current；
Step 8, meets revolutional slip s during stable operation using following formula calculating star
Step 9, calculates, using following formula, the average revolutional slip that star is connected to corner connection process
sav=λ s (10)
λ in formula is modifying factor, and span is 1.05-1.2；
Step 10, meets the time interval Δ T for being disconnected to that corner connection puts into the electrical network moment using following formula calculating star
In formula, fNFor rated frequency；
Step 11, for the timing of the intervalometer III of star angle switching solid-state relay SSR4, SSR5, SSR6 time delay
It is set as (1000 Δ T-1) ms；
Step 12, single chip control unit sends stopping to solid-state relay SSR1, SSR2, the SSR3 for connecing for star and touches
Control instruction is sent out, described randomness solid-state relay SSR1, SSR2, SSR3 based on bidirectional thyristor treats each phase current zero crossing
When disconnect respectively automatically；
Step 13, starts intervalometer III by single chip control unit, when timing is arrived, to the switching for corner connection
Switched solid state relay SSR4, SSR5, SSR6 and A.C. contactor KM2 send control instruction respectively, solid-state relay SSR4,
SSR5, SSR6 are instantaneously closed, the machinery inertial timing closing of A.C. contactor KM2；
Step 14, after A.C. contactor KM2 closure, sends stopping triggering to solid-state relay SSR4, SSR5, SSR6
Control instruction, solid-state relay SSR4, SSR5, SSR6 disconnect, and threephase asynchronous star angle starting process terminates, normal corner connection
Operation.
The invention has the beneficial effects as follows：The induction conductivity star angle starting control based on solid-state relay that the present invention is provided
Method, when control device assigns starting order, first by solid-state relay each phase voltage maximum moment by stator three-phase around
Group is put into star and connects state, eliminates surge current when asynchronous motor is star-like to be started, then keeps star by common A.C. contactor
Operation being connect to steady statue, then star being disconnected by stochastic pattern solid-state relay in current zero-crossing point and connect state, it is fixed by motor to eliminate
There is, when disconnecting, the electromagnetic interference that magnetic field energy brings in sub- winding, then in stator winding induction electromotive force phase power phase place
Stator winding star is connect by another group of stochastic pattern solid-state relay and switches to triangular form connection by the consistent moment, eliminate due to rotor around
Group may produce instantaneous impulse stator current when there is direct current free component and causing to put into again electrical network, so as to inhibit star
Electric current and torque shock ends and electromagnetic interference in the starting process of angle.Random when then being replaced switching by common A.C. contactor
Type solid-state relay, to avoid that the thyristor in solid-state relay is very sensitive to voltage change ratio, overcurrent held
By indifferent, exist and puncture that hidden danger, security and stability are weaker, especially easily damage in the case that harmonic wave is slightly larger etc. and ask
Topic.While ensure that the simple structure of star angle launcher, with low cost and ease for operation.
Description of the drawings
Fig. 1 is the star angle start control system theory diagram of the present invention；
Fig. 2 is that the star angle of the present invention starts main circuit diagram；
Fig. 3 is the electric current of the present invention and voltage detection unit circuit block diagram；
Fig. 4 is the single chip control unit circuit block diagram of the present invention；
Fig. 5 is the preparation flow chart of the present invention；
Fig. 6 is that the star angle of the present invention starts main circuit diagram.
Specific embodiment
As depicted in figs. 1 and 2, the induction conductivity star angle based on stochastic pattern solid-state relay according to the present invention starts dress
Put, including electric current and voltage detection unit, single chip control unit, man-machine interaction unit, connect with exchanging based on solid-state relay
The corner connection switching device of tentaculum, connect based on the star of solid-state relay switching device, main circuit A.C. contactor and thermorelay dress
Put, electric current is connected on bus for real-time detection source current and power supply voltage signal, as single-chip microcomputer with voltage detection unit
The foundation of control unit triggering control；Single chip control unit is connected with voltage detection unit with electric current, by detection signal
Analysis, calculating, judge, realize the control that diametrical connection switching device, star connect switching device and main circuit A.C. contactor；Man-machine
Interactive unit is connected with single chip control unit, realizes parameter of electric machine setting, start-stop control, status information display function；Corner connection
Switching device is connected by single chip control unit control triggering and with controlled motor angle-style；Star connects switching device by single-chip microcomputer control
Unit control triggering processed and the star-like connection of controlled motor；Main circuit A.C. contactor and thermorelay are connected to power supply with controlled electricity
Between motivation and by single chip control unit control.
As shown in figure 3, the electric current and voltage detection unit include a current transformer and a voltage transformer and
Corresponding signal conditioning circuit is constituted, for line current and the line voltage information of Real-time Collection motor.
As shown in figure 4, the single chip control unit by singlechip chip, A/D conversion chip, solid-state relay driving
The drive circuit of circuit, the drive circuit of A.C. contactor and touch screen is constituted；Singlechip chip is any logical using more than 8
With chip, control the drive circuit closure of A.C. contactor or A.C. contactor is disconnected, control the drive circuit of solid-state relay
On or off solid-state relay；The analog quantity that electric current and voltage detection unit are detected is converted into monolithic by A/D conversion chip
The digital signal that can process simultaneously is input into singlechip chip；Driving circuit realizes the friendship of touch screen and single machine unit
Mutually.
As shown in Figure 5 and Figure 6, the man-machine interaction unit adopts touch screen, realize the parameter of electric machine arrange, start-stop control,
Status information display function.
The corner connection switching device is by three stochastic pattern solid-state relay SSR4-SSR6 with A.C. contactor KM2 and joint group
Become, realize the angle-style connection with three-phase stator winding.
The star connects switching device and is made up of three stochastic pattern solid-state relay SSR1-SSR3, realize with stator three-phase around
The wye connection of group.
The main circuit A.C. contactor and thermorelay device, by for realizing main circuit with motor stator winding
The A.C. contactor of connection is constituted with the overtemperature protection thermorelay for realizing threephase asynchronous.
According to the starting method of the induction conductivity star angle launcher based on stochastic pattern solid-state relay, its step is such as
Under：
Step one, the preparation before putting into operation
1) parameter of electric machine is set by human-computer interaction interface, the parameter of electric machine refers to rated power PN, rated speed nN, volume
Determine electric current IN, rated frequency fN, magnetic pole logarithm npWith torque capacity multiple αMT；
2) threephase asynchronous star connects no load test, empty load of motor, the A.C. contactor KM1 for connecing for star with for star
Connect is closed based on solid-state relay switching device SSR1, SSR2, SSR3, after motor stabilizing operation, single chip control unit
Real-time Collection stator winding A phase current i1AAnd line voltage uBC, its virtual value I is calculated respectively using discrete Fourier transform method1A0
With UBC, and ratio coefficient K of no-load current and line voltage is calculated using following formula；
K=I1A0/UBC(1)
3) using threephase asynchronous principle, specified electromagnetic torque T is calculatedN, maximum electromagnetic torque TMAnd breakdown slip
sM
TM=aMTTN(3)
In formula, n0For synchronous rotational speed；sNFor rated slip；
4) intervalometer I for being used for solid-state relay SSR3, SSR1 time delay is respectively set as with the timing of intervalometer II
7.33ms with 32.33ms；
5) result of calculation is preserved, and sends halt instruction, and solid-state relay SSR1, SSR2, SSR3 first stop triggering and disconnecting,
Then A.C. contactor KM1 disconnects；
Step 2, assigns starting order by touch screen human-computer interaction interface, and single chip control unit first closes star and connects friendship
Stream catalyst KM1；
Step 3, the solid-state relay SSR2 that single chip control unit triggering control is connect for star, its main circuit closure；
Step 4, electric current detects line voltage u with voltage detection unitBC, when judging its zero crossing by single chip control unit
Intervalometer I and intervalometer II is started, as the solid-state relay SSR3 and SSR1 that timing is connect to triggering control for star, its master
Circuit is respectively closed, now the star-like starting operation of motor；
Step 5, after motor stabilizing operation, single chip control unit Real-time Collection stator winding A phase current i1AAnd line electricity
Pressure uBC, and conversion is calculated to the rotor current i of stator side using following formula2' instantaneous value
i2'=K uBC-i1A(7)
In formula, uBCFor BC line voltage, K is no-load current and the ratio coefficient of line voltage, sees formula (1)；
Step 6, by calculated rotor current instantaneous value i in step 52' calculated using discrete Fourier transform method
Convert virtual value I of stator side rotor current2′；
Step 7, meets electromagnetic torque T during stable operation using following formula calculating starY
In formula, INFor rated current；
Step 8, meets revolutional slip s during stable operation using following formula calculating star
Step 9, calculates, using following formula, the average revolutional slip that star is connected to corner connection process
sav=λ s (10)
λ in formula is modifying factor, and span is 1.05-1.2；
Step 10, meets the time interval Δ T for being disconnected to that corner connection puts into the electrical network moment using following formula calculating star
In formula, fNFor rated frequency；
Step 11, for the timing of the intervalometer III of star angle switching solid-state relay SSR4, SSR5, SSR6 time delay
It is set as (1000 Δ T-1) ms；
Step 12, single chip control unit sends stopping to solid-state relay SSR1, SSR2, the SSR3 for connecing for star and touches
Control instruction is sent out, described randomness solid-state relay SSR1, SSR2, SSR3 based on bidirectional thyristor treats each phase current zero crossing
When disconnect respectively automatically；
Step 13, starts intervalometer III by single chip control unit, when timing is arrived, to the switching for corner connection
Switched solid state relay SSR4, SSR5, SSR6 and A.C. contactor KM2 send control instruction respectively, solid-state relay SSR4,
SSR5, SSR6 are instantaneously closed, the machinery inertial timing closing of A.C. contactor KM2；
Step 14, after A.C. contactor KM2 closure, sends stopping triggering to solid-state relay SSR4, SSR5, SSR6
Control instruction, solid-state relay SSR4, SSR5, SSR6 disconnect, and threephase asynchronous star angle starting process terminates, normal corner connection
Operation.
The specific embodiment of the present invention is these are only, the present invention is not limited to, for those skilled in the art
For member, the present invention can have various modifications and variations.All any modifications that within the spirit and principles in the present invention, is made,
Equivalent, improvement etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of induction conductivity star angle launcher based on stochastic pattern solid-state relay, including electric current and voltage detecting list
Unit, single chip control unit, man-machine interaction unit, based on the corner connection switching device of solid-state relay and A.C. contactor, be based on
The star of solid-state relay connects switching device, main circuit A.C. contactor and thermorelay device, and electric current is connect with voltage detection unit
Be used for real-time detection source current and power supply voltage signal on bus, the foundation of control is triggered as single chip control unit；
Single chip control unit is connected with voltage detection unit with electric current, by the analysis of detection signal, calculating, judge, it is right to realize
Corner connection switching device, star connect the control of switching device and main circuit A.C. contactor；Man-machine interaction unit and Single-chip Controlling list
Unit is connected, and realizes parameter of electric machine setting, start-stop control, status information display function；Corner connection switching device is by Single-chip Controlling list
Unit's control triggering is simultaneously connected with controlled motor angle-style；Star connects switching device by single chip control unit control triggering and controlled electricity
The star-like connection of machine；Main circuit A.C. contactor and thermorelay are connected between power supply and controlled motor and by Single-chip Controlling
Unit controls.
2. induction conductivity star angle launcher according to claim 1 based on stochastic pattern solid-state relay, is characterized in that：
The electric current includes a current transformer with a voltage transformer and corresponding signal conditioning circuit with voltage detection unit
Constitute, for line current and the line voltage information of Real-time Collection motor.
3. induction conductivity star angle launcher according to claim 1 based on stochastic pattern solid-state relay, is characterized in that：
The single chip control unit is by singlechip chip, A/D conversion chip, the drive circuit of solid-state relay, A.C. contactor
Drive circuit is constituted with the drive circuit of touch screen；The drive circuit closure of singlechip chip control A.C. contactor or disconnection are handed over
Stream catalyst, controls the drive circuit on or off solid-state relay of solid-state relay；A/D conversion chip is by electric current and voltage
The analog quantity that detector unit is detected is converted into the digital signal that monolithic can process and is input into singlechip chip；Touch screen drives
Dynamic circuit realiration touch screen is interacted with single machine unit.
4. induction conductivity star angle launcher according to claim 1 based on stochastic pattern solid-state relay, is characterized in that：
The man-machine interaction unit adopts touch screen, realizes parameter of electric machine setting, start-stop control, status information display function.
5. induction conductivity star angle launcher according to claim 1 based on stochastic pattern solid-state relay, is characterized in that：
The corner connection switching device is composed in parallel by three stochastic pattern solid-state relay SSR4-SSR6 and A.C. contactor KM2, is realized
Angle-style connection with three-phase stator winding.
6. induction conductivity star angle launcher according to claim 1 based on stochastic pattern solid-state relay, is characterized in that：
The star connects switching device and is made up of three stochastic pattern solid-state relay SSR1-SSR3, realizes star-like with three-phase stator winding
Connection.
7. induction conductivity star angle launcher according to claim 1 based on stochastic pattern solid-state relay, is characterized in that：
The main circuit A.C. contactor and thermorelay device, by for realizing the friendship that main circuit is connected with motor stator winding
Stream catalyst is constituted with the overtemperature protection thermorelay for realizing threephase asynchronous.
8., according to the starting method of the induction conductivity star angle launcher based on stochastic pattern solid-state relay, its step is as follows：
Step one, the preparation before putting into operation
1) parameter of electric machine is set by human-computer interaction interface, the parameter of electric machine refers to rated power PN, rated speed nN, specified electricity
Stream IN, rated frequency fN, magnetic pole logarithm npWith torque capacity multiple αMT；
2) threephase asynchronous star connects no load test, empty load of motor, the A.C. contactor KM1 that connects for star with connect for star
Closed based on solid-state relay switching device SSR1, SSR2, SSR3, after motor stabilizing operation, single chip control unit is real-time
Collection stator winding A phase current i1AAnd line voltage uBC, its virtual value I is calculated respectively using discrete Fourier transform method1A0With UBC,
And using following formula calculating no-load current and ratio coefficient K of line voltage；
K=I1A0/UBC(1)
3) using threephase asynchronous principle, specified electromagnetic torque T is calculatedN, maximum electromagnetic torque TMAnd breakdown slip sM,
TM=aMTTN(3)
In formula, n0For synchronous rotational speed；sNFor rated slip；
4) intervalometer I for being used for solid-state relay SSR3, SSR1 time delay is respectively set as with the timing of intervalometer II
7.33ms with 32.33ms；
5) result of calculation is preserved, and sends halt instruction, and solid-state relay SSR1, SSR2, SSR3 first stop triggering and disconnecting, then
A.C. contactor KM1 disconnects；
Step 2, assigns starting order by touch screen human-computer interaction interface, and single chip control unit first closes star and connects exchange and connects
Tentaculum KM1；
Step 3, the solid-state relay SSR2 that single chip control unit triggering control is connect for star, its main circuit closure；
Step 4, electric current detects line voltage u with voltage detection unitBC, start when judging its zero crossing by single chip control unit
Intervalometer I and intervalometer II, when the solid-state relay SSR3 and SSR1 that timing is connect to triggering control for star, its main circuit
It is respectively closed, now the star-like starting operation of motor；
Step 5, after motor stabilizing operation, single chip control unit Real-time Collection stator winding A phase current i1AAnd line voltage
uBC, and conversion is calculated to the rotor current i of stator side using following formula2' instantaneous value
i2'=K uBC-i1A(7)
In formula, uBCFor BC line voltage, K is no-load current and the ratio coefficient of line voltage, sees formula (1)；
Step 6, by calculated rotor current instantaneous value i in step 52' arrived using the calculating conversion of discrete Fourier transform method
Virtual value I of stator side rotor current2′；
Step 7, meets electromagnetic torque T during stable operation using following formula calculating starY
In formula, INFor rated current；
Step 8, meets revolutional slip s during stable operation using following formula calculating star
Step 9, calculates, using following formula, the average revolutional slip that star is connected to corner connection process
sav=λ s (10)
λ in formula is modifying factor, and span is 1.05-1.2；
Step 10, meets the time interval Δ T for being disconnected to that corner connection puts into the electrical network moment using following formula calculating star
In formula, fNFor rated frequency；
Step 11, sets for the timing of the intervalometer III of star angle switching solid-state relay SSR4, SSR5, SSR6 time delay
For (1000 Δ T-1) ms；
Step 12, single chip control unit sends stopping triggering control to solid-state relay SSR1, SSR2, the SSR3 for connecing for star
System instruction, described randomness solid-state relay SSR1, SSR2, SSR3 based on bidirectional thyristor treats each phase current zero crossing time-division
Not not automatically, disconnect；
Step 13, starts intervalometer III by single chip control unit, when timing is arrived, to the fling-cut switch for corner connection
Solid-state relay SSR4, SSR5, SSR6 and A.C. contactor KM2 send control instruction respectively, solid-state relay SSR4, SSR5,
SSR6 is instantaneously closed, the machinery inertial timing closing of A.C. contactor KM2；
Step 14, after A.C. contactor KM2 closure, sends stopping triggering control to solid-state relay SSR4, SSR5, SSR6
Instruction, solid-state relay SSR4, SSR5, SSR6 disconnect, and threephase asynchronous star angle starting process terminates, normal corner connection fortune
OK.
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Effective date of registration: 20200703 Address after: 121000 Jinzhou Province Economic Zone, large road, No. 18, No. Patentee after: Linghai Kecheng Electric Co.,Ltd. Address before: 121000 No. 19, science Road, Songshan New District, Liaoning, Jinzhou Patentee before: BOHAI University |
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