CN205829504U - A kind of asynchronous machine grading variable-frequency soft starting device - Google Patents
A kind of asynchronous machine grading variable-frequency soft starting device Download PDFInfo
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- CN205829504U CN205829504U CN201620651885.6U CN201620651885U CN205829504U CN 205829504 U CN205829504 U CN 205829504U CN 201620651885 U CN201620651885 U CN 201620651885U CN 205829504 U CN205829504 U CN 205829504U
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- asynchronous machine
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- soft starting
- starting device
- frequency soft
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Abstract
A kind of asynchronous machine grading variable-frequency soft starting device disclosed in this utility model, it includes control unit, the synchronizing voltage detector unit that is connected with control unit with data wire respectively, drive circuit, current detecting unit, speed detection unit, and be connected with speed detection unit asynchronous machine, the thyristor groups being connected with drive circuit, the Bypass control unit that is connected with thyristor groups.This utility model is compared with traditional startup device, owing to classification converter technique is used on asynchronous machine grading variable-frequency soft starting, therefore can effectively reduce the starting current of motor and increase the starting torque of motor, it is achieved heavy-load start, and there are startup and two kinds of functions of braking.
Description
Technical field
This utility model relates to frequency dividing and becomes level and asynchronous machine Start Technology, specifically a kind of asynchronous machine classification frequency conversion
Soft starter device.
Background technology
Cage induction motor has the advantages such as simple in construction, reliable, maintenance is easy, it is thus achieved that uses widely, starts
Process study particularly heavy-load start is by most attention.The asynchronous machine electric current when across-the-line starting can reach rated current
4～7 times, motor and electrical network are all caused the biggest impact by excessive starting current.Traditional motor soft starter is all logical
Cross reduce motor stator terminal voltage to reduce starting current, but blood pressure lowering current limliting can be substantially reduced the starting torque of motor, makes
The starting process of motor is elongated, it is also possible to starting failure during band heavy duty.
Occasion in motor belt motor underloading He some low capacities typically can use traditional reduced voltage starting, the asynchronous electricity of squirrel-cage
Machine can utilize autotransformer to carry out reduced voltage starting；For time properly functioning be the motor of delta connection can utilize star-
Delta control, is reduced to the 1/3 of triangle starting by electric current；Can also start time on stator winding series resistance or electricity
Anti-starting, utilizes series resistance or reactance, reaches the purpose of dividing potential drop, reduces starting current.The starting of the asynchronous machine of Wound-rotor type
Better performances, but expensive.String resistance in the rotor loop of wire-wound asynchronous motor, can reduce motor plays galvanic electricity
Stream, can increase the starting torque of motor simultaneously, need excision resistance step by step, operate complex in starting process, and
There is the impact of torque.Asynchronous machine is applied to each corner industrial widely, is required for asynchronous electricity in a lot of occasions
The frequent start-stop of machine, when asynchronous machine across-the-line starting, can produce the biggest starting current, all causes the biggest to motor and electrical network
Impact, the research of In Asynchronous Motor Soft Starter just seems particularly significant.
Summary of the invention
Technical problem to be solved in the utility model is: typically all pass through for traditional In Asynchronous Motor Soft Starter
Reduced voltage starting reduces starting current, and due to the reduction of electric current, starting torque can reduce more severe, when usually can cause starting
Between long, in the startings occasion problem that also results in starting failure of heavy duty, it is provided that a kind of asynchronous machine grading variable-frequency soft starting fills
Putting, classification converter technique can be used on soft starter by this device, can effectively reduce electricity when starting asynchronous motor
The starting current of machine and the starting torque of increase motor, and there are startup and two kinds of functions of braking.
This utility model solves its technical problem and the technical scheme is that and include control unit, respectively with data wire with
Synchronizing voltage detector unit that control unit is connected, drive circuit, current detecting unit, speed detection unit, and and speed
The asynchronous machine that detector unit is connected, the thyristor groups being connected with drive circuit, the Bypass control unit that is connected with thyristor groups.
Described synchronizing voltage detector unit, can by the transformator being sequentially connected with the signal of telecommunication, band filter,
LM339 voltage comparator, two-way differential comparator form.
Described drive circuit, can be made up of two audions and a pulse transformer, one of them audion with
The input of pulse transformer is connected, and another audion is connected with the outfan of pulse transformer.
Described current detecting unit, can be by the current sensor being sequentially connected with the signal of telecommunication, three phase full bridge rectified current
Road, LM339 voltage follower composition.
Described speed detection unit, can be made up of a speed detection sensor.
Described control unit, can use TMS320F28335DSP is master controller.
Described Bypass control unit, can be old by the optical coupling isolator TLP521 being sequentially connected with the signal of telecommunication, Darlington
Line-column reverse driven MC1413, relay, catalyst form.
Described thyristor groups, can be made up of three pairs of IGCTs, and its inverse parallel is fixed with the three-phase of asynchronous machine after connecting
Son is connected in series.
This utility model compared with prior art has a following main advantage:
1. by the Technology application of classification frequency conversion to the soft start of motor.Classification converter technique is the starting process at motor
In provide voltage by the select positive half-wave of power supply or the negative half-wave of rule to the stator of motor, by the frequency level of voltage from
Little to big rising, and frequency is to divide according to first-harmonic integral multiple, thus realize there is a grade variable voltage variable frequency, electricity can reduced
The starting torque of motor is improved, it is achieved heavy-load start in the case of dynamo-electric stream.
2. there are startup and two kinds of functions of braking.
Voltage experiments waveform according to control strategy is as shown in Figure 5-Figure 8, it can be seen that system can be the most right
Supply voltage carries out two divided-frequency, three frequency division, four frequency dividings, seven frequency dividings.
Powering dividing every time to motor respectively, the electric current obtained is as shown in Fig. 9-Figure 12, it can be seen that the waveform of electric current
Frequency consistent with voltage, the alternate of electric current is changed according to the frequency of voltage.
Each frequency dividing is powered to motor according to 7-4-3-2-1, it can be seen that the virtual value of electric current significantly reduces,
When frequency is 3-2-1, the amplitude of electric current the most substantially diminishes, and shows from result shown in Figure 13: grading variable-frequency soft starting can be obvious
The electric current of starting reducing motor.
Accompanying drawing explanation
Fig. 1 is population structure schematic diagram of the present utility model.
Fig. 2 is synchronization signal detection circuit figure of the present utility model.
Fig. 3 is current detection circuit figure of the present utility model.
Fig. 4 is bypass control circuit figure of the present utility model.
Fig. 5 is two divided-frequency voltage oscillogram.
Fig. 6 is three frequency division voltage oscillogram.
Fig. 7 is four frequency dividing voltage oscillograms.
Fig. 8 is seven frequency dividing voltage oscillograms.
Fig. 9 is two divided-frequency current waveform figure.
Figure 10 is three frequency division current waveform figure.
Figure 11 is four frequency dividing current waveform figures.
Figure 12 is seven frequency dividing current waveform figures.
Figure 13 is the three-phase current waveform of grading variable-frequency soft starting.
Detailed description of the invention
This utility model provides a kind of asynchronous machine grading variable-frequency soft starting device, including major loop, drive circuit and
Control loop, wherein: major loop is made up of thyristor groups and Bypass control unit, real by controlling the turn-on and turn-off of IGCT
Now hand over classification frequency conversion, after soft start completes, connect Bypass control unit, make asynchronous machine work under power frequency；Controlling back
Road and drive circuit include synchronizing voltage detection, current detecting, thyristor gating circuit etc..When starting asynchronous motor,
This device can effectively reduce asynchronous machine starting current and increase asynchronous machine starting torque, and have startup and
Brake two kinds of functions.
Below in conjunction with embodiment and accompanying drawing, this utility model is described in further detail.
This utility model provides a kind of asynchronous machine grading variable-frequency soft starting device, in order to make it easier to safeguard, has
Expandability, reconfigurability and operability, can use blocking method, concrete structure such as Fig. 1 in its exploitation design process
To shown in Fig. 4, including synchronizing voltage detector unit, drive circuit, current detecting unit, speed detection unit, control unit, side
Road control unit, thyristor groups, asynchronous machine, wherein: the outfan of synchronizing voltage detector unit, be connected with control unit；Drive
The input on galvanic electricity road, is connected with control unit；The outfan of current detecting unit, is connected with control unit；Velocity measuring list
The outfan of unit, is connected with control unit；Bypass control unit is connected to thyristor groups two ends；The input of speed detection unit
End, is connected with asynchronous machine；The input of thyristor groups, is connected with drive circuit.
Described synchronizing voltage detector unit, physical circuit as shown in Figure 2: be used for detecting synchronizing signal, it delivered to
In the middle fracture of TMS320F28335DSP, in the moment that record interrupts each time, trigger the fiducial time of pulse as output, make
IGCT when triggering is all on the basis of the synchronizing signal of power supply.This synchronizing voltage detector unit is by 220V/5V transformation
Device, band filter, voltage comparator LM339 and two-way differential comparator LM393 composition, wherein: 220V/5V transformator
Outfan is connected with the input of band filter；The input phase of the outfan of band filter and voltage comparator LM339
Even；The outfan of voltage comparator LM339 is connected with the input of two-way differential comparator LM393.
The work process of this synchronizing voltage detector unit is: synchronizing signal is to be converted by the transformator of 220V/5V to obtain, so
After synchronizing signal V-IN is sent into the second-order bandpass filter that is made up of LM324, eliminate interference signal.By filtering interference signals warp
Cross a voltage follower to be connected to the in-phase input end of voltage comparator LM339 and carry out Zero-cross comparator, such voltage comparator
LM393 output is exactly rectangular pulse.
Described drive circuit, realizes stepless soft start for triggering IGCT timely, the most reliable.This drive circuit
It is made up of, wherein two audions and a pulse transformer: an audion is connected with the input of pulse transformer；Another
Individual audion is connected with the outfan of pulse transformer.
The work process of this drive circuit is: produced one group of negative pulse by the six of TMS320F28335DSP PWM mouths,
Making triode ON, triode ON rear drive pulse transformer, pulse transformer exports certain pulsed power signal to brilliant
The gate pole of brake tube, when the voltage at now IGCT two ends is timing, and IGCT will turn on.
Described current detecting unit, physical circuit is as it is shown on figure 3, be used for overcurrent protection and the current-limiting protection of motor.Should
Current detecting unit is made up of, wherein current sensor, voltage follower LM324 and three-phase bridge rectification circuit: electric current passes
The outfan of sensor is connected with the input of three-phase bridge rectification circuit；The outfan of three-phase bridge rectification circuit and voltage follow
The input of device LM324 is connected.
The work process of this current detecting unit is: the electric current recorded by current sensor, through three phase full bridge circuit
Rectification and filtering, the dividing potential drop carrying out resistance obtains a voltage signal being directly proportional with electric current.By voltage signal through overvoltage with
With device, the signal obtained is sent in the sheet of DSP in A/D converter, after A/D converter processes, can be obtained by electric current letter
Number, the current feedback signal in starting process.
Described speed detection unit, detection to motor speed in device works.This speed detection unit is by one
Individual speed detection sensor forms.
Described control unit, selection TMS320F28335DSP is master controller, is used for controlling unit, by outside
The analogue signal detected is converted into digital signal, then this digital signal is converted to analog signal output such that it is able to real
The several functions that existing motor needs in controlling, and can communicate with other asynchronous peripheral circuit.
Described Bypass control unit, physical circuit as shown in Figure 4, for after soft start completes, makes soft starter move back
Go out among the operation of motor, during allowing soft starter only be operated in soft and soft stop, improve the service efficiency of soft starter.
This Bypass control unit is by optical coupling isolator TLP521, Darlington display reverse driven MC1413, relay and catalyst
Composition, wherein: the outfan of optical coupling isolator TLP521 is connected with the input of Darlington display reverse driven MC1413；Reach
The outfan of Islington display reverse driven MC1413 is connected with the input of relay；The outfan of relay and catalyst
Input is connected.
The work process of this Bypass control unit is: the low level signal exported by DSP drives audion, optical coupling isolator
TLP521 turns on, and TLP521 is completely isolated carry out electrically by input and output signal, is then passed through reverse driven
MC1413 drives relay, and last relay just can drive catalyst.
Described thyristor groups, is made up of three pairs of IGCTs, be grading variable-frequency soft starting mainly comprise circuit, can use
Three pairs of IGCT inverse parallels being connected, then the threephase stator with asynchronous machine is connected in series.
The asynchronous machine grading variable-frequency soft starting device that above-described embodiment provides, its work process is as follows:
After asynchronous machine grading variable-frequency soft starting device accesses in electrical network, synchronous signal detection unit records line voltage
Zero crossing, after the zero crossing of signal being detected, on the basis of zero cross signal, according to classification converter technique, carry out Pyatyi frequency dividing
Starting, the triggering signal exported by control unit drives thyristor groups through thyristor driving circuit；In starting process,
By detecting the speed of motor, when reaching the speed that every one-level sets, carry out the switching between frequency.Braking procedure at motor
In, take tri-grades of frequencies of 1-2-4 to complete the braking of motor, its braking procedure is contrary with starting process, by reducing motor
Synchronous rotational speed increases the braking moment of motor.Last after soft start completes, soft starter just should exit the operation of motor
Among, by bypass contactor, soft starter is withdrawn from three phase mains and motor side.
Claims (8)
1. an asynchronous machine grading variable-frequency soft starting device, is characterized in that including control unit, respectively with data wire and control
Synchronizing voltage detector unit that unit is connected, drive circuit, current detecting unit, speed detection unit, and and velocity measuring
The asynchronous machine that unit is connected, the thyristor groups being connected with drive circuit, the Bypass control unit that is connected with thyristor groups.
Asynchronous machine grading variable-frequency soft starting device the most according to claim 1, it is characterised in that described synchronizing voltage
Detector unit, by the transformator being sequentially connected with the signal of telecommunication, band filter, LM339 voltage comparator, two-way differential comparator
Composition.
Asynchronous machine grading variable-frequency soft starting device the most according to claim 1, it is characterised in that described drive circuit,
Being made up of two audions and a pulse transformer, one of them audion is connected with the input of pulse transformer, another
Individual audion is connected with the outfan of pulse transformer.
Asynchronous machine grading variable-frequency soft starting device the most according to claim 1, it is characterised in that described current detecting
Unit, is made up of the current sensor being sequentially connected with the signal of telecommunication, three-phase bridge rectification circuit, LM339 voltage follower.
Asynchronous machine grading variable-frequency soft starting device the most according to claim 1, it is characterised in that described velocity measuring
Unit, is made up of a speed detection sensor.
Asynchronous machine grading variable-frequency soft starting device the most according to claim 1, it is characterised in that described control unit,
Employing TMS320F28335DSP is master controller.
Asynchronous machine grading variable-frequency soft starting device the most according to claim 1, it is characterised in that described Bypass Control
Unit, by the optical coupling isolator TLP521 being sequentially connected with the signal of telecommunication, Darlington display reverse driven MC1413, relay,
Catalyst forms.
Asynchronous machine grading variable-frequency soft starting device the most according to claim 1, it is characterised in that described thyristor groups,
Being made up of three pairs of IGCTs, after its inverse parallel connection, the threephase stator with asynchronous machine is connected in series.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620651885.6U CN205829504U (en) | 2016-06-27 | 2016-06-27 | A kind of asynchronous machine grading variable-frequency soft starting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620651885.6U CN205829504U (en) | 2016-06-27 | 2016-06-27 | A kind of asynchronous machine grading variable-frequency soft starting device |
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| CN205829504U true CN205829504U (en) | 2016-12-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108718169A (en) * | 2018-07-03 | 2018-10-30 | 广东水利电力职业技术学院（广东省水利电力技工学校） | A kind of asynchronous machine grading variable-frequency soft starting device machine control method and system |
-
2016
- 2016-06-27 CN CN201620651885.6U patent/CN205829504U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108718169A (en) * | 2018-07-03 | 2018-10-30 | 广东水利电力职业技术学院（广东省水利电力技工学校） | A kind of asynchronous machine grading variable-frequency soft starting device machine control method and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161221 Termination date: 20170627 |