CN1808881A - High torque soft starter with graded AC-AC frequency conversion method - Google Patents
High torque soft starter with graded AC-AC frequency conversion method Download PDFInfo
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Abstract
This invention relates to class alternating frequency high torque flexible starting device, which can reduce current and improve starting torque to realize real flexible parking and motor short working low speed operation and braking status. This invention alters voltage frequency in the starting process and adopts the variable frequency method to realize slide lift flexible starting and adopts semi-wave variable frequency and adopts three-phase trigger impulse control circuit to generate three-phase modulation impulse signals.
Description
One, technical field:
The present invention relates to a kind of high torque soft starter that adopts graded AC-AC frequency conversion method, it adopts graded AC-AC frequency conversion method, and motor is started smoothly with high starting torque and little starting current.
Two, background technology:
AC asynchronous motor is with its simple structure, high operational reliability, extremely strong adaptive capacity to environment and excellent drag performance and obtained to use widely in the every field of national economy, but its fatal shortcoming is that starting-impact is big, can cause adverse effect to electrical network and equipment.In order to solve starting problem, people have adopted several different methods for a long time: star/triangle conversion starting is arranged, autotransformer reduced voltage starting, saturable reactor and switch transformer reduced voltage starting, and method such as water resistance reduced voltage starting.To the seventies in last century, begin to adopt the thyristor phase shift to trigger soft-start by lowering voltage, promptly present commercially available electronic type soft starter, Fig. 1 is the control block diagram of soft starter.Up to the present, all soft start equipment all is to adopt the method that reduces starting voltage to start AC asynchronous motor, because the electromagnetic torque of motor is directly proportional for alive square with its winding institute, when stator voltage reduces, its electromagnetic torque can reduce a lot, so only be fit to the motor of starting zero load or light start, general starting torque should be less than about 50% of nominal torque.For the motor of need heavy-load start,, then also inapplicable as ball mill, pulverizer, mine crane etc.The not frequency reducing owing to common soft starter step-down in addition owing to the existence of big revolutional slip, can occur big starting current inevitably, thereby limit the scope of application of soft starter widely in starting process.
The variable-frequency control technique that last century, the eighties grew up except that the operation of may command electric machine speed regulation, has also ideally solved the soft start problem of asynchronous machine.But because it costs an arm and a leg, for not needing speed governing, just to the equipment that solves starting problem, using frequency converter to realize soft start, is very uneconomic, also is that institute of general industrial enterprise is unaffordable.
Three, summary of the invention:
The present invention is in order to solve the weak point in the above-mentioned background technology, a kind of high torque soft starter that adopts graded AC-AC frequency conversion method is provided, it not only can reduce starting current, improve starting torque, can also realize real soft stop and make the motor short-term operation in low cruise and counter-rotating on-position.
For achieving the above object, the technical solution used in the present invention is:
A kind of high torque soft starter that adopts graded AC-AC frequency conversion method, its special character is: both changed voltage and also change frequency in starting process, and adopted graded AC-AC frequency conversion method, frequency is divided multistage lifting, realizes level and smooth raising speed soft start.
Comprise and adopt the half-wave AC-AC frequency conversion method, frequency-distributed ground divides 8 grades of liftings, by f/16 → f/13 → f/10 → f/7 → f/4 → f/3 → f/2 → f (50HZ) → be incorporated into the power networks.
Comprise the frequency division grade of employing positive phase sequence balance and the phase combination of positive torque maximum, realize the steady raising speed of soft starter.
Comprise and adopt integrated circuit to carry out phase sequence identification, promptly discerning input voltage is positive phase sequence or negative-phase sequence, realizes the correct triggering to thyristor.
Comprise and adopt three-phase trigger pulse row phase-control circuit, produce the three-phase six-beat modulated pulse signal.
Comprise and adopt gate circuit frequency-selecting control circuit, realize variable frequency control thyristor to produce three-phase semiwave AC-AC frequency conversion modulated square wave signal.
Comprise and adopt 16 single-chip microcomputer 80C196KC that utilize its three road PWM output to produce the three-phase six-beat modulated square wave, the trigger sequence of control thyristor is realized the control of graded AC-AC frequency conversion and phase-shift voltage regulating as Controlled CPU.
Compared with prior art, the advantage and the effect that have of the present invention is as follows:
1, the present invention is in order to improve the starting torque of electronic type soft starter, reduce starting current, adopted classification to hand over alternation method frequently, utilize the hardware configuration of former soft starter, by controlling the trigger sequence of three-phase thyristor dexterously, when changing voltage, also change the frequency of alternating current, realized the V/f control soft start of high torque (HT).Frequency diversity promotes: by f/16 → f/13 → f/10 → f/7 → f/4 → f/3 → f/2 → f (50HZ) → be incorporated into the power networks.Realized real level and smooth raising frequency soft start, and improved starting torque, reduced starting current, be more suitable in the load of need heavy-load start.
2, soft starter of the present invention has kept all functions of traditional electrical minor soft starter, has current limit starting, and three kinds of modes of alternation high torque (HT) starting are frequently handed in the voltage starting of two Dou slope, classification, can be set by keyboard according to the requirement that drags load by the user.Novel Intelligent Soft Starter LI Wujiu has that starting current is little, and starting torque is big, and starting is level and smooth, and is stable, the characteristics that controlled function is strong.
3, the present invention adopts classification to hand over the soft starter of an alternation frequency method, realized real level and smooth raising frequency soft start, starting-impact and starting current have been reduced, improved starting torque, can make motor smooth starting under full load, owing to kept the hardware configuration of traditional electrical minor soft starter, just changed the generation order and the control method of thyristor trigger impulse, thereby can not increase the cost expenditure; And on starting performance, can be better than traditional soft-start by lowering voltage device greatly, can realize being similar to the soft starting characteristic of frequency converter.Thereby can't but be breakthrough, thereby can expand the scope of application and the market share of electronic type soft starter greatly to the revolution of electronic type soft starter.
4, the present invention adopts classification to hand over the soft starter of an alternation frequency method can also realize low cruise and low speed and reverse braking function in short-term easily, so that realize accurate stopping.Especially for load of the pumps, can ideally realize soft stop controlled function, thoroughly eliminate impact of water hammer as frequency converter.
Four, description of drawings:
Fig. 1 is the control block diagram of existing soft starter;
Phase voltage waveform figure when Fig. 2 is 25HZ and 10HZ;
Phase voltage waveform figure when Fig. 3 is four frequency divisions and five frequency divisions;
Fig. 4 is two divided-frequency (25HZ) three-phase voltage oscillogram;
Fig. 5 is three frequency division (16.67HZ) three-phase voltage oscillogram;
Fig. 6 is the two divided-frequency voltage vector-diagram;
Fig. 7 is the three frequency division voltage vector-diagram;
Fig. 8 is three-phase phase-sequence and lack detection circuit TC783A logic diagram;
Fig. 9 is a three-phase trigger control circuit TC787DS logic diagram;
Figure 10 is a triggering signal combinatorial principle block diagram;
The three-phase modulations square wave figure that Figure 11 produces for CPU;
Electric current, torque and speed curves figure when Figure 12 is the classification variable frequency soft start;
Figure 13 is the electromagnetic torque comparison diagram of three kinds of start modes;
Figure 14 is the stator current comparison diagram of three kinds of start modes;
Figure 15 is the master control program FB(flow block);
Figure 16 is the subprogram FB(flow block).
Five, embodiment:
The present invention is in order to improve the starting torque of electronic type soft starter, reduce starting current, adopted classification to hand over alternation method frequently, utilize the hardware configuration of former soft starter, by controlling the trigger sequence of three-phase thyristor dexterously, when changing voltage, also change the frequency of alternating current, realized the V/F control soft start of high torque (HT).Frequency diversity promotes: by f/16 → f/13 → f/10 → f/7 → f/4 → f/3 → f/2 → f (50HZ) → be incorporated into the power networks.Realized real level and smooth raising frequency soft start, and improved starting torque, reduced starting current, be more suitable in the load of need heavy-load start.
(1) principle of sinusoidal wave frequency division:
The three phase sine alternating current to be handed over an alternation frequently, can only realize the 1/n frequency division, as f/2, f/3 ... f/n.Method is by the break-make of thyristor control alternating current, and the alternating current in n cycle is merged into one-period, only allows the conducting of forward half-wave during its positive half cycle, then allows reverse half-wave conducting during negative half period.Phase voltage waveform figure when Fig. 2 is 25HZ and 10HZ.
Because frequency has reduced, the cycle has increased.Originally the time of the sinusoidal wave half period of 50HZ is 10ms, and the phase angle is 180 °, and in the new frequency (cycle) behind frequency division, the phase angle of former half period only is 180 °/n.Being 90 ° during as two divided-frequency, is 60 ° during three frequency division, is 36 ° during five frequency divisions.Corresponding waveform parameter when table 1 is the 1-20 frequency division.
Table 1: alternation parameter list is frequently handed in classification
| Divider ratio | Frequency (HZ) | Cycle (ms) | The half-wave phase angle | Initial phase angle | Phase equilibrium | Amplitude balance |
| 1 | 50.0 | 20 | 180° | ±120° | The positive phase sequence balance | 1∶1∶1 |
| 2 | 25.0 | 40 | 90° | ±60° | The negative-phase sequence balance | 1∶1∶1 |
| 3 | 16.67 | 60 | 60° | ±40° | Uneven | 2∶1∶1 |
| 4 | 12.5 | 80 | 45° | ±30° | The positive phase sequence balance | ☆ |
| 5 | 10.0 | 100 | 36° | ±24° | The negative-phase sequence balance | △ |
| 6 | 8.33 | 120 | 30° | ±20° | Uneven | |
| 7 | 7.14 | 140 | 25.71 | ±17.14 | The positive phase sequence balance | ☆ |
| 8 | 6.25 | 160 | 22.5 | ±15° | The negative- | |
| 9 | 5.55 | 180 | 20° | ±13.33 | Uneven | |
| 10 | 5.0 | 200 | 18° | ±12° | The positive phase sequence balance | |
| 11 | 4.54 | 220 | 16.36 | ±10.9 | The negative-phase sequence balance | △ |
| 12 | 4.16 | 240 | 15° | ±10° | Uneven | |
| 13 | 3.846 | 260 | 13.846 | ±9.23 | The positive phase sequence balance | ☆ |
| 14 | 3.57 | 280 | 12.857 | ±8.57 | The negative- | |
| 15 | 3.33 | 300 | 12° | ±8° | Uneven | |
| 16 | 3.125 | 320 | 11.25 | ±7.5 | The positive phase sequence balance | |
| 17 | 2.94 | 340 | 10.588 | ±7.058 | The negative-phase sequence balance |
| 18 | 2.77 | 360 | 10° | ±6.67 | Uneven | |
| 19 | 2.63 | 380 | 9.47 | ±6.31 | The positive | |
| 20 | 2.5 | 400 | 9° | ±6 | The negative-phase sequence balance |
Each phase zero crossing phase angle in new frequency of primary sinusoid is respectively:
Two divided-frequency: negative-phase sequence balance
| 0° | 90° | 180° | 270° | 360° |
| 60° | 150° | 240° | 330° | 60° |
| -60° | 30° | 120° | 210° | 300° |
Three frequency division: imbalance
| 0° | 60° | 120° | 180° | 240° | 300° | 360° |
| 40° | 100° | 160° | 220° | 280° | 340° | 40° |
| -40° | 20° | 80° | 140° | 200° | 260° | 320° |
Four frequency divisions: positive phase sequence balance
| 0° | 45° | 90° | 135° | 180° | 225° | 270° | 315° | 360° |
| 30° | 75° | 120° | 165° | 210° | 255° | 300° | 345° | 30° |
| -30° | 15° | 60° | 105° | 150° | 195° | 240° | 285° | 330° |
Five frequency divisions: negative-phase sequence balance
| 0° | 36° | 72° | 108° | 144° | 180° | 216° | 252° | 288° | 324° | 360° |
| 24° | 60° | 96° | 132° | 168° | 204° | 240° | 276° | 312° | 348° | 24° |
| -24° | 12° | 48° | 84° | 120° | 156° | 192° | 228° | 264° | 300° | 336° |
From as can be seen above, what is interesting is: the waveform behind the frequency division is along with the frequency division number of times is periodic variation:
1,4,7,10,13,16,19 ... frequency division, the positive phase sequence balance;
2,4,8,11,14,17,20 ... frequency division, the negative-phase sequence balance;
3,6,9,12,15,18 ... phase place and amplitude are all uneven during frequency division.
In addition, in the frequency division for positive and negative phase sequence balance, can not only accomplish the balance of phase place and amplitude during odd number time frequency division, its waveform also is balance on time shaft, and even number time frequency division then its waveform is uneven on time shaft.Oscillogram when Fig. 3 is four frequency divisions and five frequency divisions has clearly illustrated this point.
So when selecting the frequency division step, should select phase place as far as possible, the frequency division number of times of the equal balance of waveform on amplitude and the time shaft, this realizes easily in low-frequency range, as 13 frequency divisions (3.846HZ) and 7 frequency divisions (7.14HZ) of positive phase sequence balance, and 11 frequency divisions (4.54HZ) of negative-phase sequence balance and 5 frequency divisions (10HZ).But at high band owing to be in crucial frequency range, then to adopt inevitably can not complete equipilibrium frequency division, as 4 frequency divisions (12.5HZ), or complete unbalanced frequency division, just can't avoid as 3 frequency divisions (16.67HZ) and positive phase sequence 2 frequency divisions (25HZ).At this moment can only in all phase combination, select one group of the positive torque maximum of generation and realize frequency division.Two divided-frequency has 43=64 kind phase combination.The positive torque battle array maximum of wherein 0 °, 60 °, 210 ° groups and 0 °, 150 °, 210 ° group, waveform is seen Fig. 4 (the thyristor conducting of black region correspondence), voltage vector is seen Fig. 6.
Total 63=216 kind phase combination during three frequency division.The positive torque maximum of wherein 0 °, 100 °, 260 ° groups and 0 °, 160 °, 260 ° group, its three-phase voltage waveform is seen Fig. 5 (the thyristor conducting of black region correspondence), voltage vector is seen Fig. 7.
(2) control of the selection of frequency division step and torque
Frequently level is selected
Characteristics according to above-mentioned sinusoidal wave frequency division, through taking all factors into consideration, select the odd number time frequency division of positive phase sequence balance in low-frequency range, whole Soft Start-up Process is divided into eight grades and finishes: f/16 → f/13 → f/10 → f/7 → f/4 → f/3 → f/2 → f (50HZ) → be incorporated into the power networks as far as possible.
Can be undertaken by opposite order during soft stop.And f/11, f/5, f/2 can be used as the frequency of anti-phase low cruise or electromagnetic braking and use, but can not finish reverse Soft Start-up Process, because its phase sequence is opposite, can not carries out the transition to the operation of 50HZ positive phase sequence from f/2 at last, otherwise will be the soft start frequency division grade more even more ideal than positive phase sequence frequency division.
Torque control
When AC induction motor was moved in frequency reducing, should consider had enough low-frequency torques, can not make the motor overexcitation again, cause vibration and heating, generally should control, suitably improve its low-frequency torque by the proportional principle of V/f, allow motor start smoothly, pretend following arrangement with high starting torque:
F/13---2 wave head conductings are arranged, 200% nominal torque in the half period;
F/7---2 wave head conductings are arranged, 200% nominal torque in the half period;
F/4---1 wave head conducting is arranged, 100% nominal torque in the half period;
F/3---1 or 2 wave head conductings are arranged, 100% nominal torque in the half period;
F/2---1 wave head conducting is arranged, 100% nominal torque in the half period;
Because voltage, electric current are discontinuous, thereby torque pulse, considers this factor, and actual torque is less than above-mentioned value, but it is enough than the soft-start by lowering voltage raising.
If adopt excessive V/f ratio, then can increase the vibration and the heating of motor, real this necessity of nothing.
(3) phase sequence identification and triggering control
Phase sequence identification
To hand over an alternation frequently to three phase sine power supply realization classification, at first must carry out phase sequence and detect, could realize correct triggering control.In order to simplify circuit structure, the application-specific integrated circuit chip TC783A that has adopted three-phase phase-sequence and phase shortage to detect, its circuit block diagram is seen Fig. 8.
Three-phase voltage signal A, B, C enter circuit 1,2,3 pin respectively through resistor voltage divider network, carry out Schmidt by the offset of sinusoidal ripple and detect the existence of understanding signal and send into the output indication of lack detection circuit detection back.When three phase sine input just often, output 12,11,10 pin of corresponding A, B, C input 1,2,3 pin are output as low level; When not having input signal mutually, on the corresponding output pin high level will be arranged when a certain.The result who detects according to phase shortage, the phase sequence indicating circuit will export the phase sequential signal under the situation of phase shortage not, 9 pin output high level indication positive phase sequence, 8 pin are exported high level and are then indicated negative-phase sequence.Under non-full-phase state, 8 pin, 9 pin are output low level all.
Trigger control
Basic three-phase trigger pulse sequence is produced by phase-control circuit TC787DS, TC787DS is the monolithic integrated circuit that adopts advanced IC technological design to make, can produce the three-phase six-beat modulated pulse signal, can use for the trigger impulse of three-phase fully-controlled rectification, pressure regulation, it is little to have power consumption, and function is strong, the input impedance height, good in anti-interference performance, advantage such as phase shift range is wide, and outward element is few.Its circuit block diagram is seen Fig. 9.
The trigger impulse that TC787DS produces be listed as after the modulated square wave signal that gate circuit and CPU send and frequency division/power frequency control signal make up, and hands over the needed trigger impulse control sequence of frequency division with regard to producing, and sees Figure 10, shown in Figure 11.
Controlled CPU
Soft starter has adopted 16 single-chip microcomputer 80C196KC as Controlled CPU, utilizes its three road PWM output to produce the three-phase modulations square wave, and the trigger sequence of six thyristors of control three-phase is finished classification and handed over alternation frequency and phase-shift voltage regulating controlled function.Finish the function of man-machine interactive keyboard and laser-emitting diode reason simultaneously, and the phase shortage, short circuit, overcurrent, overload of motor in starting and running, defencive function such as overheated.
Novel soft starter has kept all functions of traditional electrical minor soft starter, has current limit starting, and three kinds of modes of alternation high torque (HT) starting are frequently handed in the voltage starting of two Dou slope, classification, can be set by keyboard according to the requirement that drags load by the user.Novel Intelligent Soft Starter LI Wujiu has that starting current is little, and starting torque is big, and starting is level and smooth, and is stable, the characteristics that controlled function is strong.
(4) experimental result
Because classification hands over an alternation to belong to the control of single-phase half-wave frequently, by the voltage waveform of Fig. 4, Fig. 5 as can be seen, stator voltage is discontinuous, so stator current also is discontinuous, torque also is discontinuous, pulsation.Therefore motor has vibration and noise (low frequency) when operation, has only the high-frequency noise of modulating pulse unlike variable frequency soft start, and this is distinguishing.So when adopting classification to hand over an alternation frequently, motor should not long-time running under the low frequency state, otherwise motor will produce vibration and generate heat.
4 utmost point motors with a 15KW are tested.In starting process, 6 grades of frequencies automatically switch successively, and every grade of duration was 5～10 seconds, was decided by the needs that drag load.When each frequency is switched,, revolutional slip is increased, thereby electric current increase because synchronous speed increases suddenly; Along with the rising of rotating speed, revolutional slip reduces, and electric current also reduces thereupon.Because it is limited that each step frequency increases, thereby be limited, come, cannot be mentioned in the same breath compared with across-the-line starting and soft-start by lowering voltage because of revolutional slip increases the electric current increase that causes.Electric current, torque and speed curves when Figure 12 is the level variable frequency soft start.
As can be seen from Figure 12, the stator current curve is divided into 6 sections, and in each section, when frequency was just switched, because synchronous speed increases suddenly, revolutional slip increased, so electric current increases immediately.Along with the increase of rotating speed, revolutional slip reduces gradually afterwards, and electric current also reduces thereupon, finally reaches and the corresponding stable state of this band frequency.Torque is pulsed, and rotating speed rises well-balancedly.
Figure 13 is that the starting torque of three kinds of start modes compares.The electromagnetic torque minimum of soft start wherein, during low speed, the classification varying frequency starting is more a lot of greatly than the electromagnetic torque of soft start, and is big during also than soft start during middling speed.Therefore, adopt the classification frequency conversion can obviously improve starting torque.
Figure 14 is across-the-line starting, and the stator current of traditional soft starting and classification varying frequency starting mode compares, and the electric current of across-the-line starting is very big among the figure, and soft start is taken second place, and the electric current of classification varying frequency starting is less.
(5) conclusion
Adopt classification to hand over the soft starter of an alternation frequency method, realized real level and smooth raising frequency soft start, reduced starting-impact and starting current, improved starting torque, can make motor smooth starting under full load.Owing to kept the hardware configuration of traditional electrical minor soft starter, just changed the generation order and the control method of thyristor trigger impulse, thereby can not increase the cost expenditure; And on starting performance, can be better than traditional soft-start by lowering voltage device greatly, can realize being similar to the soft starting characteristic of frequency converter.Thereby can't but be breakthrough, thereby can expand the scope of application and the market share of electronic type soft starter greatly to the revolution of electronic type soft starter.
Adopt classification to hand over the soft starter of an alternation frequency method can also realize low cruise and low speed and reverse braking function in short-term easily, so that realize accurate stopping.Especially for load of the pumps, can ideally realize soft stop controlled function, thoroughly eliminate impact of water hammer as frequency converter.
Claims (7)
1, a kind of high torque soft starter that adopts graded AC-AC frequency conversion method is characterized in that: both changed voltage and also change frequency in starting process, and adopted graded AC-AC frequency conversion method, frequency is divided multistage lifting, realizes level and smooth raising speed soft start.
2, a kind of high torque soft starter that adopts graded AC-AC frequency conversion method according to claim 1, it is characterized in that: comprise and adopt the half-wave AC-AC frequency conversion method, frequency-distributed ground divides 8 grades of liftings, by f/16 → f/13 → f/10 → f/7 → f/4 → f/3 → f/2 → f (50HZ) → be incorporated into the power networks.
3, a kind of high torque soft starter that adopts graded AC-AC frequency conversion method according to claim 2 is characterized in that: comprise the frequency division grade of employing positive phase sequence balance and the phase combination of positive torque maximum, realize the steady raising speed of soft starter.
4, a kind of high torque soft starter that adopts graded AC-AC frequency conversion method according to claim 3, it is characterized in that: comprise and adopt integrated circuit to carry out phase sequence identification, promptly discerning input voltage is positive phase sequence or negative-phase sequence, realizes the correct triggering to thyristor.
5, a kind of high torque soft starter that adopts graded AC-AC frequency conversion method according to claim 4 is characterized in that: comprise and adopt three-phase trigger pulse row phase-control circuit, produce the three-phase six-beat modulated pulse signal.
6, a kind of high torque soft starter that adopts graded AC-AC frequency conversion method according to claim 5, it is characterized in that: comprise and adopt gate circuit frequency-selecting control circuit, realize variable frequency control thyristor to produce three-phase semiwave AC-AC frequency conversion modulated square wave signal.
7, according to claim 1,2,3,4,5 or 6 described a kind of high torque soft starters that adopt graded AC-AC frequency conversion method, it is characterized in that: comprise and adopt 16 single-chip microcomputer 80C196KC as Controlled CPU, utilize its three road PWM output to produce the three-phase six-beat modulated square wave, the trigger sequence of control thyristor is realized the control of graded AC-AC frequency conversion and phase-shift voltage regulating.
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| CN102104355A (en) * | 2011-03-24 | 2011-06-22 | 淄博市临淄银河高技术开发有限公司 | Intelligent built-in electronic arc-blowout bypass type soft starter |
| CN101411052B (en) * | 2006-07-26 | 2012-04-18 | 荣信电力电子股份有限公司 | Soft startup method and apparatus for pole frequency conversion motor |
| CN102904492A (en) * | 2011-07-28 | 2013-01-30 | 万洲电气股份有限公司 | Graded frequency conversion stepless voltage regulating soft starting device based on non-speed sensor |
| CN103532446A (en) * | 2013-10-28 | 2014-01-22 | 桂林君泰福电气有限公司 | Control method and control device for controlling soft start of induction motor |
| CN103904955A (en) * | 2012-12-25 | 2014-07-02 | 上海电科电器科技有限公司 | Soft start equivalent sinusoidal frequency-dividing control method and control device |
| CN104734574A (en) * | 2015-03-27 | 2015-06-24 | 安徽农业大学 | Soft start method used for three-phase intermediate-frequency motor |
| CN104753400A (en) * | 2015-04-23 | 2015-07-01 | 山东泰开自动化有限公司 | Variable frequency soft-starting method of high-voltage asynchronous motor |
| US9350275B2 (en) | 2014-05-19 | 2016-05-24 | Rockwell Automation Technologies, Inc. | Quasi variable frequency motor controller |
| 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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| CN102104355A (en) * | 2011-03-24 | 2011-06-22 | 淄博市临淄银河高技术开发有限公司 | Intelligent built-in electronic arc-blowout bypass type soft starter |
| CN102904492A (en) * | 2011-07-28 | 2013-01-30 | 万洲电气股份有限公司 | Graded frequency conversion stepless voltage regulating soft starting device based on non-speed sensor |
| CN103904955B (en) * | 2012-12-25 | 2016-08-10 | 上海电科电器科技有限公司 | Soft start equivalent sine frequency division control method and control device |
| CN103904955A (en) * | 2012-12-25 | 2014-07-02 | 上海电科电器科技有限公司 | Soft start equivalent sinusoidal frequency-dividing control method and control device |
| CN103532446A (en) * | 2013-10-28 | 2014-01-22 | 桂林君泰福电气有限公司 | Control method and control device for controlling soft start of induction motor |
| CN103532446B (en) * | 2013-10-28 | 2016-02-17 | 桂林君泰福电气有限公司 | A kind of control method of induction motor soft start and control device |
| US9350275B2 (en) | 2014-05-19 | 2016-05-24 | Rockwell Automation Technologies, Inc. | Quasi variable frequency motor controller |
| US9685898B2 (en) | 2014-05-19 | 2017-06-20 | Rockwell Automation Technologies, Inc. | Quasi vector motor controller |
| CN104734574A (en) * | 2015-03-27 | 2015-06-24 | 安徽农业大学 | Soft start method used for three-phase intermediate-frequency motor |
| CN104734574B (en) * | 2015-03-27 | 2017-10-24 | 安徽农业大学 | A kind of soft-start method for three-phase mid-frequency motor |
| CN104753400A (en) * | 2015-04-23 | 2015-07-01 | 山东泰开自动化有限公司 | Variable frequency soft-starting method of high-voltage asynchronous motor |
| CN104753400B (en) * | 2015-04-23 | 2017-09-26 | 山东泰开自动化有限公司 | A kind of high-voltage asynchronous motor frequency conversion soft start method |
| 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 |
| CN112688594A (en) * | 2020-12-21 | 2021-04-20 | 大力电工襄阳股份有限公司 | Variable frequency soft start control method |
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