CN1599230A - Discrete variable frequency starting system of AC induction motor and starting method - Google Patents
Discrete variable frequency starting system of AC induction motor and starting method Download PDFInfo
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Abstract
A discrete frequency conversion start-up system of the alternating current impression electromotor and its start-up method. It includes mutual inductor, amplifier, crystal brake, processor, liquid crystal screen, chip machine and keyboard. The steps are as follows: program initialization, detect the initial follow current angle, set the trigger angle of the discrete frequency conversion frequency and make the minimal trigger angle larger than initial follow current angle; frequency division trigger subprogram, frequency division trigger subprogram, frequency division trigger subprogram, frequency division trigger subprogram, frequency division trigger subprogram and flexible start-up subprogram. The invention can make the three-phase alternating current induction motor start up normally when it is heavily loaded and fully loaded.
Description
Technical field:
What the present invention relates to is discrete variable frequency starting system of a kind of induction alternating current (AC) motor and startup method thereof.
Background technology:
Existing motor soft starter based on the thyristor voltage regulation principle replaces traditional reduced voltage starting method gradually.Utilize the thyristor voltage regulation circuit that three phase electric machine is started control, the input voltage of motor is ascending to rise gradually, until reaching supply voltage.Make voltage adjustable continuously, electric current is continuous, saves gearshift hard switchings such as contactor, relay, has reduced the volume of starting equipment, and motor is not had specific (special) requirements, and cost is low, and controllability is good.Fig. 1 has provided and has been applied to the soft starter basic structure that three phase electric machine drives.Yet a very big shortcoming of reduced voltage starting is falling of starting electromagnetic torque.Square being directly proportional of the starting torque of motor and added stator side terminal voltage reduces voltage and will seriously reduce starting torque, can make the motor rotation blockage protection when heavy duty, full load starting and starting failure.In actual applications, motor all is band heavy duty even full load starting under many environment, as conveyer belt, and crane etc.The traditional soft starter in this case, has to adopt the across-the-line starting mode with powerless, and this can produce the impact that the excessive starting current of very big harm: a. can cause electrical network again; B. manufacturing machine is impacted; C. not controlled starting can cause the failure of high capacity motor starting when overload or low-voltage.
Summary of the invention:
The purpose of this invention is to provide discrete variable frequency starting system of a kind of induction alternating current (AC) motor and startup method thereof.The present invention can solve three-phase alternating-current induction motor band heavy duty, full load can't normal starting problem.The present invention comprises motor 11, and it also comprises threephase current transformer 1, three-phase anti-parallel thyristor 2, first operational amplifier 3, pulse transforming trigger 4, second operational amplifier 5, the 3rd operational amplifier 6, microprocessor 7, LCD 8, single-chip microcomputer 9, keyboard 10; Three-phase alternating current also is connected with three voltage detecting inputs of first operational amplifier 3 respectively through three inputs that threephase current transformer 1 connects three-phase anti-parallel thyristor 2 respectively, three outputs of three-phase anti-parallel thyristor 2 connect three inputs of motor 11 respectively and are connected with three voltage detecting inputs of second operational amplifier 5 respectively, the 4th signal output part of threephase current transformer 1 connects the signal input part of the 3rd operational amplifier 6, the current signal that the signal output part of the 3rd operational amplifier 6 connects microprocessor 7 detects input, the voltage signal that the signal output part of first operational amplifier 3 connects microprocessor 7 detects input, another voltage signal that the signal output part of second operational amplifier 5 connects microprocessor 7 detects input, the control signal output ends of microprocessor 7 connects the signal input part of pulse transforming trigger 4, the signal output part of pulse transforming trigger 4 connects the signal input end of three-phase anti-parallel thyristor 2, the data input/output terminal of microprocessor 7 connects the data I/O of single-chip microcomputer 9, the shows signal output of single-chip microcomputer 9 connects the signal input part of LCD 8, and the output of keyboard 10 connects the signal input part of single-chip microcomputer 9; The internal processes operating procedure of its microprocessor 7 is: program initialization 01, detect initial afterflow angle 02, and the trigger angle that each discrete frequency conversion frequency is set makes minimum trigger angle greater than initial afterflow angle 03; Move 16 frequency divisions and trigger subprogram, its running time be one-period that 0.32 second 04,16 frequency division triggers the frequency 3.125Hz correspondence of subprogram to comprise the number of power frequency half period be 32, weave into 32 groups; One, triggers the 1st, 3,5,7,9,11,13,15,17 group an of phase wherein, constitute the positive half cycle of 16 frequency division voltages; Trigger the 18th, 20,22,24,26,28,30,32 group, constitute the negative half period of 16 frequency division voltages, control the trigger angle of each group respectively and spend between 150 degree 30, and by the afterflow angle decision of electric current after voltage over zero; Two, control the trigger angle of each group according to the sinusoidal rule of equivalence, make its effective value approach the sine value of this group, trigger angle is big more, and effective value is more little; Be 56 when spending at initial afterflow angle, the trigger angle of respectively organizing in the 16 frequency division voltage positive half periods is followed successively by: 110 degree, 100 degree, 90 degree, 60 degree, 60 degree, 90 degree, 90 degree, 100 degree, 110 degree, and the trigger angle of respectively organizing in the negative half-cycle is followed successively by: 110 degree, 100 degree, 90 degree, 60 degree, 60 degree, 90 degree, 90 degree, 100 degree; Wherein minimum trigger angle also is greater than initial afterflow angle; Two-phase is handled equally in addition; Move 13 frequency divisions and trigger subprogram, its running time be one-period that 0.26 second 05,13 frequency division triggers the frequency 3.8Hz correspondence of subprogram to comprise the number of power frequency half period be 26, weave into 26 groups; One, triggers the 1st, 3,5,7,9,11,13 group an of phase wherein, constitute the positive half cycle of 13 frequency division voltages; Trigger the 14th, 16,18,20,22,24,26 group, constitute the negative half period of 13 frequency division voltages, control the trigger angle of each group respectively and spend between 150 degree 30, and by the afterflow angle decision of electric current after voltage over zero; Two, control the trigger angle of each group according to the sinusoidal rule of equivalence, make its effective value approach the sine value of this group, trigger angle is big more, and effective value is more little; The trigger angle of respectively organizing in the 13 frequency division voltage positive half periods is followed successively by: 100 degree, 80 degree, 80 degree, 80 degree, 80 degree, 80 degree, 100 degree, and negative half period is identical with the trigger angle of positive half cycle; Two-phase is handled equally in addition; Move 10 frequency divisions and trigger subprogram, its running time be one-period that 0.20 second 06,10 frequency division triggers the frequency 5Hz correspondence of subprogram to comprise the number of power frequency half period be 20, weave into 20 groups; One, triggers the 1st, 3,5,7,9,11 group an of phase wherein, constitute the positive half cycle of 10 frequency division voltages; Trigger the 12nd, 14,16,18,20 group, constitute the negative half period of 10 frequency division voltages, control the trigger angle of each group respectively and spend between 150 degree 30, and by the afterflow angle decision of electric current after voltage over zero; Two, control the trigger angle of each group according to the sinusoidal rule of equivalence, make its effective value approach the sine value of this group, trigger angle is big more, and effective value is more little; The trigger angle of respectively organizing in the 10 frequency division voltage positive half periods is followed successively by: 100 degree, 80 degree, 80 degree, 80 degree, 80 degree, 100 degree, and negative half period is identical with the trigger angle of positive half cycle; Two-phase is handled equally in addition; Move 7 frequency divisions and trigger subprogram, its running time be one-period that 0.28 second 07,7 frequency division triggers the frequency 7.1Hz correspondence of subprogram to comprise the number of power frequency half period be 14, weave into 14 groups; One, triggers the 1st, 3,5,7 group an of phase wherein, constitute the positive half cycle of 7 frequency division voltages; Trigger the 8th, 10,12,14 group, constitute the negative half period of 7 frequency division voltages, control the trigger angle of each group respectively and spend between 150 degree 30, and by the afterflow angle decision of electric current after voltage over zero; Two, control the trigger angle of each group according to the sinusoidal rule of equivalence, make its effective value approach the sine value of this group, trigger angle is big more, and effective value is more little; The trigger angle of respectively organizing in the 7 frequency division voltage positive half periods is followed successively by: 100 degree, 75 degree, 75,100 degree, and negative half period is identical with the trigger angle of positive half cycle; Two-phase is handled equally in addition; Move 4 frequency divisions and trigger subprogram, its running time be one-period that 0.4 second 08,4 frequency division triggers the frequency 12.5Hz correspondence of subprogram to comprise the number of power frequency half period be 8, weave into 8 groups; One, triggers the 1st, 3,5 group an of phase wherein, constitute the positive half cycle of 7 frequency division voltages; Trigger the 6th, 8 group, constitute the negative half period of 7 frequency division voltages, control the trigger angle of each group respectively and spend between 150 degree 30, and by the afterflow angle decision of electric current after voltage over zero; Two, control the trigger angle of each group according to the sinusoidal rule of equivalence, make its effective value approach the sine value of this group, trigger angle is big more, and effective value is more little; The trigger angle of respectively organizing in the 4 frequency division voltage positive half periods is followed successively by: 65 degree, 63 degree, 110 degree, negative half period trigger angle are followed successively by 63 degree, 65 degree; Two-phase is handled equally in addition; Soft start subprogram 09.The present invention can make three-phase alternating-current induction motor at band heavy duty, full load normal starting, has little impulse current and big starting torque in the starting process, and has simple in structure, easy care, advantage that cost is low.
Description of drawings:
Fig. 1 is an integrated circuit structural representation of the present invention, and Fig. 2 is the flow chart of program in the microprocessor 7.
Embodiment:
In conjunction with Fig. 1, Fig. 2 present embodiment is described, present embodiment is made up of motor 11, threephase current transformer 1, three-phase anti-parallel thyristor 2, first operational amplifier 3, pulse transforming trigger 4, second operational amplifier 5, the 3rd operational amplifier 6, microprocessor 7, LCD 8, single-chip microcomputer 9, keyboard 10; Three-phase alternating current also is connected with three voltage detecting inputs of first operational amplifier 3 respectively through three inputs that threephase current transformer 1 connects three-phase anti-parallel thyristor 2 respectively, three outputs of three-phase anti-parallel thyristor 2 connect three inputs of motor 11 respectively and are connected with three voltage detecting inputs of second operational amplifier 5 respectively, the 4th signal output part of threephase current transformer 1 connects the signal input part of the 3rd operational amplifier 6, the current signal that the signal output part of the 3rd operational amplifier 6 connects microprocessor 7 detects input, the voltage signal that the signal output part of first operational amplifier 3 connects microprocessor 7 detects input, another voltage signal that the signal output part of second operational amplifier 5 connects microprocessor 7 detects input, the control signal output ends of microprocessor 7 connects the signal input part of pulse transforming trigger 4, the signal output part of pulse transforming trigger 4 connects the signal input end of three-phase anti-parallel thyristor 2, the data input/output terminal of microprocessor 7 connects the data I/O of single-chip microcomputer 9, the shows signal output of single-chip microcomputer 9 connects the signal input part of LCD 8, and the output of keyboard 10 connects the signal input part of single-chip microcomputer 9; The internal processes operating procedure of its microprocessor 7 is: program initialization 01, detect initial afterflow angle 02, and the trigger angle that each discrete frequency conversion frequency is set makes minimum trigger angle greater than initial afterflow angle 03; Move 16 frequency divisions and trigger subprogram, its running time be one-period that 0.32 second 04,16 frequency division triggers the frequency 3.125Hz correspondence of subprogram to comprise the number of power frequency half period be 32, weave into 32 groups; One, triggers the 1st, 3,5,7,9,11,13,15,17 group an of phase wherein, constitute the positive half cycle of 16 frequency division voltages; Trigger the 18th, 20,22,24,26,28,30,32 group, constitute the negative half period of 16 frequency division voltages, control the trigger angle of each group respectively and spend between 150 degree 30, and by the afterflow angle decision of electric current after voltage over zero; Two, control the trigger angle of each group according to the sinusoidal rule of equivalence, make its effective value approach the sine value of this group, trigger angle is big more, and effective value is more little; Be 56 when spending at initial afterflow angle, the trigger angle of respectively organizing in the 16 frequency division voltage positive half periods is followed successively by: 110 degree, 100 degree, 90 degree, 60 degree, 60 degree, 90 degree, 90 degree, 100 degree, 110 degree, and the trigger angle of respectively organizing in the negative half-cycle is followed successively by: 110 degree, 100 degree, 90 degree, 60 degree, 60 degree, 90 degree, 90 degree, 100 degree; Wherein minimum trigger angle also is greater than initial afterflow angle; Two-phase is handled equally in addition; Move 13 frequency divisions and trigger subprogram, its running time be one-period that 0.26 second 05,13 frequency division triggers the frequency 3.8Hz correspondence of subprogram to comprise the number of power frequency half period be 26, weave into 26 groups; One, triggers the 1st, 3,5,7,9,11,13 group an of phase wherein, constitute the positive half cycle of 13 frequency division voltages; Trigger the 14th, 16,18,20,22,24,26 group, constitute the negative half period of 13 frequency division voltages, control the trigger angle of each group respectively and spend between 150 degree 30, and by the afterflow angle decision of electric current after voltage over zero; Two, control the trigger angle of each group according to the sinusoidal rule of equivalence, make its effective value approach the sine value of this group, trigger angle is big more, and effective value is more little; The trigger angle of respectively organizing in the 13 frequency division voltage positive half periods is followed successively by: 100 degree, 80 degree, 80 degree, 80 degree, 80 degree, 80 degree, 100 degree, and negative half period is identical with the trigger angle of positive half cycle; Two-phase is handled equally in addition; Move 10 frequency divisions and trigger subprogram, its running time be one-period that 0.20 second 06,10 frequency division triggers the frequency 5Hz correspondence of subprogram to comprise the number of power frequency half period be 20, weave into 20 groups; One, triggers the 1st, 3,5,7,9,11 group an of phase wherein, constitute the positive half cycle of 10 frequency division voltages; Trigger the 12nd, 14,16,18,20 group, constitute the negative half period of 10 frequency division voltages, control the trigger angle of each group respectively and spend between 150 degree 30, and by the afterflow angle decision of electric current after voltage over zero; Two, control the trigger angle of each group according to the sinusoidal rule of equivalence, make its effective value approach the sine value of this group, trigger angle is big more, and effective value is more little; The trigger angle of respectively organizing in the 10 frequency division voltage positive half periods is followed successively by: 100 degree, 80 degree, 80 degree, 80 degree, 80 degree, 100 degree, and negative half period is identical with the trigger angle of positive half cycle; Two-phase is handled equally in addition; Move 7 frequency divisions and trigger subprogram, its running time be one-period that 0.28 second 07,7 frequency division triggers the frequency 7.1Hz correspondence of subprogram to comprise the number of power frequency half period be 14, weave into 14 groups; One, triggers the 1st, 3,5,7 group an of phase wherein, constitute the positive half cycle of 7 frequency division voltages; Trigger the 8th, 10,12,14 group, constitute the negative half period of 7 frequency division voltages, control the trigger angle of each group respectively and spend between 150 degree 30, and by the afterflow angle decision of electric current after voltage over zero; Two, control the trigger angle of each group according to the sinusoidal rule of equivalence, make its effective value approach the sine value of this group, trigger angle is big more, and effective value is more little; The trigger angle of respectively organizing in the 7 frequency division voltage positive half periods is followed successively by: 100 degree, 75 degree, 75,100 degree, and negative half period is identical with the trigger angle of positive half cycle; Two-phase is handled equally in addition; Move 4 frequency divisions and trigger subprogram, its running time be one-period that 0.4 second 08,4 frequency division triggers the frequency 12.5Hz correspondence of subprogram to comprise the number of power frequency half period be 8, weave into 8 groups; One, triggers the 1st, 3,5 group an of phase wherein, constitute the positive half cycle of 7 frequency division voltages; Trigger the 6th, 8 group, constitute the negative half period of 7 frequency division voltages, control the trigger angle of each group respectively and spend between 150 degree 30, and by the afterflow angle decision of electric current after voltage over zero; Two, control the trigger angle of each group according to the sinusoidal rule of equivalence, make its effective value approach the sine value of this group, trigger angle is big more, and effective value is more little; The trigger angle of respectively organizing in the 4 frequency division voltage positive half periods is followed successively by: 65 degree, 63 degree, 110 degree, negative half period trigger angle are followed successively by 63 degree, 65 degree; Two-phase is handled equally in addition; Soft start subprogram 09.
Claims (2)
1, the discrete variable frequency starting system of induction alternating current (AC) motor, it comprises motor (11), it is characterized in that it also comprises threephase current transformer (1), three-phase anti-parallel thyristor (2), first operational amplifier (3), pulse transforming trigger (4), second operational amplifier (5), the 3rd operational amplifier (6), microprocessor (7), LCD (8), single-chip microcomputer (9), keyboard (10); Three-phase alternating current also is connected with three voltage detecting inputs of first operational amplifier (3) respectively through three inputs that threephase current transformer (1) connects three-phase anti-parallel thyristor (2) respectively, three outputs of three-phase anti-parallel thyristor (2) connect three inputs of motor (11) respectively and are connected with three voltage detecting inputs of second operational amplifier (5) respectively, the 4th signal output part of threephase current transformer (1) connects the signal input part of the 3rd operational amplifier (6), the current signal that the signal output part of the 3rd operational amplifier (6) connects microprocessor (7) detects input, the voltage signal that the signal output part of first operational amplifier (3) connects microprocessor (7) detects input, another voltage signal that the signal output part of second operational amplifier (5) connects microprocessor (7) detects input, the control signal output ends of microprocessor (7) connects the signal input part of pulse transforming trigger (4), the signal output part of pulse transforming trigger (4) connects the signal input end of three-phase anti-parallel thyristor (2), the data input/output terminal of microprocessor (7) connects the data I/O of single-chip microcomputer (9), the shows signal output of single-chip microcomputer (9) connects the signal input part of LCD (8), and the output of keyboard (10) connects the signal input part of single-chip microcomputer (9).
2, Exchange Asynchronous Motor Dispersed Frequency Conversion Start-Up Method is characterized in that the program running step is: program initialization (01), detect initial afterflow angle (02), and the trigger angle that each discrete frequency conversion frequency is set makes minimum trigger angle greater than initial afterflow angle (03); Move 16 frequency divisions and trigger subprogram, be 0.32 second (04) its running time, and it is 32 that the one-period of the frequency 3.125Hz correspondence of 16 frequency divisions triggering subprogram comprises the number of power frequency half period, weaves into 32 groups; One, triggers the 1st, 3,5,7,9,11,13,15,17 group an of phase wherein, constitute the positive half cycle of 16 frequency division voltages; Trigger the 18th, 20,22,24,26,28,30,32 group, constitute the negative half period of 16 frequency division voltages, control the trigger angle of each group respectively and spend between 150 degree 30, and by the afterflow angle decision of electric current after voltage over zero; Two, control the trigger angle of each group according to the sinusoidal rule of equivalence, make its effective value approach the sine value of this group, trigger angle is big more, and effective value is more little; Be 56 when spending at initial afterflow angle, the trigger angle of respectively organizing in the 16 frequency division voltage positive half periods is followed successively by: 110 degree, 100 degree, 90 degree, 60 degree, 60 degree, 90 degree, 90 degree, 100 degree, 110 degree, and the trigger angle of respectively organizing in the negative half-cycle is followed successively by: 110 degree, 100 degree, 90 degree, 60 degree, 60 degree, 90 degree, 90 degree, 100 degree; Wherein minimum trigger angle also is greater than initial afterflow angle; Two-phase is handled equally in addition; Move 13 frequency divisions and trigger subprogram, be 0.26 second (05) its running time, and it is 26 that the one-period of the frequency 3.8Hz correspondence of 13 frequency divisions triggering subprogram comprises the number of power frequency half period, weaves into 26 groups; One, triggers the 1st, 3,5,7,9,11,13 group an of phase wherein, constitute the positive half cycle of 13 frequency division voltages; Trigger the 14th, 16,18,20,22,24,26 group, constitute the negative half period of 13 frequency division voltages, control the trigger angle of each group respectively and spend between 150 degree 30, and by the afterflow angle decision of electric current after voltage over zero; Two, control the trigger angle of each group according to the sinusoidal rule of equivalence, make its effective value approach the sine value of this group, trigger angle is big more, and effective value is more little; The trigger angle of respectively organizing in the 13 frequency division voltage positive half periods is followed successively by: 100 degree, 80 degree, 80 degree, 80 degree, 80 degree, 80 degree, 100 degree, and negative half period is identical with the trigger angle of positive half cycle; Two-phase is handled equally in addition; Move 10 frequency divisions and trigger subprogram, be 0.20 second (06) its running time, and it is 20 that the one-period of the frequency 5Hz correspondence of 10 frequency divisions triggering subprogram comprises the number of power frequency half period, weaves into 20 groups; One, triggers the 1st, 3,5,7,9,11 group an of phase wherein, constitute the positive half cycle of 10 frequency division voltages; Trigger the 12nd, 14,16,18,20 group, constitute the negative half period of 10 frequency division voltages, control the trigger angle of each group respectively and spend between 150 degree 30, and by the afterflow angle decision of electric current after voltage over zero; Two, control the trigger angle of each group according to the sinusoidal rule of equivalence, make its effective value approach the sine value of this group, trigger angle is big more, and effective value is more little; The trigger angle of respectively organizing in the 10 frequency division voltage positive half periods is followed successively by: 100 degree, 80 degree, 80 degree, 80 degree, 80 degree, 100 degree, and negative half period is identical with the trigger angle of positive half cycle; Two-phase is handled equally in addition; Move 7 frequency divisions and trigger subprogram, be 0.28 second (07) its running time, and it is 14 that the one-period of the frequency 7.1Hz correspondence of 7 frequency divisions triggering subprogram comprises the number of power frequency half period, weaves into 14 groups; One, triggers the 1st, 3,5,7 group an of phase wherein, constitute the positive half cycle of 7 frequency division voltages; Trigger the 8th, 10,12,14 group, constitute the negative half period of 7 frequency division voltages, control the trigger angle of each group respectively and spend between 150 degree 30, and by the afterflow angle decision of electric current after voltage over zero; Two, control the trigger angle of each group according to the sinusoidal rule of equivalence, make its effective value approach the sine value of this group, trigger angle is big more, and effective value is more little; The trigger angle of respectively organizing in the 7 frequency division voltage positive half periods is followed successively by: 100 degree, 75 degree, 75,100 degree, and negative half period is identical with the trigger angle of positive half cycle; Two-phase is handled equally in addition; Move 4 frequency divisions and trigger subprogram, be 0.4 second (08) its running time, and it is 8 that the one-period of the frequency 12.5Hz correspondence of 4 frequency divisions triggering subprogram comprises the number of power frequency half period, weaves into 8 groups; One, triggers the 1st, 3,5 group an of phase wherein, constitute the positive half cycle of 7 frequency division voltages; Trigger the 6th, 8 group, constitute the negative half period of 7 frequency division voltages, control the trigger angle of each group respectively and spend between 150 degree 30, and by the afterflow angle decision of electric current after voltage over zero; Two, control the trigger angle of each group according to the sinusoidal rule of equivalence, make its effective value approach the sine value of this group, trigger angle is big more, and effective value is more little; The trigger angle of respectively organizing in the 4 frequency division voltage positive half periods is followed successively by: 65 degree, 63 degree, 110 degree, negative half period trigger angle are followed successively by 63 degree, 65 degree; Two-phase is handled equally in addition; Soft start subprogram (09).
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| WO2008014681A1 (en) * | 2006-07-26 | 2008-02-07 | Liaoning Rongxin Power Electronic Co., Ltd. | Discrete frequency soft starting method and its device for an electric machine |
| CN102255518A (en) * | 2011-05-27 | 2011-11-23 | 山东华特磁电科技股份有限公司 | Frequency conversion method of non-ferrous metal electromagnetic stirrer and frequency conversion device for realizing frequency conversion method |
| CN102368675A (en) * | 2011-10-17 | 2012-03-07 | 南京南瑞继保电气有限公司 | Dual-mode control method for initial frequency conversion starting stage of synchronous motor |
| CN103199768A (en) * | 2013-04-15 | 2013-07-10 | 刘宁 | Alternating current asynchronous motor stepped variable frequency starting method and controller |
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| CN103199768A (en) * | 2013-04-15 | 2013-07-10 | 刘宁 | Alternating current asynchronous motor stepped variable frequency starting method and controller |
| 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 |
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| 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 |
| CN109347372A (en) * | 2017-07-04 | 2019-02-15 | 迈来芯保加利亚有限公司 | Commutation control based on current sense |
| CN109347372B (en) * | 2017-07-04 | 2021-02-19 | 迈来芯保加利亚有限公司 | Commutation control based on current sensing |
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| CN111244897B (en) * | 2018-11-28 | 2022-09-13 | 安徽美芝精密制造有限公司 | Detection method, detection device, motor and storage medium |
| CN114421825A (en) * | 2022-01-18 | 2022-04-29 | 浙江智海化工设备工程有限公司 | Logic control method and storage medium for series autotransformer starting motor |
| CN114421825B (en) * | 2022-01-18 | 2024-02-23 | 盈德气体工程(浙江)有限公司 | Logic control method and storage medium for series autotransformer starting motor |
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