CN2582244Y - power-saving protector for three-phase asynchronous motor - Google Patents
power-saving protector for three-phase asynchronous motor Download PDFInfo
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- CN2582244Y CN2582244Y CN 02277690 CN02277690U CN2582244Y CN 2582244 Y CN2582244 Y CN 2582244Y CN 02277690 CN02277690 CN 02277690 CN 02277690 U CN02277690 U CN 02277690U CN 2582244 Y CN2582244 Y CN 2582244Y
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- 230000001012 protector Effects 0.000 title 1
- 238000007493 shaping process Methods 0.000 claims abstract description 17
- 238000005070 sampling Methods 0.000 claims abstract description 16
- 230000001360 synchronised effect Effects 0.000 claims abstract description 14
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 13
- 239000010703 silicon Substances 0.000 claims abstract description 13
- 230000008878 coupling Effects 0.000 claims abstract description 7
- 238000010168 coupling process Methods 0.000 claims abstract description 7
- 238000005859 coupling reaction Methods 0.000 claims abstract description 7
- 230000003287 optical effect Effects 0.000 claims abstract description 6
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 3
- 238000002955 isolation Methods 0.000 claims abstract description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
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- 230000003068 static effect Effects 0.000 claims description 2
- 230000001960 triggered effect Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 238000004377 microelectronic Methods 0.000 abstract description 2
- 238000003786 synthesis reaction Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 208000033999 Device damage Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
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- 238000004134 energy conservation Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of electronics, especially indicate the economize on electricity and the protection device of three-phase motor among industry and the civil mechanical equipment. The utility model discloses electric signal sampling is connected with the major loop and current sampling is taken through three mutual inductors, current synchronous sampling is taken through three synchronous transformers, voltage sampling is taken from the three-phase major loop and enters the control circuit through optical coupling isolation; the square wave shaping part is used for connecting a sampling signal with the phase comparison part; the phase comparison part is connected with the square wave shaping part; the load tracking part is connected with the phase comparison part; the control signal synthesis part is connected with the load tracking part; the device adopts micro-electronics to track and monitor the load change in time and dynamically adjust the conduction angle of the controlled silicon, automatically track and monitor the load change condition of the motor, and adjust the electric quantity needed by the motor in time, so that the motor is always in the most economic running state, thereby achieving the purpose of high efficiency and electricity saving in the real sense;
Description
Technical field
The utility model relates to electronic technology field, refers in particular to the economize on electricity and the protective device of the threephase motor in industry and the civilian plant equipment.
Background technology
At present, in the plant equipment of all trades and professions, this transmission device of widespread usage threephase asynchronous, and nearly all plant equipment is when the configuration motor, all fibrous root is according to the peak load apolegamy motor of plant equipment, and power of electric motor configuration left certain surplus, to satisfy the maximum load demand of plant equipment in running.On the other hand, plant equipment is in running, and generally not for moving under constant load (except pump, the blower fan etc.) or non-full load and the weight alternate load operating mode, this has just produced suitable energy loss, has wasted a large amount of electric energy.The operation characteristic of motor is 5～7 times that starting current is generally rated current in addition, and the impact of immediate current is big to the influence of electrical network.
There is a kind of threephase motor to protect electricity-saving appliance (China Patent No.: CN93244642.6) automatically in the prior art; it is by the current transformer on the phase line that is connected in the three phase mains, overload, open-phase protection circuit and Y/ Δ change-over circuit; above-mentioned current transformer can provide sampled signal; and this sampled signal delivered to protective circuit and Y/ Δ change-over circuit; and then realize the protection and the Y/ Δ of motor are changed, reach the purpose of safety electricity-saving.
The shortcoming of above technology is, because the sampling of monophase current instrument transformer, taking a sample has limitation, though the automatic follow load of energy, when the electrical network three-phase imbalance, the control signal error is bigger, is easy to generate misoperation; In addition, load is adopted the fixed point control mode from motion tracking, can not control, adjust the running load of motor at any time automatically; Add Y/ Δ conversion employing relay, ac contactor contact contact-type control mode, mechanical wear is big, and is fragile, causes the shortcoming that useful life is short.Particularly when the not detected phase line phase failure, can not send instruction immediately, and in moment stoppage protection.Be again, it is big that this device does not solve the motor start-up electric current, during startup to the impact of electrical network, so that influence the problem of the operate as normal of other equipment.
Summary of the invention
The purpose of this utility model is improved at shortcoming that exists in the background technology and problem; a kind of threephase asynchronous electricity-saving protection device is provided; can realize the energy-conservation efficiently in good time purpose in the threephase asynchronous running; can better carry out reliably protecting to threephase asynchronous again, and the functions such as soft start control that realize threephase asynchronous.
The technical solution of the utility model realizes by following structure: the utility model includes: the motor voltage test section; the motor current test section; the synchronizing signal sampling part; the square wave shaping unit; the phase discriminator part; the load tracking part; the control signal composite part; the high frequency signal generator part; power amplifying part; the flip and flop generator part; constant current soft start part; the open-phase protection part; the overload protection part; the electric current limit for tonnage is close to the road part; operation and fault display part; body partly waits composition.Wherein signal of telecommunication sampling be connected with major loop and current sample by three instrument transformers take, the electric current synchronized sampling by three synchrotrans take, voltage sample takes from the three-phase major loop and enters control circuit through the optical coupling isolation; Described square wave shaping unit is that sampled signal is connected with the phase place rating unit; Described phase place rating unit is connected with the square wave shaping unit; Described load tracking part is connected with the phase place rating unit; Described control signal composite part partly is connected with load tracking; Described high frequency signal generator part is connected with control signal is synthetic; Described power amplifying part partly is connected with high frequency signal generator; Described power amplifying part is connected with silicon controlled module; Described silicon controlled module is connected with major loop; Described current sample part is connected with the motor major loop; Described motor protection part partly is connected with current sample; Described motor protection part partly is connected with high frequency signal generator; Described electric current limit for tonnage is close to the road part and partly is connected with load tracking; Described operation and fault display part are connected with motor protection, power amplification, power unit;
The utility model further includes: the starting current multiplying power limit regulator part in the constant current soft start part (its circuit connection is included among the constant current soft starting circuit); Protection time limit in the overload protection part and current setting parameter setting part (its circuit be connected be included among the overload protecting circuit);
It is adjustable that the described overload protection time limit is controlled to be 5～45S, and the overload protection current setting is 80～200% adjustable;
It is adjustable that the described constant current soft start time limit is controlled to be 0～240S, and it is adjustable that starting current is controlled at 1.5～4.5 times of rated current;
Described motor dynamic responding speed is that 0.025～2S is adjustable;
The utility model has the following advantages compared with prior art:
1, the startup function is good: owing to adopted the constant current soft Starting Technology, starting current when making motor start-up can be controlled between 0.8～4.5 times, avoided the startup impulse current, realize that level and smooth, electrodeless motor quickens to start, thereby alleviated the burden of enterprises electrical network, greatly reduced enterprise the provide and deliver input cost and the power supply cost of electric facility;
2, power savings is remarkable: this device adopts the in good time tracing and monitoring load variations of microelectronics, dynamically adjusts the thyristor operating angle size, the load variations situation of automatic tracking, monitoring motor, adjust in good time and supply with the required electric weight of motor, make motor be in most economical running status all the time, thereby reached the purpose of efficient electricity-saving in real meaning;
3, prolong the life-span of motor: owing to reduced operating current, thus reduced the working temperature of motor, reduced the wearing and tearing of motor, prolonged the useful life of motor;
4, safe and reliable to operation: as owing to realized integrated kinds of protect function (self temperature protection, phase shortage, overload/overcurrent, under-voltage/defencive functions such as overvoltage), to make that motor is unlikely to be burnt, avoid the generation of device damage even accident;
5, reduced operating cost: owing to adopted the high-power silicon controlled rectifier module, it is contactless auto switching defencive function makes the electric device loss be reduced to bottom line, has not only saved spending but also has saved the trouble of frequent replacing electric device;
6, adaptation (general) property is strong: the various plant equipment that are widely used in owing to threephase asynchronous make this device have use value widely.(as dustproof, waterproof, anticorrosion gas etc.) are when using, just as long as handle applicable a little under special operation condition.On the other hand, it is adapted to the electromechanical equipment that moves under the various operating mode, as according to starting device under the different loads, adjusts its soft-start time length, during shock load, adjusts current-limiting protection value and guard time etc. in limited time;
7, be easy to management and use: because multiple functional, technology is perfect, so do not need external auxiliary.Be that this device is directly installed on the major loop again, very convenient.In case after Installation and Debugging are good, need not personnel nurse, carry out self-servo fully.
Principle of the present utility model is: signal of telecommunication sampling, wherein comprise current sample, electric current synchronized sampling, voltage sample, mainly be achieved as follows function respectively: current sample is taked three-phase current signal by three instrument transformers, relatively control by the signal of telecommunication, reach each defencive function of motor (phase shortage, overload), soft start controlled function and be close to the purpose of road function automatically; The electric current synchronized sampling is taked three-phase synchronizing current signal by three synchrotrans, forms the square wave signal of telecommunication by shaping, carries out bit comparison mutually with the voltage square wave signal of telecommunication again, thereby realizes the in good time load tracking control in the motor operation course; Voltage sample is taken from the three-phase major loop and is taked three-phase voltage signal, isolate shaping by optical coupling and form the square wave signal of telecommunication, one the tunnel with the shaping of electric current synchronized sampling after the square wave signal of telecommunication carry out bit comparison mutually, realize the in good time load tracking control in the motor operation course, another road is by forming and the synchronous sawtooth signal of voltage after the differential integral processing, through the logical process of control signal composite part, realize control, adjust silicon controlled module angle of flow size, reach the purpose of dynamic economize on electricity.
Execution mode of the present utility model is provided by the following drawings:
Description of drawings
Fig. 1 is the utility model block diagram
Fig. 2 is the utility model electrical schematic diagram
Embodiment
1: form with the sawtooth waveforms of power supply homophase
Photoelectricity coupling plate: the 380V sinusoidal ac, through the step-down of 5W/220K resistance, the diode amplitude limit is delivered to 17324 and is carried out the shaping amplification, by the optical coupling device, isolates output and the synchronous square-wave signal of 380V alternating current, is connected to G
1, G
2, G
3
G
1Square-wave signal through C
1, R
7Connect N
1(324) carry out shaping once more and amplify, from N
11,7 pin output, connect C
7, C
8, R
25, R
26Differential is at N
46 pin on form a polarity and be negative needle-like pulse, N
4Static voltage ratio 6 pin of setting of 5 pin low, output pin 7 static state are low-voltage, at N
4The effect of the negative needle-like pulse of 6 pin under, 7 pin occur and the corresponding positive pulse of needle-like pulse, through C
13, R
57Discharge and recharge at C
13Last formation and the synchronous negative sawtooth waveforms of power supply.
2: phase demodulation (forming) with the proportional voltage of power factor
G
1The pin signal is and the square wave of power supply homophase that what synchrotrans B obtained is and the synchronous sine wave of current of electric that these two signals are through N
1Shaping is at N
17,1,8,14 pin output, pass through R again
13, R
14, R
15, R
16Synthesize V
9, V
10Synthetic once more through R
32Export a voltage signal.Work as G
1During the signal same-phase that obtains with B, R
32Output signal be zero, G
1, the B signal the phase phasic difference big more, R
32The signal of output is big more, thereby the phase relation of electric current and voltage is transformed into voltage signal.
3: SCR control signal synthetic
The negative sawtooth waveforms identical with power supply, the voltage signal of reaction power factor is respectively from N
49 pin and 10 pin inputs, through N
4Relatively, at square-wave signal of 8 pin output, the square wave starting point is the joint of power factor line and sawtooth waveforms hypotenuse, and stop is the power supply zero crossing.Square-wave signal passes through V as a switching signal
25Control C
1The break-make of 008 base stage 7KHZ high-frequency signal, this is subjected to the high-frequency signal of square wave signal controlling, through C
1008 (3DG130B), BV806 (1073) amplify, and pulse transformer is isolated the back and triggered controllable silicon.
4: open-phase protection
LH
3Induced current on the instrument transformer is through R
172Become voltage, through diode rectification R
92, C
17Filtering forms a negative voltage and is added to N
62 pin, N
63 pin be predisposed to about-0.1 N during operate as normal
6Voltage ratio 3 pin of 2 pin low, 1 pin output high potential, when the motor phase shortage, the voltage on the instrument transformer is zero, N
62 pin voltage ratios, 3 pin low, 1 pin output electronegative potential makes C
1The 7KHZ high-frequency signal of 008 (3DG130B) base stage is cut off, and controllable silicon turn-offs.
5: soft start
Instrument transformer, diode R
110, N
76,7 pin, N
73,1 pin, N
82,1 pin, R
155, V
56, R
70Form a close loop control circuit, when starting current increases N
76 pin voltages reduce, 7 pin voltages raise, 3 pin voltages raise, when being higher than the set point of 2 pin, 1 pin voltage raises, N
81 pin voltage reduce, thyristor operating angle reduces, electric moter voltage reduces, and starting current is remained on the set point.
6: overload protection
Instrument transformer, diode, R
128, N
712 pin, N
810 pin, V
56Form a close loop control circuit, when operating current increases N
712 pin voltages descend, when being lower than N
7The set point of 13 pin the time, N
714 pin be low-voltage, N
88 pin be low-voltage, controllable silicon turn-offs, the motor outage.
7: starting state (the automatic conversion of operating state)
N
9, N
11Form a flip and flop generator, work as N
910,13 pin voltages be lower than N
912 pin the time, N
914 pin be high voltage, N
1110 pin be low-voltage, and pass through V
49, V
50Close the overload protection loop, N
91 pin be high voltage, close the power factor loop, circuit is in starting state.Behind electric motor starting, N
910,13 pin voltages raise, exceed N
99 pin voltages the time, flip-flop circuit upset, N
91 pin be low-voltage, pass through V
60Close and start loop, N
1110 pin be high voltage, electricity-saving appliance enters operating state.
8: switching on and shutting down
N during shutdown
105 pin be electronegative potential, N
107 pin be electronegative potential also, through V
43Close thyristor gating circuit.
N during start
105 pin be high potential, N
107 pin be high potential, through V
43, thyristor gating circuit is started working.
9: operation and fault show
Operation, fault adopt LED to show.
Open-phase protection shows: when normal operation, and open-phase protection indicator light H
4Do not work, when the arbitrary phase phase failure of A, B, C three-phase, H is lighted in the protective circuit action
4
Overload protection shows: overload protection indicator light H when normal operation
5Do not work, when current value of surpass setting when running load and overload time surpassed setting-up time, H was lighted in the protection action
5
Operation shows: three run indicator (HA, HB, HC) are all lighted when normal operation, and when wherein any one when mutually out of service, corresponding indicator light will extinguish.
10: the other technologies explanation
W
1: the starting current adjustment: clockwise direction increases.According to the actual conditions adjustment, guarantee electronic function normal starting.
W
2: the minimum out-of-step free voltage adjustment of motor: increase clockwise (about about 80V).
W
3: the motor minimum is adjusted: increase (than about the high 30V of minimum out-of-step free voltage clockwise.)
W
4: the impact load sensitivity adjustment: sensitivity increases clockwise.Guaranteeing electronic opportunity impact load not under the preceding topic of stall, sensitivity is low more good more.
W
5: the overload protection electric current is adjusted: increase clockwise (generally big by 10% than rated current, when the set condition of 10KW, transfer W
5Make N
713 pin be-2V, this moment protective current be about 14A.)
W
6: the overload protection delay time is adjusted: be transferred to the end clockwise and delayed time approximately for 5 seconds, be transferred to the end counterclockwise and delayed time approximately for 45 seconds.
W
7: the intensity adjustment of positive feedback: can change the speed that voltage descends.
W
8: readiness voltage is set: adjust W
8Make W
913 pin than the low 0.5V of 12 pin (13 pin are about 9.5V), this moment electricity-saving appliance be in starting state.
H
5: be the overload protection indicator light.
H
4: be the open-phase protection indicator light.
H
1, H
2, H
3: for controllable silicon triggers indicator light
Claims (7)
1, a kind of threephase asynchronous electricity-saving protection device, comprise the motor voltage test section, the motor current test section, the synchronizing signal sampling part, the square wave shaping unit, the phase discriminator part, the load tracking part, the control signal composite part, the high frequency signal generator part, power amplifying part, the flip and flop generator part, constant current soft start part, the open-phase protection part, the overload protection part, the electric current limit for tonnage is close to the road part, operation and fault display part, the body part is characterized in that wherein signal of telecommunication sampling is connected with major loop and current sample is taked by three instrument transformers, the electric current synchronized sampling is taked by three synchrotrans, voltage sample is taken from the three-phase major loop and is entered control circuit through the optical coupling isolation; Described square wave shaping unit is that sampled signal is connected with the phase place rating unit; Described phase place rating unit is connected with the square wave shaping unit; Described load tracking part is connected with the phase place rating unit; Described control signal composite part partly is connected with load tracking; Described high frequency signal generator part is connected with control signal is synthetic; Described power amplifying part partly is connected with high frequency signal generator; Described power amplifying part is connected with silicon controlled module; Described silicon controlled module is connected with major loop; Described current sample part is connected with the motor major loop; Described motor protection part partly is connected with current sample; Described motor protection part partly is connected with high frequency signal generator; Described electric current limit for tonnage is close to the road part and partly is connected with load tracking; Described operation and fault display part are connected with motor protection, power amplification, power unit.
2, threephase asynchronous electricity-saving protection device according to claim 1; it is characterized in that 380V sinusoidal ac in the power circuit; through the step-down of 5W/220K resistance; the diode amplitude limit is delivered to 17324 and is carried out the shaping amplification; by the optical coupling device; isolate output and the synchronous square-wave signal of 380V alternating current, be connected to G
1, G
2, G
3, G
1Square-wave signal through C
1, R
7Connect N
1(324) carry out shaping once more and amplify, from N
11,7 pin output, connect C
7, C
8, R
25, R
26Differential is at N
46 pin on form a polarity and be negative needle-like pulse, N
4Static voltage ratio 6 pin of setting of 5 pin low, output pin 7 static state are low-voltage, at N
4The effect of the negative needle-like pulse of 6 pin under, 7 pin occur and the corresponding positive pulse of needle-like pulse, through C
13, R
57Discharge and recharge at C
13Last formation and the synchronous negative sawtooth waveforms of power supply.
3, threephase asynchronous electricity-saving protection device according to claim 1 is characterized in that described phase discriminator part G
1The pin signal is and the square wave of power supply homophase that what synchrotrans B obtained is and the synchronous sine wave of current of electric that these two signals are through N
1Shaping is at N
17,1,8,14 pin output, pass through R again
13, R
14, R
15, R
16Synthesize V
9, V
10Synthetic once more through R
32Export a voltage signal, work as G
1During the signal same-phase that obtains with B, R
32Output signal be zero, G
1, the B signal the phase phasic difference big more, R
32The signal of output is big more, thereby the phase relation of electric current and voltage is transformed into voltage signal.
4, threephase asynchronous electricity-saving protection device according to claim 1 is characterized in that the negative sawtooth waveforms that described control signal composite part is wherein identical with power supply, and the voltage signal of reaction power factor is respectively from N
49 pin and 10 pin inputs, through N
4Relatively, at square-wave signal of 8 pin output, the square wave starting point is the joint of power factor line and sawtooth waveforms hypotenuse, and stop is the power supply zero crossing, and square-wave signal passes through V as a switching signal
25Control C
1The break-make of 008 base stage 7KHZ high-frequency signal, this is subjected to the high-frequency signal of square wave signal controlling, through C
1008 (3DG130B), BV806 (1073) amplify, and pulse transformer is isolated the back and triggered controllable silicon.
5, threephase asynchronous electricity-saving protection device according to claim 1 is characterized in that described open-phase protection part, wherein LH
3Induced current on the instrument transformer is through R
172Become voltage, through diode rectification R
92, C
17Filtering forms a negative voltage and is added to N
62 pin, N
63 pin be predisposed to about-0.1 N during operate as normal
6Voltage ratio 3 pin of 2 pin low, 1 pin output high potential.
6, threephase asynchronous electricity-saving protection device according to claim 1 is characterized in that described soft start part wherein instrument transformer, diode R
110, N
76,7 pin, N
73,1 pin, N
82,1 pin, R
155, V
56, R
70Form a close loop control circuit, when starting current increases N
76 pin voltages reduce, 7 pin voltages raise, 3 pin voltages raise, when being higher than the set point of 2 pin, 1 pin voltage raises, N
81 pin voltage reduce, thyristor operating angle reduces, electric moter voltage reduces, and starting current is remained on the set point.
7, threephase asynchronous electricity-saving protection device according to claim 1 is characterized in that described overload protection part wherein instrument transformer, diode, R
128, N
712 pin, N
810 pin, V
56Form a close loop control circuit, when operating current increases N
712 pin voltages descend, when being lower than N
7The set point of 13 pin the time, N
714 pin be low-voltage, N
88 pin be low-voltage, controllable silicon turn-offs, the motor outage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02277690 CN2582244Y (en) | 2002-11-15 | 2002-11-15 | power-saving protector for three-phase asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02277690 CN2582244Y (en) | 2002-11-15 | 2002-11-15 | power-saving protector for three-phase asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2582244Y true CN2582244Y (en) | 2003-10-22 |
Family
ID=33741223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02277690 Expired - Fee Related CN2582244Y (en) | 2002-11-15 | 2002-11-15 | power-saving protector for three-phase asynchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2582244Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707468A (en) * | 2009-12-07 | 2010-05-12 | 黄金亮 | Automatic voltage regulator for generator |
| CN104917424A (en) * | 2015-05-26 | 2015-09-16 | 深圳市英威腾电气股份有限公司 | Motor internal contracting brake control system of construction elevator |
| CN105144565A (en) * | 2013-02-20 | 2015-12-09 | Trw有限公司 | Motor control circuit and method of monitoring motor |
-
2002
- 2002-11-15 CN CN 02277690 patent/CN2582244Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101707468A (en) * | 2009-12-07 | 2010-05-12 | 黄金亮 | Automatic voltage regulator for generator |
| CN101707468B (en) * | 2009-12-07 | 2013-02-13 | 黄金亮 | Automatic voltage regulator for generator |
| CN105144565A (en) * | 2013-02-20 | 2015-12-09 | Trw有限公司 | Motor control circuit and method of monitoring motor |
| CN105144565B (en) * | 2013-02-20 | 2017-12-29 | Trw有限公司 | The method of circuit for controlling motor and monitoring motor |
| CN104917424A (en) * | 2015-05-26 | 2015-09-16 | 深圳市英威腾电气股份有限公司 | Motor internal contracting brake control system of construction elevator |
| CN104917424B (en) * | 2015-05-26 | 2018-05-22 | 深圳市英威腾电气股份有限公司 | A kind of motor internal contracting brake control system of building hoist |
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