CN105356509A - Lifting machinery matrix type energy feedback transmission system - Google Patents

Lifting machinery matrix type energy feedback transmission system Download PDF

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Publication number
CN105356509A
CN105356509A CN201510887464.3A CN201510887464A CN105356509A CN 105356509 A CN105356509 A CN 105356509A CN 201510887464 A CN201510887464 A CN 201510887464A CN 105356509 A CN105356509 A CN 105356509A
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CN
China
Prior art keywords
frequency converter
energy feedback
variable
hoisting machinery
decelerator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510887464.3A
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Chinese (zh)
Inventor
张煜明
厉红娅
王传民
吴燕明
揭建安
刘娴
杨娟丽
杨欣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MINISTRY OF WATER RESOURCES PRODUCT QUALITY STANDARD RESEARCH INSTITUTE
HANGZHOU JIANGHE ELECTROMECHANICAL EQUIPMENT ENGINEERING Co Ltd
China International Water and Electric Corp
Original Assignee
MINISTRY OF WATER RESOURCES PRODUCT QUALITY STANDARD RESEARCH INSTITUTE
HANGZHOU JIANGHE ELECTROMECHANICAL EQUIPMENT ENGINEERING Co Ltd
China International Water and Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MINISTRY OF WATER RESOURCES PRODUCT QUALITY STANDARD RESEARCH INSTITUTE, HANGZHOU JIANGHE ELECTROMECHANICAL EQUIPMENT ENGINEERING Co Ltd, China International Water and Electric Corp filed Critical MINISTRY OF WATER RESOURCES PRODUCT QUALITY STANDARD RESEARCH INSTITUTE
Priority to CN201510887464.3A priority Critical patent/CN105356509A/en
Publication of CN105356509A publication Critical patent/CN105356509A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00Other constructional features or details
    • B66C13/12Arrangements of means for transmitting pneumatic, hydraulic, or electric power to movable parts of devices
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P5/00Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H02P5/46Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2207/00Indexing scheme relating to controlling arrangements characterised by the type of motor
    • H02P2207/01Asynchronous machines

Abstract

The invention discloses a lifting machinery matrix type energy feedback transmission system. The system comprises a lifting machinery mechanism. The lifting machinery mechanism comprises a linkage operating console, a programmable controller, a frequency converter, a variable frequency motor, an overspeed switch, an encoder, a brake, a decelerator, a lifting reel and a floating shaft, wherein the linkage operating console is connected with the frequency converter under its control through the programmable controller, the frequency converter is connected with the variable frequency motor driven thereby, the variable frequency motor is connected with the decelerator, the driving shaft of the decelerator is provided with the brake, the decelerator is connected with the lifting reel, the high-speed shaft of the variable frequency motor is provided with the encoder and the overspeed switch, the frequency converter is a frequency converter with a matrix type energy feedback technology, the frequency converter is connected with a power network, a built-in encoder interface card is connected with the encoder on the variable frequency motor to form a closed-loop control system, and when the variable frequency motor descend or brakes, energy is fed back to the power network via the frequency converter.

Description

Hoisting machinery matrix form energy feedback drive system
Technical field
The invention belongs to hoisting machinery drive technology field, relate to a kind of hoisting machinery matrix form energy feedback drive system.
Background technology
Energy-saving and emission-reduction have become the common recognition in world today's industrial production life, and the energy utilization situation of China allows of no optimist, and the energy consumption of per GDP is 6 times of the U.S., are 7 times of Japan, or even 2.8 of India times; Environmental protection and CO2 emission face huge pressure; China hoisting machinery have more than 400 ten thousand covers, substantially do not adopt energy conserving system or device, its energy utilization rate is less than 30%.Contrast the external state of the art, there are energy conserving system in European Union, particularly Germany on universal crane, and its energy consumption is less than 50% of China's like product; For current prevailing AC-DC-AC type PWM Variable Frequency Drives, due to containing bulky capacitor or large inductance as energy-storage travelling wave tube, volume is large, Heavy Weight, cause converter plant installation and the inconvenience used, be not easy to safeguard, the volatilization of the electrolyte of especially large electrochemical capacitor, has had a strong impact on the useful life of frequency converter; Secondly, the rectification side of most of AC-DC-AC converter adopts diode full-bridge rectification, makes input side power factor lower, serious to harmonic pollution in electric power net.
Summary of the invention
The invention provides that a kind of structure is simple, reliability is high, stable, safety, the hoisting machinery matrix form energy feedback drive system without electrically polluting can be realized again, can realize, when crane declines and brakes, the renewable energy resources consumed in brake resistance are all returned power supply, and without the drive system that high order harmonic component produces.
The technical solution used in the present invention is:
Hoisting machinery matrix form energy feedback drive system, comprise hoisting machinery mechanism, described hoisting machinery mechanism comprises combined operation platform, programmable controller, frequency converter, variable-frequency motor, overspeed switch, encoder, brake, decelerator, hoisting drum, floating axle, described combined operation platform is connected with the frequency converter controlled by it by programmable controller, described frequency converter is connected with the variable-frequency motor driven by it, described variable-frequency motor is connected with decelerator, the driving shaft of described decelerator fills brake, described decelerator is connected with hoisting drum, the high speed shaft of described variable-frequency motor fills encoder and overspeed switch, it is characterized in that: described frequency converter is a frequency converter with matrix form energy feedback technology, described frequency converter is connected with electrical network, encoder on its built-in encoder interfaces card and variable-frequency motor connects and composes a closed-loop control system, when variable-frequency motor decline or braking procedure in through frequency converter by energy feedback to electrical network.The present invention is by being connected to form closed-loop control system by the encoder on frequency converter and variable-frequency motor; and adopt matrix form energy feedback technology; variable-frequency motor renewable energy resources consumed in brake resistance in decline or braking procedure are all fed back to electrical network by frequency converter, save the energy and protection of the environment.
Further, described variable-frequency electric function exports permanent torque in 5 ~ 50Hz period, and this torque is 52.3N.m.
Further, the closed-loop control system that described frequency converter and encoder connect and compose be a non-rectification without harmonic energy feedback control system, can not mains by harmonics be polluted.
Further, the three-phase alternating-current supply of described electrical network is connected with frequency converter by circuit breaker.
Further, described variable-frequency motor adopts closed-type cylindrical gearing mode, and by the first gear coupling connection reducer, described decelerator connects hoisting drum by the second gear coupling.
Further, the diameter of described hoisting drum is 420mm.
Further, described Programmable Logic Controller comprises CPU module, I/O digital module.
Further, described hoisting machinery mechanism has two covers, is rigidly connected between the reducer shaft of two mechanisms by gear coupling floating axle, thus it is synchronous to guarantee that Liang Tao hoisting machinery mechanism runs, and realizes the synchronous opening/closing of gate two suspension centre.
Further, the brake on the described decelerator of two mechanisms is all connected with the same A.C. contactor controlling it, to guarantee the net synchronization capability braking opening and closing.
Further, the described frequency converter of two mechanisms is master-slave control methods, thus realize two mechanisms go out dynamic balance.
Beneficial effect of the present invention: structure is simple, reliability is high, stable, safety, can realize again without electric contamination energy feedback.
Accompanying drawing explanation
Fig. 1 is mechanical assembly structure figure of the present invention.
Fig. 2 is functional schematic block diagram of the present invention.
Fig. 3 is the cut-away view of frequency converter of the present invention.
Fig. 4 is band-type brake Control timing sequence figure of the present invention.
Fig. 5 is that the present invention hoists electric drive figure.
Fig. 6 a, 6b are lift control schematic diagrams of the present invention.
Fig. 7 is PLC schematic diagram of the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention is further described, but does not limit the invention to these embodiments.One skilled in the art would recognize that all alternatives, improvement project and the equivalents that present invention encompasses and may comprise in Claims scope.
See Fig. 1,2, hoisting machinery matrix form energy feedback drive system, comprise hoisting machinery mechanism, described hoisting machinery mechanism comprises: in drivers' cab, in interlock operating desk 1, drivers' cab, model is siemens PLC programmable controller 2, frequency converter 3, variable-frequency motor 4, overspeed switch 5, encoder 6, brake 7, decelerator 8, hoisting drum 9, floating axle 10, forms complete matrix form energy feedback drive system.In drivers' cab, interlock operating desk 1 controls frequency converter 3 by programmable controller 2, there is the peace river frequency converter 3(CIMR-UB4R0021 of vector control function) drive variable-frequency motor 4(YZPF160M1-8, 4kW), motor adopts shaft coupling (NGCLZ3) to connect (QJRS-D335-200) decelerator 8, the driving shaft of decelerator is equipped with (YWZE-200/22) type brake 7, and adopt shaft coupling (NGCLZ3) connection diameter to be the hoisting drum device 9 of φ 420mm, decelerator 8 axle of the hoisting machinery mechanism that two cover left and right are identical is rigidly connected by gear coupling and floating axle 10.Encoder 6(HLE45-1024-3FA the high speed shaft of variable-frequency motor 4 is equipped with), connect and compose closed-loop control system with frequency converter 3 interface card (PG-B3), overspeed switch 5(LY1-1/750DZ is housed simultaneously).
The present embodiment speed index: rising or falling speed is 0.25 ~ 2.5m/min.Hoist and all adopt master controller to control, speed is decided by the gear of joint action table master controller, positive and negative each four gears, be respectively 10%, 30%, 60%, 100% normal speed, system adopts the main gear on-off amount that makes to input to PLC, after software process, then by PLC output switch amount signal to frequency converter.Speed gear can set arbitrarily, to meet friction speed requirement in frequency converter.
See Fig. 3, for the topology diagram of matrix form energy feedback frequency converter, it is three-phase-three-phase matrix converter, this circuit comprises 3X3 totally 9 bidirectional switchs, each bidirectional switch has the ability of two-way admittance and two-way shutoff, thus realize the two-way flow of energy, sinusoidal input and output electric current, controlled input power factor, power density is high, harmonic pollution is little.It is different from rectification type feedback device, because not needing middle rectification link, directly achieving AC-AC conversion, thus considerably reducing input current high order harmonic component, under 100% load, and input current THD<5%, efficiency of transmission is high; Can obtain sinusoidal wave input current and output voltage, waveform distortion is little; Input power factor can regulate arbitrarily between positive and negative, can not produce reactive power or play certain inactive power compensation to electrical network, and has nothing to do with the power-factor of load; Energy can bi-directional, is applicable to the alternating-current actuating system of four quadrant running; Control freedom degree is large.
There is see Fig. 4 the peace river frequency converter CIMR-UB4R0021 internal configurations encoder interfaces plate PG-B3 of matrix form energy feedback control technology, and by arranging high-resolution encoder HLE45-1024L-3FA on variable-frequency motor high speed shaft, form a closed-loop control system.Variable-frequency electric function at the reliable permanent torque 52.3N.m of 5 ~ 50Hz period stable output, decline or braking procedure in by frequency converter by energy feedback to electrical network.
The present embodiment variable-frequency motor adopts closed-type cylindrical gearing mode, is directly connected with middle hard gear-face decelerator QJRS-D335-200, middle hard gear-face decelerator transmission efficiency is high, smooth running, noise are low, bearing capacity is high, can meet low-loss requirement preferably.Middle hard gear-face decelerator QJRS-D335-200 is directly connected with reel, according to lift 12m and total reduction when wirerope diameter 14mm, as calculated: drum diameter is 420mm.
This example is the synchronous opening/closing ensureing gate two suspension centre; The decelerator QJRS-D335-200 of the hoisting machinery mechanism that two cover left and right are identical is rigidly connected by floating axle 10, thus guarantees that the two identical hoisting machinery mechanisms of cover run synchronous.On the driving shaft of two cover decelerators, YWZE-200/22 type brake is housed as service brake simultaneously, and is controlled by same A.C. contactor LC1-D09M7C, to guarantee the net synchronization capability braking opening and closing.
Characteristic due to asynchronous machine slippage determines when two motors drive a rigid load simultaneously, load can be there is and distribute uneven phenomenon, even a motor another machine operation in tow may be there is under light-load state when serious, a motor is in motoring condition, and a motor is in the situation of generating state.In order to avoid this situation, the Load Balanced of each suspension centre of hoist is distributed, and the frequency converter 3 of the hoisting machinery mechanism of this double-hanging point headstock gear adopts master-slave control method.
See Fig. 5, two frequency converters 3 all adopt closed-loop vector to control, primary transducer U21 makes speeds control, direct torque is made from frequency converter U22, two analog quantity FM of primary transducer U21, AM lead-out terminal is output frequency instruction and torque instruction respectively, frequency instruction 0 ~ 10V signal, torque instruction-10 ~+10V signal.Accept the FM terminal output signal of primary transducer as speed restriction from the A1 terminal of frequency converter U22, accept the AM terminal output signal of primary transducer U21 as torque instruction from the A3 terminal of frequency converter U22.In time starting working, primary transducer U21 driving load can produce an actual inside torque instruction, this torque instruction is exported to do direct torque from frequency converter U22, also an onesize torque can be exported from frequency converter U22, the torque that such two frequency converters export is the same, would not occur the phenomenon of load imbalance.The frequency instruction of primary transducer U21 is exported to and is limited as speed from frequency converter U22, is so just limited in the identical speed of service current with primary transducer U21 from the speed of frequency converter U22.
Torque for primary transducer U21 exports, due to 10V corresponding be 100% of Rated motor torque, but Driving Torque may exceed 100% of Rated motor torque when electric motor starting, so time cannot export more than 100% dtc signal, so need the torque instruction analog quantity AM terminal H4-05 output gain of primary transducer U21 to be set as 0.5, such 10V just can corresponding Rated motor torque 200%; For the input from frequency converter U22 torque, 100% of the corresponding Rated motor torque of factory-said value 10V, therefore the torque instruction of more than 100% Rated motor torque cannot be inputted, so need be 200% by the gain setting of the A3 terminal H3-07 from frequency converter U22, coordinate with the H4-05 terminal of primary transducer U21.In time having 10V to input corresponding be 200% torque.
Because torque is directive, so the torque lead-out terminal H4-08 of primary transducer U21 is set as 1, be set as 1 from the torque input command terminal H3-05 of frequency converter U22, namely corresponding signal is-10V ~+10V.
See Fig. 5, this figure is the electric drive figure that hoists.In figure, three-phase alternating current 380V50Hz power supply exports frequency converter U21 input to by circuit breaker Q F201, and U21 exports main lifting motor-M201 to.Three-phase alternating current 380V50Hz power supply is also connected with frequency converter U22 by circuit breaker Q F202 respectively successively, and U22 exports to from lifting motor-M202.
As shown in Figure 5, a peace river frequency converter CIMR-UB4R0021 with friendship-friendship energy feedback technology drives variable-frequency motor YZP160M1-8,4kW, it is by internal configurations encoder interfaces plate PG-B3, and with variable-frequency motor high speed shaft on high-resolution encoder HLE-10248L-3FA is set, constitute a closed-loop control system.For preventing from slipping the appearance of hook phenomenon, need overlap frequency converter build-in function block, opening mechanical brake moment to ensure that weight lifts by crane aloft, motor can export enough large detent torque, ensures that weight does not down slip, as shown in Figure 5, contact M1-M2 controls mechanical hatching gate, specific as follows:
As shown in Figure 4:
1) H2-01 is set to 37, what namely M1-M2 exported is 2 signals in running, with this signal controlling lifting mechanism band-type brake.
2) band-type brake is opened: parameter b2-01 is set as 0.1 ~ 0.5Hz usually, after the input of UP Setting signal, when frequency converter output frequency is raised to b2-01 value, now frequency converter has exported enough large electric current, motor is made to produce enough Driving Torque (>=nominal torque), now M1-M2 closes, and brake is opened, and can not produce and slip hook phenomenon.
3) band-type brake is closed: during UP Setting signal back to zero, when frequency converter output frequency is down to b2-01 value, now frequency converter Driving Torque also exists, and near below the 0.5Hz of speed, now M1-M2 2 to open in running, brake, and the existence of moment prevents from slipping the appearance of hook phenomenon, low speed band-type brake reduces the impact of mechanism simultaneously, reduces the wearing and tearing of brake.
Lift control schematic diagram see Fig. 6 a, 6b.In Fig. 6 a, PLC output point P206 is connected with overspeed protecting relay K206 normal opened contact; and be connected with the coil of brake KM21; PLC output point P207, P208, P209 and P210 are connected with coil KM22, KM23, KM24 and KM25 of motor fan, Oil pump electrical machinery, grasping beam cable drum and cabinet top fan contactor respectively, and other are protection contact and carry out signal conversion through auxiliary relay.Fig. 6 b is mainly the joint action table display of guard signal; relay K 203 is connected with the upper and lower spacing indicator light H203 that hoists with K204; relay K 221 is connected with grasping beam indicator light H205 in place; PLC output point P211 with P212 and grasping beam are worn and are moved back pin indicator light H206 and be connected; relay K 222 and the series connection of K225 normally opened contact, relay K 223 and the series connection of K226 normally opened contact are moved back the pin indicator light H207 that puts in place and are connected with wearing.
Fig. 7 is PLC schematic diagram.PLC is arranged on drivers' cab, and adopt S7-200 Programmable Logic Controller, it comprises CPU module and I/O digital module, and CPU module selects the module 6ES7288-1ST60-0AA0 that band 36 tunnel inputs and 24 tunnels export.I/O digital module is selected 16 tunnels to input 16 tunnels and is exported digital module; the main signal such as operation signal and super underload protection, aperture protection, height limit protection and overspeed protection that makes with cart operation that will hoist inputs to PLC input circuit; pass through software programming; export each mechanism and run control signal, thus realize the normal operation of each mechanism.

Claims (10)

1. hoisting machinery matrix form energy feedback drive system, comprise hoisting machinery mechanism, described hoisting machinery mechanism comprises combined operation platform, programmable controller, frequency converter, variable-frequency motor, overspeed switch, encoder, brake, decelerator, hoisting drum, floating axle, described combined operation platform is connected with the frequency converter controlled by it by programmable controller, described frequency converter is connected with the variable-frequency motor driven by it, described variable-frequency motor is connected with decelerator, the driving shaft of described decelerator fills brake, described decelerator is connected with hoisting drum, the high speed shaft of described variable-frequency motor fills encoder and overspeed switch, it is characterized in that: described frequency converter is a frequency converter with matrix form energy feedback technology, described frequency converter is connected with electrical network, encoder on its built-in encoder interfaces card and variable-frequency motor connects and composes a closed-loop control system, when variable-frequency motor decline or braking procedure in through frequency converter by energy feedback to electrical network.
2. hoisting machinery matrix form energy feedback drive system as claimed in claim 1, is characterized in that: described variable-frequency electric function exports permanent torque in 5 ~ 50Hz period.
3. hoisting machinery matrix form energy feedback drive system as claimed in claim 1, is characterized in that: the closed-loop control system that described frequency converter and encoder connect and compose is that a non-rectification is without harmonic energy feedback control system.
4. hoisting machinery matrix form energy feedback drive system as claimed in claim 1, is characterized in that: the three-phase alternating-current supply of described electrical network is connected with frequency converter by circuit breaker.
5. hoisting machinery matrix form energy feedback drive system as claimed in claim 1, it is characterized in that: described variable-frequency motor adopts closed-type cylindrical gearing mode, by the first gear coupling connection reducer, described decelerator connects hoisting drum by the second gear coupling.
6. hoisting machinery matrix form energy feedback drive system as claimed in claim 1, is characterized in that: the diameter of described hoisting drum is 420mm.
7. hoisting machinery matrix form energy feedback drive system as claimed in claim 1, is characterized in that: described Programmable Logic Controller comprises CPU module, I/O digital module.
8. the hoisting machinery matrix form energy feedback drive system as described in one of claim 1 ~ 7, is characterized in that: described hoisting machinery mechanism has two covers, is rigidly connected between the reducer shaft of two mechanisms by gear coupling floating axle.
9. hoisting machinery matrix form energy feedback drive system as claimed in claim 8, is characterized in that: the brake on the described decelerator of two mechanisms is all connected with the same A.C. contactor controlling it.
10. hoisting machinery matrix form energy feedback drive system as claimed in claim 1, is characterized in that: the described frequency converter of two mechanisms is master-slave control methods.
CN201510887464.3A 2015-12-07 2015-12-07 Lifting machinery matrix type energy feedback transmission system Pending CN105356509A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109264586A (en) * 2018-10-17 2019-01-25 南通航运职业技术学院 A kind of design method of harbor quayside crane energy feedback system
CN111181471A (en) * 2020-01-17 2020-05-19 深圳市英威腾电气股份有限公司 Multi-frequency converter equipment and master-slave control system and method of frequency converter of multi-frequency converter equipment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1503493A2 (en) * 2003-07-30 2005-02-02 Potain Control device for a brake resistor of a frequency converter
CN1725627A (en) * 2005-06-27 2006-01-25 广州日立电梯有限公司 Energy-saving driving system for elevator
CN201629676U (en) * 2010-01-29 2010-11-10 富士工业(青岛)电梯制造有限公司 Elevator matrix frequency conversion device
CN104909274A (en) * 2015-05-21 2015-09-16 杭州江河机电装备工程有限公司 Hoisting machinery high-speed ratio transmission system
CN205544318U (en) * 2015-12-07 2016-08-31 杭州江河机电装备工程有限公司 Hoisting machinery matrix energy repayment transmission system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1503493A2 (en) * 2003-07-30 2005-02-02 Potain Control device for a brake resistor of a frequency converter
CN1725627A (en) * 2005-06-27 2006-01-25 广州日立电梯有限公司 Energy-saving driving system for elevator
CN201629676U (en) * 2010-01-29 2010-11-10 富士工业(青岛)电梯制造有限公司 Elevator matrix frequency conversion device
CN104909274A (en) * 2015-05-21 2015-09-16 杭州江河机电装备工程有限公司 Hoisting machinery high-speed ratio transmission system
CN205544318U (en) * 2015-12-07 2016-08-31 杭州江河机电装备工程有限公司 Hoisting machinery matrix energy repayment transmission system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109264586A (en) * 2018-10-17 2019-01-25 南通航运职业技术学院 A kind of design method of harbor quayside crane energy feedback system
CN111181471A (en) * 2020-01-17 2020-05-19 深圳市英威腾电气股份有限公司 Multi-frequency converter equipment and master-slave control system and method of frequency converter of multi-frequency converter equipment

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Application publication date: 20160224