CN102351119A - Public direct-current circuit technology for alternating-current permanent-magnet synchronous variable-frequency elevator - Google Patents
Public direct-current circuit technology for alternating-current permanent-magnet synchronous variable-frequency elevator Download PDFInfo
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Abstract
The invention discloses a public direct-current circuit technology for an alternating-current permanent-magnet synchronous variable-frequency elevator and belongs to the technical field of a frequency converter technology used for elevators and a variable-frequency control alternating-current permanent-magnet synchronous motor technology in the field of elevators. The public direct-current circuit technology is characterized in that the frequency converter dragging systems of two or more than two elevators share the same direct-current power supply system to supply power; and a single elevator frequency converter can remove an internal three-phase rectifier module, a brake resistor and other relevant electrical appliance configurations. The public direct-current circuit technology has the following energy-saving technical application: a gravity difference between an elevator lift car and elevator counter-weight is fully utilized; when the elevator is operated, the alternating-current permanent-magnet synchronous motor is respectively on an energy consumption function and a regeneration generator function; gravitational potential energy is supplied to the dragging elevators of other operating elevators to consume and use in the system by a connected public direct-current power-supply circuit after being rectified by the frequency converter dragging systems in a regeneration electric energy mode. According to the invention, the direct-current power supply voltage is stabilized and the elevator regeneration energy is stored and utilized in the system by virtue of the technical means, such as connected energy-storage devices, electric energy feedback devices and the like.
Description
Technical field
Along with the development of elevator control technology and variable-frequency variable-voltage drive technology, the variable-frequency variable-voltage dragging system has obtained using widely in elevator device.Along with the rapid expansion in elevator market, domestic elevator recoverable amount and increment also are into the increase of multiple.Elevator brings the time easy for going up and down for the numerous common people, has brought the lot of consumption of energy simultaneously.
National environmental protection and energy-conservation green policy under, how to allow elevator in use realize the low energy consumption index, saves energy consumption becomes the focus that lift charge department and elevator enterprises are more and more paid close attention to.Elevator device is saved energy and reduce the cost, more and more become the target of a lot of elevator enterprises future-oriented strategies.
Background technology
Present elevator; The frequency convertor system of elevator is the separate unit independent design; Be lower than the elevator below 2.5 meter per seconds for running velocity; It is that mode through resistance heating consumes timely that permagnetic synchronous motor outputs to electric energy following of resistance braking state; The electric energy that is discharged under the elevator energy consumption braking does not give to utilize fully again, has caused a large amount of wastes of the energy.
Be higher than 2.5 meters express elevator and super high speed elevator for speed, a lot of enterprises have all expanded energy feedback unit on frequency conversion system, and the electric energy of the regeneration of elevator motor is fed back in the power supply grid, and other electrical equipment of supplying with in the electrical network use.Though a part of power consumption has been saved in this kind design, the early investment cost is too high, and the energy source feedback device also is the separate unit independent design, so also on elevator, be not configured on a large scale and put in the application market.
Summary of the invention
The public direct current circuit technology is realized energy-saving and cost-reducing know-why explanation:
For the ease of carrying out theoretical analysis; This paper is with variable-frequency variable-voltage drive technology and configuration AC permanent magnet synchronous motor; Adopting the mode of general-duty elevator energy consumption resistance configuration is the analysis of being carried out under the engineering factor; Other expenditure of energys when simultaneously elevator being moved; Like the friction consumption of movable parts and stationary parts, the energy resource consumption of apparatus for controlling elevator etc. is ignored.For the AC permanent-magnet synchronous frequency conversion elevator that has disposed the energy consumption feedback system, the analysis of know-why is also effective.
Elevator is in the osed top hoistway, and the variation of the rotation direction through motor drags the cab of elevator and carries out frequent up-and-down movement, reaches the function of conveying people and weight.In the running process of elevator; When the quality of cab weight and counterweight is unequal; Can consume the electric energy of electric power system supply or with cab and counterweight system owing to the gravitional force that the weight difference produces finally consumes through heat-producing mode, thereby cause the waste of the energy.
The main process of energy conversion in the running process of elevator is following; Process status 1: when elevator cage weight during greater than counterweight weight; Like upwards operation of elevator; The elevator variable frequency dragging system stores through the gravitional force under differing heights that permagnetic synchronous motor is converted into kinematic scheme the electric energy of electric power system input in elevator device; Elevator device is in the power consumption state; The permagnetic synchronous motor of elevator arrangement serves as the drive motor pattern, and electric energy is converted into mechanical energy; When elevator is descending; Elevator is under the effect of kinematic scheme (car weight-counterweight weight) gravitional force; Convert gravitional force into electric energy through permagnetic synchronous motor again; And the gravitional force of the system stores mode through heat energy consumed on the braking resistor of frequency conversion dragging system configuration; From making the descending arrival of elevator and stopping at appointed positions; Elevator does not consume the electric energy of electric power system basically in descending process.
Process status 2: when elevator cage weight during less than counterweight weight; Like elevator in the process of upwards operation; Under the effect of elevator motion system (counterweight weight-car weight) gravitional force; Convert gravitional force into electric energy through permagnetic synchronous motor; And the gravitional force of the system stores mode through heat energy in time consumed in the braking resistor of frequency conversion dragging system configuration; From making ascending for elevator and stopping to assigned address; Gravitional force is converted into heat energy, and elevator does not consume the electric energy of electric power system.Move downwards like elevator, the gravitional force under differing heights that the electric energy that the elevator variable frequency dragging system is imported electric power system is converted into kinematic scheme stores in elevator device, and elevator device is in the power consumption state.
Process status 3: when the cab weight of elevator equals counterweight weight, when lift car moves up and down under the theory state, all need not consume the electric energy of electric power system input, also not to frequency conversion dragging system output electric energy.But under the existing condition, elevator need be imported less electric energy in order to overcome lift car system, Elevator weight sensor system and other elevator running gears friction force when moving from electric power system.
Along with the widespread use on the permagnetic synchronous motor market, the rotor of AC permanent magnet synchronous motor adopts the permanent-magnet steel structure, so synchronous dynamo has the dual nature of DC machine and electrical generator.When motor under external world power supply, play a part motor, convert electrical energy into mechanical energy.When permagnetic synchronous motor extraneous reader tool can state under, permagnetic synchronous motor plays a part electrical generator, converts mechanical energy into electric energy.
AC permanent magnet synchronous motor for frequency conversion drive; Car system and counterweight system are under the force distance of gravitational difference; Through drivings device such as steel rope, steel band, belts; Driving host is carried out regenerative power generation state; Permagnetic synchronous motor serves as the alternating current generator function; (non-power frequency) alternating current of being sent out is through on the high-power thyristor in the frequency conversion dragging system and the backward diode that connects, and carries out the three-phase bridge rectification output DC once more and is delivered directly on the dc bus in the frequency conversion dragging system.Direct current medium voltage on the dc bus of frequency conversion dragging system can raise.When the vdc on the bus is elevated to the ceiling value of monitor value of frequency conversion dragging system; The frequency conversion dragging system can be connected the controlled electric power power electronic devices (like thyristor) that is connected in energy consumption resistance; With through the thyristor control end being carried the control wave of certain dutycycle; Electric energy on the bus is consumed with the mode of pulse release, thereby accomplish heat energy conversion between electric energy that permagnetic synchronous motor produces and braking resistor.Promptly accomplish elevator motion system gravitional force to heat energy conversion, gravitional force falls through thermal energy consumption, and is non-renewable, thereby waste energy.
Express elevator configuration electric energy feedback inversion transformation device for a lot of enterprise production on the market; The regenerative electric energy (gravitional force conversion) that produces after can the permagnetic synchronous motor with elevator device feeds back in the three phase supply network system after direct current (DC) being converted into the power frequency electricity of 50 hertz of three-phases through electric energy feedback apparatus; Other and the current consumer that connects consume on the supply network; Reach the utilization once more of the energy, thereby can play the effect that reduces elevator energy consumption.But because energy back feed device is with high content of technology; Cost is big, and elevator uses client's one-time investment cost high, and can there be emc issue etc. in the elevator energy of feedback simultaneously to power supply grid; Need input cost to go to overcome, so do not obtain general application at present yet.
Energy-conservation and the technical advantage analysis of public direct current power supply system circuit:
For the variable-frequency variable-voltage dragging system; The process of variable-frequency variable-voltage is meant the three-phase alternating current power frequency electricity (380 VAC) with the electric power system input; Be rectified into direct current (DC) through configuration rectification module in the frequency conversion dragging system; Through on the dc bus and the filter capacitor that connects make vdc for maintaining about 540 (380 * 1.414) volts; Variable through mode output voltages such as PWM again; The equivalent three plase alternating current of changeable frequency; The conversion work of electric energy to mechanical energy accomplished in the running of driving AC permanent magnet synchronous motor.All disposed the conversion of AC rectification module completion AC-to DC now in the general-duty frequency conversion dragging system.Through the voltage fluctuation upper range of dc bus in the monitoring frequency conversion dragging system, remove to control consumption or the regenerative electric energy feedback device of regenerated energy on braking resistor and remove feedback meeting Alternating Current Power Supply electrical network again.
Permagnetic synchronous motor frequency conversion dragging system all has an independently exchange conversion straight-though device.For the elevator more than two or two in the same zone; Break away from frequency conversion dragging system separately like the AC-DC loop that will dispose in all elevator variable frequency dragging systems; Be integrated into an independently AC-DC synergic system; Three plase alternating current is rectified into the stable dc power supply that satisfies the requirement of frequency conversion dragging system, uses through all elevator variable frequency dragging systems in the circuit breaker ways of connecting feed system.Promptly allow all dispose the public unified DC supply of frequency conversion dragging system of the elevator of AC permanent magnet synchronous motor, public same DC loop, all frequency conversion dragging systems are being attempted by on the dc bus.This variation can allow the frequency conversion dragging system of separate unit elevator need not separate configurations AC rectification module, and regenerative brake resistance etc. can also be saved AC reactor, devices such as filter and direct current reactor.Can also not re-use independently energy consumption control thyristor, oversimplify and the design of miniaturization frequency conversion dragging system, significantly reduce the productive costs and the application cost of frequency conversion dragging system, have very strong cost advantage.
Adopt public direct current loop frequency conversion drive technology to drive elevator; If in a building or a city system a lot of portions elevator is arranged; When the platform number of elevator greater than two; And during One's name is legion; Because the time randomness of elevator service direction; The permagnetic synchronous motor of elevator is according to the weight difference and the service direction of counterweight system and car system, and the role who is undertaking drive motor and electrical generator who does not stop consumes the electric energy in public direct current loop or to public direct current loop transport electric energy.According to conservation of energy theorem; In perfect condition; Not considering rubs waits under the situation of other factors; The inverted running same distance energy needed that the electric energy that equal motor power and equal car and to the elevator of gravitational difference, elevator are sent under regenerative power generation state is supplied another elevator fully.Elevator is many more in the public direct current loop, at one time in the section.Consumed power is identical with the elevator probability that is in the generator operation state simultaneously for the elevator of the system in public direct current loop, and vdc is stable more, and power consumption is few more, and power savings advantages is obvious more, the power savings advantages in Here it is public direct current loop.
The public direct current loop power consumes and two kinds of extreme cases of energy regeneration illustrate that the elevator that the AC permanent-magnet synchronous frequency conversion drags is when the public direct current current supply circuit, and there are two kinds of very big and minimum extreme cases in the voltage on the bus, and explanation as follows respectively.
Maximum power consumption state (as going to work peak period) to the power supply input system.Be that all AC permanent magnet synchronous motor in the public direct current loop all are in the motor-driven state, this moment, all elevators all consumed the electric energy of electrical network, and the dc bus load current is maximum, and the horsepower output of dc bus is maximum, causes the voltage of bus will arrive minimum.When if DC bus-bar voltage is lower than the minimum vdc limit value of frequency conversion dragging system, the frequency conversion dragging system can't normal operation, et out of order.
Technical scheme measure under this kind state can have dual mode, and the dual mode independent can be carried out unitized design
Like the dc output power design plan: promptly through calculating on the dc bus maximum power of all and the elevator that connects; Go to design AC-DC power transformation system, make the dc output power of power transformation system satisfy online all the elevator maximal input sums of common DC bus and maintain certain safe clearance.According to the quantity and the power of elevator arrangement in the public direct-current net, adopt the busbar branches technology, according to the length of direct current supply line, confirm the quantity and the gross output power of elevator in the branch line, reduce the voltage loss on the dc bus.Guarantee that the VD of DC bus-bar voltage under the maximum energy consumption state satisfies that frequency conversion drags the minimum requirements of loop to vdc in the system;
Compensation scheme: in AC-DC system independently, through at the direct current outgoing side and connect mode such as closed-center system, as inserting the storage battery (group) that can discharge and recharge, high-capacity direct current electric capacity etc.When DC loop is under the high energy consumption state; Bus voltage reduces; When voltage is reduced to a certain order of magnitude be; The control monitor unit that the intrasystem bus voltage of alternating current-direct current power transformation is set with information in time be sent to the intrasystem control system of alternating current-direct current power transformation (if any); Control system is according to the reduction scope of voltage; Send control signal; With the battery pack that disposes in the system in time and receive on the dc bus; Change to the elevator supply in the dc bus system to electric energy through the storage battery chemical power, thereby play the voltage effect that increases output DC capacity stable DC bus.During design AC/DC power transformation cabinet; Can be according to the total volume of bus-bar system; The group number of incorporating intrasystem energy-storage battery (accumulate pond) into can be designed to many groups; The intrasystem control system of AC-DC will be according to bus voltage reduction and the voltage range that raises; Controlled in real-time inserts or is disconnected to the group number of the battery pack on the bus, and DC bus-bar voltage is more tended towards stability.
Minimal energy consumption state (maximum regeneration energy state; As coming off duty peak period); When elevators all in the DC loop system all is in electric energy reproduced state (generating); This moment, elevator did not consume the electric energy on the bus; On dc bus, export electric energy on the contrary, cause common DC bus voltage to be raised.If when DC bus-bar voltage was elevated to the maximum voltage restriction of frequency conversion dragging system, too high bus voltage can be burnt by the frequency conversion dragging system.
To the technical scheme measure under the least energy consumption state
Adopt the scheme of energy storage: promptly in alternating current-direct current power transformation system; The vdc outgoing side is through the mode of parallelly connected apparatus for storing electrical energy, as connect the identical battery pack of the vdc grade of certain group of number (battery through serial connection with and the mode that connects satisfy the needs of voltage and maximum current).The intrasystem control system of AC-DC will be according to bus voltage reduction and the voltage class that raises, and control in real time inserts or be disconnected to the group number of the battery pack on the bus, satisfies the needs of stable DC bus voltage storage more than electric energy;
Or adopt dc inverter to become the mode of alternating current; Directly serial connection other with high capacity current consumer mode: promptly at the dc output end of alternating current-direct current power transformation system and connect the dc-to-ac inverter device; Convert regenerated energy unnecessary on the dc bus to the three-phase main-frequency alternating current; Feed back to power supply grid; Or directly unnecessary direct current energy is led to that other common current consumers of in time connecting down in power transformation cabinet inner control system control use as: throw light on heating arrangement etc.
The public direct-current circuit system is formed framework and function introduction:
Introduce through the fwd principle, can find out that the main system in the DC loop comprises following components, as shown in Figure 1.
Fig. 1 representes is three grades power consumption network (practical application can be expanded):
The first order: be national grid each place substation, its function carries the 11KVAC three phase mains to second stage substation (community and factory) with identical now;
The second stage: alternating current-direct current substation (community's factory level), accomplish 540 volts of conversions of AC-to DC, and supply three-phase 380VAC, the power supply of individual event 220VAC and earth terminal;
The third stage: elevator customer;
Illustrate: when practical solution is used, can save the second stage, can directly supply satisfactory direct supply by national grid.
The function division of labor of public direct current loop on the second stage and the third stage is tentatively summed up, as shown in Figure 2:
The second stage: alternating current-direct current power transformation system (can be produced by the elevator enterprises design) reality needs existing function (selecting as required):
The voltage of input electrical network is carried out rectification, the two phase direct current (DC) (is benchmark with national grid voltage) of the about 540VDC of output, and supply single-phase 220VAC the source of AC of (or 3 phase 380VAC) simultaneously, and the terraced control system of supplying power, Lighting System is used.Also ground etc. need be provided, so dispose 5 out-put supply lines at least.Configuration is connected in the machine room electric power distribution cabinet of elevator customer.The transmission of electricity wire thicknesses is according to corresponding branch's elevator quantity and total power input decision.Distribution send power technology with reference to present correlation technique standard.
Need to be equipped with dc voltage detecting device in AC-DC electric power distribution cabinet or the substation, measure and the vdc load variations of monitoring output and the situation such as fluctuation of voltage;
Can dispose PLC controller or microcomputerized controller in AC-DC electric power distribution cabinet or the substation; The data of sampling vdc sensor input in time; That removes to control closed-center system (battery pack) dc bus that disposes in the substation according to timely magnitude of voltage switches on and off the effect of stable DC bus voltage;
According to what and the size of total power input of elevator quantity in the system, (like battery pack, the serial connection through some storage batterys also connects the many groups of selectivity configuration energy storage equipments, makes about the about 540VDC of voltage maintenance of battery pack.In order to guarantee safety, and the charging and discharging of accumulator voltage status that connects, heating situation etc. need be monitored by the control system in the substation in real time;
For battery pack alternating current-direct current substation is not installed; When control system monitors VD above set upper limit; Through connecting high-power electric appliance (like heating installation; Illumination), the mode that consumes of similar braking resistor, dc inversion becomes other electrical equipment or other user use in the mode Provisions of alternating current.
System expands scheme:
Because the research and development and the practicability of large value capacitor can replace battery pack with high-capacity electric capacity in substation now, play the work of stablizing the vdc on the bus through the electric charge storage and the discharge of large bulk capacitance;
Because all elevator public direct-flow bus wires, for other utilization of new energy resources are provided convenience, as can directly and connecing solar battery group, with the electric energy of solar energy converting through dc bus, the use of power supply ladder;
Development along with battery technology; Use the battery-operated automobile of the novel high efficiency that discharges and recharges part to move towards market and popularize; Therefore in the working space, business zone and residential development all need be equipped with the vehicle charging stake of some, satisfy the needs of the battery charge of automobile.For the voltage class of automobile batteries, can below the charging valtage of automobile batteries and the vdc in public direct current loop be carried out the normalisation unification in national standardization.Can carry out compatibility with the public dc power supply of elevator to the rechargeable electrical energy input of automobile batteries like this, be convenient to utilize the battery charge of the renewable sources of energy of elevator, can reduce the expense and the cost of public infrastructure development to automobile.
Frequency conversion drags the advantage of the synchronous elevator public direct current of AC permanent-magnet loop elevator technology
Power savings advantages: intrasystem AC permanent magnet synchronous motor; Changes in weight in its both sides of suspension; In different direction motions, meeting consumed power and generation electric energy both can be used as motor and had removed consumed energy; Can be used as electrical generator again and give intrasystem other elevator supplying energies; Save energy resource supply, simultaneously, intrasystem elevator quantity is many more; Energy-saving effect is obvious more, satisfies the energy-saving and cost-reducing target of country;
Cost advantage: owing to use the public direct current power supply technique; Elevator drive system (frequency converter) need not to be provided with the AC-DC module again; Need not to be provided with direct current reactor and electric capacity of voltage regulation; Save braking resistor and discharge control loop and high-power thyristor simultaneously; Make the simple more and modularization of frequency converter design, save the frequency converter cost;
System's expanding function advantage: owing to use the DC supply technology, be solar energy generation technology in the future, power-actuated vehicle provide ubiquitous charging unit, and industrialization prospect is obvious;
Easy realization advantage: intrasystem voltage monitoring of alternating current-direct current power transformation and control system, can adopt the technology of present comparative maturity, have only the minimizing of some components and parts in the frequency conversion dragging system, design little hardware design variation, technology is carried out easily, and executory cost is low.Along with the development that direct current supplies the power transformation technology, the market-oriented prospect advantage of public direct current loop frequency-changing elevator is more and more obvious.
Electromagnetic compatibility sexual clorminance:, do not need to consider again to drag the electromagnetic compatibility influence in loop owing to adopt DC supply;
The place that the realization of public direct current loop elevator technology should be noted that:
The dc power source capacity design in alternating current-direct current power transformation loop is confirmed to realize after needing to calculate;
Owing to adopt public bus, when the elevator quantity that inserts in the dc bus system is too much, can cause the voltage of bus to reduce; Can adopt busbar branches line mode; Confirm the lift capacity on each branch line earlier, the back also connects each branch line to same bus, forms supply networkization;
The design and installation of AC/DC substation need divide and account for a part of space, need to drop into certain cost and technology.If have only separate unit or a spot of elevator in the system, realize that public bus technology then can make cost increase;
Be linked in the substation battery pack on the dc bus (if any) charging and discharging state, temperature, voltage etc. need monitoring in real time, guarantee safe in utilization.In addition since battery life with to discharge and recharge number of times limited, need to realize breaking through through the development of battery technology.
The noun lexical or textual analysis:
AC/DC substation: accomplish three plase alternating current to galvanic translation function;
The frequency conversion dragging system: have another name called frequency converter, through the input three plase alternating current, power supply machine uses after variable-frequency variable-voltage is handled;
Dc bus: direct supply main line;
Braking resistor: have another name called energy consumption resistance, in order to the electric energy under the timely consumption permagnetic synchronous motor regenerative power generation state.
Claims (10)
1. drag elevator based on the AC permanent-magnet synchronous frequency conversion more than 2 or 2; It is through lead AC-DC module or AC-DC electric power system an independent design parallel with one another that frequency conversion drags the DC supply mode of loop on principle, and whether the independence of AC-DC module or AC-DC electric power system is not retrained the geometric space position in the control housing of a certain elevator or outside the control housing by it.
2. based on many elevator public direct current circuit systems of explanation on the claim 1, the not use that has or above elevator in the system at least independently three-phase alternating-current supply is connected to and gives frequency conversion dragging system supply electric energy in the frequency conversion dragging system.
3. based on many elevator public direct current circuit systems that illustrate on the claim 1; Have at least one or more elevator not dispose the three phase full bridge formula commutating circuit that three phase rectifier module independently or rectifier diode are formed, the needed electric energy of frequency conversion dragging system be with system in other elevators share same AC-DC module institute or hand over the direct current (DC) of output or the AC-DC electric power system of shared same independent design.
4. based on many elevator public direct current circuit systems that illustrate on the claim 1; Have the not configuration resistance braking resistance and correlation modules such as control resistance braking resistance conducting and open circuited high-power silicon controlled rectifier of one or above elevator in the system at least, high-power thyristor module (like needs) is controlled in shared same group of braking resistor of other elevators this elevator drive system and public direct-current loop in or resistance braking.
5. based on shared AC-DC module or the AC-DC electric power system of elevator in the system of claim 1 explanation; Be assembled in one or several independently in the cabinet, or with but the control housing or the frequency conversion dragging system that are not limited to intrasystem any elevator shared same cabinet.
6. based on the AC-DC module of the independent design of claim 5 explanation or the cabinet of AC-DC electric power system; The space mounting position of cabinet; Be not subjected to it whether in system in the machine room of any elevator, or in owner's the power distribution room or other limitation and restriction of space position separately or independently.
7. based on the power transformation cabinet of the independent design of claim 5 explanation; In the power transformation cabinet two dc buss of VD externally export adopt single branch and multiple-limb dispensing electric network structure, the power supply of intrasystem elevator variable frequency dragging system is connected on the bus through the mode of circuit breaker or main power switch.
8. based on the power transformation cabinet of the independent design of claim 5 explanation, can be designed with independently control system as required, independently VD fluctuation monitoring system is carried out monitoring, the effect of control and stable DC output voltage.
9. based on the power transformation cabinet of the independent design of claim 5 explanation; The direct current outlet side has been connected in parallel the electric pressure energy storage equipment with the VD grade identical (like the batteries of connection in series-parallel combination; Large bulk capacitance; Big capacity discharges and recharges battery); Be linked into the scope or the grade of the fluctuation that the capacity of energy storage equipment on the dc bus can press according to direct current bus bar; Control system by the configuration of power transformation cabinet carries out real-time on or off operation; Absorb the unnecessary regenerative electric energy of direct current outlet side and the electric energy of release stored, play the effect of stable output power transformation cabinet DC voltage.
10. based on the power transformation cabinet of the independent design of claim 5 explanation; Control system is according to the scope range of the fluctuation of voltage of output DC side; Be switched on or switched off those and be attempted by high-power electric appliance on the dc bus (like air-conditioning; Heating installation); Realize the concentrated use of the elevator regenerated energy, or and connect independently direct current and change the three-phase alternating current inverter with unnecessary electric energy feedback power supply grid etc.
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| CN106516918A (en) * | 2016-04-20 | 2017-03-22 | 福建省力霸机械科技有限公司 | Elevator energy saving device |
| CN107394824A (en) * | 2017-09-07 | 2017-11-24 | 天津天为电梯有限公司 | A kind of Solar-energy elevator control and power collecting device |
| CN113003359A (en) * | 2021-03-09 | 2021-06-22 | 江苏师范大学 | Energy feedback method and system for elevator |
| CN115159316A (en) * | 2022-06-22 | 2022-10-11 | 常熟理工学院 | Elevator energy-saving device and method with bidirectional buffering function |
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| CN113003359A (en) * | 2021-03-09 | 2021-06-22 | 江苏师范大学 | Energy feedback method and system for elevator |
| CN115159316A (en) * | 2022-06-22 | 2022-10-11 | 常熟理工学院 | Elevator energy-saving device and method with bidirectional buffering function |
| CN115159316B (en) * | 2022-06-22 | 2023-11-28 | 常熟理工学院 | Elevator energy-saving device and method with bidirectional buffer function |
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Application publication date: 20120215 |