CN102412782B - System and method for controlling power supply switch in bypass frequency conversion stairway - Google Patents
System and method for controlling power supply switch in bypass frequency conversion stairway Download PDFInfo
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- CN102412782B CN102412782B CN201010290761.7A CN201010290761A CN102412782B CN 102412782 B CN102412782 B CN 102412782B CN 201010290761 A CN201010290761 A CN 201010290761A CN 102412782 B CN102412782 B CN 102412782B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B25/00—Control of escalators or moving walkways
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- Control Of Ac Motors In General (AREA)
Abstract
The invention relates to a system and a method for controlling power supply switch in a bypass frequency conversion stairway. The system and the method are used for switching a motor drive power supply from a frequency-variable controller into a power frequency power supply. The system comprises a frequency-variable controller, a line sequence detecting unit and a switching control unit, wherein the line sequence detecting unit is used for obtaining a motor line sequence; the line sequence is a connection relationship between a motor terminal and a power frequency power supply during power frequency operation; the switching control unit is used for adjusting the output frequency of the frequency-variable controller so that the difference between the output frequency of the frequency-variable controller and the power frequency power supply frequency is a first frequency; and then a synchronous time point is obtained according to the motor line sequence and the value of the first frequency, and the motor drive power supply is switched to the power frequency power supply at the synchronous time. The invention further provides a corresponding control method. According to the system and method provided by the invention, the synchronously switch time point is obtained through the connection relationship between the motor terminal and the power frequency power supply, thereby finishing the switch from the frequency conversion operation to the power frequency operation, and avoiding the complex debugging process.
Description
Technical field
The present invention relates to staircase control field, more particularly, relate to handover control system and method in a kind of bypass frequency conversion staircase.
Background technology
Escalator, pavement are widely used in the larger occasions of flow of the people such as station, market, airport.In order to realize the efficient operation of escalator, conventionally adopt bypass frequency conversion technology.
Bypass frequency conversion technology refers to: when staircase (or pavement) acceleration, deceleration, low cruise, adopt frequency-variable controller out-put supply drive motors; When staircase high-speed cruising, adopt industrial power drive motors.When staircase brings into operation, by frequency-variable controller, drive traction machine, when staircase reaches normal speed operation, be switched to power frequency and drive operation; When entering without passenger within the predefined time, staircase is switched to converting operation by power frequency operation, and speed drops to the crawl speed operation of setting gradually; If being arranged on the transducer at staircase gateway place has detected passenger and has entered, staircase rises to normal speed by frequency-variable controller by the speed of service so, and again switch to power frequency operation, if passenger constantly enters staircase, staircase will be always with normal speed power frequency operation.
Bypass frequency conversion technology has been saved the energy consumption of staircase operation to greatest extent, but also excess energy can be fed back to electrical network.A key issue of bypass frequency conversion technology is exactly how to realize synchronous switching.Yet existing control system is carrying out when frequency conversion is switched with power frequency having following problem: the debugging of switching of synchronizeing is manual debugging completely.The major defect of this adjustment method has two: (1) exploratory debugging, often to waste the longer time of commissioning staff; (2) tentative switching repeatedly before finding synchronous point, due to asynchronous, motor vibrating is often very violent, and this has larger impact and wearing and tearing to electrical system, mechanical structure.
Summary of the invention
The technical problem to be solved in the present invention is, in above-mentioned bypass frequency conversion staircase synchronous switch debugging complicated problem, electrical source exchange control system and method in a kind of bypass frequency conversion staircase are provided.
The technical scheme that the present invention solves the problems of the technologies described above is, electrical source exchange control system in a kind of bypass frequency conversion staircase is provided, for motor drive power supply is switched to power frequency supply from frequency-variable controller, comprise frequency-variable controller, line order detecting unit, synchronous coefficient table and switch control unit, wherein:
Described line order detecting unit, be used for obtaining motor lines order, annexation when described line order is power frequency operation between motor terminal and power frequency supply, and this line order detecting unit obtains line order in the following manner: the terminal of motor is switched to power frequency supply also according to the feedback signal acquisition from motor terminal the motor lines order bank switching from frequency-variable controller;
Described switch control unit, for adjusting the output frequency of frequency-variable controller, making the output frequency of frequency-variable controller and the difference of power frequency supply frequency is first frequency; Then according to the value of motor lines order and described first frequency, obtain synchronization point point and at described synchronization point, motor drive power supply be switched to power frequency supply;
Described synchronous coefficient table stores the corresponding synchronization point of each line order of motor under first frequency, and described switch control unit obtains synchronization point point according to motor lines order inquiry synchronous coefficient table.
In electrical source exchange control system in bypass frequency conversion staircase of the present invention, described line order detecting unit is realized by synchronous switch card, the input of described synchronous switch card is connected to power frequency supply, test side is connected to two input terminals of motor, and signal output part is connected to the analog input end of frequency-variable controller.
In electrical source exchange control system in bypass frequency conversion staircase of the present invention, described first frequency is greater than zero and be less than 10Hz.
The present invention also provides the electrical source exchange control method in a kind of bypass frequency conversion staircase, for motor drive power supply is switched to power frequency supply from frequency-variable controller, comprises the following steps:
A, by by the terminal of motor from frequency-variable controller be switched to power frequency supply and according to feedback signal obtain and bank switching motor lines order, annexation when described line order is power frequency operation between motor terminal and power frequency supply;
The output frequency of b, adjustment frequency-variable controller, making the output frequency of frequency-variable controller and the difference of power frequency supply frequency is first frequency;
C, according to motor lines order inquiry synchronous coefficient table, obtain the synchronization point point under described first frequency, described synchronous coefficient table stores the corresponding synchronization point coefficient of each line order of motor under first frequency;
D, at described synchronization point, motor drive power supply is switched to power frequency supply.
In electrical source exchange control method in bypass frequency conversion staircase of the present invention, in described step a, by synchronous switch card, obtain motor lines order, the input of described synchronous switch card is connected to power frequency supply, test side is connected to two input terminals of motor, and signal output part is connected to the analog input end of frequency-variable controller.
In electrical source exchange control system in bypass frequency conversion staircase of the present invention, described first frequency is greater than zero and be less than 10Hz.
Electrical source exchange control system and method in bypass frequency conversion staircase of the present invention, synchronize the time point of switching and complete converting operation to the switching of power frequency operation thereby the annexation by motor terminal and power frequency supply obtains, and avoided complicated debug process.And the present invention has no requirement to the order of connection of the links such as motor to motor, frequency-variable controller to up-downgoing contactor, up-downgoing contactor to electric power incoming line RST, this makes the installation cabling of staircase control system more flexible.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the schematic diagram of the electrical source exchange control system embodiment in bypass frequency conversion staircase of the present invention;
Fig. 2 is the schematic diagram of the embodiment of Fig. 1 center line order detecting unit;
Fig. 3 is the schematic diagram of the electrical source exchange control system in bypass frequency conversion staircase of the present invention;
Fig. 4 is the flow chart of the electrical source exchange control method embodiment in bypass frequency conversion staircase of the present invention.
Embodiment
This method has realized the automatic adjusting of synchronous switching, as long as after once switching, then without other debugging, can obtain satisfied switching effect.And the present invention does not need to adjust any parameter, can accomplish to be converted to taking over seamlessly of power frequency operation, reduced to a great extent the debugging difficulty of synchronous switching link.
As shown in Figure 1, be the schematic diagram of the electrical source exchange control system embodiment in bypass frequency conversion staircase of the present invention, this system is for being switched to power frequency supply by motor drive power supply from frequency-variable controller.In the present embodiment, control system comprises frequency-variable controller 12, line order detecting unit 13 and switch control unit 12, wherein the output of frequency-variable controller 12 is connected to the input terminal of motor 14, the input terminal of motor 14 is also connected to power frequency supply, and the test side of line order detecting unit 13 is connected at least two terminals in input end of motor.Frequency-variable controller 12 can be universal frequency converter.
Line order detecting unit 13 is for obtaining motor lines order, annexation when its center line order is power frequency operation between motor terminal and power frequency supply.The input terminal U21, the V21 that suppose motor are upper by the R, the S that are connected to power supply, and physical cabling situation is as shown in table 1.As shown in Table 1, the line order of input end of motor has 6 kinds, and which order line order detecting unit 13 specifically belongs to for detection of input end of motor.The line order of 6 kinds of wiring situations is numbered to 1～6, if 1,4,6 line ordered pairs are answered motor forward, 2,3,5 corresponding motor reversals.
| Line order | U21 | V21 |
| 1 | R | S |
| 2 | T | S |
| 3 | S | R |
| 4 | S | T |
| 5 | R | T |
| 6 | T | R |
Table 1: motor lines order
As shown in Figure 2, be the schematic diagram of a specific implementation of line order detecting unit 13.In the present embodiment, the input of line order detecting unit 13 (R, S, T) is connected to power frequency supply, test side (U, V) is connected on any two terminals in three input end of motor.In the present embodiment, line order detecting unit 13 obtains line order in the following manner: by the terminal of motor from frequency-variable controller 12 be switched to power frequency supply and according to the feedback signal of test side (U, V) obtain and bank switching motor lines order.Phase characteristic due to power frequency supply (three-phase alternating current) itself, the input end of motor sub-connection that the output valve of output terminals A I1, the AI2 of line order detecting unit 13 connects with test side changes to the order of power frequency supply, and the output terminals A I1 of line order detecting unit 13 and the output valve of AI2 are directly corresponding with motor lines order.
Certainly, in actual applications, also can adopt other modes to obtain motor lines order, line order detecting unit 13 also can adopt other circuit structures.
Switch control unit 11 is for adjusting the output frequency of frequency-variable controller, and making the output frequency of frequency-variable controller and the difference of power frequency supply frequency is first frequency; Then according to the value of motor lines order and first frequency, obtain synchronization point point (because output frequency and the power frequency supply frequency of frequency-variable controller exists difference on the frequency, so both phase cyclings are synchronous) and at above-mentioned synchronization point, motor drive power supply be switched to power frequency supply.In the present embodiment, also comprise the synchronous coefficient table of the corresponding synchronization point of each line order that stores motor under first frequency, thereby switch control unit 11 obtains synchronization point point according to the motor lines order inquiry table of comparisons.In actual applications, according to synchronous coefficient table and the on-the-spot synchronization point point switching that calculates of first frequency.Above-mentioned first frequency is greater than zero and is less than 10Hz, for example, can be 1.5Hz.
As shown in Figure 3, be the schematic diagram of the concrete application of system in Fig. 1.In this application, line order detecting unit 13 can be synchronous switch card, the input of this synchronous switch card (R, S, T) is connected to power frequency supply, test side (U, V) is connected to two input terminals of motor, control output end is connected to the analog input end of frequency-variable controller 12, thereby control, switches (making contactor Kout disconnection, Kup closure).Particularly, the synchronous switch card of MCTC-TBB-A that above-mentioned synchronous switch card can adopt SuZhou MoNaKe Control Technology Co., Ltd.
As shown in Figure 4, be the flow chart of the electrical source exchange control method embodiment in bypass frequency conversion staircase of the present invention.Before and after the principle of switching guarantees to switch exactly, motor terminal voltage-phase is synchronous, and when converting operation, the phase place on motor terminal is consistent with the phase place that appears at the power frequency electricity on motor terminal after switching.The method comprises the following steps:
Step S41: obtain motor lines order, annexation when this line order is power frequency operation between motor terminal and power frequency supply.This step can realize in the following manner: first once force switching, the terminal of motor is switched to power frequency supply from frequency-variable controller; Then according to the feedback signal acquisition from motor terminal the motor lines order after bank switching.Particularly, can obtain motor lines order by synchronous switch card, the input of this synchronous switch card is connected to power frequency supply, and test side is connected to two input terminals of motor, and signal output part is connected to the analog input end of frequency-variable controller.
Step S42: adjust the output frequency of frequency-variable controller, making the output frequency of frequency-variable controller and the difference of power frequency supply frequency is first frequency, this first frequency is greater than zero and is less than 10Hz(and is assumed to be 1.5Hz).
Step S43: before being switched to power frequency operation, obtain synchronization point point according to the value of motor lines order and first frequency.Owing to having difference on the frequency between the output of frequency-variable controller and power frequency supply, so the phase difference between them will periodically change, and the frequency of variation is exactly above-mentioned first frequency (1.5Hz).That is to say, during now frequency-variable controller operation, the phase place of its output can periodically be synchronizeed with target phase.This synchronous moment switch can realize level and smooth excessively.
Step S44: motor drive power supply is switched to power frequency supply at synchronization point.
In electrical source exchange control method in above-mentioned bypass frequency conversion staircase, in step S43, according to motor lines order inquiry synchronous coefficient table and in conjunction with first frequency acquisition synchronization point point, this contrast synchronous coefficient table stores the corresponding synchronization point coefficient of each line order of motor under different frequency.
The present invention is by obtaining motor lines order, rather than the direct synchronization point point that goes for switching according to target phase, avoided phase place as analog quantity inaccuracy, be easily disturbed, be subject to the defect of the factor impacts such as line voltage ambient temperature, and with frequency-variable controller output and the difference on the frequency of power frequency supply, calculate the switching cycle of synchronizeing of every kind of line order, in service as long as search corresponding coefficient according to line order, can be easy to obtain actual some switching time, look-up table is more more efficient, quick, succinct than calculating in real time.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (6)
1. the electrical source exchange control system in bypass frequency conversion staircase, for motor drive power supply is switched to power frequency supply from frequency-variable controller, is characterized in that, comprises frequency-variable controller, line order detecting unit, synchronous coefficient table and switch control unit, wherein:
Described line order detecting unit, be used for obtaining motor lines order, annexation when described line order is power frequency operation between motor terminal and power frequency supply, and this line order detecting unit obtains line order in the following manner: the terminal of motor is switched to power frequency supply also according to the feedback signal acquisition from motor terminal the motor lines order bank switching from frequency-variable controller;
Described switch control unit, for adjusting the output frequency of frequency-variable controller, making the output frequency of frequency-variable controller and the difference of power frequency supply frequency is first frequency; Then according to the value of motor lines order and described first frequency, obtain synchronization point point and at described synchronization point, motor drive power supply be switched to power frequency supply;
Described synchronous coefficient table stores the corresponding synchronization point of each line order of motor under first frequency, and described switch control unit obtains synchronization point point according to motor lines order inquiry synchronous coefficient table.
2. the electrical source exchange control system in bypass frequency conversion staircase according to claim 1, it is characterized in that, described line order detecting unit is realized by synchronous switch card, the input of described synchronous switch card is connected to power frequency supply, test side is connected to two input terminals of motor, and signal output part is connected to the analog input end of frequency-variable controller.
3. the electrical source exchange control system in bypass frequency conversion staircase according to claim 1, is characterized in that, described first frequency is greater than zero and be less than 10Hz.
4. the electrical source exchange control method in bypass frequency conversion staircase, for motor drive power supply is switched to power frequency supply from frequency-variable controller, is characterized in that, comprises the following steps:
A, by by the terminal of motor from frequency-variable controller be switched to power frequency supply and according to feedback signal obtain and bank switching motor lines order, annexation when described line order is power frequency operation between motor terminal and power frequency supply;
The output frequency of b, adjustment frequency-variable controller, making the output frequency of frequency-variable controller and the difference of power frequency supply frequency is first frequency;
C, according to motor lines order inquiry synchronous coefficient table, obtain the synchronization point point under described first frequency, described synchronous coefficient table stores the corresponding synchronization point coefficient of each line order of motor under first frequency;
D, at described synchronization point, motor drive power supply is switched to power frequency supply.
5. the electrical source exchange control method in bypass frequency conversion staircase according to claim 4, it is characterized in that, in described step a, by synchronous switch card, obtain motor lines order, the input of described synchronous switch card is connected to power frequency supply, test side is connected to two input terminals of motor, and signal output part is connected to the analog input end of frequency-variable controller.
6. the electrical source exchange control method in bypass frequency conversion staircase according to claim 4, is characterized in that, described first frequency is greater than zero and be less than 10Hz.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010290761.7A CN102412782B (en) | 2010-09-21 | 2010-09-21 | System and method for controlling power supply switch in bypass frequency conversion stairway |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010290761.7A CN102412782B (en) | 2010-09-21 | 2010-09-21 | System and method for controlling power supply switch in bypass frequency conversion stairway |
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| CN102412782A CN102412782A (en) | 2012-04-11 |
| CN102412782B true CN102412782B (en) | 2014-09-10 |
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| CN109510471B (en) | 2017-09-15 | 2022-11-04 | 奥的斯电梯公司 | Frequency converter, bypass frequency conversion control system and switching control method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101056085A (en) * | 2006-04-12 | 2007-10-17 | 苏州江南嘉捷电梯有限公司 | Smooth switching method for AC motor from transducer power to industrial power |
| CN101054158A (en) * | 2007-03-09 | 2007-10-17 | 华东师范大学 | Self-separation manufacturing method for silicon micro-channel structure |
| CN201113439Y (en) * | 2007-06-19 | 2008-09-10 | 深圳市中传电气技术有限公司 | Large power frequency converter power frequency and variable frequency automatic switching device |
| CN201415910Y (en) * | 2009-04-13 | 2010-03-03 | 杭州思佳电气技术有限公司 | Escalator controller |
-
2010
- 2010-09-21 CN CN201010290761.7A patent/CN102412782B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101056085A (en) * | 2006-04-12 | 2007-10-17 | 苏州江南嘉捷电梯有限公司 | Smooth switching method for AC motor from transducer power to industrial power |
| CN101054158A (en) * | 2007-03-09 | 2007-10-17 | 华东师范大学 | Self-separation manufacturing method for silicon micro-channel structure |
| CN201113439Y (en) * | 2007-06-19 | 2008-09-10 | 深圳市中传电气技术有限公司 | Large power frequency converter power frequency and variable frequency automatic switching device |
| CN201415910Y (en) * | 2009-04-13 | 2010-03-03 | 杭州思佳电气技术有限公司 | Escalator controller |
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| CN102412782A (en) | 2012-04-11 |
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Effective date of registration: 20160127 Address after: Wuzhong District Wuzhong Economic Development Zone, Suzhou City, Jiangsu province 215000 Wang Xiang Shan Industrial Park Road on the north side of friends Patentee after: Suzhou Huichuan Technology Co.,Ltd. Patentee after: Shenzhen Inovance Technology Co., Ltd. Address before: Suzhou Industrial Park Suzhou city Jiangsu province 215006 Tong Road No. 25 Tak Industrial Park Building 3 Huichuan Patentee before: Suzhou Monarch Control Technology Co., Ltd. Patentee before: Shenzhen Inovance Technology Co., Ltd. |