CN101367479A - Brake device of elevator - Google Patents
Brake device of elevator Download PDFInfo
- Publication number
- CN101367479A CN101367479A CNA2008102109412A CN200810210941A CN101367479A CN 101367479 A CN101367479 A CN 101367479A CN A2008102109412 A CNA2008102109412 A CN A2008102109412A CN 200810210941 A CN200810210941 A CN 200810210941A CN 101367479 A CN101367479 A CN 101367479A
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- electromagnetic contactor
- drg
- elevator
- winding
- diode
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Abstract
The invention provides a brake device for an elevator which can not only further improve safety, but also can reduce the switching loss generated by turning on and off the unit. The brake device of the elevator comprises a rectification circuit (2) which shifting an alternating current to a direct current; a smoothing capacitor (3) connected to an output end of the rectification circuit; a series circuit of a diode (5) and a semi-conductor switch (6) parallelly connected with the smoothing capacitor; a brake winding (10) parallelly connected to the diode; a brake (11) with a brake force changing according to the electromagnetic force of the brake winding; and an calculation processing device (13) which generates a control command for controlling the semi-conductor on and off. The brake device of the elevator further comprises a first electromagnetic contactor (7) arranged between the diode (5) and the brake winding (10); and a second electromagnetic contactor (4) arranged between the smoothing capacitor (3) and the series circuit of the diode (5) and the semi-conductor (6).
Description
Technical field
The present invention relates to a kind of control flows and cross electric current in the drg winding with the brake equipment of the elevator that carries out braking maneuver.
Background technology
In known brake device of elevator, adopted to make vdc pass through drg winding (DC electromagnet), and the mode of coming brake off by its attractive force.In this mode, when vdc was big, the collision sound that produces when braking is removed increased, and at vdc hour, delaying can appear in braking maneuver.For this reason, proposed to come control flows to cross the scheme of the electric current of drg winding by the chopper circuit that uses on-off element, these methods are documented in patent documentation 1,2 and 3.Especially connecting electromagnetic contactor, drg has occurred open electromagnetic contactor preferably when unusual, so that the electric power disconnection, these methods are documented in patent documentation 1 and 2.
The flat 4-96675 communique of patent documentation 1 Japan's open patent
The flat 9-272664 communique of patent documentation 2 Japan's open patents
The patent documentation 3 open patent 2003-81543 of Japan communiques
Recently, security requirement is improved constantly, but in above-mentioned known technology, do not making consideration aspect the cut-out circuit that makes up multiplicated system.Specifically, in patent documentation 2 and 3 schemes of being put down in writing, though electromagnetic contactor is connected between on-off element and the braking winding, for example when this contact welding, it still needs to cut off electric power.
In addition, also propose to have other control method, it is in order to improve reliability, command value and detected value are compared, when the former is big, chopper circuit is connected, and at the former hour, chopper circuit is disconnected, perhaps use carrier wave that command value is compared, and connect (ON)/disconnection (OFF) action repeatedly, still, all can cause the switch number of times of chopper circuit to increase in above-mentioned scheme, thereby the loss of switch is increased.
Summary of the invention
The object of the present invention is to provide a kind of brake equipment of elevator, it not only can further improve safety, but also can reduce the switching loss that on-off element takes place.
In order to address the above problem, the invention provides a kind of brake equipment of elevator, the brake equipment of described elevator comprises: alternating current is transformed to galvanic rectifying circuit; Be connected the smooth condenser of the mouth of described rectifying circuit; The diode that is connected in parallel with described smooth condenser and the circuit series of semiconductor switch; The drg winding that is connected in parallel with described diode; The drg that braking force changes according to the electromagnetic force of described drg winding; And the arithmetic processing apparatus that generates the control command of described semiconductor switch, wherein, the brake equipment of described elevator further has: be arranged on the 1st electromagnetic contactor between described diode and the described drg winding; Be arranged on the 2nd electromagnetic contactor between the circuit series of described smooth condenser and described diode and semiconductor switch.
The invention effect
According to the present invention, owing to realized dualization of electromagnetic contactor, so brake device of elevator of the present invention not only can further improve safety, but also can reduce the switching loss that on-off element takes place, realize energy-conservationization by very simple control.
Description of drawings
Fig. 1 is the constructional drawing of expression first embodiment of the invention.
Fig. 2 is the example when electromagnetic contactor is arranged on other positions.
Fig. 3 is the scheme drawing of known brake equipment.
Fig. 4 is the example of the electric current that flows through the drg winding in the known brake equipment.
Fig. 5 is the example of the electric current that flows through the drg winding among first embodiment.
Fig. 6 is the enlarged drawing of the example of the electric current that flows through the drg winding among first embodiment.
Fig. 7 is the constructional drawing of expression second embodiment of the invention.
Nomenclature
1 source of AC
2 rectifying circuits
3 smooth condensers
4 the 2nd electromagnetic contactors
5 diodes
6 semiconductor switchs
7 the 1st electromagnetic contactors
8 current probes
9 resistance
10 drg windings
11 drgs
12 electrical motors (winch)
13 arithmetic processing apparatus
14 direct supplys
15 switches
16 voltage transformers
The specific embodiment
Followingly embodiments of the present invention are described with reference to accompanying drawing.
First embodiment
Fig. 1 is the brake equipment of the elevator of first embodiment of the invention, and the brake equipment of this elevator comprises: source of AC 1; Described source of AC 1 is transformed to galvanic rectifying circuit 2; Be connected the smooth condenser 3 of the mouth of described rectifying circuit 2; Diode 5; Be connected in series in the semiconductor switch 6 of the anode-side of described diode 5; One end is connected the drg winding 10 of the anode-side of diode 5; The 1st electromagnetic contactor 7 that is connected and carries out switch motion with the cathode side of the other end of drg winding 10 and diode 5; Be connected the current probe 8 between the 1st electromagnetic contactor 7 and the drg winding 10; The resistance 9 that is connected in parallel with drg winding 10; Be connected between the cathode side of the side of the positive electrode of smooth condenser 3 and diode 5 and between the end of the negative side of smooth condenser 3 and semiconductor switch 6 and the 2nd electromagnetic contactor 4 that carries out switch motion; Drive and be used as the electrical motor 12 of the power of elevator lifting action by not shown power inverter; Carry out the drg 11 of the braking maneuver of electrical motor 12; Generate and the instruction of output semiconductor switch 6 and when electrical motor 12 normally stops to move and the improper arithmetic processing apparatus 13 that instructs of open that sends contact when stopping to move to the 1st electromagnetic contactor 7 and the 2nd electromagnetic contactor 4 etc. according to the current signal that obtains from current probe 8.
When having taken place promptly to stop unusually when stopping under the elevator normal operating condition and because of system, thereby the contact of open electromagnetic contactor blocks power supply.The characteristics of first embodiment are by using 2 electromagnetic contactors to form duplex system, improving safety with this.The 1st electromagnetic contactor 7 is connected between diode 5 and the drg winding 10, and behind open its contact, winding current only circulates in the circuit between drg winding 10 and resistance 9, so can block power supply.The 2nd electromagnetic contactor 4 is connected between smooth condenser 3 and the diode 5 and between smooth condenser 3 and the semiconductor switch 6, opens by making this contact, also can block the power supply from smooth condenser 3.
Fig. 2 is the example when being arranged on electromagnetic contactor on other position.In this example, the 2nd electromagnetic contactor 4 is arranged between rectifying circuit 2 and the smooth condenser 3.At this moment, even disconnect the 2nd electromagnetic contactor 4, the residual charge of smooth condenser 3 still can be powered, so can't realize dualization fully.Therefore, importantly shown in first embodiment, be connected the 2nd electromagnetic contactor 4 between smooth condenser 3 and the diode 5 and between smooth condenser 3 and the semiconductor switch 6, thus, fault has taken place even can obtain one of them electromagnetic contactor, when for example welding having taken place, also can block the effect of power supply by another electromagnetic contactor.
Below the drive actions of electromagnetic contactor is described.Normal in service when stopping to move, arithmetic processing apparatus 13 is output command under the contact closing state of the 1st electromagnetic contactor 7, and, the open instruction of the contact of the open command of output semiconductor switch 6 and the 2nd electromagnetic contactor 4 simultaneously.At this moment, because the disconnection responsiveness of semiconductor switch 6 is faster than the opening operation speed of the 2nd electromagnetic contactor 4,, thereby can adopt the little equipment of contact rating (rated voltage and rated current etc.) so the burden of the 2nd electromagnetic contactor 4 is little.On the other hand, improper when stopping to move what promptly stop to wait, at first make the contact emergency open of the 1st electromagnetic contactor 7.The 1st electromagnetic contactor 7 also can have directly from arithmetic processing apparatus 13 mechanism that can detect the unusual external device (ED) reception clearing signal of elevator device in addition.Afterwards, semiconductor switch 6 is disconnected, and make the contact of the 2nd electromagnetic contactor 4 also open.In this is handled,, therefore need to use the bigger electromagnetic contactor of contact rating owing in the 1st electromagnetic contactor 7, excessive voltage may take place.That is, the characteristics of first embodiment are, the contact rating of the 1st electromagnetic contactor 7 is bigger than the contact rating of the 2nd electromagnetic contactor 4, and thus, having can be in the effect of considering suitableization of contact rating that makes electromagnetic contactor on the basis that stops to move.
Below the on of on-off element is described.Fig. 3 is the scheme drawing of known brake equipment, and this brake equipment is configured to direct supply 14 and is connected with resistance 9 with the drg winding 10 that is connected in parallel by switch 15.In known brake equipment, by being connected, switch 15 make winding current iL flow through drg winding 10, come brake off with this.Fig. 4 is the exemplary plot of the electric current that flows through the drg winding in the known brake equipment.When drg is open, requires and to respond fast.At this moment, by increasing the magnitude of voltage of the direct supply 14 among Fig. 3, shown in the electric current example 1 of Fig. 4, can realize the fast rise (build up time t1) of winding current iL., because the amplitude i1 of iL increases at this moment, and also increase thereupon of electromagnetic attraction, the collision sound that therefore can produce brake plate when making the braking releasing increases this harmful effect.On the other hand, in order to suppress collision sound,, shown in the electric current example 2 of Fig. 4, can suppress the amplitude i2 of winding current iL, and can reduce electromagnetic attraction by reducing the magnitude of voltage of the direct supply 14 among Fig. 3.But, because this moment, build up time t2 was elongated, so can produce this harmful effect that descends of the speed of response of drg.Therefore, in first embodiment,, can realize the high speed of drg speed of response simultaneously and prevent that collision sound from increasing by on-off element is carried out on.
Fig. 5 is the example of the electric current that flows through the drg winding among first embodiment, and the long and short dash line among the figure is represented current instruction value, and solid line represents that actual flow crosses the electric current of drg winding.In first embodiment,, vdc is increased by control, realize the fast speed build up time, after less level (for example the amplitude of winding current is i2 etc.), begin to carry out at collision sound, thus, can avoid winding current to increase considerably.And in general, therefore required electromagnetic force when the required electromagnetic force of brake plate that keeps being attracted is less than brake plate attracted, is attracted the back at brake plate and reduces current instruction value.Thus, when especially in high-lift express lift, using, can realize energy-conservationization.
Fig. 6 is the enlarged drawing of the part that partly surrounds of the with dashed lines of Fig. 5.In first embodiment, set current instruction value for value greater than the required winding electric flow valuve (minimum holding current) of the MIN electromagnetic force that produce to keep brake plate to use, for example, in that being connected in parallel, a plurality of drg windings are used as drg winding 10 when using, current instruction value set for the minimum holding current that is substantially equal to each drg winding and add value after the variable error part, and only when winding current is lower than current instruction value, make semiconductor switch 6 connect certain time interval T.In the control method of known semiconductor switch, employing compares command value and detected value, when the former is big, semiconductor switch is connected, and at the former hour, make the open circuited method of semiconductor switch, the method for perhaps using carrier wave to carry out the command value comparison and carry out the on/off action repeatedly., when adopting the former method, may cause near the number of times of the switch motion of semiconductor switch 6 boundary point to increase, thereby cause switching loss to increase.In addition, in the latter's method, if the frequency of carrier wave is lower, then may cause the amplitude of fluctuation of winding current to increase, thereby the situation of minimum holding current occurs being lower than, so generally must be than higher, still with frequency setting, after frequency improves, may cause the increase of switch number of times and switching loss is increased.In contrast to this, in first embodiment, because only when winding current is lower than current instruction value, make semiconductor switch 6 connect certain time interval T, so, except that control method is very simple, can also reduce the switch number of times, therefore have the effect that can reduce switching loss.
In first embodiment, to have adopted with 2 pairs of source of ACs of rectifying circuit 1 and carried out generating the structure of vdc after the rectification, but also can adopt the direct and smooth condenser bonded assembly structure of direct supply, also can access identical effect this moment.
Second embodiment
Fig. 7 is the elevator of the second embodiment of the present invention, is provided with voltage transformer 16 between the source of AC 1 of first embodiment that is characterized at Fig. 1 and the rectifying circuit 2 and insulate.In elevator device, general situation is the source of AC 1 of commercialization to be changed by voltage transformer 16 utilize after generating a plurality of voltages (for example power circuit voltage and control with voltage etc.).At this moment, because 2 sides of voltage transformer 16 are insulated, so general method is the negative side of smooth condenser 3 to be implemented the processing of ground connection etc. as bench mark.At this moment, under the state that the contact of the 1st electromagnetic contactor 7 and the 2nd electromagnetic contactor 4 is closed and semiconductor switch 6 is connected, an end of drg winding 10 equates with the current potential of bench mark.Being provided with aspect the position of current probe 8, when under the above-mentioned condition when earth fault has taken place in drg winding 10, having excessive short circuit current flows through, if current probe 8 is arranged between the anode-side and drg winding 10 as the diode 5 of the current potential of bench mark, then may detects less than short circuit current.Promptly, consider from the angle that helps the drg action, current probe 8 can be arranged between the cathode side and drg winding 10 of diode 5, also can be arranged between the anode-side and drg winding 10 of diode 5, but shown in second embodiment, between the cathode side and drg winding 10 of the diode 5 by being arranged on the current potential that is not bench mark, the short circuit current in the time of then can also detecting drg winding 10 earth fault has taken place is so have the effect that can improve safety.
In a second embodiment, during as bench mark, between the anode-side and drg winding 10 that current probe 8 are arranged on diode 5, can access identical effect at the side of the positive electrode that adopts smooth condenser 3.That is, can with current probe be provided with in the terminal that the position is arranged on drg winding 10 not between the terminal and diode 5 that are electrically connected with bench mark.In addition, self-evident, in a second embodiment, the part of source of AC 1, voltage transformer 16 and rectifying circuit 2 also can be a straight-though insulated type voltage source, at this moment, also can access identical effect.
Claims (6)
1. the brake equipment of an elevator, the brake equipment of this elevator comprises: alternating current is transformed to galvanic rectifying circuit; Be connected the smooth condenser of the mouth of described rectifying circuit; The diode that is connected in parallel with described smooth condenser and the circuit series of semiconductor switch; The drg winding that is connected in parallel with described diode; The drg that braking force changes according to the electromagnetic force of described drg winding; And the arithmetic processing apparatus that generates the control command of described semiconductor switch, the brake equipment of this elevator is characterised in that further to have:
Be arranged on the 1st electromagnetic contactor between described diode and the described drg winding;
Be arranged on the 2nd electromagnetic contactor between the circuit series of described smooth condenser and described diode and semiconductor switch.
2. the brake equipment of an elevator, the brake equipment of this elevator comprises: direct voltage source; Be connected the smooth condenser of the mouth of described direct voltage source; The diode that is connected in parallel with described smooth condenser and the circuit series of semiconductor switch; The drg winding that is connected in parallel with described diode; The drg that braking force changes according to the electromagnetic force of described drg winding; And the arithmetic processing apparatus that generates the control command of described semiconductor switch, the brake equipment of this elevator is characterised in that further to have:
Be arranged on the 1st electromagnetic contactor between described diode and the described drg winding;
Be arranged on the 2nd electromagnetic contactor between the circuit series of described smooth condenser and described diode and semiconductor switch.
3. as the brake equipment of claim 1 or 2 described elevators, it is characterized in that,
The rated capacity of the contact in described the 1st electromagnetic contactor is greater than the rated capacity of the contact in the 2nd electromagnetic contactor.
4. the brake equipment of elevator as claimed in claim 1 is characterized in that,
Normal in service when stopping to move, described arithmetic processing apparatus is output command under the contact closing state of described the 1st electromagnetic contactor, and exports the open instruction of the contact of the open command of described semiconductor switch and described the 2nd electromagnetic contactor.
5. the brake equipment of elevator as claimed in claim 1 is characterized in that,
Described the 1st electromagnetic contactor and described the 2nd electromagnetic contactor can be controlled the switch of contact by described arithmetic processing apparatus, and the contact of described the 1st electromagnetic contactor can be by opening the external device (ED) that detects unusually of elevator device.
6. the brake equipment of elevator as claimed in claim 1 is characterized in that,
In promptly stopping, carrying out improperly when stopping to move, make the contact of described the 1st electromagnetic contactor open, described semiconductor switch is disconnected, and make the contact of described the 2nd electromagnetic contactor open.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007212527 | 2007-08-17 | ||
| JP2007212527A JP5124206B2 (en) | 2007-08-17 | 2007-08-17 | Elevator brake equipment |
| JP2007-212527 | 2007-08-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101367479A true CN101367479A (en) | 2009-02-18 |
| CN101367479B CN101367479B (en) | 2012-07-04 |
Family
ID=40411515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102109412A Active CN101367479B (en) | 2007-08-17 | 2008-08-15 | Brake device of elevator |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5124206B2 (en) |
| CN (1) | CN101367479B (en) |
| HK (1) | HK1127896A1 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010100316A1 (en) * | 2009-03-05 | 2010-09-10 | Kone Corporation | Elevator system |
| CN102674194A (en) * | 2012-05-23 | 2012-09-19 | 佛山市顺德区金泰德胜电机有限公司 | Control circuit of elevator brake |
| CN103231957A (en) * | 2013-05-10 | 2013-08-07 | 恒达富士电梯有限公司 | Elevator brake system anti-sticking method and device |
| CN103842277A (en) * | 2011-10-06 | 2014-06-04 | 奥的斯电梯公司 | Elevator brake control |
| CN103888031A (en) * | 2014-03-07 | 2014-06-25 | 京东方科技集团股份有限公司 | Brake control circuit and motor system |
| CN104192750A (en) * | 2014-08-27 | 2014-12-10 | 安徽广德昌立制动器有限公司 | Universal type elevator brake voltage-regulating control circuit |
| CN104891377A (en) * | 2015-05-19 | 2015-09-09 | 上海德圣米高电梯有限公司 | Synchronous control system of double traction machine brakes |
| CN105429548A (en) * | 2014-09-10 | 2016-03-23 | 发那科株式会社 | Electric Motor Drive Apparatus Having Function For Detecting Welding Of Electromagnetic Contactor |
| CN109693986A (en) * | 2017-10-23 | 2019-04-30 | 上海三菱电梯有限公司 | The method for preventing elevator unexpecred braking |
| US10450162B2 (en) | 2015-06-29 | 2019-10-22 | Otis Elevator Company | Electromagnetic brake control circuitry for elevator application |
| CN110683434A (en) * | 2018-07-04 | 2020-01-14 | 通力股份公司 | Elevator with a movable elevator car |
| CN113942906A (en) * | 2020-07-16 | 2022-01-18 | 奥的斯电梯公司 | Elevator safety circuit |
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| JP5578901B2 (en) * | 2010-03-19 | 2014-08-27 | 東芝エレベータ株式会社 | Elevator brake control device |
| WO2012141713A1 (en) | 2011-04-15 | 2012-10-18 | Otis Elevator Company | Elevator drive power supply control |
| JP2012255468A (en) * | 2011-06-08 | 2012-12-27 | Try Tec Corp | Electromagnetic brake device and power supply circuit for brake |
| FI123348B (en) * | 2011-10-07 | 2013-02-28 | Kone Corp | Elevator control arrangement and method of elevator control |
| JP6072929B2 (en) * | 2013-09-27 | 2017-02-01 | 三菱電機株式会社 | Elevator control device |
| CN104210911B (en) * | 2014-08-22 | 2016-09-14 | 上海吉亿电机有限公司 | One can turn off formula elevator power supply and implementation method |
| DE102018128121A1 (en) * | 2018-11-09 | 2020-05-14 | Eaton Intelligent Power Limited | AC / DC conversion arrangement |
| CN217498548U (en) * | 2022-06-16 | 2022-09-27 | 苏州汇川控制技术有限公司 | Non-isolated safe band-type brake power supply for elevator and elevator equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0780650B2 (en) * | 1990-08-13 | 1995-08-30 | 日本オーチス・エレベータ株式会社 | Brake control system of elevator controller |
| JPH1025075A (en) * | 1996-07-09 | 1998-01-27 | Hitachi Ltd | Controller for linear motor type elevator |
| JP2001180875A (en) * | 1999-12-24 | 2001-07-03 | Hitachi Building Systems Co Ltd | Control device of driving apparatus having motor and braking machine |
| JP2003081543A (en) * | 2001-09-14 | 2003-03-19 | Toshiba Elevator Co Ltd | Brake control device for elevator |
| JP4774282B2 (en) * | 2005-11-30 | 2011-09-14 | 株式会社日立製作所 | Brake control device for elevator |
-
2007
- 2007-08-17 JP JP2007212527A patent/JP5124206B2/en active Active
-
2008
- 2008-08-15 CN CN2008102109412A patent/CN101367479B/en active Active
-
2009
- 2009-07-29 HK HK09106990.8A patent/HK1127896A1/en unknown
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102341332B (en) * | 2009-03-05 | 2015-05-20 | 通力股份公司 | Elevator system |
| CN102341332A (en) * | 2009-03-05 | 2012-02-01 | 通力股份公司 | Elevator system |
| US8235180B2 (en) | 2009-03-05 | 2012-08-07 | Kone Corporation | Elevator system with a brake control circuit using a controllable switch switched with short pulses |
| WO2010100316A1 (en) * | 2009-03-05 | 2010-09-10 | Kone Corporation | Elevator system |
| US9617117B2 (en) | 2011-10-06 | 2017-04-11 | Otis Elevator Company | Elevator brake control including a solid state switch in series with a relay switch |
| CN103842277A (en) * | 2011-10-06 | 2014-06-04 | 奥的斯电梯公司 | Elevator brake control |
| CN103842277B (en) * | 2011-10-06 | 2016-04-13 | 奥的斯电梯公司 | Elevator brake controls |
| CN102674194A (en) * | 2012-05-23 | 2012-09-19 | 佛山市顺德区金泰德胜电机有限公司 | Control circuit of elevator brake |
| CN103231957B (en) * | 2013-05-10 | 2015-12-09 | 恒达富士电梯有限公司 | A kind of antiseized linked method of elevator brake system and device |
| CN103231957A (en) * | 2013-05-10 | 2013-08-07 | 恒达富士电梯有限公司 | Elevator brake system anti-sticking method and device |
| CN103888031A (en) * | 2014-03-07 | 2014-06-25 | 京东方科技集团股份有限公司 | Brake control circuit and motor system |
| CN103888031B (en) * | 2014-03-07 | 2016-05-11 | 京东方科技集团股份有限公司 | A kind of brake control circuit and motor system |
| US9312793B2 (en) | 2014-03-07 | 2016-04-12 | Boe Technology Group Co., Ltd. | Brake control circuit and motor system |
| CN104192750B (en) * | 2014-08-27 | 2016-07-06 | 安徽广德昌立制动器有限公司 | Universal elevator brake voltage regulator control circuit |
| CN104192750A (en) * | 2014-08-27 | 2014-12-10 | 安徽广德昌立制动器有限公司 | Universal type elevator brake voltage-regulating control circuit |
| CN105429548A (en) * | 2014-09-10 | 2016-03-23 | 发那科株式会社 | Electric Motor Drive Apparatus Having Function For Detecting Welding Of Electromagnetic Contactor |
| CN104891377A (en) * | 2015-05-19 | 2015-09-09 | 上海德圣米高电梯有限公司 | Synchronous control system of double traction machine brakes |
| US10450162B2 (en) | 2015-06-29 | 2019-10-22 | Otis Elevator Company | Electromagnetic brake control circuitry for elevator application |
| CN109693986A (en) * | 2017-10-23 | 2019-04-30 | 上海三菱电梯有限公司 | The method for preventing elevator unexpecred braking |
| CN110683434A (en) * | 2018-07-04 | 2020-01-14 | 通力股份公司 | Elevator with a movable elevator car |
| CN110683434B (en) * | 2018-07-04 | 2023-09-29 | 通力股份公司 | Elevator with a motor |
| CN113942906A (en) * | 2020-07-16 | 2022-01-18 | 奥的斯电梯公司 | Elevator safety circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| HK1127896A1 (en) | 2009-10-09 |
| JP5124206B2 (en) | 2013-01-23 |
| CN101367479B (en) | 2012-07-04 |
| JP2009046231A (en) | 2009-03-05 |
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