CA2414998C - Method of stopping conveying equipment for persons - Google Patents
Method of stopping conveying equipment for persons Download PDFInfo
- Publication number
- CA2414998C CA2414998C CA2414998A CA2414998A CA2414998C CA 2414998 C CA2414998 C CA 2414998C CA 2414998 A CA2414998 A CA 2414998A CA 2414998 A CA2414998 A CA 2414998A CA 2414998 C CA2414998 C CA 2414998C
- Authority
- CA
- Canada
- Prior art keywords
- persons
- conveying equipment
- holding brake
- speed
- braking
- 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.)
- Expired - Lifetime
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B50/00—Energy efficient technologies in elevators, escalators and moving walkways, e.g. energy saving or recuperation technologies
Landscapes
- Escalators And Moving Walkways (AREA)
- Control Of Conveyors (AREA)
Abstract
The invention relates to a method for stopping conveying equipment for persons, which comprises a holding brake (3), wherein on response of the safety element a braking ramp (1) determined by a frequency converter (2) co-operating with a drive motor (4) is activated, by means of which the conveying equipment for persons is brought to a standstill, wherein the holding brake (3) is activated shortly before standstill. The operational safety of the braking system is thus increased.
Description
Method of stopping conveying equipment for persons The invention relates to a method for stopping conveying equipment for persons having a holding brake, a drive motor, a frequency converter controlling the operation of the drive motor and braking.
By conveying equipment for persons there are to be understood in this application not only escalators, but also moving walkways.
A method for braking rolling stairs or rolling walkways has become known from specification DE-19803899 C2, in which on response of the safety element a braking ramp is activated by way of which the speed of the step belt or plate belt is brought to the value 0 m/s. The holding brake is activated at the instant of standstill of the rolling stairs or the rolling walkway.
In this solution the holding brake does not have an ideal braking function.
This means that no friction braking takes place, which can lead to an unpredictable operational safety of the holding brake.
The invention has the object of proposing a method of the kind stated in the introduction which does not have the aforesaid disadvantages and which increases the operational safety of the holding brake.
The activation of the holding brake shortly before standstill of the conveying equipment for persons means that the holding brake is activated when the conveying equipment for persons is, in the case of retardation, still in motion, i.e. when the drive motor is not yet completely stopped. The holding brake is preferably activated at a speed of approximately 20% of the normal speed of the conveying equipment for persons so that a friction braking also takes place. This controlled activation of the holding brake increases the operational safety of the operating system.
Advantageously, the frequency converter is switched off only when the holding brake comes into effect. This has the advantage that there is no jerking of the motor, which can be an unpleasant acceleration and a disturbing noise for the passengers. A
stopping, which is optimised in that the manner, of the conveying equipment for persons increases travel comfort.
Advantageously, the holding brake is activated when the conveying equipment for persons has reached a speed of 0.1 m/s in the braking ramp. This has the advantage that the speed of the conveying equipment for persons is constantly monitored and the holding brake engages at the correct speed.
The invention further has the following advantages:
Due to the jerk free stopping of the motor, the drive system does not produce any unnecessary noise and is free of wear, whereby the service life of the components is increased.
In one aspect, the present invention provides a method for stopping conveying equipment for persons having a holding brake, a drive motor, a frequency converter controlling the operation of the drive motor and braking, and a holding brake, wherein on activation of a safety element the frequency converter decreases the speed of the drive motor according to a pre-established braking ramp, the holding brake being activated before standstill of the conveying equipment for persons.
In another aspect, the present invention provides a method for stopping conveying equipment for persons having a holding brake, a drive motor, a frequency converter controlling the operation of the drive motor and braking, and a holding brake, wherein on activation of a safety element the frequency converter decreases the speed of the drive motor according to a pre-established braking ramp, the holding brake being activated before standstill of the conveying equipment for persons, wherein the holding brake is activated when the conveying equipment for persons has decreased to a speed of at least 0.1 m/s; and wherein the frequency converter is switched off at or subsequent to the time when the holding brake is activated.
All explained features are usable not only in the respectively indicated combination, but also in other combinations or by themselves without departing from the scope of the invention.
2a Examples of embodiment of the invention are illustrated in schematic drawings and explained in more detail in the following description, in which:
Fig. 1 shows a graphical illustration of the speed behaviour during stopping of conveying equipment for persons and Fig. 2 shows a basic illustration of the braking system according to the invention.
Fig. 1 shows a graphical illustration of a load-independent braking of the step belt or plate belt of an escalator or a moving walkway. There are two kinds of braking, namely an electrical braking and a holding brake. Electrical braking is used for the operational braking wherein a drive motor 4 is braked by way of a frequency converter 2 over a set braking ramp 1. If the electrical braking is interrupted, then there is further braking by the holding brake 3. The holding brake 3 is an electromechanical brake, which preferably acts on the motor shaft in the drive motor 4 in mechanically positive manner. In the case of sole action of the holding brake 3, the brake travels defined in the applicable standards/guidelines are maintained.
The activation of the braking can take place by reason of an emergency stop or a fault response of a safety element. The speed v is indicated as a function of time t, wherein the normal speed of the conveying equipment for persons is denoted by vM. The braking ramp 1, which is activated by the frequency converter 2, defines a predetermined braking travel over a predetermined time t. The speed v of the conveying equipment for persons is thus brought to the value 0 m/s with a defined retardation. At the instant t0, the braking ramp 1 of the frequency converter 2 is activated and braked with substantially uniform deceleration. At the instant tl shortly before the stopping of the conveying equipment for persons, the holding brake 3 engages. This preferably happens at a minimum speed of 0.1 m/s, which corresponds with approximately 20% of the normal speed vN. The frequency converter 2 is switched off only when the holding brake has already initiated its action. The frequency converter is thus switched off when the motor 4 is already stopped.
This leads to significant advantages for operation of the motor. The switching-off of the frequency converter 2, in fact, usually does not take place linearly. Jerks occur, which can lead to undesired noise or damage to the gears or disturbance at the mains.
Figure 2 shows a basic illustration of a braking system according to one embodiment of the invention. The frequency converter 2 is connected with the motor 4 by way of switching elements 5. The energy supply 6 supplies the frequency converter 2, which is disposed in operative connection with a control unit 7. The control unit 7 is also disposed in operative connection with the switching elements 5 as well as with a brake magnet 8.
The monitoring of the safety elements, such as, for example, the safety circuit, takes place in the region of the control unit 7. The triggering of a safety element is detected by the control unit 7, which signals to the frequency converter 2 to initiate an electrical braking, i.e. a controlled, gentle braking process. Although the safety circuit is interrupted by the triggering of a safety element, the contacts of the switching elements 5 are kept closed, so that the frequency converter 2 can always act on the motor 4 during electrical braking.
The speed of the conveying equipment for persons is constantly measured. This can take place, for example, by a rotational speed pick-up of the motor 4. The holding brake 3 engages shortly before standstill of the conveying equipment for persons, preferably at a speed of 0.1 m/s.
By conveying equipment for persons there are to be understood in this application not only escalators, but also moving walkways.
A method for braking rolling stairs or rolling walkways has become known from specification DE-19803899 C2, in which on response of the safety element a braking ramp is activated by way of which the speed of the step belt or plate belt is brought to the value 0 m/s. The holding brake is activated at the instant of standstill of the rolling stairs or the rolling walkway.
In this solution the holding brake does not have an ideal braking function.
This means that no friction braking takes place, which can lead to an unpredictable operational safety of the holding brake.
The invention has the object of proposing a method of the kind stated in the introduction which does not have the aforesaid disadvantages and which increases the operational safety of the holding brake.
The activation of the holding brake shortly before standstill of the conveying equipment for persons means that the holding brake is activated when the conveying equipment for persons is, in the case of retardation, still in motion, i.e. when the drive motor is not yet completely stopped. The holding brake is preferably activated at a speed of approximately 20% of the normal speed of the conveying equipment for persons so that a friction braking also takes place. This controlled activation of the holding brake increases the operational safety of the operating system.
Advantageously, the frequency converter is switched off only when the holding brake comes into effect. This has the advantage that there is no jerking of the motor, which can be an unpleasant acceleration and a disturbing noise for the passengers. A
stopping, which is optimised in that the manner, of the conveying equipment for persons increases travel comfort.
Advantageously, the holding brake is activated when the conveying equipment for persons has reached a speed of 0.1 m/s in the braking ramp. This has the advantage that the speed of the conveying equipment for persons is constantly monitored and the holding brake engages at the correct speed.
The invention further has the following advantages:
Due to the jerk free stopping of the motor, the drive system does not produce any unnecessary noise and is free of wear, whereby the service life of the components is increased.
In one aspect, the present invention provides a method for stopping conveying equipment for persons having a holding brake, a drive motor, a frequency converter controlling the operation of the drive motor and braking, and a holding brake, wherein on activation of a safety element the frequency converter decreases the speed of the drive motor according to a pre-established braking ramp, the holding brake being activated before standstill of the conveying equipment for persons.
In another aspect, the present invention provides a method for stopping conveying equipment for persons having a holding brake, a drive motor, a frequency converter controlling the operation of the drive motor and braking, and a holding brake, wherein on activation of a safety element the frequency converter decreases the speed of the drive motor according to a pre-established braking ramp, the holding brake being activated before standstill of the conveying equipment for persons, wherein the holding brake is activated when the conveying equipment for persons has decreased to a speed of at least 0.1 m/s; and wherein the frequency converter is switched off at or subsequent to the time when the holding brake is activated.
All explained features are usable not only in the respectively indicated combination, but also in other combinations or by themselves without departing from the scope of the invention.
2a Examples of embodiment of the invention are illustrated in schematic drawings and explained in more detail in the following description, in which:
Fig. 1 shows a graphical illustration of the speed behaviour during stopping of conveying equipment for persons and Fig. 2 shows a basic illustration of the braking system according to the invention.
Fig. 1 shows a graphical illustration of a load-independent braking of the step belt or plate belt of an escalator or a moving walkway. There are two kinds of braking, namely an electrical braking and a holding brake. Electrical braking is used for the operational braking wherein a drive motor 4 is braked by way of a frequency converter 2 over a set braking ramp 1. If the electrical braking is interrupted, then there is further braking by the holding brake 3. The holding brake 3 is an electromechanical brake, which preferably acts on the motor shaft in the drive motor 4 in mechanically positive manner. In the case of sole action of the holding brake 3, the brake travels defined in the applicable standards/guidelines are maintained.
The activation of the braking can take place by reason of an emergency stop or a fault response of a safety element. The speed v is indicated as a function of time t, wherein the normal speed of the conveying equipment for persons is denoted by vM. The braking ramp 1, which is activated by the frequency converter 2, defines a predetermined braking travel over a predetermined time t. The speed v of the conveying equipment for persons is thus brought to the value 0 m/s with a defined retardation. At the instant t0, the braking ramp 1 of the frequency converter 2 is activated and braked with substantially uniform deceleration. At the instant tl shortly before the stopping of the conveying equipment for persons, the holding brake 3 engages. This preferably happens at a minimum speed of 0.1 m/s, which corresponds with approximately 20% of the normal speed vN. The frequency converter 2 is switched off only when the holding brake has already initiated its action. The frequency converter is thus switched off when the motor 4 is already stopped.
This leads to significant advantages for operation of the motor. The switching-off of the frequency converter 2, in fact, usually does not take place linearly. Jerks occur, which can lead to undesired noise or damage to the gears or disturbance at the mains.
Figure 2 shows a basic illustration of a braking system according to one embodiment of the invention. The frequency converter 2 is connected with the motor 4 by way of switching elements 5. The energy supply 6 supplies the frequency converter 2, which is disposed in operative connection with a control unit 7. The control unit 7 is also disposed in operative connection with the switching elements 5 as well as with a brake magnet 8.
The monitoring of the safety elements, such as, for example, the safety circuit, takes place in the region of the control unit 7. The triggering of a safety element is detected by the control unit 7, which signals to the frequency converter 2 to initiate an electrical braking, i.e. a controlled, gentle braking process. Although the safety circuit is interrupted by the triggering of a safety element, the contacts of the switching elements 5 are kept closed, so that the frequency converter 2 can always act on the motor 4 during electrical braking.
The speed of the conveying equipment for persons is constantly measured. This can take place, for example, by a rotational speed pick-up of the motor 4. The holding brake 3 engages shortly before standstill of the conveying equipment for persons, preferably at a speed of 0.1 m/s.
Claims (3)
1. A method for stopping conveying equipment for persons having a holding brake, a drive motor, a frequency converter controlling the operation of the drive motor and braking, and a holding brake, wherein on activation of a safety element the frequency converter decreases the speed of the drive motor according to a pre-established braking ramp, the holding brake being activated before standstill of the conveying equipment for persons, wherein the holding brake is activated when the conveying equipment for persons has decreased to a speed of at least 0.1 m/s; and wherein the frequency converter is switched off at or subsequent to the time when the holding brake is activated.
2. The method according to claim 1, wherein the speed of the conveying equipment for persons is constantly measured while the speed of the drive motor is being decreased.
3. The method according to claim 1 or claim 2, wherein the holding brake is activated when the speed of the conveying equipment for persons has decreased to about 20% of the normal speed of the conveying equipment for persons.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01811268 | 2001-12-24 | ||
| EP01811268.0 | 2001-12-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2414998A1 CA2414998A1 (en) | 2003-06-24 |
| CA2414998C true CA2414998C (en) | 2011-08-09 |
Family
ID=8184338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2414998A Expired - Lifetime CA2414998C (en) | 2001-12-24 | 2002-12-20 | Method of stopping conveying equipment for persons |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1216789C (en) |
| BR (1) | BR0205421B1 (en) |
| CA (1) | CA2414998C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4267643B2 (en) * | 2006-06-28 | 2009-05-27 | 株式会社日立製作所 | Passenger conveyor |
| FI119508B (en) * | 2007-04-03 | 2008-12-15 | Kone Corp | Fail safe power control equipment |
| WO2014198545A1 (en) * | 2013-06-13 | 2014-12-18 | Inventio Ag | Braking method for a passenger transport system, brake control for carrying out the braking method and passenger transport system having a brake control |
| CN109279485A (en) * | 2018-10-24 | 2019-01-29 | 苏州威倍科动力科技有限公司 | Control method for the braking of the power loss of escalator and moving sidewalk |
-
2002
- 2002-12-12 CN CN02155946.5A patent/CN1216789C/en not_active Expired - Fee Related
- 2002-12-20 CA CA2414998A patent/CA2414998C/en not_active Expired - Lifetime
- 2002-12-20 BR BRPI0205421-3A patent/BR0205421B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| BR0205421B1 (en) | 2010-12-28 |
| CN1216789C (en) | 2005-08-31 |
| CN1428288A (en) | 2003-07-09 |
| CA2414998A1 (en) | 2003-06-24 |
| BR0205421A (en) | 2004-08-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20221220 |