CN211366651U - Remote status monitoring system for fan of elevator - Google Patents
Remote status monitoring system for fan of elevator Download PDFInfo
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- CN211366651U CN211366651U CN201921696015.0U CN201921696015U CN211366651U CN 211366651 U CN211366651 U CN 211366651U CN 201921696015 U CN201921696015 U CN 201921696015U CN 211366651 U CN211366651 U CN 211366651U
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Abstract
The utility model provides a remote status monitoring system for fan of elevator, the fan is arranged in cooling the appointed equipment in the elevator, remote status monitoring system includes: the fan control system comprises a control device, a transmission and processing device and a remote server, wherein the control device applies a control reference value to the fan to drive the fan to rotate so as to obtain a speed reference value of the fan under the control reference value, at least one of the control reference value and the speed reference value can be selected as a state key performance index of the fan, the transmission and processing device can receive and process the state key performance index so as to obtain state data of the fan, and then the transmission and processing device can send the state data to the remote server for state monitoring analysis, so that maintenance operation suggestions related to fan replacement are provided for technicians before functional faults occur or users notice performance problems.
Description
Technical Field
The utility model relates to an elevator or automatic escalator field, specifically, the utility model relates to a remote status monitoring system for elevator or automatic escalator's fan.
Background
Cloud connectivity for new generation drives enables remote status monitoring based on status based maintenance (CBM). The present invention uses this technique to remotely monitor the status of a fan (e.g., the cooling fan of a drive) in an elevator or escalator. The system can be used in products using the KDX driver family.
Early solutions were based on fan speed monitoring limits. If the fan speed is below a specified monitoring limit, an alarm/warning may be issued. On the next maintenance visit, the fan fault code is seen and the operation of replacing the fan is initiated. If the fan has reached its useful life before the next maintenance visit, the drive issues an overheating warning and limits the elevator performance (ED%). In the worst case, the drive trips to an over-temperature fault to protect and cause an undesirable quick stop.
SUMMERY OF THE UTILITY MODEL
Drive cooling fans have a limited useful life and it is likely that a new fan will need to be replaced before the drive life is over. Use the utility model provides a system can carry out preventive maintenance based on fan state key performance index (cKPI, condition key performance Indicator), and this index can indicate driver cooling fan's performance to weaken and/or the state variation.
To this end, in one aspect, the present invention provides a remote status monitoring system for a fan of an elevator, the fan being used for cooling a designated device in the elevator, the remote status monitoring system comprising: the fan control system comprises a control device, a transmission and processing device and a remote server, wherein the control device applies a control reference value to the fan to drive the fan to rotate so as to obtain a speed reference value of the fan under the control reference value, at least one of the control reference value and the speed reference value can be selected as a state key performance index of the fan, the transmission and processing device can receive and process the state key performance index so as to obtain state data of the fan, and then the transmission and processing device can send the state data to the remote server for state monitoring analysis, so that maintenance operation suggestions related to fan replacement are provided for technicians before functional faults occur or users notice performance problems.
According to a preferred embodiment, said control reference value is a value of a voltage applied to the fan.
According to a preferred embodiment, said control reference value is a value of a voltage modulated using a Pulse Width Modulation (PWM) technique.
According to a preferred embodiment, the remote condition monitoring system further comprises a temperature sensor (NTC, for example a thermistor of the negative temperature coefficient type) for obtaining the temperature of a given device; the control means may be capable of turning off the fan and stopping the fan state monitoring operation when the temperature obtained from the temperature sensor is less than a first threshold value; the control device is capable of initiating a state monitoring operation when the temperature obtained from the temperature sensor is greater than a first threshold value and less than a second threshold value (the second threshold value is greater than the first threshold value), and is capable of determining an appropriate control reference value based on a difference between the measured temperature and the first threshold value and a predetermined coefficient; the control means is capable of applying a maximum control reference value to the fan when the temperature obtained from the temperature sensor is greater than the second threshold value.
The condition monitoring test can be performed regularly, e.g. every day, when the elevator is in an idle state, e.g. at night, without the equipment specified in the elevator needing active cooling using a fan and without temperature measurement.
According to a preferred embodiment, before applying the control reference, the control means are able to control the fan to carry out an initialization procedure to drive the fan up to the nominal speed and to give an audible indication of valid operation.
According to a preferred embodiment, in case the control reference value is constant, the speed reference value is taken as a state-critical performance indicator.
According to a preferred embodiment, the control reference value is a PWM output having a substantially constant duty cycle.
According to a preferred embodiment, in case the speed reference value is constant, the control reference value is taken as a state-critical performance indicator.
According to a preferred embodiment, the remote server is a cloud server or a local server.
According to a preferred embodiment, the transmission and processing means comprise one or more of the following: serial interface, diagnostic framework software, electrified central processing unit.
According to a preferred embodiment, the fan in the elevator is one of the following: elevator car ventilation system fan, elevator motor fan, elevator converter fan, elevator driver fan, escalator motor fan, escalator converter fan, escalator driver fan.
On the other hand, the utility model also provides an elevator, include according to preceding the remote status monitoring system.
Drawings
The above and other features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, and the following description and drawings are given for illustrative purposes only, and do not limit the scope of the present invention in any way, wherein:
FIG. 1 illustrates a flow diagram for remote status monitoring of a cooling fan;
fig. 2 shows a typical cooling fan speed versus voltage graph.
Detailed Description
The foregoing and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the embodiments with reference to the accompanying drawings. The following description contains various specific details to aid in this understanding, but these details should be construed as merely exemplary. Moreover, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.
Throughout the description and claims of this specification, the word "comprise", and variations such as "comprises" and "comprising", means "including but not limited to", and is not intended to exclude other components, integers or steps. It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. In the present application, the expression "or" encompasses any and all combinations of the words listed together. In addition, although various elements of the present invention may be described using expressions such as "first" and "second," they are not intended to limit the corresponding elements. The above expressions are not intended to limit the order or importance of the corresponding elements. The above description is intended to distinguish one element from another, and "a first element" may be written as "a second element", and similarly "a second element" may be written as "a first element", without departing from the scope of the present invention.
The principle of the remote status monitoring system for the fan of the elevator provided by the present invention is described below with reference to the accompanying drawings.
After the control software is powered on, the cooling fan has an initialization sequence. First, the cooling fan is started to a rated speed in order to remove dust and give an audible indication of efficient operation. After this, the fan is given a 50% PWM reference value (which is an example value only, but could be other values that rotate the fan in a known manner), and the resulting fan speed (percentage of rated speed) after the transient is averaged and sampled, see fig. 1.
In one embodiment, the fan has no speed control, but the control method used is feed forward, i.e. no speed feedback of the cooling fan is utilized, so that when the control reference (e.g. 50% PWM voltage to the cooling fan) is kept constant, the resulting actual speed of the cooling fan is reduced by the extra friction caused by worn ball bearings or dust etc. Thus, this deviation in resulting speed over time is indicative of cooling fan status and performance level.
The averaged cooling fan speed, for example 50% PWM reference, is used as a state critical performance indicator (cKPI), which is transmitted to the flux Controller and the electrical Central Processing Unit (KCECPU) through the flux driver serial interface (KDSI) using a Diagnostic Framework (DF) routine for KPI transmission. The Diagnostics Framework (DF) processes incoming cKPI samples and transmits them to the cloud for data analysis (status diagnostics and prognostics and service demand creation process), and technicians obtain maintenance operation recommendations related to cooling fan replacement before functional failures occur.
Thus, in the case where the control reference value is constant, the speed reference value is regarded as the state-critical performance index.
In the controller flow shown in fig. 1, if the temperature is below 40 degrees celsius, the fan monitoring is turned off. If the temperature is between 40 and 59 degrees Celsius then: calculating an error value (measured temperature minus target value (40 degrees celsius)) and multiplying the error value by a coefficient (0.05) to obtain a suitable control value for voltage control; turning on the fan; the fan is turned on for monitoring. If the temperature is above 59 degrees Celsius then: the fan voltage is set to a maximum value (100% PWM).
Another embodiment is a cooling fan with speed control. Given as a speed reference 50% (for example only) of the nominal fan speed, and after the actual speed has stabilized to 50% of the nominal value, the resulting control reference (PWM voltage) is averaged/filtered and sampled as a state critical performance indicator (cKPI), named "cooling fan control force at 50% speed".
Therefore, in the case where the speed reference value is constant, the control reference value is regarded as the state-critical performance index.
A typical cooling fan speed versus voltage curve is shown in fig. 2.
The aforementioned Diagnostic Framework (DF) is a software running in the elevator controller, but it can be run in a separate/other controller or computer. Generally, the controller receives and samples fan speed signals (example 1) or fan voltage (example 2), processes (stores, filters, averages, etc.) the signals, calculates status data, and sends the status data to a remote (cloud or local) server for preventative status monitoring analysis. Based on the analysis, maintenance operations (instant service calls, component replacement on next service visit, next service visit investigation, etc.) are initiated.
The utility model provides a system has realized driver cooling fan state remote monitoring, and before functional failure takes place or the user notices the performance problem, it provides the analysis data to change the fan at why. The system can be applied to a universal force KDX driver product.
The utility model provides a status monitoring analysis can also provide the information about the future maintenance access schedule.
It will be appreciated by those skilled in the art that the above system has wide application in elevator car ventilation system fans, elevator motor fans, elevator inverter/drive fans, escalator motor fans, and escalator inverter/drive fans.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention, which is defined by the appended claims. It will be appreciated by persons skilled in the art that variations and modifications may be made to the various embodiments described herein without departing from the scope of the invention as defined by the appended claims. Moreover, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.
Finally, it is also to be understood that certain features of the embodiments may not be necessary to solve a particular technical problem, and thus may be absent or omitted without affecting the solution of the technical problem or the formation of a technical solution; furthermore, the features, elements, and/or functions of one embodiment may be combined, coupled, or coordinated with the features, elements, and/or functions of one or more other embodiments as appropriate, unless the combination, coupling, or coordination is clearly not practical.
Claims (12)
1. A remote condition monitoring system for a fan of an elevator, which fan is used for cooling a designated device in the elevator, characterized in that the remote condition monitoring system comprises:
a control device for applying a control reference value to the fan to drive the fan to rotate so as to obtain a speed reference value of the fan under the control reference value,
a transmission and processing device, at least one of the control reference value and the speed reference value being selectable as a status key performance indicator for the fan, the transmission and processing device being capable of receiving and processing the status key performance indicator to obtain status data for the fan, and then capable of sending the status data to a remote server for status monitoring analysis, thereby providing a technician with a repair action recommendation relating to fan replacement before a functional failure occurs or before a user notices a performance issue.
2. The remote condition monitoring system according to claim 1, wherein the control reference value is a voltage value applied to a fan.
3. The remote condition monitoring system according to claim 1, wherein the control reference value is a value of a voltage modulated using a Pulse Width Modulation (PWM) technique.
4. The remote condition monitoring system of claim 1, further comprising a temperature sensor for obtaining a temperature of a given device;
the control means may be capable of turning off the fan and stopping the fan state monitoring operation when the temperature obtained from the temperature sensor is less than a first threshold value;
the control means is capable of initiating a condition monitoring operation when the temperature obtained from the temperature sensor is greater than a first threshold value and less than a second threshold value, which is greater than the first threshold value, and determining an appropriate control reference value based on a difference between the measured temperature and the first threshold value and a predetermined coefficient;
the control means is capable of applying a maximum control reference value to the fan when the temperature obtained from the temperature sensor is greater than the second threshold value.
5. The remote condition monitoring system according to claim 1, wherein the control means is capable of controlling the fan to perform an initialization procedure to drive the fan to a rated speed and to give an audible indication of valid operation before applying the control reference value.
6. The remote status monitoring system according to claim 1, wherein in a case where the control reference value is constant, the speed reference value is regarded as the status critical performance index.
7. The remote condition monitoring system of claim 6, wherein the control reference value is a PWM output having a substantially constant duty cycle.
8. The remote status monitoring system according to claim 1, wherein in a case where the speed reference value is constant, the control reference value is regarded as the status-critical performance index.
9. The remote condition monitoring system according to any one of claims 1 to 8, wherein the remote server is a cloud server or a local server.
10. The remote condition monitoring system according to any one of claims 1 to 8, wherein the transmission and processing means comprises one or more of: serial interface, diagnostic framework software, electrified central processing unit.
11. The remote condition monitoring system according to any one of claims 1 to 8, wherein the fan in the elevator is one of: elevator car ventilation system fan, elevator motor fan, elevator converter fan, elevator driver fan, escalator motor fan, escalator converter fan, escalator driver fan.
12. Elevator, characterized in that it comprises a remote status monitoring system according to any of claims 1-11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921696015.0U CN211366651U (en) | 2019-10-11 | 2019-10-11 | Remote status monitoring system for fan of elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921696015.0U CN211366651U (en) | 2019-10-11 | 2019-10-11 | Remote status monitoring system for fan of elevator |
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| Publication Number | Publication Date |
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| CN211366651U true CN211366651U (en) | 2020-08-28 |
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| CN201921696015.0U Active CN211366651U (en) | 2019-10-11 | 2019-10-11 | Remote status monitoring system for fan of elevator |
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