Method and system for monitoring running state of cooling fan of traction motor

Abstract

The invention provides a system for monitoring the operation state of a traction motor cooling fan, the cooling fan comprises one or more fans, and the cooling system comprises a current detection component used for detecting the current transmitted to the fan by a power supply; the controller is used for comparing the detected current with a minimum threshold value or a maximum threshold value and generating a prompt signal when the detected current is smaller than the minimum threshold value or larger than the maximum threshold value; and the output component is used for outputting the generated prompt signal. The invention further provides a corresponding method and an application system.

Description

Technical Field

[0001] The present application relates to technologies related to traction motors, and more specifically, to technologies for monitoring the operating status of a cooling fan of a traction motor. Background Art

[0002] Traction motors are usually equipped with a heat dissipation device for reducing the motor temperature during motor operation, such as a heat dissipation fan installed on the heat dissipation ribs of the traction motor. Once the heat dissipation fan is abnormal, it will directly affect the heat dissipation effect on the motor, and then affect the operation of the motor. Therefore, it is necessary to monitor the operating status of the heat dissipation fan. Summary of the invention

[0003] The present application provides a method for monitoring the operating status of a cooling fan of a traction motor, wherein the cooling fan includes one or more fans, and the method may include: detecting the current delivered to the fan by a current detection component; when the detected current is less than a minimum threshold or greater than a maximum threshold, outputting a prompt signal; wherein the minimum threshold is set according to the open-circuit current of the fan, and the maximum threshold is set according to the short-circuit current of the fan.

[0004] For example, in the method, when the heat dissipation fan includes a plurality of fans, the plurality of fans are arranged to be connected to the power supply in parallel; and the current detection component detects the current delivered to the fan by the power supply, including: the current detection component detects the total current delivered to the plurality of fans in parallel by the power supply. Alternatively, a current detection component is provided for each of the plurality of fans to detect the current of each of the fans.

[0005] Illustratively, in the method, detecting the current delivered to the fan by the current detection component includes detecting the current delivered to the fan by the power supply by the current detection component after the fan is started for a period of time T.

[0006] According to another aspect of the present application, a system for monitoring the operating status of a traction motor cooling fan is also provided, wherein the cooling fan includes one or more fans, and the cooling system includes: a current detection component, which is used to detect the current delivered to the fan by a power supply; a controller, which is used to compare the detected current with a minimum threshold or a maximum threshold, and generate a prompt signal when the detected current is less than the minimum threshold or greater than the maximum threshold; an output component, which is used to output the generated prompt signal.

[0007] For example, in the system, when the heat dissipation fan includes a plurality of fans, the plurality of fans are connected to the power supply in parallel, and the current detection component detects the total current delivered by the power supply to the plurality of fans in parallel.

[0008] For example, in the system, when the cooling fan includes multiple fans, the multiple fans are connected to the power supply in parallel, and the current detection component is configured to detect the current of each of the multiple fans.

[0009] For example, in the system, the system further comprises a switch component for controlling the current detection component to be turned on. For example, the current detection component is a current sensor.

[0010] By way of example, in the system, the traction motor is a traction motor of an elevator, and the controller is configured to obtain a temperature value from a temperature detection component of the traction motor, and to stop the traction motor when the obtained temperature value is greater than a temperature threshold and when the detected current is less than a minimum threshold or greater than a maximum threshold.

[0011] According to another aspect of the present application, a traction motor for an elevator is also provided, which includes any one of the systems for monitoring the operating status of a cooling fan of a traction motor described herein.

[0012] According to another aspect of the present application, an application system for elevator maintenance is also provided, which is arranged in an electronic device, and the application system is implemented as one or more program instructions. When the one or more program instructions are executed by the electronic device: a prompt signal for indicating the operating status of a cooling fan of a traction motor of an elevator is received through a communication interface of the electronic terminal, wherein the prompt signal is a prompt signal outputted by any one of the systems for monitoring the operating status of a cooling fan of a traction motor described above, or a prompt signal outputted by executing any one of the methods described above; and the prompt signal is outputted by an output component of the electronic device; the output component includes one or both of a display screen and a voice. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present application will be more fully understood by referring to the following detailed description of specific embodiments in conjunction with the accompanying drawings, wherein:

[0014] Figure 1 is a structural schematic diagram of a system 1 for monitoring the operating status of a traction motor cooling fan according to an example of the present application;

[0015] Figure 2 is a structural schematic diagram of a system for monitoring the operating status of a cooling fan of a traction motor according to a specific embodiment of the present application;

[0016] Figure 3 is a flow chart of a method for monitoring the operating status of a cooling fan of a traction motor according to an example of the present application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings to clearly and completely describe the implementation methods of the present application. It should be noted that the described implementation methods are only partial implementation methods of the technical solutions of the present application, not all. All other implementation methods obtained by ordinary technicians in this field based on the implementation methods recorded in the application documents without paying creative work are covered by the protection scope of the present application.

[0018] The terms "first", "second", etc. in the specification, claims and drawings of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than the embodiments illustrated or described herein. In addition, "first" and "second" are used for descriptive purposes only and are not to be understood as expressly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, unless otherwise stated, "multiple" means two or more.

[0019] As used hereinafter, the words “example” or “exemplarily” or “exemplarily” mean “serving as an example, embodiment, or illustration.” Any embodiment described as “example” or “exemplarily” or “exemplarily” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0020] Figure 1 1 is a schematic diagram of a system 1 for monitoring the operating status of a cooling fan of a traction motor according to an example of the present application. Figure 1 As shown, the system for monitoring the operating status of a cooling fan of a traction motor (hereinafter also referred to as a monitoring system 1 ) includes a fan 12 , a current detection component 14 , a controller 16 and an output component 18 .

[0021] The fan 12 includes one or more fans for dissipating heat for the traction motor 2. Some embodiments of the present application below are described by taking a plurality of fans as an example. The power supply 10 supplies power to the fan 12, and the power supply 10 may be a battery or AC power. The current detection component 14 is configured to detect the current delivered to the fan 12 by the power supply 10. The controller 16 compares the current detected by the current detection component 14 with the minimum threshold and the maximum threshold, and generates a prompt signal when the detected current is less than the minimum threshold or greater than the maximum threshold. The prompt signal is output by the output component 18 so that the situation where the current input to the fan is less than the minimum threshold or greater than the maximum threshold can be known.

[0022] Taking the traction motor used in the elevator as an example, the traction motor 2 is usually provided with a thermistor for sensing the motor temperature. When the motor temperature is too high, the motor controller will implement appropriate operations to prevent the motor from operating abnormally or being damaged due to the high temperature. However, this method mainly detects the temperature of the motor and does not directly detect the operating status of the cooling fan. This makes it impossible to detect in time the abnormality of the cooling fan and the inability to dissipate heat normally.

[0023] Reference Figure 1 Once a short circuit occurs in the circuit of any one of the multiple fans, the current flowing through the circuit 1210 will increase; once a break occurs in the circuit of any one of the multiple fans, the current flowing through the circuit 1210 will decrease, wherein the circuit 1210 is the circuit through which the power supply 10 transmits current to the fan 12.

[0024] According to the monitoring system 1 of the present application example, the controller 16 determines whether the current delivered by the power supply 10 to the fan 12 is between the minimum threshold and the maximum threshold according to the preset maximum threshold and minimum threshold. For example, the maximum threshold is determined according to the current delivered by the power supply 10 to the fan 12 when a short circuit occurs in the fan (referred to as the short-circuit current herein), for example, the maximum threshold is slightly less than the short-circuit current; the minimum threshold is determined according to the current delivered by the power supply 10 to the fan 12 when a short circuit occurs in the fan (referred to as the open-circuit current herein), for example, the minimum threshold is slightly greater than the open-circuit current.

[0025] In this way, when the current flowing through the line 1210 detected by the current detection component 14 is greater than the minimum threshold and less than the maximum threshold, it indicates that the fan is operating normally. If the current detected by the current detection component 14 is less than the minimum threshold, it indicates that the fan may be short-circuited; if the detected current is greater than the maximum threshold, it indicates that the fan may be short-circuited. According to the example of the present application, the controller 16 generates a prompt signal when the current detected by the current detection component 14 is less than the minimum threshold; the controller 16 also generates a prompt signal when the current detected by the current detection component 14 is greater than the maximum threshold. The prompt signal is output by the output component 18 of the monitoring system 1, which enables maintenance personnel to timely understand the operating status of the fan based on the current input to the fan by the power supply, so as to timely inspect and maintain the heat dissipation system. For a traction motor that is not provided with the monitoring system 1 according to the example of the present application, when the fan is short-circuited or short-circuited, it is impossible to promptly inform the outside world of these abnormalities of the fan. When the outside world understands these abnormalities, it is usually because the motor has been operating abnormally due to poor heat dissipation due to fan failure. The abnormal operation of the traction motor may have caused the elevator and other equipment using the traction motor to stop operating. In contrast, when the monitoring system according to the example of the present application is used, a prompt signal is sent when the fan may be short-circuited or open-circuited, so that maintenance personnel can promptly inspect and maintain the traction motor to avoid the motor from stopping running or failing due to overheating.

[0026] According to some examples of the present application, the current detection component 14 may be a current sensor. Alternatively, the current detection component 14 may also be configured as a current detection circuit.

[0027] According to some embodiments of the present application, a plurality of fans 12 provided on the traction motor 2 are connected in parallel to the power supply 10, and the current detection component 14 detects the total current input from the power supply 10 to the parallel fans 12, that is, the current detected by the current detection component 14 is the sum of the currents input to each fan. In some alternative examples, the current detection component 14 is configured to detect the current of each fan, for example, a current sensor is provided for each fan to sense the current of the fan. In this alternative example, a maximum threshold and a minimum threshold of the current may be set for each fan; or as described above in the present application, a maximum threshold and a minimum threshold are set for the current passing through the line 1210, and the currents of each fan detected are summed and then compared with the maximum threshold or the minimum threshold.

[0028] According to some embodiments of the present application, the monitoring system 1 also includes a switching device 15, which is used to control the opening of the current detection component 14. For example, the switching device 15 is a relay, which is configured to be turned on after the fan 12 is started for a period of T, so that the current detection component 14 is electrically connected to the fan to detect the current delivered to the fan 12 by the power supply 10. Generally speaking, during the fan startup process, the current is relatively large. By setting a switching device such as a relay, the current detection component 14 can be controlled to detect the current after the fan enters the normal operating state from the startup state 5, so as to avoid the current detection component 14 from mistakenly generating a prompt signal due to the relatively large starting current when the fan is started. The value of T can be set corresponding to the time taken to start the fan, and the T period is, for example, a few seconds.

[0029] Figure 2 The present invention is a schematic diagram of a system for monitoring the operating state of a cooling fan of a traction motor according to a specific embodiment of the present invention, wherein the traction motor is a traction motor for an elevator, the current detection component is a current sensor, and the switch device is a relay. In this example, the cooling fan is arranged on the cooling ribs of the traction motor, and one fan is arranged on each of the four cooling ribs of the traction motor.

[0030] like Figure 2As shown, the traction motor 2 is provided with four fans 120, 121, 122 and 123 connected in parallel to the power supply 10, and the power supply 10 is connected through the line 1220. The four fans 120, 121, 122 and 123 are respectively arranged on the four heat dissipation ribs of the traction motor of the elevator. After starting, they blow air to the stator of the motor to reduce the temperature. In the example of the present application, the current sensor 14 is connected to the line 1210 through the relay 15, so as to sense the current on the line 1210 after the relay 15 is turned on, that is, to sense the total current flowing into the four fans 120, 121, 122 and 123.

[0031] After the fans 120, 121, 122 and 123 of the monitoring system 1 are started, that is, after being powered on for a period of T, the relay 15 connects the current sensor 14 to the line 1210, so that the current sensor 14 can sense the current passing through the line 1210, thereby obtaining the detection current. The controller 16 compares the current detected by the current sensor 14 with the minimum threshold and the maximum threshold, and generates a prompt signal when the detected current is less than the minimum threshold or greater than the maximum threshold. The output component 18 sends the generated prompt signal so that the terminal of the maintenance personnel, the computer in the control room, or the remote server and other electronic devices that receive the prompt signal as needed receive the prompt signal. In this way, when the fan may be abnormal, the maintenance personnel can be informed of the information in time, and take measures such as inspection and maintenance as early as possible, thereby ensuring the normal operation of the fan, thereby avoiding the traction motor and the elevator from operating abnormally due to the abnormal fan.

[0032] According to various examples of the present application, the controller 16 is also configured to obtain the temperature of the motor from the temperature sensing component of the traction motor. The controller 16 compares the obtained motor temperature with a preset temperature threshold. If the obtained motor temperature is greater than the temperature threshold, the controller 16 may issue a prompt signal indicating that the motor temperature is high. Further, the controller 16 controls the traction motor to stop running when the obtained motor temperature is greater than the temperature threshold and the current detected by the current sensor 14 is less than the minimum threshold or greater than the maximum threshold. As an example, the temperature threshold is less than the temperature that causes the thermistor to operate.

[0033] Figure 3 It is a flow chart of a method for monitoring the operating status of a cooling fan of a traction motor according to an example of the present application. The traction motor is provided with one or more fans. In step S301, the current delivered to the fan by the current detection component is detected. In step S302, when the detected current is less than a minimum threshold or greater than a maximum threshold, a prompt signal is output. The fan is, for example, arranged on a cooling rib of the traction motor, and the power supply is a battery or AC power for providing power to the fan. The current detection component can be implemented as a current acquisition circuit to acquire the current input from the power supply to the fan. Alternatively, the current detection component can also be a current sensor.

[0034] In some embodiments of the present application, there are multiple fans and the multiple fans are connected to a power supply in parallel, and the total current input from the power supply to the parallel fans is detected by a current detection component. In some alternative or supplementary examples, the current of each fan can be detected.

[0035] In a further embodiment of the present application, according to the method for monitoring the operating state of the cooling fan of the traction motor exemplified in the present application, after the fan is started, the current detection component detects the current of the fan, as shown in step S300 indicated by the dotted line. For example, within the time period T after the fan is powered on, the current from the power supply to the fan is detected, and the time period T may be greater than or equal to the startup time of the fan.

[0036] Figure 3 The exemplary method for monitoring the operating state of the cooling fan of the traction motor can be combined with the above Figure 1 or Figure 2 The system described for monitoring the operating state of the cooling fan of the traction motor is implemented by each of them. For example, the current detection component 14 detects (S301) the current input by the power supply 10 to the parallel fans 12 (120, 121, 122, 123), and the controller 16 compares the detected current with the preset maximum threshold and minimum threshold (step S302). Specifically, the controller 16 compares the detected current with the maximum threshold, and if the detected current is greater than the maximum threshold, a prompt signal is generated. If the detected current is less than the maximum threshold, the detected current is compared with the minimum threshold, and if the detected current is less than the minimum threshold, a prompt signal is generated. After the controller 16 generates the prompt signal according to the comparison result, the output component 18 outputs (step S302) the prompt signal. According to a further example, the current detection component 14 is connected to the line 1210 after the relay 15 starts the fan for a period of time T, so as to perform current detection (step S300).

[0037] Combination Figure 3 The described method for monitoring the operating state of a cooling fan of a traction motor may further include obtaining the temperature of the motor from a temperature sensing component of the traction motor, comparing the obtained temperature of the motor with a preset temperature threshold, and if the obtained motor temperature is greater than the temperature threshold, a prompt signal indicating that the motor temperature is high may be issued. Further, when the obtained motor temperature is greater than the temperature threshold and the detected current is less than a minimum threshold or greater than a maximum threshold, the traction motor may be controlled to stop running.

[0038] In each example described in this application, the controller can be a processor that processes data and control instructions. Furthermore, the controller is a processor configured to execute program instructions, which implements the functions of the controller 14 when executing the program instructions. These program instructions can be stored in the memory of the controller, or in the memory of the traction motor.

[0039] According to the example method for monitoring the operating status of the cooling fan of the traction motor of the present application, the program can be implemented as a program through a programming language, and then set in, for example, the memory of the traction motor, and read and executed by the controller of the traction motor, thereby realizing the monitoring of the fan status.

[0040] The present application also provides a traction motor for an elevator, the traction motor comprising any one of the above-described systems for monitoring the operating status of a cooling fan of the traction motor. In some cases, one or more cooling fans are provided on the traction motor, such as on a cooling rib of the traction motor. In this case, the cooling fan may also be used as a component of the traction iodine.

[0041] The present application also provides an application system for elevator maintenance, which is set in an electronic device. The application system is implemented as one or more programs in a programming language. When the one or more programs are executed by the electronic device: a prompt signal indicating the operating status of the cooling fan of the traction motor of the elevator is received through the communication interface of the electronic terminal; and the prompt signal is output by the output component of the electronic device. For example, the prompt signal can be a prompt signal output by any example of the system for monitoring the operating status of the cooling fan of the traction motor described above, or a prompt signal output according to the method for monitoring the operating status of the cooling fan of the traction motor described above. The prompt signal can be displayed by the display screen of the electronic device and / or can be output by the voice output component of the electronic device. As an example, the application system can be implemented as an application for installation by an applicable electronic device, so that the electronic device installed with it can be used to implement the process of monitoring the operating status of the cooling fan of the traction motor described herein.

[0042] Although specific embodiments of the present application have been shown and described in detail to illustrate the principles of the present application, it should be understood that the present application may be implemented in other ways without departing from such principles, such as new embodiments obtained by combining the features of the various embodiments described herein.

Claims

1. A method for monitoring the operating status of a cooling fan of a traction motor, wherein the cooling fan comprises one or more fans, characterized in that: The method comprises: The current detection component detects the current delivered to the fan by the power supply; When the detected current is less than a minimum threshold or greater than a maximum threshold, a prompt signal is output; The minimum threshold is set according to the open-circuit current of the fan, and the maximum threshold is set according to the short-circuit current of the fan.

2. The method according to claim 1, characterized in that In the case where the heat dissipation fan includes a plurality of fans, the plurality of fans are configured to be connected in parallel to the power supply; as well as The current detection component detects the current delivered to the fan by the power supply, including: The total current delivered by the power supply to the plurality of fans connected in parallel is detected by a current detection component.

3. The method according to claim 1, characterized in that In the case where the heat dissipation fan includes a plurality of fans, the plurality of fans are configured to be connected in parallel to the power supply; as well as The current detection component detects the current delivered by the power supply to the plurality of fans, including: The current of each of the plurality of fans is detected by a current detection member provided for each of the plurality of fans.

4. The method according to any one of claims 1 to 3, characterized in that: The current detection component detects the current delivered to the fan by the power supply, including: After the fan is started for a period of time T, the current detection component detects the current delivered to the fan by the power supply.

5. A system for monitoring the operating status of a cooling fan of a traction motor, wherein the cooling fan comprises one or more fans, characterized in that: The system comprises: a current detection component, used for detecting the current delivered to the fan by the power supply; a controller for comparing the detected current with a minimum threshold or a maximum threshold, and generating a prompt signal when the detected current is less than the minimum threshold or greater than the maximum threshold; The output component is used to output the generated prompt signal.

6. The system according to claim 5, characterized in that When the heat dissipation fan includes a plurality of fans, the plurality of fans are connected to the power supply in parallel, and the current detection component detects the total current delivered by the power supply to the plurality of fans in parallel.

7. The system according to claim 5, characterized in that When the heat dissipation fan comprises a plurality of fans, the plurality of fans are connected to the power supply in parallel, wherein the current detection component is configured to detect the current of each of the plurality of fans.

8. The system according to claim 5, characterized in that The output component includes a communication component.

9. The system according to claim 5, characterized in that The current detection component is a current sensor.

10. The system according to claim 5, characterized in that The system further comprises: The switch component is used to control the opening of the current detection component.

11. The system according to any one of claims 5 to 10, characterized in that: The traction motor is a traction motor of an elevator, and the controller is configured to obtain a temperature value from a temperature detection component of the traction motor, and to stop the traction motor when the obtained temperature value is greater than a temperature threshold and the detected current is less than a minimum threshold or greater than a maximum threshold.

12. A traction motor for an elevator, characterized in that: The traction motor include: A system for monitoring the operating status of a cooling fan of a traction motor according to any one of claims 5 to 11.

13. An application system for elevator maintenance, which is provided in an electronic device, wherein the application system is implemented as one or more programs, and when the one or more programs are executed by the electronic device: receiving, through the communication interface of the electronic terminal, a prompt signal indicating the operating state of a cooling fan of a traction motor of the elevator; Outputting the prompt signal through one or both of a display screen and a voice output of the electronic device; in, The prompt signal is a prompt signal output by a system for monitoring the operating status of a cooling fan of a traction motor according to any one of claims 5 to 11, or a prompt signal output by a method according to any one of claims 1 to 4.

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