Condensation prevention system for elevator hoist and condensation prevention method for elevator hoist

Abstract

The invention provides a condensation prevention system of a hoisting machine of an elevator and a condensation prevention method of the hoisting machine of the elevator. It is possible to accurately determine whether or not condensation prevention operation of the hoist is necessary, thereby preventing condensation from occurring in the hoist. The present invention is provided with: a dew point temperature calculation unit (20) that acquires the temperature and relative humidity of a hoistway, and calculates the dew point temperature of the hoistway on the basis of the acquired temperature and relative humidity of the hoistway; a hoist temperature acquisition unit (22) that acquires the temperature of the hoist; a determination unit (23) that determines that a condensation prevention operation for increasing the temperature of the hoist is necessary when the temperature of the hoist calculated by the hoist temperature calculation unit (22) is greater than the dew-point temperature calculated by the dew-point temperature calculation unit (20) and equal to or less than a temperature obtained by adding a predetermined threshold temperature to the dew-point temperature; and a hoist control unit (27) that performs a condensation prevention operation when the determination unit (23) determines that the condensation prevention operation is necessary.

Description

Technical Field

[0001] The present invention relates to a condensation prevention system for a traction machine of an elevator and a condensation prevention method for a traction machine of an elevator. Background Art

[0002] In a conventional elevator condensation prevention system, the temperature and relative humidity of the area where the elevator is installed are obtained from a weather information service center, and the dew point temperature is calculated using the obtained temperature and relative humidity. Then, the obtained temperature and the calculated dew point temperature are used to determine whether or not condensation prevention operation of the elevator, especially the traction machine, is required, thereby preventing condensation (for example, Patent Document 1).

[0003] Prior art literature

[0004] Patent Document 1: Japanese Patent Application Publication No. 2014-227235 Summary of the invention

[0005] In the conventional dew condensation prevention system of an elevator, there may be a case where the actual temperature and dew point temperature of the elevator differ from the temperature and dew point temperature acquired from the weather information service center.

[0006] In addition, in an elevator, sometimes the air of the landing station flows into the hoistway from the entrance and exit of the landing station, and the temperature and humidity of the hoistway change, and the dew point temperature of the hoistway rises. In this case, the traction machine installed in a place away from the entrance and exit of the landing station in the hoistway will not be directly affected by the inflow of the landing station air. Therefore, sometimes the temperature of the traction machine is lower than the dew point temperature of the hoistway after the increase, and condensation occurs on the traction machine. In the existing elevator condensation prevention system, such a situation where the environmental conditions in the elevator are not constant is not taken into account.

[0007] Therefore, when focusing on the hoisting machine, the conventional elevator condensation prevention system cannot accurately determine whether or not the condensation prevention operation of the hoisting machine is necessary, and condensation may occur.

[0008] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a condensation prevention system for an elevator hoisting machine that can accurately determine whether or not a condensation prevention operation of the hoisting machine is required, thereby preventing condensation from occurring in the hoisting machine.

[0009] The condensation prevention system of the hoisting machine of the elevator of the present invention comprises: a dew point temperature calculation unit, which obtains the temperature and relative humidity of the shaft and calculates the dew point temperature of the shaft based on the obtained shaft temperature and relative humidity; a hoisting machine temperature acquisition unit, which obtains the temperature of the hoisting machine; a determination unit, which determines that it is necessary to perform a condensation prevention operation to increase the temperature of the hoisting machine when the temperature of the hoisting machine obtained by the hoisting machine temperature acquisition unit is greater than the dew point temperature calculated by the dew point temperature calculation unit and is below the temperature obtained by adding a predetermined threshold temperature to the dew point temperature; and a hoisting machine control unit, which performs a condensation prevention operation when the determination unit determines that the condensation prevention operation is necessary.

[0010] The method for preventing condensation of the hoisting machine of an elevator of the present invention comprises the following steps: a dew point temperature calculation step, in which the dew point temperature calculation unit obtains the temperature and relative humidity of the shaft and calculates the dew point temperature of the shaft based on the obtained shaft temperature and relative humidity; a hoisting machine temperature acquisition step, in which the hoisting machine temperature acquisition unit obtains the temperature of the hoisting machine; a determination step, in which the determination unit determines that it is necessary to perform a condensation prevention operation to increase the temperature of the hoisting machine when the temperature of the hoisting machine obtained by the hoisting machine temperature acquisition unit is greater than the dew point temperature calculated by the dew point temperature calculation unit and is below the temperature obtained by adding a predetermined threshold temperature to the dew point temperature; and a hoisting machine control step, in which the hoisting machine control unit performs a condensation prevention operation when the determination unit determines that it is necessary to perform a condensation prevention operation.

[0011] Effects of the Invention

[0012] According to the present invention, it is possible to accurately determine whether or not the condensation prevention operation of the hoisting machine is necessary, thereby preventing condensation from occurring in the hoisting machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a block diagram of an elevator according to Embodiment 1.

[0014] Figure 2 This is a cross-sectional view of the hoisting machine of the elevator according to the first embodiment.

[0015] Figure 3 It is a configuration diagram of a condensation prevention system for a traction machine of an elevator according to the first embodiment.

[0016] Figure 4 This is a table stored in the storage unit of the first embodiment.

[0017] Figure 5 This is a diagram showing the hardware configuration of the elevator control panel according to the first embodiment.

[0018] Figure 6 This is a flowchart showing the operation of the condensation prevention system for the elevator hoisting machine according to the first embodiment.

[0019] Description of symbols

[0020] 1: Hoistway; 2: Floor; 3: Car; 4: Counterweight; 5: Rope; 6: Traction machine; 7: Car door; 8: Floor door; 9: Pulley; 10: Motor; 11: Shaft; 12: Bearing; 13: Control device; 14: Base member; 15: Stator; 16: Rotor; 17: Housing; 18: Thermohygrometer; 19: Elevator control panel; 20: Dew point temperature calculation unit; 21: Resistance value measurement unit; 22: Traction machine temperature acquisition unit; 23: Determination unit; 24: Required temperature rise calculation unit; 25: Storage unit; 26: Condensation prevention operation time acquisition unit; 27: Traction machine control unit; 28: Notification unit; 29: Maintenance company; 40: Bus; 41: Processor; 42: Memory; 43: Interface; 44: Auxiliary storage device. DETAILED DESCRIPTION

[0021] Implementation method 1.

[0022] The structure of the elevator according to Embodiment 1 will be described. Figure 1 This is a block diagram of an elevator according to Embodiment 1. Figure 2 2 is a cross-sectional view of the hoisting machine 6 of the elevator according to Embodiment 1. Figure 1 The elevator is a machine room-less, rope-type elevator with ropes wound in a 1:1 manner. Figure 1 The elevator car 3 shows the state where it has reached the uppermost landing 2. Figure 2 Viewed from the landing 2 side Figure 1 Figure 2. AA section of the image.

[0023] exist Figure 1 In the elevator, a shaft 1 and a landing 2 are provided. The shaft 1 includes: a car 3 that moves in a vertical direction; a counterweight 4 that moves in a vertical direction; a rope 5 that connects the car 3 and the counterweight 4; a traction machine 6 around which the rope 5 is hung; and a thermometer and hygrometer 18 that is provided on the surface of the wall that forms the entrance and exit of the landing 2 on the side of the shaft 1. The car 3 has a car door 7 at the entrance and exit. In addition, the landing 2 on each floor has a landing door 8 at the entrance and exit. When the car 3 arrives at the landing 2, the car door 7 and the landing door 8 are connected by a connecting mechanism not shown in the figure, and are opened and closed by sliding. The thermometer and hygrometer 18 measures the temperature and relative humidity of the shaft 1.

[0024] exist Figure 2 In the figure, the traction machine 6 includes: a sheave 9, which is hung with a rope 5; a motor 10, which generates a driving force for rotating the sheave 9; a shaft 11, which transmits the driving force generated by the motor 10 to the sheave 9; a pair of bearings 12, which support the shaft 11 so that it can rotate; a control device 13, which controls the rotation of the sheave 9; and a base member 14, which supports the sheave 9, the motor 10 and the bearings 12.

[0025] The motor 10 includes a stator 15, a rotor 16, and a housing 17. The housing 17 accommodates the stator 15 and the rotor 16. The stator 15 is fixed to the housing 17. In addition, the stator 15 is composed of an iron core and a winding. The rotor 16 is configured so that a gap is provided between the stator 15 and the end of the motor 10 side of the shaft 11 is pressed into and fixed to the rotor 16. When a current is passed through the winding of the stator 15 of the motor 10, the magnetic field changes, and the rotor 16 rotates by interacting with the magnetic field of the stator 15, thereby transmitting the driving force to the shaft 11. In addition, usually, the winding of the stator 15 is formed of an insulating material, and the iron core of the stator 15, the rotor 16, and the housing 17 are formed of a conductive material.

[0026] When condensation occurs in the hoisting machine 6, water droplets adhere to the equipment in the motor 10, or water accumulates at the bottom of the motor 10. Here, the winding of the stator 15 formed of an insulating material absorbs moisture, which may lead to an increase in partial discharge of the winding of the stator 15. Partial discharge indicates deterioration of the insulating material and / or poor insulation. When partial discharge occurs continuously, insulation breakdown may occur. Therefore, when the partial discharge of the winding of the stator 15 increases, insulation breakdown occurs, and eventually a short circuit occurs, causing a failure of the hoisting machine 6. The failure of the hoisting machine 6 refers to, for example, a failure of the brake of the hoisting machine 6 not shown. Since the brake of the hoisting machine 6 is operated by the back electromotive force of the stator 15, it cannot operate normally when a short circuit occurs in the winding of the stator 15, and the rotation of the hoisting machine 6 may not be stopped. Therefore, if condensation is prevented from occurring in the hoisting machine 6, the failure of the hoisting machine 6 can be avoided.

[0027] Next, the structure of the condensation prevention system for the elevator hoisting machine 6 of Embodiment 1 is described. In the condensation prevention system for the elevator hoisting machine 6 of Embodiment 1, a sign of condensation in the hoisting machine 6 is detected, and a condensation prevention operation is performed to prevent condensation in the hoisting machine 6.

[0028] The condensation prevention operation is an operation for increasing the amount of heat generated by the hoisting machine 6 in order to increase the temperature of the hoisting machine 6, especially the winding temperature of the stator 15. The condensation prevention operation is, for example, an operation in which a voltage is applied to the motor 10 while the brake of the hoisting machine 6 is applied, so that the hoisting machine 6 is stationary. When the hoisting machine 6 is driven in this way, a load is applied to the motor 10, the amount of heat generated by the hoisting machine 6 increases, and the temperature of the hoisting machine 6 rises.

[0029] Figure 31 is a block diagram of a condensation prevention system for the hoisting machine 6 of an elevator according to Embodiment 1. The condensation prevention system for the hoisting machine 6 of an elevator includes a thermohygrometer 18 installed in the hoistway 1, a stator 15 of the hoisting machine 6, a dew point temperature calculation unit 20, a resistance value measurement unit 21, a hoisting machine temperature acquisition unit 22, a determination unit 23, a required temperature rise calculation unit 24, a storage unit 25, a condensation prevention operation time acquisition unit 26, a hoisting machine control unit 27, and a notification unit 28. The dew point temperature calculation unit 20, the resistance value measurement unit 21, the hoisting machine temperature acquisition unit 22, the determination unit 23, the required temperature rise calculation unit 24, the storage unit 25, the condensation prevention operation time acquisition unit 26, the hoisting machine control unit 27, and the notification unit 28 realize their functions through an elevator control panel 19 provided in the elevator.

[0030] The dew point temperature calculation unit 20 obtains the temperature and relative humidity of the shaft 1 from the thermohygrometer 18, and uses the obtained temperature and relative humidity of the shaft 1 to calculate the dew point temperature T1, which is the temperature at which condensation occurs in the shaft 1. As a method for calculating the dew point temperature T1, for example, the dew point temperature T1 corresponding to the obtained temperature and relative humidity can be obtained by referring to a humid air line diagram.

[0031] The resistance value measuring unit 21 measures the resistance value RT2 of the winding of the stator 15. The resistance value measuring unit 21 is usually used to measure the resistance value RT2 of the winding of the stator 15 during periodic maintenance.

[0032] The hoisting machine temperature acquisition unit 22 acquires the temperature T2 of the hoisting machine 6. The hoisting machine temperature acquisition unit 22 calculates the temperature T2 of the hoisting machine 6 using, for example, the resistance value RT2 of the winding of the stator 15 measured by the resistance value measuring unit 21, thereby acquiring the temperature T2 of the hoisting machine 6. Here, the resistance value RT2 is expressed as in Formula 1 using the temperature T2 of the hoisting machine 6, an arbitrary temperature t, the resistance value Rt at the temperature t, and the resistance temperature coefficient αt at the temperature t. By modifying Formula 1, the temperature T2 of the hoisting machine 6 is expressed as in Formula 2. Therefore, the hoisting machine temperature acquisition unit 22 calculates the temperature T2 of the hoisting machine 6 according to Formula 2 using the temperature t, the resistance value Rt, and the resistance temperature coefficient αt measured or calculated in advance, and the resistance value RT2 of the winding of the stator 15 measured by the resistance value measuring unit 21.

[0033] [Formula 1]

[0034] Rr2=Rt+αtR,(T2-t)

[0035] [Formula 2]

[0036]

[0037] The determination unit 23 determines whether or not condensation prevention operation is required using the dew point temperature T1 calculated by the dew point temperature calculation unit 20, the temperature T2 of the hoisting machine 6 acquired by the hoisting machine temperature acquisition unit 22, and the preset threshold temperature T3. Specifically, the determination unit 23 determines whether or not the temperature T2 of the hoisting machine 6 is greater than the dew point temperature T1. When the temperature T2 of the hoisting machine 6 is greater than the dew point temperature T1, the determination unit 23 determines whether or not the temperature T2 of the hoisting machine 6 is less than or equal to the temperature obtained by adding the threshold temperature T3 to the dew point temperature T1. When the temperature T2 of the hoisting machine 6 is less than or equal to the dew point temperature T1, the determination unit 23 determines that condensation has occurred in the hoisting machine 6.

[0038] Furthermore, when the temperature T2 of the hoisting machine 6 is lower than the temperature obtained by adding the threshold temperature T3 to the dew point temperature T1, the determination unit 23 detects a sign of condensation in the hoisting machine 6 and determines that it is necessary to perform a condensation prevention operation for preventing condensation in the hoisting machine 6. Furthermore, when the temperature T2 of the hoisting machine 6 is higher than the temperature obtained by adding the threshold temperature T3 to the dew point temperature T1, the determination unit 23 determines that it is not necessary to perform a condensation prevention operation.

[0039] The threshold temperature T3 is set such that the temperature obtained by adding the threshold temperature T3 to the dew point temperature T1 is slightly higher than the dew point temperature T1. By setting the threshold temperature T3 in this way, the determination unit 23 can determine that the temperature T2 of the hoisting machine 6 is close to the dew point temperature T1 and that condensation is about to occur in the hoisting machine 6. The threshold temperature T3 is set to 3°C, for example.

[0040] The required temperature rise calculation unit 24 uses the dew point temperature T1, the temperature T2 of the hoisting machine 6, and the threshold temperature T3 to calculate the required temperature rise T4, which is the required temperature rise T4 required to make the temperature T2 of the hoisting machine 6 higher than the temperature obtained by adding the threshold temperature T3 to the dew point temperature T1. For example, when the dew point temperature T1 is 10°C, the temperature T2 of the hoisting machine 6 is 12.5°C, and the threshold temperature T3 is 3°C, the temperature obtained by adding the threshold temperature T3 to the dew point temperature T1 is calculated to be 13°C, and the required temperature rise T4, which is the difference from the temperature T2 of the hoisting machine 6, is 0.5°C. The required temperature rise calculation unit 24 may also obtain the dew point temperature T1, the temperature T2 of the hoisting machine 6, and the threshold temperature T3 from the determination unit 23.

[0041] Figure 4 This is a table stored in the storage unit 25 of the first embodiment. Figure 4 The table corresponding to the case where the temperature of the shaft 1 is 15° C. is shown. The storage unit 25 stores a table that associates the condensation prevention operation time indicating the time for performing the condensation prevention operation with the temperature rise of the hoisting machine 6 caused by performing the condensation prevention operation during the condensation prevention operation time. Figure 4As shown, when the condensation prevention operation is performed for 20 seconds when the temperature of the shaft 1 is 15°C, the temperature of the traction machine 6 rises by 0.5°C. In addition, the relationship between the condensation prevention operation time and the rising temperature varies depending on the temperature of the shaft 1. Thus, the storage unit 25 stores the relationship between the condensation prevention operation time and the rising temperature corresponding to the temperature of the shaft 1 in the table. For example, the storage unit 25 may also store the temperature of the shaft 1 in the table at intervals of 0.5°C.

[0042] When the determination unit 23 determines that the condensation prevention operation is required, the condensation prevention operation time acquisition unit 26 acquires the condensation prevention operation time corresponding to the rising temperature equivalent to the required rising temperature T4 calculated by the required rising temperature calculation unit 24 from the table stored in the storage unit 25. Here, the temperature of the shaft 1 measured by the thermohygrometer 18 is acquired, and the table corresponding to the acquired temperature of the shaft 1 is referenced. For example, the table corresponding to the case where the temperature of the shaft 1 is 15°C is referenced. Figure 4 When the required temperature rise T4 is 0.5°C, the temperature rise corresponding to the required temperature rise T4 is 0.5°C, and the time required to obtain the condensation prevention operation time is 20 seconds.

[0043] The hoisting machine control unit 27 switches between the normal operation and the condensation prevention operation of the hoisting machine 6, and controls the operation of the hoisting machine 6. When the determination unit 23 determines that the condensation prevention operation is necessary, the condensation prevention operation is performed. In addition, when the condensation prevention operation time acquired by the condensation prevention operation time acquisition unit 26 is received, the operation of the hoisting machine 6 is controlled in such a manner that the condensation prevention operation is performed during the condensation prevention operation time acquired by the condensation prevention operation time acquisition unit 26. In addition, the hoisting machine control unit 27 immediately starts the condensation prevention operation when the elevator is in the standby state, and starts the condensation prevention operation after the elevator enters the standby state when the elevator is not in the standby state. In addition, the hoisting machine control unit 27 restarts the normal operation of the hoisting machine 6 after the condensation prevention operation ends. In addition, when a landing call is registered during the condensation prevention operation, the condensation prevention operation is continued, and the landing call is responded to after the condensation prevention operation ends.

[0044] When the determination unit 23 determines that condensation has occurred in the hoisting machine 6 , the notification unit 28 notifies an external maintenance company 29 that condensation has occurred in the hoisting machine 6 .

[0045] Here, the hardware configuration of the elevator control panel 19 according to the first embodiment will be described. Figure 5 This is a diagram showing the hardware configuration of the elevator control panel 19 according to Embodiment 1. The elevator control panel 19 is implemented by a computer such as a personal computer or a microcontroller.

[0046] The elevator control panel 19 includes a processor 41 , a memory 42 , an interface 43 , and an auxiliary storage device 44 , which are connected to each other via a bus 40 .

[0047] The processor 41 is, for example, a CPU (Central Processing Unit) and realizes each function of the elevator control panel 19 by reading an operating program stored in an auxiliary storage device 44 into a memory 42 and executing the program.

[0048] The memory 42 is a main storage device composed of, for example, a RAM (Random Access Memory). The memory 42 stores a program read by the processor 41 from the auxiliary storage device 44. The memory 42 also functions as a working memory when the processor 41 executes the program.

[0049] The interface 43 is an I / O (Input / Output) interface such as a serial port, a USB (Universal Serial Bus) port, a network interface, etc. The interface 43 is used to perform input from the thermo-hygrometer 18 and input and output from the hoisting machine 6 .

[0050] The auxiliary storage device 44 is, for example, a flash memory, a HDD (Hard Disk Drive), or an SSD (Solid State Drive) and stores various information necessary for the operation of the object detection system at the elevator entrance and a program executed by the processor 41 .

[0051] Next, the operation of the condensation prevention system of the hoisting machine 6 of the elevator according to the first embodiment will be described. Figure 6 This is a flowchart showing the operation of the condensation prevention system of the hoisting machine 6 of the elevator according to the first embodiment.

[0052] First, the dew point temperature calculation unit 20 obtains the temperature and relative humidity of the shaft 1 from the thermohygrometer 18, and uses the obtained temperature and relative humidity of the shaft 1 to calculate the dew point temperature T1 of the shaft 1. In addition, the traction machine temperature acquisition unit 22 calculates the temperature T2 of the traction machine 6 using the resistance value RT2 of the winding of the stator 15 detected by the resistance value measurement unit 21, thereby obtaining the temperature T2 of the traction machine 6. The calculation of the dew point temperature T1 and the calculation of the temperature T2 of the traction machine 6 are performed periodically, for example, once per minute (S1).

[0053] Next, the determination unit 23 determines whether or not the condensation prevention operation is necessary using the dew point temperature T1 calculated by the dew point temperature calculation unit 20, the temperature T2 of the hoisting machine 6 detected by the resistance value measurement unit 21, and the preset threshold temperature T3. Specifically, the determination unit 23 determines whether or not the temperature T2 of the hoisting machine 6 is greater than the dew point temperature T1 (S2). When the temperature T2 of the hoisting machine 6 is greater than the dew point temperature T1, the determination unit 23 compares whether or not the temperature T2 of the hoisting machine 6 is less than or equal to the temperature obtained by adding the threshold temperature T3 to the dew point temperature T1, thereby determining whether or not the condensation prevention operation is necessary (S3).

[0054] When the temperature T2 of the hoisting machine 6 is greater than the dew point temperature T1 ("Yes" in S2) and is less than the temperature obtained by adding the threshold temperature T3 to the dew point temperature T1, it is determined that the condensation prevention operation is required ("Yes" in S3). In addition, the condensation prevention operation time acquisition unit 26 acquires the condensation prevention operation time corresponding to the rising temperature equivalent to the required rising temperature T4 calculated by the required rising temperature calculation unit 24 from the table of the storage unit 25. Here, the condensation prevention operation time acquisition unit 26 acquires the temperature of the shaft 1 measured by the thermohygrometer 18, and refers to the table showing the relationship between the condensation prevention operation time corresponding to the acquired temperature of the shaft 1 and the rising temperature (S4).

[0055] When receiving the condensation prevention operation time from the condensation prevention operation time acquisition unit 26, the hoisting machine control unit 27 performs the condensation prevention operation during the condensation prevention operation time calculated by the condensation prevention operation time acquisition unit 26. As the condensation prevention operation, the traction machine control unit 27 performs, for example, the following operation: a voltage is applied to the motor 10 in a state where the brake of the traction machine 6 is braked, so that the traction machine 6 is stationary. In addition, the traction machine control unit 27 immediately starts the condensation prevention operation when the elevator is in the standby state, and starts the condensation prevention operation after the elevator enters the standby state when the elevator is not in the standby state. In addition, the traction machine control unit 27 resumes the normal operation of the traction machine 6 after the condensation prevention operation ends. In addition, when a landing call is registered during the condensation prevention operation, the condensation prevention operation is continued, and the landing call is responded to after the condensation prevention operation ends (S5).

[0056] When the hoisting machine 6 performs the condensation prevention operation during the condensation prevention operation time, the dew point temperature calculation unit 20 calculates the dew point temperature T1 again, and the hoisting machine temperature acquisition unit 22 acquires the temperature T2 of the hoisting machine 6 again (S1). Then, the condensation prevention operation is performed until the temperature T2 of the hoisting machine 6 becomes higher than the temperature obtained by adding the threshold temperature T3 to the dew point temperature T1 (No in S3).

[0057] When the temperature T2 of the hoisting machine 6 is higher than the dew point temperature T1 (YES in S2) and higher than the temperature obtained by adding the threshold temperature T3 to the dew point temperature T1, it is determined that the condensation prevention operation is not necessary (NO in S3), and the routine ends.

[0058] When the temperature T2 of the hoisting machine 6 is lower than the dew point temperature T1, it is determined that condensation has occurred in the hoisting machine 6 (No in S2), and the notification unit 28 notifies the external maintenance company 29 that condensation has occurred in the hoisting machine 6 (S6).

[0059] As described above, the condensation prevention system for the hoisting machine 6 of the elevator of embodiment 1 includes: a dew point temperature calculation unit 20, which obtains the temperature and relative humidity of the shaft 1 and calculates the dew point temperature T1 of the shaft 1 based on the obtained temperature and relative humidity of the shaft 1; a hoisting machine temperature acquisition unit 22, which obtains the temperature T2 of the hoisting machine 6; a determination unit 23, which determines that it is necessary to perform a condensation prevention operation to increase the temperature T2 of the hoisting machine 6 when the temperature T2 of the hoisting machine 6 obtained by the hoisting machine temperature acquisition unit 22 is greater than the dew point temperature T1 calculated by the dew point temperature calculation unit 20 and is less than the temperature obtained by adding a predetermined threshold temperature T3 to the dew point temperature T1; and a hoisting machine control unit 27, which performs a condensation prevention operation when the determination unit 23 determines that the condensation prevention operation is necessary. As a result, the condensation prevention system for the hoisting machine 6 of the elevator of embodiment 1 can accurately determine whether the condensation prevention operation of the hoisting machine 6 is necessary, thereby preventing condensation from occurring in the hoisting machine 6.

[0060] In addition, the dew point temperature calculation unit 20 can obtain the temperature and relative humidity of the shaft 1, and the acquisition means are not limited. In addition, the dew point temperature calculation unit 20 calculates the dew point temperature T1 by means of any means. In addition, the traction machine temperature acquisition unit 22 acquires the temperature T2 of the traction machine 6 by means of any means. For example, the temperature T2 of the traction machine 6 may be acquired by a temperature sensor.

[0061] Furthermore, the condensation prevention system for the hoisting machine of the elevator comprises: a required temperature rise calculation unit 24 for calculating a required temperature rise T4 which is a required temperature rise T4 required for making the temperature T2 of the hoisting machine 6 acquired by the hoisting machine temperature acquisition unit 22 higher than a temperature obtained by adding a threshold temperature T3 to the dew point temperature T1 calculated by the dew point temperature calculation unit 20; a storage unit 25 for storing a table in which the condensation prevention operation time indicating the time for performing the condensation prevention operation and the temperature rise of the hoisting machine 6 caused by performing the condensation prevention operation during the condensation prevention operation time are associated with each other; and a condensation prevention operation unit 25 for storing a table in which the condensation prevention operation time indicating the time for performing the condensation prevention operation and the temperature rise of the hoisting machine 6 caused by performing the condensation prevention operation during the condensation prevention operation time are associated with each other; and The dew prevention operation time acquisition unit 26 obtains the dew prevention operation time corresponding to the rising temperature equivalent to the required rising temperature T4 calculated by the required rising temperature calculation unit 24 from the table of the storage unit 25 when the determination unit 23 determines that the dew prevention operation is required. The hoisting machine control unit 27 performs the dew prevention operation during the dew prevention operation time obtained from the dew prevention operation time acquisition unit 26, thereby performing the dew prevention operation for the amount of time required to raise the traction machine 6 to the required rising temperature T4, thereby effectively preventing condensation from occurring on the traction machine 6.

[0062] In addition, although it is preferable that the condensation prevention operation time acquisition unit 26 calculates the condensation prevention operation time, the hoisting machine control unit 27 may perform the condensation prevention operation during a predetermined operation time.

[0063] The required temperature rise calculation unit 24 acquires the dew point temperature T1, the temperature T2 of the hoisting machine 6, and the threshold temperature T3 by any means. The dew point temperature T1 may be acquired from the determination unit 23, or the dew point temperature calculation unit 20, the temperature T2 of the hoisting machine 6 may be acquired from the hoisting machine temperature acquisition unit 22, and the threshold temperature T3 may be stored in advance.

[0064] In addition, the storage unit 25 stores the relationship between the condensation prevention operation time corresponding to the temperature of the shaft 1 and the rising temperature in a table. The condensation prevention operation time acquisition unit 26 acquires the temperature of the shaft 1, and acquires the condensation prevention operation time corresponding to the rising temperature equivalent to the required rising temperature T4 calculated by the required rising temperature calculation unit 24 from the table corresponding to the temperature of the shaft 1, thereby being able to accurately grasp the time required for the traction machine 6 to rise to the required rising temperature T4.

[0065] In addition, the means by which the condensation prevention operation time acquisition unit 26 acquires the temperature of the hoistway 1 is not limited.

[0066] Furthermore, when the elevator is not in the standby state, the hoisting machine control unit 27 starts the condensation prevention operation after the elevator enters the standby state. Furthermore, the hoisting machine control unit 27 restarts the normal operation of the hoisting machine 6 after the condensation prevention operation is completed. Furthermore, when a landing call is registered during the condensation prevention operation, the hoisting machine control unit 27 continues the condensation prevention operation and responds to the landing call after the condensation prevention operation is completed. By operating the hoisting machine 6 in this way, the hoisting machine control unit 27 can give priority to the condensation prevention operation while ensuring the smooth operation of the elevator, thereby preventing condensation from occurring in the hoisting machine 6.

[0067] In addition, the dew point temperature calculation unit 20 obtains the temperature and relative humidity of the shaft 1 from the thermometer and hygrometer 18 provided on the surface of the shaft 1 side of the wall forming the entrance and exit of the floor station 2, thereby being able to accurately obtain the dew point temperature of the shaft 1 which changes due to the air flowing into the shaft 1 from the entrance and exit of the floor station 2.

[0068] The thermometer and hygrometer 18 is preferably installed on a surface of a wall forming the entrance and exit of the landing 2 on the hoistway 1 side, but the installation location is not limited as long as it is the hoistway 1.

[0069] Furthermore, the hoisting machine temperature acquisition unit 22 acquires the temperature T2 of the hoisting machine 6 by calculating the winding temperature of the stator 15 of the hoisting machine 6, thereby preventing condensation from being generated on the stator 15 of the hoisting machine 6. Furthermore, the hoisting machine temperature acquisition unit 22 acquires the measurement result of the resistance value RT2 of the winding of the stator 15 of the hoisting machine 6, and calculates the winding temperature of the stator 15 of the hoisting machine 6 using the resistance value RT2, thereby, even without using a component for acquiring the winding temperature of the stator 15 of the hoisting machine 6, the winding temperature of the stator 15 of the hoisting machine 6 can be calculated and acquired.

[0070] In addition, there is no limitation on whether the elevator has a machine room or a rope winding method. When the hoisting machine 6 is located in the machine room, the machine room is closer to the hoisting machine 6 than the hoistway 1, so the thermohygrometer 18 can also be installed in the machine room.

[0071] In addition, the condensation prevention operation is not limited as long as it is an operation that increases the heat generation of the traction machine 6 and raises the temperature of the traction machine 6. For example, it is also possible to drive the traction machine 6 at a lower speed than usual while the brake of the traction machine 6 is braked. For example, it is also possible to operate the traction machine 6 in a manner that repeatedly moves the car 3 up and down in the hoistway 1.

[0072] In addition, the dew point temperature calculation unit 20, the resistance value measurement unit 21, the traction machine temperature acquisition unit 22, the determination unit 23, the storage unit 25, the condensation prevention operation time acquisition unit 26, the traction machine control unit 27, and the notification unit 28 realize their functions by the elevator control panel 19 provided in the elevator, but are not limited thereto. For example, a part or all of the functions may be realized by a computer or an elevator control server different from the elevator control panel 19.

[0073] In addition, air flows in from the entrance and exit of the floor station 2, and the dew point temperature of the shaft 1 sometimes rises sharply. In this case, the dew point temperature of the shaft 1 sometimes becomes higher than the temperature of the traction machine 6 before it is determined whether condensation prevention operation is required, and condensation occurs on the traction machine 6. In preparation for this situation, a condensation detection sensor may also be provided on the traction machine 6. The condensation detection sensor refers to a sensor that calculates the dew point temperature around the condensation detection sensor and compares the calculated dew point temperature with the surface temperature of the condensation detection sensor. In addition, when the condensation detection sensor detects condensation, the notification unit 28 may also notify the external maintenance company 29 that condensation has occurred on the traction machine 6.

[0074] Furthermore, when the condensation detection sensor detects condensation, a pulse test may be performed to confirm the insulation performance of the stator 15. In the pulse test, a pulse voltage is applied to the stator 15. Here, when partial discharge is detected from the signal that responded by the pulse test, deterioration of the insulating material and / or poor insulation can be detected, so that it can be known that an abnormality has occurred in the stator 15. Furthermore, when partial discharge is detected from the signal that responded by the pulse test, the abnormality of the stator 15 may be notified to an external maintenance company.

[0075] In addition, a water submersion detection sensor may be provided at the lower part of the hoisting machine 6 to confirm whether the hoisting machine 6 is submerged in water. The water submersion detection sensor is a sensor that detects a change in the conductivity of the surface of the water submersion detection sensor by, for example, forming water droplets on the surface of the water submersion detection sensor. In addition, when the water submersion detection sensor detects that the hoisting machine 6 is submerged in water, a ground fault may occur, so the power supply to the stator 15 may be stopped, and the notification unit 28 may notify the external maintenance company 29 of the abnormality of the hoisting machine 6.

[0076] In addition, the structure shown in the above embodiment is an example of the content of the present invention, and it can also be combined with other well-known technologies. In addition, part of the structure can also be omitted or changed within the scope of not departing from the gist of the present invention.

[0077] Hereinafter, various aspects of the present invention will be described in general as supplementary notes.

[0078] (Note 1)

[0079] A condensation prevention system for a traction machine of an elevator, wherein the condensation prevention system for the traction machine of an elevator comprises:

[0080] a dew point temperature calculation unit, which obtains the temperature and relative humidity of the shaft and calculates the dew point temperature of the shaft according to the obtained temperature and relative humidity of the shaft;

[0081] a traction machine temperature acquisition unit that acquires the temperature of the traction machine;

[0082] a determination unit that determines that a condensation prevention operation for raising the temperature of the hoisting machine is necessary when the temperature of the hoisting machine acquired by the hoisting machine temperature acquisition unit is greater than the dew point temperature calculated by the dew point temperature calculation unit and is equal to or less than a temperature obtained by adding a predetermined threshold temperature to the dew point temperature; and

[0083] The hoisting machine control unit performs the condensation prevention operation when the determination unit determines that the condensation prevention operation is necessary.

[0084] (Note 2)

[0085] The condensation prevention system for the hoisting machine of an elevator according to Supplementary Note 1, wherein the condensation prevention system for the hoisting machine of an elevator comprises:

[0086] a required temperature rise calculation unit that calculates a required temperature rise required to make the temperature of the hoisting machine acquired by the hoisting machine temperature acquisition unit higher than a temperature obtained by adding the threshold temperature to the dew point temperature calculated by the dew point temperature calculation unit;

[0087] a storage unit storing a table in which a condensation prevention operation time indicating a time for performing the condensation prevention operation is associated with a temperature rise of the hoisting machine caused by performing the condensation prevention operation during the condensation prevention operation time; and

[0088] a condensation prevention operation time acquisition unit, which, when the determination unit determines that the condensation prevention operation is required, acquires the condensation prevention operation time corresponding to the rising temperature equivalent to the required rising temperature calculated by the required rising temperature calculation unit from the table in the storage unit,

[0089] The hoisting machine control unit performs the condensation prevention operation during the condensation prevention operation time acquired from the condensation prevention operation time acquisition unit.

[0090] (Note 3)

[0091] The condensation prevention system for the hoisting machine of an elevator according to Supplementary Note 2, wherein:

[0092] The storage unit stores the relationship between the condensation prevention operation time and the rising temperature corresponding to the temperature of the shaft in the table.

[0093] The condensation prevention operation time acquisition unit acquires the temperature of the shaft, and acquires the condensation prevention operation time corresponding to the increased temperature equivalent to the required increased temperature calculated by the required increased temperature calculation unit from the table corresponding to the shaft temperature.

[0094] (Note 4)

[0095] The condensation prevention system for the hoisting machine of an elevator according to any one of Supplementary Notes 1 to 3, wherein:

[0096] When the elevator is not in the standby state, the hoisting machine control unit starts the condensation prevention operation after the elevator enters the standby state.

[0097] (Note 5)

[0098] The condensation prevention system for the hoisting machine of an elevator according to any one of Supplementary Notes 1 to 4, wherein:

[0099] The hoisting machine control unit resumes the normal operation of the hoisting machine after the condensation prevention operation is completed.

[0100] (Note 6)

[0101] The condensation prevention system for the hoisting machine of an elevator according to Supplementary Note 5, wherein:

[0102] When a landing call is registered during the condensation prevention operation, the hoisting machine control unit continues the condensation prevention operation and responds to the landing call after the condensation prevention operation is completed.

[0103] (Note 7)

[0104] The condensation prevention system for the hoisting machine of an elevator according to any one of Supplementary Notes 1 to 6, wherein:

[0105] The dew point temperature calculation unit acquires the temperature and relative humidity of the shaft from a thermohygrometer provided on a surface of a wall forming a landing entrance or exit on the shaft side.

[0106] (Note 8)

[0107] The condensation prevention system for the hoisting machine of an elevator according to any one of Supplementary Notes 1 to 7, wherein:

[0108] The hoisting machine temperature acquisition unit acquires the temperature of the hoisting machine by calculating the temperature of a stator winding of the hoisting machine.

[0109] (Note 9)

[0110] The condensation prevention system for the hoisting machine of an elevator according to Supplementary Note 8, wherein:

[0111] The hoisting machine temperature acquisition unit acquires a measurement result of a resistance value of a stator winding of the hoisting machine, and calculates a temperature of the stator winding of the hoisting machine using the resistance value.

[0112] (Note 10)

[0113] A method for preventing condensation of a traction machine of an elevator, wherein the method for preventing condensation of a traction machine of an elevator comprises the following steps:

[0114] a dew point temperature calculation step, wherein a dew point temperature calculation unit obtains the temperature and relative humidity of the shaft, and calculates the dew point temperature of the shaft according to the obtained temperature and relative humidity of the shaft;

[0115] a traction machine temperature obtaining step, in which a traction machine temperature obtaining unit obtains the temperature of the traction machine;

[0116] a determination step, wherein the determination unit determines that a condensation prevention operation for raising the temperature of the hoisting machine is required when the temperature of the hoisting machine acquired by the hoisting machine temperature acquisition unit is greater than the dew point temperature calculated by the dew point temperature calculation unit and is equal to or less than a temperature obtained by adding a predetermined threshold temperature to the dew point temperature; and

[0117] In the hoisting machine control step, the hoisting machine control unit performs the condensation prevention operation when the determination unit determines that the condensation prevention operation is necessary.

Claims

1. A condensation prevention system for a traction machine of an elevator, wherein: The condensation prevention system of the elevator traction machine comprises: a dew point temperature calculation unit, which obtains the temperature and relative humidity of the shaft and calculates the dew point temperature of the shaft according to the obtained temperature and relative humidity of the shaft; a traction machine temperature acquisition unit that acquires the temperature of the traction machine; a determination unit that determines that a condensation prevention operation for raising the temperature of the hoisting machine is required when the temperature of the hoisting machine acquired by the hoisting machine temperature acquisition unit is greater than the dew point temperature calculated by the dew point temperature calculation unit and is equal to or less than a temperature obtained by adding a predetermined threshold temperature to the dew point temperature; as well as The hoisting machine control unit performs the condensation prevention operation when the determination unit determines that the condensation prevention operation is necessary.

2. The condensation prevention system for the elevator traction machine according to claim 1, wherein: The condensation prevention system of the elevator traction machine comprises: a required temperature rise calculation unit that calculates a required temperature rise required to make the temperature of the hoisting machine acquired by the hoisting machine temperature acquisition unit higher than a temperature obtained by adding the threshold temperature to the dew point temperature calculated by the dew point temperature calculation unit; a storage unit storing a table that associates a condensation prevention operation time indicating a time for performing the condensation prevention operation with a temperature rise of the hoisting machine caused by performing the condensation prevention operation during the condensation prevention operation time; as well as a condensation prevention operation time acquisition unit, which, when the determination unit determines that the condensation prevention operation is required, acquires the condensation prevention operation time corresponding to the rising temperature equivalent to the required rising temperature calculated by the required rising temperature calculation unit from the table in the storage unit, The hoisting machine control unit performs the condensation prevention operation during the condensation prevention operation time acquired from the condensation prevention operation time acquisition unit.

3. The condensation prevention system for the elevator traction machine according to claim 2, wherein: The storage unit stores the relationship between the condensation prevention operation time and the rising temperature corresponding to the temperature of the shaft in the table. The condensation prevention operation time acquisition unit acquires the temperature of the shaft, and acquires the condensation prevention operation time corresponding to the increased temperature equivalent to the required increased temperature calculated by the required increased temperature calculation unit from the table corresponding to the shaft temperature.

4. The condensation prevention system for the elevator traction machine according to any one of claims 1 to 3, wherein: When the elevator is not in the standby state, the hoisting machine control unit starts the condensation prevention operation after the elevator enters the standby state.

5. The condensation prevention system for the elevator traction machine according to any one of claims 1 to 4, wherein: The hoisting machine control unit resumes the normal operation of the hoisting machine after the condensation prevention operation is completed.

6. The condensation prevention system for the elevator traction machine according to claim 5, wherein: When a landing call is registered during the condensation prevention operation, the hoisting machine control unit continues the condensation prevention operation and responds to the landing call after the condensation prevention operation is completed.

7. The condensation prevention system for the elevator traction machine according to any one of claims 1 to 6, wherein: The dew point temperature calculation unit acquires the temperature and relative humidity of the shaft from a thermohygrometer provided on a surface of a wall forming a landing entrance or exit on the shaft side.

8. The condensation prevention system for the elevator traction machine according to any one of claims 1 to 7, wherein: The hoisting machine temperature acquisition unit acquires the temperature of the hoisting machine by calculating the temperature of a stator winding of the hoisting machine.

9. The condensation prevention system for the elevator traction machine according to claim 8, wherein: The hoisting machine temperature acquisition unit acquires a measurement result of a resistance value of a stator winding of the hoisting machine, and calculates a temperature of the stator winding of the hoisting machine using the resistance value.

10. A method for preventing condensation in a traction machine of an elevator, wherein: The method for preventing condensation of the traction machine of the elevator comprises the following steps: a dew point temperature calculation step, wherein a dew point temperature calculation unit obtains the temperature and relative humidity of the shaft, and calculates the dew point temperature of the shaft according to the obtained temperature and relative humidity of the shaft; a traction machine temperature obtaining step, in which a traction machine temperature obtaining unit obtains the temperature of the traction machine; a determination step in which the determination unit determines that it is necessary to perform a condensation prevention operation for raising the temperature of the hoisting machine when the temperature of the hoisting machine acquired by the hoisting machine temperature acquisition unit is greater than the dew point temperature calculated by the dew point temperature calculation unit and is equal to or less than a temperature obtained by adding a predetermined threshold temperature to the dew point temperature; as well as In the hoisting machine control step, the hoisting machine control unit performs the condensation prevention operation when the determination unit determines that the condensation prevention operation is necessary.

Images