KR102634210B1 - Elevator system including heater in lift machine - Google Patents

Abstract

The present invention relates to an elevator system including a heater for an actuator, and includes an actuator, a heater for increasing the temperature of the actuator, and a main control panel for controlling the operation of the heater based on ambient temperature. Therefore, the present invention can forcibly increase the temperature of the internal permanent magnet of the driver in response to low temperature by heating the driver by placing a heater inside or outside the driver, and the driver due to an unexpected increase in the permanent magnetic properties of the magnet at low temperature. By preventing abnormal operation, the elevator car can be operated normally.

Description

Elevator system including heater for actuator {ELEVATOR SYSTEM INCLUDING HEATER IN LIFT MACHINE}

The present invention relates to elevator system technology, and more specifically, to an elevator system including a heater for a driver that forcibly increases the temperature of the driver in a low-temperature environment to enable normal operation of the elevator car.

An elevator is a device that lifts passengers or cargo along a hoistway formed along the vertical direction of a building. A typical elevator is an elevator car arranged to be able to go up and down in a hoistway, and a counterweight connected to the elevator car by a wire rope. ), so-called electric elevators equipped with a traction machine that drives the elevator car and counterweight up and down by rotating forward and backward in frictional contact with the wire rope on the upper side of the hoistway are widely used.

Generally, electric elevators have a separate dedicated machine room space where a lift machine including an electric motor that drives and stops the elevator and lift machine-related devices are located. The ambient temperature of the machine room should be maintained appropriately, generally in the temperature range of 5℃ to 40℃. If the temperature is not properly maintained, the elevator may automatically stop operating until the temperature returns to normal. Therefore, ventilation devices, heating and cooling devices, etc. are used to provide an appropriate working environment for the equipment installed in the machine room. However, due to the influence of weather, technical problems in the building, failure of ventilation devices, etc., and neglect of use and maintenance around the machine room, the surrounding temperature of the machine room cannot be properly maintained, and the actuator may be exposed to low temperatures.

The actuator of most electric elevators is a synchronous motor using permanent magnets. A synchronous motor arranges three-phase windings on a stator and arranges permanent magnets on the corresponding mover, so that when three-phase AC power flows through the three-phase windings of the stator, the mover rotates. When AC power is applied to the stator, a clockwise rotating magnetic field is generated, and when this rotating magnetic field reaches synchronous speed, a clockwise rotating starting torque is applied to the mover, and the mover operates at synchronous speed.

When the temperature of neodymium (NdFeB) permanent magnets in elevator drivers decreases, their magnetic properties increase up to a certain temperature. The permanent magnetic properties of neodymium magnets are affected by different external conditions such as ambient temperature, mechanical shock and irradiation. Among all these factors, the effects of ambient temperature changes are particularly common and severe. Accordingly, neodymium permanent magnets are designed into various grades depending on not only magnetic performance but also operating temperature.

However, there is concern that an unexpected increase in the magnetic properties of the magnet due to low temperatures outside of the design may cause abnormal operation of the actuator, adversely affecting elevator operation.

Korean Patent No. 10-1928411 (2018.12.06)

One embodiment of the present invention seeks to provide an elevator system including a heater for a driver that forcibly increases the temperature of the driver in a low-temperature environment to enable normal operation of the elevator car.

One embodiment of the present invention provides an elevator system including a heater for an actuator that prevents abnormal operation of the actuator at low temperatures by placing the heater outside or inside the elevator actuator and operating the heater based on the environmental context. We would like to provide

One embodiment of the present invention seeks to provide an elevator system including a heater for an actuator that is connected to a remote management system and a network to remotely control the operation of the heater for the actuator.

Among embodiments, an elevator system including a heater for an actuator includes an actuator, a heater for increasing the temperature of the actuator, and a main control panel that controls the operation of the heater based on ambient temperature.

The heater may be configured as an electric heater that is disposed inside or outside the driver and receives power under the control of the main control panel to generate heat to heat the driver.

The heater may be composed of a winding for high-frequency induction heating of the internal permanent magnet of the driver by applying a high-frequency voltage or current under the control of the main control panel.

The main control panel can operate the heater so that the driver does not fall below a preset minimum temperature.

The main control panel may operate the heater before the elevator usage increases based on the elevator usage.

Based on the elevator usage, the main control panel can save energy by stopping the operation of the heater when the elevator usage is less than a preset minimum usage or during times when there is no usage.

The main control panel can control the heater according to preset conditions by combining elevator usage and room temperature information of the machine room where the driver is installed.

Among embodiments, an elevator system including a heater for an actuator further includes a terminal connected to a network with a remote management system and remotely operating the heater through the remote management system, wherein the remote management system determines the installation location of the elevator. As a standard, environmental context including at least one of time, season, temperature, weather, and usage can be collected, and based on the collected environmental context, if the temperature of the driver is below a preset temperature, a heater control signal can be provided to the terminal. there is.

When a heater control signal is received from the remote management system, the terminal can provide a control signal and a heater operation signal to increase the temperature of the driver to the main control panel or the heater.

The driver is a power generating device that includes an electric motor, a brake, and a pulley. The electric motor consists of a permanent magnet, a winding, and an iron core, and the main control panel applies high-frequency voltage or current to the winding to heat the permanent magnet at high frequency. Alternatively, Joule heat can be generated by applying current to the winding.

The disclosed technology can have the following effects. However, since it does not mean that a specific embodiment must include all of the following effects or only the following effects, the scope of rights of the disclosed technology should not be understood as being limited thereby.

An elevator system including a heater for an actuator according to an embodiment of the present invention forcibly increases the temperature of the actuator in a low-temperature environment to enable normal operation of the elevator car.

An elevator system including a heater for an actuator according to an embodiment of the present invention arranges the heater outside or inside the elevator actuator and operates the heater based on the environmental context to prevent abnormal operation of the actuator at low temperatures. do.

An elevator system including a heater for an actuator according to an embodiment of the present invention can be connected to a remote management system through a network to remotely control the operation of the heater for an actuator.

1 is a diagram showing the schematic configuration of an elevator system including a heater for an actuator according to the present invention.
FIG. 2 is a diagram showing the detailed configuration of the elevator system in FIG. 1.
Figure 3 is an example diagram showing the number of elevator operations by time slot.
Figure 4 is a flowchart for explaining an operation method of an elevator system including a heater for an actuator according to an embodiment.

Since the description of the present invention is only an example for structural or functional explanation, the scope of the present invention should not be construed as limited by the examples described in the text. In other words, since the embodiments can be modified in various ways and can have various forms, the scope of rights of the present invention should be understood to include equivalents that can realize the technical idea. In addition, the purpose or effect presented in the present invention does not mean that a specific embodiment must include all or only such effects, so the scope of the present invention should not be understood as limited thereby.

Meanwhile, the meaning of the terms described in this application should be understood as follows.

Terms such as “first” and “second” are used to distinguish one component from another component, and the scope of rights should not be limited by these terms. For example, a first component may be named a second component, and similarly, the second component may also be named a first component.

When a component is referred to as being “connected” to another component, it should be understood that it may be directly connected to the other component, but that other components may exist in between. On the other hand, when a component is referred to as being “directly connected” to another component, it should be understood that there are no other components in between. Meanwhile, other expressions that describe the relationship between components, such as "between" and "immediately between" or "neighboring" and "directly neighboring" should be interpreted similarly.

Singular expressions should be understood to include plural expressions unless the context clearly indicates otherwise, and terms such as “comprise” or “have” refer to implemented features, numbers, steps, operations, components, parts, or them. It is intended to specify the existence of a combination, and should be understood as not excluding in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

For each step, identification codes (e.g., a, b, c, etc.) are used for convenience of explanation. The identification codes do not explain the order of each step, and each step clearly follows a specific order in context. Unless specified, events may occur differently from the specified order. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the opposite order.

All terms used herein, unless otherwise defined, have the same meaning as commonly understood by a person of ordinary skill in the field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as consistent with the meaning they have in the context of the related technology, and cannot be interpreted as having an ideal or excessively formal meaning unless clearly defined in the present application.

1 is a diagram showing the schematic configuration of an elevator system including a heater for an actuator according to the present invention.

Referring to FIG. 1, the elevator system 100 according to one embodiment may include an elevator (E/V) machine room 110 and a remote management system 130.

The E/V machine room 110 may correspond to a separate space containing an elevator driver and driver-related devices. The E/V machine room 110 is usually provided at the top of the hoistway and is equipped with a traction machine, electric motor, control panel, and governor. In one embodiment, the E/V machine room 110 may further include a heater for an actuator. The heater for the actuator may be disposed inside or outside the actuator and can heat the actuator to prevent the temperature of the actuator from falling to a low temperature. The heater for the actuator can also ensure that the temperature of the E/V machine room 110 space is appropriately maintained. Here, the driver is an elevator part that drives and stops the elevator, and may correspond to a power generating device consisting of an electric motor, brake, pulley, etc. For example, the heater for the driver is operated so that the room temperature of the E/V machine room 110 does not fall below 5°C or exceed 40°C.

The E/V machine room 110 can be connected to the remote management system 130 through a network, and the operation of the heater for the driver can be remotely controlled through the remote management system 130.

The remote management system 130 remotely monitors the operation status of the elevator and various signals to quickly and accurately handle elevator malfunctions and maintain the condition of the elevator. In one embodiment, the remote management system 130 may be connected to the E/V machine room 110 through a wired or wireless network, and may include at least one of time, season, temperature, weather, and elevator usage based on the installation location of the elevator to be managed. The environmental context including the can be collected, and based on the collected environmental context, the operation of the heater for the driver can be remotely controlled so that the temperature of the driver in the E/V machine room 110 does not fall below a preset temperature. For example, when the preset temperature is 0 degrees Celsius, the remote management system 130 may provide a heater control signal to prevent the temperature of the driver from falling below zero degrees. Here, the remote management system 130 can transmit the environmental context to the E/V machine room 110 and control the operation of the heater for the actuator through the control panel installed in the E/V machine room 110.

FIG. 2 is a diagram showing the detailed configuration of the elevator system in FIG. 1.

Referring to FIG. 2, the elevator system 100 is installed in the E/V machine room 110 and includes a terminal 210, a main control panel 230, an actuator 250, and a heater connected to the remote management system 130 through a network. It may be configured to include (270).

The terminal 210 may be connected to the remote management system 130 through a wired or wireless network and may receive a heater control signal from the remote management system 130. In one embodiment, when a heater control signal is received from the remote management system 130, the terminal 210 provides a control signal to increase the temperature of the driver 250 to the main control panel 230 or sends a heater operation signal to the heater ( 270) to operate the heater 270.

In one embodiment, the remote management system 130 collects data on the state of the elevator through the terminal 210, analyzes elevator operation and failure states, and remotely maintains and manages the elevator. The remote management system 130 may collect environmental context including at least one of time, season, temperature, weather, and usage based on the installation location of the elevator to be managed. The remote management system 130 may provide a heater control signal to the terminal 210 when the temperature of the driver 250 is below a preset temperature based on the collected environmental context. The remote management system 130 operates the heater 270 to increase the internal temperature of the driver 250 when the minimum temperature of the E/V machine room 110 is below zero or expected to be below freezing due to climate change. Control signals can be provided. Based on the environmental context, the remote management system 130 controls the operation of the heater 270 by preventing the heater 270 from operating even when the temperature is below zero or expected to be below zero during early morning hours when the elevator usage is extremely low or when there is no usage. You can save the power needed. The remote management system 130 may provide a heater operation control signal to operate the heater 270 before the elevator usage increases. In one embodiment, the remote management system 130 may provide a heater operation control signal to operate the heater 270 just before the elevator usage exceeds a certain standard amount based on the elevator operation history.

The remote management system 130 transmits a heater operation control signal to remotely force the heater 270 to operate, or transmits environmental context including sub-zero weather information to operate the heater 270 through the main control panel 230. You can also have them do it.

When the terminal 210 receives a heater control signal from the remote management system 130, it can control the heater 270 to operate according to the heater control signal. When the terminal 210 receives environmental context including sub-zero weather information from the remote management system 130, the terminal 210 may transmit the received environmental context to the main control panel 230.

The main control panel 230 controls elevator operations, such as the movement of the elevator car, the operation of the actuator, and the sensor detection function that determines the location of each floor. The main control panel 230 stores operation programs, system specifications, information on elevator status, operation history data, etc., and controls each configuration so that the elevator operates according to the operation program. In one embodiment, the main control panel 230 may control the operation of the driver heater 270 based on the surrounding temperature to increase the temperature of the driver 250. The main control panel 230 can collect ambient temperature through a sensor detection function and receive a heater control signal or environmental context from the remote management system 130 through the terminal 210. When the minimum temperature in the E/V machine room 110 space is below zero or expected to be below zero, the main control panel 230 operates the heater 270 to prevent the driver 250 from falling below the preset minimum temperature to operate the driver at low temperature ( 250) can prevent abnormal operation. Here, the main control panel 230 can operate the heater 270 so that the surrounding temperature of the driver 250 does not fall into a low temperature state that deviates from the design of the permanent magnet.

In one embodiment, the main control panel 230 installs a temperature sensor in the E/V machine room 110 and compares the room temperature measured by the temperature sensor with the preset minimum temperature so that the room temperature is below the preset minimum temperature. If it falls to , the heater 270 can be operated to raise the room temperature to above the preset minimum temperature. Here, the minimum temperature is set to 0°C and the heater 270 can be operated when the minimum temperature falls below zero. In one embodiment, the main control panel 230 may detect the internal temperature of the driver 250 and operate the heater 270 based on the detected internal temperature of the driver 250.

In one embodiment, the main control panel 230 may operate the heater 270 before the elevator usage increases based on the elevator usage. Here, elevator usage can be calculated based on operation history data. The main control panel 230 may receive elevator usage from the environmental context received from the remote management system 130 or may directly calculate the elevator usage. Based on the elevator usage, the main control panel 230 can save energy by stopping the operation of the heater 270 when the usage of the elevator is less than the preset minimum usage or during times when there is no usage.

Figure 3 is an example diagram showing the number of elevator operations by time slot.

Referring to FIG. 3, the main control panel 230 operates the elevator by controlling the operation of the driver 250 based on call signals from each floor and stores the elevator operation history information. The remote management system 130 is connected to the terminal 210 through wired or wireless communication and can collect operation history information of the elevator stored in the main control panel 230 connected to the terminal 210. The remote management system 130 can calculate the amount of elevator usage based on the collected elevator operation history information. The graph showing the number of elevator operations by time slot shown in Figure 3 shows the operation history for 15 days. From 0:00 to 8:00, the number of operations per hour was mostly 5 or less, and there were many times when the elevator did not operate for an hour. However, it can be seen that the number of elevator operations increases from 9 o'clock.

In the elevator system 100 including a heater for an actuator according to an embodiment, the heater 270 is not operated from 0 o'clock to 8 o'clock in consideration of the number of elevator operations per time period, but just before 9 o'clock when the number of elevator operations increases rapidly. The heater 270 can be controlled to operate.

Returning to FIG. 2 , the main control panel 230 can control the heater 270 according to preset conditions by combining elevator usage and room temperature information of the E/V machine room 110 where the driver 250 is installed.

The driver 250 is located in the E/V machine room 110 and drives the elevator car up and down using a rope. In one embodiment, the driver 250 operates under the control of the main control panel 230. The actuator 250 is a power generating device consisting of an electric motor, brake, and pulley. Here, the electric motor consists of a permanent magnet, winding, iron core, etc.

At least one heater 270 is disposed inside or outside the driver 250 to increase the temperature of the driver 250 and prevent abnormal operation of the driver 250 in a low temperature state. In one embodiment, the heater 270 is disposed inside or outside the driver 250 and receives power under the control of the main control panel 230 and generates heat to heat the driver 250. It may be configured as an electric heater. . When the electric heater is placed outside the driver 250, the indoor temperature of the E/V machine room 110 is heated by heat generation, and the heated air is delivered to the inside of the driver 250, thereby lowering the temperature of the driver 250. Do not allow the temperature to fall below the preset minimum temperature. Here, the heated air delivered into the driver 250 can increase the temperature of the permanent magnet of the electric motor.

In one embodiment, the heater 270 can increase the temperature of the permanent magnet inside the driver 250 in a short time using the principle of high-frequency induction heating.

High-frequency induction heating uses the electromagnetic induction effect where a permanent magnet is inserted into and removed from the center of a coil-shaped conductor, and the magnetic field changes and a current flows through the conductor. By flowing alternating current through the coil instead of the permanent magnet, an alternating magnetic flux is generated, thereby inducing the heated object. Allow current (eddy current) to flow. This induced current generates Joule heat due to eddy current loss, and heating with this generated heat is called induction heating. In this case, the characteristic of the eddy current is that it is concentrated and induced in the part of the object close to the coil, and the induced current tends to flow strongly around the surface of the object and flows weakly inside the object. This principle enables efficient rapid heating by concentrating energy on the necessary parts of the object to be heated.

The heater 270 may use the internal winding of the driver 250 to induce eddy current loss and hysteresis loss in the internal permanent magnet of the driver 250 by applying a high-frequency voltage or current to the winding. If eddy current loss and hysteresis loss occur in the permanent magnet inside the driver 250, heat is generated in the permanent magnet.

The main control panel 230 may apply a high-frequency voltage or current to the internal winding of the driver 250 to generate heat in the permanent magnets inside the driver 250, thereby increasing the internal temperature of the driver 250.

Figure 4 is a flowchart for explaining an operation method of an elevator system including a heater for an actuator according to an embodiment.

Referring to FIG. 4, the elevator system 100 may collect the environmental context of the elevator system 100 through the network-connected terminal 210 in the remote management system 130 (step S410). Here, the environmental context may include at least information about time, temperature, and elevator usage.

The elevator system 100 may determine whether to operate the heater 270 based on the environmental context collected by the remote management system 130 (step S430). In one embodiment, the remote management system 130 determines that there is a risk that the temperature inside the actuator 250 will fall below freezing when the minimum temperature is below zero or expected to be below freezing due to temperature changes, and operates the heater 270. You can decide. In one embodiment, the remote management system 130 may determine not to operate the heater 270 regardless of the temperature in the early morning hours when the elevator usage is very low or when the elevator is not being used.

When the remote management system 130 decides to operate the heater 270, the elevator system 100 can receive a heater operation control signal and remotely operate the heater 270 to increase the temperature inside the driver 250. (Step S450). In one embodiment, the heater 270 is disposed outside the driver 250 and heats the air in the E/V machine room 110 through heat generation to increase the temperature of the permanent magnet inside the driver 250 with the heated air. You can. In one embodiment, the heater 270 uses the internal winding of the driver 250 to apply high-frequency voltage or current to the winding to induce eddy current dissipation and hysteresis loss in the permanent magnet, thereby generating heat in the permanent magnet and increasing the temperature. .

An elevator system including a heater for an actuator according to an embodiment can maintain the E/V machine room space in a specific temperature range by placing a heater outside or inside the actuator in the E/V machine room, and the surrounding temperature is low. In this case, the internal temperature of the actuator can be raised to allow the elevator car to operate normally even at low temperatures.

Although the present invention has been described above with reference to preferred embodiments, those skilled in the art may make various modifications and changes to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that you can do it.

100: Elevator system
110: E/V machine room 130: Remote management system
210: terminal 230: main control panel
250: driver 270: heater

Claims (10)

actuator;
a heater disposed inside or outside the driver and generating heat to heat the driver to increase the temperature of the driver; and
A main control that operates the heater by supplying power for heat generation to the heater based on the ambient temperature and elevator usage and controls the heater to stop operation when the elevator usage is less than the preset minimum usage or during non-usage times. An elevator system including a heater for an actuator comprising a half.
delete actuator;
a heater that increases the temperature of the driver by including a winding for high-frequency induction heating of the permanent magnets inside the driver; and
A heater for an actuator including a main control panel that controls the operation of the heater by applying a high-frequency voltage or current for induction heating to the heater according to preset conditions by combining elevator usage and room temperature information of the machine room where the actuator is installed. Including elevator system.
The method of claim 1, wherein the main control panel is
An elevator system including a heater for an actuator, wherein the heater is operated so that the actuator does not fall below a preset minimum temperature.
According to claim 4, the main control panel is
An elevator system including a heater for an actuator, characterized in that the heater is operated based on the elevator usage before the elevator usage increases to a preset usage.
delete According to claim 4, the main control panel is
An elevator system including a heater for an actuator, characterized in that the heater is controlled according to preset conditions by combining elevator usage and room temperature information of the machine room where the actuator is installed.
According to paragraph 1,
It further includes a terminal connected to a network with a remote management system and remotely operating the heater through the remote management system,
The remote management system is
Based on the installation location of the elevator, environmental context including at least one of time, season, temperature, weather, and usage is collected, and based on the collected environmental context, if the temperature of the driver is below a preset temperature, a heater control signal is generated. An elevator system including a heater for an actuator provided as a terminal.
The method of claim 8, wherein the terminal
An elevator system including a heater for an actuator, wherein when a heater control signal is received from the remote management system, a control signal for increasing the temperature of the actuator and a heater operation signal are provided to the main control panel or the heater.
The method of claim 1, wherein the driver
It is a power generating device that includes an electric motor, brake, and pulley,
The electric motor consists of a permanent magnet, winding, and iron core,
The main control class is
An elevator system including a heater for an actuator, characterized in that high-frequency induction heating of the permanent magnet by applying a high-frequency voltage or current to the winding or generating Joule heat by applying a current to the winding.