Elevator system and elevator control method

Abstract

Provided is an elevator that can be supplied with power from both a commercial power source and a power source from a vehicle having a power supply function, the elevator comprising: an input power source switching unit; a power supply circuit that uses the power source selected by the input power source switching unit and generates a driving power supply to be supplied to a hoist for driving an elevator car; and a control unit that controls the generation of the driving power supply. Upon selection of the power source from the vehicle by the power source switching unit, the control unit causes the power supply circuit to generate a driving power supply that limits the acceleration of the elevator car so as to be lower than the acceleration thereof when the commercial power source is used.

Description

[[Technical Field]]

[0001] The present invention relates to an elevator system and an elevator control method. [[Background Art]]

[0002] Since elevators operate by receiving power supply from commercial power, they stop during a power outage. For this reason, various elevators that can operate even during power outages have been proposed. For example, as an elevator installed in a building, it has been proposed that the elevator be provided with a connection terminal for an electric vehicle, so that it can operate by power supply from a battery in the connected electric vehicle during a power outage. By adopting a configuration in which an electric vehicle can be connected to an elevator, the elevator can operate even during a power outage. Therefore, even in the event of a long-term power outage such as when a disaster occurs, services such as transporting passengers can be continued.

[0003] By the way, in controlling the operation of an elevator, conventionally no particular distinction is made between cases where power is supplied from commercial power and cases where power is supplied from an electric vehicle. Therefore, depending on the amount of power that can be supplied from the connected electric vehicle, there is a possibility that sufficient power for operating the elevator cannot be provided. Further, even if sufficient power can be temporarily supplied from the electric vehicle, if a large amount of power is supplied for operating the elevator, the remaining battery capacity of the electric vehicle will decrease early, and the continuous operation time of the elevator will be shortened.

[0004] Patent Document 1 describes a technology in which an operation mode changeover switch is provided in an elevator monitoring room, and when a power shortage situation is expected such as when using cooling in summer, peak power suppression operation is performed by timer-based switching or manual switching. [[Prior Art Document]] [[Patent Document]]

[0005] [[Patent Document 1]] Japanese Patent Publication No. 2006-111258 [Overview of the project] [Problems that the invention aims to solve]

[0006] As described in Patent Document 1, if an operating mode changeover switch is provided in the elevator's control room, it becomes possible to perform peak power suppression operation by switching this switch. However, if we assume that an electric vehicle is connected to an elevator using the configuration described in Patent Document 1, there is a possibility that the elevator may be operated without being operated by the operating mode switch, and the elevator may be operated with an improper power supply from the electric vehicle.

[0007] The present invention aims to provide an elevator system and elevator control method that enable proper operation using power from a vehicle, such as an electric vehicle, when the elevator is connected to the vehicle. [Means for solving the problem]

[0008] To solve the above problems, for example, the configuration described in the claims may be adopted. The present invention includes several means for solving the above problems, but to give one example, in an elevator system capable of receiving power from both commercial power and power from a vehicle having a power supply function, the system includes an input power switching unit that selects between commercial power and power from a vehicle, a power supply circuit that generates a drive power supply to be supplied to a hoisting machine that drives the elevator car using the power selected by the input power switching unit, and a control unit that controls the generation of the drive power supply in the power supply circuit. Here, the control unit is The control unit obtains the load capacity of the elevator car based on the output of the load sensor installed in the elevator car, and also communicates with the vehicle to obtain the permissible value of the amount of power that can be supplied from the vehicle. When commercial power is selected in the input power switching unit, the power supply circuit generates a drive power supply that sets the acceleration of the elevator car to a predetermined acceleration, and when power from the vehicle is selected in the input power switching unit, Based on the load capacity, the weight of the counterweight, and the direction of travel of the elevator car, the power consumption of the hoisting machine during acceleration or deceleration is calculated. If the calculated power consumption exceeds the allowable value, the acceleration during starting or deceleration during stopping of the elevator car is restricted more than under normal conditions to limit power consumption to below the allowable value. The power supply for driving the vehicle is generated by the power supply circuit. [Effects of the Invention]

[0009] According to the present invention, power consumption when driving an elevator with power from a vehicle having a power supply function can be reduced, thereby lowering the power supply burden on the vehicle. This reduces the burden on the battery installed in the vehicle and extends the operating time of the elevator. Other issues, configurations, and effects not mentioned above will be clarified by the following description of the embodiments. [Brief explanation of the drawing]

[0010] [Figure 1] This is a block diagram showing an example configuration of an elevator system according to one embodiment of the present invention. [Figure 2] This flowchart shows an example of the operation of an elevator system according to one embodiment of the present invention. [Figure 3] This figure shows an example of the change in electrical energy during powered operation when driven by a power source from an electric vehicle, according to one embodiment of the present invention. [Figure 4] This figure shows an example of the change in the amount of electricity during regenerative driving when powered by an electric vehicle, according to one embodiment of the present invention. [Figure 5] This figure shows an example of the change in power consumption during powered operation using a commercial power supply, according to one embodiment of the present invention. [Figure 6] This figure shows an example of the change in power consumption during powered operation using a commercial power supply, according to one embodiment of the present invention. [Figure 7] This figure shows an example of uphill operation (powered operation) in a state where the weight of the elevator car is heavier than the counterweight, according to one embodiment of the present invention. [Figure 8] This figure shows an example of uphill operation (regenerative braking) according to one embodiment of the present invention, where the weight of the elevator car is lighter than the counterweight. [Figure 9] This figure shows an example of downhill operation (regenerative braking) in a state where the weight of the elevator car is heavier than the counterweight, according to one embodiment of the present invention. [Figure 10]It is a diagram showing an example of downward operation (powering operation) when the weight of the car according to an embodiment of the present invention is lighter than that of the counterweight. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an elevator system and an elevator control method according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0012] [Configuration of Elevator System] Figure 1 is a configuration diagram of the elevator system in the present embodiment. The elevator system of the present embodiment includes an input power switching unit 20, and a commercial power supply 11 and a vehicle power supply 12 are supplied to the input power switching unit 20.

[0013] The commercial power supply 11 is a power supply such as three-phase alternating current 200V supplied from an electric power company to a building where an elevator is installed. The vehicle power supply 12 is, for example, power discharged from a battery mounted on an electric vehicle, and is supplied via a charging and discharging device connected to the battery of the electric vehicle. In this case, the power discharged from the battery of the electric vehicle is direct current power, which is converted into alternating current power of the same voltage as the commercial power supply 11 in the charging and discharging device or inside the vehicle. However, during normal times other than power outages, only the commercial power supply 11 is supplied to the input power switching unit 20.

[0014] The input power switching unit 20 includes a changeover switch 21, and executes input power switching processing for switching between the commercial power supply 11 and the vehicle power supply 12. The changeover switch 21 is set to select the commercial power supply 11 during normal times, and is set to automatically select the vehicle power supply 12 when the commercial power supply 11 is not supplied due to the occurrence of a power outage.

[0015] In the case where the input power switching unit 20 is configured to automatically select a power source, when both the commercial power source 11 and the vehicle power source 12 are supplied, the input power switching unit 20 selects the commercial power source 11; and when either one of the commercial power source 11 and the vehicle power source 12 is supplied, the input power switching unit 20 selects the supplied power source. The input power switching unit 20 basically performs such power selection even when it selects a power source according to an instruction from the control unit 40.

[0016] The input power selected by the input power switching unit 20 is supplied to the power circuit 30. The power circuit 30 includes a converter 31 and an inverter 32, and performs driving power generation processing. The converter 31 converts the input power such as three-phase alternating current selected by the input power switching unit 20 into direct-current power. The inverter 32 converts the direct-current power converted by the converter 31 into three-phase alternating-current driving power to be supplied to the induction motor 60 which is a hoisting machine. When the inverter 32 performs conversion to the driving power, the voltage, current and frequency are set under the control of the control unit 40.

[0017] A rotary encoder 50 is attached to the induction motor 60. The rotary encoder 50 detects the rotational speed and rotation angle of the induction motor 60. Information on the rotational speed and rotation angle of the induction motor 60 detected by the rotary encoder 50 is supplied to the control unit 40 and used for controlling the inverter 32.

[0018] A rotating shaft of the induction motor 60 is connected to a speed reducer 61, and the induction motor 60 rotates a pulley 104 via the speed reducer 61. A main rope 103 of an elevator 100 is wound around the pulley 104. A car 101 is connected to one end of the main rope 103, and a counterweight 102 is connected to the other end thereof. Therefore, the pulley 104 rotates under the drive of the induction motor 60, causing the elevator car 101 to move up and down within the hoistway. A brake (not shown) is installed in the mechanism that rotates the pulley 104. When the elevator car 101 starts moving, it is necessary to release the brake, and when it stops at the destination floor, it is necessary to activate the brake. Needless to say, power is consumed when releasing the brake and when activating the brake.

[0019] The control unit 40 includes a driving control unit 41, a driving / position control unit 42, and a vector control / load amount calculation unit 43. The operation control unit 41 controls the operation of the elevator car 101, such as its movement and stopping. The travel and position control unit 42 controls the travel and stopping position of the elevator car 101 based on instructions from the operation control unit 41. Here, the travel and position control unit 42 determines the travel position and stopping position of the elevator car 101 based on information detected by the rotary encoder 50, and controls the generation of the drive power supply in the inverter 32 to achieve the state instructed by the operation control unit 41.

[0020] The vector control / load calculation unit 43 performs vector control of each phase of the inverter 32 based on the information detected by the rotary encoder 50 and the current and voltage of the drive power supply generated by the inverter 32, thereby generating an appropriate drive power supply. Here, the vector control / load calculation unit 43 determines the load capacity of the elevator car 101 from the detection information of a load sensor (not shown) installed on the elevator car 101, and performs control to generate a drive power supply suitable for the load capacity.

[0021] Furthermore, the control unit 40 obtains information from the input power switching unit 20 regarding which power source, commercial power supply 11 or vehicle power supply 12, is selected. If vehicle power supply 12 is selected, the control unit 40 also obtains information on the battery level of the connected vehicle (electric vehicle) and the permissible value of the amount of power that can be supplied from the battery. This battery level and the permissible value of the amount of power that can be supplied from the battery are usually obtained through communication between the control unit 40 and the vehicle, but a terminal unit (not shown) connected to the vehicle may detect the discharge state from the battery and determine the permissible value.

[0022] The control unit 40 is composed of a computer, which is an information processing device, as shown in Figure 1. Specifically, as shown in Figure 1, the computer acting as the control unit 40 includes a CPU (Central Processing Unit) 40a, a work memory 40b, a storage unit 40c, and an interface 40d for sending and receiving data with other devices. For the memory unit 40c, for example, an HDD (Hard Disk Drive), an SSD (Solid State Drive), or semiconductor memory can be used. The CPU 40a executes the program stored in the memory unit 40c on the work memory 40b, thereby configuring the previously described driving control unit 41, driving / position control unit 42, and vector control / load amount calculation unit 43. It should be noted that the control unit 40 is configured as a computer equipped with a CPU 40a, which is just one example. For example, part or all of the control unit 40 may be implemented using dedicated hardware such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit).

[0023] [Control processing during elevator operation] Figure 2 is a flowchart showing the processing flow when the control unit 40 moves the elevator car 101 in the elevator system of this embodiment. The control unit 40 executes the process shown in this flowchart when it starts the elevator car 101 (step S11).

[0024] When processing begins in step S11, the control unit 40 determines whether or not the commercial power supply 11 is experiencing a power outage as the current input power supply state (step S12). In step S12, if the current input power state is that the commercial power supply 11 is not experiencing a power outage (No. in step S12), the power supply circuit 30 generates a drive power supply using the commercial power supply 11, and the control unit 40 performs operation control in normal mode without power suppression (step S19).

[0025] In step S19, when the normal mode is set, the induction motor 60 starts rotating under the control of the control unit 40 by generating a drive power supply, and acceleration (step S16), deceleration (step S17), and stopping (step S18) are performed in sequence to start the elevator operation, and the elevator car 101 travels from the stopping floor to the destination floor. In other words, in normal mode with commercial power supply 11 as the input power supply, acceleration and deceleration are performed at the normal (predetermined) acceleration set for the elevator.

[0026] Furthermore, in step S12, if the current input power state is that the commercial power supply 11 is out of service (Yes in step S12), the power supply circuit 30 generates a drive power supply using the vehicle power supply 12. When generating this drive power supply, first, the vector control / load amount calculation unit 43 of the control unit 40 calculates the load amount of the elevator car 101 and the weight of the counterweight 102 from the detection information of the load sensor (step S13). Then, the vector control / load amount calculation unit 43 calculates the amount of power consumed to obtain the drive power supply during acceleration and deceleration based on the information of whether the elevator car 101 is operating uphill or downhill, and the weight calculated in step S13 (step S14).

[0027] Subsequently, the vector control / load calculation unit 43 determines whether the amount of power consumed in step S14 is less than the predetermined discharge tolerance value of the vehicle's (electric vehicle's) battery (step S15). In step S15, if the power consumption is less than the battery's discharge limit (Yes in step S15), the control unit 40 controls the elevator to accelerate when it starts operating (step S16), decelerate before stopping the elevator (step S17), and stop the elevator (step S18), and the elevator car 101 travels from the stopping floor to the destination floor. In this way, when the power consumption is less than the battery's discharge limit, the elevator is operated without power suppression.

[0028] In step S15, if the power consumption exceeds the battery's discharge limit (No. in step S15), the control unit 40 switches to an operating mode that performs power suppression control (step S20). With this power suppression control operating mode set, the control unit 40 controls the acceleration by starting the elevator operation in step S16, the deceleration of the elevator in step S17, and the stopping of the elevator in step S18, and the elevator car 101 travels from the stopping floor to the destination floor.

[0029] [Examples of specific driving conditions] Next, we will explain specific operating conditions when power suppression control is performed and when it is not. The control performed when power suppression control is performed is the control performed in step S20 of the flowchart in Figure 2. In contrast, the control performed when power suppression control is not performed is the control performed when [Yes] is selected in step S15 of the flowchart in Figure 2, or the control in step S19 where power suppression is not performed.

[0030] When the elevator car 101 is driven by the induction motor 60, depending on whether the load of the elevator car 101 or the weight of the counterweight 102 is greater, and whether the direction of travel of the elevator car 101 is uphill or downhill, there are cases where powered operation is performed and cases where regenerative operation is performed.

[0031] For example, as shown in Figure 7, when elevator car 101 is moving upwards from the first floor or elsewhere, there may be many passengers on board, and the load of elevator car 101 may be heavier than the weight of the counterweight 102. In such cases, the induction motor 60 performs power operation using the rotational driving force it generates during the upward movement of elevator car 101.

[0032] In contrast, as shown in Figure 8, consider the case where the elevator car 101 is traveling uphill from the first floor or elsewhere, with only a few passengers on board, and the load on the elevator car 101 is lighter than the weight of the counterweight 102. In such a case, the elevator car 101 starts moving when the brakes are released, and the induction motor 60 performs regenerative operation to control the speed.

[0033] Figures 7 and 8 illustrate examples of uphill operation, but during downhill operation, regenerative braking is used when the weight is heavy, and powered operation is used when the weight is light. Specifically, as shown in Figure 9, consider the case where elevator car 101 is descending from the 6th floor or elsewhere, and there are many passengers on board, so that the load of elevator car 101 is heavier than the weight of counterweight 102. In this case, the induction motor 60 starts the elevator car 101 moving when the brake is released during the descending operation of elevator car 101, and performs regenerative operation to control the speed.

[0034] In contrast, as shown in Figure 10, consider the case where the elevator car 101 is descending from the 6th floor or elsewhere, with only a few passengers on board, and the load on the elevator car 101 is lighter than the weight of the counterweight 102. In this case, the induction motor 60 performs power operation using the rotational driving force it generates during the descending operation of the elevator car 101.

[0035] Thus, elevators can operate under powered operation as shown in Figures 7 and 10, or under regenerative operation as shown in Figures 8 and 9. In this embodiment of the elevator system, when operating using the vehicle power supply 12 during a power outage, power reduction operation may be performed at step S20 of the flowchart in Figure 2. Figure 3 shows an example of the change in power consumption from the start to the stop during traction operation under this power reduction operation condition. In Figure 3, the vertical axis represents power consumption (power resource) in kVA, and the horizontal axis represents time. The vertical and horizontal axes are the same in Figures 4 to 6, which will be described later. The power shown in Figures 3 to 6 is the power output from the inverter 32, and is the total power consumed as an elevator, including the power consumed by the induction motor 60 as well as power for braking, etc.

[0036] As shown in Figure 3, during powered operation, when starting from a standstill, the maximum amount of electrical energy is required during the initial acceleration. Then, during subsequent travel at a constant speed, the amount of electrical energy is maintained at a level slightly lower than the maximum, and as the vehicle approaches the stopping point, the amount of electrical energy gradually decreases until it returns to the level before travel when the vehicle stops.

[0037] In the example shown in Figure 3, power-restricted operation is performed during acceleration, so the maximum amount of power consumed during the initial acceleration is limited compared to normal operation, for example, to 8 kVA. As a result, the acceleration at the start of travel (acceleration) is kept lower than the acceleration in normal mode. Similarly, the acceleration (deceleration) when stopping travel (deceleration) is also kept lower than the acceleration in normal mode. However, if the battery capacity is 8 kVA, for example, the amount of power consumed during deceleration will not exceed the battery capacity, so it is not necessary to perform the process of suppressing acceleration when stopping.

[0038] Figure 4 shows an example of the change in the amount of electricity consumed from the start to the stop of operation during regenerative operation while power reduction operation is in place. As shown in Figure 4, in regenerative driving, when starting to drive from a standstill, the maximum amount of power is required during the initial acceleration. After that, when driving at a constant speed, the vehicle maintains a state where almost no power is consumed, and as it approaches the stopping point, a small amount of power is consumed to bring it to a stop, and then the power level returns to the level before driving when it stops.

[0039] In the regenerative driving operation during power suppression shown in Figure 4, power consumption is significantly lower than during powered driving shown in Figure 3. In the control at step S19 of the flowchart in Figure 2, power suppression is not performed. However, in this example, in order to reduce battery consumption, the acceleration at the start of driving (acceleration) and at the stop (deceleration) during regenerative driving is kept lower than the acceleration in normal mode.

[0040] Here, we will explain an example of power operation in normal mode without power suppression (Figure 5) and an example of regenerative operation in normal mode (Figure 6). In normal operation without power suppression, as shown in Figure 5, when starting from a standstill, the maximum amount of power is required during the initial acceleration. Then, during subsequent travel at a constant speed, the power level is maintained at a slightly lower level than the maximum, and as the vehicle approaches the stopping position, the power level gradually decreases before returning to the level before travel. In the example in Figure 5, since power suppression is not performed, the maximum power level during the initial acceleration is, for example, 10 kVA, and the acceleration at the start of travel (acceleration) and the acceleration (deceleration) at the stop of travel (deceleration) are not restricted.

[0041] Furthermore, during regenerative operation in normal mode without power suppression, as shown in Figure 6, when starting to travel from a standstill, the maximum amount of power is required during the initial acceleration. Then, while traveling at a constant speed thereafter, the vehicle maintains a state where it consumes almost no power, and as it approaches the stopping point, a small amount of power is consumed to bring it to a stop, and then it returns to the power level before travel. In the normal mode of regenerative operation shown in Figure 6, the amount of power is set at the start of driving (acceleration) and at stopping (deceleration) during regenerative operation, just as it is during powered operation. Furthermore, even in normal mode of regenerative operation, the maximum amount of power during the initial acceleration and the amount of power at stopping are greater than in the power-suppressed mode shown in Figure 4.

[0042] As described above, according to the elevator system of this embodiment, when a power outage occurs in the commercial power supply and the battery of a vehicle such as an electric vehicle is used as the input power source, the power consumption of the elevator is kept below the allowable power capacity of the vehicle's battery. This process of keeping the power consumption below the allowable power capacity is mainly achieved by suppressing the acceleration when the elevator car 101 starts up and by suppressing the acceleration (deceleration) when it stops.

[0043] In the operating conditions shown in Figures 3 and 4, the acceleration (deceleration) at a stop is relatively small, and there is no need to suppress the acceleration at a stop. However, when the elevator car 101 is almost full and the load is large, the power consumption at a stop may exceed the allowable power capacity of the vehicle's battery, making it important to limit the acceleration at a stop.

[0044] As described above, according to the elevator system of this embodiment, when the vehicle's battery is used during a power outage, the power consumption of the elevator is automatically reduced to below the vehicle's battery's allowable power capacity. Therefore, when the vehicle's battery is used, the burden on the vehicle's battery can be automatically reduced, and battery degradation can be suppressed. In addition, because the power consumption of the elevator is reduced, the elevator can be operated for a longer period of time using the battery.

[0045] Furthermore, when operating with the vehicle's battery power selected in the input power switching unit 20, in addition to the acceleration limitation described above, the speed (maximum speed) of the elevator car 101 may be limited to a lower speed than the normal speed. By limiting the speed, power consumption can be reduced, which in turn allows for longer elevator operation times using battery power.

[0046] Furthermore, as explained in Figure 3 regarding power consumption during traction, a large amount of power is consumed during traction. Therefore, by limiting acceleration during traction, it becomes possible to appropriately reduce the burden on the battery.

[0047] Furthermore, since the highest power consumption occurs during acceleration, especially at startup, limiting acceleration during powered operation can more effectively reduce the burden on the battery.

[0048] Furthermore, limiting the acceleration of the elevator car when it stops can further reduce the burden on the battery.

[0049] [Differentiation] The embodiments described above are explained in detail for the purpose of clearly illustrating the present invention, and are not necessarily limited to those comprising all the configurations described.

[0050] For example, in the above-described embodiment, an electric vehicle equipped with a battery was used as the vehicle connected to the elevator system. However, various other vehicles capable of supplying power, such as a hybrid vehicle equipped with an engine and a battery, or a vehicle that generates electricity using hydrogen as fuel, may also be connected. Even in the case of these vehicles, there is a limit to the amount of electricity that can be supplied externally, so the process described in this embodiment will function effectively.

[0051] Furthermore, although the above-described embodiment example described an example with only one elevator car 101, it may also be applied to elevators with multiple elevator cars. In the case of an elevator with multiple elevator cars, the simplest control method when receiving power supply from the vehicles is to limit the operation of one elevator car to one and stop service from the other cars.

[0052] On the other hand, while providing a transport service using multiple elevator cars, the power consumption of all elevator cars may be kept below the allowable power capacity of the vehicle's battery, as described in this embodiment.

[0053] As a process to address this, for example, the control unit 40 may control the system so that multiple elevator cars do not operate simultaneously when power is supplied from the vehicle. For example, if the system consists of car 1 and car 2, it is conceivable that the elevator cars of car 1, which are currently in motion, could start operating after arriving at their respective floors, and then, after car 2 has stopped, car 1 could start operating again, thus operating in an alternating manner. Even when each of these cars is operating, it is possible to perform the process described in this embodiment to reduce power consumption to below the allowable power capacity of the vehicle's battery. However, if each of the multiple units consumes little power through regenerative braking and the total power consumption remains within the vehicle's battery capacity, then multiple units may be operated simultaneously.

[0054] Furthermore, the configuration diagram shown in Figure 1 only shows control lines and information lines that are deemed necessary for explanation, and does not necessarily show all control lines and information lines in the actual product. In reality, it is safe to assume that almost all components are interconnected. Furthermore, if the control unit 40 that performs the control processing described in this embodiment is configured as an information processing device such as a computer, the program that implements the control unit 40 may be stored in non-volatile storage or memory within the computer, or it may be stored on an external memory, IC card, SD card, optical disc, or other recording medium and transferred from there. [Explanation of Symbols]

[0055] 11...Commercial power supply, 12...Vehicle power supply, 20...Input power switching unit, 21...Changeover switch, 30...Power supply circuit, 31...Converter, 32...Inverter, 40...Control unit, 40a...CPU, 40b...Work memory, 40c...Storage unit, 40d...Interface, 41...Operation control unit, 42...Travel / position control unit, 43...Vector control / Load calculation unit, 50...Rotary encoder, 60...Induction motor, 61...Reduction gear, 100...Elevator, 102...Counterweight, 103...Main rope, 104...Pulley

Claims

1. In an elevator system capable of supplying power from both commercial power and power from a vehicle equipped with a power supply function, An input power switching unit that selects between the commercial power supply and the power supply from the vehicle, A power supply circuit that generates a drive power supply to be supplied to the hoisting machine that drives the elevator car, using the power supply selected by the input power supply switching unit, The aforementioned elevator The power supply circuit includes a control unit that controls the generation of the drive power supply, The control unit acquires the load capacity of the elevator car based on the output of the load sensor installed in the elevator car, and also communicates with the vehicle to acquire an allowable value for the amount of power that can be supplied from the vehicle. When the control unit selects the commercial power supply in the input power supply switching unit, it causes the power supply circuit to generate a drive power supply that sets the acceleration of the elevator car to a predetermined acceleration. When the control unit selects the power supply from the vehicle in the input power supply switching unit, it calculates the power consumption of the hoisting machine during acceleration or deceleration based on the load, the weight of the counterweight, and the direction of travel of the elevator car. If the calculated power consumption is greater than or equal to the allowable value, it causes the power supply circuit to generate a drive power supply that limits the acceleration of the elevator car when starting or the deceleration when stopping to less than the allowable value, thereby limiting the power consumption to less than or equal to the allowable value. Elevator system.

2. The control unit selects the power supply from the vehicle using the input power supply switching unit, and when it limits the acceleration or deceleration of the elevator car to an acceleration or deceleration lower than the predetermined acceleration, it limits the speed of the elevator car to a low speed lower than the normal speed. The elevator system according to claim 1.

3. Multiple of the aforementioned elevators are available. When the control unit selects power from the vehicle using the input power switching unit, it allows the simultaneous operation of the multiple elevator cars if the total power consumption of the multiple elevator cars falls within the allowable value. The elevator system according to claim 1.

4. In an elevator control method for controlling an elevator that can be powered by both commercial power and power from a vehicle with a power supply function, An input power switching process that selects between the commercial power supply and the power supply from the vehicle, A drive power generation process that generates a drive power supply to be supplied to the hoisting machine that drives the elevator car using the power supply selected by the input power switching process, A load amount acquisition process that acquires the load amount of the elevator car based on the output of a load sensor installed in the elevator car, The process of obtaining an allowable value for the amount of power that can be supplied from the vehicle is performed in the execution of communication with the vehicle, When the commercial power supply is selected in the input power supply switching process, a drive power supply is generated by the drive power supply generation process to set the acceleration of the elevator car to a predetermined acceleration; when the power supply from the vehicle is selected in the input power supply switching process, the power consumption of the hoisting machine during acceleration or deceleration is calculated based on the load, the weight of the counterweight, and the direction of travel of the elevator car, and when the calculated power consumption is greater than or equal to the allowable value, a drive power supply is generated by the drive power supply generation process to limit the acceleration of the elevator car when starting or the deceleration when stopping to less than the allowable value compared to normal conditions; including Elevator control method.

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