Elevator control method and device, elevator, readable storage medium and program product

Abstract

An elevator control method and device, an elevator, a readable storage medium and a program product. The elevator (100) comprises a motor (20) and a car (30), the motor (20) being connected to the car (30). The method comprises: acquiring the moving speed of the car (30), the moving speed being positively correlated with the rotation speed of the motor (20); and in response to an elevator braking scenario, when the moving speed is less than or equal to a preset short winding braking threshold, starting a short winding braking function to brake the car (30), the short winding braking function being configured to be started when three phases of the motor (20) are short-circuited. Therefore, when the elevator needs to be braked and the moving speed of the car (30) is less than or equal to the preset short winding braking threshold, the three phases of the motor (20) can be short-circuited, so as to start the short winding braking function for braking, and avoid excessive loss of a brake pad of a brake (50). Meanwhile, because the short winding braking function is started only when the moving speed is smaller than or equal to the preset short winding braking threshold, long-time operation of the short winding braking function can be avoided, thereby ensuring as much as possible normal operation of devices used for achieving the short winding braking function.

Description

Elevator control method and device, elevator, readable storage medium and program product

[0001] Priority information

[0002] This disclosure claims priority and benefits of the patent application with patent application number "202310793755.0" filed with the State Intellectual Property Office of China on June 29, 2023, and incorporates the entire text of it herein by reference. Technical Field

[0003] The present disclosure relates to the technical field of elevator control, and more particularly, to an elevator control method, an elevator control device, an elevator, a non-volatile computer-readable storage medium, and a computer program product. Background Art

[0004] Currently, when an elevator needs to brake, it often uses the brake. However, if only the brake is used for braking, it is easy to cause excessive wear of the brake pads. To solve this problem, in addition to using the brake, the star-sealing contactor is also used to cooperate with the braking. However, running the star-sealing contactor for a long time will also have adverse effects on the star-sealing contactor. For example, long-term operation may cause the star-sealing contactor to overheat, thus affecting its normal operation.

[0005] Summary of the Invention

[0006] Embodiments of the present disclosure provide an elevator control method, an elevator control device, an elevator, a non-volatile computer-readable storage medium, and a computer program product.

[0007] The control method of the disclosed embodiment is applied to an elevator, wherein the elevator includes a motor and a car, wherein the motor and the car are connected, and the method includes obtaining a moving speed of the car, wherein the moving speed is positively correlated with a rotational speed of the motor; and in response to an elevator braking scenario, when the moving speed is less than or equal to a preset star-locking threshold, turning on a star-locking function to brake the car, wherein the star-locking function is configured to be turned on when the three phases of the motor are short-circuited.

[0008] The control device of the disclosed embodiment is applied to an elevator, wherein the elevator comprises a motor and a car, wherein the motor is connected to the car, and the control device comprises a drive controller, wherein the drive controller is used to obtain a moving speed of the car, wherein the moving speed is positively correlated with a rotational speed of the motor; and in response to an elevator braking scenario, when the moving speed is less than or equal to a preset star-locking threshold value, a star-locking function is turned on to brake the car, and the star-locking function is configured to be turned on when the three phases of the motor are short-circuited.

[0009] The elevator of the embodiment of the present disclosure comprises a motor, a car and the control device described in any one of the above embodiments. The motor is connected to the car.

[0010] The non-volatile computer-readable storage medium of an embodiment of the present disclosure includes a computer program. When the computer program is executed by a processor, the processor is caused to execute the control method of any of the above embodiments.

[0011] The computer program product of the embodiments of the present disclosure includes a computer program, and when the computer program is executed by a processor, the control method described in any one of the above embodiments is implemented.

[0012] The elevator control method, elevator control device, elevator, non-volatile computer-readable storage medium, and computer program product disclosed herein first drive a controller to obtain the car's moving speed based on the motor's rotational speed. When braking is required and the car's moving speed is less than or equal to a preset braking threshold, the three phases of the motor are short-circuited to activate the braking function, generating electrical braking force to brake the car. This allows the drive controller to utilize the braking function to prevent excessive wear of the brake pads. Furthermore, because the braking function is only activated when the moving speed is less than or equal to the preset braking threshold, it can also prevent the braking function from operating for extended periods of time, thereby minimizing the normal operation of the components that implement the braking function.

[0013] Additional aspects and advantages of the embodiments of the present disclosure will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0015] FIG1 is a flow chart of an elevator control method according to certain embodiments of the present disclosure;

[0016] FIG2 is a schematic diagram of an elevator scene according to certain embodiments of the present disclosure;

[0017] FIG3 is a partial structural diagram of an elevator according to certain embodiments of the present disclosure;

[0018] FIG4 is a flow chart of an elevator control method according to certain embodiments of the present disclosure;

[0019] FIG5 is a flow chart of an elevator control method according to certain embodiments of the present disclosure;

[0020] FIG6 is a flow chart of an elevator control method according to certain embodiments of the present disclosure;

[0021] FIG7 is a flow chart of an elevator control method according to certain embodiments of the present disclosure;

[0022] FIG8 is a flow chart of an elevator control method according to certain embodiments of the present disclosure;

[0023] FIG9 is a flow chart of an elevator control method according to certain embodiments of the present disclosure;

[0024] FIG10 is a schematic diagram illustrating a connection state between a non-volatile computer-readable storage medium and a processor according to certain embodiments of the present disclosure;

[0025] FIG11 is a schematic diagram illustrating a connection state between a computer program product and a processor according to certain embodiments of the present disclosure. DETAILED DESCRIPTION

[0026] The embodiments of the present disclosure are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present disclosure, and should not be understood as limiting the embodiments of the present disclosure.

[0027] 1 and 2 , an embodiment of the present disclosure provides a method for controlling an elevator. The elevator 100 includes a motor 20 and a car 30 , and the motor 20 and the car 30 are connected. The control method includes:

[0028] Step 011: Obtain the moving speed of the car 30, which is positively correlated with the rotation speed of the motor 20;

[0029] Specifically, referring to Figure 3 , the control method disclosed herein can be applied to the control device 40 of an elevator 100. The control device 40 may include a device capable of implementing a star-locking function, such as a star-locking circuit 41. The elevator 100 generally also includes a brake 50 for braking the elevator 100. The control device 40 disclosed herein can achieve braking of the elevator 100 by combining the star-locking function with the braking function of the brake 50. Braking refers to the action of stopping or reducing the speed of a running elevator 100.

[0030] The star-locking function is achieved by short-circuiting the three phases of motor 20 to generate an electrical braking force in the opposite direction of elevator 100's movement, thereby braking elevator 100. Brake 50 can be a bidirectional thrust elevator brake. When energized, brake 50 generates bidirectional electromagnetic thrust, disengaging brake 50 from car 30. When de-energized, the electromagnetic force disappears, and under the pressure of an external brake spring, a friction brake is formed for power-off braking. Brake 50 may also include brake pads, which brake elevator 100. Alternatively, elevator 100 may be equipped with a structure for braking brake 50, for example, by applying a holding brake.

[0031] The control device 40 may include a drive controller 42. After the elevator 100 is put into use, the drive controller 42 may determine the moving speed of the car 30 based on the rotational speed of the motor 20, thereby facilitating the subsequent determination of which braking method to use based on the moving speed of the car 30. It will be understood that the moving speed and the rotational speed are positively correlated, that is, the faster the rotational speed of the motor 20, the faster the moving speed of the car 30.

[0032] Step 012: In response to the elevator braking scenario, when the moving speed is less than or equal to the preset star-locking threshold, the star-locking function is turned on to brake the car 30. The star-locking function is configured to be turned on when the three phases of the motor 20 are short-circuited.

[0033] Elevator braking scenarios are numerous, including at least one of: elevator 100 maintenance, elevator 100 normal or faulty stop, and unexpected movement of elevator 100. Elevator 100 may also include a safety circuit 43. This circuit consists of a safety switch installed in each safety component of elevator 100. All safety switches are connected in series to control a safety relay. Only when all safety switches are on will the safety relay energize, allowing elevator 100 to operate. Therefore, elevator braking scenarios may also include disconnection of safety circuit 43, which indicates a fault in elevator 100.

[0034] Prolonged activation of the star-sealing function may cause damage to the components that implement it. For example, a star-sealing contactor is currently commonly used to implement the star-sealing function. If the star-sealing contactor operates for a long time, the temperature of the contactor may become too high, potentially burning the contactor coil. This can cause the contact points to deform due to heat, resulting in insufficient compression and unreliable contact, which in turn increases contact resistance and burns the contacts. Therefore, the star-sealing function should not be activated for extended periods of time. Furthermore, when the car 30 moves at a high speed, the electromotive force generated in the motor 20 will also be high. If braking is performed at a high speed, the motor 20 will need to be powered off, resulting in a large reverse electromotive force within the motor 20. Short-circuiting the three phases of the motor 20 at this time will generate a large inrush current between the motor 20 and the components that implement the star-sealing function, which can adversely affect the motor 20 and the components that implement the star-sealing function. For example, under high current inrush, the motor 20 is prone to demagnetization, which can increase the resistance of the components that implement the star-sealing function. Therefore, the star-locking function can only be activated when the speed of the car 30 is less than or equal to a certain value. Furthermore, the torque generated by the device implementing the star-locking function does not continuously increase with increasing current. Instead, it reaches a maximum star-locking torque at a certain node. Therefore, the drive controller 42 can set the maximum speed corresponding to the maximum star-locking torque as the preset star-locking threshold.

[0035] In the event of an elevator braking scenario, the drive controller 42 determines which braking method to use based on the current speed of the car 30. If the speed is less than or equal to the preset braking threshold, the drive controller 42 short-circuits the three phases of the motor 20 to activate the braking function, generating an electrical braking force in the opposite direction of the car 30's movement to brake the car 30.

[0036] Furthermore, after the star-sealing function is activated, the car 30 will automatically move up or down due to the gravity difference between the car 30 itself and the counterweight. For example, if the car 30 itself is heavier than the counterweight, the car 30 will move downward; if the car 30 itself is lighter than the counterweight, the car 30 will move upward. As the car 30 moves due to gravity, it drives the motor 20 to rotate, generating an electromotive force between the motor 20 and the device that implements the star-sealing function. This allows the device that implements the star-sealing function to generate an electrical braking force in the opposite direction of the car 30's movement. However, when the car 30 stops moving, the motor 20 cannot rotate, and the corresponding electromotive force cannot be generated. At this time, the electrical braking force cannot be generated. After the electrical braking force disappears, the car 30 will continue to move. Therefore, the star-sealing function can only make the car 30 move at a constant speed and cannot stop the car 30 from moving. As the car 30 continues to move, the magnitude of the electric braking force ultimately generated will reach a torque balance with the gravity difference between the car 30 and the counterweight, that is, the magnitude of the electric braking force is equal to the gravity difference between the car 30 and the counterweight, and then the car 30 will continue to move at a constant speed at this time, so that the car 30 can move at a slower speed, making it easier to subsequently use other devices of the elevator 100, such as the brake 50 of the elevator 100, to stop the car 30, thereby ensuring the safety of the car 30 and the passengers.

[0037] The control method of the disclosed embodiment first drives the controller 42 to obtain the moving speed of the car 30 based on the rotational speed of the motor 20. When the elevator 100 needs to be braked and the moving speed of the car 30 is less than or equal to the preset star-locking threshold, the three phases of the motor 20 are short-circuited to activate the star-locking function, thereby generating an electrical braking force to brake the car 30. In this way, the drive controller 42 can use the star-locking function to brake to avoid excessive wear of the brake pads of the brake 50. At the same time, since the star-locking function is not activated until the moving speed is less than or equal to the preset star-locking threshold, this can avoid the long-term operation of the star-locking function, thereby ensuring the normal operation of the devices that implement the star-locking function as much as possible. On the other hand, it can avoid the generation of large inrush currents in the motor 20 and the devices that implement the star-locking function, thereby further ensuring the normal operation of the motor 20 and the devices that implement the star-locking function.

[0038] Referring to FIG. 2 and FIG. 4 , in some embodiments, the elevator 100 further includes a brake 50 , and the control method further includes:

[0039] Step 013: In response to the elevator braking scenario, when the moving speed is greater than the preset star-locking threshold, the brake 50 is controlled to switch to the braking state and the power supply of the motor 20 is disconnected.

[0040] Specifically, referring to FIG3 , the control device 40 may further include a main controller 44, which may control the operating state of the brake 50 and the on / off state of the power supply to the motor 20. In the event of an elevator braking scenario, both the main controller 44 and the drive controller 42 may obtain the moving speed of the car 30 in response to the elevator braking scenario. When the moving speed exceeds a preset star-locking threshold, the drive controller 42 will not activate the star-locking function to avoid generating a large inrush current. In this case, the main controller 44 is required to control the brake 50 to switch to a braking state. For example, the control device 40 may further include a brake control circuit 45. Turning off the brake control circuit 45 may cause the brake 50 to switch to a braking state, thereby braking the elevator 100 through the brake. Simultaneously, the main controller 44 will disconnect the power supply to the motor 20 to cut off the output torque of the motor 20, thereby preventing the motor 20 from continuously driving the car 30. The brake 50 is then used to brake the elevator 100.

[0041] For example, when elevator 100 stops normally or in an emergency, the car 30 typically slows down from its normal operating speed to zero, and the normal operating speed of car 30 is generally greater than a preset star-blocking threshold. Therefore, when elevator 100 needs to stop, control device 40 first controls brake 50, via main controller 44, to switch to a braking state and disconnect power to motor 20. When the braking force of brake 50 exceeds the mass difference between car 30 and the counterweight, the speed of car 30 begins to decrease. While elevator 100 is stopped, control device 40 also obtains the moving speed of car 30 in real time. If the moving speed of car 30 is less than or equal to the preset star-blocking threshold, drive controller 42 short-circuits the three phases of motor 20 to activate the star-blocking function. In particular, the control device 40 may also include a current detection circuit 46. Before short-circuiting the three phases of the motor 20, the current detection circuit 46 can be used to detect whether there is current in the motor 20. The three phases of the motor 20 can only be short-circuited when the power supply of the motor 20 has been disconnected and there is no current in the motor 20. Otherwise, a short circuit problem will occur, which will make the motor 20 and the devices that can realize the star-sealing function easily damaged.

[0042] Furthermore, the main controller 44 can also control the drive controller 42 to operate. Therefore, when the elevator 100 stops, the main controller 44 can also control the drive controller 42 to short-circuit the three phases of the motor 20 to activate the star-sealing function. However, compared with the solution in which the drive controller 42 directly short-circuits the three phases of the motor 20, the solution in which the main controller 44 short-circuits the three phases of the motor 20 by controlling the drive controller 42 is longer. As a result, the time from when the main controller 44 issues a control instruction to when the three phases of the motor 20 are short-circuited is longer than the time from when the drive controller 42 issues a control instruction to when the three phases of the motor 20 are short-circuited. As a result, the control efficiency is also lower. Therefore, in terms of implementation path, directly controlling the short-circuiting of the three phases of the motor 20 through the drive controller 42 is the optimal solution. In this case, the control time is shorter and the control efficiency is also higher.

[0043] In this way, during the stop of the elevator 100, the braking mode of the car 30 can be determined according to the moving speed of the car 30, so as to ensure that the car 30 can complete the stop on the one hand, and on the other hand, avoid the brake 50 and the device that can realize the star-sealing function from working for a long time during the stop process, and avoid the generation of large impact current, thereby ensuring the equipment safety of the brake 50 and the device that can realize the star-sealing function.

[0044] Referring to FIG. 2 and FIG. 5 , in some embodiments, step 012: in response to the elevator braking scenario, when the moving speed is less than or equal to the preset braking threshold, turning on the braking function to brake the car 30 includes:

[0045] Step 0121: In response to the elevator braking scenario, when the moving speed is less than or equal to the preset star-blocking threshold, the brake 50 is controlled to switch to the braking state and the power supply of the motor 20 is disconnected;

[0046] Step 0122: When the brake 50 is in the braking state and the power supply 20 is disconnected, the star-locking function is turned on to brake the car 30.

[0047] Specifically, referring to Figure 3 , in response to an elevator braking scenario, when the moving speed is less than or equal to the preset star-locking threshold, before activating the star-locking function, the main controller 44 can also control the brake 50 to switch to the braking state and disconnect the power supply to the motor 20 to cut off the output torque of the motor 20. If the brake 50 is determined to be in the braking state and the power supply 20 is disconnected, the drive controller 42 can short-circuit the three phases of the motor 20 to activate the star-locking function. In this way, the control device 40 can combine the braking force of the brake 50 with the electrical braking force of the star-locking function to brake the elevator 100, thereby ensuring that the elevator 100 can stop in a timely manner and the personal safety of the passengers.

[0048] For example, when elevator 100 is in a leveling area, it may need to perform a re-leveling function. Due to the influence of the excessive weight of the main traction wire rope and the load of the car 30, it elastically stretches, causing the originally leveled elevator 100 to experience a leveling error. If the weight is too light, the car 30 will rise, and if the weight is too heavy, the car 30 will fall. The re-leveling function is to move the car 30 to the leveling position when the elevator 100 experiences a leveling error. The control device 40 may also include a car accident movement monitoring circuit 47. When the elevator 100 performs the re-leveling function, the movement speed of the car 30 is generally low and is generally less than a preset star-off threshold. If the elevator 100 accidentally moves at this time, the main controller 44 can lock the fault according to the car accident movement monitoring circuit 47. When the car 30 leaves the leveling area, the main controller 44 can issue a closing command and disconnect the brake control circuit 45 to control the brake 50 to switch to the braking state, and at the same time disconnect the power supply of the motor 20. The drive controller 42 short-circuits the three phases of the motor 20 when the power supply of the motor 20 is disconnected to turn on the star-sealing function. Therefore, under the dual effects of the braking torque and the electrical braking torque of the brake 50, the distance of accidental movement of the car 30 is reduced, and the braking performance of the car 30 when an accidental movement failure occurs is improved. At the same time, the wear of the brake 50 is also reduced, and the service life of the brake 50 is improved.

[0049] For another example, when the elevator 100 is undergoing maintenance, for safety reasons, the operating speed of the elevator 100 during maintenance (hereinafter referred to as the maintenance speed) can be set to be less than or equal to the maximum slipping speed of the car 30 when the star-sealing function is turned on. Slipping refers to the phenomenon in which the car 30 (or counterweight) rises or falls due to the potential energy generated by the mass difference between the car 30 and the counterweight when the elevator 100 loses power drive and control. The maximum slipping speed of the car 30 when the star-sealing function is turned on needs to be tested before the elevator 100 is put into use. During the test, the car 30 needs to be loaded at 110%, and then the control brake 50 is switched to the braking state and the power supply of the motor 20 is disconnected. The star-sealing function is turned on at the same time when the power supply of the motor 20 is disconnected. When the lockout function is activated, the resulting electrical braking force will achieve a torque balance with the gravity difference between the car 30 and the counterweight. That is, the electrical braking force will equal the gravity difference between the car 30 and the counterweight. The car 30 will then continue to move at a constant speed at this current speed, which is the maximum slip speed of the car 30 when the lockout function is activated. The preset lockout threshold is the maximum speed corresponding to the maximum lockout torque. Generally, during elevator 100 operation, the reverse torque generated by the lockout function will not reach its maximum value. Therefore, the maximum slip speed is generally less than the preset lockout threshold.

[0050] Since it takes time for the brake 50 to establish braking torque, generally within a time range of 100ms-300ms, if the control device 40 uses the star-sealing circuit 41 to implement the star-sealing function, the electrical braking force can be established in no more than 20ms. Therefore, during maintenance and when the elevator 100 needs to be braked, the main controller 44 can control the brake 50 to switch to the braking state and disconnect the power supply of the motor 20. The drive controller 42 short-circuits the three phases of the motor 20 while the power supply of the motor 20 is disconnected to activate the star-sealing function, thereby reducing the risk of the car 30 losing control during the period when the brake 50 establishes braking torque. At the same time, the relative wear between the brake 50 and the traction sheave of the elevator 100 is also reduced. Therefore, under the dual effects of the braking force of the brake 50 and the electrical braking force, the service life of the brake 50 is improved. In particular, it takes time to build up the braking force, and the braking force is generated gradually. Therefore, before the braking force is built up and in the initial stage of its establishment, the magnitude of the braking force is usually smaller than the gravity difference between the car 30 and the counterweight, so that the car 30 has an acceleration in the same direction as the original moving direction, so that the car 30 will have a certain acceleration stage.

[0051] For another example, if the brake 50 experiences a weakening of the braking torque during braking, such as a single brake arm failure, it will be difficult for the brake 50 to achieve a quick stop. At this point, it is also necessary to obtain the moving speed of the car 30. When the moving speed is less than or equal to the preset locking threshold, the drive controller 42 can activate the locking function and maintain the brake 50 in the braking state, so that the wear of the brake 50 can be reduced under the dual effects of the braking force and electrical braking force of the brake 50. In particular, after the elevator 100 stops, the main controller 44 can determine the braking force capacity of the brake 50 to, on the one hand, avoid safety hazards during the idle period waiting for the next braking force self-monitoring. On the other hand, the main controller 44 can decide whether to lock the fault based on the braking force capacity of the brake 50 to prevent a more serious braking force failure from occurring next time.

[0052] Referring to FIG. 2 , FIG. 3 and FIG. 6 , in some embodiments, the elevator 100 further includes a star-blocking circuit 41 . Step 012 : activating the star-blocking function includes:

[0053] Step 0123 : Control the star-blocking circuit 41 to short-circuit the three phases of the motor 20 .

[0054] Specifically, the elevator 100 can implement a star-locking function based on the star-locking circuit 41. When the elevator 100 needs to be braked and the moving speed is less than or equal to a preset star-locking threshold, the drive controller 42 can control the star-locking circuit 41 to short-circuit the three phases of the motor 20, so that the star-locking circuit 41 generates an electrical braking force, and the electrical braking force is used to brake the elevator 100.

[0055] For example, referring to Figure 3 , when the safety circuit 43 is disconnected, the main controller 44 receives a signal indicating the safety circuit 43 has been disconnected. At this point, the main controller 43 detects the speed of the car 30. If the speed exceeds a preset braking threshold, the main controller 43 disconnects the brake control circuit 45, causing the brake 50 to switch to a braking state and disconnecting the power to the motor 20. This, while simultaneously utilizing the brake 50 to brake the car 30, prevents the motor 20 from further driving the car 30. The main controller 43 then continues to monitor the speed of the car 30 in real time. If the speed is less than or equal to the preset braking threshold, the main controller 43 uses the current detection circuit 46 to confirm whether current is flowing in the motor 20, thereby reconfirming whether the power to the motor 20 has been disconnected. After confirming that the power to the motor 20 has been disconnected, the main controller 43 issues a control instruction to the drive controller 42, causing it to control the braking circuit 41 to short-circuit the three phases of the motor 20, thereby activating the braking function and utilizing the generated electrical braking force to brake the car 30.

[0056] Currently, conventional elevator electronic control designs implement safe torque shutdown and star-off functions using a main contactor between the elevator's inverter and motor, or by designing both a main contactor and a star-off contactor on the inverter input side. However, star-off contactors present numerous limitations during use. Firstly, after prolonged operation, star-off contactors can experience issues such as contact aging, corrosion, oxidation, and noise. Secondly, the numerous coupling factors between the star-off contactor's mechanical response time and the coil characteristics, supply voltage, and surge absorption characteristics result in a long response time, typically between 50ms and 150ms. Inrush current refers to the peak current flowing into the power supply device at the moment power is connected. Therefore, when a dangerous situation occurs, such as during the re-leveling process or the slow running of the maintenance equipment, the brake 50 is stuck, making it impossible for the brake 50 to generate a braking torque. The star-sealing contactor cannot activate the star-sealing function in a short time, which may easily bring safety hazards to the passengers. For example, due to gravity, the elevator 100 may fall rapidly within the response time of the star-sealing contactor, which may easily pose a certain threat to the personal safety of the passengers.

[0057] The star-sealing circuit 41 can, on the one hand, avoid damage and noise problems caused by electric shock to the contactor itself after long-term use. On the other hand, the star-sealing circuit 41 uses an electronic circuit, and its response time does not exceed 20ms, or can be even lower. Therefore, the response time of opening the star-sealing function can be greatly shortened. In the event of a dangerous situation, the star-sealing circuit 41 can quickly short-circuit the three phases of the motor 20 and generate an electrical braking force, thereby improving the safety performance of the elevator 100 and ensuring the personal safety of the passengers as much as possible.

[0058] Please refer to FIG. 2 , FIG. 3 and FIG. 7 . In certain embodiments, when the star-blocking function is enabled, the control method further includes:

[0059] Step 014: Obtain the current and / or temperature of the star sealing circuit 41; and

[0060] Step 015 : When the current is greater than a preset current threshold and / or the temperature is greater than a preset temperature threshold, the star-blocking circuit 41 is controlled to disconnect the three phases of the motor 20 .

[0061] Specifically, the flowing current may cause the star-sealing circuit 41 to heat up. When the temperature within the star-sealing circuit 41 is too high, it can easily damage the star-sealing circuit 41. Therefore, the drive controller 42 can determine whether the star-sealing circuit 41 can continue to operate based on the current, temperature, or both of the current and temperature of the star-sealing circuit 41. First, based on the temperature of the star-sealing circuit 41 and the operating conditions of its internal components, the maximum temperature at which the star-sealing circuit 41 can continue to operate can be determined, and this temperature can be determined as the preset temperature threshold. A preset current threshold can also be set. For example, the star-sealing circuit 41 can be installed in an inverter, and the rated current can be set based on the inverter's frequency conversion capability, with 1.5 times the rated current set as the preset current threshold.

[0062] In one embodiment, the drive controller 42 determines whether the star-sealing circuit 41 can continue to operate based on the current of the star-sealing circuit 41. Specifically, when the star-sealing function is enabled, the drive controller 42 can obtain the current of the star-sealing circuit 41 in real time and compare the obtained current with a preset current threshold. If the current exceeds the preset current threshold, the drive controller 42 controls the star-sealing circuit 41 to disconnect the three phases of the motor 20.

[0063] In another embodiment, the drive controller 42 determines whether the star-sealing circuit 41 can continue to operate based on the temperature of the star-sealing circuit 41. Specifically, when the star-sealing function is enabled, the drive controller 42 can obtain the temperature of the star-sealing circuit 41 in real time and compare the obtained temperature with a preset temperature threshold. If the temperature exceeds the preset temperature threshold, the drive controller 42 controls the star-sealing circuit 41 to disconnect the three phases of the motor 20.

[0064] In yet another embodiment, the drive controller 42 determines whether the star-sealing circuit 41 can continue to operate based on the current and temperature of the star-sealing circuit 41. Specifically, when the star-sealing function is enabled, the drive controller 42 can obtain the temperature and current of the star-sealing circuit 41 in real time, compare the real-time temperature with a preset temperature threshold, and compare the real-time current with a preset current threshold. If the temperature exceeds the preset temperature threshold and the current exceeds the preset current threshold, the drive controller 42 controls the star-sealing circuit 41 to disconnect the three phases of the motor 20.

[0065] The drive controller 42 can make a judgment based on the current or temperature at a certain moment. When the current at a certain moment is greater than a preset current threshold or the temperature is higher than a preset temperature threshold, the drive controller 42 can immediately control the star-sealing circuit 41 to disconnect the three phases of the motor 20. Alternatively, the drive controller 42 can also make a judgment based on the duration that the current or temperature exceeds the corresponding threshold. For example, if the current is greater than a preset current threshold or the temperature is higher than a preset temperature threshold, and the duration of exceeding the corresponding threshold is greater than or equal to a predetermined time, the drive controller 42 will control the star-sealing circuit 41 to disconnect the three phases of the motor 20.

[0066] In this way, the drive controller 42 can monitor the current and temperature of the star-sealing circuit 41 in real time. When the current and / or temperature exceed the corresponding threshold value, the drive controller 42 can promptly control the star-sealing circuit 41 to disconnect the three-phase connection with the motor 20 to avoid the star-sealing circuit 41 from accumulating excessive heat energy, thereby ensuring the safety of the star-sealing circuit 41.

[0067] Referring to FIG. 2 and FIG. 8 , in some embodiments, the elevator 100 further includes an encoder 60 , which is configured to collect the rotational speed of the motor 20 . The control method further includes:

[0068] Step 016: When the encoder 60 fails, the star-locking function is turned on to brake the car 30.

[0069] Specifically, please refer to Figure 3. The encoder 60 of the elevator 100 can be used to collect the rotational speed of the motor 20. The drive controller 42 and the main controller 44 can obtain the moving speed of the car 30 based on the rotational speed of the motor 20 collected by the encoder 60, thereby determining the braking method of the elevator 100 in a targeted manner.

[0070] If the encoder 60 fails, the main controller 44 and the drive controller 42 will be unable to obtain the moving speed of the car 30. To ensure the safety of the car 30, the lockout function can be immediately activated to reduce the moving speed of the car 30, causing the car 30 to coast at a slower speed. Similarly, before activating the lockout function, the main controller 44 can also control the brake 50 to switch to a braking state and disconnect the power supply to the motor 20. Then, while disconnecting the motor 20, the lockout function is activated, allowing the elevator 100 to brake under the dual action of the brake 50 and the electrical braking force, further ensuring the personal safety of the passengers.

[0071] Referring to FIG. 2 and FIG. 9 , in certain embodiments, the control method further includes:

[0072] Step 017: Control the elevator 100 to operate according to a preset working condition at a preset time interval, so as to determine the actual parameters for completing the braking of the star-locking function according to the operation information of the elevator 100, where the operation information at least includes the moving speed;

[0073] Step 018: When the difference between the actual parameter and the preset safety threshold is less than the preset difference threshold, a safety prompt is issued.

[0074] Specifically, referring to Figure 3 , after elevator 100 has operated for a period of time, component aging is inevitable. Therefore, at predetermined intervals, such as every 24 hours, main controller 44 controls elevator 100 to operate according to a predetermined operating condition, where the predetermined operating condition may be elevator 100 at 110% load or no load. It also controls brake 50 to switch to a braking state, disconnects motor 20 from power, and activates the star-locking function. Based on the operating information of elevator 100, actual parameters required for the star-locking function to complete braking are determined, where this operating information includes at least the moving speed. The actual parameters are then compared with a predetermined safety threshold. If the difference between the actual parameters and the predetermined safety threshold is less than the predetermined difference threshold, a safety alert is issued to allow maintenance personnel to promptly repair elevator 100 and ensure the stability of the electrical braking performance, thereby preventing elevator 100 from operating at low performance and posing a safety hazard to elevator 100 and passengers.

[0075] In one embodiment, the actual parameters may be the current of the star-sealing circuit 41 and the star-sealing slip speed. When the control brake 50 is switched to the braking state, the power supply of the motor 20 is disconnected, and the star-sealing function is turned on, the electrical braking force generated by the star-sealing circuit 41 and the mass difference between the elevator 100 and the counterweight will always reach a torque balance, so that the elevator 100 moves at the star-sealing slip speed after the torque balance. However, the star-sealing slip speed cannot be too high. An excessively high star-sealing slip speed will bring certain safety hazards to the elevator 100 and the passengers. Therefore, a preset safety threshold value can be set according to the star-sealing slip speed, for example, 3m / s. Similarly, the current corresponding to the safe movement of the elevator 100 when the star-sealing function is activated can be set as the preset safety threshold value of the current of the star-sealing circuit 41.

[0076] When elevator 100 begins operation, the elevator's 100 star-closing slip speed and the current in star-closing circuit 41 are guaranteed to be less than the corresponding preset safety thresholds. As elevator 100 components age, these speeds and the current in star-closing circuit 41 may gradually increase, gradually approaching the preset safety thresholds. If the difference between the actual parameters and the preset safety thresholds is less than the preset difference threshold, it can be determined that the elevator's 100 performance has deteriorated, and continued operation of elevator 100 could pose a safety hazard to the elevator 100 and passengers. Therefore, the main controller 44 will issue a safety warning.

[0077] For example, the safety threshold for the closing star sliding speed is 3 m / s, and the preset difference threshold is 0.3 m / s. When the elevator 100 is first put into use, the closing star sliding speed of the elevator 100 is relatively low, perhaps 2.3 m / s. As the elevator 100 is used, the closing star sliding speed may increase, for example, to 2.5 m / s, 2.6 m / s. When the closing star sliding speed reaches 2.7 m / s, the main controller 44 will issue a safety prompt.

[0078] Please refer to Figures 1 to 3 again. The control device 40 of the embodiment of the present disclosure can be applied to the elevator 100. The elevator 100 includes a motor 20 and a car 30. The motor 20 and the car 30 are connected. The control device 40 includes a drive controller 42. The drive controller 42 is used to obtain the moving speed of the car 30, and the moving speed is positively correlated with the rotational speed of the motor 20; and in response to the elevator braking scenario, when the moving speed is less than or equal to the preset star-locking threshold, the star-locking function is turned on to brake the car 30. The star-locking function is configured to be turned on when the three phases of the motor 20 are short-circuited.

[0079] The control device 40 of the disclosed embodiment first obtains the moving speed of the car 30 based on the rotational speed of the motor 20. When the elevator 100 needs to be braked and the moving speed of the car 30 is less than or equal to the preset braking threshold, the three phases of the motor 20 are short-circuited to activate the braking function, generating an electrical braking force to brake the car 30. In this way, the braking function can be used to prevent excessive wear of the brake pads of the brake 50. At the same time, because the braking function is not activated until the moving speed is less than or equal to the preset braking threshold, this can avoid the long-term operation of the braking function, thereby ensuring the normal operation of the devices that implement the braking function. It can also avoid the generation of large inrush currents in the motor 20 and the devices that implement the braking function, thereby further ensuring the normal operation of the motor 20 and the devices that implement the braking function.

[0080] Referring again to Figures 1 to 3, an elevator 100 according to an embodiment of the present disclosure includes a motor 20, a car 30, and a control device 40 as described in any of the above embodiments. The motor 20 is connected to the car 30. The control device 40 includes a drive controller 42, which is configured to obtain the moving speed of the car 30, which is positively correlated with the rotational speed of the motor 20; and, in response to an elevator braking scenario, activate a star-locking function to brake the car 30 when the moving speed is less than or equal to a preset star-locking threshold. The star-locking function is configured to activate when the three phases of the motor 20 are short-circuited.

[0081] The elevator 100 of the disclosed embodiment is provided with a control device 40. The control device 40 first obtains the moving speed of the car 30 based on the rotational speed of the motor 20. When the elevator 100 needs to be braked and the moving speed of the car 30 is less than or equal to a preset braking threshold, the three phases of the motor 20 are short-circuited to activate the braking function, thereby generating an electrical braking force to brake the car 30. In this way, the braking function can be used for braking to avoid excessive wear of the brake pads of the brake 50. At the same time, because the braking function is not activated until the moving speed is less than or equal to the preset braking threshold, this can avoid the long-term operation of the braking function, thereby ensuring the normal operation of the devices that implement the braking function as much as possible. On the other hand, it can avoid the generation of large inrush currents in the motor 20 and the devices that implement the braking function, thereby further ensuring the normal operation of the motor 20 and the devices that implement the braking function.

[0082] Please refer to Figure 10. The embodiment of the present disclosure also provides a non-volatile computer-readable storage medium 200, on which a computer program 210 is stored. When the computer program 210 is executed by the processor 220, the steps of the control method of any of the above embodiments are implemented. For the sake of brevity, they are not repeated here.

[0083] Please refer to Figure 11. The embodiment of the present disclosure further provides a computer program product 300, which includes a computer program 310. When the computer program 310 is executed by the processor 320, it implements the control method of any of the above embodiments. For the sake of brevity, it is not repeated here.

[0084] In the description of this specification, the descriptions with reference to the terms "certain embodiments", "in an example", "exemplarily", etc., mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are mutually inconsistent.

[0085] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes additional implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0086] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and are not to be construed as limitations on the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A method for controlling an elevator, wherein: The elevator comprises a motor and a car, the motor and the car are connected, and the method comprises: Acquire the moving speed of the car, where the moving speed is positively correlated with the rotation speed of the motor; and In response to the elevator braking scenario, when the moving speed is less than or equal to a preset star-locking threshold, the star-locking function is turned on to brake the car, and the star-locking function is configured to be turned on when the three phases of the motor are short-circuited.

2. The control method according to claim 1, wherein: The elevator further comprises a brake, and the method further comprises: In response to the elevator braking scenario, when the moving speed is greater than a preset star-locking threshold, the brake is controlled to switch to a braking state and the power supply of the motor is disconnected.

3. The control method according to claim 1, wherein: In response to the elevator braking scenario, when the moving speed is less than or equal to a preset star-locking threshold, turning on the star-locking function to brake the car includes: In response to the elevator braking scenario, when the moving speed is less than or equal to the preset star-locking threshold, the brake is controlled to switch to a braking state and the power supply of the motor is disconnected; When the brake is in a braking state and the power supply is disconnected, the star-locking function is turned on to brake the car.

4. The control method according to any one of claims 1 to 3, wherein: The elevator further includes a safety circuit, and the elevator braking scenario includes at least one of disconnection of the safety circuit, elevator maintenance, normal or faulty elevator stop, and unexpected movement of the elevator.

5. The control method according to claim 1, wherein: The elevator also includes a star-sealing circuit, and the star-sealing function includes: The star-sealing circuit is controlled to short-circuit the three phases of the motor.

6. The control method according to claim 1, wherein: The elevator further includes a star-sealing circuit. When the star-sealing function is turned on, the method further includes: Obtaining the current and / or temperature of the star sealing circuit; and When the current is greater than a preset current threshold and / or the temperature is greater than a preset temperature threshold, the star-blocking circuit is controlled to disconnect the three phases of the motor.

7. The control method according to claim 1, wherein: The elevator further includes an encoder, and the encoder is configured to collect the rotation speed of the motor. The method further includes: In the event of a failure of the encoder, the star-locking function is activated to brake the car.

8. The control method according to claim 1, wherein: Also includes: The elevator is controlled to operate according to a preset working condition at a preset time interval, so as to determine the The actual parameters of the braking completed by the star-locking function, the operation information at least includes the moving speed; When the difference between the actual parameter and the preset safety threshold is smaller than the preset difference threshold, a safety prompt is issued.

9. An elevator control device, wherein: The elevator comprises a motor and a car, the motor is connected to the car, and the control device comprises: A drive controller, the drive controller is used to obtain the moving speed of the car, the moving speed is positively correlated with the rotational speed of the motor; and in response to the elevator braking scenario, when the moving speed is less than or equal to a preset star-locking threshold, turn on the star-locking function to brake the car, and the star-locking function is configured to be turned on when the three phases of the motor are short-circuited.

10. The control device according to claim 9, wherein: The elevator also includes a brake, and the control device also includes a main controller. The main controller is used to control the brake to switch to a braking state and disconnect the power supply of the motor in response to the elevator braking scenario when the moving speed is greater than a preset star-locking threshold.

11. The control device according to claim 9, wherein: The control device also includes a main controller, which is used to respond to the elevator braking scenario and, when the moving speed is less than or equal to a preset star-locking threshold, control the brake to switch to a braking state and disconnect the power supply of the motor; the drive controller is also used to turn on the star-locking function to brake the car when the brake is in a braking state and the power supply is disconnected.

12. The control device according to any one of claims 9 to 11, wherein: The control device also includes a safety circuit, and the elevator braking scenario includes at least one of disconnection of the safety circuit, elevator maintenance, normal or faulty elevator shutdown, and unexpected elevator movement.

13. The control device according to claim 9, wherein: The control device also includes a star-sealing circuit, and the drive controller is further used to control the star-sealing circuit to short-circuit the three phases of the motor.

14. The control device according to claim 9, wherein: The control device also includes a star-sealing circuit, and the drive controller is also used to obtain the current and / or temperature of the star-sealing circuit; and when the current is greater than a preset current threshold and / or the temperature is greater than a preset temperature threshold, control the star-sealing circuit to disconnect from the three phases of the motor.

15. The control device according to claim 9, wherein: The elevator further includes an encoder, which is configured to collect the rotation speed of the motor. The drive controller is also used to activate the star-locking function to brake the car when the encoder fails.

16. The control device according to claim 9, wherein: The control device also includes a main controller, which is further used to control the elevator to operate according to a preset working condition at preset time intervals, so as to determine the actual parameters of the star-sealing function to complete the braking according to the operation information of the elevator, and the operation information at least includes the moving speed; when the difference between the actual parameter and the preset safety threshold is less than the preset difference threshold, a safety prompt is issued.

17. An elevator, wherein: include: Motor; A car, the motor is connected to the car; and A control device as claimed in any one of claims 9 to 16.

18. A non-volatile computer-readable storage medium containing a computer program, wherein when the computer program is executed by a processor, the processor executes the control method according to any one of claims 1 to 8.

19. A computer program product comprising a computer program, wherein: When the computer program is executed by a processor, the control method according to any one of claims 1 to 8 is implemented.

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