An elevator star-sealing loop control system and method

Abstract

The application discloses an elevator star braking circuit control system and method, and the system comprises: an adjustable resistance module, a permanent magnet synchronous motor is connected with the adjustable resistance module and a frequency converter through three-phase windings in sequence, and a normally closed contact of a star braking contactor is connected between the adjustable resistance module and the frequency converter; a microcomputer module is connected with the adjustable resistance module, and is used for obtaining and confirming the running direction and the distance to be coasted of an elevator car according to the real-time position of the elevator car and the weight difference of counterweights when the elevator is braked and coasted; the resistance value of the adjustable resistance module is adjusted according to the distance to be coasted, so that the preset maximum elevator coasting speed is reached; when it is detected that the elevator car approaches the door area range, the resistance value of the adjustable resistance module is adjusted, the elevator coasting speed is reduced, and the elevator is leveled; and the microcomputer module is also connected with the permanent magnet synchronous motor and the frequency converter respectively. The application can improve the elevator coasting speed during elevator emergency rescue, and realizes fast rescue.

Description

Technical Field

[0001] This invention belongs to the field of elevator control technology, specifically relating to an elevator star-loop control system and method. Background Technology

[0002] Currently, in machine-room-less elevators, emergency brake release and runaway operation maintains a low, constant speed by utilizing the weight difference between the elevator car and counterweight, as well as the star-sealing contactor in the star-sealing circuit. When the elevator stops abnormally, rescuers must observe the elevator car door zone signals to stop the car at the door zone before manually opening the doors to allow passengers to exit. This process is time-consuming when the elevator floor spacing is large, leading to prolonged waiting times and potential panic among passengers. Furthermore, relying on signal observation to determine door zone location can be inaccurate, compromising rescue safety. Additionally, the star-sealing contactor's operation, while maintaining low-speed runaway, causes significant acceleration and deceleration fluctuations in the elevator car, potentially panicking passengers and damaging the elevator's mechanical system. Summary of the Invention

[0003] To overcome the above-mentioned technical defects, the present invention provides an elevator star-loop control system and method, which can increase the elevator slip speed during emergency rescue and achieve rapid rescue.

[0004] To address the aforementioned problems, the first aspect of the present invention provides an elevator star-sealing circuit control system, comprising:

[0005] An adjustable resistor module is provided. The permanent magnet synchronous motor is connected to the adjustable resistor module and the frequency converter in sequence through the leads of the three-phase winding. The normally closed contact of the star contactor is connected between the adjustable resistor module and the frequency converter.

[0006] A microcomputer module, connected to the adjustable resistor module, is used to obtain and determine the elevator car's running direction and the distance to be traveled based on the real-time position of the elevator car and the weight difference of the counterweight when the elevator releases the brake and begins to run; adjust the resistance value of the adjustable resistor module according to the distance to be traveled to achieve the preset maximum elevator running speed; when the elevator car is detected to be approaching the door zone, adjust the resistance value of the adjustable resistor module to reduce the elevator running speed and perform elevator leveling.

[0007] The microcomputer module is also connected to the permanent magnet synchronous motor and the frequency converter.

[0008] Furthermore, it also includes a backup power supply and a backup power supply automatic transfer switch. One end of the backup power supply is connected to the backup power supply automatic transfer switch, and the other end is connected to the microcomputer module. When the elevator power supply circuit stops working, the backup power supply automatic transfer switch automatically closes and automatically starts the backup power supply.

[0009] Furthermore, it also includes a brake circuit, which includes a runaway switch and a motor brake coil, and the backup power supply is connected to the motor brake coil through the runaway switch.

[0010] Furthermore, it also includes a backup power indicator light, which is connected between the backup power supply and the microcomputer module to indicate the working status of the backup power supply.

[0011] A second aspect of the present invention also provides an elevator star-loop control method, applied to the above-mentioned elevator star-loop control system, comprising the following steps:

[0012] When the elevator releases the brake and begins to slip, the direction of travel and the distance to be slipped are determined based on the real-time position of the elevator car and the weight difference of the counterweight.

[0013] Adjust the resistance value of the adjustable resistor according to the distance to be traveled, so that the elevator car speed reaches the preset maximum elevator car speed.

[0014] When the elevator car is detected approaching the door zone, the resistance value of the adjustable resistor is adjusted to reduce the elevator speed and level the elevator.

[0015] Furthermore, when the elevator releases the brakes and begins to roll, the following steps are taken: obtaining and determining the elevator car's running direction and the distance to be rolled based on the real-time position of the elevator car and the weight difference of the counterweight.

[0016] When the elevator releases the brakes and begins to run, the real-time position of the elevator car and the weight difference of the counterweight are obtained.

[0017] The direction of travel of the elevator car is determined based on the real-time position of the elevator car and the weight difference of the counterweight.

[0018] Based on the real-time position and direction of travel of the elevator car, the distance to the nearest elevator door zone is determined, and the waiting distance of the elevator car is obtained.

[0019] Furthermore, the step involves adjusting the resistance value of the adjustable resistor according to the distance to be traveled, so that the elevator car speed reaches the preset maximum elevator car speed, including the following steps:

[0020] Based on the distance to be traveled, the resistance value of the adjustable resistor is adjusted to control the reduction of the short-circuit current in the sealing circuit, so that the elevator travel speed reaches the preset maximum elevator travel speed.

[0021] Furthermore, before obtaining and confirming the elevator car's running direction and the distance to be traveled based on the real-time position of the elevator car and the weight difference of the counterweight when the elevator releases the brakes and begins to slip, the following steps are included:

[0022] Check if the elevator power supply circuit is working properly. If the elevator power supply circuit stops working, start the backup power supply.

[0023] Confirm that the elevator car doors and landing doors on each floor are closed properly.

[0024] Upon receiving the start signal from the elevator trolley switch, the elevator releases the brakes and begins to run.

[0025] Furthermore, the procedure involves checking whether the elevator power supply circuit is working properly. If the elevator power supply circuit stops working, before starting the backup power supply, the following steps are included:

[0026] When the elevator stops working abnormally, check whether the real-time position of the elevator car is within the elevator door zone.

[0027] If the elevator car's real-time position is outside the elevator door zone, check if the elevator power supply circuit is working properly.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] This invention discloses an elevator star-sealing circuit control system and method. An adjustable resistor module is connected in series in the star-sealing circuit. When the elevator releases the brake and begins to run, a microcomputer module obtains and determines the elevator car's running direction and the distance to be run based on the real-time position of the elevator car and the weight difference of the counterweight. The microcomputer module adjusts the resistance value of the adjustable resistor module according to the distance to be run, thereby reducing the short-circuit current in the star-sealing circuit and reducing the resistance on the rotor of the permanent magnet synchronous motor. This allows the elevator car's running speed to increase to a preset maximum running speed, thus improving the elevator's running speed. When the elevator car is detected approaching the door zone, the resistance value of the adjustable resistor module is adjusted to reduce the elevator's running speed, enabling leveling. By adjusting the resistance value of the adjustable resistor module in real time to change the running speed during emergency brake release, the running speed during emergency rescue is increased, enabling rapid rescue. Simultaneously, it reduces the psychological impact on passengers waiting to be rescued inside the elevator car and avoids damage to the elevator's mechanical system. Attached Figure Description

[0030] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0031] Figure 1 This is a connection diagram of the elevator star-shaped circuit control system described in Example 1. Figure 1 ;

[0032] Figure 2 This is a connection diagram of the elevator star-shaped circuit control system described in Example 1. Figure 2 ;

[0033] Figure 3 This is a flowchart of the elevator star-loop control method described in Example 2;

[0034] Labeling Explanation: 1. Adjustable Resistor Module; 2. Microcomputer Module; 3. Permanent Magnet Synchronous Motor; 4. Frequency Converter; 5. Sealed Star Contactor; 6. Backup Power Supply; 7. Backup Power Supply Automatic Transfer Switch; 8. Tramway Switch; 91. Left Brake Coil of Motor; 92. Right Brake Coil of Motor; 10. Backup Power Supply Indicator Light. Detailed Implementation

[0035] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0036] Example 1

[0037] like Figure 1 and Figure 2 This embodiment discloses an elevator star-sealing circuit control system, including an adjustable resistor module 1 and a microcomputer module 2. A permanent magnet synchronous motor 3 is connected to the adjustable resistor module 1 and a frequency converter 4 in sequence through the leads of its three-phase windings. The normally closed contact of the star-sealing contactor 5 is connected between the adjustable resistor module 1 and the frequency converter 4. The microcomputer module 2 is connected to the adjustable resistor module 1 and is used to obtain and determine the running direction and the distance to be slid of the elevator car based on the real-time position of the elevator car and the weight difference of the counterweight when the operator manually releases the elevator brake to perform a sliding operation. Based on the distance to be slid, the resistance value of the adjustable resistor module is adjusted to achieve the preset maximum elevator sliding speed. When the elevator car is detected to be approaching the door zone, the resistance value of the adjustable resistor module is adjusted to reduce the elevator sliding speed and perform elevator leveling. The microcomputer module is also connected to the permanent magnet synchronous motor and the frequency converter.

[0038] Specifically, it also includes a backup power supply 6 and a backup power supply automatic transfer switch 7. One end of the backup power supply 6 is connected to the backup power supply automatic transfer switch 7, and the other end is connected to the microcomputer module 2. When the elevator power supply circuit stops working, the backup power supply automatic transfer switch 7 automatically closes and automatically starts the backup power supply 6.

[0039] Specifically, it also includes a brake circuit, which includes a runaway switch 8 and a motor brake coil. The backup power supply 6 is connected to the motor brake coil through the runaway switch 8.

[0040] In one embodiment, the motor brake coil includes a left motor brake coil 91 and a right motor brake coil 92.

[0041] Specifically, it also includes a backup power indicator light 10, which is connected between the backup power supply 6 and the microcomputer module 2 to indicate the working status of the backup power supply 6.

[0042] The permanent magnet synchronous motor 3 is connected to the adjustable resistor module 1 and the frequency converter 4 in sequence through the leads of its three-phase windings. The normally closed contact of the star-sealed contactor 5 is connected between the adjustable resistor module 1 and the frequency converter 4. The microcomputer module 2 is connected to the adjustable resistor module 1, the permanent magnet synchronous motor 3, and the frequency converter 4. When the elevator stops running (including stops during normal operation, stops due to elevator malfunction, and stops due to power outages), the permanent magnet synchronous motor 3 stops working, and the three-phase windings of the permanent magnet synchronous motor 3 activate the star-sealed protection to prevent high-speed runaway due to brake failure. If the three-phase windings of the permanent magnet synchronous motor 3 activate the star-sealed protection, and the elevator runs away due to brake failure, the star-sealed circuit short-circuits, resulting in a large short-circuit current. This causes a large resistance on the rotor of the permanent magnet synchronous motor 3, which acts as a brake on the elevator runaway, making the elevator run slowly.

[0043] This invention adds an adjustable resistor module 1 between the normally closed contacts of the permanent magnet synchronous motor 3 and the sealing contactor 5. The microcomputer module 2 adjusts the resistance value of the adjustable resistor module 1, reducing the short-circuit current and the resistance on the rotor of the permanent magnet synchronous motor 3, thereby increasing the elevator's trolley speed. When the elevator's trolley speed reaches the preset maximum trolley speed, the microcomputer module 2 stops adjusting the adjustable resistor module, and the elevator continues to trolley at the current speed. When the microcomputer module 2 detects that the elevator is about to reach the nearest door zone, it adjusts the resistance value of the adjustable resistor module 1, increasing the short-circuit current and the resistance on the rotor of the permanent magnet synchronous motor 3, thereby reducing the elevator's trolley speed and leveling the elevator.

[0044] When the elevator power supply circuit stops working, the backup power transfer switch automatically closes, automatically starting the backup power supply. The trolley switch closes, the backup power indicator light illuminates, and the backup power supply supplies power to the microcomputer module and the motor brake coil. With the motor brake coil energized, the elevator releases the brake and begins to move. The microcomputer module adjusts the adjustable resistor module to regulate the elevator's trolley speed; the specific operation and principle are the same as described above and will not be repeated here.

[0045] Example 2

[0046] like Figure 3 This embodiment discloses an elevator star-loop control method, applied to the elevator star-loop control system described in Embodiment 1, comprising the following steps:

[0047] S1. When the elevator releases the brake and begins to slip, obtain and determine the direction of travel and the distance to be slipped of the elevator car based on the real-time position of the elevator car and the weight difference of the counterweight.

[0048] Specifically, step S1 includes the following steps:

[0049] When the elevator releases the brakes and begins to run, the real-time position of the elevator car and the weight difference of the counterweight are obtained.

[0050] The direction of travel of the elevator car is determined by the real-time position of the elevator car and the weight difference of the counterweight.

[0051] Based on the real-time position and direction of travel of the elevator car, the distance to the nearest elevator door zone is determined, and the waiting distance of the elevator car is obtained.

[0052] S2. Based on the desired gliding distance, adjust the resistance value of the adjustable resistor module to reduce the short-circuit current in the star-sealing circuit, thereby increasing the elevator gliding speed to the preset maximum gliding speed. By adjusting the resistance value of the adjustable resistor module, the short-circuit current in the star-sealing circuit decreases, reducing the resistance on the rotor of the permanent magnet synchronous motor and increasing the elevator gliding speed. When the elevator gliding speed reaches the preset maximum gliding speed, stop adjusting the resistance value of the adjustable resistor module, and the elevator continues gliding at the current speed.

[0053] S3. When the elevator car is detected to be approaching the door zone, the resistance value of the adjustable resistor module is adjusted to increase the short-circuit current, which increases the resistance on the rotor of the permanent magnet synchronous motor, reduces the elevator speed, and performs elevator leveling.

[0054] In one embodiment, the following steps are included before step S1:

[0055] Check if the elevator power supply circuit is working properly. If the elevator power supply circuit stops working, start the backup power supply. The backup power supply supplies power to the microcomputer module and the motor brake coil.

[0056] Confirm that the elevator car doors and the hall doors on each floor are closed properly.

[0057] If the elevator car door and each floor hall door are closed normally, and the elevator receives the start signal from the elevator trolley switch, the elevator will release the brake and trolley.

[0058] In one embodiment, the following steps are included before step S1:

[0059] When the elevator stops working abnormally, check if the elevator car's real-time position is within the elevator door zone. If the elevator car's real-time position is within the elevator door zone, the staff should disconnect the elevator power switch and use a triangular key to open the door for rescue.

[0060] If the elevator car's real-time position is outside the elevator door zone, check if the elevator power supply circuit is working properly.

[0061] This invention adds an adjustable resistor module between the normally closed contacts of the permanent magnet synchronous motor and the star-sealed contactor. Based on the real-time position of the elevator car and the weight difference of the counterweight, the operating direction and the distance to be slid of the elevator car are determined. The resistance value of the adjustable resistor module is adjusted in real time according to the operating direction and the distance to be slid, thereby realizing the regulation and control of the elevator car speed and improving the sliding speed of the elevator in emergency rescue. On the other hand, the microcomputer module determines the distance to the nearest elevator door area based on the real-time position and operating direction of the elevator car. By adjusting and controlling the elevator car speed, the elevator can quickly and smoothly reach the nearest elevator door area, realizing rapid rescue and avoiding the psychological impact on passengers waiting to be rescued due to being trapped in the elevator car for a long time, as well as avoiding damage to the elevator mechanical system.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An elevator star-loop control system, characterized in that, include: An adjustable resistor module is provided. The permanent magnet synchronous motor is connected to the adjustable resistor module and the frequency converter in sequence through the leads of the three-phase winding. The normally closed contact of the star contactor is connected between the adjustable resistor module and the frequency converter. A microcomputer module, connected to the adjustable resistor module, is used to obtain and determine the elevator car's running direction and the distance to be traveled based on the real-time position of the elevator car and the weight difference of the counterweight when the elevator releases the brake and begins to run. Based on the distance to be traveled, the resistance value of the adjustable resistor module is adjusted to control the short-circuit current in the star-sealing circuit, thereby reducing the elevator's running speed to the preset maximum speed. When the elevator car is detected approaching the door zone, the resistance value of the adjustable resistor module is adjusted to control the short-circuit current in the star-sealing circuit, thereby reducing the elevator's running speed and performing elevator leveling. The microcomputer module is also connected to the permanent magnet synchronous motor and the frequency converter.

2. The elevator star-loop control system according to claim 1, characterized in that, It also includes a backup power supply and a backup power supply automatic transfer switch. One end of the backup power supply is connected to the backup power supply automatic transfer switch, and the other end is connected to the microcomputer module. When the elevator power supply circuit stops working, the backup power supply automatic transfer switch automatically closes and automatically starts the backup power supply.

3. The elevator star-loop control system according to claim 2, characterized in that, It also includes a brake circuit, which includes a runaway switch and a motor brake coil, and the backup power supply is connected to the motor brake coil through the runaway switch.

4. The elevator star-shaped circuit control system according to claim 2, characterized in that, It also includes a backup power indicator light, which is connected between the backup power supply and the microcomputer module to indicate the working status of the backup power supply.

5. A method for controlling an elevator star-loop circuit, applied to the elevator star-loop control system according to any one of claims 1-4, characterized in that, Includes the following steps: When the elevator releases the brake and begins to slip, the direction of travel and the distance to be slipped are determined based on the real-time position of the elevator car and the weight difference of the counterweight. Adjust the resistance value of the adjustable resistor according to the distance to be traveled, so that the elevator car speed reaches the preset maximum elevator car speed. When the elevator car is detected approaching the door zone, the resistance value of the adjustable resistor is adjusted to reduce the elevator speed and level the elevator.

6. The elevator star-loop control method according to claim 5, characterized in that, When the elevator releases the brakes and begins to roll, the following steps are taken to obtain and determine the direction of travel and the distance to be rolled away from the elevator car based on the real-time position of the elevator car and the weight difference of the counterweight: When the elevator releases the brakes and begins to run, the real-time position of the elevator car and the weight difference of the counterweight are obtained. The direction of travel of the elevator car is determined based on the real-time position of the elevator car and the weight difference of the counterweight. Based on the real-time position and direction of travel of the elevator car, the distance to the nearest elevator door zone is determined, and the waiting distance of the elevator car is obtained.

7. The elevator star-loop control method according to claim 5, characterized in that, The steps involve adjusting the resistance value of the adjustable resistor according to the desired gliding distance to achieve the preset maximum gliding speed of the elevator car, including the following steps: Based on the distance to be traveled, the resistance value of the adjustable resistor is adjusted to control the reduction of the short-circuit current in the sealing circuit, so that the elevator travel speed reaches the preset maximum elevator travel speed.

8. The elevator star-loop control method according to claim 5, characterized in that, Before the elevator car starts to roll away when the brakes are released, and before determining the direction of travel and the distance to be rolled away based on the real-time position of the elevator car and the weight difference of the counterweight, the following steps are included: Check if the elevator power supply circuit is working properly. If the elevator power supply circuit stops working, start the backup power supply. Confirm that the elevator car doors and landing doors on each floor are closed properly. Upon receiving the start signal from the elevator trolley switch, the elevator releases the brakes and begins to run.

9. The elevator star-loop control method according to claim 8, characterized in that, The steps for checking whether the elevator power supply circuit is working properly include the following: If the elevator power supply circuit stops working, before starting the backup power supply, the steps are as follows: When the elevator stops working abnormally, check whether the real-time position of the elevator car is within the elevator door zone. If the elevator car's real-time position is outside the elevator door zone, check if the elevator power supply circuit is working properly.

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