Elevator star sealing loop control system and method

Abstract

The invention discloses an elevator star-sealing loop control system and method, and the system comprises an adjustable resistor module, a permanent magnet synchronous motor is sequentially connected with the adjustable resistor module and a frequency converter through a lead of a three-phase winding, and a normally-closed contact of a star-sealing contactor is connected between the adjustable resistor module and the frequency converter; the microcomputer module is connected with the adjustable resistor module and is used for obtaining the real-time position of the elevator car and the weight difference of the counterweight and confirming the running direction and the to-be-slipped distance of the elevator car according to the real-time position of the elevator car and the weight difference of the counterweight when the elevator loosens the brake and slips; according to the to-be-slipped distance, the resistance value of the adjustable resistance module is adjusted, and the preset maximum elevator sliding speed is achieved; when it is detected that the elevator car is close to the door area range, the resistance value of the adjustable resistance module is adjusted, the elevator car sliding speed is reduced, and elevator leveling is conducted; the microcomputer module is further connected with the permanent magnet synchronous motor and the frequency converter. The sliding speed of the elevator can be increased during emergency rescue of the elevator, and rapid rescue is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of elevator control, and in particular relates to an elevator star-sealing loop control system and method. Background Art

[0002] At present, the emergency release and slipping of machine room-less elevators is to maintain the elevator slipping speed at a low speed constant value through the weight difference between the elevator car and the counterweight and the sealing contactor in the sealing circuit. When the elevator stops working abnormally and the rescuers are rescuing the passengers in the elevator car, the rescuers need to observe the elevator car door area signal to stop the elevator car at the door area position, and then manually open the door to let the passengers walk out of the car to complete the rescue. When the distance between elevator floors is large, the operation takes a long time, and the passengers in the elevator car have a long waiting time, which will cause panic in the passengers; secondly, relying on the rescuers' observation of the signal to determine whether the car is in the door area position may have errors, which will have a certain impact on the safety of the rescue; and when the sealing contactor maintains the elevator low-speed slipping, the acceleration and deceleration of the elevator car will change greatly, causing panic to the passengers waiting to be rescued in the elevator car and damage to the elevator mechanical system. Summary of the invention

[0003] In order to overcome the above technical defects, the present invention provides an elevator star-sealing loop control system and method, which can increase the elevator sliding speed during elevator emergency rescue and achieve rapid rescue.

[0004] In order to solve the above problems, the present invention provides an elevator star-sealing loop control system in a first aspect, comprising:

[0005] An adjustable resistance module, a permanent magnet synchronous motor is connected to the adjustable resistance module and a frequency converter in sequence through leads of a three-phase winding, and a normally closed contact of a star-sealing contactor is connected between the adjustable resistance module and the frequency converter;

[0006] The microcomputer module is connected to the adjustable resistance module, and is used to obtain and confirm the running direction and the distance to be slipped of the elevator car according to the real-time position of the elevator car and the weight difference of the counterweight when the elevator car is released and the car is slipping; according to the distance to be slipped, the resistance value of the adjustable resistance module is adjusted to reach the preset maximum elevator slipping speed; when it is detected that the elevator car is approaching the door area, the resistance value of the adjustable resistance module is adjusted to reduce the elevator slipping speed and perform elevator leveling;

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

[0008] Furthermore, it also includes a backup power supply and a backup power supply automatic switch, one end of the backup power supply is connected to the backup power supply automatic switch, and the other end is connected to the microcomputer module; when the elevator power supply circuit stops working, the backup power supply automatic switch is automatically closed to automatically start the backup power supply.

[0009] Furthermore, it also includes a brake circuit, which includes a slip switch and a motor brake coil, and the backup power supply is connected to the motor brake coil through the slip 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] The second aspect of the present invention further provides an elevator star-sealing loop control method, which is applied to the above elevator star-sealing loop control system and comprises the following steps:

[0012] When the elevator is released and the car is sliding, the running direction and the distance to be moved of the elevator car are obtained and confirmed according to the real-time position of the elevator car and the weight difference of the counterweight;

[0013] According to the distance to be slipped, the resistance value of the adjustable resistor is adjusted to make the elevator slip speed reach the preset maximum elevator slip speed;

[0014] When it is detected that the elevator car is approaching the door area, the resistance value of the adjustable resistor is adjusted to reduce the elevator sliding speed and perform elevator leveling.

[0015] Further, when the elevator car is released and the car is sliding, the running direction and the distance to be slid of the elevator car are obtained and confirmed according to the real-time position of the elevator car and the weight difference of the counterweight, including the following steps:

[0016] When the elevator is released and the car is sliding, the real-time position of the elevator car and the weight difference of the counterweight are obtained;

[0017] Confirm the running direction of the elevator car 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 running direction of the elevator car, the distance to the elevator door area closest to the elevator is confirmed, and the waiting distance of the elevator car is obtained.

[0019] Further, the step of adjusting the resistance value of the adjustable resistor according to the distance to be slipped so that the elevator slip speed reaches a preset maximum elevator slip speed includes the following steps:

[0020] According to the distance to be slipped, the resistance value of the adjustable resistor is adjusted, thereby controlling the reduction of the short-circuit current in the star-sealing loop, so that the elevator slip speed reaches the preset maximum elevator slip speed.

[0021] Further, when the elevator car is released and the car is sliding, the following steps are included before obtaining and confirming the running direction and the distance to be moved of the elevator car according to the real-time position of the elevator car and the weight difference of the counterweight:

[0022] Check whether the elevator power supply circuit is working normally. If the elevator power supply circuit stops working, start the backup power supply;

[0023] Confirm that the elevator car door and the landing doors on each floor are closed normally;

[0024] After receiving the start signal from the elevator slip switch, the elevator releases the brake and slips.

[0025] Further, the steps include detecting whether the elevator power supply circuit is working normally. If the elevator power supply circuit stops working, before starting the backup power supply, the steps include:

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

[0027] If the real-time position of the elevator car is outside the elevator door area, check whether the elevator power supply circuit is working normally.

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

[0029] The present invention discloses a control system and method for an elevator star-sealing loop, wherein an adjustable resistance module is connected in series in the star-sealing loop, and when the elevator releases the brake and the car slides, the microcomputer module obtains and confirms the running direction and the distance to be slid of the elevator car according to 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 resistance module according to the distance to be slid, thereby controlling the reduction of the short-circuit current in the star-sealing loop, thereby reducing the resistance suffered by the rotor of the permanent magnet synchronous motor, so that the sliding speed of the elevator car rises to the preset maximum elevator sliding speed, thereby improving the sliding speed of the elevator; when it is detected that the elevator car is close to the door area, the resistance value of the adjustable resistance module is adjusted to reduce the elevator sliding speed, and the elevator is leveled. By adjusting the resistance value of the adjustable resistance module in real time to change the sliding speed during emergency brake release, the sliding speed of the elevator during emergency sliding is improved, and rapid rescue is achieved; at the same time, the psychological impact on the passengers to be rescued in the elevator car can be reduced and damage to the elevator mechanical system can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0031] Figure 1 The connection diagram of the elevator star-sealing loop control system described in Example 1 Figure 1 ;

[0032] Figure 2 The connection diagram of the elevator star-sealing loop control system described in Example 1 Figure 2 ;

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

[0034] Marking description: 1. Adjustable resistance module; 2. Microcomputer module; 3. Permanent magnet synchronous motor; 4. Frequency converter; 5. Star-sealing contactor; 6. Backup power supply; 7. Backup power supply automatic switch; 8. Slip switch; 91. Motor left brake coil; 92. Motor right brake coil; 10. Backup power supply indicator light. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0036] Example 1

[0037] like Figure 1 and Figure 2 The present embodiment discloses an elevator star-sealing loop control system, comprising an adjustable resistance module 1 and a microcomputer module 2, wherein a permanent magnet synchronous motor 3 is connected to the adjustable resistance module 1 and a frequency converter 4 in sequence through leads of a three-phase winding, and a normally closed contact of a star-sealing contactor 5 is connected between the adjustable resistance module 1 and the frequency converter 4; the microcomputer module 2 is connected to the adjustable resistance module 1, and is used to obtain and confirm the running direction and the waiting distance of the elevator car according to the real-time position of the elevator car and the weight difference of the counterweight when the staff manually releases the elevator brake to perform a sliding operation; according to the waiting distance of the car, the resistance value of the adjustable resistance module is adjusted to reach a preset maximum elevator sliding speed; when it is detected that the elevator car is close to the door area, the resistance value of the adjustable resistance 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 respectively.

[0038] Specifically, it also includes a backup power supply 6 and a backup power supply automatic switch 7. One end of the backup power supply 6 is connected to the backup power supply automatic 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 switch 7 is automatically closed and the backup power supply 6 is automatically started.

[0039] Specifically, it also includes a brake circuit, which includes a slip switch 8 and a motor brake coil, and the backup power supply 6 is connected to the motor brake coil through the slip 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 and is used to indicate the working status of the backup power supply 6 .

[0042] The permanent magnet synchronous motor 3 is connected to the adjustable resistance module 1 and the frequency converter 4 in sequence through the leads of the three-phase winding, and the normally closed contact of the star-sealing contactor 5 is connected between the adjustable resistance module 1 and the frequency converter 4; the microcomputer module 2 is connected to the adjustable resistance module 1, the permanent magnet synchronous motor 3 and the frequency converter 4 respectively. When the elevator stops running (including the stop of normal operation of the elevator, the stop of the elevator due to a fault, and the stop of the elevator due to a power outage), the permanent magnet synchronous motor 3 stops working, and the three-phase winding of the permanent magnet synchronous motor 3 starts the star-sealing protection to avoid high-speed slipping due to brake failure. If the three-phase winding of the permanent magnet synchronous motor 3 starts the star-sealing protection, the elevator slips when the brake fails, the star-sealing circuit is short-circuited, and the short-circuit current is large, resulting in a large resistance to the rotor of the permanent magnet synchronous motor 3, which has a braking effect on the elevator slipping, making the elevator slip slowly.

[0043] The present invention adds an adjustable resistance module 1 between the normally closed contacts of the permanent magnet synchronous motor 3 and the star-sealing contactor 5, and the microcomputer module 2 adjusts the resistance of the adjustable resistance module 1, so that the short-circuit current becomes smaller, the resistance of the rotor of the permanent magnet synchronous motor 3 becomes smaller, and the elevator sliding speed is increased; when the elevator sliding speed rises to the preset maximum elevator sliding speed, the microcomputer module 2 stops adjusting the adjustable resistance module, and the elevator slides at the current speed. When the microcomputer module 2 detects that the elevator is about to arrive at the nearest door area, it adjusts the resistance of the adjustable resistance module 1, so that the short-circuit current becomes larger, the resistance of the rotor of the permanent magnet synchronous motor 3 increases, the elevator sliding speed is reduced, and the elevator is leveled.

[0044] When the elevator power supply circuit stops working, the backup power supply switch automatically closes, automatically starts the backup power supply, closes the car sliding switch, and the backup power supply indicator lights up. The backup power supply supplies power to the microcomputer module and the motor brake coil. The motor brake coil is energized, and the elevator releases the brake and slides. The microcomputer module adjusts the adjustable resistor module to adjust the elevator sliding speed. The specific operation and principle are the same as above and will not be repeated here.

[0045] Example 2

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

[0047] S1. When the elevator car is released and the car is sliding, the running direction and the distance to be moved of the elevator car are obtained and confirmed according to 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 brake is released and the car slides, the real-time position of the elevator car and the weight difference of the counterweight are obtained.

[0050] The running direction of the elevator car is confirmed based on the real-time position of the elevator car and the weight difference of the counterweight.

[0051] Based on the real-time position and running direction of the elevator car, the distance to the elevator door area closest to the elevator is confirmed, and the waiting distance of the elevator car is obtained.

[0052] S2. According to the distance to be slipped, the resistance value of the adjustable resistor module is adjusted to control the reduction of the short-circuit current in the star-sealing circuit, so that the elevator slip speed reaches the preset maximum elevator slip speed. By adjusting the resistance value of the adjustable resistor module, the short-circuit current in the star-sealing circuit is reduced, the resistance of the rotor of the permanent magnet synchronous motor is reduced, and the elevator slip speed is increased; when the elevator slip speed rises to the preset maximum elevator slip speed, the resistance value of the adjustable resistor module is stopped to adjust, and the elevator slips at the current speed.

[0053] S3. When it is detected that the elevator car is approaching the door area, the resistance value of the adjustable resistor module is adjusted to increase the short-circuit current, increase the resistance on the rotor of the permanent magnet synchronous motor, reduce the elevator sliding speed, and perform elevator leveling.

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

[0055] Check whether the elevator power supply circuit is working normally. 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 whether the elevator car door and the hall doors on each floor are closed normally.

[0057] If the elevator car door and the hall doors on each floor are closed normally, the elevator will release the brake and slide when receiving the start signal from the elevator slide switch.

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

[0059] When the elevator stops working abnormally, check whether the real-time position of the elevator car is within the elevator door area. If the real-time position of the elevator car is within the elevator door area, the staff will disconnect the elevator power switch and use the triangular key to open the door for rescue.

[0060] If the real-time position of the elevator car is outside the elevator door area, check whether the elevator power supply circuit is working normally.

[0061] The present invention adds an adjustable resistance module between the normally closed contacts of the permanent magnet synchronous motor and the star-sealing contactor, confirms the running direction 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, and adjusts the resistance value of the adjustable resistance module in real time according to the running direction and the distance to be slipped, so as to realize the regulation and control of the elevator slipping speed and improve the slipping speed of the elevator emergency slipping during rescue; on the other hand, the microcomputer module confirms the distance to the elevator door area closest to the elevator based on the real-time position and running direction of the elevator car, and controls the elevator slipping speed by adjusting the elevator slipping speed, so that the elevator can quickly and smoothly reach the nearest elevator door area, realizes rapid rescue, avoids the psychological impact on the passengers to be rescued due to being trapped in the elevator car for a long time, and avoids damage to the elevator mechanical system.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. An elevator star-sealing loop control system, characterized in that: include: An adjustable resistance module, a permanent magnet synchronous motor is connected to the adjustable resistance module and a frequency converter in sequence through leads of a three-phase winding, and a normally closed contact of a star-sealing contactor is connected between the adjustable resistance module and the frequency converter; The microcomputer module is connected to the adjustable resistance module, and is used to obtain and confirm the running direction and the distance to be slipped of the elevator car according to the real-time position of the elevator car and the weight difference of the counterweight when the elevator car is released and the car is slipping; according to the distance to be slipped, the resistance value of the adjustable resistance module is adjusted to reach the preset maximum elevator slipping speed; when it is detected that the elevator car is approaching the door area, the resistance value of the adjustable resistance module is adjusted to reduce the elevator slipping speed and perform elevator leveling; The microcomputer module is also connected to the permanent magnet synchronous motor and the frequency converter respectively.

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

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

4. The elevator star-sealing loop 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 and is used to indicate the working state of the backup power supply.

5. An elevator star-sealing loop control method, applied to the elevator star-sealing loop control system according to any one of claims 1 to 4, characterized in that: The steps include: When the elevator is released and the car is sliding, the running direction and the distance to be moved of the elevator car are obtained and confirmed according to the real-time position of the elevator car and the weight difference of the counterweight; According to the distance to be slipped, the resistance value of the adjustable resistor is adjusted to make the elevator slip speed reach the preset maximum elevator slip speed; When it is detected that the elevator car is approaching the door area, the resistance value of the adjustable resistor is adjusted to reduce the elevator sliding speed and perform elevator leveling.

6. The elevator star-sealing loop control method according to claim 5, characterized in that: When the elevator car is released and the car is sliding, the running direction and the distance to be moved of the elevator car are obtained and confirmed according to the real-time position of the elevator car and the weight difference of the counterweight, including the following steps: When the elevator is released and the car is sliding, the real-time position of the elevator car and the weight difference of the counterweight are obtained; Confirm the running direction of the elevator car based on the real-time position of the elevator car and the weight difference of the counterweight; Based on the real-time position and running direction of the elevator car, the distance to the elevator door area closest to the elevator is confirmed, and the waiting distance of the elevator car is obtained.

7. The elevator star-sealing loop control method according to claim 5, characterized in that: The step of adjusting the resistance value of the adjustable resistor according to the distance to be slipped so that the elevator slip speed reaches the preset maximum elevator slip speed comprises the following steps: According to the distance to be slipped, the resistance value of the adjustable resistor is adjusted, thereby controlling the short-circuit current in the star-sealing loop to decrease, so that the elevator slip speed reaches the preset maximum elevator slip speed.

8. The elevator star-sealing loop control method according to claim 5, characterized in that: When the elevator car is released and the car is sliding, the following steps are included before obtaining and confirming the running direction and the distance to be moved of the elevator car according to the real-time position of the elevator car and the weight difference of the counterweight: Check whether the elevator power supply circuit is working normally. If the elevator power supply circuit stops working, start the backup power supply; Confirm that the elevator car door and the landing doors on each floor are closed normally; After receiving the start signal from the elevator slip switch, the elevator releases the brake and slips.

9. The elevator star-sealing loop control method according to claim 8, characterized in that: Steps: Check 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: When the elevator stops working abnormally, check whether the real-time position of the elevator car is within the elevator door area; If the real-time position of the elevator car is outside the elevator door area, check whether the elevator power supply circuit is working normally.

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