Star sealing control circuit and speed control device for elevator without machine room

Abstract

The utility model discloses a star-sealing control circuit and a speed control device for an elevator without a machine room. The star-sealing control circuit comprises short-circuit control circuits and normally open contacts which are in one-to-one correspondence with access ends; the adjacent access ends are connected through corresponding normally open contacts; the short-circuit control circuit is used for receiving a level signal and closing or opening a corresponding normally open contact based on the level signal; when each short circuit control circuit receives a high level signal, the corresponding normally open contact is closed, each access end is short-circuited, star-sealing control of the permanent magnet synchronous motor is triggered, and the running speed of a motor rotor is reduced, so that the running speed of an elevator car is reduced. And the lift car keeps moving at a low constant speed during elevator emergency rescue, so that the safety of elevator rescue is ensured.

Description

Technical Field

[0001] The utility model relates to the field of machine room-less elevators, in particular to a star-sealing control circuit and a speed control device for machine room-less elevators. Background Art

[0002] Due to its unique design, the machine room-less elevator eliminates the traditional machine room, integrates key equipment such as the traction machine and control cabinet, and arranges them compactly in the hoistway or on the top, which poses new challenges to the safety design and emergency rescue of the elevator.

[0003] When a power outage or other faults occur in a machine room-less elevator and the car stops running, it is impossible for professionals to enter the machine room to manually release the brake and perform the turning operation to move the car like in a machine room elevator. Machine room-less elevators usually rely on built-in emergency operation and rescue systems, such as remote electric brake release devices, to release the traction machine brakes through the control system or special rescue tools when necessary, and to adjust the car position by using the natural balance state of the car and the counterweight so that passengers can leave safely.

[0004] However, in this rescue process after remote brake release, controlling the speed of the car becomes a difficult point due to the lack of direct human intervention and real-time speed perception. Utility Model Content

[0005] In order to keep the car moving at a low constant speed and ensure the safety of elevator rescue during the rescue process when the traction machine brake is not braked, the utility model proposes a star-sealing control circuit for a machine room-less elevator, the machine room-less elevator comprising: a permanent magnet synchronous motor including a U-phase access terminal, a V-phase access terminal and a W-phase access terminal, and the star-sealing control circuit comprises:

[0006] A short-circuit control circuit and a normally open contact corresponding to each access terminal;

[0007] Adjacent access terminals are connected via corresponding normally open contacts;

[0008] The short-circuit control circuit is used to receive a level signal and close or open its corresponding normally open contact based on the level signal; when each short-circuit control circuit receives a high level signal, its corresponding normally open contact is closed and each access terminal is short-circuited.

[0009] Furthermore, the normally open contact is specifically:

[0010] A first normally open contact corresponding to the U phase access terminal;

[0011] A second normally open contact corresponding to the V phase access terminal;

[0012] The third normally open contact corresponding to the W phase access terminal.

[0013] Furthermore, one end of the first normally open contact is connected to the U phase access terminal; one end of the second normally open contact is connected to the other end of the first normally open contact and then connected to the V phase access terminal, and the other end is connected to one end of the third normally open contact; the other end of the third normally open contact is connected to the W phase access terminal.

[0014] Furthermore, the short circuit control circuit comprises:

[0015] The transistor Q1 controls the relay coil corresponding to the normally open contact; the base of the transistor Q1 is connected to the first current limiting resistor R1 and one end of the pull-down resistor R2, the emitter is connected to the other end of the pull-down resistor R2 and then connected to the signal ground, the collector is connected to one end of the second current limiting resistor R3, the positive electrode of the diode D1, and one end of the relay coil; the other end of the relay coil is connected to the positive power supply; the other end of the second current limiting resistor R3 is connected to the negative end of the LED lamp; the positive end of the LED lamp is connected to the negative electrode of the diode D1 and then connected between the relay coil and the positive power supply; the other end of the first current limiting resistor R1 is connected to the level signal.

[0016] The utility model also proposes a speed control device for a machine room-less elevator, comprising:

[0017] A power control module for connecting to an external power source and providing power to each module in the speed control device;

[0018] MCU main control module;

[0019] The power monitoring unit is used to monitor the input of the external power supply. When it is detected that there is no external power supply input, a power failure signal is generated and sent to the power monitoring unit of the MCU main control module;

[0020] A rescue release button used to generate a rescue start signal and send it to the MCU main control module;

[0021] An inverter module connected to the traction machine brake;

[0022] The star sealing control circuit as described above;

[0023] The MCU main control module is used to send a high-level signal to each short-circuit control circuit in the star-sealing control circuit when receiving a power outage signal and a rescue start signal, so as to short-circuit each access terminal, thereby realizing the motor star-sealing braking;

[0024] The traction machine brake is in a braking state when power is lost;

[0025] The MCU main control module is also used to control the inverter module to output a starting voltage to the traction machine brake to release the brake of the traction wheel during the motor star-locking braking period after sending a high-level signal.

[0026] Furthermore, the speed control device also includes: a backup battery pack, and a charging circuit module electrically connected to the power control module.

[0027] Furthermore, the charging circuit module is used to charge the backup battery pack through the electric energy output by the power control module.

[0028] Furthermore, the backup battery pack is electrically connected to the inverter module.

[0029] Furthermore, the MCU main control module is specifically used to send an inverter start signal to the inverter module after sending a high-level signal; after receiving the inverter start signal, the inverter module converts the power output by the backup battery pack and outputs it to the traction machine brake.

[0030] Furthermore, the MCU main control module also includes: a plurality of output points; the output points correspond one-to-one to the short-circuit control circuits.

[0031] Compared with the prior art, the utility model has at least the following beneficial effects:

[0032] (1) In the present invention, the star-locking control circuit includes: a short-circuit control circuit and a normally open contact corresponding to each access terminal; adjacent access terminals are connected through corresponding normally open contacts; the short-circuit control circuit is used to receive a level signal and close or open its corresponding normally open contact based on the level signal; when each short-circuit control circuit receives a high-level signal, its corresponding normally open contact is closed, each access terminal is short-circuited, triggering the star-locking control of the permanent magnet synchronous motor, reducing the running speed of the motor rotor, thereby reducing the running speed of the elevator car. The present invention can realize the star-locking braking of the permanent magnet synchronous motor through this circuit, so that the motor keeps a low constant speed rotation during emergency rescue of the elevator, thereby ensuring the safety of the elevator rescue;

[0033] (2) In the utility model, the MCU main control module is used to send a high-level signal to each short-circuit control circuit in the star-sealing control circuit to short-circuit each access terminal when receiving a power failure signal and a rescue start signal; it is also used to control the inverter module to output a starting voltage to the traction machine brake to release the brake of the traction wheel during the motor star-sealing braking period after sending a high-level signal, so that the motor can still rotate at a relatively low and constant safe speed when the power is off and the traction machine brake is not braking, thereby improving the safety of elevator rescue;

[0034] (3) The utility model independently drives the three relay coils KMU, KMV and KMW through the three transistors Q1, Q2 and Q3. When the three high-power relay coils are energized, the corresponding normally open contacts are closed, which will short-circuit the U / V / W three-phase windings of the permanent magnet synchronous motor, namely the U-phase access terminal, the V-phase access terminal and the W-phase access terminal. That is, the utility model is based on the working principle of the permanent magnet synchronous motor. By short-circuiting the three-phase windings of the motor, the electromagnetic torque generated by the traction machine during the rotation process is used to effectively consume the mechanical energy generated by the change of the car position and release the brake of the traction wheel, so that the motor can still rotate at a relatively low and constant safe speed in the off-power state, which greatly ensures the safety of the elevator rescue process and also improves the convenience and effectiveness of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is the star sealing control circuit diagram;

[0036] Figure 2 The present invention is a structural diagram of a speed control device for a machine room-less elevator. DETAILED DESCRIPTION

[0037] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0038] It should be noted that the permanent magnet synchronous motor in this embodiment is an important component of the elevator drive system and the central component of the entire elevator traction drive system, responsible for driving the elevator to rise and fall;

[0039] The traction machine brake is a safety component that acts directly on the traction wheel driven by the permanent magnet synchronous motor and is used to reliably stop the car.

[0040] In order to keep the motor running at a low constant speed when the traction machine brake is not braking during the rescue process, so as to ensure the safety of the elevator rescue, such as Figure 1 As shown, the utility model proposes a star-sealing control circuit for a machine room-less elevator, the machine room-less elevator comprising: a permanent magnet synchronous motor including a U-phase access terminal, a V-phase access terminal and a W-phase access terminal; the star-sealing control circuit comprises:

[0041] A short-circuit control circuit and a normally open contact corresponding to each access terminal;

[0042] The normally open contacts are specifically:

[0043] A first normally open contact corresponding to the U phase access terminal;

[0044] A second normally open contact corresponding to the V phase access terminal;

[0045] The third normally open contact corresponding to the W phase access terminal.

[0046] Adjacent access terminals are connected via corresponding normally open contacts;

[0047] One end of the first normally open contact is connected to the U phase access terminal; one end of the second normally open contact is connected to the other end of the first normally open contact and then connected to the V phase access terminal, and the other end is connected to one end of the third normally open contact; the other end of the third normally open contact is connected to the W phase access terminal.

[0048] The short-circuit control circuit is used to receive a level signal and close or open its corresponding normally open contact based on the level signal; when each short-circuit control circuit receives a high-level signal, its corresponding normally open contact is closed and each access terminal is short-circuited.

[0049] The short circuit control circuit comprises:

[0050] The transistor controls the relay coil corresponding to the normally open contact; the base of the transistor is connected to the first current limiting resistor and one end of the pull-down resistor, the emitter is connected to the other end of the pull-down resistor and then connected to the signal ground, the collector is connected to one end of the second current limiting resistor, the positive pole of the diode, and one end of the relay coil; the other end of the relay coil is connected to the positive power supply; the other end of the second current limiting resistor is connected to the negative end of the LED lamp; the positive end of the LED lamp is connected to the negative pole of the diode and then connected between the relay coil and the positive power supply; the other end of the first current limiting resistor is connected to the level signal.

[0051] Specifically, Figure 1 As shown, the star sealing control circuit includes:

[0052] A short-circuit control circuit corresponding to the U-phase access end, in which: the base of the transistor Q1 is connected to the first current limiting resistor R1 and one end of the pull-down resistor R2, the emitter is connected to the other end of the pull-down resistor R2 and then connected to the signal ground, the collector is connected to one end of the second current limiting resistor R3, the positive electrode of the diode D1, and one end of the relay coil KMU; the other end of the relay coil KMU is connected to the positive power supply; the other end of the second current limiting resistor R3 is connected to the negative end of the LED lamp LED1; the positive end of the LED lamp LED1 is connected to the negative electrode of the diode D1 and then connected between the relay coil KMU and the positive power supply VCC; the other end of the first current limiting resistor R1 is connected to the level signal UC+.

[0053] A short-circuit control circuit corresponding to the V-phase access end, in which: the base of the transistor Q2 is connected to the first current limiting resistor R4 and one end of the pull-down resistor R5, the emitter is connected to the other end of the pull-down resistor R5 and then connected to the signal ground, the collector is connected to one end of the second current limiting resistor R6, the positive electrode of the diode D2, and one end of the relay coil KMV; the other end of the relay coil KMV is connected to the positive power supply VCC; the other end of the second current limiting resistor R6 is connected to the negative end of the LED lamp LED2; the positive end of the LED lamp LED2 is connected to the negative electrode of the diode D2 and then connected between the relay coil KMV and the positive power supply VCC; the other end of the first current limiting resistor R4 is connected to the level signal VC+.

[0054] A short-circuit control circuit corresponding to the W phase access end, in which: the base of the transistor Q3 is connected to the first current limiting resistor R7 and one end of the pull-down resistor R8, the emitter is connected to the other end of the pull-down resistor R8 and then connected to the signal ground, the collector is connected to one end of the second current limiting resistor R9, the positive electrode of the diode D3, and one end of the relay coil KMW; the other end of the relay coil KMW is connected to the positive power supply VCC; the other end of the second current limiting resistor R9 is connected to the negative end of the LED lamp LED3; the positive end of the LED lamp LED3 is connected to the negative electrode of the diode D3 and then connected between the relay coil KMW and the positive power supply VCC; the other end of the first current limiting resistor R7 is connected to the level signal WC+.

[0055] It should be noted that the emitters of the transistors corresponding to the short-circuit control circuits are all connected to the same signal ground, that is, the emitters of the transistors Q1, Q2, and Q3 are all connected to the same signal ground.

[0056] The utility model independently drives the three relay coils KMU, KMV and KMW through the three transistors Q1, Q2 and Q3 respectively. When the three high-power relay coils are energized, the corresponding normally open contacts are closed, which will short-circuit the U / V / W three-phase windings of the permanent magnet synchronous motor, namely the U-phase access terminal, the V-phase access terminal and the W-phase access terminal; that is, the utility model is based on the working principle of the permanent magnet synchronous motor, and through the short-circuit design of the three-phase winding of the motor, the electromagnetic torque generated by the traction machine during the rotation process is used to effectively consume the mechanical energy generated by the change of the car position, thereby reducing the running speed of the motor rotor. The utility model can realize the permanent magnet synchronous motor star-sealing braking through this circuit, so that the car can maintain a relatively low constant speed movement during elevator emergency rescue, thereby improving the safety of elevator rescue.

[0057] Embodiment 2

[0058] In order to ensure that the car can run at a low and constant safe speed when it is not powered, Figure 2As shown, the utility model also proposes a speed control device for a machine room-less elevator, and it needs to be explained that:

[0059] When the elevator is in normal working mode, the power control module converts the external power supply AC220V supply voltage and supplies power to each module, while the charging circuit module charges the backup battery pack. The power monitoring unit detects the external AC220V voltage and converts the voltage signal into a control signal to the MCU main controller. At this time, the emergency rescue operation function is invalid (that is, the MCU main control module will not send a high-level signal, and the star-sealing control circuit will not be turned on). The star-sealing control circuit is in an open circuit state and will not perform speed control.

[0060] The speed control device comprises:

[0061] A power control module for connecting to an external power source and providing power to each module in the speed control device;

[0062] Specifically, the power control module is used to convert the external power supply AC220V into a working voltage of a preset amplitude required by each module, and output it to the corresponding module.

[0063] MCU main control module;

[0064] The power monitoring unit is used to monitor the input of the external power supply. When it is detected that there is no external power supply input, a power failure signal is generated and sent to the power monitoring unit of the MCU main control module;

[0065] A rescue brake release button used to generate a rescue start signal and send it to the MCU main control module;

[0066] An inverter module connected to the traction machine brake;

[0067] The star sealing control circuit as described in the first embodiment; in this embodiment, the positive power supply VCC of the star sealing control circuit is provided by the MCU main control module;

[0068] The MCU main control module also includes: a plurality of output points; the output points correspond one to one with the short-circuit control circuit. Specifically: the MCU main control module includes:

[0069] A first output point P1.0 that sends a level signal to the short-circuit control circuit corresponding to the U-phase access terminal, which is connected to one end of the first current-limiting resistor R1;

[0070] A second output point P1.1 that sends a level signal to the short-circuit control circuit corresponding to the V-phase access terminal, which is connected to one end of the first current limiting resistor R4;

[0071] The third output point P1.2 that sends a level signal to the short-circuit control circuit corresponding to the W-phase access terminal is connected to one end of the first current limiting resistor R7.

[0072] The MCU main control module is used to send a high level signal to each short-circuit control circuit in the satellite sealing control circuit to short-circuit each access terminal when receiving a power outage signal and a rescue start signal;

[0073] Specifically, the high-level signal is transmitted to the base of the transistors Q1, Q2 and Q3 through the current-limiting resistors R1, R4 and R7 respectively. At this time, the collectors and emitters of the three transistors are turned on, the three high-power relay coils KMU, KMV and KMW are energized, and the corresponding normally open contacts are closed, so that the U / V / W three-phase windings of the permanent magnet synchronous motor are short-circuited successfully, and the star-sealing function is realized. In addition, the main function of the pull-down resistors R2, R5 and R8 in the star-sealing control circuit is to ensure the working stability of the three transistors (Q1, Q2 and Q3), and the diodes D1, D2 and D3 are connected to the two ends of the relay coils KMU, KMV and KMW as protection elements to absorb the back-electromotive force voltage generated after the relay coils are powered off, and the current-limiting resistors R3, R6 and R9 are connected in series with the light-emitting diodes LED1, LED2 and LED3 and connected to the two ends of the three high-power relay coils KMU, KMV and KMW respectively to indicate the action status of the high-power relays.

[0074] It should be noted that the rescue release button is set in the car or in the emergency rescue operation cabinet outside the hall. If the user needs to start the speed control device, the rescue release button needs to be pressed all the time. When the rescue release button is pressed all the time, a rescue start signal will be generated all the time. If it is detected that there is no input to the external power supply at the same time, the MCU main control module will send a high-level signal to the star-sealing control circuit all the time, and when sending a high-level signal, it will control the inverter module to output a starting voltage to the traction machine brake to release the brake of the traction wheel during the motor star-sealing braking. After the rescue release button is released, the star-sealing control circuit is disconnected, the motor star-sealing braking ends, and the MCU main control module will control the inverter module to stop outputting the starting voltage to the traction machine brake. The traction machine brake loses power and is in a braking state, and the elevator car stops.

[0075] It should be noted that the first output point P1.0, the second output point P1.1 and the third output point P1.2 are at low potential under normal circumstances (ie when the MCU main control module does not send a high level signal), so the star-sealing control circuit will not be turned on.

[0076] The traction machine brake is in a braking state when it loses power; (the inverter module stops outputting electric energy to the traction machine brake, and the traction machine brake loses power; and when the MCU main control module sends an inverter start signal to the inverter module, the inverter module starts to convert the power output by the backup battery pack and outputs it to the traction machine brake, and the traction machine brake is powered and stops braking);

[0077] The MCU main control module is also used to control the inverter module to output a starting voltage to the traction machine brake to release the brake of the traction wheel during the motor star-locking braking period after sending a high-level signal (indicating that the U-phase access terminal, the V-phase access terminal, and the W-phase access terminal have been short-circuited).

[0078] The speed control device also includes: a backup battery pack and a charging circuit module electrically connected to the power control module.

[0079] The charging circuit module is used to charge the backup battery pack through the electric energy output by the power control module.

[0080] The backup battery pack is electrically connected to the inverter module.

[0081] The MCU main control module is specifically used to send an inverter start signal to the inverter module after sending a high-level signal; after receiving the inverter start signal, the inverter module converts the power output by the backup battery pack and outputs it to the traction machine brake.

[0082] In the utility model, the MCU main control module is used to send a high-level signal to each short-circuit control circuit in the star-sealing control circuit to short-circuit each access terminal when receiving a power outage signal and a rescue start signal; it is also used to control the inverter module to output a starting voltage to the traction machine brake after sending a high-level signal to release the brake of the traction wheel during the motor star-sealing braking period, so that the car can still move at a relatively low and constant safe speed when the power is off and the traction machine brake is not braked, thereby improving the safety of elevator rescue.

[0083] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0084] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0085] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A star-sealing control circuit for a machine-room-less elevator, the machine-room-less elevator comprising: A permanent magnet synchronous motor comprising a U-phase access terminal, a V-phase access terminal and a W-phase access terminal, characterized in that it comprises: A short-circuit control circuit and a normally open contact corresponding to each access terminal; Adjacent access terminals are connected via corresponding normally open contacts; The short-circuit control circuit is used to receive a level signal and close or open its corresponding normally open contact based on the level signal; when each short-circuit control circuit receives a high-level signal, its corresponding normally open contact is closed and each access terminal is short-circuited.

2. A star-sealing control circuit for a machine room-less elevator according to claim 1, characterized in that: The normally open contacts are specifically: A first normally open contact corresponding to the U phase access terminal; A second normally open contact corresponding to the V phase access terminal; The third normally open contact corresponding to the W phase access terminal.

3. A star-sealing control circuit for a machine-room-less elevator according to claim 2, characterized in that: One end of the first normally open contact is connected to the U phase access terminal; one end of the second normally open contact is connected to the other end of the first normally open contact and then connected to the V phase access terminal, and the other end is connected to one end of the third normally open contact; the other end of the third normally open contact is connected to the W phase access terminal.

4. A star-sealing control circuit for a machine-room-less elevator according to claim 3, characterized in that: The short circuit control circuit comprises: The transistor controls the relay coil corresponding to the normally open contact; the base of the transistor is connected to the first current limiting resistor and one end of the pull-down resistor, the emitter is connected to the other end of the pull-down resistor and then connected to the signal ground, the collector is connected to one end of the second current limiting resistor, the positive pole of the diode, and one end of the relay coil; the other end of the relay coil is connected to the positive power supply; the other end of the second current limiting resistor is connected to the negative end of the LED lamp; the positive end of the LED lamp is connected to the negative pole of the diode and then connected between the relay coil and the positive power supply; the other end of the first current limiting resistor is connected to the level signal.

5. A speed control device for a machine room-less elevator, characterized in that: include: A power control module for connecting to an external power source and providing power to each module in the speed control device; MCU main control module; The power monitoring unit is used to monitor the input of the external power supply. When it is detected that there is no external power supply input, a power failure signal is generated and sent to the power monitoring unit of the MCU main control module; A rescue release button used to generate a rescue start signal and send it to the MCU main control module; An inverter module connected to the traction machine brake; The star-sealing control circuit according to any one of claims 1 to 4; The MCU main control module is used to send a high level signal to each short-circuit control circuit in the satellite sealing control circuit to short-circuit each access terminal when receiving a power outage signal and a rescue start signal; The traction machine brake is in a braking state when power is lost; The MCU main control module is also used to control the inverter module to output a starting voltage to the traction machine brake to release the brake of the traction wheel during the motor star-locking braking period after sending a high-level signal.

6. A speed control device for a machine room-less elevator according to claim 5, characterized in that: The speed control device also includes: a backup battery pack and a charging circuit module electrically connected to the power control module.

7. A speed control device for a machine room-less elevator according to claim 6, characterized in that: The charging circuit module is used to charge the backup battery pack through the electric energy output by the power control module.

8. A speed control device for a machine room-less elevator according to claim 7, characterized in that: The backup battery pack is electrically connected to the inverter module.

9. A speed control device for a machine room-less elevator according to claim 8, characterized in that: The MCU main control module is specifically used to send an inverter start signal to the inverter module after sending a high-level signal; after receiving the inverter start signal, the inverter module converts the power output by the backup battery pack and outputs it to the traction machine brake.

10. A speed control device for a machine room-less elevator according to claim 9, characterized in that: The MCU main control module also includes: a plurality of output points; the output points correspond one to one with the short-circuit control circuits.

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