Phase-changeable soft start motor control module

Abstract

The utility model discloses a phase-changeable soft start motor control module, belongs to the field of motor start, and solves the problem that a motor in the prior art cannot realize the functions of soft start and soft stop. The device mainly comprises a control unit, the control unit comprises an MCU controller, the MCU controller is connected with a relay driving module, the relay driving module is connected with a relay, one end of the relay is electrically connected with a current input module, the other end of the relay is electrically connected with a silicon controlled rectifier module through a commutation circuit, and the silicon controlled rectifier module comprises a silicon controlled rectifier assembly and a trigger module. The trigger module is electrically connected with the MCU controller; the silicon-controlled module is connected with a motor load. Soft start of the lifting motor is realized through the silicon controlled rectifier module, input current is gradually increased, large current impact during direct start is avoided, instantaneous stress on the motor, a power supply and a mechanical structure is reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of lifting platforms, and more specifically, to a switchable soft-start motor control module. Background Technology

[0002] Motor commutation is a core technology for the operation of mechanically commutator-less motors such as brushless DC motors and stepper motors. Essentially, it involves electronically controlling the sequential switching of the energizing phases of the stator windings to maintain continuous rotor rotation or stepping motion. Existing technology, application CN203416205U, discloses a motor commutation control circuit that uses a first, second, third, and fourth transistor in conjunction for commutation. However, it lacks protection for the motor load, and currently, there is a lack of a control module that simultaneously provides soft start and soft stop during commutation. Utility Model Content

[0003] The purpose of this invention is to provide a commutative soft-start motor control module to solve the problem that the existing technology cannot achieve soft start and soft stop functions when the motor load is commutated.

[0004] This utility model is achieved through the following technical solution:

[0005] A commutative soft-start motor control module includes a control unit, which includes an MCU controller. The MCU controller is connected to a relay drive module, which is connected to a relay module. One end of the relay module is electrically connected to a current input module, and the other end is electrically connected to a thyristor module through a commutation circuit. The thyristor module includes a thyristor component and a trigger module, which is electrically connected to the MCU controller. The thyristor module is connected to the motor load.

[0006] Furthermore, the commutation circuit includes a three-phase power input and a three-phase output link. The three-phase power input includes phase R, phase S, and phase T, and the three-phase output link includes phase U1, phase V1, phase W1, phase U2, phase V2, and phase W2. The thyristor components include thyristors SCR1, SCR2, SCR3, SCR4, SCR5, and SCR6. The relay module includes normally open contacts KM1, KM2, KM3, KM4, and KM5. Phase T passes through the normally open relay contact KM5. SCR3 and SCR6 are electrically connected respectively. SCR3 is electrically connected to phase W1, and SCR6 is electrically connected to phase W2. Phase S is electrically connected to normally open contacts KM3 and KM4 respectively. Normally open contact KM3 is electrically connected to SCR1 and SCR4 respectively. SCR1 is electrically connected to phase U1, and SCR4 is electrically connected to phase U2. Phase R is electrically connected to normally open contacts KM1 and KM2 respectively. Normally open contact KM1 is electrically connected to SCR1 and SCR4 respectively.

[0007] Furthermore, the control unit includes input terminals, which include brake signal control terminals, forward / reverse control signal input terminals, limit control signal input terminals, and wire breakage protection control signal input terminals; each of the brake signal control terminals, forward / reverse control signal input terminals, limit control signal input terminals, and wire breakage protection control signal input terminals is connected to a control switch.

[0008] Furthermore, the MCU controller is connected to a detection module, which includes a phase detection module, a balance detection module, and a current detection module.

[0009] Furthermore, the MCU controller is connected to a detection module, which includes a phase detection module, a balance detection module, and a current detection module.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This invention combines a commutation circuit with a thyristor module to support forward and reverse motor control, reducing mechanical wear and failure rates; it achieves high reliability, flexibility, and improved energy efficiency in the motor control system. This invention uses the thyristor module to achieve soft starting of the motor load, gradually increasing the input current to avoid the large current surge during direct starting, reducing instantaneous stress on the motor, power supply, and mechanical structure, and extending equipment lifespan. The MCU precisely controls the conduction angle of the thyristor through a trigger module, smoothly adjusting voltage or current and improving start-up stability. Attached Figure Description

[0012] Figure 1This is a block diagram of the MCU controller structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the circuit connection of the thyristor module of this utility model. Detailed Implementation

[0014] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments in this application, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the scope of protection of this application. Furthermore, the directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the creation of this utility model.

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Example 1: A commutative soft-start motor control module, such as... Figure 1 and Figure 2 As shown, the system includes a control unit, which comprises an MCU controller. The MCU controller is connected to a relay drive module, which in turn connects to a relay. One end of the relay is electrically connected to a current input module, and the other end is electrically connected to a thyristor module via a commutation circuit. The thyristor module includes a thyristor assembly and a trigger module. The trigger module is electrically connected to the MCU controller. The MCU controller precisely controls the conduction angle of the thyristor through the trigger module, smoothly adjusting the voltage / current and improving startup stability. The thyristor module is connected to a motor load. The thyristor module enables soft starting of the motor load, gradually increasing the input current to avoid the large current surge during direct starting, reducing instantaneous stress on the motor, power supply, and mechanical structure, and extending equipment lifespan. The relay is responsible for the main circuit's on / off state, while the thyristor provides precise control; their clear division of labor reduces the impact of a single component failure on the system.

[0017] Example 2: A commutative soft-start motor control module, wherein the commutation circuit includes a three-phase power input and a three-phase output link. The three-phase power input includes R phase, S phase, and T phase, and the three-phase output link includes U1 phase, V1 phase, W1 phase, U2 phase, V2 phase, and W2 phase; the thyristor components include thyristors SCR1, SCR2, SCR3, SCR4, SCR5, and SCR6; the relay module includes normally open contacts KM1, KM2, KM3, KM4, and KM5; the T phase is connected via a relay. Normally open contact KM5 is electrically connected to SCR3 and SCR6 respectively. SCR3 is electrically connected to phase W1, and SCR6 is electrically connected to phase W2. Phase S is electrically connected to normally open contact KM3 and normally open contact KM4 respectively. Normally open contact KM3 is electrically connected to SCR1 and SCR4 respectively. SCR1 is electrically connected to phase U1, and SCR4 is electrically connected to phase U2. Phase R is electrically connected to normally open contact KM1 and normally open contact KM2 respectively. Normally open contact KM1 is electrically connected to SCR1 and SCR4 respectively. When the motor load needs to rotate forward, the MCU controller controls the closure of normally open contact KM1, normally open contact KM2, and normally open contact KM5. Under the control of the MCU controller, SCR1, SCR2, and SCR3 adjust the phase of the trigger pulse (conduction angle α) to regulate the effective value of the output voltage. The smaller the conduction angle α, the lower the output voltage; as α gradually increases, the output voltage gradually approaches full voltage. When the motor load needs to be reversed, the MCU controller closes normally open contacts KM3, KM4, and KM5. Under the control of the MCU controller, SCR1, SCR2, and SCR3 adjust the phase of the trigger pulse to regulate the effective value of the output voltage.

[0018] The control unit includes input terminals, including brake signal control terminals, forward / reverse control signal input terminals, limit control signal input terminals, and wire breakage protection control signal input terminals. Each of these terminals is connected to a control switch and has an indicator light. The brake signal control terminals include left and right motor brake control terminals, both internally normally open contacts with a capacity of 5A / 250VAC. In an emergency, the brake signal quickly locks the motor, ensuring a safe stop. The forward / reverse control signal input terminals include up and down control signal input terminals, both active high. The limit control signal input terminals include upper limit control signal input terminals and extreme limit control signal input terminals. If the upper limit control signal input terminal receives a signal, the module is only allowed to descend. The limit signal input terminals detect the platform position in real time to prevent mechanical collisions or falls caused by over-limit operation. If the extreme limit control signal input terminal receives a signal (low level, corresponding indicator light off), the module stops ascending and descending. If the disconnection protection control signal input terminal receives a signal (low level, corresponding indicator light off), the module stops ascending and descending, detects the continuity of the circuit, and promptly cuts off the power supply to prevent equipment malfunction after a disconnection.

[0019] The MCU controller is connected to a detection module, which includes a phase detection module, a balance detection module, and a current detection module. The phase detection module ensures that the power supply phase is synchronized with the motor drive, avoiding efficiency loss or equipment damage caused by phase misalignment. The current detection module monitors the current magnitude in real time, triggering overload protection or alarms to prevent motor burnout. The balance detection module, for dual-motor systems, dynamically adjusts the output power to maintain load balance.

[0020] The control unit includes an alarm connected to the MCU controller. The positive terminal of the alarm is connected to the COM terminal, and the alarm sounds when a fault occurs. When overcurrent, open circuit, phase abnormality, or motor imbalance is detected, the MCU immediately triggers an audible and visual alarm to alert the operator and reduce the risk of the fault escalating. Everything else is the same as in Embodiment 1.

[0021] When multiple modules are used simultaneously, all modules use the same 12V power supply from the same module as their control power supply. To ensure the reliability of the control power supply, no more than three modules should be used at the same time.

[0022] In use, the MCU controller performs a self-check on the system via a detection module to confirm that the power phase is normal, the wiring is unbroken, and the motor's initial position is balanced. If an abnormality is detected, the MCU controller immediately triggers an alarm and locks the relay, preventing start-up. The operator sends a start command through the forward / reverse control signal input terminals, and the MCU controller closes the relay via the relay drive module, turning on the main circuit. According to a preset soft-start curve, the MCU controller adjusts the conduction angle of the thyristor via the trigger module, gradually increasing the output voltage or current to the target value. The soft-start control module, through phased control and multi-module collaboration, achieves safe, stable, and efficient operation of the lifting platform.

[0023] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of this application should still fall within the scope of the present invention.

Claims

1. A commutative soft-start motor control module, comprising a control unit, characterized in that: The control unit includes an MCU controller, which is connected to a relay drive module. The relay drive module is connected to a relay module. One end of the relay module is electrically connected to a current input module, and the other end is electrically connected to a thyristor module through a commutation circuit. The thyristor module includes a thyristor component and a trigger module. The trigger module is electrically connected to the MCU controller. The thyristor module is connected to the motor load.

2. The commutative soft-start motor control module according to claim 1, characterized in that: The commutation circuit includes a three-phase power input and a three-phase output link. The three-phase power input includes phase R, phase S, and phase T. The three-phase output link includes phase U1, phase V1, phase W1, phase U2, phase V2, and phase W2. The thyristor components include thyristors SCR1, SCR2, SCR3, SCR4, SCR5, and SCR6. The relay module includes normally open contacts KM1, KM2, KM3, KM4, and KM5. Phase T is electrically connected to thyristors SCR3 and SCR6 via relay normally open contact KM5. Thyristor SCR3 is electrically connected to phase W1, and SCR6 is electrically connected to phase W2. Phase S is electrically connected to normally open contacts KM3 and KM4 respectively; normally open contact KM3 is electrically connected to thyristors SCR1 and SCR4 respectively, thyristor SCR1 is electrically connected to phase U1, and thyristor SCR4 is electrically connected to phase U2; Phase R is electrically connected to normally open contacts KM1 and KM2 respectively; normally open contact KM1 is electrically connected to thyristors SCR1 and SCR4 respectively.

3. The commutative soft-start motor control module according to claim 1, characterized in that: The control unit includes input terminals, which include brake signal control terminals, forward / reverse control signal input terminals, limit control signal input terminals, and wire breakage protection control signal input terminals; each of the brake signal control terminals, forward / reverse control signal input terminals, limit control signal input terminals, and wire breakage protection control signal input terminals is connected to a control switch.

4. The commutative soft-start motor control module according to claim 1, characterized in that: The MCU controller is connected to a detection module, which includes a phase detection module, a balance detection module, and a current detection module.

5. The commutative soft-start motor control module according to claim 1, characterized in that: The control unit includes an alarm, which is connected to the MCU controller.

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