Reel motor control circuit with delayed shutdown function

Abstract

The utility model relates to a reel motor control circuit with a delayed shutdown function. The reel motor control circuit comprises a power supply switch control module used for controlling on-off of a power supply switch module and the power supply switch module used for controlling on-off of power supply of a motor. According to the technical scheme, due to the fact that the power supply switch control module is introduced into the reel motor control circuit, the power supply switch module can be turned off in a delayed mode after power failure, the downtime of the reel motor is prolonged, the reel motor and the three-phase double-speed motor are prevented from stopping synchronously, and the problem of thread loosening is solved. The introduced power supply switch module has an arc extinguishing effect, and the reliability of the system is improved.

Description

Technical Field

[0001] This utility model relates to the field of motor control technology, and in particular to a reel motor control circuit with a delayed stop function. Background Technology

[0002] The in-core measurement system of a nuclear power plant uses a uranium-235 neutron probe to measure the in-core neutron flux. It is driven by a three-phase dual-speed motor, capable of four modes: high-speed forward movement, high-speed backward movement, low-speed forward movement, and low-speed backward movement within the core. Due to the long measurement path of the neutron probe, a 30m drive cable is installed at its tail. This drive cable must remain taut throughout all four movement modes; any loosening could cause the probe to jam or even damage the drive cable. Therefore, a reel motor is required to tighten the drive cable. This reel motor must work in conjunction with the three-phase dual-speed motor to maintain cable tension.

[0003] The host computer synchronously controls the reel motor and the three-phase dual-speed motor. When the host computer issues a stop command for both, and the reel motor and the three-phase dual-speed motor stop synchronously, inertia often causes the cable to become loose, resulting in a slack cable problem. Furthermore, if arcing occurs in the high-current circuit supplying power to the reel motor, it will affect the reliability of the system. Utility Model Content

[0004] The technical problem to be solved by this application is to provide a reel motor control circuit with a delayed stop function, including a power supply switch module and a power supply switch control module;

[0005] The power supply switch module is connected between the reel motor and the power supply module that supplies power to the reel motor;

[0006] The power supply switch control module includes a switch unit, a charging / discharging unit, and an execution unit;

[0007] The switching unit is connected to the charging and discharging unit, the execution unit, and an external first working voltage source; the execution unit is connected to the charging and discharging unit and the power supply switching module.

[0008] When the switch unit is closed, the external first working voltage source charges the charging and discharging unit and drives the execution unit to control the power supply switch module to connect the reel motor and the power supply module, thereby supplying power to the reel motor; when the switch unit is open, the charging and discharging unit discharges to the execution unit, driving the execution unit to control the power supply switch module to continue connecting the reel motor and the power supply module for a certain period of time before disconnecting, thereby delaying the shutdown of the reel motor.

[0009] Furthermore, the switching unit includes a switch S0 and a diode VD11. The first end of the switch S0 is connected to the positive terminal of an external first working voltage source, the second end of the switch S0 is connected to the anode of the diode VD11, and the cathode of the diode VD11 is connected to the charging and discharging unit and the execution unit.

[0010] Furthermore, the charging and discharging unit includes a resistor R30 and a capacitor C20. The resistor R30 and the capacitor C20 are connected in parallel. The positive terminal of the capacitor C20 is connected to the switching unit and the execution unit, and the negative terminal of the capacitor C20 is connected to the negative terminal of the external first working voltage source.

[0011] Furthermore, the execution unit includes a resistor R31, a transistor VT1, a relay K1, and a first protection subunit for protecting the relay K1;

[0012] One end of resistor R31 is connected to the charging / discharging unit and the switching unit, and the other end of resistor R31 is connected to the base of transistor VT1. The collector of transistor VT1 is connected to one end of the coil of relay K1, and the emitter of transistor VT1 is connected to the negative terminal of the external first working voltage source. The other end of the coil of relay K1 is connected to the positive terminal of the external first working voltage source. The normally open contact of relay K1 is connected between the positive terminal of the external second working voltage source and the power supply switching module. The contact of relay K1 is normally open.

[0013] The first protection subunit includes a diode VD10 connected in parallel with the coil of relay K1. The anode of diode VD10 is connected to the collector of transistor VT1, and the cathode of diode VD10 is connected to the positive terminal of an external first working voltage source.

[0014] Furthermore, the power supply switch module includes an arc-extinguishing contactor K2. One end of the coil of the arc-extinguishing contactor K2 is connected to the power supply switch control module, and the other end is connected to the negative terminal of an external second working voltage source. The normally open contact of the arc-extinguishing contactor K2 is connected between the reel motor and the power supply module, and the contact of the arc-extinguishing contactor K2 is normally open.

[0015] Furthermore, the power supply switch module also includes a second protection sub-unit for protecting the arc-extinguishing contactor K2. The second protection sub-unit includes a diode VD12 connected in parallel with the coil of the arc-extinguishing contactor K2. The negative terminal of the diode VD12 is connected to the normally open contact of the relay K1, and the positive terminal of the diode VD12 is connected to the negative terminal of the external second working voltage source.

[0016] Preferably, the voltage input of the external first working voltage source is 24V.

[0017] Preferably, the diode VD11 is of model number IN4007.

[0018] Preferably, the saturation voltage of transistor VT1 is 0.6V, and the model of relay K1 is GSLA-14.

[0019] Preferably, the arc-extinguishing contactor K2 is model LC1D12ED.

[0020] The reel motor control circuit with delayed stop function of this utility model has the following beneficial effects: By extending the stop time of the reel motor through the power supply switch control module, the reel motor is prevented from stopping synchronously with the three-phase dual-speed synchronous motor, thus avoiding the problem of loose cable due to inertia. Furthermore, this technical solution has the advantages of low cost, accurate response, and simple maintenance, saving costs. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0022] Figure 1 This is a structural block diagram of an embodiment of the reel motor control circuit of this utility model;

[0023] Figure 2 This is a circuit diagram of another embodiment of the reel motor control circuit of this utility model. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] See Figure 1 In one embodiment of a reel motor control circuit with a delayed stop function according to the present invention, it includes a power supply switch module 20 and a power supply switch control module 10.

[0026] The power supply switch module 20 is connected between the reel motor 40 and the power supply module 30 that supplies power to the reel motor 40, and is used to control the on / off state of the reel motor 40.

[0027] The power supply switch control module 10, connected to the power supply switch module 20, controls the on / off state of the power supply switch module 20, and indirectly controls the connection between the reel motor 40 and the power supply module 30. The power supply switch control module 10 includes a switch unit 101, a charging / discharging unit 103, and an execution unit 102. The switch unit 101 is connected to an external first working voltage source 50, the charging / discharging unit, and the execution unit. The external first working voltage source 50 supplies power to the charging / discharging unit 103 and the execution unit 102. The execution unit connects the charging / discharging unit and the power supply switch module.

[0028] When the switch unit is closed, the external first working voltage source charges the charging and discharging unit and drives the execution unit to control the power supply switch module to connect the reel motor and the power supply module, thereby supplying power to the reel motor; when the switch unit is open, the charging and discharging unit discharges to the execution unit, driving the execution unit to control the power supply switch module to continue connecting the reel motor and the power supply module for a certain period of time before disconnecting, thereby delaying the shutdown of the reel motor.

[0029] Specifically, when the switch unit 101 is turned on, the external first working voltage source 50 supplies power, the execution unit 102 is turned on, and the power supply switch module 20 connected to the execution unit 102 is turned on. At this time, the reel motor 40 is connected to the power supply module 30, and the reel motor 40 is powered on. At the same time, the charging and discharging unit 103 charges. When the switch unit 101 is turned off, the external first working voltage source 50 stops supplying power, the charging and discharging unit 103 discharges, and the execution unit 102 remains on, controlling the power supply switch module 20 to remain on, so that the reel motor 40 and the power supply module 30 remain connected, and the reel motor 40 remains in the on state. Until the charging and discharging unit 103 exhausts its stored electrical energy, or is insufficient to maintain the execution unit's conduction, the execution unit 102 is turned off, causing the power supply switch module 20 to turn off, thereby disconnecting the reel motor 40 from the power supply module 30, causing the reel motor 40 to lose power and stop. Since the discharge process of the charging and discharging unit 103 can continue for a certain period of time, the effect of delayed shutdown of the reel motor 40 is achieved.

[0030] This embodiment extends the downtime of the reel motor by using a power switch control module, so that after the host computer issues a stop command, the reel motor will not stop synchronously with the three-phase dual-speed synchronous motor, thus avoiding the problem of loose cable due to inertia.

[0031] In one embodiment, the switching unit includes a switch S0 and a diode VD11. The first terminal of switch S0 is connected to the positive terminal of an external first operating voltage source, and the second terminal of switch S0 is connected to the anode of diode VD11. The cathode of diode VD11 is connected to the charging / discharging unit and the execution unit. Switch S0 can be a push-button switch (e.g., IPR3SAD2), a switching transistor, or other types of switch. Diode VD11 prevents reverse current, preventing energy from the charging / discharging unit from flowing to the switching unit. The external first operating voltage source provides the required operating voltage to the power supply switch control module. When switch S0 is closed, the energy from the external first operating voltage source is output to the charging / discharging unit and the execution unit through the cathode of diode VD11. Optionally, diode VD11 is an IN4007.

[0032] In one embodiment, the charging / discharging unit includes a resistor R30 and a capacitor C20. The resistor R30 and the capacitor C20 are connected in parallel. The positive terminal of the capacitor C20 is connected to the switching unit and the execution unit, and the negative terminal of the capacitor C20 is connected to the negative terminal of an external first operating voltage source. The resistance of the resistor R30 is 10kΩ.

[0033] In one embodiment, the execution unit includes a resistor R31, a transistor VT1, a relay K1, and a first protection subunit for protecting the relay K1. One end of the resistor R31 is connected to the charging / discharging unit and the switching unit, and the other end of the resistor R31 is connected to the base of the transistor VT1. The collector of the transistor VT1 is connected to one end of the coil of the relay K1, and the emitter of the transistor VT1 is connected to the negative terminal of an external first working voltage source. The other end of the coil of the relay K1 is connected to the positive terminal of the external first working voltage source. The normally open contact of the relay K1 is connected between the positive terminal of an external second working voltage source and the power supply switching module, and the contact of the relay K1 is normally open. The transistor VT1 is a 9013 transistor, the resistance of the resistor R31 is 10kΩ, and the relay K1 is a GSLA-14.

[0034] The first protection subunit is used to absorb the reverse electromotive force generated during power failure, protecting relay K1 from damage caused by high-voltage spikes. It includes a diode VD10 connected in parallel with the coil of relay K1. The anode of diode VD10 is connected to the collector of transistor VT1, and the cathode of diode VD10 is connected to the positive terminal of an external first operating voltage source. Optionally, diode VD10 is an IN4007.

[0035] In one embodiment, the power supply switch module includes an arc-extinguishing contactor K2. One end of the coil of the arc-extinguishing contactor K2 is connected to the power supply switch control module, and the other end is connected to the negative terminal of an external second working voltage source. The normally open contact of the arc-extinguishing contactor K2 is connected between the reel motor and the power supply module, and the contact of the arc-extinguishing contactor K2 is normally open.

[0036] The external second operating voltage source provides the required operating voltage to the power supply switch module. In this embodiment, the power supply switch module uses an arc-extinguishing contactor, which has an arc-extinguishing function, improving the safety of high-current circuits. The arc-extinguishing contactor K2 is model LC1D12ED. In other embodiments, other models of the arc-extinguishing contactor K2 can be used, depending on the voltage of the external second operating voltage source and the load conditions. Of course, in other embodiments, a contactor without an arc-extinguishing function can also be selected according to actual needs.

[0037] In one embodiment, the power supply switch module further includes a second protection subunit for protecting the arc-extinguishing contactor K2. The second protection subunit includes a diode VD12 connected in parallel with the coil of the arc-extinguishing contactor K2. The negative terminal of diode VD12 is connected to the normally open contact of relay K1, and the positive terminal of diode VD12 is connected to the negative terminal of an external second operating voltage source. The second protection subunit is used to absorb the reverse electromotive force generated during power failure, protecting the arc-extinguishing contactor from damage caused by high-voltage spikes. Optionally, the diode VD12 is an IN4007.

[0038] Figure 2 A specific example of a reel motor control circuit with a delayed stop function is shown. The specific connection relationship of the circuit is as follows: switch S0 is connected to the positive terminal of an external first working voltage source; the anode of diode VD11 is connected to switch S0; the cathode of diode VD11 is connected to one end of resistor R30, the positive terminal of capacitor C20, and one end of resistor R31; the other end of resistor R30 and the negative terminal of capacitor C20 are connected to the negative terminal of the external first working voltage source. The base of transistor VT1 is connected to the other end of resistor R31; the collector of transistor VT1 is connected to the anode of diode VD10 and one end of relay K1; the emitter of transistor VT1 is connected to the negative terminal of the external first working voltage source; the cathode of diode VD10 and the other end of relay K1 are connected to the positive terminal of the external first working voltage source; the normally open contact of relay K1 is connected between the positive terminal of an external second working voltage source and the cathode of diode VD12 and one end of arc-extinguishing contactor K2, and the contact of relay K1 is normally open. The anode of diode VD12 and the other end of arc-extinguishing contactor K2 are connected to the negative terminal of the external second working voltage source; the normally open contact of arc-extinguishing contactor K2 is connected between the power supply module and the reel motor, and the contacts of arc-extinguishing contactor K2 are normally open.

[0039] The circuit works as follows:

[0040] When switch S0 is closed, diode D11 conducts and capacitor C20 is charged; at the same time, transistor VT1 conducts, driving relay K1 to close, so that the coil of arc extinguishing contactor K2 is connected to the external second working voltage source, and the normally open contact of arc extinguishing contactor K2 is energized, so that the reel motor is connected to the power supply module and the reel motor is powered on.

[0041] When switch S0 is open, capacitor C20 discharges, keeping transistor VT1 conducting, which in turn keeps relay K1 and arc-extinguishing contactor K2 closed, keeping the reel motor running. When capacitor C20 is depleted or insufficient to keep the actuator conducting, the voltage provided by capacitor C20 falls below the cutoff voltage of transistor VT1. At this point, relay K1 and arc-extinguishing contactor K2 are disconnected, thus disconnecting the reel motor from the power supply module and shutting down the reel motor.

[0042] In this embodiment, the voltage input of the external first working voltage source is 24V. In other embodiments, the voltage input of the external first working voltage source can also take other values, such as 36V, depending on the required delay time and the working voltage of the electronic components.

[0043] In this embodiment, the voltage input of the external second working voltage source is 48V. In other embodiments, the voltage input of the external second working voltage source can also take other values, such as 36V, depending on the working voltage of the arc extinguishing contactor K2.

[0044] In this embodiment, the saturation voltage of transistor VT1 is 0.6V, and the power consumption of transistor VT1 is negligible. Therefore, the delay time is: t=RC*ln[(V1-V0) / (V1-Vt)].

[0045] V0 is the voltage value input from the external first working voltage source, which is also the initial voltage value on capacitor C20;

[0046] V1 is the final voltage value that capacitor C20 can be charged to or discharged to;

[0047] Vt is the voltage across capacitor C20 at time t;

[0048] RC is the RC time constant of the charging and discharging unit.

[0049] Let V0 = 24V; V1 = 0; Vt = 0.6V (equal to the saturation operating voltage of transistor VT1; the transistor turns off when the voltage is below this value); then the delay time is approximately: t = 1 * ln(24 / 0.6) = 3.69s. It is understandable that the delay stop time of this reel motor control circuit can be adjusted by adjusting the above parameters or selecting other types of components.

[0050] The technical solution of this embodiment has the advantages of low cost, accurate response, and simple maintenance, thus saving costs.

[0051] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A reel motor control circuit with a delayed stop function, characterized in that, Includes a power supply switch module and a power supply switch control module; The power supply switch module is connected between the reel motor and the power supply module that supplies power to the reel motor; The power supply switch control module includes a switch unit, a charging / discharging unit, and an execution unit; The switching unit is connected to the charging and discharging unit, the execution unit, and an external first working voltage source; the execution unit is connected to the charging and discharging unit and the power supply switching module. When the switch unit is closed, the external first working voltage source charges the charging and discharging unit and drives the execution unit to control the power supply switch module to connect the reel motor and the power supply module, thereby supplying power to the reel motor; when the switch unit is open, the charging and discharging unit discharges to the execution unit, driving the execution unit to control the power supply switch module to continue connecting the reel motor and the power supply module for a certain period of time before disconnecting, thereby delaying the shutdown of the reel motor.

2. The reel motor control circuit with delayed stop function according to claim 1, characterized in that, The switching unit includes a switch S0 and a diode VD11. The first end of the switch S0 is connected to the positive terminal of an external first working voltage source, and the second end of the switch S0 is connected to the anode of the diode VD11. The cathode of the diode VD11 is connected to the charging and discharging unit and the execution unit.

3. The reel motor control circuit with delayed stop function according to claim 1, characterized in that, The charging and discharging unit includes a resistor R30 and a capacitor C20. The resistor R30 and the capacitor C20 are connected in parallel. The positive terminal of the capacitor C20 is connected to the switching unit and the execution unit, and the negative terminal of the capacitor C20 is connected to the negative terminal of the external first working voltage source.

4. The reel motor control circuit with delayed stop function according to claim 1, characterized in that, The execution unit includes a resistor R31, a transistor VT1, a relay K1, and a first protection subunit for protecting the relay K1. One end of resistor R31 is connected to the charging / discharging unit and the switching unit, and the other end of resistor R31 is connected to the base of transistor VT1. The collector of transistor VT1 is connected to one end of the coil of relay K1, and the emitter of transistor VT1 is connected to the negative terminal of the external first working voltage source. The other end of the coil of relay K1 is connected to the positive terminal of the external first working voltage source. The normally open contact of relay K1 is connected between the positive terminal of the external second working voltage source and the power supply switching module. The contact of relay K1 is normally open. The first protection subunit includes a diode VD10 connected in parallel with the coil of relay K1. The anode of diode VD10 is connected to the collector of transistor VT1, and the cathode of diode VD10 is connected to the positive terminal of an external first working voltage source.

5. The reel motor control circuit with delayed stop function according to claim 1, characterized in that, The power supply switch module includes an arc-extinguishing contactor K2. One end of the coil of the arc-extinguishing contactor K2 is connected to the power supply switch control module, and the other end is connected to the negative terminal of an external second working voltage source. The normally open contact of the arc-extinguishing contactor K2 is connected between the reel motor and the power supply module, and the contact of the arc-extinguishing contactor K2 is normally open.

6. The reel motor control circuit with delayed stop function according to claim 5, characterized in that, The power supply switch module also includes a second protection sub-unit for protecting the arc-extinguishing contactor K2. The second protection sub-unit includes a diode VD12 connected in parallel with the coil of the arc-extinguishing contactor K2. The negative terminal of the diode VD12 is connected to the normally open contact of the relay K1, and the positive terminal of the diode VD12 is connected to the negative terminal of the external second working voltage source.

7. The reel motor control circuit with delayed stop function according to claim 1, characterized in that, The voltage input from the external first working voltage source is 24V.

8. The reel motor control circuit with delayed stop function according to claim 2, characterized in that, The diode VD11 is model number IN4007.

9. The reel motor control circuit with delayed stop function according to claim 4, characterized in that, The saturation voltage of transistor VT1 is 0.6V, and the model of relay K1 is GSLA-14.

10. The reel motor control circuit with delayed stop function according to claim 5, characterized in that, The arc-extinguishing contactor K2 has the model number LC1D12ED.

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