Y-motor starting time sequence control circuit

Abstract

The utility model belongs to the technical field of motor starting application, and particularly discloses a Y-motor starting time sequence control circuit. Comprising an MCU control unit, a BCD decoding circuit, a DPDT relay, a key detection circuit, an AC / DC circuit, a voltage detection circuit, a first silicon controlled switching circuit, a second silicon controlled switching circuit, a third silicon controlled switching circuit, a first contactor KM1, a second contactor KM2, a third contactor KM3, a stop key, a start key and a Y-switching delay digital switch. The beneficial effects of the Y-motor starting time sequence control circuit are that the use number of parts, such as a timer and a relay, is reduced, and the installation space is reduced; the wiring is simple, the labor cost is reduced, the number of connecting wires is reduced, and the installation efficiency is improved; the device is suitable for use scenes of motors of more models, and can meet different use scenes due to adjustable external timing parameters; and the switching time is self-adaptive, so that the device can be suitable for more types of contactors.

Description

Technical Field

[0001] The utility model belongs to the application field of motor starting technology, and specifically relates to a Y-△ motor starting timing control circuit, which is applied to automatic switching control between a Y-type connection and a △-type connection during the starting process of a Y-△ type motor. Background Art

[0002] At present, the delayed switching of Y-△ electric starting is basically achieved in the market by using components such as time counters and relays, and there are no components / devices with integrated functions to control the timing of Y-△ electric starting.

[0003] The disadvantages of using time counters, relays and other components to achieve delayed switching of Y-△ electric starting are as follows: 1. It uses many components and the wiring is complicated; 2. There is no protection mechanism during the Y-△ switching process. The normal operation is to close the Y-type energized contactor and use a timer to set a certain waiting time before switching to the △-type energized contactor. In this way, there is a possibility that the Y-type contactor will fail and cause the contactor contacts to not release or release slowly, which will cause the Y-type and △-type contactors to be energized at the same time, causing a short circuit between the power supplies and damage to the electrical equipment; 3. The existing products have strong AC current flowing through the human-computer interaction button part, which makes the buttons have the risk of leakage and electric shock.

[0004] Therefore, based on the above problems, the utility model provides a Y-△ motor starting timing control circuit. Utility Model Content

[0005] Purpose of the utility model: The purpose of the utility model is to provide a Y-△ motor starting timing control circuit to solve the problem of complex wiring of the existing traditional Y-△ motor in the background technology, reduce the difficulty of wiring, and at the same time save labor costs and reduce the risk of leakage and electric shock of human-machine buttons.

[0006] Technical solution: The utility model is a Y-△ motor starting timing control circuit, including an MCU control unit, and a BCD decoding circuit, a DPDT relay, a key detection circuit, an AC / DC circuit, a voltage detection circuit, a first thyristor switch circuit, a second thyristor switch circuit and a third thyristor switch circuit respectively connected to the MCU control unit, and a first contactor KM1, a second contactor KM2, and a third contactor KM3 respectively connected to the first thyristor switch circuit, the second thyristor switch circuit and the third thyristor switch circuit, and a stop key and a start key respectively connected to the key detection circuit, and a Y-△ switching delay digital switch connected to the BCD decoding circuit.

[0007] In the technical solution, the Y-△ motor start timing control circuit also includes a flashing switch key connected to the key detection circuit; wherein, after receiving the alarm signal, the first contactor KM1 is closed, the second contactor KM2 and the third contactor KM3 are in AC contact, and the output switch state of the DPDT relay will be continuously switched between normally closed and normally open. At this time, the MCU control unit sends an alarm FR flashing switch signal to the flashing switch key through the key detection circuit, and the flashing switch key flashes to warn.

[0008] In the technical solution, the second contactor KM2 is △-shaped; the third contactor KM3 is Y-shaped.

[0009] Compared with the prior art, the beneficial effects of a Y-△ motor starting timing control circuit of the utility model are: 1. Reducing the number of components used, such as timers and relays, and reducing installation space; 2. Simple wiring. The original wiring relationship is complicated, and generally requires experienced personnel to install and debug, reducing labor costs, while also reducing the number of connections and improving installation efficiency; 3. It can adapt to more types of motor usage scenarios, and the adjustable external timing parameters can meet different usage scenarios; 4. It has the on-off detection function of the third contactor KM3 AC contactor, which can solve the power supply short circuit safety hazard caused by the third contactor KM3 not being completely disconnected during the switching process between the third contactor KM3 and the second contactor KM2. At the same time, the switching time can be adaptive, which can adapt to the use of more types of contactors. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 It is a structural schematic diagram of a Y-△ motor starting timing control circuit of the utility model;

[0012] Figure 2 This is an electrical schematic diagram of a Y-△ motor starting timing control circuit of the utility model;

[0013] Figure 3 It is the electrical schematic diagram of the MCU control unit;

[0014] Figure 4 It is the electrical schematic diagram of the BCD decoding circuit;

[0015] Figure 5 This is the electrical schematic diagram of the DPDT relay;

[0016] Figure 6 is the electrical schematic diagram of the voltage detection circuit;

[0017] Figure 7 It is the electrical schematic diagram of the AC / DC circuit;

[0018] Figure 8 It is the electrical schematic diagram of the signal interface of the first contactor KM1, the second contactor KM2, the third contactor KM3, the Y-△ switching delay digital switch, etc.;

[0019] Fig. 9 It is the electrical schematic diagram of the key detection circuit;

[0020] Fig.10 It is an electrical schematic diagram of a first thyristor switch circuit, a second thyristor switch circuit, and a third thyristor switch circuit;

[0021] Among them, the serial numbers in the figure are as follows: 10-MCU control unit, 11-BCD decoding circuit, 12-DPDT relay, 13-key detection circuit, 14-AC / DC circuit, 15-voltage detection circuit, 16-first thyristor switch circuit, 17-second thyristor switch circuit, 18-third thyristor switch circuit, 19-Y-△ switching delay digital switch, 20-flashing on / off key, 21-stop key, 22-start key, 23-first contactor KM1, 24-second contactor KM2, 25-third contactor KM3. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be noted that the terms "top", "bottom", "side"

[0024] , "the other side", "the front", "the back", "the middle", "the inside", "the top", "

[0025] The orientation or positional relationship indicated by "first", "second", "third" and the like are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Embodiment 1

[0027] like Figure 1 and Figure 2 The Y-△ motor starting timing control circuit shown includes an MCU control unit 10, and a BCD decoding circuit 11, a DPDT relay 12, a key detection circuit 13, an AC / DC circuit 14, a voltage detection circuit 15, a first thyristor switch circuit 16, a second thyristor switch circuit 17 and a third thyristor switch circuit 18 respectively connected to the MCU control unit 10, and a first contactor KM123, a second contactor KM224, and a third contactor KM325 respectively connected to the first thyristor switch circuit 16, the second thyristor switch circuit 17, and the third thyristor switch circuit 18, and a stop key 21 and a start key 22 respectively connected to the key detection circuit 13, and a Y-△ switching delay digital switch 19 connected to the BCD decoding circuit 11.

[0028] Embodiment 2

[0029] On the basis of the first embodiment, the Y-△ motor start timing control circuit further includes a flashing switch key 20 connected to the key detection circuit 13;

[0030] Among them, after receiving the alarm signal, the first contactor KM123 is closed, the second contactor KM224 and the third contactor KM325 are in AC contact, and the output switch state of the DPDT relay 12 will be continuously switched between normally closed and normally open. At this time, the MCU control unit 10 sends an alarm FR flashing switch signal to the flashing switch key 20 through the key detection circuit 13, and the flashing switch key 20 flashes to warn.

[0031] In addition, the preferred second contactor KM224 is a △ type; the third contactor KM325 is a Y type.

[0032] The structural principle or working principle of the Y-△ motor starting timing control circuit of this structure:

[0033] Please review Figure 1 and Figure 2 :

[0034] According to the interface definition of the product, the AC / DC circuit 14, the flashing switch key 20, the stop key 21, the start key 22, etc. are connected to the MCU control unit 10 accordingly. After pressing the start key 22, the MCU control unit 10 will simultaneously open the control coils of the first contactor KM123 and the third contactor KM325 AC contact, so that the first contactor KM123 and the third contactor KM325 (Y-type) AC contactor remain turned on to provide working voltage for the motor M; then, according to the Y-△ delay time set by the user, the third contactor KM325 (Y-type) AC contactor is closed, and then through the voltage detection function of the circuit itself, after ensuring that the third contactor KM325 (Y-type) AC contactor has been turned off, the second contactor KM224 (△-type) AC contactor is immediately opened to provide the motor M with a △-type power supply mode to ensure that the motor M continues to work normally.

[0035] The output switch state of DPDT relay 12 remains switched to the normally open port, sending out a switch signal for normal operation. After receiving the stop key signal, the first contactor KM123, the second contactor KM224, and the third contactor KM325 AC contact are closed, and the output switch state of DPDT relay 12 remains switched to the normally closed port, sending out a switch signal to stop working.

[0036] After receiving the alarm signal, the first contactor KM123 is closed, the second contactor KM224 and the third contactor KM325 are in AC contact, and the output switch state of the DPDT relay 12 is continuously switched between normally closed and normally open, sending a flashing switch signal (FR alarm signal) for alarm to the flashing switch key 20.

[0037] Figures 3 to 10 It is the electrical schematic diagram of the constituent unit or circuit of the Y-△ motor starting timing control circuit of this structure.

[0038] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0039] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A Y-△ motor starting timing control circuit, characterized in that: The invention comprises an MCU control unit (10), a BCD decoding circuit (11), a DPDT relay (12), a key detection circuit (13), an AC / DC circuit (14), a voltage detection circuit (15), a first thyristor switch circuit (16), a second thyristor switch circuit (17) and a third thyristor switch circuit (18) respectively connected to the MCU control unit (10), a first contactor KM1 (23), a second contactor KM2 (24) and a third contactor KM3 (25) respectively connected to the first thyristor switch circuit (16), the second thyristor switch circuit (17) and the third thyristor switch circuit (18), a stop key (21) and a start key (22) respectively connected to the key detection circuit (13), and a Y-△ switching delay digital switch (19) connected to the BCD decoding circuit (11).

2. A Y-△ motor starting timing control circuit according to claim 1, characterized in that: The Y-△ motor start timing control circuit also includes a flashing switch key (20) connected to the key detection circuit (13); When an alarm signal is received, the first contactor KM1 (23) is closed, the second contactor KM2 (24) and the third contactor KM3 (25) are in AC contact, and the output switch state of the DPDT relay (12) is continuously switched between normally closed and normally open. At this time, the MCU control unit (10) sends an alarm FR flashing switch signal to the flashing switch key (20) through the key detection circuit (13), and the flashing switch key (20) flashes to warn.

3. The Y-△ motor starting timing control circuit according to claim 1 is characterized in that: The second contactor KM2 (24) is of △ type; the third contactor KM3 (25) is of Y type.

Images