A double-coil contactor with electronic auxiliary contact and a control method thereof

Abstract

The application discloses a double-coil contactor with an electronic auxiliary contact and a control method thereof, which comprises a contactor and an electronic auxiliary contact; the contactor is internally provided with a moving contact rod and a stationary contact point, the moving contact rod is controlled through a first coil and a second coil, the electronic auxiliary contact is provided with a first contact point, a second contact point, a contactor positive contact point, a contactor negative contact point and a coil control loop point, the first contact point and the second contact point are respectively connected to one end of the first coil and the second coil, the other end of the first coil and the second coil is connected to the coil control loop point in parallel, and the positive and negative poles of the contactor are connected with the contactor positive contact point and the contactor negative contact point respectively. The double-coil contactor coil is controlled to work, mainly through a delay circuit to control the retention coil to be connected, and the double-coil switching is realized. When starting, the starting coil works, and after a period of time delayed by the delay circuit in the electronic auxiliary point, the retention coil is connected, the overall resistance of the coil is suddenly increased, the current is rapidly reduced, the coil continues to work with low power consumption, and the low-power-consumption retention requirement is met.

Description

Technical Field

[0001] This invention relates to a dual-coil contactor with electronic auxiliary contacts and its control method. Background Technology

[0002] A dual-coil controlled contactor mainly consists of an electromagnetic part, a drive part, a contact part, and an outer casing. The electromagnetic part of a dual-coil contactor includes a starting coil and a holding coil, which have the advantages of high-power starting and low-power holding. When the product is working, the starting coil and the holding coil need to be switched. The mechanical auxiliary contacts commonly used to control the switching of dual coils are often prone to failure due to mechanical fatigue, and have many failure modes and a high failure rate, making it difficult to meet the reliability requirements of 100,000 cycles for civil aircraft. Once the coil cannot switch normally, it may cause the product to malfunction, leading to the failure of the entire machine and affecting flight safety.

[0003] Currently, many contactors typically use reed-type mechanical auxiliary contacts to switch between dual coils. While this achieves functional switching between the two coils, it cannot avoid the erosion of the contacts caused by high coil current, and the contact reeds are prone to deformation and breakage. A new control method, namely "electronic circuit control," can be adopted to improve the lifespan of the coil auxiliary contacts. Summary of the Invention

[0004] The purpose of this invention is to address the problem that mechanical auxiliary contacts can cause contact erosion by providing a contactor that uses electronic auxiliary contacts for dual coil control.

[0005] The technical solution of the present invention: A dual-coil contactor with electronic auxiliary contacts and its control method are disclosed. The contactor includes a contactor and electronic auxiliary contacts. The contactor has a moving contact rod and a stationary contact. The moving contact rod is controlled by a first coil and a second coil. The electronic auxiliary contacts have a first contact, a second contact, a positive contact, a negative contact, and a coil control circuit point. The first and second contacts are respectively connected to one end of the first and second coils, and the other ends of the first and second coils are connected in parallel to the coil control circuit point. The positive and negative terminals of the contactor are connected to the positive and negative contacts, respectively. This method controls the operation of the dual-coil contactor coils, primarily by controlling the connection of the holding coil through a delay circuit to achieve dual-coil switching. Upon startup, the starting coil operates, and after a delay period in the electronic auxiliary contacts, the holding coil is connected. Instantly, the overall resistance of the coil increases, and the current rapidly decreases, allowing the coil to continue operating with lower power consumption, meeting the low-power holding requirement.

[0006] The connection and disconnection between the first and second contacts and the coil control circuit point are controlled by an auxiliary relay.

[0007] The first coil and the second coil are the starting coil and the holding coil, respectively.

[0008] The contactor is also equipped with indicator lights to show the on / off status of the first coil and the second coil, respectively.

[0009] The magnetic circuits of the first coil and the second coil are connected in series.

[0010] A control method for a dual-coil contactor with electronic auxiliary contacts, comprising the following steps: S1, Start; S2. When the second coil is energized, it drives the moving contact rod to move, causing the moving contact rod to make contact with the stationary contact.

[0011] S3. After a certain delay, the second coil is de-energized, and the first coil is energized to keep the moving contact rod and the stationary contact in contact.

[0012] The beneficial effects of this invention are: the failure rate of the components themselves is extremely low, and the lifespan is long, with the lifespan and durability cycles far exceeding the required index of 100,000 cycles; the shape of the auxiliary contacts is not fixed, the principle of the electronic auxiliary contact circuit is fixed, but the shape can be changed and the layout can be adjusted according to the actual situation of the product, and the components can be round or square, long or short, and can be arranged on one or both sides to meet any installation method. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the control principle of the present invention; In the diagram: 1-Contactor, 11-Moving contact rod, 12-First coil, 13-Second coil, 2-Electronic auxiliary contact, 21-First contact, 22-Second contact, 23-Contactor positive contact, 24-Contactor negative contact, 25-Coil control circuit point, 26-Auxiliary relay. Detailed Implementation

[0014] like Figure 1 As shown, the present invention provides a novel method for switching dual-coil contactors, using electronic auxiliary contacts instead of traditional mechanical auxiliary contacts to control the switching of dual coils. The installation method is supported by four support columns and fixed with screws.

[0015] The electronic auxiliary point is connected to the dual coil and the circuit board by wires. The voltage signal is transmitted to the electronic auxiliary point through the plug on the circuit board for control, and then transmitted to the dual coil.

[0016] When the given coil voltage is 28V, the initial state is that the electronic auxiliary contact is activated, and the starting coil K1 generates electromagnetic force. This electromagnetic force drives the core rod and iron core to move, and then the iron core drives the main contact assembly to move upward, thus activating the main contacts. After a certain delay by the electronic auxiliary contact delay circuit, the electronic auxiliary contact circuit maintains the connection of the coil K2 (see circuit principle). Figure 2By connecting the starting coil K1 and the holding coil K2 in series, the total resistance of the coils is increased, the coil current is reduced, the power consumption of the product is reduced, and the effect of high-power starting and low-power holding is achieved.

[0017] Based on the preliminary test of the 204-1121-1 three-phase AC contactor, the electronic auxiliary contact has a lifespan of up to 200,000 cycles without damage, far exceeding the required 100,000 cycles. Although the contactor using electronic auxiliary contacts to control dual-coil switching uses more electronic components than the mechanical auxiliary contact control coil switching product, its reliability is higher. This is because although electronic auxiliary contacts have more components, each component is basically a basic component with an extremely low failure rate. In contrast, mechanical auxiliary contacts consist only of springs and contacts, but their failure rate is much higher than the sum of the failure rates of electronic components.

Claims

1. A dual-coil contactor with electronic auxiliary contacts, comprising a contactor (1) and electronic auxiliary contacts (2), characterized in that: The contactor (1) is provided with a moving contact rod (11) and a stationary contact (14). The moving contact rod (11) is controlled by a first coil (12) and a second coil (13). The electronic auxiliary contact (2) is provided with a first contact (21), a second contact (22), a contactor positive contact (23), a contactor negative contact (24), and a coil control circuit point (25). The first contact (21) and the second contact (22) are respectively connected to one end of the first coil (12) and the second coil (13). The other end of the first coil (12) and the second coil (13) are connected in parallel to the coil control circuit point (25). The positive and negative poles of the contactor (1) are respectively connected to the contactor positive contact (23) and the contactor negative contact (24).

2. The dual-coil contactor with electronically auxiliary contacts as described in claim 1, characterized in that: The connection and disconnection between the first contact (21) and the second contact (22) and the coil control circuit point (25) are controlled by the auxiliary relay (26).

3. The dual-coil contactor with electronically auxiliary contacts as described in claim 1, characterized in that: The first coil (12) and the second coil (13) are the starting coil and the holding coil, respectively.

4. The dual-coil contactor with electronically auxiliary contacts as described in claim 1, characterized in that: The contactor (1) is also equipped with indicator lights to show the on / off status of the first coil (12) and the second coil (13).

5. The dual-coil contactor with electronically auxiliary contacts as described in claim 1, characterized in that: The first coil (12) and the second coil (13) are connected in series in terms of magnetic circuit.

6. A control method for a dual-coil contactor with electronically auxiliary contacts as described in claims 1-5, comprising the following steps: S1, Start; S2. The second coil (13) is energized, which drives the moving contact rod (11) to move, so that the moving contact rod (11) contacts the stationary contact (14). S3. After a certain delay, the second coil (13) is de-energized and the first coil (12) is energized, causing the moving contact rod (11) and the stationary contact (14) to remain in contact.

Images