Fusing safety device of motor controller

Abstract

The utility model relates to a circuit board and a motor structure. A fusing safety device of a motor controller comprises a PCBA board support arranged in a shell assembly of the motor controller, the PCBA board support is connected with a power input terminal and a PCBA wiring terminal, the power input terminal is connected with the PCBA wiring terminal through an electrode plate, and the PCBA wiring terminal is connected with the PCBA board support. Two ends of the electrode plate are respectively welded with the power supply input terminal and the PCBA wiring terminal through a hot melting material, an elastic structure is arranged below the electrode plate, the elastic structure comprises an elastic body accommodating cavity, the elastic body accommodating cavity is positioned below the electrode plate, a compressed elastic element is arranged in the elastic accommodating cavity, and one end of the elastic element is propped against the electrode plate. The utility model provides the fusing safety device of the motor controller, which is good in reliability, simple in structure and capable of realizing quick circuit breaking and protecting the circuit from being damaged; the technical problem that the reliability is not enough when a fuse structure is used for circuit breaking in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to a circuit board and a motor structure, in particular to a fuse safety device of a motor controller. Background Art

[0002] During the operation of automotive cooling fan motor controllers, current overloads or short circuits can damage the circuits, even leading to serious consequences such as fires, seriously endangering personal and vehicle safety. To prevent the circuits from continuing to operate under abnormal conditions and protect components from damage caused by overcurrent, safety devices such as fuses are often required. Summary of the Invention

[0003] The utility model provides a fuse safety device for a motor controller with good reliability, simple structure, and the ability to quickly disconnect circuits and protect circuits from damage; it solves the technical problem in the prior art of using fuse structures for disconnection but having insufficient reliability.

[0004] The above-mentioned technical problem of the present invention is solved by the following technical solution: a fuse safety device for a motor controller, comprising a PCBA board bracket positioned within a motor controller housing assembly, the PCBA board bracket being connected to a power input terminal and a PCBA terminal block, an electrode sheet being connected between the power input terminal and the PCBA terminal block, the ends of the electrode sheet being welded to the power input terminal and the PCBA terminal block respectively using a hot melt material, and an elastic structure being provided below the electrode sheet. The elastic structure comprises an elastic body receiving cavity positioned below the electrode sheet, the elastic body receiving cavity being provided within a compressed elastic element, one end of the elastic element abutting against the electrode sheet. The device utilizes an electrode sheet welded to a circuit using a fusible material such as a tin-based alloy. When the circuit is overloaded, the welding material at both ends of the electrode sheet rapidly melts due to overheating, causing the electrode sheet to disconnect the circuit. After the circuit is disconnected, the elastic element pushes the electrode sheet upward, preventing it from falling back onto the circuit, thereby ensuring reliable disconnection. The overall device is simple in structure and low in cost.

[0005] Preferably, the PCBA board bracket includes a copper busbar bracket and a plastic coating layer coated on the outside of the copper busbar bracket. The plastic coating layer is integrally formed with an elastic member accommodating cavity, a guide positioning column is formed in the elastic member accommodating cavity, a spring is sleeved on the guide positioning column, one end of the spring abuts against the bottom of the elastic member accommodating cavity, and the other end of the spring abuts against the electrode sheet. This ensures that the circuit is always in a normally open state after the fuse is blown, and the electrode sheet will not fall back, ensuring that the circuit is permanently and reliably disconnected. This improves the safety of the circuit. After the copper busbar bracket is formed, an elastic member accommodating cavity is also formed while the copper busbar bracket is wrapped by injection molding. The process is simple and the operation is convenient.

[0006] Preferably, a positioning hole is provided in the center of the electrode sheet, through which a guide positioning post extends, and a welding hole is provided at each end of the electrode sheet. The positioning post structure guides the electrode sheet after it is melted, preventing it from deviating and achieving rapid circuit breaking.

[0007] Preferably, the copper busbar support comprises two layers of copper busbars, one above the other, with a plastic insulation layer between them. The two layers of copper busbars and the plastic spacer form a sandwich structure. Its low vertical height allows for connection to multiple connection terminals and three-phase connectors for multiple circuits, effectively dissipating heat.

[0008] Preferably, the power input terminal and the PCBA terminal are connected to the PCBA bracket by injection molding, which has a simple structure.

[0009] Preferably, a gap is provided above the electrode sheet, and the elastic movement stroke of the elastic element is greater than the gap distance, so as to ensure that the electrode sheet will not fall down after the connection between the two ends of the electrode sheet is melted, thereby ensuring that the circuit is permanently and reliably disconnected.

[0010] Preferably, the motor controller housing assembly includes a motor housing assembly and a back cover assembly. After the hot-melt materials at both ends of the electrode sheet are melted, the electrode sheet is abutted against the back cover assembly by the elastic element.

[0011] Preferably, the hot-melt material is made of tin-based alloy.

[0012] Therefore, the fuse safety device for a motor controller of the present invention has the following advantages: the circuit is disconnected by thermally fusing the two ends of the electrode sheet, and the elastic element keeps the electrode sheet in a high position at all times, preventing it from reconnecting to the terminal, thus ensuring the stability of the circuit. It also has a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is an exploded perspective view of a fuse safety device of a motor controller.

[0014] Figure 2 yes Figure 1 Enlarged cross-sectional view at point A in the middle.

[0015] Figure 3 yes Figure 1 Cross-sectional view with rear-end components removed at point A.

[0016] Figure 4 yes Figure 3 Exploded diagram. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0018] Example:

[0019] like Figure 1 and 2 As shown in Figures 3 and 4, a fuse safety device for a motor controller includes a motor housing assembly 1 and a back cover assembly 2 that are interlocked. The motor housing assembly 1 and the back cover assembly 2 form a accommodating cavity, in which a PCBA board 4 and a PCBA board bracket 3 are installed. The PCBA board bracket 3 includes a copper busbar bracket and a plastic coating layer coated on the outside of the copper busbar bracket. The plastic coating layer is formed by injection molding to form a wrapping layer on the outside of the copper busbar bracket. When the plastic coating layer is molded, an elastic component accommodating cavity 5 is also integrally molded. At the same time, when the plastic coating layer is molded by the injection molding process, various connecting terminals are also fixed to the PCBA board bracket 3, such as the power input terminal 8, the PCBA terminal 7, and the grounding terminal. The elastic component accommodating cavity 5 is located between the power input terminal 8 and the PCBA terminal 7. A guide positioning column 9 is molded in the center of the elastic component accommodating cavity 5, and a compression spring 11 is sleeved on the guide positioning column 9.

[0020] The power input terminals 8 and the PCBA terminals 7 are connected via electrode sheet 6. This rectangular metal sheet has a positioning hole 12 at its center. A welding hole 13 is formed at each end of the motor sheet 6. The ends of the electrode sheet 6 are welded to the power input terminals 8 and PCBA terminals 7, respectively, using a tin-based alloy 10. The electrode sheet 6 is located above the elastic accommodation cavity 5.

[0021] The guide positioning post 9 passes through the positioning hole 12 in the center of the electrode sheet. One end of the compression spring 11 abuts against the bottom of the elastic member accommodating cavity 5 , and the other end of the compression spring 11 abuts against the bottom of the electrode sheet 6 .

[0022] The compressed state of compression spring 11 maintains the connection between electrode sheet 6 and the circuit. When the molten solder at both ends of electrode sheet 6 melts, the rebound force of compression spring 11 quickly disconnects the circuit, ensuring that the current is interrupted in a timely manner. At the same time, the remaining rebound force of compression spring 11 firmly presses electrode sheet 6 against rear cover assembly 2, ensuring that the circuit is permanently and reliably disconnected.

[0023] The specific embodiments described herein are merely illustrative of the concepts of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A fuse safety device for a motor controller, comprising a PCBA board bracket disposed within a motor controller housing assembly, characterized in that: The PCBA board bracket is connected to the power input terminal and the PCBA terminal. The power input terminal and the PCBA terminal are connected by an electrode sheet. The two ends of the electrode sheet are respectively welded to the power input terminal and the PCBA terminal by hot-melt material. An elastic structure is provided under the electrode sheet. The elastic structure includes an elastic body accommodating cavity. The elastic body accommodating cavity is located below the electrode sheet. A compressed elastic element is provided in the elastic accommodating cavity. One end of the elastic element abuts against the electrode sheet.

2. The fuse safety device of a motor controller according to claim 1, characterized in that: The PCBA board bracket includes a copper busbar bracket and a plastic coating wrapped around the copper busbar bracket. The plastic coating is integrally formed with an elastic member accommodating cavity. A guide positioning column is formed in the elastic member accommodating cavity. A spring is sleeved on the guide positioning column. One end of the spring abuts against the bottom of the elastic member accommodating cavity, and the other end of the spring abuts against the electrode sheet.

3. The fuse safety device of a motor controller according to claim 2, characterized in that: A positioning hole is provided at the center of the electrode sheet, and a guide positioning column passes through the positioning hole. A welding hole is provided at each end of the electrode sheet.

4. The fuse safety device of a motor controller according to claim 2, characterized in that: The copper busbar support comprises an upper and lower layer of copper busbars, with a plastic insulating layer provided between the two layers of copper busbars.

5. A fuse safety device for a motor controller according to any one of claims 1 to 4, characterized in that: The power input terminal and the PCBA terminal are connected to the PCBA bracket through injection molding.

6. A fuse safety device for a motor controller according to any one of claims 1 to 4, characterized in that: A gap is provided above the electrode sheet, and the elastic movement stroke of the elastic element is greater than the gap distance.

7. A fuse safety device for a motor controller according to any one of claims 1 to 4, characterized in that: The motor controller housing assembly comprises a motor housing assembly and a rear cover assembly. After the hot-melt materials at both ends of the electrode sheet are melted, the electrode sheet is abutted against the rear cover assembly by the elastic element.

8. A fuse safety device for a motor controller according to any one of claims 1 to 4, characterized in that: The hot-melt material is made of tin-based alloy.

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