Secondary protection structure based on ec motor driver and an ec motor

Abstract

The utility model discloses a secondary protection structure and a kind of EC motor based on EC motor driver, by increasing inner boss, outer boss and the sheath being arranged between driver housing and circuit board, through the locating pin and fixed buckle of sheath bottom, accurate fixing can be quickly found and positioned;After fixed, sheath and circuit board form rectangular cavity, connector on circuit board and other devices are physically separated, possible rainwater, dust, other conductive material outside can be isolated in rectangular cavity, will not flow into driver cavity inside, reduce circuit board life, even direct short circuit leads to circuit board damage, form the internal protection of circuit board;And the rectangular hole in the middle of the rectangular cavity and inner boss corresponds, to ensure that construction personnel can connect external power line and control line to the connector of circuit board;On the premise of not affecting wiring, by outer boss and driver upper cover sealing installation, complete outer protection, with very strong practicality and extensive applicability.

Description

Technical Field

[0001] This utility model relates to a secondary protection structure, specifically a secondary protection structure based on an EC motor driver, and belongs to the field of motor driver design technology. Background Technology

[0002] EC motors are commutator motors that achieve commutation through a built-in driver, making them a type of integrated motor and driver unit and a relatively new type of motor. These motors are typically used in harsh operating conditions, such as outdoor environments exposed to rain or dust. Because the driver and motor are integrated, they must be adaptable to various application conditions. The internal circuit board of the driver is a precision component; if impurities enter, it will reduce the lifespan of the circuit board and may even cause a short circuit, leading to its damage.

[0003] The existing EC motor consists of two parts: the motor and the driver. The driver is connected to and controls the motor via the motor power cable.

[0004] The driver consists of a circuit board, driver housing, wiring cover, matching seals, and fixing screws. The circuit board is mounted inside the driver housing, and the wiring connector on the circuit board is located below the wiring port on the driver housing, facilitating the connection of external power and control cables during installation and commissioning. The overall protection level meets the IP65 technical requirements.

[0005] However, the wiring connector area on the circuit board is not separated from other areas through structural design, which poses the following risks during actual use: 1. During construction, cut copper wires may accidentally enter the driver. If not cleaned in time, they will remain inside the driver, posing a risk of short circuit on the circuit board. 2. During the construction process, after the wiring is completed, the fastening screws on the wiring cover are not tightened, which results in the wiring cover and the driver housing not achieving the proper sealing effect. After running for a period of time, rainwater, sand and other foreign objects will enter and eventually cover the circuit board, which may reduce the life of the circuit board, etc.

[0006] Therefore, the design of the secondary protection structure between the motor driver housing and the circuit board has become a key technical challenge, as it directly affects the performance and service life of the EC motor driver. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a secondary protection structure based on an EC motor driver.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: The secondary protection structure based on the EC motor driver includes an open slot in the driver housing, with an outer boss and an inner boss at the top and bottom of the open slot, respectively. The outer protrusion is used to secure the driver cover; The inner boss is used to secure the sheath. The bottom of the sheath is fitted onto the circuit board inside the driver housing, and the internal cavity is used to connect the external power line and control line to the circuit board through the side hole of the outer boss.

[0009] The inside of the aforementioned sheath is coated with conformal coating and then filled with insulating sealant.

[0010] The top surface of the aforementioned sheath has an annular first groove with a built-in sheath sealing gasket.

[0011] Furthermore, the depth of the first groove is 2.5 mm, and the thickness of the sheath sealing gasket is 3 mm.

[0012] The bottom of the aforementioned sheath is fixed to the circuit board by positioning pins and / or fixing clips.

[0013] The bottom surface of the drive cover is provided with a lower groove, and the outer protrusion is placed in the lower groove through the upper cover sealing gasket.

[0014] Furthermore, the height of the aforementioned external protrusion is 3mm, the thickness of the upper cover sealing gasket is 3mm, and the depth of the lower groove is 5mm.

[0015] An EC motor includes a motor assembly and a driver assembly, wherein the driver assembly is provided with a secondary protection structure as described above.

[0016] The advantages of this utility model are: This utility model discloses a secondary protection structure based on an EC motor driver. The driver housing is made of cast aluminum alloy. In addition to the conventional internal cavity for fixing the circuit board, it also includes an inner boss and an outer boss. A sleeve positioned between the driver housing and the circuit board, with positioning pins and fixing clips at the bottom of the sleeve, allows for quick and accurate positioning and fixation. After fixation, the sleeve and circuit board form a rectangular cavity, physically isolating the connectors on the circuit board from other components and providing IP65 protection. This prevents rainwater, dust, and other conductive substances from flowing into the driver cavity, reducing circuit board lifespan, or even causing short circuits and damage, thus providing internal protection for the circuit board. Furthermore, the rectangular cavity corresponds to the rectangular hole in the center of the inner boss, allowing operators to connect external power and control lines to the circuit board connectors. Without affecting wiring, the outer boss and the driver cover provide a sealed installation, completing the external protection for the driver assembly.

[0017] This utility model discloses a secondary protection structure based on an EC motor driver. It features high structural strength, good sealing performance, and reliable and stable operation, providing better protection for EC motors used in outdoor areas exposed to rain or dust. It also provides secondary protection against operational errors that may occur during wiring, improving the fault tolerance of the application environment, increasing the performance and service life of the EC motor driver, and has strong practicality and wide applicability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of the secondary protection structure.

[0019] Figure 2 This is an exploded view of the structural schematic diagram of the secondary protection structure.

[0020] Figure 3 This is a cross-sectional view of the structural schematic diagram of the driver assembly.

[0021] Figure 4 This is a schematic diagram of the top of the driver housing.

[0022] Figure 5 This is a schematic diagram of the bottom of the driver housing.

[0023] Figure 6 This is a schematic diagram of the sheath structure.

[0024] Figure 7 This is a schematic diagram of the structure of the sheath sealing gasket.

[0025] Figure 8 This is an assembly diagram of the circuit board, sheath, and sheath gasket.

[0026] The meanings of the markings in the attached diagram are as follows: 1. Motor assembly; 2. Driver assembly; 3. M5×20 socket head cap screws; 2-1. Driver housing; 2-2. Driver top cover; 2-3. Top cover sealing gasket; 2-4. Sheath sealing gasket; 2-5. Sheath; 2-6. Circuit board; 2-7. M4×10 first combination screw; 2-8. M5×16 second combination screw. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1 As shown, an EC motor consists of a motor assembly 1 and a driver assembly 2, which are fixedly connected by an M5×20 hexagon socket head cap screw 3.

[0029] The secondary protection structure of this utility model is provided on the driver assembly 2.

[0030] like Figure 2-3 As shown, the driver assembly 2, which is the basic main body of this utility model, is composed of driver housing 2-1, driver top cover 2-2, top cover sealing gasket 2-3, sheath sealing gasket 2-4, sheath 2-5, circuit board 2-6, M4×10 first combination screw 2-7, and M5×16 second combination screw 2-8.

[0031] like Figure 4-5 As shown, the driver housing 2-1 is made of aluminum alloy casting, with an external boss on the top. The driver top cover 2-2, top cover sealing gasket 2-3, and M5×16 second combination screws 2-8 work together to provide protection. The driver top cover 2-2 and top cover sealing gasket 2-3 are mounted on the external boss.

[0032] The bottom surface of the drive cover 2-2 is provided with a recessed groove that mates with the outer boss. The height of the outer boss is preferably 3mm, the thickness of the middle cover sealing gasket 2-3 is preferably 3mm, and the depth of the recessed groove of the drive cover 2-2 is preferably 5mm. Therefore, there is a compression amount of 1mm. By tightening the four M5×16 second combination screws 2-8, the drive cover 2-2 and the drive housing 2-1 (outer boss) are sealed, completing the overall external protection of the EC drive assembly. Its overall protection level meets the IP65 protection rating.

[0033] The internal cavity of the driver housing 2-1 is designed with a mounting bracket and matching threaded holes for fixing the circuit board 2-6. In addition, opposite to the outer boss, the driver housing 2-1 has an inner boss with a flat lower surface, used to accommodate the installation of the sheath sealing gasket 2-4 and the sheath 2-5, thus completing the seal between the driver housing 2-1 and the sheath 2-5. A rectangular hole is provided between the inner and outer bosses, corresponding to the cavity of the sheath 2-5, to ensure that the operator can connect the external power cable and control cable to the connector on the circuit board.

[0034] The height between the fixed support and the inner boss of the driver housing 2-1 is consistent with the effective height of the sheath 2-5. This ensures that the sheath 2-5 can theoretically complete the seal between the driver housing 2-1 and the circuit board 2-6. However, the gap generated during the actual assembly process is filled by the sheath sealing gasket 2-4.

[0035] like Figure 6-7As shown, the bottom of the sheath 2-5 is provided with 2 positioning pins and 2 fixing buckles, which are installed in conjunction with the 4 limiting holes on the matching circuit board 2-6. The fixing buckles on the sheath 2-5 are automatically fixed after installation, and then the sheath 2-5 is attached to the circuit board 2-6. The sheath 2-5 physically separates the connector on the circuit board 2-6 from other electronic components, forming a rectangular cavity.

[0036] The top of the sheath 2-5 has an annular first groove, preferably 2.5 mm deep, for placing the annular sheath sealing gasket 2-4. The thickness of the sheath sealing gasket 2-4 is preferably 3 mm, and it has an adhesive backing. The sheath sealing gasket 2-4 is embedded in the first groove and fixed by the adhesive backing; after assembly, the sheath sealing gasket 2-4 protrudes about 0.5 mm from the top of the sheath 2-5 to facilitate compression sealing.

[0037] like Figure 8 As shown, a certain gap is left around the connector area of ​​circuit board 2-6 to ensure that the sheath does not interfere with other electronic components when it is fixed to the circuit board. Preferably, circuit board 2-6 has four limiting holes around the connector area for guiding, limiting and fixing the sheath 2-5. That is, the limiting holes cooperate with the two positioning pins and two fixing buckles on the bottom of the sheath 2-5 to ensure that the bottom of the sheath 2-5 fits snugly against circuit board 2-6, ensuring quick installation. After installation and fixing, a conformal coating is sprayed and a certain thickness of insulating sealant is poured into the formed rectangular cavity to ensure the electrical insulation performance of the connector area and to maintain stable electrical performance even in environments with a certain level of pollution.

[0038] Circuit board 2-6 is secured to the mounting bracket of driver housing 2-1 using six M4×10 first combination screws 2-7. Finally, the sheath sealing gasket 2-4, sheath 2-5, and circuit board 2-6 are assembled as a single unit and fixed to the mounting bracket of driver housing 2-1. Simultaneously, sheath 2-5 and its matching sheath sealing gasket 2-4, fixed to circuit board 2-6, fit tightly against the inner boss of driver housing 2-1. The height of the bottom of the inner boss relative to the mounting bracket matches the effective protective height of sheath 2-5, and the 0.5mm protrusion of the sheath sealing gasket 2-4 fills any gaps, ensuring an overall seal. The compression and fixing of the six M4×10 first combination screws effectively seals the area between sheath 2-5 and driver housing 2-1; the overall protection level meets the IP65 protection rating.

[0039] Finally, the inner boss of the driver housing 2-1, the sheath 2-5, the sheath sealing gasket 2-4, the circuit board 2-6, and the M4×10 first combination screw 2-7 work together to complete the secondary protection of the driver assembly.

[0040] Assembly process: The locating pins and fixing clips of the sheath 2-5 are placed inside the limiting holes of the circuit board 2-6. The bottom of the sheath 2-5 is attached to the circuit board 2-6, and the connector of the circuit board 2-6 is placed inside the rectangular cavity of the sheath 2-5. Electrical insulation performance in the connector area is ensured by internally spraying conformal coating and filling with a certain thickness of insulating sealant. The sheath sealing gasket 2-4 is bonded to the first groove on the top of the sheath 2-5 via adhesive backing. The three components are combined to form the circuit board assembly, ready for the next step.

[0041] The circuit board assembly is placed inside the driver housing 2-1 and fixed on the mounting bracket of the driver housing 2-1. It is secured by six M4×10 first combination screws 2-7. The sheath 2-5 and the sheath sealing gasket 2-4 are sandwiched between the driver housing 2-1 (inner boss) and the circuit board 2-6, and the sheath sealing gasket 2-4 completes the seal, completely isolating the connector of the circuit board 2-6 from other electronic components, achieving an IP65 protection level.

[0042] Place the upper cover sealing gasket 2-3 inside the upper cover 2-2 of the driver, and cooperate with the outer protrusion on the top of the driver housing 2-1. Place the upper cover sealing gasket 2-3 between the driver housing 2-1 and the upper cover 2-2 of the driver, and tighten and fix it with M5×16 second combination screws to complete the seal. Its sealing level reaches IP65, and finally the driver assembly 2 is assembled.

[0043] The upper end face of motor assembly 1 is joined with the lower end face of driver assembly 2. The gap between the two is filled with end face sealant. Four M5×20 socket head cap screws 3 are used to tighten and fix the end face sealant, thus completing the sealing between the driver assembly and the motor assembly. Finally, the assembly of the EC motor is completed.

[0044] Working principle: EC motors require the driver cover to be removed for wiring, which is mainly accomplished through connectors on the circuit board. In practical applications, due to harsh environments, rain, mud, and potentially conductive metallic substances may enter the driver assembly.

[0045] The drive cover 2-2 and its matching cover gasket 2-3, together with the drive housing 2-1, complete the overall sealing of the drive assembly 2, forming a primary protection with a protection level of IP65.

[0046] Circuit board 2-6 and sheath 2-5 are positioned and fixed through fixing holes. The connector on circuit board 2-6 is placed inside the rectangular cavity of sheath 2-5. The internal area is sprayed with conformal coating and filled with insulating sealant of a certain thickness to ensure the electrical insulation performance of the connector area. Sheath sealing gasket 2-4 is placed in the first groove at the top of sheath 2-5, which cooperates with the inner boss of controller housing 2-1 to isolate the connector on circuit board 2-6 from other electronic components. This forms a circuit board 2-6 whose connector is responsible for external electrical connection. The remaining part of circuit board 2-6 is inside the cavity of driver assembly 2. Its protection level reaches IP65, which prevents rainwater, mud and sand and other conductive metal substances from entering the cavity of driver assembly 2, thus providing secondary protection for driver assembly 2.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments do not limit this utility model in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A secondary protection structure based on an EC motor driver, characterized in that, Includes an open slot in the drive housing, wherein the top and bottom of the open slot are respectively provided with an outer boss and an inner boss; The outer protrusion is used to secure the driver cover; The inner boss is used to secure the sheath. The bottom of the sheath is fitted onto the circuit board inside the driver housing, and the internal cavity is used to connect the external power line and control line to the circuit board through the side hole of the outer boss.

2. The secondary protection structure according to claim 1, characterized in that, The inside of the sheath is coated with conformal coating and filled with insulating sealant.

3. The secondary protection structure according to claim 1, characterized in that, The top surface of the sheath has an annular first groove with a built-in sheath sealing gasket.

4. The secondary protection structure according to claim 3, characterized in that, The depth of the first groove is 2.5 mm, and the thickness of the sheath sealing gasket is 3 mm.

5. The secondary protection structure according to claim 1, characterized in that, The bottom of the sheath is fixed to the circuit board by a positioning pin and / or a fixing buckle.

6. The secondary protection structure according to claim 1, characterized in that, The bottom surface of the driver's upper cover is provided with a lower groove, and the outer protrusion is placed in the lower groove through the upper cover sealing gasket.

7. The secondary protection structure according to claim 6, characterized in that, The height of the outer protrusion is 3mm, the thickness of the upper cover sealing gasket is 3mm, and the depth of the lower groove is 5mm.

8. An EC motor, comprising a motor assembly and a driver assembly, characterized in that, The driver assembly is provided with the secondary protection structure as described in claims 1-7.

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