High-protection thin door motor

Abstract

The invention discloses a high-protection thin door motor, the axial thickness of the motor part of the door motor is less than or equal to 55mm, and the door motor comprises a shell, a large end cover, a stator coil, an encoder, an encoder cover plate, a waterproof chuck and a locking nut; a first wiring channel is formed in the lower part of the shell; the first wiring channel comprises a groove part and a wire outlet hole; a cable of the stator coil is led out through the first wiring channel. A preset angle is formed between the connecting line of the groove part and the center of a rotating shaft of the door motor and the vertical direction; the large end cover is fixed with the shell, a second wiring channel is arranged on the large end cover, and a cable of the encoder and a cable of the stator coil are bound together through the second wiring channel and then are led out through a cable outlet hole of the first wiring channel; the wire outlet hole is provided with a threaded hole for installing the waterproof chuck, and the locking nut is arranged between the waterproof chuck and the threaded hole. The thin door motor can achieve the protection grade of IP65 or above.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically to a highly protective thin door motor. Background Technology

[0002] Elevator door motors, as a core component of elevator systems, are primarily responsible for the opening and closing of the doors. The door motor is installed inside the door frame. To accommodate the small cross-sectional area of ​​the shaft and retain more maintenance space on the car top, door motors adopt a flat structure and permanent magnet synchronous technology. The motor thickness is typically controlled between 31 and 55 mm, significantly saving installation space. Currently, thin motors cannot directly install traditional waterproof clamps due to insufficient axial space (<55 mm). Chinese Patent Document 1 (CN208316520) discloses a technical solution, such as... Figure 1 As shown, the cable lead-out part of its structure relies on a combination of sealant and rubber ring for sealing. However, the sealant hardens and cracks after long-term use, and the rubber ring ages and deforms due to temperature and grease, causing the protection level to drop from the initial IP54 to below IP30. At the same time, the cable lead-out part of the door motor is subjected to tensile force during installation or maintenance, which can easily cause the encoder connector to break and be damaged, posing a safety hazard. Summary of the Invention

[0003] The technical problem to be solved by the present invention is how to provide a thin door motor with a high protection level.

[0004] To solve the above-mentioned technical problems, the present invention provides a highly protective thin door motor, wherein the axial thickness of the motor part of the door motor is less than or equal to 55 mm, and the door motor includes a housing, a large end cover, a stator coil, an encoder, an encoder cover plate, a waterproof clamp, and a locking nut;

[0005] The lower part of the housing is provided with a first wiring channel; the first wiring channel includes a groove and a wire outlet; the stator coil cable is led out through the first wiring channel; the line connecting the groove and the center of the door motor shaft is at a preset angle to the vertical direction;

[0006] The large end cover is fixed to the housing. The large end cover is provided with a second wiring channel. The encoder cable is bundled together with the stator coil cable through the second wiring channel and then led out through the outlet hole of the first wiring channel.

[0007] The outlet hole has a threaded hole for installing a waterproof clamp, and a locking nut is located between the waterproof clamp and the threaded hole.

[0008] Preferably, the outlet hole is a double-layer stepped hole, with the inner hole diameter on the side near the groove being smaller than the threaded hole diameter on the other side; a sealing gasket is provided in the inner hole on the side near the groove.

[0009] Preferably, the housing includes a stator coil mounting surface, the radial dimension of which is smaller than the outer ring dimension of the stator coil core.

[0010] Preferably, the bottom of the housing is provided with a fixed interface for the door motor relative to the door operator system.

[0011] Preferably, the inner surface of the first wiring channel is anodized.

[0012] Preferably, the large end cover has a machining step and a threaded hole for mounting and fixing the encoder; the large end cover has an annular and recessed machining surface for mounting the encoder cover plate.

[0013] Preferably, the outer threaded ring of the machined surface is coated with thermally conductive epoxy resin.

[0014] Preferably, the joint between the large end cap and the housing is further provided with a rectangular groove for filling with sealant.

[0015] Compared with existing technologies, the thin door motor of the present invention can achieve a protection level of IP65 or higher. Attached Figure Description

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0017] Figure 1 The figure is from Chinese Patent Document 1;

[0018] Figure 2 This is an exploded view of the highly protected thin door motor of Example 1;

[0019] Figure 3 This is a schematic diagram of the housing and first wiring channel of the highly protective thin door motor in Embodiment 1;

[0020] Figure 4 This is a schematic diagram of the stator coil routing of the high-protection thin door motor in Example 1;

[0021] Figure 5 This is a schematic diagram of the large end cover structure of the high-protection thin door motor in Example 1. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can fully understand other advantages and technical effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific embodiments, and the details in this specification can also be applied based on different viewpoints, with various modifications or changes made without departing from the overall design concept of the invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. The following exemplary embodiments of the present invention can be implemented in many different forms and should not be construed as being limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art.

[0023] Example 1

[0024] like Figures 2 to 5 As shown, this embodiment provides a highly protective thin door motor. The axial thickness of the motor part of the door motor is less than or equal to 55 mm. The door motor includes a housing 1, a large end cover 3, a stator coil 4, an encoder 4, an encoder cover plate 5, a waterproof chuck 6a, and a locking nut 6b.

[0025] The lower part of the housing 1 is provided with a first wiring channel; the first wiring channel includes a groove 11 and a wire outlet 12; the cable of the stator coil 4 is led out through the first wiring channel; the line connecting the groove 11 and the center of the door motor shaft forms a preset angle α with the vertical direction.

[0026] The large end cover 3 is fixed to the housing 1. The large end cover 3 is provided with a second wiring channel 31. The encoder 4 cable is bundled together with the stator coil 2 cable through the second wiring channel 31 and then led out through the outlet hole 12 of the first wiring channel. While increasing the protection level of the door motor, this also greatly increases the tensile strength that the encoder cable can withstand, further increasing reliability.

[0027] The outer surface of the cable outlet hole 12 of the housing 1 is milled, and a threaded hole of a certain size is machined for installing the waterproof clamp 6a. The waterproof clamp 6a can be axially tightened to fix the cable lead-out part 7, which is used to withstand the external tension of the cable and increase reliability. A locking nut 6b is added between the waterproof clamp 6a and the threaded hole to prevent loosening.

[0028] The outlet hole 12 is a double-layer stepped hole, with the inner hole diameter on the side near the groove 11 being smaller than the threaded hole diameter on the other side; a silicone sealing gasket 8 is provided in the inner hole on the side near the groove 11. On the one hand, it is used to protect the cable lead-out part of the stator coil 2 from being cut by the structural burrs of the housing 1, and on the other hand, it can block the inner cavity part from the threaded hole, further realizing the radial sealing of the cable part.

[0029] like Figure 3 As shown in the P-direction view, the bottom rectangular platform of the housing 1 is provided with a fixed interface for the door motor relative to the door machine system.

[0030] The housing 1 includes a stator coil mounting surface 13, the radial dimension of which is slightly smaller than the outer ring dimension of the stator coil 2 core, and the stator coil 2 is fixed by interference fit.

[0031] The housing 1 can be made by integral die casting of aluminum alloy or other processes, and the inner surface of the first wiring channel can be anodized.

[0032] like Figure 5 As shown, the large end cover 3 is provided with a machining step and a threaded hole 33 for mounting and fixing the encoder 4; the large end cover 3 is provided with an annular and recessed machining surface 32 for mounting the encoder cover plate 5. When mounting the encoder cover plate, thermally conductive epoxy adhesive (not shown in the figure) can be applied to the outer ring of the thread on the machining surface 32.

[0033] like Figure 5 As shown in the middle AA section, the joint between the large end cap 3 and the shell 1 is also provided with a rectangular groove 34 for filling with sealant to form a physically waterproof and dustproof outer protective layer.

[0034] In this embodiment, a three-tiered sealing system is achieved by using a housing with a cable outlet channel on the tilted stator coil mounting surface, an internal silicone rubber sealing gasket, an externally locking waterproof clamp, and thermally conductive epoxy adhesive applied to the joints of external protective components. This structure not only solves the problems of sealant hardening and cracking, and rubber ring aging and deformation due to temperature and grease affecting the sealing of thin permanent magnet synchronous motors with an axial thickness ≤55mm that rely solely on a combination of sealant and rubber ring, but also ensures the structural strength of the motor cable lead-out section through an innovative cable routing channel coupled with a waterproof clamp design. This significantly increases the external tensile force that the cable can withstand, greatly enhancing operability during installation and maintenance. Therefore, this solution is particularly suitable for high-humidity environments such as elevator car tops with water accumulation and subway tunnels.

[0035] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A highly protective, thin door motor, wherein the axial thickness of the motor portion of the door motor is less than or equal to 55 mm, characterized in that, The door motor includes a housing, a large end cover, a stator coil, an encoder, an encoder cover plate, a waterproof clamp, and a locking nut; The lower part of the housing is provided with a first wiring channel; the first wiring channel includes a groove and a wire outlet; the stator coil cable is led out through the first wiring channel; the line connecting the groove and the center of the door motor shaft is at a preset angle to the vertical direction; The large end cover is fixed to the housing. The large end cover is provided with a second wiring channel. The encoder cable is bundled together with the stator coil cable through the second wiring channel and then led out through the outlet hole of the first wiring channel. The outlet hole has a threaded hole for installing a waterproof clamp, and a locking nut is located between the waterproof clamp and the threaded hole.

2. The high-protection thin door motor according to claim 1, characterized in that, The outlet hole is a double-layer stepped hole, with the inner hole diameter on the side near the groove being smaller than the threaded hole diameter on the other side; a sealing gasket is provided in the inner hole on the side near the groove.

3. The high-protection thin door motor according to claim 1, characterized in that, The housing includes a stator coil mounting surface, the radial dimension of which is smaller than the outer ring dimension of the stator coil core.

4. The high-protection thin door motor according to claim 1, characterized in that, The bottom of the housing is provided with a fixed interface for the door motor relative to the door machine system.

5. The high-protection thin door motor according to claim 1, characterized in that, The inner surface of the first wiring channel is anodized.

6. The high-protection thin door motor according to claim 1, characterized in that, The large end cover has a machining step and threaded holes for mounting and fixing the encoder; the large end cover has a ring-shaped and recessed machining surface for mounting the encoder cover plate.

7. The high-protection thin door motor according to claim 6, characterized in that, The outer thread of the machined surface is coated with thermally conductive epoxy resin.

8. The high-protection thin door motor according to claim 1, characterized in that, The junction of the large end cap and the housing is also provided with a rectangular groove for filling with sealant.

Images