Outer rotor hollow cup stator motor structure for fan

Abstract

The utility model discloses an outer rotor hollow cup stator motor structure for a fan, which comprises a casing and a fan cover arranged at one end of the casing, a rotor assembly and a stator assembly are respectively arranged in an inner cavity of the casing, and an end cover is arranged at the other end, far away from the fan cover, of the casing. The beneficial effects of the utility model are that the winding is pre-wound on the plastic support, thereby reducing the vibration of the winding when the motor works, optimizing the technology of the iron core winding, improving the efficiency of the motor, and efficiently using a light load stage curve in the characteristics of the motor because the hollow cup has a high requirement on the rotating speed but has a low requirement on the torque; an outer rotor motor with the same power torque is small in size and weight, and the outer rotor is adopted and mostly adopts low-cost design.

Description

Technical Field

[0001] This utility model relates to the field of hollow cup stator motor technology, specifically to a structure of an external rotor hollow cup stator motor for a fan. Background Technology

[0002] The hollow cup motor eliminates the iron core structure, which fundamentally solves the various problems caused by the iron core structure. Therefore, in addition to the high power density brought about by the small size, the hollow cup motor also has the characteristics of high efficiency, fast speed and fast response.

[0003] Existing wind turbines often only require a certain point on the characteristic curve during use, with high requirements for speed and low requirements for torque, and the motor efficiency is difficult to improve. This results in a considerable waste of the motor characteristic curve. At the same time, the difficulty of hollow cups lies in manufacturing. Their winding method determines their high manufacturing difficulty and unstable structure. Utility Model Content

[0004] The purpose of this invention is to provide a structure for an external rotor hollow cup stator motor for wind turbines, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a structure for an external rotor hollow cup stator motor for a fan, comprising a housing and a shroud disposed at one end thereof, wherein a rotor assembly and a stator assembly are respectively disposed in the inner cavity of the housing, and an end cap is disposed at the other end of the housing away from the shroud.

[0006] In a further optimized configuration, the stator assembly consists of a yoke core and a mounting frame.

[0007] Furthermore, the mounting bracket is a one-piece molded plastic structure, with the coil wound around its upper end and fixed on the plastic mounting bracket, reducing the weight of the stator core, thereby reducing iron loss and improving efficiency.

[0008] In a further optimized configuration, a moving impeller and a fixed impeller are sequentially arranged between the housing and the shroud.

[0009] In a further optimized configuration, the mounting bracket is provided with anti-rotation protrusions, which are used to cooperate with the yoke core for installation.

[0010] In a further optimized configuration, a rotating shaft is provided between the rotor assembly and the stator assembly.

[0011] In a further optimized configuration, the moving impeller is connected to the rotating shaft via an interference fit, and the external shroud is interference-fitted onto the fixed impeller.

[0012] Beneficial effects

[0013] The external rotor hollow cup stator motor structure for fans provided by this utility model has the windings pre-wound on a plastic bracket, which reduces the vibration of the windings during motor operation and optimizes the process of the iron core winding. The use of hollow cups requires high speed but low torque, thus improving motor efficiency and making efficient use of the light load stage curve of motor characteristics. For the same power and torque, the external rotor motor has a smaller size and weight, and adopts an external rotor and mostly adopts a low-cost design. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the hollow cup stator structure of this utility model. Detailed Implementation

[0016] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0017] Example

[0018] like Figure 1-2 As shown, a structure of an external rotor hollow cup stator motor for a fan includes a housing 1 and a fan cover 2 disposed at one end thereon. A rotor assembly 3 and a stator assembly 4 are respectively disposed in the inner cavity of the housing 1, and an end cover 5 is disposed at the other end of the housing 1 away from the fan cover 2.

[0019] In this embodiment, the stator assembly 4 consists of a yoke core 6 and a mounting frame 7. The mounting frame 7 is an integrally molded plastic structure, and the coil is wound on its upper end. The coil is fixed on the plastic mounting frame, which reduces the weight of the stator core, thereby reducing iron loss and improving efficiency. Since the core is toothless, the motor has no cogging torque, which reduces the torque fluctuation of the motor and makes the motor more stable. Since the teeth of the winding are eliminated, the inner diameter of the stator is increased, and the air gap is increased accordingly while the rotor size remains unchanged, thus increasing the rotor speed. The bracket is used for pre-winding, and after winding, it is installed with the core through an interference fit, which reduces the vibration of the winding during motor operation and optimizes the core winding process.

[0020] A moving impeller 10 and a fixed impeller 8 are sequentially arranged between the casing 1 and the fan cover 2.

[0021] The mounting bracket 7 is equipped with anti-rotation protrusions, which are used to cooperate with the yoke core 6 for installation, reducing the vibration of the winding when the motor is working, optimizing the process of the core winding, and eliminating the risk of the winding coming apart.

[0022] A rotating shaft 9 is provided between the rotor assembly 3 and the stator assembly 4. The moving impeller 10 is connected to the rotating shaft 9 by interference fit, and the wind cover 2 provided on its exterior is interference fit on the stator impeller 8.

[0023] The rotor is made of stamped parts to reduce costs. It is connected to a shaft by interference fit, and then to two bearings on the iron core. It is axially positioned by adhesive and contacts the inner ring of the bearing by a shim.

[0024] The housing is a stamped part, which is concentric with the end cover through outer circle positioning, axially positioned by the end face and fixed with adhesive, and fixed to the impeller by three screws, which are also concentrically positioned by outer circle positioning.

[0025] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A structure for an external rotor hollow cup stator motor for a fan, characterized in that: The device includes a housing (1) and a fan shroud (2) disposed at one end of the housing (1). The housing (1) contains a rotor assembly (3) and a stator assembly (4). The housing (1) is provided with an end cap (5) at the other end away from the fan shroud (2). The stator assembly (4) is composed of a yoke core (6) and a mounting frame (7). The mounting frame (7) is an integrally formed plastic structure with a coil wound on its upper end. A moving impeller (10) and a fixed impeller (8) are disposed sequentially between the housing (1) and the fan shroud (2). The mounting frame (7) has anti-rotation protrusions, which are used to cooperate with the yoke core (6) for installation. A rotating shaft (9) is disposed between the rotor assembly (3) and the stator assembly (4). The moving impeller (10) is connected to the rotating shaft (9) by interference fit. The fan shroud (2) disposed outside the fan shroud is interference fit onto the fixed impeller (8).

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