External rotor motor

Abstract

The utility model discloses an external rotor motor which comprises an external rotor casing, the left side of the external rotor casing is provided with a left side sealing cover, the inner wall of the external rotor casing is fixedly provided with a plurality of permanent magnet magnetic strips, the internal part of the external rotor casing is provided with an internal stator iron core, and a rotor central shaft is inserted in a central shaft through hole. A plurality of right sealing cover air openings are formed in the right side of the right sealing cover, a fan is fixedly arranged on the outer surface of the rotor center shaft in a sleeving mode, and a plurality of left sealing cover air openings are formed in the left side of the left sealing cover. According to the external rotor motor, the rotor central shaft is driven to rotate through the rotation torque generated by the permanent magnet magnetic strips and the excitation winding, so that the rotor central shaft drives the fan to rotate, and the fan accelerates air circulation in the external rotor casing under the action of high-speed rotation; therefore, the air flow quickly flows to the right sealing cover air port through the left sealing cover air port to cool the interior of the outer rotor shell, so that the service life of the outer rotor motor is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of external rotor motors, in particular to an external rotor motor. Background Art

[0002] An outer rotor motor is a type of electric motor. Its main feature is the rotor on the outside and the stator on the inside. Compared to traditional inner rotor motors, this design offers several advantages, such as higher efficiency and smaller size. Outer rotor motors typically offer advantages such as high energy density, high efficiency, and high torque output, making them widely used in many fields.

[0003] Currently, all outer rotor motors on the market use the rotating magnetic field generated when current is transmitted to the excitation winding coil to drive the rotor to rotate, thereby realizing the process of converting electrical energy into mechanical energy. However, since the excitation winding coil generates high heat when the current increases, it can cause the internal parts of the rotor motor to burn out, shortening the service life of the outer rotor motor. Therefore, an outer rotor motor is proposed to cool the internal part of the outer rotor motor and extend its service life. Utility Model Content

[0004] In order to solve the technical problems existing in the background technology, the utility model proposes an outer rotor motor, which has the function of accelerating the speed of the air flow inside the outer rotor motor to reduce the internal temperature of the outer rotor motor and increase the service life of the outer rotor motor.

[0005] The utility model provides an outer rotor motor, comprising an outer rotor casing, a left side cover is provided on the left side of the outer rotor casing, a rotor limiting ring is fixed on the right side of the left cover, a center shaft end limiting seat is provided on the right side surface of the left cover, a plurality of permanent magnet strips are fixed on the inner wall of the outer rotor casing, an inner stator core is provided inside the outer rotor casing, a plurality of inner stator poles are fixed on the outer surface of the inner stator core, excitation windings are wound on the outer surfaces of the plurality of inner stator poles, a center shaft through hole is provided inside the inner stator core, a rotor center shaft is inserted into the inside of the center shaft through hole, and the right end of the rotor center shaft passes through and extends out of the right side of the right cover, a plurality of right cover air outlets are provided on the right side of the right cover, a fan is fixedly sleeved on the outer surface of the rotor center shaft, and a plurality of left cover air outlets are provided on the left side of the left cover.

[0006] Preferably, the outer rotor casing is a metal tube with the same left and right sides, the left end of the rotor central shaft is inserted into the end limit seat of the central shaft for connection, and the outer ring of the rotor limit ring is equal to the inner ring of the outer rotor casing.

[0007] Preferably, a screw hole is opened on the left side of the left cover, and a plurality of screw holes corresponding to the screw holes on the left side of the left cover are opened on the left side of the inner stator core. The inner stator core is connected and fixed to the inner stator core by bolts passing through the screw holes of the left cover.

[0008] Preferably, the fan is located between the right side cover and the inner stator core, a plurality of screw holes are provided on the right side of the right side cover, and the fan is fixedly connected to the right side of the outer rotor casing by bolts.

[0009] Preferably, the plurality of excitation windings are connected to the circuit board via wires, and the wires extend through the left cover air vent and are electrically connected to the circuit board.

[0010] Compared with the prior art, the above technical solution of the present invention has the following beneficial technical effects:

[0011] The outer rotor motor drives the central axis of the rotor to rotate through the rotational torque generated by the permanent magnet strips and the excitation winding, and then the central axis of the rotor drives the fan to rotate. Under the action of high-speed rotation, the fan accelerates the air circulation inside the outer rotor casing, so that the air flow quickly flows through the left cover air outlet to the right cover air outlet, thereby achieving cooling of the interior of the outer rotor casing, thereby improving the service life of the outer rotor motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural schematic diagram of an outer rotor motor proposed in the utility model.

[0013] Figure 2 This is a structural schematic diagram of another perspective of an outer rotor motor proposed by the utility model.

[0014] Figure 3 The figure is a schematic cross-sectional view of the outer rotor motor proposed in the present invention.

[0015] Figure 4 The present invention provides a schematic structural diagram of an inner stator core in an outer rotor motor.

[0016] Figure 5 The figure is a schematic diagram of the fan structure in an outer rotor motor proposed by the present invention.

[0017] Figure 6 This is a schematic structural diagram of the right side cover of an outer rotor motor proposed in the utility model.

[0018] Figure numerals: 1. outer rotor casing; 2. left side cover; 3. rotor limiting ring; 4. center shaft end limit seat; 5. right side cover; 6. rotor center axis; 7. right cover air outlet; 8. fan; 9. left cover air outlet; 10. permanent magnet strip; 11. inner stator pole; 12. excitation winding; 13. inner stator core; 14. center shaft through hole. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0020] In the description of the utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of the utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of the utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" can mean fixed connection, welding, riveting, bonding, etc., or detachable connection, threaded connection, key connection, pin connection, etc., or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediate medium, or it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood by those skilled in the art in specific circumstances.

[0022] like Figure 1-6As shown, the utility model proposes an outer rotor motor, including an outer rotor casing 1, a left side cover 2 is provided on the left side of the outer rotor casing 1, which can close the left side of the outer rotor casing 1, a rotor limiting ring 3 is fixed on the right side of the left cover 2 to limit a rotation position of the outer rotor casing 1, a center axis end limit seat 4 is provided on the right side of the left cover 2, a plurality of permanent magnet strips 10 are fixed on the inner wall of the outer rotor casing 1 to provide a constant magnetic field, an inner stator core 13 is provided inside the outer rotor casing 1 for concentrating and guiding the magnetic field, and the outer surface of the inner stator core 13 is fixed with Multiple inner stator poles 11 drive the rotor to rotate by generating a magnetic field. The outer surfaces of the multiple inner stator poles 11 are wound with excitation windings 12, which are mainly used to generate a magnetic field and adjust the voltage to ensure stable operation of the motor. A central axis through hole 14 is opened inside the inner stator core 13. The rotor central axis 6 is inserted into the central axis through hole 14, and the right end of the rotor central axis 6 passes through and extends out of the right side of the right cover 5. Multiple right cover air outlets 7 are opened on the right side of the right cover 5. A fan 8 is fixedly mounted on the outer surface of the rotor central axis 6, and multiple left cover air outlets 9 are opened on the left side of the left cover 2.

[0023] It should be noted that the rotor center shaft 6 can rotate on the center shaft through hole 14 of the inner stator core 13. When the outer rotor housing 1 rotates, it will drive the right cover 5 to rotate. At the same time, it will also drive the rotor center shaft 6 on the right cover 5 to rotate, thereby realizing the effect of mechanical transmission.

[0024] In an optional embodiment, the outer rotor casing 1 is a metal tube with the same left and right sides, the left end of the rotor center shaft 6 is inserted into the center shaft end limit seat 4 for connection, and the outer ring of the rotor limit ring 3 is equal to the inner ring of the outer rotor casing 1 in diameter.

[0025] In an optional embodiment, a screw hole is opened on the left side of the left cover 2, and a plurality of screw holes corresponding to the screw holes on the left side of the left cover 2 are opened on the left side of the inner stator core 13. The inner stator core 13 is connected and fixed to the inner stator core 13 by bolts passing through the screw holes of the left cover 2.

[0026] In an optional embodiment, the fan 8 is located between the right cover 5 and the inner stator core 13 . A plurality of screw holes are provided on the right side of the right cover 5 , and the fan 8 is fixedly connected to the right side of the outer rotor housing 1 by bolts.

[0027] In an optional embodiment, the plurality of excitation windings 12 are connected to the circuit board via wires, and the wires extend through the left cover air vent 9 and are electrically connected to the circuit board.

[0028] Specifically, when the outer rotor motor needs to be assembled, the rotor center shaft 6 can be passed through the right cover 5 and the fan 8 can be fixed on the rotor center shaft 6. Then, the inner stator core 13 can be picked up and the right end of the rotor center shaft 6 can be extended through the center shaft through-hole to the left side of the inner stator core 13. At the same time, the outer rotor casing 1 can be sleeved on the outside of the inner stator pole 11 of the inner stator core 13. After the outer rotor casing 1 is sleeved, the right cover 5 and the outer rotor casing 1 need to be fixed with bolts. After completing the above steps, the left cover 2 can be picked up and the rotor limiting ring 3 can be inserted through the center shaft through-hole. To the inner wall of the outer rotor casing 1, and use bolts to fix the left cover 2 to the inner stator core 13. When the outer rotor motor needs to be used, it is necessary to energize the excitation winding 12 on the inner stator core 13, so that the electromagnetic magnetic field generated by the current interacts with the magnets of the permanent magnet strips 10 of the outer rotor casing 1 to rotate the outer rotor casing 1. The rotated outer rotor casing 1 will drive the right cover 5 to rotate synchronously, thereby rotating the rotor center axis 6 fixed to the right cover 5, thereby completing the effect of converting electricity into mechanical power.

[0029] It should be understood that the above-described specific embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the scope of protection of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. An outer rotor motor, comprising an outer rotor housing (1), a left side cover (2) is provided on the left side of the outer rotor housing (1), a rotor limiting ring (3) is fixed on the right side of the left side cover (2), a center axis end limiting seat (4) is provided on the right side surface of the left side cover (2), a plurality of permanent magnet strips (10) are fixed on the inner wall of the outer rotor housing (1), an inner stator core (13) is provided inside the outer rotor housing (1), a plurality of inner stator poles (11) are fixed on the outer surface of the inner stator core (13), an excitation winding (12) is wound around the outer surface of the plurality of inner stator poles (11), a center axis through hole (14) is opened inside the inner stator core (13), and the motor is characterized in that: The rotor central shaft (6) is inserted into the central shaft through hole (14), and the right end of the rotor central shaft (6) passes through and extends out of the right side of the right cover (5). The right side of the right cover (5) is provided with a plurality of right cover air outlets (7). The outer surface of the rotor central shaft (6) is fixedly provided with a fan (8), and the left side of the left cover (2) is provided with a plurality of left cover air outlets (9).

2. The outer rotor motor according to claim 1, characterized in that: The outer rotor housing (1) is a metal tube with the same left and right sides. The left end of the rotor central shaft (6) is inserted into the central shaft end limit seat (4) for connection. The outer ring of the rotor limit ring (3) and the inner ring of the outer rotor housing (1) have the same diameter.

3. The outer rotor motor according to claim 1, characterized in that: The left side of the left cover (2) is provided with a screw hole, and the left side of the inner stator core (13) is provided with a plurality of screw holes corresponding to the screw holes on the left side of the left cover (2). The inner stator core (13) is connected and fixed to the inner stator core (13) by means of bolts passing through the screw holes of the left cover (2).

4. The outer rotor motor according to claim 1, characterized in that: The fan (8) is located between the right side cover (5) and the inner stator core (13); a plurality of screw holes are provided on the right side of the right side cover (5), and the fan (8) is fixedly connected to the right side of the outer rotor housing (1) by bolts.

5. The outer rotor motor according to claim 1, characterized in that: The plurality of excitation windings (12) are connected to a circuit board via a wire, and the wire extends through the left cover air vent (9) and is electrically connected to the circuit board.

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