Outer rotor alternating current asynchronous motor

Abstract

The utility model relates to an external rotor alternating current asynchronous motor, which comprises a stator assembly, a rotor assembly, an output side end cover and a fixed side end cover, the stator assembly is provided with a stator iron core, and the stator iron core is an inclined stator iron core; the rotor assembly is provided with a rotor iron core, and the rotor iron core of the rotor assembly is a straight fluted rotor iron core; the outer rings of the rotor punching sheets are provided with connecting grooves, and the connecting grooves of the rotor punching sheets are laminated together to form long and straight connecting grooves; connecting rings are arranged at two ends of the rotor iron core; a screw hole for mounting and fixing the end cover is formed in the connecting ring; and the output side end cover and the fixed side end cover are respectively fixed on the connecting rings at the two ends by screwing screws into the screw holes. According to the utility model, through structure change, the connecting groove is arranged outside the rotor assembly, the installation and connection of external parts are facilitated, the output shaft at the single side is also arranged for shaft transmission connection and can be applied to other products, and the application scene of the motor is expanded.

Description

Technical Field

[0001] This utility model relates to an external rotor AC asynchronous motor, belonging to the field of electric motor technology. Background Technology

[0002] An external rotor AC asynchronous motor is a type of motor with the rotor located outside the motor and the stator located inside. It uses AC power (single-phase or three-phase) and can rotate directly after being connected to the power supply. Therefore, the drive and maintenance costs are low, and it is widely used.

[0003] The conventional structure of an external rotor AC asynchronous motor can be seen in Chinese Patent Publication No. CN212811403U, which describes an external rotor with a cast aluminum core and a low-noise external rotor motor; Chinese Patent Publication No. CN220711220U, which describes an integrated external rotor housing assembly; and Chinese Patent Publication No. CN216122015U, which describes a compact external rotor motor and a centrifugal fan. In these models, aluminum / copper is cast inside the rotor core to form an electromagnetic inductor. Simultaneously, a housing is wrapped around the rotor to form an output surface for mounting and connecting the driven components. Because the rotor is located on the outside, installation is limited by the available space; therefore, a flange is typically placed in the middle of the housing for mounting the external driven components. Thus, external rotor AC asynchronous motors are generally used as centrifugal fans for assembly with impellers, thereby fully utilizing the structural characteristics of external rotor AC motors.

[0004] In other fields, external rotor motors are also used, but generally external rotor DC motors are used. However, due to the limitations of the structure and drive characteristics of DC motors, the overall cost of motors and drive solutions is generally higher than that of AC motors.

[0005] Therefore, it is necessary to make appropriate improvements to the structure of the external rotor AC asynchronous motor in order to make it suitable for the assembly of the driven components with a limited increase in volume. Utility Model Content

[0006] The purpose of this utility model is to provide an external rotor AC asynchronous motor, which improves the structure of the motor by adding an external rotor component mounting structure, making it more applicable.

[0007] To achieve the above-mentioned utility model objectives, this utility model provides an external rotor AC asynchronous motor, including a stator assembly, a rotor assembly, an output side end cover, and a fixed side end cover;

[0008] The stator assembly includes a stator core, which is formed by stacking several stator laminations; the stator core is an obliquely positioned stator core.

[0009] A coil is embedded in the inclined slot of the stator core, and the coil is connected to the lead wire;

[0010] The motor shaft is installed in the middle of the stator core. One end of the motor shaft has a hole to pass through the lead wire, which passes through the end cover as a fixed end.

[0011] The other end of the motor shaft is an auxiliary support end;

[0012] The rotor assembly has a rotor core, which is made of several rotor laminations stacked together. The rotor slots are filled with cast aluminum and connected to aluminum end rings at both ends. The rotor core of the rotor assembly is a straight-slot rotor core.

[0013] A connecting groove is provided on the outer ring of the rotor lamination; the connecting grooves of each rotor lamination are stacked together to form a long straight connecting groove.

[0014] Connecting rings are installed at both ends of the rotor core, and the two connecting rings are fixed at both ends of the rotor core;

[0015] The connecting ring has screw holes for mounting the fixed end caps; the output end cap and the fixed end cap are respectively fixed to the connecting rings at both ends by screwing screws into the screw holes.

[0016] The output side end cover is a closed end cover. Inside the output side end cover is a bearing seat with a bearing installed, which is connected to the auxiliary support end of the motor shaft.

[0017] The fixed side end cover is a perforated end cover, through which the motor shaft's output wires pass; the fixed side end cover has a bearing seat inside, on which a bearing is installed, and the motor shaft's output wires pass through the bearing for support connection.

[0018] As a further improvement of this utility model, the inclination of the stator core is greater than 1 slot.

[0019] As a further improvement of this utility model, the screw hole on the connecting ring extends into the rotor core to form a fixing screw hole;

[0020] The screws for fixing the end cap are screwed into the fixing screw holes of the rotor core.

[0021] As a further improvement of this utility model, the connecting ring is welded and fixed to both ends of the rotor core.

[0022] Furthermore, rivets are inserted inside the rotor core.

[0023] As a further improvement of this utility model, the rotor lamination is provided with a connecting hole, and after the rotor core is formed, it has a long, straight and through connecting hole.

[0024] The connecting ring is also provided with a connecting hole, which is connected to the connecting hole of the rotor core;

[0025] Fasteners are provided to fix the connecting rings at both ends together with the rotor core.

[0026] Furthermore, the fasteners are rivets or screws.

[0027] Furthermore, the fastener is a screw; the connecting hole on the connecting ring is a countersunk hole;

[0028] The screw cap and the nut that holds the screw are located in the countersunk holes of the connecting hole of the connecting ring.

[0029] This utility model of an external rotor AC asynchronous motor, through structural modification, provides a connecting groove on the outside of the rotor assembly, facilitating the installation and connection of external components. It also features a single-sided output shaft for shaft drive connection, enabling the external rotor AC asynchronous motor to be used not only for centrifugal fan impeller installation but also for other products, thus expanding the application scenarios of the motor.

[0030] The external rotor AC asynchronous motor of this invention has a simple structure, is easy to manufacture and implement, and reduces the overall application cost. Attached Figure Description

[0031] Figure 1 The overall structural shape of the external rotor AC asynchronous motor of this utility model. Figure 1 ;

[0032] Figure 2 The overall structural shape of the external rotor AC asynchronous motor of this utility model. Figure 2 ;

[0033] Figure 3 This is an overall sectional view of the external rotor AC asynchronous motor of this utility model;

[0034] Figure 4 This is a schematic diagram of the overall structure of the stator assembly of this utility model;

[0035] Figure 5 This is a schematic diagram of the overall structure of the rotor assembly of this utility model;

[0036] Figure 6 This is an overall cross-sectional view of the rotor assembly of this utility model. Detailed Implementation

[0037] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0038] The overall structure of the external rotor AC asynchronous motor of this utility model is as follows: Figure 1 , Figure 2 As shown, the specific internal structure is as follows: Figure 3 As shown, it includes a stator assembly 1, a rotor assembly 2, an output side end cover 4, and a fixed side end cover 5.

[0039] Stator assembly 1, the specific structure is as follows: Figure 4As shown, a stator core is provided, which is formed by stacking several stator laminations. Compared with conventional external rotor AC asynchronous motors, the stator core of the stator assembly 1 of the external rotor AC asynchronous motor of this utility model is an inclined stator core with an inclination greater than 1 slot (that is, the stator slot on one end of the stator lamination of the stator core is deflected by more than 1 stator slot relative to the stator slot on the other end of the stator lamination).

[0040] Coil 14 is embedded in the inclined slot of the stator core. The coil 14 is designed according to the type of motor (single-phase or three-phase) and output power. Finally, the coils 14 are combined and connected to the lead wire 18 to connect to the power supply.

[0041] A motor shaft 16 is installed in the middle of the stator core. One end of the motor shaft 16 has a hole for threading the lead wire 18 and passing through the end cover as a fixed end. The other end of the motor shaft 16 is completely located inside the end cover and the motor body as an auxiliary support end 17.

[0042] Rotor assembly 2, the specific structure is as follows Figure 5 , Figure 6 As shown, a rotor core is provided, which is formed by stacking several rotor laminations. The rotor laminations are filled with cast aluminum and connected to aluminum end rings 21 at both ends. Compared to conventional external rotor AC asynchronous motors, the rotor core of the rotor assembly 2 of this invention is a straight-slot rotor core, meaning each rotor lamination is aligned and not tilted. A connecting groove 25 is added to the outer ring of the rotor laminations. When the rotor laminations are stacked and cast into a rotor core, the connecting grooves of each rotor lamination are stacked together to form a long, straight connecting groove 25, which can be used for connecting external components. This invention provides the connecting groove 25 close to the outer circumference of the rotor core for connecting external components, eliminating the need for a conventional motor housing design and greatly improving the utilization rate of the motor's output diameter. Furthermore, the rotor laminations are located directly on the outside, which is more conducive to heat dissipation.

[0043] Since the motor housing is no longer provided around the outer circle of the rotor core, in order to fix the motor end covers (output side end cover 4, fixed side end cover 5), preferably, connecting rings 3 are provided at both ends of the rotor core, and the two connecting rings 3 are fixed at both ends of the rotor core, thereby forming a rotor assembly.

[0044] The rotor core is made of cast aluminum, so the rotor laminations have a certain connection strength. Therefore, the connecting ring 3 can be directly welded to both ends of the rotor core. To improve strength, rivets can be inserted into the rotor core to reinforce the rotor laminations.

[0045] Alternatively, the rotor laminations are provided with connecting holes 22, and the rotor core also has long, straight and through connecting holes 22 after being assembled. The connecting ring 3 is also provided with connecting holes, and the connecting holes of the connecting ring 3 are connected to the connecting holes 22 of the rotor core. Rivets or screws are inserted into them to fix the connecting rings 3 at both ends to the rotor core. This achieves the connection between the connecting rings 3 and the rotor core, and also improves the connection strength between the laminations of the rotor.

[0046] In this embodiment, screw 26 is used for connection; the corresponding connecting hole on the connecting ring is a countersunk hole; the head of screw 26 and the nut that fixes screw 26 are respectively located in the countersunk hole of the connecting hole of the connecting ring; in this way, the end cap can be directly pressed onto the connecting ring 3 to achieve axial positioning.

[0047] The connecting ring 3 is also provided with a screw hole for installing the fixed end cover; preferably, the screw hole on the connecting ring 3 extends into the rotor core, forming a fixing screw hole 24. During manufacturing, the connecting ring 3 is first connected and fixed to the rotor core, and then the hole is enlarged according to the preset bottom hole on the connecting ring 3 and drilled into the rotor core. After cleaning the iron filings, the connecting ring 3 and the rotor core are tapped together, so that the internal threads of the connecting ring 3 and the rotor core are continuous, thereby forming the fixing screw hole 24. Thus, when the end cover is fixed to the connecting ring 3, the fixing screw 28 is screwed into not only the connecting ring 3, but also into the rotor core, so that the connecting ring 3 and the rotor core transmit power together, avoiding the situation where the power is only transmitted to the connecting ring 3 through the rotor core, and then the connecting ring 3 transmits the power to the end cover, which would cause the connection between the connecting ring 3 and the rotor core to be subjected to torque for a long time and thus cause displacement.

[0048] Meanwhile, the connecting ring 3 is heightened at the rotor core to accommodate the end of the coil 14 (i.e., the coil height), thus preventing high-voltage breakdown caused by the coil 14 being too close to the end cover.

[0049] The output-side end cover 4 is a closed end cover with an output shaft 44 for further external output. The output-side end cover 4 has a bearing seat with a bearing 6 installed inside, which is used to install the auxiliary support end 17 of the motor shaft 16.

[0050] The fixed side end cover 5 is a perforated end cover, through which the output end of the motor shaft 16 passes for motor fixation; the fixed side end cover 5 also has a bearing seat, on which a bearing 6 is installed, through which the output end of the motor shaft 16 passes for support and connection, improving stability.

[0051] The external rotor AC asynchronous motor of this utility model, through structural modification, has a connecting groove 25 set on the outside of the rotor assembly 2 to facilitate the installation and connection of external components. At the same time, a single-sided output end cover 4 / output shaft 44 is also provided for shaft drive connection, so that the external rotor AC asynchronous motor is not limited to the installation of centrifugal fan impellers, but can also be used in other products, thus expanding the application scenarios of the motor.

[0052] The preferred embodiments of this utility model have been described in detail above, but this utility model is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this utility model, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An external rotor AC asynchronous motor, including a stator assembly, a rotor assembly, an output side end cover, and a fixed side end cover; Its features are, The stator assembly includes a stator core, which is formed by stacking several stator laminations; the stator core is an obliquely positioned stator core. A coil is embedded in the inclined slot of the stator core, and the coil is connected to the lead wire; The motor shaft is installed in the middle of the stator core. One end of the motor shaft has a hole to pass through the lead wire, which passes through the end cover as a fixed end. The other end of the motor shaft is an auxiliary support end; The rotor assembly has a rotor core, which is made of several rotor laminations stacked together. The rotor slots are filled with cast aluminum and connected to aluminum end rings at both ends. The rotor core of the rotor assembly is a straight-slot rotor core. A connecting groove is provided on the outer ring of the rotor lamination; the connecting grooves of each rotor lamination are stacked together to form a long straight connecting groove. Connecting rings are installed at both ends of the rotor core, and the two connecting rings are fixed at both ends of the rotor core; The connecting ring has screw holes for mounting the fixed end caps; the output end cap and the fixed end cap are respectively fixed to the connecting rings at both ends by screwing screws into the screw holes. The output side end cover is a closed end cover. Inside the output side end cover is a bearing seat with a bearing installed, which is connected to the auxiliary support end of the motor shaft. The fixed side end cover is a perforated end cover, through which the motor shaft's output wires pass; the fixed side end cover has a bearing seat inside, on which a bearing is installed, and the motor shaft's output wires pass through the bearing for support connection.

2. The external rotor AC asynchronous motor as described in claim 1, characterized in that, The stator core is placed at an angle greater than 1 slot.

3. The external rotor AC asynchronous motor as described in claim 1, characterized in that, The screw hole on the connecting ring extends into the rotor core to form a fixing screw hole; The screws for fixing the end cap are screwed into the fixing screw holes of the rotor core.

4. The external rotor AC asynchronous motor as described in claim 1, characterized in that, The connecting rings are welded and fixed to both ends of the rotor core.

5. The external rotor AC asynchronous motor as described in claim 1 or 4, characterized in that, Rivets are inserted inside the rotor core.

6. The external rotor AC asynchronous motor as described in claim 1, characterized in that, The rotor laminations are provided with connecting holes, and the rotor core, after being assembled, has long, straight and through connecting holes. The connecting ring is also provided with a connecting hole, which is connected to the connecting hole of the rotor core; Fasteners are provided to fix the connecting rings at both ends together with the rotor core.

7. The external rotor AC asynchronous motor as described in claim 6, characterized in that, Fasteners are rivets or screws.

8. The external rotor AC asynchronous motor as described in claim 7, characterized in that, The fasteners are screws; the connecting holes on the connecting ring are countersunk holes; The screw cap and the nut that holds the screw are located in the countersunk holes of the connecting hole of the connecting ring.

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