Cage type rotor

Abstract

The utility model discloses a cage type rotor in the technical field of motors, which comprises a middle shaft and a plurality of iron core sheets, a shaft hole is formed in the middle of each iron core sheet, the iron core sheets are stacked and fixedly sleeved on the middle shaft, and a plurality of clamping grooves are formed in the edge of each iron core sheet. According to the utility model, the plurality of ventilation holes on the plurality of iron core sheets are overlapped to form the spiral ventilation channel, and in the high-speed rotation process of the rotor, the spiral ventilation channel forms a rotation centrifugal force at the air outlet end and forms a negative pressure in the ventilation channel, so that the cooling air flow circulates rapidly, the whole rotor is cooled rapidly, and the service life of the rotor is prolonged. Meanwhile, the front end ring and the rear end ring are connected with the arc-shaped front air plate and the arc-shaped rear air plate respectively, cooling airflow is concentrated at the air inlet end of the ventilation channel through the front air plate, air is guided into the air inlet end of the ventilation channel in a concentrated mode, the airflow circulation rate is further improved, and when the rotor is used for a long time, cooling of the rotor is guaranteed, and high-temperature heat accumulation of the rotor is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and specifically relates to a cage rotor. Background Art

[0002] The cage winding is a self-enclosed short-circuit winding, which is composed of bars inserted into each rotor slot and annular end rings at both ends. If the iron core is removed, the whole winding is in the shape of a "round cage", so it is called a cage winding. Generally, cast aluminum rotors are used for small cage motors; for medium and large motors, due to the difficulty in ensuring the quality of cast aluminum, a structure is adopted in which copper bars are inserted into the rotor slots and end rings are welded at both ends.

[0003] However, the cooling air flow of the existing cage rotors is introduced through the fins on the end rings at both ends, and the cooling effect of ordinary cage rotors is not good. When the motor is used for a long time, it is easy to cause the cage rotor to overheat, thereby reducing the service life of the motor. Based on this, the utility model designs a cage rotor to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a cage rotor to solve the problems of poor cooling effect of the ordinary cage rotor and easy overheating of the cage rotor when the motor is used for a long time.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A cage rotor includes a central shaft and a plurality of iron core sheets. A shaft hole is formed in the middle of each iron core sheet, and the plurality of iron core sheets are stacked and fixedly sleeved on the central shaft. A plurality of card slots are formed at the edges of the iron core sheets, and a plurality of ventilation holes are formed in each iron core sheet. The plurality of ventilation holes are stacked into a spiral ventilation duct for circulating cooling air flow. Front end rings and rear end rings are respectively arranged at both ends of the central shaft. A plurality of front air plates are fixedly welded on the front end ring, and a plurality of rear air plates are fixedly welded on the rear end ring. The front air plates and the rear air plates are both arc-shaped plates for conveying cooling air flow. A plurality of copper bars are bolted to the front end ring and the rear end ring, and the copper bars are fitted and embedded in the iron core sheets.

[0007] As a further scheme of the utility model: The plurality of front air plates are annularly and equidistantly distributed on the front end ring, and the plurality of rear air plates are annularly and equidistantly distributed on the rear end ring.

[0008] As a further scheme of the utility model: The distribution diameter of the plurality of front air plates is equal to the distribution diameter of the plurality of rear air plates.

[0009] As a further scheme of the utility model: The ventilation holes are in the shape of a quasi-square, and the plurality of ventilation holes are annularly and equidistantly distributed on the iron core sheets.

[0010] As a further embodiment of this utility model: the slot is T-shaped, the cross-section of the copper guide bar is T-shaped, and the copper guide bar is matched and snapped into the slot.

[0011] An electric motor includes a housing and a stator. The stator is fixedly installed inside the housing, and a squirrel-cage rotor is rotatably connected inside the stator. The stator provides a changing magnetic field and drives the squirrel-cage rotor. A cover is bolted to the open end of the housing. Cooling ports are provided on both the housing and the cover.

[0012] As a further embodiment of this utility model: a support base is welded to the bottom of the housing, and a U-shaped connecting hole is provided on the support base.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. In this utility model, a spiral ventilation channel is formed by stacking multiple ventilation holes on multiple iron chips. During the high-speed rotation of the rotor, the spiral ventilation channel generates centrifugal force at the air outlet and creates negative pressure within the ventilation channel, thereby allowing the cooling airflow to circulate rapidly and cool the rotor as a whole. At the same time, arc-shaped front and rear air plates are connected to the front and rear rings, respectively. During the rotor rotation, the front air plate concentrates the cooling airflow at the air inlet of the ventilation channel, allowing the gas to be concentrated and introduced into the air inlet of the ventilation channel. After the cooled airflow is discharged through the air outlet of the ventilation channel, the rear air plate quickly discharges the discharged hot airflow into the motor, thereby further improving the airflow rate. During long-term use of the rotor, this ensures the cooling of the rotor, avoids high-temperature heat accumulation, and improves the overall service life of the rotor.

[0015] 2. In this utility model, a copper conductor bar with a T-shaped cross-section is installed through a T-shaped slot. When the motor starts, the rotor current frequency is relatively high. According to the skin effect, the current density of the wider upper part of the copper conductor bar is greater than that of the narrower lower part. The current effect of the narrower lower part of the copper conductor bar is small, which is equivalent to reducing the cross-section of the copper conductor bar and increasing the rotor resistance, thus naturally reducing the starting current of the motor. After the motor starts, the skin effect of the copper conductor bar current disappears, the current distribution of the copper conductor bar is basically uniform, and the overall rotor resistance returns to the DC resistance. The rotor rotates at high speed, allowing the rotor to have a greater starting torque during startup and improving the starting performance of the rotor. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the overall exploded structure of this utility model;

[0018] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0019] Figure 4 This is a rear-view three-dimensional structural diagram of the present invention;

[0020] Figure 5 This is a side view structural diagram of the present invention;

[0021] Figure 6 This is a schematic diagram of the overall structure of the motor of this utility model;

[0022] Figure 7 This is a schematic diagram of the overall exploded structure of the motor of this utility model.

[0023] In the diagram: 1. Central shaft; 2. Iron chip; 3. Shaft hole; 4. Ventilation hole; 5. Slot; 6. Front end ring; 7. Front air plate; 8. Rear end ring; 9. Rear air plate; 10. Copper guide bar; 11. Housing; 12. Stator; 13. Cover. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0025] Please see Figures 1-5 In this embodiment of the utility model, a cage-type rotor includes a central shaft 1 and several iron chips 2. The iron chips 2 have a shaft hole 3 in the middle. The several iron chips 2 are stacked and fixedly sleeved on the central shaft 1. Several slots 5 are opened on the edge of the iron chips 2. Several ventilation holes 4 are opened on each iron chip 2. The multiple ventilation holes 4 are stacked to form a spiral ventilation channel for circulating cooling airflow. The two ends of the central shaft 1 are respectively provided with a front end ring 6 and a rear end ring 8. Several front air plates 7 are fixedly welded on the front end ring 6, and several rear air plates 9 are fixedly welded on the rear end ring 8. Both the front air plates 7 and the rear air plates 9 are arc-shaped plates. Both the front air plates 7 and the rear air plates 9 are used to transport cooling airflow. Several copper guide bars 10 are bolted to the front end ring 6 and the rear end ring 8. The copper guide bars 10 are matched and embedded in the iron chips 2.

[0026] Specifically, a front ring 6 and a rear ring 8 are installed at both ends. Several copper conductor bars 10 are bolted between the front ring 6 and the rear ring 8. Several copper conductor bars 10 are installed in the slots 5 of the iron chip 2. The detachable copper conductor bars 10 facilitate the overall installation and disassembly of the rotor. When the rotor is damaged later, it is easy to disassemble and install. The front ring 6, the rear ring 8, and several copper conductor bars 10 form a conductive circuit. The central shaft 1 passes through the shaft hole 3 in the iron chip 2, so that multiple iron chips 2 are stacked. Multiple iron chips 2 increase the overall magnetic flux of the rotor, further increasing the rotational torque of the front ring 6, the rear ring 8, and several copper conductor bars 10, allowing the rotor to rotate under the electromagnetic field generated by the motor. Multiple ventilation holes 4 are opened on the iron chip 2. After multiple iron chips 2 are stacked on the central shaft 1, multiple Multiple ventilation holes 4 on the iron chip 2 are stacked to form a spiral ventilation channel. During the high-speed rotation of the rotor, the spiral ventilation channel generates centrifugal force at the air outlet and creates negative pressure inside the ventilation channel, thereby allowing the cooling airflow to flow quickly and cool the rotor as a whole. At the same time, the front ring 6 and the rear ring 8 are respectively connected to the arc-shaped front air plate 7 and rear air plate 9. During the rotor rotation, the cooling airflow is concentrated at the air inlet of the ventilation channel by the front air plate 7, allowing the gas to be concentrated and introduced into the air inlet of the ventilation channel. After the cooled airflow is discharged through the air outlet of the ventilation channel, the rear air plate 9 quickly discharges the discharged hot airflow into the motor, thereby further improving the airflow rate. During long-term use of the rotor, the rotor is kept cool, avoiding high temperature heat accumulation and improving the overall service life of the rotor.

[0027] Furthermore, such as Figure 5 As shown, a ventilation channel is formed by stacking multiple iron chips 2. The air inlet and air outlet of the ventilation channel have a deflection angle β, which ranges from 5 degrees to 30 degrees. This allows the ventilation channel to generate centrifugal force during rotation, thereby increasing the fluid rate of the cooling gas and improving the cooling efficiency of the rotor.

[0028] Preferred, such as Figures 1-5 As shown, multiple front air vanes 7 are equidistantly distributed in a ring on the front end ring 6, and multiple rear air vanes 9 are equidistantly distributed in a ring on the rear end ring 8. The multiple front air vanes 7 equidistantly distributed in a ring on the front end ring 6 and the multiple rear air vanes 9 equidistantly distributed in a ring on the rear end ring 8 achieve dynamic balance during rotation, avoiding violent shaking of the rotor during rotation, resulting in smoother rotation and more stable operation.

[0029] Preferred, such as Figure 2 As shown, the distribution diameter of the multiple front air panels 7 is equal to the distribution diameter of the multiple rear air panels 9. Multiple front air panels 7 and multiple rear air panels 9 with the same distribution diameter generate approximately the same airflow during rotation, thus ensuring that the inlet and outlet airflow of the cooling airflow are approximately the same, allowing for rapid airflow circulation and thus rapid cooling of the rotor, resulting in a good cooling effect.

[0030] Preferred, such as Figure 2 and Figure 5 As shown, the ventilation holes 4 are U-shaped, and multiple ventilation holes 4 are distributed equidistantly in a ring on the iron chip 2. The U-shaped ventilation holes 4 increase the ventilation volume while ensuring the overall connection strength of the multiple iron chips 2, allowing the cooling airflow to circulate quickly and ensuring rapid cooling of the rotor.

[0031] Preferred, such as Figure 3 As shown, the slot 5 is T-shaped, and the cross-section of the copper conductor 10 is also T-shaped. The copper conductor 10 is fitted into the slot 5. The T-shaped slot 5 is used to install the copper conductor 10 with a T-shaped cross-section. When the motor starts, the rotor current frequency is high. According to the skin effect, the current density of the wider upper part of the copper conductor 10 is greater than that of the narrower lower part. The current effect of the narrower lower part of the copper conductor 10 is small, which is equivalent to reducing the cross-section of the copper conductor 10 and increasing the rotor resistance, thus naturally reducing the starting current of the motor. After the motor starts, the skin effect of the current in the copper conductor 10 disappears, the current distribution of the copper conductor 10 becomes basically uniform, and the overall rotor resistance returns to the DC resistance. The rotor rotates at high speed, giving it a greater starting torque during startup and improving its starting performance. After startup, the overall rotor resistance decreases, the current increases, and the rotor rotates faster, resulting in better performance.

[0032] Please see Figures 6-7 In this embodiment of the invention, an electric motor includes a housing 11 and a stator 12. The stator 12 is fixedly installed inside the housing 11, and a squirrel-cage rotor is rotatably connected inside the stator 12. The stator 12 provides a changing magnetic field and drives the squirrel-cage rotor. A cover 13 is bolted to the open end of the housing 11. Cooling ports are provided on both the housing 11 and the cover 13. The electric motor has a squirrel-cage rotor installed inside, and a stator 12 installed inside the housing 11. The stator 12 provides an alternating electromagnetic field to drive the internally installed squirrel-cage rotor. The open end of the housing 11 is sealed by the cover 13. The cooling ports on the housing 11 and the cover 13 facilitate the introduction and export of airflow. During the rotation of the squirrel-cage rotor, the introduction and export of cooling airflow is accelerated, rapidly cooling the entire motor. This ensures that the motor operates at its normal operating temperature even during prolonged use, extending its service life.

[0033] Preferred, such as Figure 7 As shown, a support base is welded to the bottom of the housing 11, and a U-shaped connection hole is provided on the support base. The support base welded to the bottom of the housing 11 provides overall support for the device, and the connection hole on the support base is used with bolts for fixed installation, thus fixing the entire device in place.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A cage-type rotor, comprising a central shaft (1) and a plurality of iron chips (2), wherein the iron chips (2) have a shaft hole (3) in the middle, the plurality of iron chips (2) are stacked and fixedly sleeved on the central shaft (1), and the edges of the iron chips (2) are provided with a plurality of slots (5), characterized in that: The iron core piece (2) is provided with a plurality of ventilation holes (4), the plurality of ventilation holes (4) are stacked into a spiral ventilation channel, the spiral ventilation channel is used for circulating cooling air flow, the middle shaft (1) is provided with a front end ring (6) and a rear end ring (8) at two ends respectively, the front end ring (6) is fixedly welded with a plurality of front wind plates (7), the rear end ring (8) is fixedly welded with a plurality of rear wind plates (9), the front wind plate (7) and the rear wind plate (9) are arc-shaped plates, the front wind plate (7) and the rear wind plate (9) are used for conveying cooling air flow, the front end ring (6) and the rear end ring (8) are bolted with a plurality of copper bars (10), and the copper bars (10) are matched and embedded in the iron core piece (2).

2. Cage rotor according to claim 1, characterized in that The plurality of front wind plates (7) are annularly and equidistantly distributed on the front end ring (6), and the plurality of rear wind plates (9) are annularly and equidistantly distributed on the rear end ring (8).

3. Cage rotor according to claim 2, characterized in that The distribution diameters of the plurality of front wind plates (7) and the plurality of rear wind plates (9) are equal.

4. The caged rotor of claim 1, wherein: The ventilation hole (4) is a character-like mouth shape, and the plurality of ventilation holes (4) are annularly and equidistantly distributed on the iron core piece (2).

5. The caged rotor of claim 1, wherein: The clamping groove (5) is a character-like T shape, the cross section of the copper bar (10) is a character-like T shape, and the copper bar (10) is matched and clamped in the clamping groove (5).

6. An electric machine comprising a cage rotor according to any one of claims 1-5, characterized in that: The motor includes a shell (11) and a stator (12), the stator (12) is fixedly installed in the shell (11), a cage rotor is rotatably connected in the stator (12), the stator (12) provides a rotating magnetic field and drives the cage rotor, the opening end of the shell (11) is bolted with a cover (13), and the shell (11) and the cover (13) are both provided with cooling openings.

7. The electric machine of claim 6, wherein: The bottom of the shell (11) is welded with a support seat, and the support seat is provided with a U-shaped connecting hole.

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