Air float compressor stator lamination

Abstract

The application discloses a kind of air floating compressor stator lamination, including annular stator lamination main body, the inner circle side of the stator lamination main body is evenly provided with a plurality of wire embedding slot for accommodating winding in circumferential direction, two slot wedges are arranged in each wire embedding slot, two slot wedges are arranged along the depth direction of wire embedding slot, two slot wedges and the slot wall of wire embedding slot are enclosed to form the passage for cooling airflow passing.The heat dissipation area is increased, and the temperature rise is reduced: the wire embedding slot adopts half-closed slot structure, the slot width is less than the width inside the slot cavity, so that the inner circle side surface of the stator lamination main body forms exposed heat dissipation surface between adjacent wire embedding slots, the exposed heat dissipation area of the stator core is increased, which is beneficial to the rapid export of winding and core heat, thereby reducing the temperature rise of motor.

Description

Technical Field

[0001] This invention relates to the field of stator lamination technology, specifically to a stator lamination for an air-floating compressor. Background Technology

[0002] Air-suspended (air-floating) compressors use gas-lubricated bearings to support the rotor, with no mechanical contact between the rotor and stator. This results in advantages such as oil-free operation, high speed, and low friction loss, making them widely used in refrigeration, process gas pressurization, and pneumatic conveying. The drive motor of an air-floating compressor typically consists of a stator core and a rotor. The stator core is formed by stacking multiple stator laminations axially, with several circumferential slots on the stator laminations to accommodate and secure the motor windings.

[0003] Currently, the slots on the stator laminations of air-floating compressor motors typically employ either closed or open slot structures. Closed slots, with their enclosed openings and windings completely encased within the core, limit the exposed heat dissipation area of ​​the stator core's inner surface. This makes it difficult to quickly dissipate the heat generated by the windings and core during motor operation, leading to a higher overall motor temperature rise. While open slots facilitate winding insertion, the open slots allow for localized turbulence and pressure pulsations in the cooling airflow as it passes through abrupt structural changes such as the slot openings and winding ends. This disrupts the uniformity of the internal cooling airflow. Furthermore, the pressure pulsations propagate towards the air bearing area, disturbing the air film stability of the air bearing. Combined with thermal deformation caused by temperature rise, this can easily lead to rotor-stator rubbing (contact friction), potentially causing air bearing failure and impacting the overall reliability and service life of the machine.

[0004] Therefore, how to increase the heat dissipation area of ​​the stator core to reduce the temperature rise of the motor while ensuring the convenience of winding, and at the same time smooth the sudden change of cooling airflow at the slot opening and reduce the impact of airflow disturbance on the air film stability of the air bearing, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a stator lamination for an air-floating compressor to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a stator lamination for an air-floating compressor, comprising an annular stator lamination body, wherein a plurality of winding slots for accommodating windings are uniformly formed on the inner circumferential side of the stator lamination body, and two slot wedges are provided in each winding slot, the two slot wedges being arranged at intervals along the depth direction of the winding slot, and the two slot wedges and the slot wall of the winding slot together forming a channel for cooling airflow to pass through.

[0007] Preferably, the wire-insertion groove is a semi-closed groove structure, and the groove opening width is smaller than the internal width of the groove cavity, so that the inner circular side surface of the stator lamination body forms an exposed heat dissipation surface between adjacent wire-insertion grooves.

[0008] Preferably, the groove opening section and the groove cavity section of the wire embedding groove are provided with a protrusion, and one of the groove wedges is located on the side of the protrusion facing the groove cavity of the wire embedding groove and abuts against the protrusion.

[0009] Preferably, the groove is provided with symmetrical grooves on both sides of the groove opening section, and the two ends of the other groove wedge are respectively embedded in the two grooves.

[0010] Preferably, when multiple stator lamination bodies are stacked axially to form a stator core, the channels on each stator lamination body are aligned axially and interconnected to form an axially continuous cooling airflow channel.

[0011] Preferably, the channel is used to guide and buffer the cooling airflow flowing through the slot opening to smooth out the sudden changes in cooling airflow at the slot opening.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. Increase heat dissipation area and reduce temperature rise: The winding slot adopts a semi-closed slot structure, and the slot opening width is smaller than the internal width of the slot cavity. This makes the inner circular side surface of the stator lamination body form an exposed heat dissipation surface between adjacent winding slots, which increases the exposed heat dissipation area of ​​the stator core. This is conducive to the rapid dissipation of heat from the winding and core, thereby reducing the temperature rise of the motor.

[0014] 2. Smoothing airflow abrupt changes: Each slot is equipped with two slot wedges arranged at intervals along the slot depth. The two slot wedges and the slot wall together form a channel for cooling airflow to pass through. When the cooling airflow passes through the slot opening, it is guided and buffered by the channel, which can smooth the abrupt changes in cooling airflow at the slot opening, reduce airflow pressure pulsation, and help maintain the uniform and stable flow of cooling airflow.

[0015] 3. Reduce the risk of rotor rubbing and improve reliability: The reduction of cooling airflow pressure pulsation helps to reduce the impact of airflow disturbances propagating to the air bearing area, which is conducive to maintaining the stability of the air bearing air film, reducing the risk of rotor and stator inner circle rubbing, thereby improving the reliability and service life of the whole machine. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the wire embedding groove of the present invention.

[0018] In the diagram: 1. Stator lamination body; 2. Embedded groove; 3. Groove wedge; 4. Channel; 5. Groove; 6. Protrusion. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] Please see Figure 1-2 This invention provides a technical solution: a stator lamination for an air-floating compressor, comprising an annular stator lamination body 1. Multiple winding slots 2 for accommodating windings are uniformly formed along the circumferential direction on the inner circular side of the stator lamination body 1. Each winding slot 2 contains two slot wedges 3, which are spaced apart along the depth direction of the winding slot 2. The two slot wedges 3 and the slot wall of the winding slot 2 together form a channel 4 for cooling airflow.

[0021] The winding slot 2 is a semi-closed slot structure, and the width of the slot opening of the winding slot 2 is smaller than the width of its internal cavity. Through this semi-closed slot structure, the inner circular side surface of the stator lamination body 1 forms an exposed heat dissipation surface between adjacent winding slots 2, which increases the exposed heat dissipation area of ​​the stator core and is conducive to the rapid dissipation of heat from the windings and the core.

[0022] A protrusion 6 is provided at the junction of the slot opening section and the slot cavity section of the winding groove 2. One slot wedge 3 is located on the side of the protrusion 6 facing the slot cavity of the winding groove 2 and abuts against the protrusion 6, thereby constraining the winding inside the slot cavity and limiting the winding. Grooves 5 are symmetrically formed on both sides of the slot wall near the slot opening of the winding groove 2, and the two ends of the other slot wedge 3 are respectively embedded in the two grooves 5. The two slot wedges 3 are arranged at intervals along the depth direction of the winding groove 2, and together they and the slot wall of the winding groove 2 enclose a channel 4. Through the cooperation of the protrusion 6 and the grooves 5, the two slot wedges 3 are stably fixed in the winding groove 2, making assembly simple and requiring no additional fasteners.

[0023] During assembly, multiple stator lamination bodies 1 are stacked axially to form a stator core. After stacking, the channels 4 on each stator lamination body 1 are aligned axially and interconnected to form an axially continuous cooling airflow channel. When the motor is running, the cooling airflow flows along this axially continuous channel and the exposed heat dissipation surface between adjacent winding slots 2, while carrying away the heat generated by the windings and the core.

[0024] When the cooling airflow passes through the slot opening of the inset groove 2, it is guided and buffered by the two slot wedges 3 and the channel 4, so that the sudden change in airflow at the slot opening is smoothed out and the pressure pulsation is reduced.

[0025] Working Principle: When the motor is running, the windings generate heat due to energization, and the stator core also generates heat due to iron losses caused by alternating magnetic flux. Cooling airflow enters and flows through the inner surface of the stator core, the exposed heat dissipation surface between adjacent winding slots 2, and the axially penetrating channel 4, exchanging heat with the windings and core and carrying away heat, thereby reducing the motor temperature rise. At the same time, because the winding slots 2 adopt a semi-closed slot structure and have two slot wedges 3 at the slot opening, the cooling airflow is guided and buffered when flowing through the slot opening and channel 4, the sudden airflow changes are smoothed, and the pressure pulsation is reduced. This helps to reduce the propagation of airflow disturbances to the air bearing area, maintain the stability of the air bearing air film, reduce the risk of rotor rubbing, and thus improve the reliability and service life of the entire machine.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stator lamination for an air-floating compressor, comprising an annular stator lamination body (1), wherein a plurality of winding slots (2) for accommodating windings are uniformly formed on the inner circumferential side of the stator lamination body (1), characterized in that: Each of the wire embedding grooves (2) is provided with two groove wedges (3). The two groove wedges (3) are arranged at intervals along the depth direction of the wire embedding groove (2). The two groove wedges (3) and the groove wall of the wire embedding groove (2) together form a channel (4) for the cooling airflow to pass through.

2. The stator lamination of an air-floating compressor according to claim 1, characterized in that: The inlay groove (2) is a semi-closed groove structure. The groove opening width of the inlay groove (2) is smaller than the internal width of its groove cavity, so that the inner circular side surface of the stator lamination body (1) forms an exposed heat dissipation surface between adjacent inlay grooves (2).

3. The stator lamination of an air-floating compressor according to claim 2, characterized in that: The groove (2) has a protrusion (6) at the junction of the groove opening section and the groove cavity section. One of the groove wedges (3) is located on the side of the protrusion (6) facing the groove cavity of the groove (2) and abuts against the protrusion (6).

4. The stator lamination of an air-floating compressor according to claim 3, characterized in that: The groove (2) has symmetrical grooves (5) on both sides of the groove wall, and the two ends of the other groove wedge (3) are respectively embedded in the two grooves (5).

5. The stator lamination of an air-floating compressor according to claim 1, characterized in that: When multiple stator lamination bodies (1) are stacked axially to form a stator core, the channels (4) on each stator lamination body (1) are aligned axially and interconnected to form an axially penetrating cooling airflow channel.

6. The stator lamination of an air-floating compressor according to claim 1, characterized in that: The channel (4) is used to guide and buffer the cooling airflow flowing through the slot opening of the inlay groove (2) to smooth out the sudden change in cooling airflow at the slot opening.

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