A rotary transformer integrated structure for a permanent magnet synchronous variable frequency motor

Abstract

This utility model discloses an integrated structure of a rotary transformer for a permanent magnet synchronous variable frequency motor, including a motor body, a rotating shaft rotatably mounted on the motor body, a rear bearing inner cover on the motor body, the rotating shaft extending out of the rear bearing inner cover, a rear bearing outer cover fastened to the rear bearing inner cover, a rear outer cover fastened to the rear bearing outer cover, a rotary transformer installed inside the rear outer cover, the rotary transformer connected to the rotating shaft, an elastic retaining ring fitted on the rotating shaft to limit the movement of the rotary transformer; and a rotary transformer outer cover fastened to the rear outer cover; thus achieving explosion-proof requirements after the rotary transformer is installed.

Description

Technical Field

[0001] This utility model relates to the field of variable frequency motor speed measurement technology, and in particular to a rotary transformer integrated structure for a permanent magnet synchronous variable frequency motor. Background Technology

[0002] Permanent magnet synchronous variable frequency motors require accurate feedback of actual rotational speed during operation. Comparing this feedback with the calculated speed is crucial for variable frequency control and starting. Therefore, a rotary transformer is needed to monitor the rotational speed. Due to explosion-proof requirements, the rotary transformer cannot be placed directly on the rear bearing cover for speed measurement. Since the rear bearing cover has an integrated oil filling hole, a sufficient explosion-proof clearance must be maintained between the rotary transformer and the oil filling hole after installation. Utility Model Content

[0003] (a) Technical issues

[0004] The purpose of this utility model is to provide an integrated structure for a rotary transformer in a permanent magnet synchronous variable frequency motor, which adds a structural part that meets explosion-proof requirements after the addition of the rotary transformer.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An integrated structure of a rotary transformer for a permanent magnet synchronous variable frequency motor includes a motor body, a rotating shaft rotatably mounted on the motor body, a rear bearing inner cover on the motor body, the rotating shaft extending out of the rear bearing inner cover, a rear bearing outer cover fastened to the rear bearing inner cover, a rear outer cover fastened to the rear bearing outer cover, a rotary transformer installed inside the rear outer cover, the rotary transformer connected to the rotating shaft, an elastic retaining ring fitted on the rotating shaft to limit the movement of the rotary transformer, and a rotary transformer outer cover fastened to the rear outer cover.

[0008] Preferably, the inner cover of the rear bearing has a first oil hole, and the outer cover of the rear bearing has a second oil hole that communicates with the first oil hole, and an oil cup is connected to the second oil hole.

[0009] Preferably, the rear bearing outer cover is provided with a protruding pressure ring portion, which is used to press against the bearing.

[0010] Preferably, the rear bearing outer cover has an installation cavity and a positioning groove located at the bottom of the installation cavity, and the rear outer cover has a positioning ring that cooperates with the positioning groove.

[0011] Preferably, the rear outer cover has a stepped groove, the rotary transformer is installed on the stepped groove, and the rotary transformer has an annular limiting part that abuts against the stepped groove.

[0012] Preferably, the outer cover of the rotary transformer is provided with a protruding insertion ring portion, which is engaged with the stepped groove.

[0013] Preferably, sealing rings are provided between the inner cover of the rear bearing and the outer cover of the rear bearing, between the outer cover of the rear bearing and the outer cover of the rear bearing, and between the outer cover of the rear bearing and the outer cover of the resolver.

[0014] Preferably, a flared connector is installed on the outer cover of the resolver, and a wire connecting the resolver passes through the flared connector.

[0015] Preferably, there is an explosion-proof gap between the rear bearing outer cover and the rotating shaft.

[0016] (III) Beneficial Effects

[0017] After the rear bearing outer cover is securely installed onto the rear bearing inner cover, a rear outer cover is further installed on the rear bearing outer cover. The rotary transformer is then installed inside the rear outer cover and connected to the shaft, thereby achieving shaft rotational speed connection. The rotary transformer is limited and connected to the shaft by an elastic retaining ring. The rotary transformer outer cover is also securely installed on the rear outer cover to protect and isolate the rotary transformer. Thus, the rotary transformer is isolated and installed inside the cavity formed by the rear outer cover and the rotary transformer outer cover, which is isolated relative to the rear bearing outer cover, thereby meeting the explosion-proof requirements. Attached Figure Description

[0018] Figure 1 This is an exploded structural diagram of an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the assembly structure of an embodiment of the present utility model;

[0020] Figure 3 This is a side view of an embodiment of the present utility model.

[0021] exist Figures 1 to 3 In the diagram, the correspondence between component names or lines and the drawing numbers is as follows:

[0022] 1. Motor body, 2. Shaft, 3. Rear bearing inner cover, 4. Rear bearing outer cover, 5. Rear outer cover, 6. Rotary transformer, 7. Elastic retaining ring, 8. Rotary transformer outer cover, 9. First oil hole, 10. Second oil hole, 11. Oil cup, 12. Pressure ring, 13. Mounting cavity, 14. Positioning groove, 15. Positioning ring, 16. Step groove, 17. Annular limiting part, 18. Insertion ring, 19. Trumpet nozzle connector. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] See Figures 1-3 As shown in the embodiment of this utility model, an integrated structure of a rotary transformer 6 for a permanent magnet synchronous variable frequency motor is proposed, including a motor body 1, a rotating shaft 2 rotatably mounted on the motor body 1, a rear bearing inner cover 3 on the motor body 1, and the rotating shaft 2 extending out of the rear bearing inner cover 3. The motor body 1 meets explosion-proof requirements, and the bearing needs to be lubricated by external oil injection. Directly adding the rotary transformer 6 to the rotating shaft 2 would result in too narrow a distance between it and the oil injection part, failing to meet explosion-proof requirements. Therefore, a rear bearing outer cover 4 is fastened to the rear bearing inner cover 3 for oil injection, and a rear outer cover 5 is fastened to the rear bearing outer cover 4. The rotary transformer 6 is installed inside the rear outer cover 5 and connected to the rotating shaft 2. An elastic retaining ring 7 is fitted on the rotating shaft 2 to limit the movement of the rotary transformer 6. The elastic retaining ring 7 limits the position of the rotary transformer 6, preventing wobbling relative to the rotating shaft 2 and ensuring that the rotating shaft 2 can rotate with the rotating part of the rotary transformer 6. Meanwhile, a resolver cover 8 is fastened to the rear outer cover 5. The resolver cover 8 and the rear outer cover 5 together form an isolation cavity, which isolates the resolver 6 and ensures explosion-proof requirements. The resolver 6 uses mature components to collect and transmit rotational speed data.

[0025] Specifically, the inner cover 3 of the rear bearing is provided with a first oil hole 9, and the outer cover 4 of the rear bearing is provided with a second oil hole 10 that connects to the first oil hole 9. An oil cup 11 is connected to the second oil hole 10. After oil is injected through the oil cup 11, it flows into the interior through the second oil hole 10 and the first oil hole 9 to achieve internal bearing lubrication.

[0026] Specifically, a protruding pressure ring 12 is provided on the rear bearing outer cover 4. The pressure ring 12 is used to press against the bearing. The length of the pressure ring 12 can also meet the explosion-proof requirements. Therefore, there is an explosion-proof gap between the rear bearing outer cover 4 and the rotating shaft 2. The explosion-proof gap is the gap between the pressure ring 12 and the rotating shaft 2, and it meets the explosion-proof requirements in length.

[0027] Meanwhile, an installation cavity 13 and a positioning groove 14 located at the bottom of the installation cavity 13 are provided on the rear bearing outer cover 4. The rear outer cover 5 is provided with a positioning ring 15 that cooperates with the positioning groove 14. The installation cavity 13 allows the rear outer cover 5 to be inserted, while the positioning groove 14 cooperates with the positioning ring 15 to form a positioning and explosion-proof sealing surface.

[0028] Specifically, a stepped groove 16 is provided on the rear outer cover 5, and the rotary transformer 6 is installed on the stepped groove 16. The rotary transformer 6 has an annular limiting part 17 that abuts against the stepped groove 16. The rotary transformer 6 is fastened to the stepped groove 16 by the annular limiting part 17, thereby realizing the stable installation of the rotary transformer 6 on the rear outer cover 5.

[0029] Similarly, the outer cover 8 of the resolver is provided with a protruding insertion ring 18, which is inserted into the stepped groove 16 to form an explosion-proof sealing surface, thereby ensuring that all interconnected parts meet the explosion-proof requirements.

[0030] To ensure a good seal after connection, sealing rings are provided between the inner cover 3 and the outer cover 4 of the rear bearing, between the outer cover 4 and the outer cover 5 of the rear bearing, and between the outer cover 5 and the outer cover 8 of the resolver, to prevent external water leakage from damaging the resolver 6.

[0031] In order to meet the requirements of explosion-proof wiring for the rotary transformer 6, a flared connector 19 is installed on the outer cover 8 of the rotary transformer. The wires connecting the rotary transformer 6 pass through the flared connector 19. After the flared connector 19 clamps the wires, it meets the explosion-proof requirements of the connection.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A rotating transformer (6) integrated structure of a permanent magnet synchronous variable frequency motor, comprising a motor body (1), a rotating shaft (2) is rotatably installed on the motor body (1), a rear bearing inner cover (3) is arranged on the motor body (1), and the rotating shaft (2) extends out of the rear bearing inner cover (3), characterized in that: The rear bearing inner cover (3) is fastened with a rear bearing outer cover (4), the rear bearing outer cover (4) is fastened with a rear outer cover (5), the rear outer cover (5) is installed with a rotary transformer (6), the rotary transformer (6) is connected to the rotating shaft (2), and the rotating shaft (2) is fitted with an elastic retaining ring (7) to limit the movement of the rotary transformer (6). A reversible cover (8) is fastened to the rear outer cover (5).

2. A resolver (6) integrated structure of a permanent magnet synchronous variable frequency motor according to claim 1, characterized in that: The inner cover (3) of the rear bearing is provided with a first oil hole (9), and the outer cover (4) of the rear bearing is provided with a second oil hole (10) that connects to the first oil hole (9). An oil cup (11) is connected to the second oil hole (10).

3. A resolver (6) integrated structure of a permanent magnet synchronous variable frequency motor according to claim 2, characterized in that: The rear bearing outer cover (4) is provided with a protruding pressure ring (12), which is used to press against the bearing.

4. A resolver (6) integrated structure of a permanent magnet synchronous variable frequency motor according to claim 3, characterized in that: The rear bearing outer cover (4) has an installation cavity (13) and a positioning groove (14) located at the bottom of the installation cavity (13). The rear outer cover (5) has a positioning ring (15) that cooperates with the positioning groove (14).

5. A resolver (6) integrated structure of a permanent magnet synchronous variable frequency motor according to claim 4, characterized in that: The rear outer cover (5) has a stepped groove (16) and the rotary transformer (6) is installed on the stepped groove (16). The rotary transformer (6) has an annular limiting part (17) that abuts against the stepped groove (16).

6. A resolver (6) integrated structure of a permanent magnet synchronous variable frequency motor according to claim 5, characterized in that: The outer cover (8) of the resolver is provided with a protruding insertion ring (18), which is engaged with the stepped groove (16).

7. A resolver (6) integrated structure of a permanent magnet synchronous variable frequency motor according to claim 6, characterized in that: Sealing rings are provided between the inner cover (3) of the rear bearing and the outer cover (4) of the rear bearing, between the outer cover (4) of the rear bearing and the outer cover (5) of the rear bearing, and between the outer cover (5) of the rear bearing and the outer cover (8) of the resolver.

8. A resolver (6) integrated structure of a permanent magnet synchronous variable frequency motor according to claim 7, characterized in that: The resolver cover (8) is equipped with a horn-shaped connector (19), through which the wires connecting the resolver (6) pass.

9. A resolver (6) integrated structure of permanent magnet synchronous variable frequency motor according to any one of claims 1-8, characterized in that: There is an explosion-proof gap between the rear bearing outer cover (4) and the rotating shaft (2).

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