Method for testing insulativity between rotor main shaft and end cover

Abstract

The invention discloses a rotor main shaft and end cover insulativity test method, which comprises the following steps: S1, mounting a left bearing and a left end cover on the left side of a rotor main shaft, and mounting an inner cover, a right bearing, a steel sleeve and a right end cover on the right side of the rotor main shaft; s2, pressing an insulating seat into a left end cover hole of the left end cover; s3, enabling a main screw rod to penetrate through a gasket, a plurality of insulating gaskets and an insulating sleeve to obtain an insulating screw group; s4, enabling an insulating screw group to penetrate through a right end cover inner hole in the right end cover and an inner cover hole in the inner cover; s5, measuring an insulation resistance value between the rotor main shaft and the right end cover, and if the rotor main shaft and the right end cover are conducted, indicating that the insulation between the rotor main shaft and the right end cover is invalid; and S6, dismounting the insulating seat, and completing the test. The rotor main shaft and end cover insulativity test method can quickly detect whether the rotor main shaft and the right end cover are electrically insulated, effectively improves the reliability of the motor, and can adapt to insulation detection of motors of different specifications.

Description

Technical Field

[0001] The invention relates to a motor testing method, more specifically, to a method for testing the insulation between a rotor main shaft and an end cover. Background Art

[0002] like Figure 3 As shown, the motor M comprises a housing 1, a left end cover 2 (i.e., a front end cover) and a right end cover 3 (i.e., a rear end cover), and a rotor main shaft 4 is provided in the center of the housing. In order to solve the problem of motor shaft current, it is necessary to keep the rotor main shaft 4 and the left end cover 2 electrically conductive, add conductive carbon fiber at the front end, and keep the rotor main shaft 4 and the right end cover 3 electrically insulated. However, there is currently no effective method to determine whether the rotor main shaft 4 and the right end cover 3 are electrically insulated. Summary of the invention

[0003] Based on this, it is necessary to provide a method for testing the insulation of the rotor main shaft and the end cover to address the above technical issues.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A method for testing the insulation of a rotor main shaft and an end cover comprises the following steps: Step S1, installing a left bearing and a left end cover on the left side of the rotor main shaft, and installing an inner cover, a right bearing, a steel sleeve and a right end cover on the right side of the rotor main shaft, wherein the left end cover is connected to the casing via a left connecting screw, and the right end cover is connected to the casing via a right connecting screw; Step S2, pressing an insulating seat into the left end cover hole of the left end cover, wherein the insulating seat insulates the left bearing from the left end cover; Step S3, passing the main screw through the washer, a plurality of insulating gaskets and an insulating sleeve to obtain an insulating screw assembly; Step S4, passing the insulating screw assembly through the inner hole of the right end cover on the right end cover and the inner cover hole on the inner cover, and locking the main screw; Step S5, measuring the insulation resistance value between the rotor main shaft and the right end cover. If the rotor main shaft and the right end cover are conductive, the insulation between the rotor main shaft and the right end cover fails. Step S6, remove the insulating seat and complete the test.

[0005] As a preferred embodiment of the present invention, the insulating seat includes a cylindrical insulating cylinder, the bottom of the insulating cylinder is provided with an annular limiting flange, the outer diameter of the insulating cylinder is adapted to the inner diameter of the left end cover hole of the left end cover, and the inner diameter of the insulating cylinder is adapted to the outer diameter of the left bearing.

[0006] As a preferred embodiment of the present invention, the insulating seat is made of nylon.

[0007] As a preferred embodiment of the present invention, the insulating seat comprises a cylindrical insulating cylinder, the bottom of the insulating cylinder is provided with an annular limiting flange, the inner wall of the insulating cylinder is provided with an adapter slot, and a detachable adapter block is provided in the adapter slot.

[0008] As a preferred embodiment of the present invention, the cross-section of the adapter slot is in a "T" shape, and the adapter block includes a "T"-shaped base, and the base and the adapter arc radius are adapted to the outer diameter of the left bearing.

[0009] As a preferred embodiment of the present invention, the insulating seat and the adapter block are both made of nylon.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for testing the insulation of a rotor main shaft and an end cover. The method can quickly determine whether the rotor main shaft and the right end cover are electrically insulated, effectively improves the reliability of the motor, and can adapt to insulation detection of motors of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the scheme of the present invention, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 It is a schematic diagram of the motor test operation of the present invention; Figure 2 for Figure 1 The motor test operation diagram in the figure shows another perspective; Figure 3 for Figure 1 The schematic diagram of the motor test operation in the figure is a cross-sectional view; Figure 4 for Figure 3 A detailed enlarged schematic diagram of area A in FIG. Figure 5 for Figure 1 The motor test operation diagram in the figure is an exploded view at this time; Figure 6 for Figure 5 A schematic diagram of the three-dimensional structure of the insulating seat; Figure 7 for Figure 6 A schematic diagram of the cross-sectional structure of the insulating seat; Figure 8 for Figure 5 A schematic diagram of the three-dimensional structure of the insulating screw group; Fig. 9 for Figure 8 A schematic diagram of the three-dimensional structure of the insulating screw group; Fig.10 It is a schematic diagram of the three-dimensional structure of another embodiment of the insulating seat of the present invention; Fig.11 for Fig.10 The three-dimensional structural diagram of the insulating seat in FIG. 1 is another perspective; Fig.12 for Fig.10 A schematic diagram of the three-dimensional structure of the insulating seat; Fig.13 for Fig.12 A detailed enlarged schematic diagram of the B area; Fig.14 for Fig.12 A schematic diagram of the three-dimensional structure of the adapter block in FIG. Fig.15 It is a schematic three-dimensional structural diagram of another embodiment of the insulating seat of the present invention. DETAILED DESCRIPTION

[0013] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0014] like Figures 1 to 5 As shown, the motor M comprises a housing 1 , a left end cover 2 and a right end cover 3 , and a rotor 4A and a rotor main shaft 4 are arranged in the housing 1 .

[0015] The method for testing the insulation between the rotor main shaft and the end cover comprises the following steps: Step S1, installing a left bearing 5 and a left end cover 2 on the left side of the rotor main shaft 4, installing an inner cover 7, a right bearing 8, a steel sleeve 9 and a right end cover 3 on the right side of the rotor main shaft 4, the left end cover 2 is connected to the casing 1 through a left connecting screw 1A, and the right end cover 3 is connected to the casing 1 through a right connecting screw 1B; Step S2, pressing the insulating seat 6 into the left end cover hole 21 of the left end cover 2, the insulating seat 6 insulates the left bearing 5 from the left end cover 2; Step S3, passing the main screw 11 through the washer 14, a plurality of insulating spacers 13 and the insulating sleeve 12 to obtain the insulating screw assembly 10; Step S4, inserting the insulating screw assembly 10 through the right end cover inner hole 31 on the right end cover 3 and the inner cover hole 71 on the inner cover, and locking the main screw 11; Step S5, measuring the insulation resistance between the rotor main shaft 4 and the right end cover 3. If the rotor main shaft 4 and the right end cover 3 are conductive, it indicates that the insulating screw assembly 10 is damaged or there is a conductive foreign object, such as a metal wire, and the insulation between the rotor main shaft 4 and the right end cover 3 fails. Step S6, remove the insulating seat 6 and complete the test.

[0016] It should be noted that if the insulation test passes, after removing the insulating seat 6 , it is necessary to reinstall the formal left end cover assembly on the left side of the housing 1 , and the left end cover assembly will support the left bearing 5 at the left end of the rotor main shaft 4 .

[0017] like Figure 6 and Figure 7 As shown, the insulating seat 6 includes a cylindrical insulating cylinder 61, the bottom of which is provided with an annular limiting flange 62, the outer diameter of the insulating cylinder 61 is adapted to the inner diameter of the left end cover hole 21 of the left end cover 2, and the inner diameter of the insulating cylinder 61 is adapted to the outer diameter of the left bearing 5.

[0018] In addition, the insulating seat 6 is made of nylon and plays a role of isolation and insulation.

[0019] like Figures 10 to 14 In this case, the insulating seat 600 comprises a cylindrical insulating cylinder 610, a ring-shaped limiting flange 620 is provided at the bottom of the insulating cylinder 610, an adapter slot 611 is provided on the inner wall of the insulating cylinder 610, and a detachable adapter block 630 is provided in the adapter slot 611.

[0020] The cross section of the adapter slot 611 is T-shaped. The adapter block 630 includes a T-shaped base 631. The inner side of the base 631 is provided with an arc-shaped adapter arc surface 632. The arc radius of the adapter arc surface 632 is adapted to the outer diameter of the left bearing 5. Fig.11 As shown in the figure, the radius of the radian of the adapting arc surface 632 of the adapting block 630 is consistent with the inner diameter of the insulating cylinder 610 .

[0021] Obviously, the insulating seat 600 and the adapter block 630 are both made of nylon, which plays the role of isolation and insulation.

[0022] like Fig.15 FIG. 6 is another embodiment of the insulating seat of the present invention. At this time, the radius of the arc of the adapting arc surface 632 of the adapting block 630 is smaller than the inner diameter of the insulating cylinder 610. The user can select adapting blocks 630 of different specifications according to the size of the bearing or the main shaft to facilitate insulation testing.

[0023] The rotor main shaft and end cover insulation test method can quickly determine whether the rotor main shaft and the right end cover are electrically insulated, effectively improves the reliability of the motor, and can adapt to insulation detection of motors of different specifications.

[0024] Obviously, the embodiments described above are only part of the embodiments of the present application, rather than all of the embodiments. The drawings provide preferred embodiments of the present application, but do not limit the patent scope of the present application.

Claims

1. A method for testing the insulation between a rotor main shaft and an end cover, comprising the steps of: Step S1, installing a left bearing (5) and a left end cover (2) on the left side of the rotor main shaft (4), and installing an inner cover (7), a right bearing (8), a steel sleeve (9) and a right end cover (3) on the right side of the rotor main shaft (4), wherein the left end cover (2) is connected to the housing (1) via a left connecting screw (1A), and the right end cover (3) is connected to the housing (1) via a right connecting screw (1B); Step S2, pressing an insulating seat (6) into the left end cover hole (21) of the left end cover (2), wherein the insulating seat (6) insulates the left bearing (5) from the left end cover (2); Step S3, passing the main screw (11) through the washer (14), a plurality of insulating spacers (13) and the insulating sleeve (12) to obtain an insulating screw assembly (10); Step S4, inserting the insulating screw assembly (10) through the right end cover inner hole (31) on the right end cover (3) and the inner cover hole (71) on the inner cover, and tightening the main screw (11); Step S5, measuring the insulation resistance value between the rotor main shaft (4) and the right end cover (3); if the rotor main shaft (4) and the right end cover (3) are conductive, the insulation between the rotor main shaft (4) and the right end cover (3) fails; Step S6, remove the insulating seat (6) and complete the test.

2. The method for testing the insulation between the rotor main shaft and the end cover according to claim 1, characterized in that: The insulating seat (6) comprises a cylindrical insulating cylinder (61), the bottom of the insulating cylinder (61) is provided with an annular limiting flange (62), the outer diameter of the insulating cylinder (61) is adapted to the inner diameter of the left end cover hole (21) of the left end cover (2), and the inner diameter of the insulating cylinder (61) is adapted to the outer diameter of the left bearing (5).

3. The method for testing the insulation between the rotor main shaft and the end cover according to claim 2, characterized in that: The insulating seat (6) is made of nylon.

4. The method for testing the insulation between the rotor main shaft and the end cover according to claim 1, characterized in that: The insulating seat (600) comprises a cylindrical insulating cylinder (610), the bottom of the insulating cylinder (610) is provided with an annular limiting flange (620), the inner wall of the insulating cylinder (610) is provided with an adapter slot (611), and a detachable adapter block (630) is provided in the adapter slot (611).

5. The method for testing the insulation between the rotor main shaft and the end cover according to claim 4, characterized in that: The cross section of the adapter slot (611) is in a "T" shape. The adapter block (630) comprises a "T"-shaped base (631). An arc-shaped adapter arc surface (632) is provided on the inner side of the base (631). The arc radius of the adapter arc surface (632) is adapted to the outer diameter of the left bearing (5).

6. The method for testing the insulation between the rotor main shaft and the end cover according to claim 5, characterized in that: The insulating seat (600) and the adapting block (630) are both made of nylon.

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