Commutator short circuit detection device for coreless motor

Abstract

The utility model discloses a commutator short-circuit detection device for a coreless motor, and the device comprises a commutator which is composed of a housing, a commutator segment, a mica sheet, a bushing, and a shaft body. The commutator is arranged in the mold, and a connecting group connected with the commutator segment and the shaft body is arranged in the mold; the detection system comprises an inter-sheet voltage withstanding instrument and a sheet shaft voltage withstanding instrument, the inter-sheet voltage withstanding instrument and the sheet shaft voltage withstanding instrument are connected with the mold in parallel, the inter-sheet voltage withstanding instrument is electrically connected with the commutator segments through a connecting group and performs insulation test on the commutator segments, the sheet shaft voltage withstanding instrument is electrically connected with the commutator segments and the shaft body through a connecting group, and the sheet shaft voltage withstanding instrument is electrically connected with the commutator segments and the shaft body through a connecting group. And carrying out insulation test on the commutator segment and the shaft body. According to the utility model, the inter-segment voltage withstanding instrument detects whether short circuit exists between the commutator segments, and the segment shaft voltage withstanding instrument detects whether short circuit exists between the commutator segments and the shaft body, so that the detection of two defects can be realized on the same device without switching the detection device, and the detection efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of detection, and particularly relates to a commutator short - circuit detection device for a coreless motor. Background Art

[0002] Insulation is required between adjacent copper segments of the commutator and between the copper segment and the shaft body. Therefore, after manufacturing, it is necessary to detect the insulation between segments and between segment and shaft. Currently, in the market, multiple probes are used to contact the copper segments for detection, and this kind of structure is complex.

[0003] For example, the application number CN202010632047.5 discloses an automatic detection device for the insulation between copper segments of a commutator. The device discloses a copper segment detection mechanism, and the detection mechanism uses probes to conduct insulation tests on two adjacent copper segments. Another example is the application number CN201420062751.1, which discloses a commutator segment - shaft withstand voltage automatic detection device. The device discloses a high - voltage detection device for conducting insulation detection between the commutator segments and the shaft body.

[0004] Therefore, a detection device that can detect both the insulation state between segments and the insulation state between segment and shaft is needed. Content of the Utility Model

[0005] To solve the above - mentioned technical problems, the utility model discloses a commutator short - circuit detection device for a coreless motor. The device discloses a detection system for detecting whether there is a short - circuit between commutator segments and between the commutator segment and the shaft body. Two types of defects can be detected in the same device, improving the detection efficiency.

[0006] Specifically, the utility model discloses a commutator short - circuit detection device for a coreless motor, including:

[0007] A commutator, which is composed of a housing, commutator segments, mica sheets, bushings, and a shaft body;

[0008] A mold, in which the commutator is placed, and the mold has a connection group connected to the commutator segments and the shaft body;

[0009] A detection system, which includes an inter - segment withstand voltage tester and a segment - shaft withstand voltage tester. The inter - segment withstand voltage tester and the segment - shaft withstand voltage tester are connected in parallel with the mold. The inter - segment withstand voltage tester is electrically connected to the commutator segments through the connection group to conduct insulation tests on the commutator segments, and the segment - shaft withstand voltage tester is electrically connected to the commutator segments and the shaft body through the connection group to conduct insulation tests on the commutator segments and the shaft body.

[0010] By adopting the above - mentioned scheme, the inter - segment withstand voltage tester detects whether there is a short - circuit between the commutator segments, and the segment - shaft withstand voltage tester detects whether there is a short - circuit between the commutator segments and the shaft body. Two types of defects can be detected on the same device without switching the detection device, improving the detection efficiency.

[0011] Further, the connection group includes a first connection group, a second connection group, a third connection group, and a fourth connection group. The first connection group and the second connection group are arranged outside the third connection group, and the fourth connection group is arranged at the center of the mold.

[0012] Further, the number of the first connection group is the same as that of the second connection group, and the sum of their numbers is consistent with the number of commutator segments. The number of the third connection group is consistent with the number of commutator segments.

[0013] Among them, the first connection group and the second connection group are alternately arranged around the center of the mold.

[0014] Further, the positive electrode of the inter-segment withstand voltage tester is sequentially connected to the first connection group, and the negative electrode of the inter-segment withstand voltage tester is sequentially connected to the second connection group.

[0015] When the inter-segment withstand voltage tester and the commutator segments form an open circuit, there is no contact point between the commutator segments. When the inter-segment withstand voltage tester and the commutator segments form a closed circuit, there is a contact point between the commutator segments.

[0016] Further, the positive electrode of the segment-shaft withstand voltage tester is connected to the third connection group, and the negative electrode of the segment-shaft withstand voltage tester is connected to the fourth connection group.

[0017] When the segment-shaft withstand voltage tester, the commutator segments, and the shaft body form an open circuit, there is no contact point between the commutator segments and the shaft body. When the segment-shaft withstand voltage tester, the commutator segments, and the shaft body form a closed circuit, there is a contact point between the commutator segments and the shaft body.

[0018] Further, the detection system further includes an alarm unit and a switching unit. The alarm unit is connected in series with the inter-segment withstand voltage tester and the segment-shaft withstand voltage tester respectively, and the switching unit is switchably connected to the inter-segment withstand voltage tester and the segment-shaft withstand voltage tester. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art.

[0020] Figure 1 is the schematic diagram of inter-segment detection;

[0021] Figure 2 is the schematic diagram of segment-shaft detection;

[0022] Figure 3 is the cross-sectional view of the detection device mold;

[0023] Figure 4 is the top view of the detection device mold;

[0024] Figure 5 is the schematic diagram of the detection system.

[0025] The reference numerals involved in the accompanying drawings are as follows: commutator 1, commutator segment 11, shaft body 12, mold 2, first connection group 21, second connection group 22, third connection group 23, fourth connection group 24, detection system 3, inter-segment withstand voltage tester 31, shaft-segment withstand voltage tester 32, alarm unit 33, switching unit 34. Specific Embodiment

[0026] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0027] As Figures 1-5 shown, the present utility model discloses a commutator short-circuit detection device for a coreless motor, including:

[0028] Commutator 1, which is composed of a housing, commutator segments 11, mica sheets, bushings and shaft body 12;

[0029] Mold 2, in which the commutator 1 is placed, and the mold 2 has connection groups connected to the commutator segments 11 and the shaft body 12;

[0030] Detection system 3, which includes an inter-segment withstand voltage tester 31 and a shaft-segment withstand voltage tester 32. The inter-segment withstand voltage tester 31 and the shaft-segment withstand voltage tester 32 are connected in parallel with the mold 2. The inter-segment withstand voltage tester 31 is electrically connected to the commutator segments 11 through the connection group to perform insulation testing on the commutator segments 11 and the commutator segments 11. The shaft-segment withstand voltage tester 32 is electrically connected to the commutator segments 11 and the shaft body 12 through the connection group to perform insulation testing on the commutator segments 11 and the shaft body 12.

[0031] In the present utility model, the inter-segment withstand voltage tester 31 detects whether there is a short circuit between the commutator segments 11, and the shaft-segment withstand voltage tester 32 detects whether there is a short circuit between the commutator segments 11 and the shaft body 12. The detection of two defects can be achieved on the same device without switching the detection device, improving the detection efficiency.

[0032] In some embodiments of the present utility model, the connection group includes a first connection group 21, a second connection group 22, a third connection group 23 and a fourth connection group 24. The first connection group 21 and the second connection group 22 are arranged outside the third connection group 23, and the fourth connection group 24 is arranged at the center of the mold 2. By using the connection group to connect each part, only the commutator 1 in the mold 2 needs to be replaced during testing, without having to repeatedly connect the connection group, improving the detection efficiency.

[0033] In some embodiments of the present utility model, the number of the first connection groups 21 is the same as that of the second connection groups 22, and the sum of the numbers is consistent with the number of the commutator segments 11. The number of the third connection groups 23 is consistent with the number of the commutator segments 11. The first connection groups 21 and the second connection groups 22 are alternately arranged around the center of the mold 2. The alternate arrangement of the first connection groups 21 and the second connection groups 22 facilitates connection with different polarities of the inter-sheet withstand voltage tester 31, and is convenient for detecting the insulation of the commutator segments 11.

[0034] In some embodiments of the present utility model, the positive electrode of the inter-sheet withstand voltage tester 31 is sequentially connected to the first connection groups 21, and the negative electrode of the inter-sheet withstand voltage tester 31 is sequentially connected to the second connection groups 22; when the inter-sheet withstand voltage tester 31 and the commutator segments 11 form an open circuit, there is no contact point between the commutator segments 11; when the inter-sheet withstand voltage tester 31 and the commutator segments 11 form a closed circuit, there is a contact point between the commutator segments 11.

[0035] In some embodiments of the present utility model, the positive electrode of the sheet-shaft withstand voltage tester 32 is connected to the third connection groups 23, and the negative electrode of the sheet-shaft withstand voltage tester 32 is connected to the fourth connection groups 24; when the sheet-shaft withstand voltage tester 32, the commutator segments 11, and the shaft body 12 form an open circuit, there is no contact point between the commutator segments 11 and the shaft body 12; when the sheet-shaft withstand voltage tester 32, the commutator segments 11, and the shaft body 12 form a closed circuit, there is a contact point between the commutator segments 11 and the shaft body 12.

[0036] In some embodiments of the present utility model, the detection system 3 further includes an alarm unit 33 and a switching unit 34. The alarm unit 33 is respectively connected in series with the inter-sheet withstand voltage tester 31 and the sheet-shaft withstand voltage tester 32. The switching unit 34 is switchably connected to the inter-sheet withstand voltage tester 31 and the sheet-shaft withstand voltage tester 32. The switching unit 34 is used to switch the detection mode of the detection system 3. When the switching unit 34 is connected to the inter-sheet withstand voltage tester 31, the detection system 3 detects the insulation state between the commutator segments 11; when the switching unit 34 is connected to the sheet-shaft withstand voltage tester 32, the detection system 3 detects the insulation state between the commutator segments 11 and the shaft body 12; when the alarm unit 33 alarms, it indicates that the circuit is connected, the current detection item is unqualified, and the commutator 1 is defective.

[0037] For those of ordinary skill in the art, without departing from the inventive concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A commutation short-circuit detection device for a coreless motor, characterized in that, Including: A commutator (1), which is composed of a housing, commutator segments (11), mica sheets, bushings and a shaft body (12); A mold (2), in which the commutator (1) is placed, and the mold (2) has a connection group connected to the commutator segments (11) and the shaft body (12); A detection system (3), which includes an inter-segment withstand voltage tester (31) and a segment-shaft withstand voltage tester (32). The inter-segment withstand voltage tester (31) and the segment-shaft withstand voltage tester (32) are connected in parallel with the mold (2). The inter-segment withstand voltage tester (31) is electrically connected to the commutator segments (11) through the connection group to perform insulation testing on the commutator segments (11) and the commutator segments (11). The segment-shaft withstand voltage tester (32) is electrically connected to the commutator segments (11) and the shaft body (12) through the connection group to perform insulation testing on the commutator segments (11) and the shaft body (12).

2. The short-circuit detection device for the commutator (1) of a coreless motor according to claim 1, characterized in that, The connection group includes a first connection group (21), a second connection group (22), a third connection group (23) and a fourth connection group (24). The first connection group (21) and the second connection group (22) are arranged outside the third connection group (23), and the fourth connection group (24) is arranged at the center of the mold (2).

3. The commutator short-circuit detection device for a can-stack motor according to claim 2, wherein The number of the first connection group (21) and the second connection group (22) is the same, and the sum of the numbers is consistent with the number of the commutator segments (11). The number of the third connection group (23) is consistent with the number of the commutator segments (11); wherein, The first connection group (21) and the second connection group (22) are alternately arranged around the center of the mold (2).

4. The commutator short-circuit detection device for a coreless motor according to claim 3, wherein, The positive pole of the inter-segment withstand voltage tester (31) is sequentially connected to the first connection group (21), and the negative pole of the inter-segment withstand voltage tester (31) is sequentially connected to the second connection group (22); When the inter-segment withstand voltage tester (31) and the commutator segments (11) form an open circuit, there is no contact point between the commutator segments (11) and the commutator segments (11); when the inter-segment withstand voltage tester (31) and the commutator segments (11) form a closed circuit, there is a contact point between the commutator segments (11) and the commutator segments (11).

5. The short - circuit detection device for the commutator (1) of the coreless motor according to claim 3, characterized in that, The positive pole of the segment-shaft withstand voltage tester (32) is connected to the third connection group (23), and the negative pole of the segment-shaft withstand voltage tester (32) is connected to the fourth connection group (24); When the segment-shaft withstand voltage tester (32), the commutator segments (11) and the shaft body (12) form an open circuit, there is no contact point between the commutator segments (11) and the shaft body (12); when the segment-shaft withstand voltage tester (32), the commutator segments (11) and the shaft body (12) form a closed circuit, there is a contact point between the commutator segments (11) and the shaft body (12).

6. The commutator short-circuit detection device for a coreless motor according to claim 1, wherein, The detection system (3) further includes an alarm unit (33) and a switching unit (34). The alarm unit (33) is respectively connected in series with the inter-segment withstand voltage tester (31) and the segment-shaft withstand voltage tester (32), and the switching unit (34) is switchably connected to the inter-segment withstand voltage tester (31) and the segment-shaft withstand voltage tester (32).

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