Wiring structure of variable-frequency three-phase asynchronous motor

Abstract

The utility model relates to a wiring structure of a variable-frequency three-phase asynchronous motor, which comprises a wiring board, six binding posts are arranged on the wiring board, threads are arranged on the surfaces of the binding posts, the wiring structure further comprises a pressing plate, and six through holes for the six binding posts to penetrate through are formed in the pressing plate. A first conductive copper sheet and a second conductive copper sheet are arranged on the front face and the back face of the pressing plate respectively, the first conductive copper sheet is used for being matched with star connection of a wiring board, the second conductive copper sheet is used for being matched with delta connection of the wiring board, and the pressing plate is locked on the wiring board through a bolt. An operator connects a plurality of wires on the motor to the corresponding binding posts respectively, then turns over the pressing plate to the corresponding surface by adopting a corresponding connection method according to the operation power of the motor, and then installs the pressing plate on the wiring board, and the first conductive copper sheet or the second conductive copper sheet on the pressing plate can communicate the wires on the corresponding binding posts. Wiring of the variable-frequency and variable-speed motor can be facilitated.

Description

Technical Field

[0001] The utility model relates to the field of motors, in particular to a connection structure of a variable frequency three-phase asynchronous motor. Background Art

[0002] With the development of power electronics technology, AC variable frequency speed regulating motors have been widely used. Compared with ordinary three-phase asynchronous motors, variable frequency three-phase asynchronous motors can achieve different speeds and torques under the drive of the inverter to adapt to changes in load requirements. At present, there are two main wiring methods for variable frequency three-phase asynchronous motors: star connection and triangle connection. Different connection methods are used according to different motor operating powers.

[0003] The connection structure of the AC variable frequency speed regulating motor in the related technology is as follows Figure 1 As shown, the motor has a terminal box 2, a terminal board 1 is installed in the terminal box 2 by means of screws 12, six terminals 11 are fixed on the terminal board 1, and the six terminals 11 are arranged in two rows and three columns. The surfaces of the terminals 11 have threads, and multiple wires on the motor are respectively connected to the corresponding terminals 11, and then a conductive sheet 14 is installed, and the corresponding two terminals 11 are connected through the conductive sheet 14, and finally the nut 13 is tightened on the terminal 11 to complete the installation.

[0004] The entire installation process not only requires clarifying the connection of the wires, but also requires installing the conductive sheet and disassembling and installing the six nuts. The entire operation process is rather cumbersome. Utility Model Content

[0005] In order to facilitate the wiring of a variable frequency speed regulating motor, the present application provides a wiring structure of a variable frequency three-phase asynchronous motor.

[0006] The wiring structure of a variable frequency three-phase asynchronous motor provided in the present application adopts the following technical solution:

[0007] A wiring structure for a variable frequency three-phase asynchronous motor, comprising a terminal board, six terminals are arranged on the terminal board, the terminals have threads on their surfaces, and a pressing plate is provided on the pressing plate, six through holes are provided on the pressing plate for the six terminals to pass through, a first conductive copper sheet and a second conductive copper sheet are provided on the front and back sides of the pressing plate, respectively, the first conductive copper sheet is used to match the star connection of the terminal board, and the second conductive copper sheet is used to match the triangle connection of the terminal board, the pressing plate is locked on the terminal board by bolts, and a clamping piece is provided on the pressing plate for further clamping the wires or guide sheets connected to the terminals.

[0008] By adopting the above technical solution, the operator connects multiple wires on the motor to the corresponding terminals respectively, and then adopts the corresponding connection method according to the operating power of the motor, flips the pressure plate to the corresponding surface, and then installs it on the terminal board. The first conductive copper sheet or the second guide copper sheet on the pressure plate can connect the wires on the corresponding terminals. At the same time, the pressure plate and the clamping piece clamp the wires or guides connected to the terminals, which can facilitate the wiring of the variable frequency speed regulation motor.

[0009] Preferably, two screws are connected to the pressure plate, and two countersunk holes are provided on the pressure plate. The two countersunk holes are located between the six terminal posts, and two screws are respectively installed in the two countersunk holes. The pressure plate is fixed in the junction box by screws.

[0010] Preferably, the countersunk hole has a step surface, and a first thread is provided on the inner wall of the countersunk hole located on the side of the step surface away from the motor. Two bolts are connected to the pressure plate, and two through holes are provided on the pressure plate for the screw rod parts of the bolts to pass through. The first thread cooperates with the external thread of the bolt, and the bolt is threadedly connected to the first thread after passing through the through hole.

[0011] By adopting the above technical solution, the countersunk hole can be used not only for the installation of screws, but also for the installation of bolts.

[0012] Preferably, the end of the screw rod portion of the bolt is detachably connected to an elastic block, and when the pressure plate is installed on the terminal board, a gap is left between the bolt and the step surface, and the elastic block abuts against the corresponding screw.

[0013] By adopting the above technical solution, when the pressure plate is installed on the terminal board, the bolt is in a tightened state. At this time, the elastic block is deformed and abuts against the screw, pressing the screw, which can reduce the probability of the screw loosening. At the same time, the elastic block has a reaction force on the bolt, which can reduce the probability of the bolt loosening.

[0014] Preferably, a groove is provided on the end surface of the screw rod portion, and the elastic block comprises an abutment portion and a protrusion which is interference fit with the groove, and the abutment portion is used to tighten the screw.

[0015] Preferably, one end of the abutment portion away from the raised portion is covered with a wear-resistant pad.

[0016] By adopting the above technical solution, since the end of the screw has a cross groove and the abutting portion is made of a deformable soft material, the abutting portion directly abuts on the screw, which may cause the abutting portion to crack easily.

[0017] Preferably, the clamping member includes three clamping rings, which are made of elastic material. Several clamping rings are fixed on the back side of the pressure plate. The three clamping rings are respectively located on the outside of the second conductive copper sheet and are used to abut the wires or guide plates connected to the three unactuated terminals of the second conductive copper sheet.

[0018] By adopting the above technical solution, since the second conductive copper sheet has a certain thickness, the pressing plate alone may not be able to press the wires connected to the terminal, and the pressing ring can press the wires on the terminal.

[0019] The technical effects of this utility model are mainly reflected in the following aspects:

[0020] 1. The utility model sets a pressing plate, adopts a corresponding connection method according to the running power of the motor, flips the pressing plate to the corresponding surface, and then installs it on the terminal board. The first conductive copper sheet or the second guide copper sheet on the pressing plate can connect the wires on the corresponding terminal. At the same time, the pressing plate and the clamping member clamp the wires or guides connected to the terminal, which can facilitate the wiring of the variable frequency speed regulating motor;

[0021] 2. The utility model arranges an elastic block. When the pressure plate is installed on the terminal board, the bolt is in a tightened state. At this time, the elastic block is deformed and abuts against the screw, pressing the screw, which can reduce the probability of the screw loosening. At the same time, the elastic block has a reaction force on the bolt, which can reduce the probability of the bolt loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the motor wiring structure of the related technology.

[0023] Figure 2 It is a schematic diagram of the overall structure of the wiring structure of an embodiment of the present application on a motor.

[0024] Figure 3 It is a schematic diagram of the overall structure of the wiring structure of an embodiment of the present application.

[0025] Figure 4 It is a schematic diagram of the installation of the pressure plate of the embodiment of the present application.

[0026] Figure 5 It is a schematic diagram of the structure of the pressure plate of the embodiment of the present application.

[0027] Figure 6 yes Figure 3 Section view along line AA.

[0028] Figure 7 yes Figure 6 Enlarged view of point B in the middle.

[0029] Explanation of the reference numerals: 1. terminal block; 11. terminal post; 12. screw; 13. nut; 14. conductive sheet; 2. terminal box; 3. pressure plate; 31. through hole; 32. first conductive copper sheet; 33. second conductive copper sheet; 34. bolt; 341. groove; 35. countersunk hole; 351. step surface; 352. first thread; 36. elastic block; 361. abutment portion; 362. raised portion; 363. wear-resistant pad; 37. clamping ring; 38. through hole. DETAILED DESCRIPTION

[0030] The following is combined with Figure 2-7 The present application is further described in detail to make the technical solution of the present application easier to understand and grasp.

[0031] The embodiment of the present application discloses a wiring structure of a variable frequency three-phase asynchronous motor.

[0032] Reference Figure 2-Figure 5 A wiring structure of a variable frequency three-phase asynchronous motor of the present embodiment includes a terminal block 1, on which six terminals 11 are provided, and the terminals 11 have threads on their surfaces, and also includes a pressing plate 3, on which six through holes 31 are opened for the six terminals 11 to pass through, and a first conductive copper sheet 32 ​​and a second conductive copper sheet 33 are fixedly provided on the front and back sides of the pressing plate 3, respectively, the first conductive copper sheet 32 ​​is used to match the star connection of the terminal block 1, and the second conductive copper sheet 33 is used to match the triangle connection of the terminal block 1, the pressing plate 3 is locked on the terminal block 1 by a bolt 34, and a pressing piece is provided on the pressing plate 3 for further pressing the wires or guide sheets connected to the terminals 11.

[0033] Reference Figure 2-Figure 5 The operator connects multiple wires on the motor to the corresponding terminals 11 respectively, and then uses the corresponding connection method according to the operating power of the motor, flips the pressing plate 3 to the corresponding surface, and then installs it on the terminal board 1. The first conductive copper sheet 32 ​​or the second guide copper sheet on the pressing plate 3 can connect the wires on the corresponding terminals 11. At the same time, the pressing plate 3 and the clamping piece clamp the wires or guides connected to the terminals 11, which can facilitate the wiring of the variable frequency speed regulation motor.

[0034] Reference Figure 5-Figure 7 Two screws 12 are connected to the pressure plate 3, and two countersunk holes 35 are provided on the pressure plate 3. The two countersunk holes 35 are located between the six terminal posts 11. The two screws 12 are respectively installed in the two countersunk holes 35, and the pressure plate 3 is fixed in the junction box 2 by the screws 12.

[0035] Reference Figure 4-Figure 7The countersunk hole 35 has a stepped surface 351. The countersunk hole 35 is provided with a first thread 352 on the inner wall of the stepped surface 351 away from the motor. Two bolts 34 are connected to the pressing plate 3. The pressing plate 3 has two through holes 38 for the screw rods of the bolts 34 to pass through. The first thread 352 matches the outer thread of the bolt 34. The bolt 34 passes through the through holes 38 and is threadedly connected to the first thread 352. The countersunk hole 35 can be used not only for the installation of the screw 12, but also for the installation of the bolt 34.

[0036] Reference Figure 7 The end of the screw rod of the bolt 34 is detachably connected with an elastic block 36 . When the pressing plate 3 is installed on the wiring board 1 , a gap is left between the bolt 34 and the step surface 351 , and the elastic block 36 abuts against the corresponding screw 12 .

[0037] Reference Figure 6 and Figure 7 When the pressure plate 3 is installed on the terminal block 1, the bolt 34 is in a tightened state. At this time, the elastic block 36 is deformed and abuts against the screw 12, pressing the screw 12, which can reduce the probability of the screw 12 loosening. At the same time, the elastic block 36 has a reaction force on the bolt 34, which can reduce the probability of the bolt 34 loosening.

[0038] Reference Figure 6 and Figure 7 The end surface of the screw rod of the screw 12 is provided with a groove 341, and the elastic block 36 includes an abutment portion 361 and a protrusion 362 which is interference fit with the groove 341, and the abutment portion 361 is used to abut the screw 12. One end of the abutment portion 361 away from the protrusion 362 is covered with a wear pad 363.

[0039] Reference Figure 6 and Figure 7 Since the end of the screw 12 has a cross groove and the abutting portion 361 is made of a deformable soft material, the abutting portion 361 directly abuts against the screw 12, which may cause the abutting portion 361 to crack easily.

[0040] Reference Figure 5 The clamping member includes three clamping rings 37, which are made of elastic material. Several clamping rings 37 are fixed on the back side of the pressure plate 3. The three clamping rings 37 are respectively located on the outside of the second conductive copper sheet 33 and are used to abut the wires or guide sheets connected to the three unactuated terminals 11 of the second conductive copper sheet 33.

[0041] Reference Figure 4 and Figure 5 Since the second conductive copper sheet 33 has a certain thickness, the pressing plate 3 alone may not be able to compress the wires connected to the terminal 11 , so a clamping ring 37 is needed to compress the wires on the terminal 11 .

[0042] Reference Figure 4 and Figure 7 The clamping ring 37 and the elastic block 36 are both made of rubber or silicone material, and the pressing plate 3, the clamping ring 37 and the elastic block 36 are not conductive.

[0043] Of course, the above are only typical examples of the present application. In addition, the present application may have many other specific implementation methods. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present application.

Claims

1. A connection structure for a variable frequency three-phase asynchronous motor, comprising a connection board (1), the connection board (1) being provided with six connection posts (11), characterized in that: It also includes a pressing plate (3), on which six through holes (31) are provided for six terminals (11) to pass through, and a first conductive copper sheet (32) and a second conductive copper sheet (33) are provided on the front and back sides of the pressing plate (3), respectively, the first conductive copper sheet (32) is used to match the star connection of the terminal board (1), and the second conductive copper sheet (33) is used to match the triangle connection of the terminal board (1), the pressing plate (3) is locked on the terminal board (1) by bolts (34), and a clamping piece is provided on the pressing plate (3) for further clamping the wires or guide sheets connected to the terminals (11).

2. The connection structure of a variable frequency three-phase asynchronous motor according to claim 1, characterized in that: Two screws (12) are connected to the pressing plate (3), and two countersunk holes (35) are provided on the pressing plate (3). The two countersunk holes (35) are located between the six terminal posts (11), and the two screws (12) are respectively installed in the two countersunk holes (35). The pressing plate (3) is fixed in the terminal box (2) by means of the screws (12).

3. The connection structure of a variable frequency three-phase asynchronous motor according to claim 2, characterized in that: The countersunk hole (35) has a stepped surface (351), and a first thread (352) is provided on the inner wall of the countersunk hole (35) located on the side of the stepped surface (351) away from the motor. Two bolts (34) are connected to the pressure plate (3), and two through holes (38) are provided on the pressure plate (3) for the screw rod parts of the bolts (34) to pass through. The first thread (352) matches the external thread of the bolt (34), and the bolt (34) is threadedly connected to the first thread (352) after passing through the through hole (38).

4. The connection structure of a variable frequency three-phase asynchronous motor according to claim 3, characterized in that: The end of the screw rod portion of the bolt (34) is detachably connected to an elastic block (36); when the pressure plate (3) is mounted on the terminal board (1), a gap is left between the bolt (34) and the step surface (351), and the elastic block (36) abuts against the corresponding screw (12).

5. The connection structure of a variable frequency three-phase asynchronous motor according to claim 4, characterized in that: A groove (341) is provided on the end surface of the screw rod portion of the screw (12); the elastic block (36) comprises a contact portion (361) and a protrusion (362) which is interference-fitted with the groove (341); the contact portion (361) is used to tighten the screw (12).

6. The connection structure of a variable frequency three-phase asynchronous motor according to claim 5, characterized in that: One end of the abutment portion (361) away from the raised portion (362) is covered with a wear-resistant pad (363).

7. The connection structure of a variable frequency three-phase asynchronous motor according to claim 1, characterized in that: The clamping member comprises three clamping rings (37), the clamping rings (37) are made of elastic material, a plurality of clamping rings (37) are fixed on the reverse side of the pressure plate (3), the three clamping rings (37) are respectively located on the outer side of the second conductive copper sheet (33), and are used to abut against the wires or guide plates connected to the three inactive terminals (11) of the second conductive copper sheet (33).

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