Winding type motor rotor winding leading-out wire fixing device, motor and winding type motor rotor winding leading-out wire fixing method

Abstract

The invention discloses a winding type motor rotor winding leading-out wire fixing device, a motor and a method, the winding type motor rotor winding leading-out wire fixing device comprises a rotor winding leading-out wire, a fixing block, a mounting bolt, a rotor cable and a motor rotating shaft, the motor rotating shaft is provided with the fixing block through the mounting bolt, and the axial direction of the mounting bolt is consistent with the radial direction of the motor rotating shaft; the motor rotating shaft is provided with a rotor cable channel and a rotor cable outlet hole communicated with the rotor cable channel, and the rotor cable extends out of the motor rotating shaft through the rotor cable channel and the rotor cable outlet hole; and the rotor winding outgoing line is electrically connected with the rotor cable through a fastening bolt and is fastened on the fixing block through the fastening bolt. According to the invention, the connection reliability of the winding type motor rotor winding outgoing line is improved.

Description

Technical Field

[0001] The invention relates to a wound-rotor motor, and in particular to a device for fixing lead-out wires of a wound-rotor motor rotor winding, a motor and a method. Background Art

[0002] When the rotor of a wound-rotor motor is in steady-state operation, due to the high-speed rotation of the rotor, under the action of centrifugal force, the rotor winding lead wire at the connection between the rotor cable and the rotor coil will be subjected to a pulling force in the same direction as the centrifugal force, and the rotor cable will also be subjected to a pulling force in the same angle as its installation. At the same time, when the motor is running stably, the change in rotor temperature will also generate thermal stress in the rotor cable and the connection between the rotor cable and the coil. In addition, due to the different quality and materials of the components at the rotor cable and the coil lead wire, the centrifugal force and thermal stress generated by each component will also be different. If the connection between the rotor cable and the coil lead wire is not reliably fixed, there will be a risk of insulation damage and even breakage of the rotor winding lead wire or the rotor cable. Therefore, what kind of effective fixing structure is used for the rotor cable and the rotor winding lead wire of the wound-rotor motor is of great significance to the reliability of the wound-rotor motor.

[0003] like Figure 6 As shown, Chinese patent CN201805295U discloses a winding type motor rotor lead-out fixing device, which, when assembled, welds the rotor winding lead-out wire 1' and the lead-out wire connector 2' together, and then connects to the rotor cable 5' through the lead-out wire connector, and the lead-out wire connector 2' is an inverted "U"-shaped structure, through holes are opened on both side surfaces of the "U" shape of the lead-out wire connector 2', and mounting bolts 4' are passed through the through holes, and rotor cables 5' are attached to both side surfaces of the "U" shape of the lead-out wire connector 2', and the rotor cable 5' is fastened to both side surfaces of the "U" shape of the lead-out wire connector 2' by the mounting bolts 4' to achieve electrical connection, and at the same time, an insulating fixing block 3' is mounted on the mounting bolt 4', and the insulating fixing block is pressed on a mounting seat (not shown) by the mounting bolts 4' to achieve fixation. In this structure, when the motor rotor rotates at a high speed, the rotor lead wire fixing device will generate centrifugal force, so that the rotor lead wire fixing device as a whole will have a tendency to move relative to the mounting seat, and friction will be generated between the insulating fixing block 3' and the mounting seat. It is under the action of this friction that the rotor lead wire fixing device can be fixed on the mounting seat. However, in this structure, the mounting bolts 4' of the insulating fixing block 3' are fixed along the axial direction of the motor shaft, which is inconsistent with the direction of the movement tendency of the rotor lead wire fixing device in the direction of the centrifugal force generated by the centrifugal force when the motor rotor is running, resulting in the mounting bolts 4' of the insulating fixing block 3' being subjected to a bending shear force consistent with the direction of the centrifugal force, and the mounting bolts 4' are prone to fatigue fracture under long-term operation of the motor.

[0004] In addition, the fixation of the insulating fixing block in Chinese patent CN201805295U completely relies on the pre-tightening force of the mounting bolts to be converted into friction between the insulating fixing block and the mounting seat to limit the centrifugal movement of the entire rotor lead wire fixing device. This friction is affected by the temperature expansion coefficient of the material and the surface roughness of the insulating fixing block and the mounting seat, which will bring uncertainty to the safe and reliable fixation of the insulating fixing block during long-term use.

[0005] The structure of Chinese patent CN 201805295U is difficult to increase the number of rotor cables due to space limitations, which is not conducive to its application in high-power motors. Summary of the invention

[0006] The technical problem to be solved by the present invention is that, in view of the insufficient reliability of the existing winding motor rotor lead wire fixing device, the present invention provides a winding motor rotor winding lead wire fixing device with better reliability, a motor and a fixing method.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A device for fixing a lead-out wire of a wound-type motor rotor winding comprises a lead-out wire of a rotor winding, a fixing block, a mounting bolt, a rotor cable and a motor shaft, wherein:

[0009] The fixing block is mounted on the motor shaft by means of the mounting bolts, and the axial direction of the mounting bolts is consistent with the radial direction of the motor shaft;

[0010] The motor shaft is provided with a rotor cable channel and a rotor cable outlet hole communicating with the rotor cable channel, and the rotor cable extends out of the motor shaft through the rotor cable channel and the rotor cable outlet hole;

[0011] The rotor winding lead wire is electrically connected to the rotor cable via a fastening bolt and is fastened to the fixing block via the fastening bolt.

[0012] The present invention utilizes mounting bolts to fix the fixing block on the motor shaft, and the axial direction of the mounting bolts is consistent with the radial direction of the motor shaft. In this way, not only does the present invention avoid relying on friction force for fixing, but the axial direction of the mounting bolts in the present invention is consistent with the radial direction of the motor shaft, so that the centrifugal force applied to the present invention is completely offset by the pre-tightening pressure of the mounting bolts, and there is no need to convert the pre-tightening force into friction force. The mounting bolts are no longer subjected to bending and shear forces, thereby eliminating the risk of fatigue fracture of the fixed mounting bolts that is prone to occur in the prior art. At the same time, it also avoids the influence of material temperature expansion and friction coefficient on the connection and fixation of the present invention, thereby improving the reliability of the rotor winding lead wire fixing structure.

[0013] Preferably, one end of the fixing block is set as a connecting end, and the other end is set as a fixing end, a connecting hole is provided on the connecting end, connecting side surfaces are respectively provided at both ends of the connecting hole, and a mounting hole is provided on the fixing end.

[0014] Preferably, one end of the rotor winding lead wire is connected to the rotor core, and the other end is set to an inverted "U"-shaped structure, and the connecting end of the fixing block is inserted into the inverted "U"-shaped structure, and the fastening bolt passes through the connecting hole to fasten the rotor cable, the connecting end of the fixing block and the inverted "U"-shaped structure into one.

[0015] Preferably, the fixing block is in an inverted T-shape, and the upper end of the fixing block is set as the connecting end, and the lower end of the fixing block is set as the fixing end.

[0016] Preferably, a plurality of rotor cable outlet holes are arranged on the motor shaft, a plurality of connection holes are arranged on the fixing block along the axial direction of the motor shaft, and a plurality of the rotor cables pass through the rotor cable outlet holes respectively and are fastened to the fixing block.

[0017] Preferably, the rotor cable outlet hole is arranged to be inclined relative to the radial direction of the motor shaft.

[0018] Based on the same inventive concept, the present invention also provides a wound-rotor motor, which includes a rotor, and the rotor includes the rotor winding lead-out wire fixing device.

[0019] Based on the same inventive concept, the present invention also provides a method for fixing a lead wire of a wound-rotor motor rotor winding, which comprises:

[0020] The rotor cable is fixed in the rotor cable outlet hole by opening a rotor cable outlet hole and a rotor cable channel on the motor shaft;

[0021] A fixing block for connecting the rotor winding lead wire and the rotor cable is installed on the motor shaft, and the fixing block is fastened to the motor shaft by means of mounting bolts, wherein the axial direction of the mounting bolts is consistent with the radial direction of the motor shaft;

[0022] Extending the rotor cable out of the motor shaft from the rotor cable channel and the rotor cable outlet hole;

[0023] The rotor winding lead wire is electrically connected to the rotor cable via a fastening bolt, and the fastening bolt is fastened to the fixing block.

[0024] Preferably, the method for fixing the lead wires of the rotor winding of a wound-rotor motor can adapt to the cable fixing needs of motors of different power levels by adjusting the number of rotor cables and the size of the fixing blocks.

[0025] The present invention fixes the rotor cable in the rotor cable outlet hole by opening a rotor cable outlet hole and a rotor cable channel on the motor shaft, and installs a fixing block on the motor shaft to connect the rotor winding lead wire and the rotor cable, thereby effectively fixing the rotor winding lead wire and connecting the rotor winding lead wire and the rotor cable. At the same time, the present invention can adapt to the rotor cable fixing needs of motors of different power levels by adjusting the number of rotor cables and the size and length of the fixing block.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention can improve the stress state of the mounting bolts on the insulating fixing block when the motor is running from the source;

[0028] 2. The present invention can improve the reliability of the connection and fixation of the lead wires of the rotor winding of the wound-rotor motor;

[0029] 3. The present invention can be applied to the needs of fixing the lead wires of the rotor windings of wound-type motors with different power levels;

[0030] 4. The present invention has a flexible structure and strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0032] Figure 1 The figure is a schematic structural diagram of a device for fixing lead wires of a rotor winding of a wound-type motor according to the present invention.

[0033] Figure 2 for Figure 1 Side view of.

[0034] Figure 3 A three-dimensional diagram of a fixed block.

[0035] Figure 4 This is a three-dimensional diagram of the rotor winding leads.

[0036] Figure 5 The schematic diagram of the structure of the lead-out wire fixing device for the rotor winding of a high-power wound-rotor motor is shown in FIG.

[0037] Figure 6 The present invention is a structural schematic diagram of an existing winding type motor rotor winding lead-out wire fixing device. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0039] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] See also Figure 1 , Figure 2 An embodiment of the device for fixing the rotor winding lead wire of a wound-rotor motor of the present invention comprises a rotor winding lead wire 5, a fastening bolt 4, a mounting bolt 3, a fixing block 2, a rotor cable 1 and a motor shaft 6, wherein:

[0042] The fixing block 2 is fastened and installed on the motor shaft 6 by the mounting bolts 3, and the axial direction of the mounting bolts 3 is consistent with the radial direction of the motor shaft 6;

[0043] The motor shaft 6 is provided with a rotor cable passage 61 and a rotor cable outlet hole 62 communicating with the rotor cable passage 61, and the rotor cable 1 extends out of the motor shaft 6 through the rotor cable passage 61 and the rotor cable outlet hole 62;

[0044] The rotor winding lead wire 5 is electrically connected to the rotor cable 1 via the fastening bolts 4 , and is fastened to the fixing block 2 via the fastening bolts 4 .

[0045] In order to avoid abrasion of the rotor cable 1 during the rotation of the rotor as much as possible, the rotor cable outlet hole 62 is arranged to be inclined relative to the radial direction of the motor shaft 6 .

[0046] like Figure 3As shown, one end of the fixing block 2 is set as a connecting end 21, and the other end is set as a fixing end 22. The connecting end 21 and the fixing end 22 are integrally formed into an inverted T-shaped structural block. The connecting end 21 is provided with a first connecting hole 211 for passing the fastening bolt 4, and both ends of the connecting hole 211 are respectively provided with connecting side surfaces 212 for connecting with the rotor winding lead wire 5, and the fixing end 22 is provided with a mounting hole 221 for passing the mounting bolt 3.

[0047] like Figure 1 and Figure 4 As shown, one end of the rotor winding lead wire 5 is connected to the rotor core 7, and the other end is set to an inverted "U"-shaped structure. A second connecting hole 51 is set on the inverted "U"-shaped structure, and the connecting end 21 of the fixing block 2 is inserted into the inverted "U"-shaped structure. The fastening bolt 4 passes through the first connecting hole 211 and the second connecting hole 51 to fasten the rotor cable 1, the connecting end 21 of the fixing block 2 and the inverted "U"-shaped structure into one.

[0048] like Figure 5 As shown, for a high-power motor, multiple rotor cables 1 can be used, and multiple rotor cable outlet holes 62 are set on the motor shaft 6. The size of the fixed block 2 along the axial direction of the motor shaft is increased, and multiple connecting holes 221 are set. The multiple rotor cables 1 pass through the rotor cable outlet holes 32 and are fastened to the fixed block 2 via fastening bolts 4.

[0049] When the motor of the present invention is actually running, the centrifugal force generated by the rotor connecting components composed of the rotor winding lead wire 5, the fastening bolt 4, the mounting bolt 3, the fixing block 2, and the rotor cable 1 is completely offset by the pre-tightening pressure of the mounting bolt 3, and there is no need to convert the pre-tightening force into friction force, thereby eliminating the influence of centrifugal force, temperature and material surface roughness on the clamping force of the mounting bolt 3; at the same time, the tensile force on the mounting bolt 3 is mainly along the axial direction of the bolt, which optimizes the stress state of the mounting bolt 3 and improves the working strength of the mounting bolt 3.

[0050] The above is only a specific implementation scheme of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the art can make many possible changes and modifications to the technical scheme of the present invention by using the technical content disclosed above without departing from the scope of the technical scheme of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical scheme of the present invention should fall within the protection scope of the technical scheme of the present invention.

Claims

1. A device for fixing the lead wire of a rotor winding of a wound-rotor motor, comprising a rotor winding lead wire, a fixing block, a mounting bolt, a rotor cable and a motor shaft, characterized in that: The fixing block is mounted on the motor shaft by means of the mounting bolts, and the axial direction of the mounting bolts is consistent with the radial direction of the motor shaft; The motor shaft is provided with a rotor cable passage and a rotor cable outlet hole communicating with the rotor cable passage, and the rotor cable extends out of the motor shaft through the rotor cable passage and the rotor cable outlet hole; The rotor winding lead wire is electrically connected to the rotor cable via a fastening bolt and is fastened to the fixing block via the fastening bolt.

2. The device for fixing the lead-out wires of the rotor winding of a wound-rotor motor according to claim 1, characterized in that: One end of the fixing block is set as a connecting end, and the other end is set as a fixing end. A connecting hole is provided on the connecting end, connecting side surfaces are respectively provided at both ends of the connecting hole, and a mounting hole is provided on the fixing end.

3. The device for fixing the lead-out wires of the rotor winding of a wound-rotor motor according to claim 2, characterized in that: One end of the rotor winding lead wire is connected to the rotor core, and the other end is set to an inverted "U"-shaped structure, and the connecting end of the fixing block is inserted into the inverted "U"-shaped structure. The fastening bolt passes through the connecting hole to fasten the rotor cable, the connecting end of the fixing block and the inverted "U"-shaped structure into one.

4. The device for fixing the lead-out wires of the rotor winding of a wound-rotor motor according to claim 2, characterized in that: The fixing block is in an inverted T shape, and the upper end of the fixing block is set as the connecting end, and the lower end of the fixing block is set as the fixing end.

5. The device for fixing the lead-out wires of the rotor winding of a wound-rotor motor according to claim 2, characterized in that: A plurality of rotor cable outlet holes are arranged on the motor shaft, a plurality of connection holes are arranged on the fixing block along the axial direction of the motor shaft, and a plurality of rotor cables pass through the rotor cable outlet holes respectively and are fastened to the fixing block.

6. The device for fixing the lead-out wires of the rotor winding of a wound-rotor motor according to claim 1, characterized in that: The rotor cable outlet hole is arranged to be inclined relative to the radial direction of the motor shaft.

7. A wound rotor motor, comprising a rotor, characterized in that: The rotor comprises the rotor winding lead-out wire fixing device according to any one of claims 1 to 6.

8. A method for fixing the lead wire of a wound-rotor motor rotor winding, characterized in that: include: The rotor cable is fixed in the rotor cable outlet hole by opening a rotor cable outlet hole and a rotor cable channel on the motor shaft; A fixing block for connecting the rotor winding lead wire and the rotor cable is installed on the motor shaft, and the fixing block is fastened to the motor shaft by means of mounting bolts, wherein the axial direction of the mounting bolts is consistent with the radial direction of the motor shaft; Extending the rotor cable out of the motor shaft from the rotor cable channel and the rotor cable outlet hole; The rotor winding lead wire is electrically connected to the rotor cable via a fastening bolt, and the fastening bolt is fastened to the fixing block.

9. The method for fixing the lead wires of the wound-rotor motor rotor winding according to claim 8, characterized in that: The cable fixing requirements of motors of different power levels can be met by adjusting the number of rotor cables and the size of the fixing blocks.

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