A rotor balance detection device for a three-phase asynchronous motor

Abstract

The present invention belongs to the field of dynamic balance detection technology, and in particular, relates to a rotor balance detection device for a three-phase asynchronous motor, comprising a body, wherein the body is fixedly connected to a drive shaft through the driving end of the motor, a bracket is arranged on the drive shaft, and a linkage mechanism is installed on the bracket; a mounting ring is arranged at one end of the drive shaft away from the body, the drive shaft is connected to the mounting ring through a centrifugal mechanism, a turntable is rotatably connected inside the mounting ring, a rotating shaft is fixedly connected to the turntable, a detection rotor is sleeved on the rotating shaft, and a support column is arranged below the end of the rotating shaft away from the turntable. The present invention utilizes that in a liquid environment, the internal pressure is equal everywhere, can better reflect the direction of the force, and reacts sensitively, and also amplifies the force when colliding with each other through the fluidity of the liquid, wherein the liquid in the first contact box, the third contact box, and the second contact box reacts most quickly, sensitively and directly.

Description

Technical Field

[0001] The invention belongs to the technical field of dynamic balance detection, and in particular relates to a rotor balance detection device for a three-phase asynchronous motor. Background Art

[0002] The three-phase asynchronous motor is a type of induction motor that is powered by 380V three-phase AC current (phase difference of 120 degrees) at the same time. The rotor and stator rotating magnetic fields of the three-phase asynchronous motor rotate in the same direction and at different speeds, and there is a slip rate. The motor needs to be dynamically balanced before leaving the factory, among which the dynamic balance of the rotor is very important. The rotation state of the rotor will affect the stability of the generated power.

[0003] In the prior art, when performing dynamic balancing detection on the rotor of an electric motor, a balancing machine generally uses infrared rays to detect the deflection condition of the rotor during rotation. The detection using infrared rays relies on electronic equipment, the accuracy of which depends on the quality of the electronic components, and the subsequent maintenance costs are also high. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a rotor balance detection device for a three-phase asynchronous motor.

[0005] The present invention provides a rotor balance detection device for a three-phase asynchronous motor, comprising a body, wherein the body is fixedly connected to a drive shaft through a driving end of the motor, a bracket is provided on the drive shaft, and a linkage mechanism is installed on the bracket;

[0006] A mounting ring is provided at one end of the drive shaft away from the machine body, the drive shaft is connected to the mounting ring through a centrifugal mechanism, a turntable is rotatably connected in the mounting ring, a rotating shaft is fixedly connected to the turntable, a detection rotor is sleeved on the rotating shaft, a support column is provided below the end of the rotating shaft away from the turntable, the support column is used to support one end of the rotating shaft, and the detection rotor is provided between the support column and the turntable;

[0007] An upper vertical contact mechanism is provided above the detection rotor, a lower vertical contact mechanism is provided below the detection rotor, and horizontal contact mechanisms are provided on both sides of the detection rotor. The upper vertical contact mechanism includes a first contact box, the horizontal contact mechanism includes two second contact boxes, and the lower vertical contact mechanism includes a third contact box. One side of the first contact box, the second contact box, and the third contact box are all in contact with the surface of the detection rotor;

[0008] The linkage mechanism includes a guide rod, a pair of inner magnets, and a pair of outer magnets. The pair of inner magnets are symmetrically fixedly connected to the surface of the drive shaft. The pair of outer magnets and the pair of inner magnets are symmetrically arranged at the same height. The guide rod is arranged between the outer magnet and the inner magnet. The magnetic poles of the sides facing each other of the outer magnet and the inner magnet are opposite. The magnetic poles of the sides facing each other of the two outer magnets are the same, and the magnetic poles of the sides facing each other of the two inner magnets are also the same. The outer magnet and the guide rod are fixedly connected to the bracket.

[0009] The upper vertical contact mechanism also includes a return groove, linkage rods are symmetrically fixedly connected on both sides above the first contact box, the linkage rods are inserted in the return groove, the return groove is filled with variable current electro-hydraulic, the first contact box is also filled with variable current electro-hydraulic, a first moving piece is arranged in the first contact box, and sliding grooves for the first moving piece to move up and down are arranged on the inner walls at both ends of the first contact box, a floating bar and a baffle are arranged in the middle of the first moving piece, the floating bar makes the first moving piece float in the first contact box, the baffle is used to increase the amplitude of the shaking of the variable current electro-hydraulic, and the return groove is connected to the linkage mechanism through a wire;

[0010] The lower vertical contact mechanism also includes a middle groove, the lower end of the third contact box is fixedly connected to a first movable plate, the first movable plate is inserted in the middle groove, the third contact box is filled with variable current fluid, and the third contact box has a first movable sheet sliding up and down. The lower vertical contact mechanism also includes a side groove, the side groove is filled with variable current fluid, and the side away from the detection rotor is an inclined surface, the lower end of the second contact box is fixedly connected to a second movable plate, the second movable plate is inserted in the side groove, the lower end of the second movable plate is provided with a counterweight, the second contact box is filled with variable current fluid, and a second movable sheet is suspended inside.

[0011] Preferably, the centrifugal mechanism includes a rotating ring, a block and centrifugal springs fixedly connected to the four sides of the block, the rotating ring is rotatably mounted on the mounting ring, the rotating ring is fixedly connected to the turntable, the block is fixedly connected to one end of the driving shaft, the block is arranged inside the rotating ring, each of the centrifugal springs is fixedly connected to a clamping block at one end away from the block, and a slot for clamping the clamping block is provided on the inner wall of the rotating ring.

[0012] Preferably, the second contact box includes a shallow part and a deep part, a retaining groove is provided at one end of the second movable sheet located at the shallow part and away from the detection rotor, the opening of the retaining groove faces one side of the detection rotor, a suspension block is provided below one end of the second movable sheet located at the deep part, and the deep end of the second movable sheet is arranged opposite to the detection rotor.

[0013] Preferably, a contact is provided at the lower end of the first contact box, a contact piece used in conjunction with the contact is provided in the return groove, the contact piece in the return groove is located at an upper position, a connection point is provided in the middle groove and on the side groove on the inclined surface, the connection point is located above the liquid surface of the electrorheological fluid, and the return groove, the middle groove and the linkage rod are all electrically connected to the linkage mechanism through a wire.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention utilizes that the internal pressure in a liquid environment is equal everywhere, and can better reflect the direction of the force, and the reaction is sensitive. The fluidity of the liquid also amplifies the magnitude of the force when the two collide with each other. Among them, the liquid in the first contact box, the third contact box, and the second contact box reacts most quickly, sensitively and directly;

[0016] 2. When the detection rotor deflects too much and affects the state of the electrorheological fluid in the side slots, the middle slots and the return slots, the present invention can stop the resetting in time. This also indicates that the dynamic balance of the detection rotor is poor and needs to be corrected to a large extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a rotor balance detection device for a three-phase asynchronous motor proposed by the present invention;

[0018] Figure 2 It is a three-dimensional installation diagram of the linkage mechanism;

[0019] Figure 3 It is a schematic diagram of the side plane structure of the linkage mechanism;

[0020] Figure 4 It is the installation diagram of the centrifugal mechanism;

[0021] Figure 5 It is a schematic diagram of the installation of the horizontal contact mechanism, the upper vertical contact mechanism, and the lower vertical contact structure;

[0022] Figure 6 It is a structural schematic diagram of the horizontal contact mechanism;

[0023] Figure 7 is a schematic diagram of the internal structure of the horizontal contact mechanism;

[0024] Figure 8 Schematic diagram of the internal structure of the first contact box.

[0025] In the figure: 1 body, 2 bracket, 3 driving shaft, 4 mounting ring, 5 turntable, 6 support column, 7 horizontal contact mechanism, 8 rotating shaft, 9 upper vertical contact mechanism, 10 detection rotor, 11 lower vertical release mechanism, 12 rotating ring, 13 block, 14 outer magnet, 15 card slot, 16 guide rod, 17 inner magnet, 18 centrifugal spring, 19 card block, 20 return groove, 21 linkage rod, 22 first contact box, 23 first moving piece, 24 slide slot, 25 floating bar, 26 blocking piece, 27 middle slot, 28 first movable plate, 29 third contact box, 30 wire, 31 side slot, 32 second movable plate, 33 second contact box, 34 suspension block, 35 second moving piece, 36 blocking slot. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] Reference Figure 1-Figure 8 , a rotor balance detection device for a three-phase asynchronous motor, comprising a body 1, the body 1 is fixedly connected to a drive shaft 3 through the driving end of the motor, a bracket 2 is arranged on the drive shaft 3, and a linkage mechanism is installed on the bracket 2;

[0028] A mounting ring 4 is provided at one end of the driving shaft 3 away from the body 1, and the driving shaft 3 is connected to the mounting ring 4 through a centrifugal mechanism. A turntable 5 is rotatably connected in the mounting ring 4, and a rotating shaft 8 is fixedly connected to the turntable 5. A detection rotor 10 is sleeved on the rotating shaft 8. A support column 6 is provided below one end of the rotating shaft 8 away from the turntable 5, and the support column 6 is used to support one end of the rotating shaft 8. The detection rotor 10 is arranged between the support column 6 and the turntable 5;

[0029] An upper vertical contact mechanism 9 is arranged above the detection rotor 10, a lower vertical contact mechanism 11 is arranged below the detection rotor 10, and horizontal contact mechanisms 7 are arranged on both sides of the detection rotor 10. The upper vertical contact mechanism 9 includes a first contact box 22, the horizontal contact mechanism 7 includes two second contact boxes 33, and the lower vertical contact mechanism 11 includes a third contact box 29. One side of the first contact box 22, the second contact box 33, and the third contact box 29 are all in contact with the surface of the detection rotor 10.

[0030] The linkage mechanism includes a guide rod 16, a pair of inner magnets 17, and a pair of outer magnets 14. The pair of inner magnets 17 are symmetrically fixedly connected to the surface of the drive shaft 3. The pair of outer magnets 14 and the pair of inner magnets 17 are symmetrically arranged at the same height. The guide rod 16 is arranged between the outer magnet 14 and the inner magnet 17. The magnetic poles of the sides facing each other of the outer magnet 14 and the inner magnet 17 are opposite. The magnetic poles of the sides facing each other of the two outer magnets 14 are the same. The magnetic poles of the sides facing each other of the two inner magnets 17 are also the same. The outer magnet 14 and the guide rod 16 are fixedly connected to the bracket 2. When the motor in the body 1 drives the driving shaft 3 to rotate through the driving end, the driving shaft 3 will drive the two inner magnets 17 to rotate. When the inner magnet 17 rotates, there are magnetic flux lines between the outer magnet 14 and the inner magnet 17 facing each other with opposite poles on one side. The guide rod 16 is stationary and the guide rod 16 will passively cut the magnetic flux lines, so that current will be generated on the guide rod 16. Since the two sides are symmetrically arranged, the current generated by the cutting of the magnetic fields on both sides has the same direction, and the generated current will be transmitted to the horizontal contact mechanism 7, the upper vertical contact mechanism 9, and the lower vertical contact mechanism 11.

[0031] The centrifugal mechanism includes a rotating ring 12, a block 13 and a centrifugal spring 18 fixedly connected to the four sides of the block 13. The rotating ring 12 is rotatably mounted on the mounting ring 4. The rotating ring 12 is fixedly connected to the turntable 5. The block 13 is fixedly connected to one end of the driving shaft 3. The block 13 is arranged inside the rotating ring 12. Each centrifugal spring 18 is fixedly connected to a clamping block 19 at one end away from the block 13. A clamping groove 15 for clamping the clamping block 19 is provided on the inner wall of the rotating ring 12. When the driving shaft 3 rotates rapidly, the block 13 is connected to the clamping block 19 through the centrifugal spring 18. The clamping block 19 will be affected by the centrifugal force and thus move away from the block 13. As the driving shaft 3 rotates, the block 19 will move away from the block 13. The block 19 away from the block 13 will be snapped into the slot 15, and the four blocks 19 will be snapped into the four slots 15 respectively, thereby connecting the drive shaft 3 to the rotating ring 12, and rotating the rotating ring 12 together with the drive shaft 3, and finally driving the detection rotor 10 to rotate through the rotating ring 12. Since the drive shaft 3 is connected to the detection rotor 10 through an elastic centrifugal spring 18, if the detection rotor 10 has a deflection problem during rotation, the unbalanced state of the rotating ring 12 will affect the centrifugal spring 18, and the centrifugal spring 18 will react on the detection rotor 10, so that the deflection of the detection rotor 10 is more obvious and easier to detect.

[0032] The upper vertical contact mechanism 9 also includes a return groove 20, and linkage rods 21 are symmetrically fixedly connected on both sides above the first contact box 22. The linkage rods 21 are inserted into the return groove 20, and the return groove 20 is filled with variable current electro-hydraulic, and the first contact box 22 is also filled with variable current electro-hydraulic. A first moving piece 23 is arranged in the first contact box 22, and slide grooves 24 for the first moving piece 23 to move up and down are arranged on the inner walls at both ends of the first contact box 22. A floating bar 25 and a baffle 26 are arranged in the middle of the first moving piece 23. The floating bar 25 makes the first moving piece 23 suspended in the first contact box 22, and the baffle 26 is used to increase the amplitude of the shaking of the variable current electro-hydraulic. The return groove 20 is connected to the linkage mechanism through a wire 30. When the detection rotor 10 deviates upward during rotation, When the first contact box 22 moves, it will collide with the lower surface of the first contact box 22, thereby causing the linkage rod 21 and the first contact box 22 to move upward as a whole. The first contact box 22 is filled with liquid and is provided with a suspended first movable sheet 23. Under the action of inertia, the first movable sheet 23 and the liquid will move relative to the first contact box 22. The initial relative displacement of the first movable sheet 23 and the first contact box 22 reflects the degree of upward deflection of the detection rotor 10, and the degree of fluctuation of the first movable sheet 23 repeatedly shaking up and down in the first contact box 22 reflects the intensity of the upward deflection of the detection rotor 10. The relative position of the baffle 26 in the first contact box 22 can be accurately measured by a sensor, and this technology will not be explained in detail here.

[0033] The lower vertical contact mechanism 11 also includes an intermediate groove 27, and the lower end of the third contact box 29 is fixedly connected to the first movable plate 28, and the first movable plate 28 is inserted in the intermediate groove 27. The third contact box 29 is filled with variable current fluid, and the first movable plate 23 slides up and down in the third contact box 29. When the detection rotor 10 deflects downward, the third contact box 29 is pushed downward, and the third contact box 29 will be in a relative position with the first movable plate 23 inside. The degree of downward deflection is determined by measuring the distance of the initial relative displacement, and the force of the downward deflection is determined by the frequency of the first movable plate 23 repeatedly moving up and down in the third contact box 29.

[0034] The lower vertical contact mechanism 11 also includes a side groove 31, which is filled with variable current electro-hydraulic, and the side away from the detection rotor 10 is an inclined surface, the lower end of the second contact box 33 is fixedly connected to the second movable plate 32, the second movable plate 32 is inserted in the side groove 31, and the lower end of the second movable plate 32 is provided with a counterweight, the second contact box 33 is filled with variable current electro-hydraulic, and a second movable sheet 35 is suspended inside, when the detection rotor 10 deflects left and right, it will directly collide with the second contact box 33, thereby causing the second contact box 33 to move outward, and under the action of inertia, the second movable sheet 35 will be horizontally positioned relative to the second contact box 33, and the degree of left or right deflection is determined by measuring the initial horizontal displacement, and the degree of the second movable sheet 35 swinging back and forth in the second contact box 33 reflects the strength of the left and right deflection.

[0035] The second contact box 33 includes a shallow part and a deep part. A retaining groove 36 is provided on a side of the second movable sheet 35 located at the shallow part and away from the detection rotor 10. The opening of the retaining groove 36 faces the side of the detection rotor 10. A suspension block 34 is provided below the deep end of the second movable sheet 35. The deep end of the second movable sheet 35 is arranged opposite to the detection rotor 10. The suspension block 34 is used to keep the second movable sheet 35 balanced so that it can move back and forth horizontally in the second contact box 33. A retaining groove 36 is provided on a side opposite to the second movable sheet 35 to counteract the liquid and increase the amplitude of the back and forth movement of the second movable sheet 35, thereby amplifying the degree of deflection.

[0036] A contact is provided at the lower end of the first contact box 22, and a contact piece used in conjunction with the contact is provided in the return groove 20. The contact piece in the return groove 20 is located at an upper position. A connection point is provided in the middle groove 27 and on the side groove 31 on the inclined surface. The connection point is located above the liquid surface of the electrorheological fluid. The return groove 20, the middle groove 27, and the linkage rod 21 are all electrically connected to the linkage mechanism through the wire 30. When the contact point contacts the contact piece, the return groove 20 is energized. When the variable current fluid contacts the connection point, the side groove 31 and the middle groove 27 are energized, and the variable current fluid is energized. After that, it will change from liquid to solid, and the internal stress of the liquid will dissipate due to the change of physical state. When the two inner magnets 17 rotate to the vertical position, the power will be cut off, and the current will disappear. The electrorheological fluid will change from solid to liquid, and the second movable plate 32 will be reset under the action of the counterweight, the first movable plate 28 and the linkage rod 21 will be reset under the action of their own buoyancy, the first movable sheet 23 will be reset under the action of the floating bar 25, and the second contact box 33 will be reset under the action of the suspension block 34, wherein the side groove 31, the middle groove 27, and the return groove 20 are not in contact with each other.

[0037] The detection rotor 10 is fixedly mounted on the rotating shaft 8 from one end of the rotating shaft 8, the upper vertical contact mechanism 9 is mounted above the detection rotor 10, the horizontal contact mechanism 7 is arranged on both sides of the detection rotor 10, the lower vertical contact mechanism 11 is located below the detection rotor 10, and a disassembly structure is inserted between the linkage rod 21 and the return groove 20. The lower end of the first contact box 22 contacts the surface of the detection rotor 10, the upper end of the third contact box 29 contacts the surface of the detection rotor 10, and the left and right second contact boxes 33 contact the surface of the detection rotor 10.

[0038] The motor in the body 1 drives the block 13 to rotate through the driving shaft 3. As the block 13 rotates, under the action of centrifugal force, each centrifugal spring 18 will be stretched and rotate with the driving shaft 3, and the block 19 connected to the end of each centrifugal spring 18 will be inserted into the slot 15, finally connecting the driving shaft 3 and the rotating ring 12 together, so that the rotating ring 12 rotates synchronously with the driving shaft 3, and the rotating ring 12 drives the detection rotor 10 to rotate through the turntable 5 and the rotating shaft 8, and then the detection rotor 10 is balanced.

[0039] When the driving shaft 3 rotates, it will drive the inner magnet 17 connected to its surface to rotate. There is a magnetic field between the outer magnet 14 and the inner magnet 17, and the directions of the magnetic fields on the left and right sides are opposite. The currents generated on the guide rod 16 are in the same direction. The magnetic field range between the outer magnet 14 and the inner magnet 17 is limited. When the driving shaft 3 rotates, the current on the guide rod 16 is intermittent, and the generated current is used to quickly reset each contact mechanism.

[0040] When the detection rotor 10 rotates, the upward deflection will directly act on the first contact box 22, causing it to move suddenly upward. Under the action of inertia, the first movable sheet 23 remains stationary in the liquid while the first contact box 22 moves upward. The initial relative displacement between the first contact box 22 and the first movable sheet 23 is the degree of upward deflection of the detection rotor 10. The first contact box 22 is filled with liquid. The self-resetting process is achieved by moving back and forth up and down until it gradually returns to its original state. If the force of the upward deflection contact is large, the energy transmitted to the first contact box 22 is also large, and the frequency of the up and down shaking of the first movable sheet 23 is also high, indicating that the deflection force is large.

[0041] When the detection rotor 10 rotates, the downward deflection will directly affect the third contact box 29. The initial relative displacement between the first movable piece 23 in the third contact box 29 and the third contact box 29 reflects the degree of downward deflection, and the frequency of the first movable piece 23 resetting up and down shaking is the force of the downward deflection.

[0042] When the detection rotor 10 rotates, deflection to the left or right will directly exert force on the second contact box 33. The initial relative displacement between the internal second moving piece 35 and the second contact box 33 is the degree of left and right deflection, and the frequency of the second contact box 33 resetting left and right shaking is the deflection force.

[0043] In a liquid environment, the internal pressure is equal everywhere, which can better reflect the direction of the force and react sensitively. The fluidity of the liquid also amplifies the magnitude of the force when colliding with each other. Among them, the liquid in the first contact box 22, the third contact box 29, and the second contact box 33 reacts most quickly, sensitively and directly. Within the error range, the impact on the side grooves 31, the middle grooves 27, and the return grooves 20 can be ignored. When the deflection angle of the detection rotor 10 is too large, affecting the state of the electrorheological fluid in the side grooves 31, the middle grooves 27, and the return grooves 20, the reset can be stopped in time. At this time, it also shows that the dynamic balance of the detection rotor 10 is poor, and the degree of correction required is large.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A rotor balance detection device for a three-phase asynchronous motor, comprising a body (1), characterized in that: The machine body (1) is fixedly connected to a drive shaft (3) via a drive end of a motor, a bracket (2) is provided on the drive shaft (3), and a linkage mechanism is installed on the bracket (2); A mounting ring (4) is provided at one end of the drive shaft (3) away from the machine body (1); the drive shaft (3) is connected to the mounting ring (4) via a centrifugal mechanism; a turntable (5) is rotatably connected inside the mounting ring (4); a rotating shaft (8) is fixedly connected to the turntable (5); a detection rotor (10) is sleeved on the rotating shaft (8); a support column (6) is provided below one end of the rotating shaft (8) away from the turntable (5); the support column (6) is used to support one end of the rotating shaft (8); and the detection rotor (10) is provided between the support column (6) and the turntable (5); An upper vertical contact mechanism (9) is arranged above the detection rotor (10), a lower vertical contact mechanism (11) is arranged below the detection rotor (10), and horizontal contact mechanisms (7) are arranged on both sides of the detection rotor (10), the upper vertical contact mechanism (9) includes a first contact box (22), the horizontal contact mechanism (7) includes two second contact boxes (33), and the lower vertical contact mechanism (11) includes a third contact box (29), and one side of the first contact box (22), the second contact box (33), and the third contact box (29) are all in contact with the surface of the detection rotor (10); The linkage mechanism comprises a guide rod (16), a pair of inner magnets (17), and a pair of outer magnets (14); the pair of inner magnets (17) are symmetrically fixedly connected to the surface of the drive shaft (3); the pair of outer magnets (14) and the pair of inner magnets (17) are symmetrically arranged at the same height; the guide rod (16) is arranged between the outer magnet (14) and the inner magnet (17); the magnetic poles of the sides facing each other of the outer magnet (14) and the inner magnet (17) are opposite; the magnetic poles of the sides facing each other of the two outer magnets (14) are the same; the magnetic poles of the sides facing each other of the two inner magnets (17) are also the same; the outer magnet (14) and the guide rod (16) are both fixedly connected to the bracket (2); The upper vertical contact mechanism (9) further comprises a return groove (20), linkage rods (21) are symmetrically fixedly connected to the upper two sides of the first contact box (22), the linkage rods (21) are inserted into the return groove (20), the return groove (20) is filled with variable current electric fluid, the first contact box (22) is also filled with variable current electric fluid, a first moving sheet (23) is arranged in the first contact box (22), sliding grooves (24) for the first moving sheet (23) to move up and down are arranged on the inner walls at both ends of the first contact box (22), a floating bar (25) and a baffle (26) are arranged in the middle of the first moving sheet (23), the floating bar (25) makes the first moving sheet (23) suspend in the first contact box (22), the baffle (26) is used to increase the amplitude of the shaking of the variable current electric fluid, and the return groove (20) is connected to the linkage mechanism via a wire (30); The lower vertical contact mechanism (11) further comprises an intermediate groove (27), a first movable plate (28) is fixedly connected to the lower end of the third contact box (29), the first movable plate (28) is inserted into the intermediate groove (27), the third contact box (29) is filled with variable current liquid, a first movable plate (23) is slidable up and down in the third contact box (29), the lower vertical contact mechanism (11) further comprises a side groove (31), the side groove (31) is filled with variable current liquid, and a side away from the detection rotor (10) is an inclined surface, the lower end of the second contact box (33) is fixedly connected to the second movable plate (32), the second movable plate (32) is inserted into the side groove (31), a counterweight is arranged at the lower end of the second movable plate (32), the second contact box (33) is filled with variable current liquid, and a second movable plate (35) is suspended inside.

2. The rotor balance detection device for a three-phase asynchronous motor according to claim 1, characterized in that: The centrifugal mechanism comprises a rotating ring (12), a block (13) and centrifugal springs (18) fixedly connected to four side surfaces of the block (13); the rotating ring (12) is rotatably mounted on a mounting ring (4); the rotating ring (12) is fixedly connected to a rotating disk (5); the block (13) is fixedly connected to one end of a driving shaft (3); the block (13) is arranged inside the rotating ring (12); one end of each centrifugal spring (18) away from the block (13) is fixedly connected to a clamping block (19); and a clamping groove (15) for clamping the clamping block (19) is provided on the inner wall of the rotating ring (12).

3. The rotor balance detection device for a three-phase asynchronous motor according to claim 1, characterized in that: The second contact box (33) comprises a shallow portion and a deep portion, a retaining groove (36) is provided on a side of an end of the second movable sheet (35) located at the shallow portion and away from the detection rotor (10), an opening of the retaining groove (36) faces a side of the detection rotor (10), a suspension block (34) is provided below an end of the second movable sheet (35) located at the deep portion, and the deep portion end of the second movable sheet (35) is arranged opposite to the detection rotor (10).

4. The rotor balance detection device for a three-phase asynchronous motor according to claim 3, characterized in that: A contact is provided at the lower end of the first contact box (22), a contact piece used in conjunction with the contact is provided in the return groove (20), the contact piece in the return groove (20) is located at an upper position, a connection point is provided in the middle groove (27) and on the side groove (31) on the inclined surface, the connection point is located above the liquid surface of the electrorheological fluid, and the return groove (20), the middle groove (27) and the linkage rod (21) are all electrically connected to the linkage mechanism via a wire (30).

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