CN110729841A - Electric brush lifting device for wound three-phase asynchronous motor - Google Patents
Electric brush lifting device for wound three-phase asynchronous motor Download PDFInfo
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- CN110729841A CN110729841A CN201911078978.9A CN201911078978A CN110729841A CN 110729841 A CN110729841 A CN 110729841A CN 201911078978 A CN201911078978 A CN 201911078978A CN 110729841 A CN110729841 A CN 110729841A
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- short circuit
- brush
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/14—Means for supporting or protecting brushes or brush holders
- H02K5/141—Means for supporting or protecting brushes or brush holders for cooperation with slip-rings
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Abstract
An electric brush lifting device of a wound three-phase asynchronous motor is characterized in that two sides of a short circuit ring and a collecting ring on a motor spindle are respectively and symmetrically provided with an insulating screw rod, one end of a brush holder is fixed on the insulating screw rod, and a carbon brush is arranged at the other end of the brush holder; one end of the rotating handle is fixedly connected with the insulating screw rod, and the other end of the rotating handle is contacted with the outer edge of the cam through a rolling bearing; the cam is arranged in the box seat and is connected with the transmission shaft and the output shaft of the speed reducing motor; one end of the rocking handle is fixedly connected with the cam through a connecting rod, and a roller at the other end of the rocking handle is arranged in a groove on the outer side surface of the short circuit ring; the end part of the conductive screw on the collecting ring is provided with an inserting piece which is connected with a short circuit socket at the end part of the short circuit ring in a matching way. The invention has the characteristics of novel and simple structure, low manufacturing cost, reliable and stable performance and the like, and the carbon brush is not contacted with the slip ring in the continuous load operation stage of the motor, thereby avoiding the continuous abrasion of the electric carbon brush, and the carbon brush can not be replaced after the design service life range of the whole motor.
Description
Technical Field
The invention relates to a motor, in particular to an electric brush lifting device of a wound-rotor three-phase asynchronous motor.
Background
The three-phase wound asynchronous motor has additional resistor connected to the rotor loop via collecting ring and carbon brush, and this can reduce the starting current of the rotor and the stator. Therefore, the wound rotor motor can be directly started under a heavy-load working condition, and is widely applied to heavy-load equipment such as cement plants, mine metallurgy, crane machinery and the like.
After the three-phase wound asynchronous motor is started, the additional resistance connected in series in the rotor loop needs to be gradually reduced, and finally the additional resistance in the rotor loop is zero (namely, the three-phase coil of the rotor is short-circuited), so that the motor can run efficiently, which is usually realized by a water resistance cabinet (a liquid rheostat). Since the short-circuit point of the rotor circuit is located in the water resistance tank (liquid rheostat), the carbon brush and the slip ring must always be in reliable contact during the operation of the wound-rotor motor to transmit the rotor current and prevent the rotor circuit from three-phase imbalance or phase loss. The carbon brush is continuously worn and replaced by a regular shutdown in the continuous operation process of the carbon brush and the slip ring, the working surface of the slip ring is also worn or burnt by electric sparks to reduce the smoothness, so that the abrasion of the carbon brush is accelerated, carbon fine powder generated by the abrasion of the carbon brush is attached to the surface of an insulating material, the insulating property of the motor is reduced, and various insulation failures of the motor occur, such as alternate arc discharge of a collector ring, ground breakdown, carbon brush burning loss and the like, so that the wound rotor motor must be periodically shut down to clean carbon powder in the collector ring to maintain the safe operation of the motor.
The brush lifting device can carry out short circuit on the collector ring and separate the carbon brush from the collector ring after the motor is started, and the carbon brush is not in contact with the slip ring in the continuous load operation stage of the motor, so that continuous abrasion of the electric carbon brush, generation of carbon powder and reduction of insulation performance due to adhesion are avoided, and the carbon brush does not need to be replaced after the design service life of the whole motor. But is limited by the higher manufacturing cost of the brush lifting device, the market acceptance degree is not high, and the winding motor with the brush lifting function is not popularized and used in a large range.
Disclosure of Invention
The invention aims to provide an electric brush lifting device of a wound three-phase asynchronous motor, which has simple structure, low manufacturing cost and reliable and stable performance.
The invention discloses an electric brush lifting device of a wound three-phase asynchronous motor, which comprises a carbon brush, a short circuit ring, a collecting ring and a conductive screw rod, and is characterized in that the short circuit ring on a motor spindle and two sides of the collecting ring are respectively symmetrically provided with an insulating screw rod, the insulating screw rods are fixed in a box base through bearings, one end of a brush holder is fixed on the insulating screw rod, the carbon brush is arranged at the other end of the brush holder, the brush holder and the carbon brush rotate along with the insulating screw rods, and the carbon brush can be contacted with the outer side surface of the collecting ring; one end of the rotating handle is fixedly connected with the insulating screw rod, the other end of the rotating handle is contacted with the outer edge of the cam through a rolling bearing, two ends of a tension spring are respectively fixed on the middle part of the rotating handle and the box seat, and the rolling bearing at the end part of the rotating handle is always contacted with the end face of the cam through the tension force of the tension spring; the cam is arranged in the box seat and above the short circuit ring, the cam is connected with the transmission shaft, and the transmission shaft is connected with an output shaft of the speed reducing motor; the fulcrum of the rocking handle is fixed on the box seat, one end of the rocking handle is fixedly connected with the cam through a connecting rod, the other end of the rocking handle is provided with a roller, the roller is arranged in a groove on the outer side surface of the short circuit ring and is contacted with the end surface of the groove, and the lever motion of the rocking handle drives the short circuit ring to axially move on the main shaft of the generator; the end part of the conductive screw on the collecting ring is provided with an insertion piece, the end part of the short circuit ring opposite to the insertion piece on the conductive screw is provided with a short circuit socket, and the short circuit socket is connected with the insertion piece in a matching way.
The electric brush lifting device of the winding type three-phase asynchronous motor has the working principle that before the winding type three-phase asynchronous motor is started, the carbon brush is lifted, and the inserting pieces of the collecting ring are kept in a state of being inserted into a short circuit socket. When the motor is started, the motor control system sends a starting signal to the brush lifting device, the gear motor starts to drive the cam to rotate, the rolling bearing on the rotating handle keeps in contact with the outer edge of the cam under the action of the tension spring, when the cam rotates, the rotating radius of the contact point of the roller bearing is gradually increased, the roller bearing is pressed downwards to drive the rotating handle and the brush holder to rotate downwards, the carbon brush is gradually close to the collecting ring, and when the cam rotates by about 60 degrees to the maximum radius, the carbon brush is pressed to the lowest position and keeps in full contact with the collecting ring. Meanwhile, when the cam rotates, the connecting rod drives the rocking handle to push the short circuit ring to move leftwards through the roller bearing, and the short circuit socket is gradually separated from the inserting sheet; when the cam rotates about 220 degrees, the roller bearing at the lower end of the rocking handle pushes the short circuit ring to reach the position farthest away from the collecting ring, the cam continues to rotate, the roller bearing at the lower end of the rocking handle starts to move rightwards to be away from the leftmost side of the short circuit ring groove, when the cam rotates for 260 degrees, the travel switch triggers a stop signal, the speed reduction motor stops rotating, and the roller bearing is kept at the middle position of the groove of the short circuit ring and is not in any contact with the short circuit ring. The short circuit ring is separated from the collecting ring, the carbon brush is kept in contact with the collecting ring, the water resistance cabinet (liquid resistance cabinet) is connected in series with a motor rotor loop, the travel switch sends a signal that the motor can be started to the motor control system, the system receives the signal and then transmits power to the motor, and the motor is started in the state of being connected in series with the water resistance cabinet. And after the motor is started to reach the rated rotating speed, the resistance value in the water resistance cabinet is gradually reduced, and finally, the three phases of the motor rotor are subjected to short circuit in the water resistance cabinet. After the short circuit of the water resistance cabinet is completed, the motor control system sends an operation signal to the brush lifting device, the speed reducing motor starts to drive the cam to rotate reversely, and the connecting rod drives the rocking handle to push the short circuit ring and the short circuit socket to gradually approach the insertion piece through the roller bearing; when the cam reversely rotates by about 120 degrees, the roller bearing at the lower end of the rocking handle pushes the short circuit ring and the short circuit socket to start to contact with the inserting sheet, when the cam reversely rotates by about 190 degrees, most of the inserting sheet is inserted into the short circuit socket, the collecting ring is in a short circuit state, the radius of a contact point of the cam and the roller bearing is reduced, the carbon brush starts to be separated from the collecting ring, when the cam reversely rotates by about 220 degrees, the roller bearing reaches the rightmost end of the stroke, the insertion depth of the collecting ring inserting sheet and the short circuit ring socket is maximized, the distance between the carbon brush and the collecting ring is gradually increased, the roller bearing returns to the center of the short circuit ring groove from the left side, and no contact is made with the short circuit ring; the travel switch triggers a stop signal, the speed reducing motor stops rotating, the maximum insertion depth of the collecting ring inserting piece and the short circuit ring socket is kept, and the carbon brush reaches the position with the maximum distance from the collecting ring.
The electric brush lifting device of the wound-rotor three-phase asynchronous motor has the characteristics of novel and simple structure, low manufacturing cost, reliable and stable performance and the like, and the carbon brush is not in contact with the slip ring in the continuous load operation stage of the motor, so that the continuous abrasion of the electric carbon brush is avoided, and the carbon brush does not need to be replaced after the design service life of the whole motor.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic side cross-sectional view of FIG. 1;
FIG. 3 is a schematic view of another operating state of FIG. 1;
FIG. 4 is a schematic view of a connection structure of a part of the rotating shaft, the carbon brush, the brush holder, the rotating handle and the cam in FIG. 1;
1. the box cover comprises a box cover body 2, a box base 3, a cam 4, a connecting rod 5, a rocking handle 6, a short circuit ring 7, a short circuit socket 8, an inserting piece 9, a collecting ring 10, a conductive screw rod 11, a carbon brush 12, a rotating handle 13, a roller 14, a tension spring 15, a brush frame 16, an insulating screw rod 17, a speed reducing motor 18 and a transmission shaft.
Detailed Description
An electric brush lifting device of a wound three-phase asynchronous motor comprises a carbon brush 11, a short circuit ring 6, a collecting ring 9 and a conductive screw 10, and is characterized in that two sides of the short circuit ring 6 and the collecting ring 9 on a motor spindle are respectively and symmetrically provided with an insulating screw 16, the insulating screws 16 are fixed in a box base 2 through bearings, one end of a brush holder 15 is fixed on the insulating screw 16, three brush holders 15 are fixed on each insulating screw 16, the carbon brush 11 is arranged at the other end of the brush holder 15, the brush holder 15 and the carbon brush 11 rotate along with the insulating screw 16, and the carbon brush 11 can be contacted with the outer side face of the collecting ring 9; one end of the rotating handle 12 is fixedly connected with the insulating screw 16, the other end of the rotating handle is contacted with the outer edge of the cam 3 through a rolling bearing, and two ends of the tension spring 14 are respectively fixed on the middle part of the rotating handle 12 and the box base 2; the cam 3 is arranged in the box seat 2 and above the short circuit ring 6, the cam 3 is connected with a transmission shaft 18, and the transmission shaft 18 is connected with an output shaft of a speed reducing motor 17; the fulcrum of the rocking handle 5 is fixed on the box base 2, one end of the rocking handle 5 is fixedly connected with the cam 3 through the connecting rod 4, the other end of the rocking handle 5 is provided with a roller 13, and the roller 13 is arranged in a groove on the outer side surface of the short circuit ring 6 and is contacted with the end surface of the groove; the end part of a conductive screw rod 10 on the collecting ring 9 is provided with an inserting piece 8, the end part of a short circuit ring 6 opposite to the inserting piece 8 on the conductive screw rod 10 is provided with a short circuit socket 7, and the short circuit socket 7 is connected with the inserting piece 8 in a matching way.
Claims (4)
1. The utility model provides an electronic brush device of lifting of wound-rotor type three-phase asynchronous motor, includes carbon brush (11), short circuit ring (6), collecting ring (9), conductive screw (10), its characterized in that: two sides of a short circuit ring (6) and two sides of a collecting ring (9) on a motor spindle are respectively and symmetrically provided with an insulating screw (16), one end of a brush holder (15) is fixed on the insulating screw (16), a carbon brush (11) is installed at the other end of the brush holder (15), the brush holder (15) and the carbon brush (11) rotate along with the insulating screw (16), and the carbon brush (11) can be contacted with the outer side face of the collecting ring (9); one end of the rotating handle (12) is fixedly connected with the insulating screw rod (16), and the other end of the rotating handle is contacted with the outer edge of the cam (3) through a rolling bearing; the cam (3) is arranged in the box seat (2) and above the short circuit ring (6), the cam (3) is connected with the transmission shaft (18), and the transmission shaft (18) is connected with an output shaft of the speed reducing motor (17); the fulcrum of the rocking handle (5) is fixed on the box base (2), one end of the rocking handle (5) is fixedly connected with the cam (3) through the connecting rod (4), the other end of the rocking handle (5) is provided with a roller (13), and the roller (13) is arranged in a groove on the outer side surface of the short circuit ring (6) and is contacted with the end surface of the groove; the end part of a conductive screw rod (10) on the collecting ring (9) is provided with an inserting piece (8), the end part of a short circuit ring (6) opposite to the inserting piece (8) on the conductive screw rod (10) is provided with a short circuit socket (7), and the short circuit socket (7) is matched and connected with the inserting piece (8).
2. The wound-rotor, three-phase, asynchronous motor, electric brush-lifting apparatus as recited in claim 1, further comprising: the insulating screw rod (16) is fixed in the box seat (2) through a bearing.
3. The wound-rotor, three-phase, asynchronous motor, electric brush-lifting apparatus as recited in claim 1, further comprising: three brush holders (15) are fixed on each insulating screw rod (16).
4. The wound-rotor, three-phase, asynchronous motor, electric brush-lifting apparatus as recited in claim 1, further comprising: two ends of the tension spring (14) are respectively fixed on the middle part of the rotating handle (12) and the box seat (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911078978.9A CN110729841A (en) | 2019-11-07 | 2019-11-07 | Electric brush lifting device for wound three-phase asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911078978.9A CN110729841A (en) | 2019-11-07 | 2019-11-07 | Electric brush lifting device for wound three-phase asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110729841A true CN110729841A (en) | 2020-01-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911078978.9A Pending CN110729841A (en) | 2019-11-07 | 2019-11-07 | Electric brush lifting device for wound three-phase asynchronous motor |
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| Country | Link |
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| CN (1) | CN110729841A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115007970A (en) * | 2022-08-04 | 2022-09-06 | 长治市三耐铸业有限公司 | Rotary conductive device for vertical mill wear-resistant part surfacing platform |
-
2019
- 2019-11-07 CN CN201911078978.9A patent/CN110729841A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115007970A (en) * | 2022-08-04 | 2022-09-06 | 长治市三耐铸业有限公司 | Rotary conductive device for vertical mill wear-resistant part surfacing platform |
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