CN111293925A - Method and device for stepped starting operation of high-power motor - Google Patents
Method and device for stepped starting operation of high-power motor Download PDFInfo
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- CN111293925A CN111293925A CN201811507183.0A CN201811507183A CN111293925A CN 111293925 A CN111293925 A CN 111293925A CN 201811507183 A CN201811507183 A CN 201811507183A CN 111293925 A CN111293925 A CN 111293925A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/54—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting two or more dynamo-electric motors
- H02P1/58—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting two or more dynamo-electric motors sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details
- H02P1/04—Means for controlling progress of starting sequence in dependence upon time or upon current, speed, or other motor parameter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention aims to provide a method and a device for starting and operating a high-power motor in a grading manner, which can be used for achieving the same torque, rotating speed and power of the high-power motor by directly starting a plurality of directly started medium and small power motors in sequence, and solving the problems of high price and defects of the conventional high-power motor in starting and operating. The invention is technically characterized in that the high-power motor is started in a grading way by connecting at least more than two middle and small-power motors 1, 2 and 3 … which can be directly started, the motors such as the motor 2 and the motor 3 … are outer rotor motors, each motor can realize soft start relative to the previous-stage motor, the torque of each motor is the same as that of the high-power motor, and the sum of the superposed rotating speeds n1+ n2+ n3 … of the motors connected with the motor 1, the motor 2 and the motor 3 … is equal to the rotating speed of the high-power motor.
Description
Technical Field
The invention relates to a method and a device for stepped starting operation of a high-power motor.
Background
When the high-power motor is started, the starting current is 5-8 times of the rated current, the voltage of the power grid is obviously reduced due to the overlarge starting current, the operation of other equipment of the same power grid is influenced, and the current protection is overhigh to trip and lose power. Direct starting can also cause damage and deformation of mechanical equipment, and high-power motors are mostly not allowed to be directly started. The starting mode of the motor comprises the following steps: the step-down starting, the starting of the autotransformer starter, the resistance type starting and the like cannot meet the starting and running requirements of the high-power motor.
The starting operation mode that present high-power motor adopted is that variable frequency power supply starts, and variable frequency power supply starts with 1 Hz when starting, and voltage is the minimum value too, and frequency voltage risees thereupon when variable frequency power supply improves, and the rotational speed also is increasing, and motor speed reaches the rated value when the frequency conversion transfers to 50 Hz, and this kind is better by variable frequency power supply starting performance, and high-power variable frequency power supply is expensive mainly, can bring the harmonic and influence the electromagnetic radiation of surrounding environment for the electric wire netting when starting operation. The maintenance cost is high, the number of faults is large, professional personnel are required to maintain the system, and high cost is brought to use.
Disclosure of Invention
The invention aims to provide a method and a device for starting and operating a high-power motor in a grading manner, which can be used for achieving the same torque, rotating speed and power of the high-power motor by directly starting a plurality of directly started medium and small power motors in sequence, and solving the problems of high price and defects of the conventional high-power motor in starting and operating.
The technical scheme adopted by the invention for solving the technical problem is as follows: the method for starting the high-power motor in a grading way is to start a plurality of medium and small power motors with the same torque as the high-power motor in a grading way, so that the total output torque is the same as the torque of the high-power motor. The sum of the rotating speeds of a plurality of medium and small power motors which are started by the high-power motor in a grading way is the same as the rotating speed of the high-power motor.
The invention is technically characterized in that: the first motor can adopt an inner rotor motor, and can also adopt an outer rotor motor to fix the stator on the engine base, the output shaft of the motor is connected with the outer shell of the second-stage outer rotor motor to rotate at the rotating speed of n1, the winding of the second-stage outer rotor motor is powered by a relay ring to enable the inner rotor to rotate at the rotating speed of n2, the rotating speed of the output shaft of the second-stage inner rotor on the basis of the first-stage rotating speed is n1+ n2, and the output shaft of the second-stage outer rotor motor is connected with the third-stage outer rotor motor. The third-stage outer rotor motor winding is powered by a relay ring, the rotating speed of the inner rotor motor is n3, and the total rotating speed of the output shaft of the third-stage outer rotor motor is n1+ n2+ n3 on the basis of the first-stage rotating speed and the second-stage rotating speed. As above, the multiple motors are started in stages, with the speed being the sum of the speeds of all the individual motors, to achieve the desired speed.
The invention relates to a motor connection mode for the graded start of a high-power motor, which comprises the following steps: the output shaft of the first-stage motor is concentrically and vertically connected with the outer shell of the second-stage outer rotor through a coupling, the first-stage motor and the second-stage motor are supported by a support frame, the output shaft of the second-stage inner rotor is connected with the outer shell of the third-stage outer rotor through the coupling and the support frame, the output shaft of the third-stage inner rotor is supported by the support frame and a bearing to output torque, and the multi-stage motor can be connected with the output torque by the same method.
The invention relates to a motor for the graded starting of a high-power motor, wherein each motor is in a soft starting transmission mode relative to a previous motor, a first motor is started by a star-delta switching device, other starting modes can also be adopted, and a winding of a second outer rotor motor is supplied with power by a second switching device through a relay ring. And when the rotating speed of the output shaft of the second-stage motor reaches the sum of the rotating speed n1 of the first-stage motor and the rotating speed n2 of the second-stage motor, namely n1+ n2, starting a third switching device to supply power to the third-stage outer rotor motor through a relay ring, wherein the rotating speed of the output shaft of the third-stage motor is the sum of the rotating speeds of the three motors, namely n1+ n2+ n3. The first-stage motor, the second-stage motor and the third-stage motor can be manually switched on and off, and power switches can be respectively started by time relays to realize automatic control.
The structure mode of the high-power motor in the invention can also be that the output shaft of the first-stage inner rotor motor is connected with the belt pulley of the outer shell of the second-stage outer rotor motor through a belt pulley or a synchronizing wheel, the belt pulley on the output shaft of the second-stage outer rotor motor is connected with the third-stage outer rotor motor, and a plurality of motors can be connected by the same method.
The invention also discloses a structure mode for the stepped starting of the high-power motor, which can be characterized in that a first-stage motor output shaft is concentrically and vertically connected with a second-stage outer rotor to rotate, a belt pulley arranged on the second-stage motor output shaft is connected with a third-stage outer rotor motor output shaft through a belt or a synchronous belt and is concentrically and vertically connected with a fourth-stage outer rotor motor output torque, and the structure mode can be connected with a plurality of motors by the same method.
In conclusion, the high-power motor of the invention is formed by connecting at least more than two medium and small power motors which can be directly started with output torque, the output torque of each medium and small power motor is the same, the rotating speed is low, the power of each motor is small, and the required starting current is also small, so that the required rotating speed is reached by the step starting of a plurality of motors through the superposition of the rotating speeds, the impact on the starting current of a power grid is reduced, each motor is soft-started, and good stability is provided for the operation of load equipment.
The invention is applied to the fields of metallurgy, mining, building materials, petrifaction, water supply and drainage, and the starting and operation of high-power motors such as water pumps, forced draft fans, ball mills and the like.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of the step start method and apparatus of a high power electric motor of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of the step start method and apparatus of the high power motor of the present invention;
FIG. 3 is a schematic diagram of a third embodiment of the staged startup method and apparatus for high power motors of the present invention;
FIG. 4 is a schematic diagram of a star-delta automatic start circuit of a single motor of the step start method and apparatus for a high-power motor of the present invention;
Detailed Description
The present invention further describes the structure and the operation principle of the step starting method and the device of the high power motor with reference to the attached drawings and the embodiment:
example 1:
as shown in fig. 1: the high-power motor is started in a grading way by connecting a motor 1, an outer rotor motor 2 and an outer rotor motor 3 with the same torque through a coupling, a relay ring and a support frame. The output shaft 13 of the motor 1 is concentrically and vertically connected with the motor shaft 14 of the outer rotor motor 2 through a coupling 7, the motor 1 is connected with the outer shell of the motor 2 through a support frame 9 and a bearing 17 by the coupling 7 of the output shaft 13, the rotating speed n1 of the motor 1 is synchronous with the rotating speed of the outer shell of the motor 2, the rotating speed of the inner rotor of the motor 2 is n2 when the motor 2 supplies power through the relay ring 5, the rotating speed of the output shaft 15 relative to the motor 1 is n1+ n2, the output shaft 15 of the motor 2 penetrates through the support frame 10 and is connected with the outer shell of the motor 3 through a coupling 8 and the motor shaft 16 of the motor 3 and is synchronous with the rotating speed, the winding of the motor 3 is supplied with power by the relay ring 6, the rotating speed of the inner rotor of the motor 3 is n3, the rotating speed of the output shaft 12, the same rotating speed, torque and power of a high-power motor can be obtained through the stepped direct starting of 3 motors, and the motor starting of the embodiment is shown in figure 1: the motor 1 can be powered by a manually operated power switch 100 through a cable 105, when the rotating speeds of the motor 1 and the outer shell of the motor 2 are equal, the manually operated power switch 101 energizes the winding of the motor 2 through a relay ring 5, and when the rotating speed of the output shaft of the outer rotor 2 is equal to the rotating speed of the outer shell of the motor 3, the manually operated power switch 102 energizes the winding of the motor 3 through the relay ring 6, so that the motor 3 outputs torque.
In the method for the graded starting of the high-power motor, the output shaft of the first-stage motor 1 is respectively connected with the motor 2 and the motor 3 through the one-way bearing when the graded starting is performed, when the rotor motors in the motor 2 and the motor 3 are not powered, the rotating speed of the total output shaft 12 is n1 as the rotating speed of the n1 motor, when the motor 1 and the motor 2 are powered, the rotating speed of the total output shaft 12 is n1+ n2, and when the motor 1, the motor 2 and the motor 3 are all powered, the rotating speed of the total output shaft is n1+ n2+ n3.
The motor of the embodiment is started as shown in fig. 1, when the motor 1 is powered by the power switch 100, the motor 2 and the motor 3 can be respectively started in sequence by the time relay 103 and the time relay 104, so as to realize the automatic control of the motor stepped start.
Example 2:
as shown in fig. 2: the motor with high-power graded start consists of a motor 1, a motor 2 and a motor 3 with the same torque, wherein the motor 1 is powered by a power switch 100, an output shaft 13 of the motor 1 is connected with a motor shaft 15 of the motor 2 through a belt pulley 18, a conveyor belt 20 and a belt pulley 19, the motor shaft 15 is connected with a shell of the motor 2, the rotating speed n1 of the output shaft 13 of the motor 1 is synchronous with the rotating speed of the shell of the motor 2, the motor 2 is powered by the power switch 101 through a relay ring 5 to a winding of the motor 2, the rotating speed of an inner rotor 2 is n2, the rotating speed of an output shaft 21 of the outer rotor motor 2 is n1+ n2, the output shaft 21 of the outer rotor motor 2 is connected with a motor shaft 25 through a belt pulley 22, a conveyor belt 23 and a belt pulley 24, the motor shaft 25 is connected with the shell of the motor 3 and is synchronous with the rotating speed of the output shaft 21 of, the motor output shaft 12 of the outer rotor motor 3 outputs a rotation speed n1+ n2+ n3.
The time relay 103 and the time relay 104 can be respectively started in sequence, so that the automatic control of the motor grading start is realized.
The motor of this embodiment 2 is started as shown in fig. 2, by manually operating the power switch,
example 3:
as shown in fig. 3: the motor started by high power in a grading way is composed of 4 motors with high power and the same torque, namely an inner rotor motor 1, an outer rotor motor 2, a motor 3 and a motor 4.
The output shaft 13 of the motor 1 is concentrically and vertically connected with the motor shaft 14 of the outer rotor motor 2 through the coupling 7, the motor shaft 14 is connected with the shell of the motor 2, and the rotating speed n1 of the motor 1 is synchronous with the rotating speed of the shell of the motor 2. When the motor 2 supplies power through the relay ring 5, the outer rotor motor 2 has an inner rotor rotating speed of n2, the output shaft 15 of the outer rotor motor 2 has a rotating speed of n1+ n2 relative to the motor 1, and the motor shaft 15 of the outer rotor motor 2 is connected with the motor shaft 16 of the outer rotor motor 3 through the belt pulley 18, the conveyor belt 20 and the belt pulley 19 and rotates synchronously. When the power switch supplies power to the relay ring 6, the outer shell of the motor 3 rotates at the rotating speed of n1+ n2+ n3. A motor shaft 17 connected to the outer housing of the outer rotor 3 is connected to an outer housing connecting shaft 21 of the outer rotor motor 4 through a coupling 20 and operates synchronously. When the power switch supplies power to the winding of the outer rotor motor 4 through the relay ring 22, the rotating speed of the inner rotor motor is n4, and the total rotating speed of the output shaft 12 of the outer rotor 4 is n1+ n2+ n3+ n 4.
The power supply started by a single medium-small motor with high-power stepped starting can be automatically started by adopting a star triangle, a circuit is shown in fig. 4, and the power supply current is converted into a KM delta circuit through a time delay relay after realizing star corner starting through an KMy circuit to realize the automatic starting of the star triangle. Autotransformer starter start, resistive start, etc. may also be employed.
In conclusion, two or more than two middle and low power motors which can be directly started can be adopted for grading the high-power motor, the same torque and rotating speed of the high-power motor can be achieved through the connection method, soft starting is achieved through starting of the motors, and equipment cannot be damaged and impact on a power supply cannot be caused.
It will be appreciated that modifications and variations are possible to those skilled in the art in light of the above teachings and are within the purview of the appended claims.
Claims (10)
1. The method and the device for the stepped starting operation of the high-power motor are characterized in that the stepped starting of the high-power motor is formed by connecting at least two middle and small power motors 1, 2 and 3 which can be directly started, the motors 2, 3 and the like are outer rotor motors, each motor can realize soft starting relative to the previous stage motor, the torque of the motors 1, 2 and 3 and the like is the same as that of the high-power motor, and the sum of the power of the motors 1, 2 and 3 is equal to that of the high-power motor.
2. The method and apparatus for staged startup operation of a high power motor according to claim 1, the output shaft 13 of the first motor 1 is connected with the outer shell of the second-stage outer rotor motor 2 to rotate at the rotating speed of n1, the winding of the second-stage outer rotor motor is powered by the relay ring 5 to ensure that the rotating speed of the inner rotor is n2, the rotating speed of the output shaft 15 of the inner rotor of the second stage relative to the first-stage motor 1 is n1+ n2, the output shaft of the second-stage external rotor motor is connected with a third-stage external rotor motor 3, the winding of the third-stage external rotor motor is supplied with power by a relay ring 6, the rotating speed of the inner rotor motor is n3, the total rotating speed of the output shaft of the third-stage outer rotor motor is n1+ n2+ n3. on the basis of the first-stage rotating speed and the second-stage rotating speed, the rotating speeds of the motors are the sum of the rotating speeds of all the single motors and are the same as the rotating speed of the high-power motor.
3. The method and the device for the stepped starting operation of the high-power motor according to claim 1, wherein the connection mode of the stepped starting motor of the high-power motor is as follows: an output shaft of a first-stage motor 1 is concentrically and vertically connected with an outer shell of a second-stage outer rotor motor 2 through a coupling 7, the motor 1 and the motor 2 are supported by a bearing 17 of a supporting frame 9, an output shaft 15 of an inner rotor of the motor 2 is connected with the outer shell of the outer rotor of the motor 3 through a coupling 8 and a supporting frame 10, an output shaft 12 of the inner rotor of the motor 3 is supported by the supporting frame and the bearing to output torque, and the multi-stage motor output torque can be connected by the same method.
4. The method and the device for the stepped starting operation of the high-power motor according to claim 1, wherein the power supply mode of the stepped starting motor of the high-power motor is as follows: the motor 1 is started by the star-delta automatic starting switch 100, or other voltage reduction starting modes can be adopted, the inner rotor winding of the outer rotor motor 2 is supplied with power by the second power switch 101 through the relay ring 5, when the rotating speed of the output shaft 15 of the outer rotor motor 2 reaches the sum of the rotating speed n1 of the motor 1 and the rotating speed n2 of the motor 2, namely n1+ n2, the third switching device 104 is started, the outer rotor motor 3 is supplied with power through the relay ring 6, the rotating speed of the output shaft 12 of the motor 3 is the sum of the rotating speeds of the three motors, namely n1+ n2+ n3, the motor 1, the motor 2 and the motor 3 can adopt manual key switches, and the time relays 103 and 104 can respectively start the switching devices 101 and 102 to realize automatic control.
5. The method and the device for the stepped starting operation of the high-power motor according to claim 1 are characterized in that the stepped starting of the high-power motor can also be realized by connecting the output shaft 13 of the motor 1 with the belt pulley 19 of the outer shell of the outer rotor motor 2 through the belt pulley 18 or a synchronous pulley, connecting the belt pulley 22 on the output shaft 21 of the outer rotor motor 2 with the output shaft 25 of the outer rotor motor 3 through the belt conveyor 23 and the belt pulley 24, and connecting a plurality of motors in the same way.
6. The method and the device for the stepped starting operation of the high-power motor according to claim 1 are characterized in that the stepped starting of the high-power motor can be realized by the structure that an output shaft 13 of the motor 1 is concentrically and vertically connected with the outer rotor motor 2 to rotate, an output shaft 15 of the motor 2 is provided with a belt pulley 18 and is connected with the outer rotor motor 3 through a belt 20 or a synchronous belt, an output shaft 17 of the motor 3 is concentrically and vertically connected with the output torque of the outer rotor motor 4, and a plurality of motors can be connected by the same method.
7. The method and the device for the stepped starting operation of the high-power motor according to claim 1 are characterized in that the output shaft of the first-stage motor 1 which is started in a stepped manner is respectively connected with the motor 2 and the motor 3 through a one-way bearing or a one-way ratchet, when the windings of the motor 2 and the motor 3 are not powered, the rotating speed of the total output shaft 12 is the same as that of the motor 1, when the motor 1 and the motor 2 are powered, the rotating speed of the output shaft 15 of the motor 2 is n1+ n2, when a plurality of motors are powered simultaneously, the rotating speed of the total output shaft 12 is the sum of n1+ n2+ n3., and the motor which is started in a stepped manner can be applied without adopting a one-way bearing when the forward rotation and the reverse rotation are required.
8. The method and apparatus for staged starting operation of high power motor according to claim 1, wherein the output shaft 13 of the motor 1 with the same torque is vertically connected concentrically with the motor shaft 14 of the external rotor motor 2 through the connector 7, the output shaft 15 of the external rotor motor 2 is connected with the external rotor motor 3 through the belt pulley 18, the conveyor belt 20 and the belt pulley 19, the output shaft 17 of the external rotor motor 3 is connected with the external rotor 4 through the coupling 20, when the motor 1, the motor 2, the motor 3 and the motor 4 are staged started, the total rotation speed is n1+ n2+ n3+ n4, and a plurality of motors can be connected to reach the required rotation speed through the connection.
9. The method and the device for the stepped start operation of the high-power motor according to claim 1 are characterized in that the torques of the plurality of motors of the stepped start motor 1, the motor 2, the motor 3, and the like are the same as the torque of the high-power motor.
10. The method and the device for the stepped starting operation of the high-power motor according to claim 1 are characterized in that a plurality of motors such as a small and medium-sized motor 1, a motor 2, a motor 3 and the like which are started in a stepped mode can be respectively suitable for being started by a low-power variable-frequency power supply, and the speed-regulating operation of the stepped starting motor can be realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811507183.0A CN111293925A (en) | 2018-12-10 | 2018-12-10 | Method and device for stepped starting operation of high-power motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811507183.0A CN111293925A (en) | 2018-12-10 | 2018-12-10 | Method and device for stepped starting operation of high-power motor |
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| CN111293925A true CN111293925A (en) | 2020-06-16 |
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| CN201811507183.0A Pending CN111293925A (en) | 2018-12-10 | 2018-12-10 | Method and device for stepped starting operation of high-power motor |
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| US5569986A (en) * | 1994-04-29 | 1996-10-29 | Rieter Ingolstadt Spinnereimaschinenbau Ag | Soft start control apparatus for drive motors of a rotor spinning machine |
| CN2817209Y (en) * | 2005-07-26 | 2006-09-13 | 天津市天锻压力机有限公司 | Frequency conversion start hydraulic press multi motor device |
| CN1905329A (en) * | 2005-07-25 | 2007-01-31 | 刘嵩 | Multi-stage three phase ac motor |
| CN201345582Y (en) * | 2009-01-17 | 2009-11-11 | 山东山博电机集团有限公司 | Multi-stage cascade alternating current servo motor |
| CN203537146U (en) * | 2013-09-18 | 2014-04-09 | 王惠民 | Motor combination driving device |
| CN203590093U (en) * | 2013-10-31 | 2014-05-07 | 贵阳铝镁设计研究院有限公司 | Multi-motor soft start circuit structure |
| CN204707060U (en) * | 2015-06-25 | 2015-10-14 | 中国船舶重工集团公司第七一二研究所 | A kind of multiple electric motors Soft Starting System peculiar to vessel |
| CN108964389A (en) * | 2018-08-31 | 2018-12-07 | 沈阳工业大学 | A kind of low-pressure high-power axial direction combination disc-type permanent magnet motor |
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2018
- 2018-12-10 CN CN201811507183.0A patent/CN111293925A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5569986A (en) * | 1994-04-29 | 1996-10-29 | Rieter Ingolstadt Spinnereimaschinenbau Ag | Soft start control apparatus for drive motors of a rotor spinning machine |
| CN1905329A (en) * | 2005-07-25 | 2007-01-31 | 刘嵩 | Multi-stage three phase ac motor |
| CN2817209Y (en) * | 2005-07-26 | 2006-09-13 | 天津市天锻压力机有限公司 | Frequency conversion start hydraulic press multi motor device |
| CN201345582Y (en) * | 2009-01-17 | 2009-11-11 | 山东山博电机集团有限公司 | Multi-stage cascade alternating current servo motor |
| CN203537146U (en) * | 2013-09-18 | 2014-04-09 | 王惠民 | Motor combination driving device |
| CN203590093U (en) * | 2013-10-31 | 2014-05-07 | 贵阳铝镁设计研究院有限公司 | Multi-motor soft start circuit structure |
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