CN104467557A - Method for regulating speed of DC motor - Google Patents
Method for regulating speed of DC motor Download PDFInfo
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- CN104467557A CN104467557A CN201410737472.5A CN201410737472A CN104467557A CN 104467557 A CN104467557 A CN 104467557A CN 201410737472 A CN201410737472 A CN 201410737472A CN 104467557 A CN104467557 A CN 104467557A
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- speed
- roller
- motor
- rotating speed
- direct current
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Abstract
The invention relates to a DC speed regulation continuous annealing unit, in particular to a method for regulating the speed of a DC motor. The method aims to solve the problem that a unit can not normally operate due to the fact that the rotation speeds of motors are matched after any motor in the unit is replaced. The method comprises the following steps that firstly, the theoretical rotation speeds of the unit at different linear speeds are calculated according to the diameter and the gear ratio of a roller arranged on the motor; secondly, the motor is started, the motor is made to rotate idly at a high speed for 3-7 minutes to eliminate the contact resistance of a DC motor brush; finally, the rotation speed of a driven roller is measured, the measured rotation speed of the driven roller and the theoretical rotation speed are compared, and the rotation speed of the driven roller is adjusted according to a comparison result. The method for regulating the speed of the DC motor is suitable for speed regulation of the DC motor.
Description
Technical field
The present invention relates to DC speed regulation and even move back unit, especially relate to the speed regulating method of direct current machine.
Background technology
Connecting in DC speed regulation moves back in unit, and usually, a transmission cabinet can be with at least two motors, and sometimes by band three motors, even four motors, such as, unit moves back in the company comprising VS-585 direct current speeder.According to formula N=U-IR/Ce ￠, under the prerequisite that U and Ce ￠ is constant, motor speed N depends on the internal resistance R of motor.When a transmission cabinet is with two motor M 1 and M2, and, a motor M 1 is only had with encoder in two motors, namely the home roll in jockey pulley, another motor M 2 is from roller, if changed the motor M 2 from roller, even if what change is the motor of same model, the internal resistance of new motor M 2 ' also can be different from the internal resistance of motor M 2, thus, the rotating speed of motor M 2 ' can be mutually far short of what is expected with the rotating speed of motor M 2, the rotating speed of motor M 1 and the rotating speed of motor M 2 ' there will be and not mate, cause band steel can produce scuffing through jockey pulley, when rotating speed does not seriously mate, unit even cannot run.
Summary of the invention
Technical problem to be solved by this invention is: after changing the arbitrary motor in unit, do not mate because the rotating speed between each motor there will be, unit cannot normally run.
For solving the problem, the invention provides the speed regulating method of direct current machine, comprising:
A. according to motor diameter with roller and gear ratio, calculate the theoretical rotational speed of unit under different linear velocity;
B. starter motor, makes motor fast idle 3 to 7 minutes, to eliminate the contact resistance of direct current motor brush;
C. measure the rotating speed from roller, compare from the measurement rotating speed of roller and described theoretical rotational speed, according to the rotating speed of comparative result adjustment from roller.
Particularly, in step C, make exciting current become large or diminish by the feedback potentiometer of amplifier on adjustment excitation plate, thus adjustment is from the rotating speed of roller.
Particularly, if from the measurement rotating speed of roller higher than theoretical rotational speed, then turn clockwise potentiometer, exciting current is made to become greatly to reduce the rotating speed from roller, if from the measurement rotating speed of roller lower than theoretical rotational speed, be then rotated counterclockwise potentiometer, make exciting current diminish to improve the rotating speed from roller.
Particularly, when the measurement rotating speed from roller is lower than theoretical rotational speed, the potentiometer and the given potentiometer that adjust amplifier diminish to make exciting current simultaneously.
Further, when exciting current cannot continue adjustment, and when needing continuation to change the size of exciting current, the lower limit of lower bound place value or the upper limit of high spacing value of exciting voltage on excitation plate is adjusted.
Further, when exciting voltage has reached smallest limit or maximum upper limit, and when needing to continue to adjust the rotating speed from roller, changed the size of exciting current by the position changing wire jumper on excitation plate.
Preferably, in step C, when from when the measurement rotating speed of roller and the difference of described theoretical rotational speed are within 8 turns, change the rotating speed from roller by the amount of bytes on adjustment excitation plate.
The invention has the beneficial effects as follows: after changing the motor in unit, according to method of the present invention, effectively can regulate the rotating speed of changed unit, the speed of service making the unit of replacing and the rotating speed of the unit do not changed keep mating consistent, effectively prevent unit rotating speed after replacing motor and do not mate and cause band steel in the problem that can produce scuffing through jockey pulley.
Embodiment
Below in conjunction with embodiment, technical scheme of the present invention is further described, it should be noted that embodiment is only used to help reader to understand technical scheme of the present invention better, not in order to limit the protection range of the claims in the present invention.
The present invention is directed to DC speed regulation to connect and to move back in unit a certain direct current machine wherein and cause clicking rotating speed in unit after changing and do not mate, thus the problem of influence zone steel quality, a kind of speed regulating method of direct current machine is provided, the method step is as follows: first, according to motor diameter with roller and gear ratio, calculate the theoretical rotational speed of unit under different linear velocity.Then, starter motor, makes motor fast idle 3 to 7 minutes, to eliminate the contact resistance of direct current motor brush.Finally measure the rotating speed from roller, compare from the measurement rotating speed of roller and described theoretical rotational speed, according to the rotating speed of comparative result adjustment from roller.
Embodiment
Below with the speed regulation process of example in detail DC motor speed-regulating method of the present invention.
1, the theoretical rotational speed of motor is calculated.According to motor diameter with roller, and the gear ratio of gear box, passes through formula
N＝V*i/пd
Calculate when different linear velocity, the rotating speed of the required running of motor.Wherein, i is gear ratio, and d is the diameter of roller, and V is the linear velocity of unit.The calculating of linear velocity can obtain appropriateness, can get several point near base speed more.Base speed above then every 5min/m get a point because at this moment excitation curve steepening, and what adopt in the control program of transmission is that every 5min/m gets a point.
2, to dismantle catcher, if jockey pulley is not with steel just need not disconnect hand, the rotating shaft of motor is pasted the reflective sheeting tested the speed, note removing old reflective sheeting originally.
3, DC Transmission cabinet service conditions is got out.The cooling blower of direct current machine also needs to run, and the condition of unit does not meet sometimes, also needs some MASTER conditions of short circuit to meet the condition of transmission cabinet.
4, speed no-load and high runs.Rush when motor has just changed to test the speed, first check whether the wiring of motor and installation put in place, carry out and confirm contact work.Then first allow motor fast idle 5 minutes, the contact resistance of direct current motor brush can be eliminated like this.The speed of no-load running remains on 90% of rated speed for good, and can measure several point to understand the steep of excitation curve.
5, the rotating speed of below base speed is adjusted.First, measure the rotating speed of below base speed, see and to differ with the theoretical value calculated, from practice, we find, are not exclusively more better close to theoretical value, sometimes during speed governing, measure rotating speed and theoretical rotational speed all very close to time (differing at 2 turns), at this moment have scuffing on the contrary when unit operation, reason is that the excitation of every block excitation plate has different hysteresis, and with motor smooth degree with roller surfaces also have relation.This wants exactissima diligentia to verify rotating speed in the process of speed governing.The rotating speed measured below in base speed if from roller (home roll oneself with encoder so its speed is exactly given speed, the adjustment of speed can with reference to the speed of home roll) speed higher, then need to adjust IFB (feedback potentiometer of the amplifier) potentiometer on the excitation plate in transmission cabinet, right hour hands rotating excitation voltage, exciting current is made to become large, from roller speed then reduce, if from the speed of roller lower than home roll time, otherwise then the potentiometer of IFB is rotated counterclockwise, sometimes also can come together to regulate exciting current in conjunction with IREF (the given potentiometer of amplifier).When adjusting the electric current of excitation plate, exciting current occurs sometimes to be adjusted motionless, the situation that namely can not tune up or can not turn down, at this moment the amplitude limit of the LLEVEL (low spacing) on adjustment excitation plate and HLEVEL (high spacing) is just needed, can by changing the bound of exciting voltage.If exciting current is still adjusted motionless, namely exciting current can not meet the demands, and just needs to try to find some other ways.At the option tie jumper of excitation plate Shang You tetra-road feedback resistance size, by changing the position of wire jumper, the size of the feedback resistance value on excitation plate can be changed, thus change the size of exciting current.And excitation plate is also reserved the position R100 that can be welded feedback resistance.Welding kesistance: R100=243/I (I is exciting current).
6, the points for attention of the rotating speed of more than base speed are adjusted.If the speed below base speed is adjusted differ in the scope of 8 turns with theoretical rotational speed, we just can adjust the speed of more than base speed, and the base speed of each motor is not necessarily completely equal.Can be determined by the C_TABLE in PLC program on line, below base speed, in C_TABLE, the amount of bytes of given excitation is all 10000.Then by PLC conversion be output into 6 volts of voltages go as excitation plate give determining voltage signal.When adjusting the speed of more than base speed, must note transmission armature voltage cashier's office in a shop, when the above speed of adjustment base speed, great changes will take place sometimes for armature voltage, even exceedes the limiting voltage of armature, and the temperature of such motor will rise very fast.This is because the adjustment of exciting voltage is effective to the speed of motor within the specific limits, if exceeded exciting current to adjust to obtain limit range, the speed adjustment of motor will meet the rate request of motor by heightening armature voltage.At this moment just adjustment exciting current is not simply wanted.May need to check excitation plate, or the speed below base speed is the need of readjusting.In normal the situation of weak-magnetic speed-regulating, armature voltage change is very little, and size equals Rated motor voltage.
Claims (7)
1. the speed regulating method of direct current machine, is characterized in that, comprises the following steps:
A. according to motor diameter with roller and gear ratio, calculate the theoretical rotational speed of unit under different linear velocity;
B. starter motor, makes motor fast idle 3 to 7 minutes, to eliminate the contact resistance of direct current motor brush;
C. measure the rotating speed from roller, compare from the measurement rotating speed of roller and described theoretical rotational speed, according to the rotating speed of comparative result adjustment from roller.
2. the speed regulating method of direct current machine as claimed in claim 1, is characterized in that, in step C, make exciting current become large or diminish, thus adjustment is from the rotating speed of roller by the feedback potentiometer of amplifier on adjustment excitation plate.
3. the speed regulating method of direct current machine as claimed in claim 2, it is characterized in that, if from the measurement rotating speed of roller higher than theoretical rotational speed, then turn clockwise potentiometer, exciting current is made to become greatly to reduce the rotating speed from roller, if from the measurement rotating speed of roller lower than theoretical rotational speed, be then rotated counterclockwise potentiometer, make exciting current diminish to improve the rotating speed from roller.
4. the speed regulating method of direct current machine as claimed in claim 2, it is characterized in that, when the measurement rotating speed from roller is lower than theoretical rotational speed, the potentiometer and the given potentiometer that adjust amplifier diminish to make exciting current simultaneously.
5. the speed regulating method of the direct current machine as described in claim 2 to 4 any one, it is characterized in that, when exciting current cannot continue adjustment, and when needing continuation to change the size of exciting current, adjust the lower limit of lower bound place value or the upper limit of high spacing value of exciting voltage on excitation plate.
6. the speed regulating method of direct current machine as claimed in claim 5, is characterized in that, when exciting voltage has reached smallest limit or maximum upper limit, and when needing to continue to adjust the rotating speed from roller, is changed the size of exciting current by the position changing wire jumper on excitation plate.
7. the speed regulating method of direct current machine as claimed in claim 1, is characterized in that, in step C, when from the measurement rotating speed of roller with when the difference of described theoretical rotational speed is within 8 turns, by the rotating speed of the amount of bytes change on adjustment excitation plate from roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410737472.5A CN104467557A (en) | 2014-12-05 | 2014-12-05 | Method for regulating speed of DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410737472.5A CN104467557A (en) | 2014-12-05 | 2014-12-05 | Method for regulating speed of DC motor |
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| Publication Number | Publication Date |
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| CN104467557A true CN104467557A (en) | 2015-03-25 |
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| CN201410737472.5A Pending CN104467557A (en) | 2014-12-05 | 2014-12-05 | Method for regulating speed of DC motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105662766A (en) * | 2015-12-30 | 2016-06-15 | 王丽娟 | Examination device for thoracic surgical diseases |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH660101A5 (en) * | 1983-05-27 | 1987-03-13 | Bbc Brown Boveri & Cie | Drive regulator for pivoting mechanisms |
| CN201639280U (en) * | 2010-04-23 | 2010-11-17 | 攀钢集团攀枝花钢钒有限公司 | Microcomputer bus protector automatically identifying running ways of bus |
| CN103872954A (en) * | 2012-12-18 | 2014-06-18 | 攀钢集团攀枝花钢钒有限公司 | Speed governing method after slave roller direct-current motor is replaced in tension roller for continuous annealing unit |
-
2014
- 2014-12-05 CN CN201410737472.5A patent/CN104467557A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH660101A5 (en) * | 1983-05-27 | 1987-03-13 | Bbc Brown Boveri & Cie | Drive regulator for pivoting mechanisms |
| CN201639280U (en) * | 2010-04-23 | 2010-11-17 | 攀钢集团攀枝花钢钒有限公司 | Microcomputer bus protector automatically identifying running ways of bus |
| CN103872954A (en) * | 2012-12-18 | 2014-06-18 | 攀钢集团攀枝花钢钒有限公司 | Speed governing method after slave roller direct-current motor is replaced in tension roller for continuous annealing unit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105662766A (en) * | 2015-12-30 | 2016-06-15 | 王丽娟 | Examination device for thoracic surgical diseases |
| CN107496127A (en) * | 2015-12-30 | 2017-12-22 | 劳伦迪勒（昆山）机械工程有限公司 | A kind of intelligent chest diseases check device |
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Application publication date: 20150325 |
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