外文翻译双闭环直流调速系统的说明.docx

1、外文翻译双闭环直流调速系统的说明Double Loop DC Speed Control System Description工 学 部 专 业自动化班 级学 号姓 名指导教师负责教师Double Loop DC Speed Control System Description.system analysis and synthesis1Analysis （1）In the speed and current dual closed-loop speed control system, in order to change the motor speed, what parameters sh

2、ould be regulating? Change speed regulator Kn magnification work? Power electronic converter to change the magnification factor Ks work? Change the speed of the feedback coefficient of work? To change the motors stall current system should adjust the parameters of what?A: To change the motor speed,

3、change speed regulator Kn magnification and power electronic converters will not work magnification factor Ks, stable when n = Un = Un *, so the only change in the value of a given coefficient of Un * and feedback before. To change the motors stall current, only need to change the same value given U

4、im * and feedback coefficient, because the stability, Uim * = Idm, can be drawn from the type (2) Speed, the current double closed-loop speed control system when the steady-state operation, the two regulator input voltage and output voltage deviation is the number? A: The speed and current dual clos

5、ed-loop speed control system when the steady-state operation, the two regulators are the input bias voltage is zero, by the formula n = Un = Un *, n = n; Uim * = Idm, Idm = Idl. (3) In the speed and current dual closed-loop speed control system, the two regulators are PI regulator. When the system i

6、s running with rated load, the speed feedback line suddenly disconnected, the system re-enter the steady-state, the current regulator is the input bias voltage to zero? Why? A: When the system is running with rated load, the speed feedback line suddenly disconnected, then Un = 0, = Un *- Un = Un *,

7、so that Ui to reach Uim, 0, rate of increase in n, when the system after re-entering the steady-state , that is, Id = Idl, then, = Uim *- Idl 0, are no longer changes, changes in rotational speed n is no longer, but at this time than the rotational speed n at the time of the feedback line speed to b

8、reak big. (4) Why is the speed with integral control system is not static poor? A: Speed regulator integral system, to achieve non-static error is due to the characteristics of integral control regulator, that is, the accumulation of points and the role of memory. (5) Double-loop speed control syste

9、m (PI), load changes, Idl Idm, asked bicyclol speed control system ASR and ACR how-conditioning, the result? A: When the load changes, Idl Idm, speed decreased rapidly, the current Id soon to Idm, and of limited amplitude, rapid rate of ASR saturation, ACR has been limiting conditions, to form a blo

10、cking phenomenon, long-running will damage the system.2. System Speed regulator and current regulator in the Double Loop DC Motor Control System can be summarized as follows: (1). The role of speed regulator Speed regulator is a speed control system of the dominant regulator, which allows speed n wi

11、ll soon change with a given voltage Un * changes in steady-state speed error can be reduced, if the PI regulator can achieve the non-static error. 1) The effect of load changes in the role of anti-disturbance. 2) The output amplitude of the decision limit the maximum allowable motor current. (2) The

12、 role of current regulator 1) As a regulator of the inner ring, outer ring at the speed of the adjustment process, it makes the current closely followed the given voltage Ui * (that is, the outer ring modulator output) changes. 2) Fluctuations in voltage from the role of disturbance rejection in tim

13、e. 3) The speed of the dynamic process of ensuring that the maximum allowable motor current, thereby speeding up the dynamic process. 4) When the motor overload or stall when the armature current limit of the maximum, automatic protection from the role of acceleration. Once the fault disappears, the

14、 system automatically return to normal. Yesterday, the role of the reliable operation is very important.double-loop speed control system common faults analysis 1.Introduction of a system (1). Double-loop speed control system components in Figure 1.1 Current loop: from the current regulator LT, trigg

15、er CF (input transformation for the CSR), silicon-controlled rectifier bridge, motor armature and current loop transform LB component. the speed of outer ring: the speed regulator from ST, current loop, such as link inertia, motor and load moment of inertia and the speed of transformation components

16、 SB. in the double-loop speed control system, the speed of the decision loop of the running characteristics of the whole system and stability, and play a leading role, and to change the current ring plays the role of the internal structure of the system is dependent, but since it is as a whole to pa

17、rticipate in the closed-loop speed to the speed of a direct impact on the work of the closed-loop, it must first good debugging current loop, and then testing the speed of outer ring, so that the whole system has good dynamic performance. (2). Double-loop speed control system of the typical working

18、condition 1) Start (or the speed): ST in the start-up process has been saturated, so that the speed of this loop in the equivalent open-loop state. System only in the constant current loop under the regulation to ensure the motor at a constant current of the maximum allowable under the start-up.Figu

19、re 1 double-loop speed control system structure2) slow down (or stop): ST at this time to reach the output amplitude of the reverse limit. Main circuit current by the bridge is reduced to zero after the inverter. LT and CSR output will soon reach the maximum reverse. CF pulse output to reach min, cu

20、rrent loop for open-loop. motor torque under deceleration until the motor speed close to the given new value, current loop and speed loop one after another into the closed-loop work, motor in the new value of a given run .3) Grid voltage fluctuation: This motor because of the larger moment of inerti

21、a, which caused the first change in armature current, ST output also did not change the effect of current loop, LT rapidly changing the output so that angle be adjusted quickly, so the impact on the speed .4）Small changes in load: in the operation, load changes, will cause the motor speed deviation

22、from the given value. speed up the recovery process and the aforementioned speed (or deceleration) is similar to the process.2. Common Fault Analysis and Processing (1) The normal supply voltage, thyristor rectifier output waveform arrhythmia caused by this phenomenon is due to trigger sawtooth slop

23、e caused inconsistency. Sawtooth slope adjust potentiometer, the output waveform uniformity could be achieved. in the adjustment process to strike a balance between Qi, this point should be paid attention to the actual debugging. (2) DC Motor Analysis of mechanical properties of soft thyristor DC mo

24、tor system, when the current intermittent mechanical properties when the first no-load speed is characterized by high ideals, and the second is characterized by mechanical properties of soft . The so-called mechanical features soft, that is, small changes in load will cause great changes in speed. o

25、scilloscope to observe when using the bridge rectifier output waveform, one may find that missing relative. at this time need to check whether the trigger has pulse output, fast whether the fuse melting, whether the breakdown or thyristor circuit, synchronous transformer is damaged, whether the lack

26、 of power. to identify the problems, can be resolved. (3) The speed of the speed of instability caused by many factors of instability: 1) Electric guns are not firmly fixed or with the host of different axis .2) The parameters of the speed regulator inappropriate. Respond to the dynamic parameters t

27、o adjust (change the ratio of integral parameters ) .3) Of a speed control system there are(or bad) 4) May be caused as a result of interference. should be found to interfere with the reasons for taking anti-jamming measures. (4) A little to the set rated motor speed is higher than that should first

28、 check whether it is normal for the external control system, such as outside the normal control system, it may be given points, speed regulator, current regulator, such as caused by link failure. Should be cut off the main circuit power supply, only the control system to the electricity, not a given

29、 in the case, testing each of the key points (such as the current regulator, voltage regulator, etc. of the potential. and then given together with the former to one by one after each of the key points to check the potential changes, you can find out the fault lies. (5) Bridge rectifier output volta

30、ge is not high stressed 1) the speed regulator and current regulator limiter too small, should be liberalizedin accordance with appropriate amplitude threshold .2) than the speed feedback signal, in that they can reduce the rate of appropriate feedback signals. (6) To the timing system still in the

31、absence of low-speed operation (that is, the phenomenon of emergence of reptiles) This is because the system of zero drift caused by. When the input signal is zero, the output voltage by the input amplification stage of the offset potentiometer decisions can be offset by adjusting the potential allo

32、ws = 90 , at this time to zero output voltage rectification system, the electrical will not crawl. (7) With a given system can not run Should first check whether it is normal for the external control system, such as outside the normal control system, it may be given points, speed regulator, currentregulator, such as caused by link failure. Shall be cut off main circuit power supply, only the control system to the electricity, not Add the given circumstances, the key points of each test (such as the current regulator, voltage regula