05 Aug
Right here, we’ll present an increase selection approach based on the volume effect of the program
Regarding Eq. (2.28) , it may be viewed your current-control trait relies on new efficiency of latest operator, which can be determined by the fresh new P and i also gains picked for the PI control.
2.six.step one Proportional–Inbuilt Most recent Controller
A recently available control program who has a good PI operator is shown in the Fig. 2.thirty-two . Right here, believe that the fresh feedforward control makes up the rear-EMF of your DC engine well.
where T p i ( = K p c / K we c ) is the built-in go out ongoing of one’s PI current operator and K we c is the integral acquire.
There are PI acquire tuning guidelines including the well-known Ziegler–Nichols strategy. Here, we are going to embrace the technique known as rod-zero cancellation approach. With the rod-no termination, we could take away the current-control attribute of the DC motor by itself therefore, the PI control can get influence the brand new efficiency out-of the present day handle.
Whether your zero ( ? K i c / K p c ) of your own PI controller is designed to terminate brand new rod ( ? R a good / L good ) of your DC system by rod-no termination https://datingranking.net/es/citas-adventistas/ strategy, we.age.
Fig. 2.33 suggests the new bode area of your own open-circle volume impulse off G c o ( s ) . The fresh phase is ?90° at obtain get across-more than volume ? c c where in actuality the magnitude | Grams c o ( j ? ) | = 0 dB . For this reason the newest get margin was self-confident therefore the system is steady. Along with, in this instance, brand new transfer reason for Eq. (dos.32) becomes the computer away from style of=step 1 and you can, thus, we are able to predict the fresh regular-county error getting zero since the
The acquire mix-more frequency ? c c of the discover-cycle volume answer is equal to the newest get cut-away from regularity of intimate-cycle volume response, and this implies the bandwidth of the current-control program. Let’s check the bandwidth for the current-control system.
Their frequency answer is shown inside the Fig. 2.34 . We could observe that the latest bandwidth from the system is provided since ? c c by allowing | G c c ( j ? ) | comparable to 1 / 2 (=?step 3 dB) once the
Such as this, when your no of your own PI control was designed to cancel the latest pole of your own system, the modern manage experience indicated merely due to the fact a primary-order program having a cut-out-from frequency ? c c , that’s stable. In this instance, there won’t be any overshoot in the reaction and go out you’ll need for the answer to reach the latest worth could be throughout the 4 times the amount of time constant of the program.
Based on the reasons given above, new proportional and you may built-in increases of your own most recent controller necessary to reach the called for data transfer might be determined below.
Should your called for manage data transfer is actually ? c c , then the proportional gain K p c can be acquired away from Eq. (2.34) and also the integrated get K we c can be obtained off Eq. (2.31) because the
It is vital to remember that the gains of the operator believe this new motor parameters L good and you will R a good . And get philosophy to get the exact same current control results ple, a motor that have a huge value of winding inductance, whose current is tough adjust, requires a bigger proportional gain to track down an equal bandwidth out-of the modern handle than by using a tiny worth of winding inductance, whose latest is simple adjust. For this reason, specific factual statements about the fresh new motor parameters is essential to own requisite current-control abilities.