Control Systems

Download Digital control of electrical drives by Slobodan N. Vukosavic PDF

By Slobodan N. Vukosavic

''Digital keep watch over of electric Drives deals perception into electrical drives keep an eye on and their utilization in movement keep watch over setting. It presents hyperlinks between electric computing device and keep an eye on thought, sensible features, programming matters, and application-specific difficulties. The ebook prepares the reader to appreciate the most important parts of movement regulate structures, to investigate and layout discrete-time pace and position Read more...

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The simulation traces labeled A in Fig. 15 represent the trapezoidal reference profile and the output speed, in the case when the feedforward controller is disconnected and the driving torque is obtained from the feedback controller only (Tem = TSC). As anticipated in Eq. 46, the ramp shaped reference is tracked with an error. When an accurate feedforward compensation TFF is added to the driving torque (Eq. 61), with the TFF signal obtained from Eq. 59, the reference profile is tracked with no error.

C (n − p )! t k= p k k− p . 53) From this expression, it is found that the nth-order time derivative of the same function is a constant (Eq. , dtn d n +1 ω * = 0. 54) Given Eq. 54, the speed reference profile ω*(t) with dkω∗/dt k ≡ 0 for each k > n can be successfully tracked with a speed controller comprising a weighted sum of control actions 1/s p, with p ranging from 0 to n + 1 (Eq. 55). Hence, the speed reference profiles with an abundance of nonzero higher-order time derivatives are more difficult to track, as they call for a more complex WSC (s): n +1 Kk K K K = K 0 + 1 + 22 + ...

Under the assumption that the load torque changes as TL(t) = TRAMP t h(t), and with ω* = 0, determine the complex image TL(s) and the steady-state value of the speed error ∆ω (∞). 3 The speed controller in Fig. 2 has the proportional and integral actions in the direct path. 001 Nm/(rad/s). Assuming that the load torque changes as TL(t) = TRAMP t h(t), and with ω* = 0, determine the complex image TL(s) and the steady-state value of the speed error ∆ω(∞). 3, determine the closed-loop transfer function, the closed-loop zeros and poles, their undamped natural frequency ωn, and the damping factor ξ.

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