0195136047.pdf

774 BASIC CONTROL SYSTEMS L C M L C M PWM inverter Vd PWM inverter Filter + − Filter Dc link (b) (a) Ac supply Diode bridge Figu ...

16.1 POWER SEMICONDUCTOR-CONTROLLED DRIVES 775 (^0) π/2 πω 2 π t 2 π/3 3 π/2 Phase voltage Phase current −Id Id Figure 16.1.22Ro ...

776 BASIC CONTROL SYSTEMS 0 T ωs ωm Trated δ = 0 δ = 1 1 > δ 1 > δ 2 > 0 δ 2 δ 1 Natural Figure 16.1.24Effect of static ...

16.1 POWER SEMICONDUCTOR-CONTROLLED DRIVES 777 With rotor resistance control, T= 3 ωS [ V 12 (R′a/S) ( R 1 +R′b+Ra′/S ) 2 +(Xl 1 ...

778 BASIC CONTROL SYSTEMS results. Waveforms caused by the sensors are also shown in Figure 16.1.25. A detailed discussion of th ...

16.2 FEEDBACK CONTROL SYSTEMS 779 and sinδ= 1500 × 746 3 ×( 6600 / √ 3 )× 144. 2 = 0. 6788 or the torque angleδ= 42 .75° electri ...

780 BASIC CONTROL SYSTEMS TABLE 16.1.4 Applications for the Electronic Control of Motors PracticalSpeed Typical Range for a Outp ...

16.2 FEEDBACK CONTROL SYSTEMS 781 Ac Drives AC power controller Class D squirrel-cageinduction motor 0–25 1:2 Quad 1 drivingQuad ...

782 BASIC CONTROL SYSTEMS Activating signal u Controlled variable c Reference input r Controller Controlledprocess Figure 16.2.1 ...

16.2 FEEDBACK CONTROL SYSTEMS 783 According to the type of system components. Electromechanical control systems. Hydraulic cont ...

784 BASIC CONTROL SYSTEMS as the Laplace transform of the impulse response. The impulse response of a linear system is defined a ...

16.2 FEEDBACK CONTROL SYSTEMS 785 The transfer functionMof the closed-loop system is then given by M= C R = G 1 +HG = direct tra ...

786 BASIC CONTROL SYSTEMS EFFECT OFFEEDBACK ONSENSITIVITY TOPARAMETERCHANGES A good control system, in general, should be rather ...

16.2 FEEDBACK CONTROL SYSTEMS 787 for which the corresponding time solution is given by c(t)=K( 1 −et/τ) (16.2.10) which is clea ...

788 BASIC CONTROL SYSTEMS M= C R = K/τ p+ 1 /τ 1 + HK/τ p+ 1 /τ = K/τ p+ 1 +HK τ (16.2.16) and the corresponding transient solut ...

16.2 FEEDBACK CONTROL SYSTEMS 789 With the development and widespread use of digital (discrete) control systems and the advent o ...

790 BASIC CONTROL SYSTEMS Settling time tsis the time required for the step response to decrease and stay within a specified pe ...

16.2 FEEDBACK CONTROL SYSTEMS 791 TABLE 16.2.2Steady-State Error Response for Unit Inputs System Type Unit Step ( 1 s ) Unit Ram ...

792 BASIC CONTROL SYSTEMS E Feedback potentiometer Input potentiometer Servo amplifier Gain factor Ka Load J, F, TL c Output Mot ...

16.2 FEEDBACK CONTROL SYSTEMS 793 function, whereas the natural frequencyωnof a system provides a measure of the settling time ( ...