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Since dc motors of various types are used extensively in control systems, it is essential for analytical purposes that we establish a mathematical model for the dc motor. Let us consider the case of a separately excited dc motor with constant field excitation. The schematic representation of the model of a dc motor is shown in Figure. We will investigate how the speed of the motor responds to changes in the voltage applied to the armature terminals. The linear analysis involves electrical transients in the armature circuit and the dynamics of the mechanical load driven by the motor. At a constant motor field current If, the electromagnetic torque and the generated emf are given by
Te = Kmia
ea = Kmωm
where Km = kIf is a constant, which is also the ratio ea/ωm. In terms of the magnetization curve, ea is the generated emf corresponding to the field current If at the speed ωm. Let us now try to find the transfer function that relates m(s) to Vt(s).
Q. For the 4-bit D/A converter of Figure with V ref =-5 V, determine the range of analog output voltage and the smallest increment. Ans. The binary input range is from 0
Compare with memory The contents of the memory of the memory location pointed by HL register pair are compared with the contents of the accumulator. The instruction f
Addition of binary numbers Example: Add 110010102 ( -510). and 00000101 2 (+5 10 ) Solution : Binary signed
Define a voltmeter A voltmeter is an instrument used to measure p.d. and must be linked in parallel with the part of the circuit whose p.d. is required.
Q. Explain working of Common drain amplifie? When an ac signal drives the gate of JFET, it produces an ac drain current. It flows through Rs and produces an ac output voltage t
subranging ADC is a modification
Explain the ASSUME assembler directive with example ASSUME: It will be used to map the segment register names along with memory addresses. The Syntax is as g
A balanced star-connected load is connected across a three phase 450V 50 Hz AC supply. Each load element has an impedance of 5+j12 Ω. Calculate: (i) The power factor of the
An electric heater element is made of Nichrome wire having resistivity equal to 100 ×10 -8 ohm-metre. The diameter of the wire is 0.3 mm. Calculate the length of the w
What is assembler? Assembler: An assembler or macro-assembler usually forms a part of the operating system. This translates an assembly language program into machine language
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