By C. J. Chesmond (Auth.)

ISBN-10: 0713135085

ISBN-13: 9780713135084

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The output polarity reverses when the rotation is reversed. 2) but this cannot be completely satisfactory, because the noise frequency varies in proportion to shaft speed and excessive filter time constant could harm the dynamic behaviour of the system for which the tachogenerator is providing the feedback signal; relatively high breakaway torque; relatively high polar moment of inertia. AC Drag-Cup Tachogenerator The principle of operation of this machine is indicated in Figure 22. 2A VELOCITY TRANSDUCERS 45 REFERENCE WINDING v ref applied THIN WALLED CYLINDRICAL COPPER ROTOR I o— X STATOR WINDINGS Ô V 0 OUTPUT WINDING — Ô FIG.

2, the control of DC motors for use in servosystem applications is discussed. In those configurations in which the motor is operated with constant field excitation and the armature is controlled by means of a suitable servoamplifier, an approximate measure of the shaft speed may be obtained by incorporating the armature circuit into a type of Wheatstone bridge arrangement, as shown in Figure 23. 3) FIG. 23 If the differential amplifier has a gain of K, then its output voltage V 0 is given by V 0 =JS [ E B + I A ( R A + R A ) I - K Ά RA, with K « 1 normally.

5. When excited with DC, this machine will generate a DC output voltage having a value proportional to the shaft angular acceleration. 3 AC Signal Alternator This machine is a miniature single phase alternator with a rotating permanent magnet field system. The generator produces a sinusoidal AC output voltage 46 TRANSDUCERS - DISPLACEMENT, REFERENCE AND VELOCITY having both amplitude and frequency proportional to the shaft speed. Because of the absence of a reference phase, this machine is unable to indicate the direction of rotation.

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Control System Technology by C. J. Chesmond (Auth.)

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