Page 579 - Mechanical Engineers' Handbook (Volume 2)
P. 579

570   Servoactuators for Closed-Loop Control











































                                     Figure 18 Electrical modulator configurations; (a) type T; (b) type H.



                          and Fig. 20b shows the associated circuit diagram. Figure 21 shows the firing sequence for
                          unipolar and bipolar configurations.

                          Mathematical Model—Bipolar Drive PWM Amplifier
                          The average voltage v ma  applied over one cycle of the PWM signal is given by (see Ref. 9,
                          Section 4.5.3)













                                               Figure 19 PWM amplifier configuration.
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