By Ramesh M. Gaonkar
Textbook meant for undergraduate coursework in engineering, expertise, and computing device technological know-how, supplying a finished remedy of the microprocessor, overlaying either and software program established within the Z80 microprocessor kinfolk. Illustrative courses were extra within the textual content in addition to different advancements. past version: c1993. DLC: Zilog Z-80 (Microprocessor)
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Extra info for Z-80 Microprocessor: Architecture, Interfacing, Programming and Design
The correspondence between rotor position and the number of excitation changes is now lost and the subsequent rotor movement is erratic. 1)) and therefore in these motors the rotor can be several steps from the demanded position without losing synchronism. This resonant behaviour of the system leads to a loss of motor torque at well deﬁned stepping rates, as illustrated by the dips in the pull-out torque/speed characteristic of Fig. 1. 4) or from direct measurement of the single-step response. Resonance is likely to occur if, at the end of the excitation interval, the rotor is in advance of the equilibrium position and has a positive velocity.
This reduction in efﬁciency, coupled with the extra winding costs, is very signiﬁcant for larger sizes of stepping motor, which are therefore rarely biﬁlar-wound. As the two biﬁlar windings of each phase are situated on the same stator poles within the motor, there is close mutual coupling between the windings, and this must be taken into account when considering circuit conditions at turn-on and turn-off. 6) = Ldi2 /dt − Mdi1 /dt where L and M are the winding self- and mutual inductances, which have equal magnitude kf N 2 .
6) where θ is the instantaneous position of the motor/load/housing and θD is the damper inertia position. Dampers are carefully designed so that this linear relationship is preserved over a wide range of speed difference. 7) the damper torque is zero. 6) if the damper torque is zero, the damper rotor and housing must be operating at equal speeds. A well designed damper can produce a considerable improvement in the singlestep response. 8) where J includes the damper housing inertia, JH . 3) for the system without a damper.
Z-80 Microprocessor: Architecture, Interfacing, Programming and Design by Ramesh M. Gaonkar