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Additional resources for Precision Frequency Control, Two-Volume Set: Precision Frequency Control, Volume 1: Acoustic Resonators and Filters
Example text
C. link filter capacitance is directly related to the value of R, which is a large fraction of the energy conversion W: in fact R- Inductanc Current 1-0 W x ~ . 12) i i K J A I K Rotor position . Flux-linkage . . . _ Infinite de-fluxing voltage I i tr Fig. 8. I i _ Electronic control of switched reluctance machines 43 i R L v O Fig. 10 Equivalent circuit. 14W. c. link, the filter capacitance must be large enough to absorb R joules with negligible change of voltage. This requirement may be reduced by overlapping charge/discharge requirements of adjacent phases, but still it is a serious consideration.
Machines with m - 1 or 2 are usually irregular. The absolute torque zone T,a is defined as the angle through which one phase can produce nonzero torque in one direction. In a regular motor with Nr rotor poles, the maximum torque zone is Y,a(max)- J'f/N r. The effective torque zone re is the angle through which one phase can produce useful torque comparable to the rated torque. The effective torque zone is comparable to the lesser pole-arc of two overlapping poles. 17 the effective torque zone is equal to the stator pole-arc: Te - - ~ s - - 30 °.
Each phase has four coils, and the magnetic flux-pattern is 4-pole. Electronic control of switched reluctance machines magnetic field in this machine has short flux-paths because of its four-pole magnetic field configuration, unlike the two-pole configuration in the 6/4 (or the 8/6; see below), and the four-pole magnetic circuit helps to minimize acoustic noise (see Chapter 4). Although the MMF per pole is reduced along with the slot area, the effects of long flux-paths through the stator yoke are alleviated.