Disclosed is a method for controlling an SRM (Switched Reluctance Motor)
switching angle by an analog encoder system that can perform a precise control
of the switching angle of the SRM by comparing an analog sensor signal detected
by the analog encoder system with a switching-on/off command signal. During a rotation
of an encoder rotor having rotary slits formed at the same intervals on the encoder
rotor and continuous contrast patterns formed between the respective rotary slits,
analog sensor signals a to d detected in proportion
to the contrast patterns are compared with a switching-on/off command signal controlled
by a digital-to-analog (D/A) converter. A switching-on angle on is
set to a crossing point of the switching-on command signal Von and a
slope between the sensor signals a and o, and
a switching-off angle off is set to a crossing point of the switching-off
command signal Voff and a slope between the sensor signals o
and d.
