Method for controlling SRM switching angle by analog encoder system
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United States of America Patent
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Mar 7, 2006
Grant Date -
Jun 16, 2005
app pub date -
Dec 9, 2004
filing date -
Dec 10, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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 θa to θd 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 θon is set to a crossing point of the switching-on command signal Von and a slope between the sensor signals θa and θo, and a switching-off angle θoff is set to a crossing point of the switching-off command signal Voff and a slope between the sensor signals θo and θd.
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