Method for detecting rotor angle of DC brushless motor and...

Details Method for detecting rotor angle of DC brushless motor and... Method for detecting rotor angle of DC brushless motor and...

2008-07-15

2008-07-15

Masih, Karen (Department: 2837)

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

C318S254100, C318S434000, C318S432000, C318S434000, C318S542000

Reexamination Certificate

active

07400101

ABSTRACT:
A method and an apparatus accurately detect a rotor angle of a DC brushless motor by using a first-order difference of a detected value of a phase current. A periodic signal causing the total sum of output voltages in three control cycles to become zero is superposed over a drive voltage under current feedback control. The drive voltage is held at a constant level during the three control cycles. The phase difference between an actual value and an estimated value of a rotor angle is calculated, using the first-order differential current in each control cycle, and the estimated value of the rotor angle is calculated by follow-up computation of an observer, using the phase difference.

REFERENCES:
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patent: 6812659 (2004-11-01), Imai et al.
patent: 6812660 (2004-11-01), Takahashi et al.
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patent: 6909290 (2005-06-01), Imai et al.
patent: 2004-048934 (2004-02-01), None
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patent: 2004-222437 (2004-08-01), None

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