Method for determining the back electromotive force induced...

Details Method for determining the back electromotive force induced... Method for determining the back electromotive force induced...

2006-12-06

2009-02-03

Benson, Walter (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S459000, C360S075000, C360S078060

Reexamination Certificate

active

07486039

ABSTRACT:
A method to determine a back electromotive force induced in a coil of a voice-coil motor by its motion. The motor is driven in a discontinuous mode by commanding alternating on-phases and off-phases (tristate). A drive current flowing in the coil or a drive voltage on the coil at an end of an on-phase is sensed. An amplitude of a voltage disturbance induced in the coil by mutual induction between a permanent magnet of the voice-coil motor and the moving coil as a function of the sensed drive current or drive voltage is estimated. Voltage on the coil is sensed during a following off-phase with no current flowing in the coil. The back electromotive force induced in the moving coil is determined as a difference between the sensed voltage and the estimated amplitude of the voltage disturbance.

REFERENCES:
patent: 5455723 (1995-10-01), Boutaghou et al.
patent: 6542324 (2003-04-01), Galbiati et al.
patent: 6788490 (2004-09-01), Schillaci et al.
patent: 7327103 (2008-02-01), El-Sadi
patent: 2002/0054451 (2002-05-01), Moon et al.
patent: 2003/0102834 (2003-06-01), Hussein
patent: 2004/0027088 (2004-02-01), Abe et al.

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