Motor spindle control system and method

Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems

Reexamination Certificate

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Details

C318S560000, C318S566000, C318S567000, C318S132000, C318S254100, C318S434000

Reexamination Certificate

active

07098621

ABSTRACT:
In a method for measuring motor speed and position by detecting the back EMF generated during pole-pair interactions, a separate respective duration of a power phase suppression signal, that is set during back EMF detection, is stored in memory for each respective pole. The separate respective duration values are determined during a calibration phase by iteratively lengthening each respective duration one unit at a time (up to a maximum value) until no part of the respective back EMF signal occurs outside the suppression signal duration, and those values are stored. During operation, the approach of a pole-pair interaction may be determined from the electrical cycle of the power supply, and then the stored duration value is used to control the state of the suppression signal.

REFERENCES:
patent: 5990643 (1999-11-01), Holling et al.
patent: 6462491 (2002-10-01), Iijima et al.
patent: 2003/0234623 (2003-12-01), Douglas

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