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Title:
STOP DETECTOR, STOP DETECTION METHOD, AND SECURITY SYSTEM
Document Type and Number:
Japanese Patent JP2009106092
Kind Code:
A
Abstract:

To increase the accuracy of stop detection of a motor by reducing the variations and errors in threshold setting to be used for determination of the stop of the motor.

Back electromotive force (BEMF) of the motor is detected. It is determined that the motor has stopped at the time t2 when a set time T has passed since the time t1 when the detected value of the BEMF became a first fixed threshold L1 or below. The set time T is set as a digital value by means of a digital setting switch. Unlike the conventional method, setting the threshold in analog volume is not necessary.


Inventors:
NAKAYAMA AKIYUKI
AKAGI TETSUYA
HIGUCHI TOSHIYUKI
HASHIMOTO MINORU
KAMIZONO DAICHI
Application Number:
JP2007276003A
Publication Date:
May 14, 2009
Filing Date:
October 24, 2007
Export Citation:
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Assignee:
OMRON TATEISI ELECTRONICS CO
International Classes:
H02P3/18; G01P13/00
Domestic Patent References:
JP2002034284A2002-01-31
JP2005186187A2005-07-14
JPH03190677A1991-08-20
JPS61218396A1986-09-27
Attorney, Agent or Firm:
Kazuhide Okada