US 6,983,102 B2
Motor control device for vehicular power mirror
Ayako Yamada, Fujieda (Japan); Akiyoshi Kobayashi, Fujieda (Japan); and Mitsuyoshi Nagao, Fujieda (Japan)
Assigned to Murakami Corporation, Shizuoka (Japan)
Filed on Sep. 16, 2003, as Appl. No. 10/662,519.
Claims priority of application No. 2003-157483 (JP), filed on Jun. 03, 2003.
Prior Publication US 2004/0247299 A1, Dec. 09, 2004
Int. Cl. H02P 5/00 (2006.01)
U.S. Cl. 388—800 2 Claims
OG exemplary drawing
 
1. A motor control device for a vehicular power mirror comprising:
a driving motor that is constructed of a direct current brush motor;
a motor signal detector that utilizes a pickup coil connected in series with the driving motor to detect high-frequency motor brush switching signals generated from the driving motor, and outputs the detected high-frequency motor brush switching signals shaped in a waveform of pulse signals; and
a pulse signal counter that counts the pulse signals, wherein the pulse signal counter makes a correction of the number of counts by adding one pulse thereto every time an interval between a pulse signal to be currently counted and an immediately preceding pulse signal thereof is longer than a predetermined average interval.