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 |
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.
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