Murakami Corporation

Norihiro Suzuki

Ayako Yamada

Noriyuki Takemasa

Hiromi Iwasaki

The present invention provides a DC brush motor rotation amount detection method comprising the steps of: counting pulses generated by switching of brushes when a DC brush motor rotates; removing any noise pulse generated during a pulse rejection period which is shorter than a pulse interval and which is started when each pulse is generated; counting pulses generated during pulse acceptance periods outside the pulse rejection periods; and detecting a rotation amount of the DC brush motor, wherein the pulse rejection period during steady-state operation of the DC brush motor is ended when a predetermined time elapses from a start point of the pulse rejection period, where the predetermined time is calculated by multiplying a pulse interval of a corresponding pulse zone one rotation before a pulse zone to which the pulse rejection period belongs by a coefficient K(&#xbd;&#x3c;K&#x3c;1).

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Fujieda, Japan

Norihiro Suzuki