DEVICE FOR DETECTING RIPPLE IN DC MOTOR

Japanese Patent JP2014007804

A

To provide a device for detecting a ripple in a DC motor which implements higher accuracy of position detection than an existing technique by measuring an overrun after the DC motor is powered down.

A device 2 for detecting a ripple in a DC motor of the present invention includes: a current detection section 43 (shunt resistance) for detecting an armature current flowing through an armature winding via brushes 31, 32 and a commutator; a ripple detection section 44 for detecting a current ripple included in the armature current; and a closed circuit forming section (a selection relay 71, a short circuit line 73) for forming a closed circuit electrically connecting the armature winding and the current detection section 43 in series when a DC power supply 5 (a battery) is shut off. After the DC power supply 5 is shut off, the current detection section 43 detects a closed circuit current Is flowing through the closed circuit, and the ripple detection section 44 detects a current ripple included in the closed circuit current Is.

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ISHIKAWA HITOSHI
TAKAHASHI YAMATO
KANIE HIDEYUKI
SAITO TAKUYA

JP2012140343A

January 16, 2014

June 22, 2012

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AISIN SEIKI

H02P7/06

JP2005323488A	2005-11-17
JPH0998591A	1997-04-08
JP2000250629A	2000-09-14

Kobayashi Osamu

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