Title:
回転検出装置
Document Type and Number:
Japanese Patent JP5543190
Kind Code:
B2
Abstract:
A direct current motor includes an armature coil having at least three phase coils, a commutator having multiple commutator segments connected to the armature coil, a pair of brushes in slidable contact with the commutator to supply power to the phase coils through the commutator, a rotation shaft, and a ring varistor coaxially fixed to the rotation shaft and having a ring-shaped varistor body and multiple electrodes that are circumferentially arranged on a surface of the varistor body. Each commutator segment is connected to a corresponding electrode of the ring varistor. The electrodes of the ring varistor are paired to form electrode pairs. Each electrode pair includes any two of the electrodes. A capacitance of one electrode pair is different from a capacitance of another electrode pair.
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Inventors:
Ken Tanaka
Yasuhiro Fukagawa
Peak 勝
Yasuhiro Fukagawa
Peak 勝
Application Number:
JP2009286483A
Publication Date:
July 09, 2014
Filing Date:
December 17, 2009
Export Citation:
Assignee:
Japan, Inc. autoparts research institute
Denso, Inc.
Denso, Inc.
International Classes:
H02P7/06; G01D5/245; G01P3/481
Attorney, Agent or Firm:
Nagoya international patent business corporation