Title:
ELECTRIC MOTOR AND ELECTRICAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/049449
Kind Code:
A1
Abstract:
This electric motor (1) detects the the rotational speed thereof on the basis of the current ripple of a current waveform of the electric motor and is provided with: a rotor (20) having a shaft (21) that is a rotating shaft; a commutator (30) attached to the shaft (21); energizing brushes (40) in contact with the commutator (30); and auxiliary brushes (50) in contact with the commutator (30). The commutator (30) comprises a plurality of commutator segments (31) provided along the circumferential direction of the shaft (21). The maximum value of a current ripple generated as a result of both the energizing brushes (40) and the auxiliary brushes (50) being in sliding contact with the commutator segments (31) is greater than the maximum value of the current ripple generated as a result of only the energizing brushes (40) among the energizing brushes (40) and the auxiliary brushes (50) being in sliding contact with the commutator segments (31).
More Like This:
Inventors:
NAKANO KEISAKU
ASANO TAKAHIRO
YORINO TOMOKO
TOYA KAZUO
ASANO TAKAHIRO
YORINO TOMOKO
TOYA KAZUO
Application Number:
PCT/JP2020/033752
Publication Date:
March 18, 2021
Filing Date:
September 07, 2020
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
H02K13/00; H02K11/21; H02K11/27; H02K23/00; H02K23/66
Foreign References:
| FR2791486A1 | 2000-09-29 | |||
| EP0359855A1 | 1990-03-28 | |||
| US20090304368A1 | 2009-12-10 |
Attorney, Agent or Firm:
NII, Hiromori et al. (JP)
Download PDF: