EP0134475A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Direct current motor
Assignee: Mitsubishi Electric Corp
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Filing: 1984-07-05
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Granted: —
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Expires: 2004-07-05
Abstract
Abstract A.d.c. motor comprises a cylindrical yoke, at least one set of field magnets consisting of permanent magnets fixed to the inner peripheral surface of the yoke, an armature wound with armature windings so as to be surrounded by the field magnets, a commutator (4) firmly mounted on a rotary shaft of the armature, a set of brushes (14, 141) being in slide-contact with the commutator, and a displacing means (15) for shifting the position at which the brushes are made in slide-contact with the commutator in the counter direction of the rotation of the armature depending on temperature rise of the d.c. motor.
Inventors
- 👤 Akira Morishita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 20:21
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/44; H02; H02K; H02K23/00; H02K23/02; H02K23/04; H02K23/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
A d.c. motor characterized by: a cylindrical yoke (13), at least one set of field magnets consisting of permanent magnets fixed to the inner peripheral surface of said yoke, an armature wound with armature windings so as to be surrounded by said field magnets, a commutator (4) firmly mounted on a rotary shaft of said armature, a set of brushes (14,141) being in slide-contact with said commutator (4), and a displacing means (15) for shifting the position at which said brushes are made in slide-contact with said commutator in the counter direction of the rotation of said armature depending on rise in temperature of said d.c. motor.
Claim 2
Dependent Claim
107 words
A d.c. motor characterized by: a cylindrical yoke (13), at least one set of field magnets consisting of permanent magnets fixed to the inner peripheral surface of said yoke, an armature wound with armature windings so as to be surrounded by said field magnets, a commutator (4) firmly mounted on a rotary shaft of said armature, a set of brushes (14,141) being in slide-contact with said commutator (4), and a displacing means (15) for shifting the position at which said brushes are made in slide-contact with said commutator in the counter direction of the rotation of said armature depending on rise in temperature of said d.c. motor.
Claim 3
Dependent Claim
24 words
The d.c. motor according to Claim 1, characterized in that said displacing means is a spring means (15) consisting of a shape memorizing alloy.
Claim 4
Dependent Claim
18 words
The d.c. motor according to Claim 2, characterized in that said spring means (15) is a coil spring.
References Cited (Backward Citations)
GB1237988A
Cited
GB1491700A
Cited
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