Title:
DC MOTOR
Document Type and Number:
Japanese Patent JPH01190243
Kind Code:
A
Abstract:
PURPOSE:To reduce electric noises and damage to commutators and brushes according to rotation by constitution of a plurality of armature coils of superconductive material, to which low resistances are connected in parallel. CONSTITUTION:For example, in the case of resistance values of low resistance 7, 8 and 9 are set on 1 ohm, only the maximum 1 volt of voltage could generate immediately after power supply to each armature coil from brushes 10, 11 is disconnected even if the maximum 1 ampere of current is supplied to armature coils 1, 2 and 3. Electric noises caused by spark-noises don't generate with such a degree of voltage, and damage to commutator segments 4, 5, 6 and brushes 10 and 11 is reduced to almost zero. Inn comparison with an addition of such a high voltage absorption element as a bulk capacitor or a carbide varistor, etc., it is very easy to form the low resistance 7, 8 and 9 having such a degree as 1 ohm in parallel with the armature coils 1, 2 and 3.
Inventors:
MIZUGUCHI HIROSHI
Application Number:
JP1384788A
Publication Date:
July 31, 1989
Filing Date:
January 25, 1988
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H02K23/66; (IPC1-7): H02K23/66
Attorney, Agent or Firm:
Toshio Nakao (1 outside)
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