DC motor with improved brushes and liquid pump using the same

Details DC motor with improved brushes and liquid pump using the same DC motor with improved brushes and liquid pump using the same

1996-06-17

1998-03-03

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310251, 310239, 310247, 310245, 4174237, H02K 2300

Patent

active

057239320

ABSTRACT:
A liquid pump has a DC motor and a pump in a cylindrical casing. A pair of brushes are slidably contacted with a commutator of an armature while being biased by springs. The specific resistance of the positive brush is lower than the specific resistance of the negative brush to enable the voltage drop at the brushes to be decreased and motor efficiency to be increased without increasing commutator wearing speed. The biasing force provided by the spring biasing the positive brush is lower than the biasing force provided by the spring biasing the negative brush.

REFERENCES:
patent: 4344008 (1982-08-01), Major et al.
patent: 4567414 (1986-01-01), Berings
patent: 4835432 (1989-05-01), De Pasquale
patent: 5081386 (1992-01-01), Iwai
patent: 5088900 (1992-02-01), Yoshioka et al.
patent: 5131822 (1992-07-01), Yamamoto et al.

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