Direct-current motor

Electrical generator or motor structure – Dynamoelectric – Rotary

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Details

310216, 310261, H02K 2126

Patent

active

055481710

ABSTRACT:
A direct-current motor is provided with a field pole including a main magnetic pole having an axial length of Lm and an auxiliary magnetic pole; and an armature core which is rotatably supported opposite to the inner peripheral side of the main magnetic pole and rotated by the excitation force of the field pole and has an axial length of Lc. The direct-current motor which satisfies the relation of Lm>Lc is such that the corner portions of the main magnetic pole are formed so that the relation between the axial length Ln of the straight section of the main magnetic pole and Lc satisfies 1.15 Lc>Ln.gtoreq.Lc. Therefore, a direct-current motor can be made more lightweight without changing its output characteristics by cutting down the corner portions of the main magnetic pole.

REFERENCES:
patent: 4823037 (1989-04-01), Abukawa
patent: 4918830 (1990-04-01), Aso
patent: 5083054 (1992-01-01), Tomite

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