Commutator motor

Abstract

The commutator motor includes a stator core made of a material reduced in the deterioration of magnetic characteristics even in a high flux density region (about 1.6-1.8T), and the armature core made of a material reduced in deterioration to an at least inside flux density region (about 1.2-1.4T) and good in iron loss characteristics, and is constituted by combining both. To obtain a high efficiency commutator motor suppressing an exciting current increase while performing the iron loss reduction of an armature core of the commutator motor carried in a vacuum cleaner.

Description

Technical field [0001] The present invention relates to a core structure of a commutator motor (commutator motor) used in an electric blower such as an electric vacuum cleaner. Background technique [0002] In the past, in motors used for electric blowers, commutator motors with two poles were often used. This is because the motor can have series excitation characteristics, that is, the rotation speed increases when the load is light, and the rotation speed decreases when the load is heavy, and high torque is generated, so it has characteristics suitable for driving a blower. [0003] In the conventional commutator motor, the stator core and the armature core are made of the same material. Electromagnetic steel sheets are punched out of a metal die and laminated to form the stator and armature cores. The excitation coil is wound on the magnetic poles of the stator core. The armature coil is wound in the groove of the armature core. Here, the electric vacuum cleaner is one of the ...

AI Technical Summary

Problems solved by technology

[0008] However, in a motor whose volume has been reduced to the limit and weight has been reduced, the cross-sectional area of ​​the magnetic flux flow path is generally reduced. Therefore, it is difficult to reduce the copper loss by making up for the increase in the current with the magnetic flux required to obtain the necessary output.

For this reason, it is impossible to greatly improve efficiency without waiting for the development of materials such as bearings and brushes with low friction coefficients, and low-loss core materials with small loss coefficients per unit magnetic flux.

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