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 an iron core configuration of a commutator motor (commutator motor) used in electric blowers such as electric vacuum cleaners. Background technique [0002] In the past, commutator motors with two magnetic poles were often used as motors used in electric blowers. This is because the motor can have series excitation characteristics, that is, when the load is light, the speed increases, and when the load is heavy, the speed decreases to generate high torque, so it has characteristics suitable for driving the blower. [0003] In conventional commutator motors, the same material is used for the stator core and the armature core. Electromagnetic steel sheets are punched out with metal dies and stacked to form the stator and armature cores. The field coils are wound on the magnetic poles of the stator cores. The armature coil is wound on the groove of the armature core. Here, electric vacuum cleaners are one of the most wid...

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.

Images