ANCHOR WINDINGS OF DC LINEAR MOTORS

Abstract

A linear DC electric motor in the simplest case represents a sweep on the plane of a rotating DC machine. In the first variant, this is an armature as a moving part and an inductor with poles as a fixed part, the length of which exceeds the length of the armature by the amount of displacement. In the second variant, the armature as a fixed part has a length greater than the length of the inductor by the amount of displacement. This variant was first manufactured in a cylindrical design. The armature winding can be switched by both an electromechanical and an electronic switch. For example, in a cylindrical design with a long armature, the brushes simply slid along the stripped armature winding. The disadvantage of both variants is the increased copper consumption for the windings of the fixed element, which depend on the amount of displacement.

To eliminate this drawback, linear DC motors were developed with a combination of the armature winding and the excitation winding on the moving element, and the fixed part represents a ferromagnetic pole-forming system located along the entire length of the displacement. At the same time, both a single-name pole excitation system and a different-name pole excitation system can be formed with respect to the armature. In a single-name pole excitation system, only half of the active sides of the armature winding sections are active. In the case of a different-pole system, it is possible to ensure full use of the armature winding, but the design of the magnetic system will be more complex.

The open magnetic core configuration leads to edge effects and specific features in the design of the armature winding. From the point of view of the armature winding, we are interested in the first variant of the sweep of a rotating-type DC machine and the variant with the combination of the armature winding and the excitation winding on the moving element. That is, we are considering a variant of a linear motor in which the armature is a moving element, and its length is less than the fixed part by the amount of displacement. Therefore, it is necessary to consider the possibility of using classical drum armature windings and ring windings for the armatures of linear DC motors and to analyze new approaches to the formation of windings.