초록 ▼

A linear force motor has an elongated body provided with an annular chamber therewithin. An armature is arranged within the chamber for axial movement relative thereto. Two axially-spaced permanent magnets, with their like poles arranged to face one another, are arranged within the body radially inw

A linear force motor has an elongated body provided with an annular chamber therewithin. An armature is arranged within the chamber for axial movement relative thereto. Two axially-spaced permanent magnets, with their like poles arranged to face one another, are arranged within the body radially inwardly of the chamber, and are separated by a common polepiece. The force motor has four axially-spaced active air gaps, arranged in various reciprocal pairs and various parallel pairs. When the armature is shifted one direction relative to the body, the majority of each magnet\s static flux passes through one parallel pair of air gaps. When the armature is shifted in the other direction relative to the body, the majority of each magnet static flux passes through the other parallel pair of air gaps. The motor has one or more coils operatively arranged to generate control flux in a path which passes through at least one reciprocal pair of air gaps. The control flux, when superimposed on the static flux pattern, creates a net flux, which urges the armature to move in a desired direction relative to the body.

대표청구항 ▼

A linear force motor, comprising: a body having an elongated chamber therewithin; an armature arranged within said chamber for axial movement therealong relative to said body, said body and armature having surfaces cooperating to form first, second, third and fourth variable-reluctance axial air gap

A linear force motor, comprising: a body having an elongated chamber therewithin; an armature arranged within said chamber for axial movement therealong relative to said body, said body and armature having surfaces cooperating to form first, second, third and fourth variable-reluctance axial air gaps therebetween, said first and second air gaps being arranged in one reciprocal pair such that the sum of their lengths is constant, said third and fourth air gaps being arranged in another reciprocal pair such that the sum of their lengths is constant, said first and third air gaps forming one parallel pair such that their lengths vary proportionally when said armature moves relative to said body, and said second and fourth air gaps forming another parallel pair such that their lengths vary proportionally when said armature moves relative to said body; magnet means mounted on said body and operatively arranged to provide static flux in said air gaps; and coil means arranged in said chamber and selectively energizable to produce control flux in one path which passes through said first and fourth air gaps but not said second and third air gaps, and in another path which passes through said second and third air gaps but not said first and fourth air gaps.