US 5,317,220 A · Linear DC motor

Abstract

An embodiment has an armature member having a linear core with transverse open slots distributed over its length. Two sets of coils are disposed in the slots and distributed over the length of the core preferably in an overlapping interlaced pattern such that when the sets of coils, or corresponding sub-sets of the coils, are simultaneously energized the magnetic forces produced by one augments the forces produced by the other to produce a greater total force. The armature member also has disposed on opposite sides of the core and parallel to the core a pair of linear commutators. A field member has a carriage which travels rectilinearly along the core between the commutators. Dual sets of brushes are linearly mounted on the carriage at opposite sides to communicate with the commutators. The dual sets of coils can be energized in parallel or in series via the brush/commutator contacts or each set of coils can be energized separately by independently powering the set's corresponding set of brushes. An impedance matching device allows armatures to be joined colinearly to increase the effective stroke of the field member without an impedance anomaly at the juncture.

Claims16

Dependent claims

A linear DC motor comprising:

a linear core defining a plurality of slots distributed over its length,
dual sets of coils disposed in said slots and interlaced in the core slots to balance impedances and heat dissipation thereof,
corresponding dual commutation means each for progressively energizing its corresponding set of coils, respective magnetic forces produced by energization of corresponding members of the sets of coils being mutually augmentative, and field means relatively moveable rectilinearly along and parallel to the core proximate thereto for presenting a magnetic field to the sets of coils,
the interaction of the magnetic field from the field means and magnetic forces produced by progressive energization of at least one of the sets of coils causing movement of the field means relative to the core.

1 more element

A linear DC motor comprising:

an armature member comprising:
a linear core defining a plurality of open transverse slots distributed over its length,
dual sets of coils disposed in said slots, respective magnetic forces produced by energization of corresponding members of the sets of coils being mutually augmentative,
corresponding dual linear commutator means each for providing energization access to each coil in its corresponding set of coils,
a field member comprising:
a carriage having a side facing the core slots, the carriage being moveable relative to the armature member rectilinearly along and parallel to the core,
means mounted on the side of the carriage facing the core slots and proximate thereto for presenting a magnetic field to the sets of coils, and
dual linear brush means corresponding to the dual linear commutator means and mounted on the carriage, each linear brush means communicating with its corresponding linear commutator means for progressively energizing a corresponding set of coils,
the interaction of the magnetic field from the field member and magnetic forces produced by progressive energization of at least one of the sets of coils causing movement of the field member relative to the armature member.

6 more elements

Dependencies are inferred from the claim text.

Linear DC motor

Life of this patent

Linear DC motor

Life of this patent

Abstract

Claims16