High efficiency linear motor
First Claim
1. A linear motor having an armature comprising:
- a plurality of coil assemblies;
a base plate;
said coil assemblies being next to each other upon said base plate in a non-overlapping and non-interleaving arrangement;
said coil assemblies including a coil composed of windings of a conductor;
a plurality of center tooth members;
said windings being tightly wound on the center tooth members so as to minimize air spaces between the windings, adjacent windings, and the center tooth members;
at least one outside tooth member on an outer side of each coil assembly and parallel with said center tooth members; and
means for insulating said windings from each other and from said center and outside tooth members.
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Accused Products
Abstract
A linear motor has coil assemblies driven by multiple phases mounted side by side on a base plate such that they do not overlap. The coil assemblies include conductors wound upon teeth such that voids in the coil assemblies are minimized along with path lengths and thermal resistances between windings and the base plate, thus maximizing heat dissipation and the power capacity of the motor. The linear motor may have coil assemblies with teeth composed of a first material having desirable magnetic properties and a base plate composed of an inexpensive second material minimizing costs of materials. The teeth may be of varying lengths in or to further minimize voids. The coil assemblies are compactly mounted with a longitudinal axis normal to an axis of movement. Permanent magnets are mounted upon a back iron plate with axis of symmetry normal to the axis of movement. The magnets have outline shapes such that a generally sinusoidal magnetic flux distribution is produced along said axis of movement so as to prevent cogging.
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Citations
18 Claims
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1. A linear motor having an armature comprising:
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a plurality of coil assemblies; a base plate; said coil assemblies being next to each other upon said base plate in a non-overlapping and non-interleaving arrangement; said coil assemblies including a coil composed of windings of a conductor; a plurality of center tooth members; said windings being tightly wound on the center tooth members so as to minimize air spaces between the windings, adjacent windings, and the center tooth members; at least one outside tooth member on an outer side of each coil assembly and parallel with said center tooth members; and means for insulating said windings from each other and from said center and outside tooth members. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A coil assembly for use in linear motors comprising:
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a coil composed of windings of a conductor; a plurality of center tooth members; said windings being tightly wound on the center tooth members so as to minimize air spaces between the windings, adjacent windings, and the center tooth members; at least one outside tooth member on an outer side of said coil and parallel with said center tooth members; and means for insulating said windings from each other and from said center and outside tooth members. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A coil assembly comprising:
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concentric coils; teeth inside a center of and interposed between the concentric coils; the teeth being spaced apart along a first direction; the concentric coils being substantially in the first direction and in a second direction perpendicular to the first direction; the teeth having lengths increasing in the second direction as distances in the first direction from the teeth to the center of the concentric coils increase such that voids between the teeth and the concentric coils are minimized so as to facilitate heat transfer. - View Dependent Claims (18)
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Specification