Electromagnetic launcher with spiral guideway

Patent metadata

Field	Value
Publication number	US-10527384-B2
Application number	US-201816106662-A
Country	US
Kind code	B2
Filing date	Aug 21, 2018
Priority date	May 25, 2016
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

An electromagnetic launcher with a curved or spiral-shaped, open-ended guideway and conductors for launching a projectile. The projectile, movably retained on or within the guideway, is accelerated along the guideway using electromagnetic forces until it reaches an end of the guideway, then the projectile is launched in a desired direction. The direction of the launch of the projectile is determined by orienting the guideway in the desired direction using an actuator.

First claim

Having thus described one or more embodiments of the invention, what is claimed as new and desired to be protected by Letters Patent includes the following:

1. An electromagnetic launcher for accelerating a projectile comprising:
conductive material configured to receive electric current such that the electric current induces a magnetic field along the electromagnetic launcher for accelerating the projectile;
a guideway supporting the conductive material and forming a circular path for accelerating the projectile, the guideway having a portion along the circular path that is jointed and disconnectable from a remainder of the circular path at an end of the portion so that the portion is operable to be straightened thereby forming a straight path through which the projectile may exit the electromagnetic launcher, wherein—
the conductive material comprises a plurality of stator coils positioned along the circular path, and
the projectile is positioned inside the guideway and comprises rotor coils made of conductive material configured to receive electric current that induces a magnetic field about the projectile which interacts with the magnetic field induced by the current traveling through the stator coils;

a pair of rails positioned along the guideway and including a positive rail and a negative rail; and
conductive contacts attached to the projectile and configured to movably support the projectile on the pair of rails, wherein the conductive contacts include—
a first set of connectors configured to connect a first end of the rotor coils to the positive rail and a second end of the rotor coils to the negative rail so that an electric current travels through the rotor coils thereby inducing an electromagnetic field about the rotor, and
a second set of connectors connecting a first end of the stator coils to the positive rail and a second end of the stator coils to the negative rail so that a current travels through the stator coils thereby inducing an electromagnetic field between the first end of the stator coils and the second end of the stator coils.

2. The electromagnetic launcher of claim 1 , wherein the two sets of connectors are configured to independently switch polarities of the electromagnetic fields induced on the rotor coils or the stator coils.

3. The electromagnetic launcher of claim 1 , wherein the conductive contacts comprise ball or cylindrical bearings to reduce friction and springs to absorb shock.

4. A method of launching a projectile, the method comprising the steps of:
accelerating the projectile along a circular path in a guideway of an electromagnetic launcher using an electromagnetic force induced by current traveling through conductive material supported by the guideway, wherein the accelerating includes—
energizing a plurality of stator coils positioned along the circular path,
energizing rotor coils embedded in the projectile,
energizing a pair of rails positioned in the guideway, the pair of rails including a positive rail and a negative rail, and
movably supporting the rotor on the pair of rails with conductive contacts attached to the projectile, the conductive contacts including—
a first set of connectors configured to connect a first end of the rotor coils to the positive rail and a second end of the rotor coils to the negative rail so that an electric current travels through the rotor coils thereby inducing an electromagnetic field about the rotor, and
a second set of connectors connecting a first end of the stator coils to the positive rail and a second end of the stator coils to the negative rail so that a current travels through the stator coils thereby inducing an electromagnetic field between the first end of the stator coils and the second end of the stator coils;

determining whether the projectile has reached a desired speed;
disconnecting a portion of the guideway from a remainder of the guideway;
pivoting the portion so that the projectile may exit the guideway along a straight path.

Assignees

• Honeywell Federal Mfg & Tech Llc

Inventors

• Hartman Seth
• Timpson Erik

Classifications

• F41B6/003 Primary

  using at least one driving coil for accelerating the projectile, e.g. an annular coil · CPC title

• F41B3/04

  Centrifugal sling apparatus · CPC title

• F41B6/006

  Rail launchers · CPC title