Abstract: A method, and a system for reducing the internal temperature of an electrical solenoid or motor device involves placing a heat absorbing phase change material (PCM) in intimate contact with the device to reduce the internal temperature of the device. The PCM material reduces the internal operational temperature of the device by undergoing an endothermic phase transition in an operating temperature range of the device. The PCM material transitions between a solid phase and a liquid phase in the internal operational temperature range of the device, or between a liquid phase and a gaseous phase in the internal operational temperature range of the device. The PCM material can be affixed externally to the device. For example, the PCM material is affixed in the form of externally placed pads to the device. The PCM material can also be affixed inside of the device.

Abstract: An electromagnetic, liquid or gas cooled solenoid coil is constructed of an inner core formed by a simulated pole piece. The inner core has coolant feed ports that communicate with a surrounding perforated bobbin. A pair of ordinary electromagnetic wires is twisted around each other to form a helix, and the helix is wrapped around the perforated bobbin. Liquid or gas coolant is introduced into an opening in the core, flows through the ports into the bobbin, and then flows radially through the coil from the inside diameter of the coil to the outside diameter of the coil, thereby removing heat from the self-heating coil wire. In alternative embodiments, a supply manifold and receiver manifold are integrated into the solenoid coil.

Abstract: An electromagnetic, liquid or gas cooled solenoid coil is constructed of an inner core formed by a simulated pole piece. The inner core has coolant feed ports that communicate with a surrounding perforated bobbin. A pair of ordinary electromagnetic wires is twisted around each other to form a helix, and the helix is wrapped around the perforated bobbin. Liquid or gas coolant is introduced into an opening in the core, flows through the ports into the bobbin, and then flows radially through the coil from the inside diameter of the coil to the outside diameter of the coil, thereby removing heat from the self-heating coil wire. In alternative embodiments, a supply manifold and receiver manifold are integrated into the solenoid coil.

Abstract: A method, and a system for reducing the internal temperature of an electrical solenoid or motor device involves placing a heat absorbing phase change material (PCM) in intimate contact with the device to reduce the internal temperature of the device. The PCM material reduces the internal operational temperature of the device by undergoing an endothermic phase transition in an operating temperature range of the device. The PCM material transitions between a solid phase and a liquid phase in the internal operational temperature range of the device, or between a liquid phase and a gaseous phase in the internal operational temperature range of the device. The PCM material can be affixed externally to the device. For example, the PCM material is affixed in the form of externally placed pads to the device. The PCM material can also be affixed inside of the device.

Abstract: A system (and accompanying method) for reducing thermal shock in a physical device includes: a gas inlet portion; and an ablator material positioned in the gas inlet portion to reduce a temperature differential at a surface between the gas inlet portion and a gaseous material propelled through the gas inlet portion. The gas inlet portion can include: a first material; and a second material having a boundary with the first material, where the ablator material is positioned at the boundary. The first material is not sensitive to thermal shock, and the second material is sensitive to thermal shock. The ablator material can be housed in a recess at the boundary. The first material can be a manifold. The second material can be a portion of a control valve for controlling the direction and amount of a hot gas emitted therefrom. The manifold can include a bypass slot connecting a main inlet gas chamber of the manifold with a surface of the ablator material.

Abstract: A telescoped ammunition round has a propellant charge with an axial cavity. A projectile is housed within the cavity for being fired from the ammunition round. A wear additive is coupled to the forward portion of the propellant charge adjacent the axial cavity.