摘要:
A rotor for an electric machine is provided that includes a magnet and a non-magnetic region located adjacent the magnet. The non-magnetic region has an intrusion extending into the non-magnetic region.
摘要:
Aviation fuel, such as jet fuel, blends and methods for improving cold flow properties of such fuels at extremely low temperatures are disclosed. Cold flow properties of, for example, JP-8+100 jet fuel, are improved by addition to the fuel of a polymer formed from polymerization of an α-olefin monomer or monomers. Demonstratable cold flow improvement of such fuels at temperatures of about −53° C. and lower is shown.
摘要:
Aviation fuel, such as jet fuel, blends and methods for improving cold flow properties of such fuels at extremely low temperatures are disclosed. Cold flow properties of, for example, JP-8 jet fuel are improved by addition to the fuel of an oil-soluble, polar nitrogen-containing compound. Demonstratable cold flow improvement of such fuels at temperatures of about −53° C. and lower is shown.
摘要:
A three region control strategy for a permanent magnet motor is presented. In a first control region, the permanent magnet motor is operated at, a 120° conduction square wave mode at reduced phase current, and below a no-load speed. The motor phase current commutation causes eddy current losses in the rotor magnets and core which are insignificant due to the low phase currents and relatively low rotor speed. Meanwhile, the inverter switching losses are kept low as two switches are in use (on/off) for each current commutation during the 120° conduction mode. In a second control region, the permanent magnet motor is operated at a 180° conduction sinusoidal wave mode with high phase currents. The 180° conduction sinusoidal wave mode minimizes the commutation loss. In a third control region, the permanent magnet motor is operated above its no-load speed or in a field weakening mode. At these higher speeds the slot ripple and commutation losses on the rotor increase, and the demagnetizing component of the armature reaction increases due to field weakening. Commutation losses are minimized through sinusoidal current operation. In the field weakening mode, the phase current conduction angle is set to 180° and the phase currents become sinusoidal.
摘要:
An electric machine includes a plurality of teeth separated by a plurality of slots positioned on an armature of the electric machine. Each of the teeth may include at least one bifurcation. A plurality of magnets may be arranged on a main field of the electric machine to form an axial array group. The magnets in the axial array group may be arranged in the main field with respect to each other to create a multi-stepped arrangement having a predetermined step angle. The step angle is determined based on the positioning of the bifurcations and the slots.
摘要:
The present invention is directed to an improved denture adhesive composition. In particular, this invention is directed to a denture adhesive composition free of a hydrocarbon vehicle, such as petrolatum or mineral oil.
摘要:
A high-performance piston core including a first piston cylinder and a second piston cylinder, with a piston center longitudinally disposed between and magnetically coupling the first piston cylinder and the second piston cylinder. The piston center is made of high-performance magnetic material, such as Cobalt steel (CoFe), Silicon steel (SiFe), Vanadium/Cobalt steel (Permendur), alloys thereof, or the like. The high-performance magnetic materials exhibit high magnetic permeability and reduce the magnetic reluctance of flux bottlenecks. In addition, high-performance magnetic materials typically saturate at a higher flux density than the conventional magnetic materials. The first piston cylinder and the second piston cylinder can be made of conventional magnetic material, such as low-carbon steel. The first piston cylinder can include a ring disposed about an end, where the end is longitudinally attached and magnetically coupled to the piston center.
摘要:
A piston damper assembly includes a piston damper and a relative velocity sensor. The piston damper includes a damper body, a piston rod, and a dust tube which is attached to the piston rod. The relative velocity sensor includes an axially extending first magnet supported by the dust tube, a flux collector, and a first sensor coil. The flux collector is supported by the dust tube, includes an axially-extending first prong in axially-extending contact with the first magnet, includes an axially-extending second prong, and includes a joining member connecting the first and second prongs. The first sensor coil surrounds the joining member and/or one of the first and second prongs. A piston-damper dust tube subassembly includes the dust tube and the relative velocity sensor.
摘要:
A magnetorheological (MR) fluid-based device including an MR piston assembly. The MR piston assembly includes a ferromagnetic MR piston core and an electric coil. The MR piston core has a central longitudinal axis and has an outer circumferential surface substantially coaxially aligned with the central longitudinal axis. The electric coil is positioned in the MR piston core and is substantially coaxially aligned with the central longitudinal axis. A portion, or at least a portion, of the electric coil is buried in the MR piston core under the outer circumferential surface.