105results about How to "Reduce mutual inductance" patented technology

The invention provides a double-stator high-power-density flux switching permanent magnet motor. The double-stator high-power-density flux switching permanent magnet motor comprises an outer stator, an inner stator and a rotor, and air gaps exist between the rotor and the stators. The rotor is composed of magnetic blocks, the magnetic blocks are evenly distributed in space and can be arranged at intervals or connected into a whole through connecting bridges; the outer stator is composed of U-type magnetic blocks, tangential magnetized permanent magnets and concentrated windings; every permanent magnet is clamped between the corresponding two neighboring U-type magnetic blocks, and the concentrated windings are arranged inside the grooves of the U-type magnetic blocks and house the permanent magnets; the neighboring permanent magnets magnetize alternately each other in the tangent direction; the radial axises of U-type magnetic blocks of the inner stator and the outer stator mutually coincide, and the magnetic teeth of the U-type magnetic blocks of the inner stator and the outer stator are opposite to each other; the magnetizing directions of the permanent magnets of the inner stator and the outer stator, which are identical in spatial position, are inverse, and the concentrated windings of the inner stator and the outer stator, which are identical in spatial position, are on the same phase. Compared with the prior art, the double-stator high-power-density flux switching permanent magnet motor omits rotor magnetic yokes, reduces the size of the rotor and the consumption of iron, improves the power density and the efficiency and can be applied to power systems such as wind power generation, electric vehicles and ships and warships.

The invention discloses a double-speed winding switch reluctance motor. Stator teeth in even number are arranged on a stator, and concentrated windings are arranged on the stator teeth. The concentrated windings comprise low-speed concentrated windings and high-speed concentrated windings, and the number of turns of the low-speed concentrated windings is more than that of the high-speed concentrated windings. The wire diameter of each low-speed concentrated winding is smaller than that of one high-speed concentrated winding, and in two adjacent stator teeth, one stator tooth is coiled with a low-speed concentrated winding, and the other stator tooth is coiled with a high-speed concentrated winding. A low-speed concentrated winding is arranged on the opposite side of another low-speed concentrated winding in the radial direction of the stator, and moreover the two low-speed concentrated windings are connected in series or in parallel to form a one-phase low-speed winding. The opposite side of each high-speed concentrated winding is provided with another high-speed concentrated winding in the radial direction of the stator, and the two high-speed concentrated windings are connected in series or in parallel to form a one-phase high-speed winding. The double-speed winding switch reluctance motor can output large torque in low-speed operation, and has a wide speed regulation range in high-speed operation.

A plasma accelerator is provided. The plasma accelerator includes a chamber having a closed top, an opened bottom and a lateral surface, a first coil section comprising a plurality of coils that are connected to one another in series and are wound around the lateral surface of the chamber in opposite directions, and a second coil section comprising a plurality of coils that are wound around the lateral surface of the chamber between coils of the first coil section in opposite directions. Accordingly, it is possible to make the mutual inductance between the coils small, to accurately adjust levels and phase differences of currents to be applied to the coils, and also to simplify the driving circuit.