35results about How to "Reduced risk of irreversible demagnetization" patented technology

The invention discloses an application method of mixed permanent magnets in a flux-switching permanent magnet motor, and relates to stator-core motors with permanent magnets. Rare-earth permanent magnets with high magnetic energy products are mounted at yoke positions of a stator module of the flux-switching permanent magnet motor. Ferrite permanent magnets with low magnetic energy products are mounted at tooth positions close to the motor stator module. The rare-earth permanent magnets with the high magnetic energy products and the ferrite permanent magnets with the low magnetic energy products are connected to be integrated into the mixed permanent magnets. The mixed permanent magnets with clockwise magnetization directions are mounted on one side of the motor stator module. The mixed permanent magnets with anticlockwise magnetization directions are mounted on the other side of the motor stator module. The mixed permanent magnets with the clockwise magnetization directions and the mixed permanent magnets with the anticlockwise magnetization directions are alternately mounted on two sides of the motor stator module. The defects of ultrahigh cost of existing flux-switching permanent magnet motors, serious magnetic saturation of teeth, reduction of motor torque density and large cogging torque are overcome.

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.