The invention provides a monotonic magnetic ring double-modulation type
magnetic gear and a hub motor used for a
new energy automobile. The
magnetic gear comprises an inner rotor, a Z-shaped magnetic ring adjusting
stator, a middle rotor and an outer rotor. The inner rotor, the middle rotor and the Z-shaped
magnetism adjusting ring
stator are coaxially and sequentially nested from inside to outside to form a radial modulation coaxial
magnetic gear structure, and the modulation mode is difference modulation; the middle rotor, the Z-shaped
magnetic field adjusting ring
stator and the outer rotor are coaxially and sequentially nested from bottom to top to form an axially-modulated coaxial magnetic gear structure, and the modulation mode is sum modulation; a radial air gap is formed between the inner rotor and the middle rotor, and an axial air gap is formed between the middle rotor and the outer rotor; the Z-shaped adjustable magnetic ring stator comprises a plurality of Z-shaped adjustable magnetic iron cores, the middle rotor serves as an input rotor, and the inner rotor and the outer rotor are driven to rotate through the
modulation effect of the Z-shaped adjustable magnetic ring stator. The problems that in the prior art, the
magnetic field modulation effect is poor, the device size is large, and the
torque density of a magnetic gear is low can be solved.