Cylindrical member, cylindrical member with tapered part, surface magnet-type motor, and method for manufacturing surface magnet-type motor

Abstract

This cylindrical member (1) is formed of fiber-reinforced plastic satisfying the relationship shown in Expression 2 when a stress vector is defined as σ, a strain vector is defined as ε, a shear stress is defined as τ, a shear strain is defined as γ, and an i-row j-column component of an in-plane stiffness matrix Q is defined as component Q ij , and a stress-strain relational expression in an XY plane is represented as shown in Expression 1 in a Cartesian coordinate system O-XYZ in which an intermediate position in the thickness direction of a microelement (10) of the cylindrical member (1) is defined as an origin O, a tangential direction of the cylinder is defined as an X-axis, a direction parallel to the axial direction of the cylinder is defined as a Y-axis, and a radial direction of the cylinder is defined as a Z-axis.