Electric machine with multi-part trapezoidal teeth

A radial flux electric machine, comprising:

• a rotor configured to rotate about an axis of rotation;
• a plurality of electromagnetic coils;
• a stator including an annular stator ring extending about the axis of rotation, wherein the annular stator ring is a ring-shaped structure that extends about the axis of rotation as a singular structure;
• and
• a plurality of multi-part teeth circumferentially arranged on the annular stator ring, each multi-part tooth of the plurality of multi-part teeth including a core tooth-portion integrally formed with and extending radially from the annular stator ring and at least one additional tooth-portion separate from the annular stator ring,
• wherein core tooth-portions of the plurality of multi-part teeth are circumferentially spaced apart from each other and the at least one additional tooth-portion of each multi-part tooth is disposed on an external surface of the core tooth-portion of that multi-part tooth, the core tooth-portion and the at least one additional tooth-portion being coupled together using an adhesive, wherein a difference between coefficients of thermal expansion of materials of the core tooth-portion, the at least one additional tooth-portion, and the adhesive is less than about 20%, and
• wherein each coil of the plurality of electromagnetic coils is mounted on a different multi-part tooth of the plurality of multi-part teeth such that each coil surrounds a corresponding core tooth-portion of the multi-part tooth with a gap between the coil and the core tooth-portion, and the at least one additional tooth-portion is disposed in the gap.