Electric motors usually comprise a stator and a rotor, with the latter rotating inside the former. Donut Lab thinks this design is outdated, and a hollowed-out rotor can offer important advantages.

The global electric motor rotor shaft market size is projected to grow from USD 2.24 billion in 2024 to USD 4.44 billion by 2034, at a CAGR of 6.4%, according to a new report by Polaris Market ...