Abstract: A method of forming a portion of magnetic core from a plurality of magnetic ribbons using a former having an electrically conductive coil located about the former has following steps: locating an end of a stack of magnetic ribbon material substantially within the opening of the coil, locating the free end of said stack opposite the first end within the opening of the coil and then applying electric energy to said coil so as to produce a force that draws the ends of said magnetic ribbon towards each other to form the core. Also is disclosed a method for testing for the completion of the assembly of a magnetic core consisting of one or more magnetic ribbons comprising the steps of: measuring one or more electromagnetic characteristics including instantaneous value of the core current and voltage during the process of forming and comparing the said characteristics with a predetermined value.

Abstract: A method of bonding together metallic glass laminations to form a stack and thereafter shaping the stack, for example, by cutting, to form a bulk object such as a wound stator or rotor of an electric motor. Metallic glass is an amorphous ferromagnetic material used in the construction of electrical equipment to reduce core losses. The method involves coating individual laminations of metallic glass with a temperature resistant, non-gas producing metal bonding agent, stacking the coated laminations, applying a pressure to the stacked laminations such that the bonding agent does not exude from between the laminations, allowing the bonding agent to cure, and thereafter shaping the stacked laminations as required. In some cases, temperature resistant wiring and insulation are fitted to the shaped laminations and heated to a temperature sufficient to anneal the metallic glass. The laminations are shaped by cutting with a mixture of fluent material and abrasive material emitted from a nozzle at high pressure.