Method to manufacture improved exciter for an electrical generator

A method to manufacture an improved exciter for a generator, said exciter comprising an exciter rotor and an exciter stator, the exciter rotor and the exciter stator each being formed of a respective set of laminations, of a same electrical steel comprising the steps of:

• providing a coil of cold rolled electrical steel which after cold-rolling was not subsequently annealed, said electrical steel being full hard which is a condition of the electrical steel in which there is no further change in hardness or tensile strength of the steel following cold rolling and prior to a subsequent anneal, said steel consisting essentially of the following elements in weight percent:
• Carbon
• less than 0.04%,
• Manganese
• 0.10% to 1.5%,
• Phosphorus
• 0.005% to 0.12%,
• Silicon
• 0.80% to 1.60%,
• Aluminum
• 0.05% to 1.0%,
• Tin or Antimony less than or equal to 0.12%, and
• Iron and conventional impurities as balance;
• without a prior annealing of the full hard cold rolled steel coil, slitting the coil to create at least one strip;
• stamping the at least one strip to create a plurality of exciter rotor laminations and a plurality of exciter stator laminations from the same strip;
• separating the exciter rotor laminations from the exciter stator laminations and creating said set of exciter rotor laminations and said set of exciter stator laminations;
• from among said sets of exciter rotor laminations and exciter stator laminations, annealing only said set of exciter rotor laminations;
• and
• assembling the annealed set of exciter rotor laminations to create said exciter rotor and assembling the set of not annealed stator laminations to create said exciter stator.