Method of producing a laminated stator iron core and a laminated rotor iron core

摘要

In a method of producing an iron core by punching and laminating stator core pieces and rotor core pieces from the same metal sheet, it is an object of the invention that magnetic pole teeth of the roughly punched stator core pieces are caused to stably develop by pressing toward space sides made by previously punching the rotor core pieces so as to sufficiently secure punching margins for pressing out the front tips of the magnetic pole teeth of the internal forms of the stator core pieces and the punching can be performed without obstacles even if a gap with the rotor core pieces is small, and further ruggedness formed on a surface of the metal sheet by pressing does not cause disturbances in a flow of magnetic flux. The method comprises punching the rotor core pieces from metal sheets and laminating them, roughly punching the magnetic pole teeth 7 of the stator core pieces from said metal sheets already punched of the rotor pieces, changing positions of the magnetic pole teeth 7, pressing on a plurality of parts thereof to reduce the thickness, developing them toward the punched sides of the rotor core pieces for forming the thin part ranges 10, 11, subsequently punching to form the front tips 8 of the magnetic pole teeth composing edge parts of the internal forms of the stator core pieces, punching the external forms of the stator core pieces and laminating them.