Patent ID: 7170209

Claim:
A rotor for a reluctance type rotating machine comprising: a rotor core formed by stacking a number of annular core materials each of which includes magnetic concave and convex portions alternately formed on an outer circumference thereof and a central through hole, the rotor core having two keys which are formed at two positions on an inner circumference of the rotor core so as to extend axially, respectively, the positions being spaced 180 degrees apart from each other with respect to the rotor core, the rotor core being divided into a plurality of blocks, the core materials constituting at least one block having the magnetic concave and convex portions shifted by a predetermined angle relative to the core materials constituting the other or another block on the basis of a center line passing through the keys, wherein a whole or part of the core materials of said at least one block are located circumferentially 180 degrees apart from the corresponding core materials constituting said other or another block; and a rotational shaft inserted through the central hole of the rotor core, the shaft having two key grooves engaging the keys of the rotor core respectively.