Rotor for motor tacho-generator

A rotor for tacho-generator having axially extending teeth and grooves arranged at a rotor circumference, said grooves being defined by a bottom located radially inward from said rotor circumference and adjacent to outwardly extending sides, which sides define sides of said teeth, and wherein said grooves receive rotor windings, wherein said windings enclose at least one of said teeth, the improvement comprising:

• that said rotor is formed as a compact disk means;
• that said disk means is essentially homogenous ferromagnetic material that carries out magnetic reversal only with considerable inertia;
• that said bottom of said grooves in axial view of the disk means has a width at least twice as wide as a width of said teeth at said bottom;
• and wherein the grooves narrow slightly from the bottom radially outward
• that each of said teeth in axial view of the disk means have corner area means that are beveled in a chamfer manner to define an angle with an adjacent side of each of said teeth to allow said winding to extend radially toward the outside of said teeth that are directly adjacent the at least one of said teeth and toward the outside of said rotor winding.