Rotor and rotating electrical machine with embedded permanent magnet

A rotor in a rotating electrical machine comprising;

• permanent magnets embedded in the rotor core, and
• magnetic flux short circuit preventive holes extending from the circumferential ends of said permanent magnets constituting magnetic poles to the vicinity of outer periphery of said rotor core;
• said rotor being a rotor with embedded permanent magnets further characterized in that,
• when the axis extending in the center direction of the magnetic pole of said rotor is assumed as d-axis, and the axis extending in the interpolar direction 90 degrees deviated from the center direction of said magnetic pole in terms of electric angle is assumed as q-axis,
• an angle with respect to the rotor center formed between the ends of two adjacent magnetic flux short circuit preventive holes on the d-axis side is smaller than the angle formed by the outer periphery of said permanent magnet with respect to the rotor center, and
• the radial distance between the outer periphery of said magnetic flux short circuit preventive hole and that of said rotor core is increased gradually in conformity to the approach to d-axis side from q-axis.

A rotating electrical machine equipped with a rotor comprising;

• permanent magnets embedded in the rotor core, and
• magnetic flux short circuit preventive holes extending from the circumferential ends of said permanent magnets constituting magnetic poles to the vicinity of outer periphery of said rotor core;
• said rotating electrical machine further characterized in that said magnetic flux short circuit preventive hole is formed in such a way that the radial distance between the outer periphery of said magnetic flux short circuit preventive hole and that of said rotor core is increased gradually in conformity to the approach to the pole from interpolar position;
• and
• an angle with respect to the rotor center formed between the ends of two adjacent magnetic flux short circuit preventive holes on the interpolar side is smaller than the angle formed by the outer periphery of said permanent magnet with respect to the rotor center.