Patent ID: 7683515

Claim:
An electrical drive, comprising: stationary outer ( 5 , 6 ) and inner ( 11 , 11 a ) stators; a rotatably mounted rotor provided with at least one pot-shaped element ( 8 , 18 , 28 , 38 , 58 ) having a cylindrical wall ( 8 a , 18 a , 28 a , 38 a , 58 a ) as well as a base wall ( 8 b , 18 b , 28 b , 38 b , 58 b ), wherein said cylindrical wall is thin-walled and is made of a magnetic material, wherein said base wall extends perpendicular to an axis of a rotor shaft ( 1 , 39 , W) and said cylindrical wall extends coaxial thereto, and wherein said base wall is connected to said rotor shaft to enable transfer of torque; at least one electrical excitation coil ( 12 , 15 , 32 ); and a plurality of permanent magnet elements ( 14 , 34 , 54 ) secured to said rotor for producing an excitation flux, wherein said permanent magnet elements rest only against a radially inner side of said cylindrical wall ( 8 a , 18 a , 28 a , 38 a , 58 a ) and in a circumferential direction are disposed next to one another, wherein said permanent magnet elements ( 34 , 54 ), together with said outer and inner stators ( 5 , 6 ; 11 , 11 a ), form magnetic circuits that pass radially entirely through said cylindrical wall, and wherein said permanent magnet elements have a radial thickness that is greater than a thickness of said cylindrical wall.