Abstract: A brushless electrical machine with permanent magnet excitation, designed for propulsion, in particular of boats, pumps, electric vehicles, for operation as a servomotor, etc. The brushless electrical machine provides increased power at significant reduction of the weight and the inertia moment of its rotor. The rotor (11) comprises an outer (12), intermediate (13) and inner (14) steel rings. The surface of the poles of the rotor (11) is formed by interconnected cut-out parts (15). In the rotor (11), above the permanent magnets (17) are formed elongated axial slots (20). By number of poles 2 p less than 16 and at a diameter of the rotor (11) greater than 0.15 m, the axial slots (16) are divided into two equal parts by a third radial rib (25) with maximum width 0.0025 m, which is located under the middle of the cut-out part (15) and is connecting the intermediate ring (13) to the outer ring (12).