Electric machine comprising an electric motor and a gear arrangement and electric power tool comprising such a machine

An electric machine (300), comprising an electric motor (15), a working element (9) realizing a working movement (11), when the electric motor (15) is activated, and at least one gear arrangement functionally located between the electric motor (15) and the working element (9) for transmitting a rotational movement and torque from the electric motor (15) to the working element (9) in order to realize the working movement (11), wherein the electric motor (15) has a stator (100) with electrical windings (102) and a rotor (104) with permanent magnets (106) mounted thereon, characterized in that the at least one gear arrangement includes, or takes the form of, a magnetic gear arrangement (20) using magnetic fields to transmit the rotational movement and torque from the electric motor (15) to the working element (9) without mechanical contact, the magnetic gear arrangement (20) having three principle components (51, 52, 54) which rotate relative to each other about a rotational axis (60), the three principle components (51, 52, 54) comprising a first rotating component (52) generating a first magnetic field with a first number (n_input) of magnetic pole pairs (56), a second rotating component (54) generating a second magnetic field with a second number (n_output) of pole pairs (58), and a third rotating component (51) having a third number (n_pp) of ferromagnetic pole pieces (50), the third rotating component (50, 51) acting as a passive part of a magnetic circuit between the first rotating component (52) and the second rotating component (54), that the rotor (104) of the electric motor (15) extends in an axial direction beyond the stator (100) of the electric motor (15), wherein the first number (n_input) of magnetic pole pairs (56) is provided on an extended part (108) of the rotor (104) in order to make the extended part (108) of the rotor (104) together with the first number (n_input) of magnetic pole pairs (56) form the first rotating component (52) of the magnetic gear arrangement (20).