electric motor 2. According to a preferred embodiment, the rectifier unit of the input stage 4 comprises a single-phase rectification circuity, while the inverter 5 comprises a three- phase inverter having two inputs connected to respective outputs of the rectifier unit and three outputs connected to respective terminals of the electric motor 2. With reference to Figure 3, the inverter-based apparatus 1 further comprises a DC-link 10, in turn comprising two DC-link lines, connecting the outputs of the input stage 4 with the inputs of the inverter 5. The inverter-based apparatus 1 further comprises a capacitor 11, a current sensor 12, and a voltage sensor 13. The DC-link capacitor 11 is connected between the two DC-link lines of the DC-link 10, i.e. between the outputs terminals of the input stage 4. Conveniently, the DC-link capacitor 11 may have a capacitance comprised between about 1 F and about 20 pF. The Applicant has found that using a DC-link capacitor 11 with low- capacitance has the technical effect of increasing the ripple voltage up to 100% so to have a very good harmonic content in the mains current, which allows to eliminate the power factor corrector unit. In other words, using the DC-link capacitor 11 with low-capacitance has the advantage of removing any expensive and bulky power factor corrector circuit specifically designed for correction of harmonics (such as an inductor coupled in series between the mains output and the diode bridge input), since, due to the small capacitance of the DC-link capacitor 11, the rectified current still has a substantial harmonic content. Preferably, the DC-link capacitor 11 may comprise a film type capacitor. The film type capacitor is conveniently less expensive and more durable compared to an electrolytic capacitor. Since the inverter 5 does not comprise an electrolytic capacitor, it corresponds to an “electrolytic-capacitor-lessinverter”. The current sensor 12 can be configured to sense the output currents of the inverter 5 applied to the electric motor 2. With reference to exemplary embodiment illustrated in Figure 3, current sensor 12 may comprise one or more sensors configured to sense the currents provided to the three-phase motor 2, i.e. phase currents iu(t), iv(t), iw(t). It is understood that the time-depedence of the currents iu(t), iv(t), iw(t) is not