The described implementations provide arrangements and procedures for scan converting data into compressed representations of pixel data. The electrical machine includes a stator winding, a rotatable electromagnet, and a voltage regulator. The sliding contact surface of the commutator has a plurality of peaks and valleys that are substantially regularly and alternately arranged in both axial and circumferential directions of the commutator. Sourcedrain regions drawn back from the gate electrode of the field effect transistor structure reduce an overlap capacitance between the gate electrode and the respective sourcedrain regions.