Adjustment system for a vehicle for adjusting a vehicle seat component or as part of a window winder, wherein the adjustment system comprises a motor arrangement and is connected to the on-board voltage of the vehicle, wherein the motor arrangement comprises: a DC commutator motor for adjusting the vehicle component, wherein the commutator motor comprises: armature windings, a commutator with segments arranged distributed in the circumferential direction, two brushes resting on the segments for supplying current to the armature windings and for receiving ripple current signals (Ir) generated in the armature windings, a motor shaft, a set of magnets for producing a magnetic field, wherein the armature windings and the commutator are mounted as a rotatable rotor on the motor shaft, and a control device for supplying the two brushes with a direct voltage ( and for receiving and evaluating the ripple current signals (Ir) by a ripple counter method for determining a position of the commutator motor and/or for registering and regulating the rotational speed, characterised in that the magnetic field is a four-pole magnetic field, a brush coverage with which a brush rests with its bearing surface on a segment, is less than 100% in order to prevent a wear-produced coverage of three segments, wherein each brush rests either on one segment or both brushes simultaneously lie on two adjacent segments, so that the two brushes always simultaneously short-circuit two adjacent brushes, wherein the control device when determining the position of the electric motor determines a motor rotation from a number of ripple current signals (Ir), wherein a number of ripples per rotation corresponds to the number of segments (n). a DC commutator motor for adjusting the vehicle component, wherein the commutator motor comprises: armature windings, a commutator with segments arranged distributed in the circumferential direction, two brushes resting on the segments for supplying current to the armature windings and for receiving ripple current signals (Ir) generated in the armature windings, a motor shaft, a set of magnets for producing a magnetic field, wherein the armature windings and the commutator are mounted as a rotatable rotor on the motor shaft, and a control device for supplying the two brushes with a direct voltage ( and for receiving and evaluating the ripple current signals (Ir) by a ripple counter method for determining a position of the commutator motor and/or for registering and regulating the rotational speed, armature windings, a commutator with segments arranged distributed in the circumferential direction, two brushes resting on the segments for supplying current to the armature windings and for receiving ripple current signals (Ir) generated in the armature windings, a motor shaft, a set of magnets for producing a magnetic field, wherein the armature windings and the commutator are mounted as a rotatable rotor on the motor shaft, and a control device for supplying the two brushes with a direct voltage ( and for receiving and evaluating the ripple current signals (Ir) by a ripple counter method for determining a position of the commutator motor and/or for registering and regulating the rotational speed, characterised in that the magnetic field is a four-pole magnetic field, a brush coverage with which a brush rests with its bearing surface on a segment, is less than 100% in order to prevent a wear-produced coverage of three segments, wherein each brush rests either on one segment or both brushes simultaneously lie on two adjacent segments, so that the two brushes always simultaneously short-circuit two adjacent brushes, wherein the control device when determining the position of the electric motor determines a motor rotation from a number of ripple current signals (Ir), wherein a number of ripples per rotation corresponds to the number of segments (n).