Method for controlling a stepper motor during an acceleration phase and/or a deceleration phase of the motion of rotation of the motor between a start position having a start rotation speed (vstart) and a stop position having a stop rotation speed (vstop), characterized by the following steps: - a first interrogation if the motor is instantaneously running in an acceleration phase or, immediately after switching on the motor, shall run in an acceleration phase, and - a second interrogation if the motor is instantaneously running in a deceleration phase; wherein - if the first interrogation is affirmative, an instantaneous rotation speed (v) of the motor is compared with at least one predetermined transition rotation speed for the acceleration phase, and the instantaneous rotation speed (v) is increased by a first constant acceleration, if the instantaneous rotation speed (v) is lower than the predetermined transition rotation speed, and is increased by a second constant acceleration, if the instantaneous rotation speed (v) is higher than the predetermined transition rotation speed, wherein the first acceleration is higher than the second acceleration and the height of the first and the second acceleration (a1, a2) is selected such high that it just can be reached by means of the torque of the motor which is available in the related rotation speed range, - If the second interrogation is affirmative, an instantaneous rotation speed (v) of the motor is compared with at least one predetermined transition rotation speed for the deceleration phase, and the instantaneous rotation speed (v) is decreased by a first constant deceleration, if the instantaneous rotation speed (v) is higher than the predetermined transition rotation speed, and is decreased by a second constant deceleration, if the instantaneous rotation speed (v) is lower than the predetermined transition rotation speed, wherein the first deceleration is lower than the second deceleration and the height of the first and the second deceleration (d1, d2) is selected such high that it just can be reached by means of the torque or the deceleration moment of the motor which is available in the related rotation speed range, and wherein - If the first and the second interrogation is negated, the motor is operated with the highest or a constant motor rotation speed (vmax). - a first interrogation if the motor is instantaneously running in an acceleration phase or, immediately after switching on the motor, shall run in an acceleration phase, and - a second interrogation if the motor is instantaneously running in a deceleration phase; wherein - if the first interrogation is affirmative, an instantaneous rotation speed (v) of the motor is compared with at least one predetermined transition rotation speed for the acceleration phase, and the instantaneous rotation speed (v) is increased by a first constant acceleration, if the instantaneous rotation speed (v) is lower than the predetermined transition rotation speed, and is increased by a second constant acceleration, if the instantaneous rotation speed (v) is higher than the predetermined transition rotation speed, wherein the first acceleration is higher than the second acceleration and the height of the first and the second acceleration (a1, a2) is selected such high that it just can be reached by means of the torque of the motor which is available in the related rotation speed range, - If the second interrogation is affirmative, an instantaneous rotation speed (v) of the motor is compared with at least one predetermined transition rotation speed for the deceleration phase, and the instantaneous rotation speed (v) is decreased by a first constant deceleration, if the instantaneous rotation speed (v) is higher than the predetermined transition rotation speed, and is decreased by a second constant deceleration, if the instantaneous rotation speed (v) is lower than the predetermined transition rotation speed, wherein the first deceleration is lower than the second deceleration and the height of the first and the second deceleration (d1, d2) is selected such high that it just can be reached by means of the torque or the deceleration moment of the motor which is available in the related rotation speed range, and wherein - If the first and the second interrogation is negated, the motor is operated with the highest or a constant motor rotation speed (vmax).