DRIVE MOTOR RATIFICATION AND SYSTEM FOR USE IN THE DRIVE.

摘要

A drive arrangement is described, comprising a multi-phase synchronous motor (1) whose phase windings (11, 12, 13) are energised with energising currents whose strengths are periodic functions (f1, f2, f3) of a rotor-position or translator-position measurement value (p) which is determined by means of an incremental detection system (14, 15, 20). The drive arrangement comprises means (20) for adjusting the initial position-measurement value (p) before the motor (1) is energised with the periodic energising currents. For determining the initial value the phase windings (11, 12, 13) are energised in different consecutive time intervals (T) with measurement alternating currents (im1, im2, im3) whose amplitudes are equal to K times the function values (f1, (ROPOS), f2(ROPOS), f3(ROPOS)) of the periodic functions (f1, f2, f3) associated with different auxiliary values (ROPOS). The frequency and amplitudes are selected in such a way that the rotor or translator performs a vibration whose vibration amplitude corresponds to only a few electrical degrees. The auxiliary value (ROPOS) is determined for which the ratio between the amplitude and the value of K is maximal and, subsequently, the initial position-measurement value (p) is adjusted to this optimum value, so that the initial value is adjusted to a value for which the force produced by the energising currents is maximal.