Automatic commutation displacement of the same value determination for - bldc motors by means of sign of the emf

摘要

The invention relates to a method and a device for the regulation of the commutation instant for the control of a bldc - engine. A sign unit (sgn_U) continuously scans the emf on a motor port (u) in the form of a corrected voltage signal (u_korru) in a commutation interval, in which this motor port (u) is not supplied with current. The sign unit (sgn_U) generates a sign signal (sig_U). A subsequent fourth integrator (int_2U) integrated and / or filters the arithmetic sign signal (sig_U) to form an integrated arithmetic sign signal (s_2U). A subsequent first integrator (int_1U) produced by integration and / or filtering of the corrected voltage signal (u_korru) an associated threshold value signal (s_1U). A comparator (cmp_2U) compares the threshold value signal (s_1U) with a predetermined value (v_U). As a function of the comparison result (cmp_2U) forms of the comparator (cmp_2U) a commutation signal (a₁). As a function of the commutation signal (a₁), , the commutation instant of an associated output of a drive block (st), which, with the associated motor port (u, v, w) is connected, is also modified. A second adder (su_2U) added to the standard value (v_U) , with the integrated arithmetic sign signal (s_2U) to a load value (s_3U). Of the drawer values (s_3U) in a sampling - hold circuit (saw_U) triggered with the flank of the commutation signal (a₁) and stored as a predetermined value (v_U) used for the said comparator. The generation of the new standard value (v_U) takes place as a function of the current memory value of the sampling - hold circuit (saw_U).