| 摘要 |
PURPOSE:To eliminate DC offset created in a filter and suppress the creation of offset in a control system caused by the decline of a DC gain by a method wherein a means which integrates the contents of a memory means which stores deviation components contained in differential speed signals at every turn of a motor is provided. CONSTITUTION:If input data (differential speed signals) 200 in which offset components including DC offset components are superposed are inputted, the offset values are added by an adder 25 and successively held by registers 26A, 26B, 26C and 26D. At that time, an offset value of every turn of a motor is obtained by integration of every turn by an adder 27 and a register 28 and the integral result of every turn is multiplied by L(O<L<1) with a multiplien 29 to obtain a DC offset component. The DC offset components of the respective turns are stored by a register 31 through a switch 30 and deducted from the stored contents of the registers 26A-26D by a deductor 32 to eliminate the DC offset values from the offset values stored by the registers 26A-26D. |
