| 摘要 |
PURPOSE:To decrease the effect of offset drift by winding coils, through which currents corresponding to current command values are passed, in opposite directions around the same magnetic core, detecting deviations of excitation current values from the current command values with Hall elements arranged in the gaps of the magnetic core, and controlling the excitation currents by feedback based on the deviations. CONSTITUTION:Current command values VINA and VINB are transmitted to current exchangers 101 and 102, converted into currents IINA and IINB, and passed through coils 111 and 112. Excitation currents IOUTA and IOUTB are passed through coils 31 and 32 Hall elements 41 and 42 detect deviations of the excitation current values from the current command values based on magnetic fields generated in magnetic cores 21 and 22 and supply the deviations VDIFA and VDIFB to a drive circuit 9. The drive circuit 9 transmits excitation voltages VA', VB', and VC' proportional to the values of the deviation signals VDIFA and VDIFB and the excitation voltages supply the excitation currents IOUTA, IOUTB, and IOUTC to the coils of each of the phases of a motor 1. |
