| 摘要 |
PURPOSE:To detect a torque with high calculating accuracy at low speed operation time without influence of a noise by detecting an armature current, a DC voltage of main circuit and only ON/OFF signal of a transistor to calculate the torque. CONSTITUTION:An A/D converter 14h inputs a capacitor voltage Vc of a DC current from a voltage detector 13 and converts into a digital amount. A/D converter 14f, 14g input motor currents iUF, iVF from a current detector 11 and converts to a digital amount. An interface circuit 14i connects the ON/OFF digital signal of transistors Tr4, Tr5, Tr6 from 3-phase pulse width modulators 9 with an I/O interface circuit 14d. A microprocessor 14a obtains a torque Te by calculating on the basis of the inputs. |
