| 摘要 |
PROBLEM TO BE SOLVED: To provide a driver which is highly efficient and applicable even at high revolution, without using a microcomputer. SOLUTION: Voltages Vf which is proportional to the number of revolutions is generated by converting a positional signal H detected with a position detector 19u from frequency into voltage, and a DC-linked current 11 detected with a current detector 21 is inputted into a peak holding circuit 22 to generate a voltage Vp proportional to the load torque. A pulse generation circuit 24 generates single-shot pulses P where the width of the pulse deceases with respect to the increase in the added voltage Va of both voltages Vf and Vp, and a current application control circuit 25 gives commutation signals Sup-Swn which have phases delayed by the pulse width, with the phases of position signals Hu, Hv, and Hw as references, to the switching elements 2-7 of an inverter circuit 14. |
