| 摘要 |
PURPOSE:To enable to simply adjust the intensity of excitation and reverse excitation by a method wherein the adjustment of excitation and demagnetization of an electromagnet and the regeneration of power source of electromagnetic energy are controlled by an ignition controlling device. CONSTITUTION:The current of an electromagnet is detected by a current detector 16, it is inputted to a comparison circuit 19, the difference between the detected value and a command value is outputted to an ignition circuit 20 as an error signal. The phase control angle is controlled by the circuit 20 in such a manner that the error signal is brought to zero, an ignition signal is given to a thyristor rectification circuit, and the DC voltage in accordance with said signal is outputted. On the other hand, when a reverse excitation current reaches the command value and the residual magnetism is cancelled, a regeneration command is given to the circuit 20 from the control circuit, a power source regenerating operation in which the energy stored in an electromagnet coil is fed back to the power source side is performed, and the electromagnet current is attenuated to zero. As above-mentioned, the adjustment of the intensity of the excitation and the reverse excitation of the electromagnet can be accomplished arbitrarily and easily by adjusting the command value of the current commanding circuit 18. |
