| 摘要 |
<p>Based on rotation information of a synchronous machine (5) detected by rotation information detection means (6), control means (7) cause a converter (2) to boost a charge voltage Vc of a capacitor (3) so as to be higher than an induced voltage Vm generated by the synchronous machine (5) at the time of shifting to a coasting operation, maintain the charge voltage (Vc) during the coasting operation, and perform a weak field control so that the induced voltage (Vm) generated by the synchronous machine (5) becomes lower than a DC voltage (Vdc) at the time of shifting from the coasting operation to a power running operation or to a regenerative operation.</p> |
