| 摘要 |
PURPOSE:To reduce the size and to improve the energy efficiency by absorbing small regenerative energy of an elevator by a storage battery, and consuming a large regenerative energy which cannot be absorbed by the battery via a resistor. CONSTITUTION:When an elevator is in a regenerative mode, regenerative energy is returned to a DC power source side through a free wheel diode connected in anti-parallel with the transistor of an inverter stack 3, and the regenerative energy is not absorbed by a storage battery 12. When the regenerative energy increases and the battery 12 cannot completely absorb the regenerative energy, a detector 9 for detecting an inverter DC voltage operates to turn ON a regenerative energy absorbing power transistor 10, and the energy is consumed via a resistor 11. |
