| 摘要 |
A motor driving apparatus including a regeneration control function and a power storage device (8) for accumulating a regenerative current and for supplying an inverter section (2) with electric power during acceleration. The inverter section is connected to a converter section (1) by a DC link (3) to which regeneration start detecting means (5) and the power storage device (8) are connected. When the regeneration start detecting means (5) detects that a voltage at the DC link (3) reaches a regeneration control start voltage, a controller (7) controls switching elements (Q1-Q6) and starts regeneration control. The regenerative current is accumulated in the capacitor (9) through a diode (10). When a motor (6) is in a power running state, the switching elements (Q1-Q6) are turned on to apply the voltage at the power storage device (8) to the DC link (3), and the charged power is utilised for motor acceleration. At that time, the regeneration control start voltage for the regeneration start detecting means (5) is made higher, thereby preventing regeneration control from being activated due to application of the capacitor's voltage. Not only the regenerative current is effectively utilised by the power storage device (8), but also the regeneration control function can be utilised. |
