| 摘要 |
A concrete vibrator system having a vibrating body (2) moved by an AC motor (6) for transmitting vibrations to a mass of liquid concrete, and at least one driving circuit (3), for actuating the AC motor (6). The driving circuit (3) has a power switching supply (8), which receives a first AC voltage (Vs) from an external power source and supplies a DC voltage (Vdc) of amplitude (VM2) lower than that of the first AC voltage (Vs), and a DC/AC inverter (9), which is connected between the switching power supply (8) and the AC motor (6) for transforming the DC voltage (Vdc) into a second AC voltage (Vac) to be supplied to the AC motor (6), having an amplitude (VM1) lower than and a frequency (FM) higher than the respective amplitude and frequency of the first AC voltage (Vs). |
