| 摘要 |
<p>The rotating frequency converter is particularly for use in supplying power at 400 Hz derived from a normal 60 Hz supply, for computer installations. The converter is intended for use at high power levels and runs at 3000 to 3600 rpm with an audible noise level of 67 db. The sound level is minimised by the use of a fan driven ventilation system employing sound absorbent cladding in the ducting and casing. The ventilating fan is mounted on the shaft of the converter which is in a chamber below an upper chamber, the chambers being connected by an end passage. The upper chamber has control and switching units on either side of a central partition parallel to the converter shaft. At the ends of the upper chamber are vertical partitions extending upwards and downwards from the base and roof of the chamber respectively to define a labyrinthine air path to the end outlet.</p> |
