| 摘要 |
The invention relates to a power supply device for a movable part (12) that rotates around or inside a fixed part. According to the invention, electric current is transmitted between the fixed part and the movable part via contact means that provide an electrical connection between said fixed part and said movable part when the latter is rotating. The contact means essentially comprise rolling means (16) which are disposed between a first ring (10), which is solidly connected to the fixed part, and a second ring (14), which is solidly connected to the rotating part, said rolling elements being made from one or more materials having a Brinell hardness that is greater than 100 HB and a resistivity that is less than 4 mu OMEGA .cm. Moreover, the rolling element (16) under stress is an electrically conductive spring having a diameter which, in rest, is smaller than the space between the external and internal rings (10 and 14).
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