| 摘要 |
<p>An electrical power generator for powering circuitry (57) on a ve hicle wheel, has a first part for generating an energy field, a nd a second part which is movable relative to the energy field, e.g.a magnet (40) and coil s (30), to generate the electrical power, both the first and the second part being suitable for operation located on the wheel. The first part falls freely along a channel defi ning a circumferential path around the wheel, as the wheel rotates, so that the free falli ng part passes the othe r of the two parts to generate the electrical power. By having both parts mounted on the wheel, no sliding contacts or wireless power transmission are needed to conduct the power to the circuitry on the wheel, and relative alignm ent of the parts is easier to achieve and maintain in all conditions th an if one is mounted on a body of the vehicle. Rotational imbalance can be much reduced, for a given mass. It can be used for tire pressure monitoring systems.</p> |
