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This alternator is designed to provide power to a smart water meter. It mounts inside the meter and is rotated through a magnetic coupling.

When the water flows, the alternator generates enough electricity to recharge the onboard battery. The unit includes battery charging electronics and circuit protection.

It is a coreless design. The lack of cogging lets the alternator begin spinning as soon as the ball bearing friction is overcome.

The water meter concept is patented by the meter manufacturer. However, the same principle can work in other water flow applications.

Battery charging current