The sensor is fixedly attached to the bicycle brake at a location to detect rotational behaviour of a bicycle wheel by sensing the magnet mounted to the air valve stem.
The magnetwheel is a permanent magnetism rubber wheel which is vulcanized into moulding by milling the rubber and the magnet powder, and then is magnetized.
它主要由磁轮和支架组成，磁轮是用橡胶和磁铁粉经混炼硫化成型后，再充磁而成的永磁胶轮。
3
In this paper, the principle of different types of permanent magnetwheel motor is introduced and the recent investigation of the world is summarized.