AlNiCo磁铁固定在驱动轴上并随轴旋转。 A metallic cup cover AlNiCo magnet which serves as coils, and there exists a certain gap between AlNiCo magnet and cup.金属杯盖用作线圈的AlNiCo磁铁，并且AlNiCo磁铁和杯之间存在一定的间隙。 Low end of speedometer's needle fix together with metallic cup while connect with a hair spring.车速表的低端指针与金属杯固定在一起，并与游丝相连。 Hair spring will ensure needle swing's steady and reset timely.游丝将确保针摆稳定并及时复位。 The front wheel drives the gears rotates during motorcycle is running, then turn AlNiCo magnet on the drive shaft.在摩托车行驶期间，前轮驱动齿轮旋转，然后转动驱动轴上的AlNiCo磁铁。 At this point, lines of flux between AlNiCo magnet and metallic cup will be cutting, thus generate an induced current and magnetic field.此时，AlNiCo磁体和金属杯之间的磁通线将被切割，从而产生感应电流和磁场。 The metallic cup will rotate due to interaction between the induced magnetic field and AlNiCo's magnetic field.由于感应磁场和AlNiCo磁场之间的相互作用，金属杯将旋转。 The damping effect of hair spring will affect the rotation of the metallic cup, and the needle will rest on the certain speed when cup's torque is equal to damping torque of hair spring.游丝的阻尼效果会影响金属杯的旋转，并且当杯的扭矩等于游丝的阻尼扭矩时，针将停留在一定的速度上。 The higher speed leads to stronger torque and thus obtains more wide swing angle.较高的速度导致较强的扭矩，因此获得更大的摆角。 The counter is composed of three pairs of worm gears and drum.计数器由三对蜗轮和鼓组成。 The rotating flexible shaft will drive end worm gear, and gear will turn a circle when flexible shaft turned 1000 circles, then raised claw will stir digits on the drum.旋转的挠性轴将驱动端部蜗轮，挠性轴旋转XNUMX圈时齿轮将旋转一圈，然后升高的爪将搅动滚筒上的手指。 Speedometer magnets are fabricated by车速表磁铁由 铸造过程，AlNiCo 2和AlNiCo 3均可用于此应用。
