As a ground transportation

the tram needs frequent speed regulation. Relying on mechanical braking when decelerating will cause excessive wear of the mechanical devices. Therefore

it is proposed to install a permanent magnet reduction device on the tram. In this paper

a permanent magnet deceleration device was designed without changing the original brake control system of the tram and its associated mechanism. The position of the magnetic pole of the permanent magnet was changed by the actuating mechanism to obtain different spatial magnetic fields

to achieve the purpose of obtaining different induced eddy currents and corresponding braking torques on the turntable

which achieved the conversion of braking and mitigation. Under the limited space of the tram

the structural size of the deceleration device and the braking torque of the deceleration target were derived. The mathematical model of the eddy current braking torque was established

and the influence of structural parameters on the braking torque was analyzed. The prototype was developed and the performance parameters were verified to meet the design requirements.