Abstract: A passive drive motor is disclosed. A stator assembly is connected to a base. A rotating shaft is rotatably connected to the base. A rotor assembly is connected to the rotating shaft. The rotor assembly interacts with the stator assembly to rotate the rotating shaft. A first metal disk is rotated by the rotating shaft. At least one first magnet pair is disposed on the first metal disk. A second metal disk opposes the first magnet pair. When the rotating shaft rotates to drive the first metal disk to rotate, the first magnet pair disposed on the first metal disk magnetically interacts with the second metal disk, driving the second metal disk to rotate with respect to the first metal disk.

Abstract: An annular magnet includes a hollow magnet body having an outer circumferential surface that defines a cylindrical shape and an inner circumferential surface that defines an inlet hole. The inlet hole is adapted for receiving a back iron and has a cross-section substantially shaped in an equiangular polygon. The magnet body further has a plurality of magnetic sectors that surround a central axis of the inlet hole where the magnetic sectors correspond respectively to the sides of the equiangular polygon. Each of the magnetic sectors has a magnetic polarity opposite to that of an adjacent one of the magnetic sectors.

Abstract: A rotor includes an axle, a back iron unit, a magnet unit and an adhesive layer. The back iron unit includes annular inner and outer components, and a plurality of plastic components. The inner component is made from a non-metal material and is sleeved on the axle. The outer component is made from a magnetically permeable metal material and surrounds the inner component. The plastic components protrude from an outer surface of the outer component. The magnet unit has a cavity for receiving the back iron unit. The plastic components abut against a cavity-defining surface of the magnet unit that defines the cavity. The adhesive layer is formed in a space between the back iron unit and the magnet unit.

Abstract: A passive drive motor is disclosed. A stator assembly is connected to a base. A rotating shaft is rotatably connected to the base. A rotor assembly is connected to the rotating shaft. The rotor assembly interacts with the stator assembly to rotate the rotating shaft. A first metal disk is rotated by the rotating shaft. At least one first magnet pair is disposed on the first metal disk. A second metal disk opposes the first magnet pair. When the rotating shaft rotates to drive the first metal disk to rotate, the first magnet pair disposed on the first metal disk magnetically interacts with the second metal disk, driving the second metal disk to rotate with respect to the first metal disk.