When the coupling coil is not energized, no magnetic flux is generated, and the magnetic powder is in a free state. When the active rotor rotates, the magnetic powder is attached to the outside of the working gap due to centrifugal force. The active rotor rotates idly and the clutch cannot transmit torque. At this time, the clutch is not working and is in the off state.

　　When the coupling coil is energized, the magnetic powder is connected in a chain along the magnetic flux. Relying on the shear resistance of the magnetic powder chain and the frictional force of the two moving parts, the active rotor drives the driven rotor to rotate together to transmit torque and movement. When the clutch is in the closed state.

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