Torque Generating Device

A torque generating device comprising:

• a rotor configured to be able to perform rotation;
• a sealing member configured to seal a perimeter of the rotor and form a sealing space;
• a field generator that is disposed outside the sealing member such that the field generator is separable from the sealing member and that is configured to generate an electric field or a magnetic field passing through the sealing space;
• a controller configured to control the field generator so as to control a magnitude of the electric field or the magnetic field passing through the sealing space;
• and
• a functional material filled in the sealing space such that the functional material is able to flow so as to vary torque for the rotation of the rotor in accordance with the magnitude of the electric field or the magnetic field passing through the sealing space, wherein
• the sealing member has a support portion configured to support the rotor such that the rotor is able to perform the rotation, and wherein
• the sealing member is provided such that the sealing member is separable from the field generator.