#939: Vacuumotor

Today’s invention is a way to reduce resistance to the motion of the rotor within an electric motor.

This would involve shrouding each of the windings attached to the rotor with a light, tight-fitting, aerodynamic cover (orientated for low drag in the direction of rotation).

A further net decrease in drag on the rotor could be achieved by placing the motor in a shell with a well-lubricated rotary seal around the output shaft.

This would enable the air pressure inside the shell to be maintained at a much reduced level.