Nikola Tesla in his patent claimed that the electrical part of his electromechanical oscillator controlled the frequency of the whole device. The electrical part was a generator.He claimed that this generator winding also acted as a motor applying force back on the shaft. Let’s explore why this is not possible.
Suppose a copper coil carrying AC current is placed in the magnetic field, and is moved upward. The magnetic field flows from left to right. The current direction for the left conductor is inside and the on the right side conductor current flows outside. Consider the first case where the coil is moving up.
If you apply fleming’s right hand rule, the force on the left side conductor of coil is in the downward direction. Simultaneously on the right sided conductor the torque is in the upward direction. Therefore as the current flowing through both the conductors is same, the forces cancel each other and there is no resultant force.
So Tesla must have made use of a different type of coil connection. We have deduced one. All you need is that the current should flow in the same direction in both the left and right conductors of the coil. But how is that possible when both the conductors are one circuit. To solve this, just take two coils and wound them diagonally criss-cross. At both ends of the rod, just connect the ends of these coils to each other to form a single input and output. This works!