Conventional rotating electrical machines, such as motors and generators, consist of two primary components: the stator and the rotor, separated by an air-gap. The presence of this air-gap enables the rotation of the rotor concerning the stationary stator. This rotation is achieved by supporting the rotor and stator on two ball bearings situated on opposite sides of the machine. Specifically, the stator is mounted on the stationary rings of the ball bearings, while the rotor is fixed to the moving rings of the ball bearings.

 

However, if the bearings fail, contact between the stator and rotor can occur, resulting in severe damage to the machine. Additionally, worn-out bearings can lead to reduced motor performance, lower rotational speed, and decreased output power, ultimately affecting the overall performance of the driven system. Furthermore, shaft misalignment is a common cause of damaged bearings, adversely impacting the motor's ability to transmit power efficiently. Broken bearings may also release debris or particles into the motor, causing further damage and affecting other components.

 

To enhance the rotor speed relative to the synchronous speed of the stator's traveling magnetic field, mechanical gearboxes are frequently connected to permanent magnet machines. However, these intricate mechanical devices encompass shafts, gearing, bearings, and other components, and a failure in any of these parts can damage the entire gearbox, leading to costly repairs. Moreover, similar to ball bearings, gearboxes necessitate frequent maintenance due to wear and tear. In addition, these mechanical components contribute to the overall high cost, weight, and volume of electromechanical systems, while also generating noise and vibrations.

                                                                                                                 

Our invention proposes a novel concept for a gapless rolling electric machine, aiming to eliminate the need for conventional ball bearings and gearboxes.

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