The principle of frictionless operation of dry suction motors

The principle of frictionless operation is the core concept that enables dry suction motors to function without the need for any lubrication, resulting in several advantages over conventional wet suction motors. The key to this principle lies in the generation of adhesion and cohesion forces, which are harnessed through the motor's unique design and the use of air bearings.

The fundamental difference between dry suction motors and traditional wet suction motors lies in their design. Conventional wet suction motors rely on fluid lubrication (usually oil) to reduce friction and wear between moving parts, such as the rotor and stator. On the other hand, dry suction motors eliminate the need for any physical contact between these components, thereby eliminating friction altogether.

The heart of the frictionless operation in dry suction motors lies in two critical components: magnetic levitation and air bearings.

Magnetic Levitation:

Magnetic levitation is the process of suspending an object, in this case, the rotor, in the air using the repelling forces of magnets. The rotor of a dry suction motor is designed with a series of permanent magnets or magnetic assemblies. When an electric current is passed through the coils in the stator, a magnetic field is created. This magnetic field interacts with the magnetic assembly in the rotor, resulting in the generation of torque and causing the rotor to start rotating.

Air Bearings:

Air bearings are essential to the frictionless operation of dry suction motors. They are used to support and suspend the rotor within the stator, maintaining a tiny and consistent air gap between the two components. This air gap is crucial because it prevents any direct physical contact between the rotor and stator, ensuring that friction is minimized.

Once the rotor starts rotating, the air bearings create a cushion of air that lifts and supports the rotor. This suspension relies on two types of forces: adhesion and cohesion forces.

Adhesion Forces:

Adhesion forces occur between the surface of the rotor and the air molecules surrounding it. The air molecules adhere to the rotor's surface due to the attraction between the molecules and the magnetic assembly of the rotor. This adhesion helps to lift and hold the rotor in a stable position.

Cohesion Forces:

Cohesion forces occur between the air molecules themselves. As the rotor spins within the stator, the air molecules form a cohesive cushion that maintains the air gap between the rotor and stator. This cohesive force ensures that the rotor remains suspended and does not make contact with the stator.

With the rotor suspended and supported by the adhesion and cohesion forces within the air bearings, it can rotate freely without any physical contact with the stator. As long as the electric current is supplied to the stator, the magnetic field remains active, and the frictionless rotation continues. The absence of frictional losses contributes to higher motor efficiency and reduced wear and tear, leading to longer motor lifespan and lower maintenance needs.