What is the working principle of a DC cooling fan?
Category:
Industry Trends
Release time:
2020-07-13
DC cooling fan The working principle is based on energy conversion, specifically: electrical energy → electromagnetic energy → mechanical energy → kinetic energy. The circuit principles generally come in various forms, and the circuits employed...
Similarly, the performance of the fans will differ.
The cooling fan operates on the principle of electromagnetic induction, using a Hall-effect sensor as a synchronous detection device to control a set of circuits. By switching the energization sequence of the windings, it generates a rotating magnetic field, thereby achieving electronic operation.
A new type of electromechanical fan with phase-switching capability. This cooling fan boasts significant advantages in terms of wide speed regulation range, lightweight design, environmental friendliness and energy efficiency, controllability, reliability, environmental tolerance, and cost-effectiveness.
Its advantages are gradually replacing other types of motors in fields that demand high performance, thereby establishing a dominant position.
The cooling fan is powered by direct current. A DC motor consists of two main parts: the stator and the rotor. The stator is equipped with magnetic poles (either wound or permanent magnet type), while the rotor has windings. During operation,
After the device is energized, a magnetic field (magnetic poles) is also generated on the rotor. There is an angle between the magnetic poles of the stator and the rotor. Under the mutual attraction between the magnetic fields of the stator and rotor (between the N poles and S poles), the motor rotates.
The cooling-fan technician told us that by changing the position of the brushes, we can alter the angle between the stator and rotor magnetic poles—assuming the stator’s magnetic pole serves as the initial side of the angle and the rotor’s magnetic pole forms the other side.
The direction in which the magnetic poles of the rotor point toward the magnetic poles of the stator determines the motor’s rotation direction. After performing this operation, you can reverse the motor’s rotation direction.
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