The humming sound produced by an induction stove during normal operation is a normal and expected part of its functioning. The sound is primarily caused by the alternating electric currents flowing through the induction coil and the metal cookware placed on top of it.
Here's a breakdown of the process that leads to the humming sound:
Electric current: Induction cooktops use electricity to generate a high-frequency alternating current (AC) in the induction coil. This coil is made of copper or other conductive materials.
Magnetic field: When the alternating current passes through the induction coil, it creates a rapidly changing magnetic field around it.
Interaction with cookware: When you place an induction-compatible pot or pan on the cooktop, the rapidly changing magnetic field induces a corresponding electric current within the metal of the cookware.
Magnetic forces: The induced electric current in the cookware generates magnetic fields that interact with the magnetic field produced by the induction coil. These interactions result in the movement and vibration of the metal molecules in the cookware, which, in turn, generate the humming sound.
The frequency of the alternating current used in induction cooktops is typically in the range of tens to hundreds of kilohertz, which is much higher than the frequency of the alternating current used in household electrical systems (usually 50 or 60 hertz). The higher frequency induces vibrations at a pitch that our ears perceive as a hum.
The intensity of the humming sound can vary depending on several factors, including the power setting of the induction cooktop, the type of cookware being used, and the quality of the cooktop itself. In some cases, using cookware with thicker, more robust bases might reduce the intensity of the sound, as it can dampen the vibrations caused by the magnetic interactions.
While the humming sound can be slightly distracting to some users, it is a normal aspect of induction cooktops and doesn't indicate any issues with the appliance's functionality. The benefits of fast and efficient cooking, along with precise temperature control, often outweigh the minor inconvenience of the humming sound for many users.