A bifilar coil, also known as a pancake coil, is used in an induction stove for several reasons, primarily related to its efficiency and heating capabilities in the context of induction cooking. Here are the key reasons why a bifilar coil is employed in an induction stove:
Enhanced Induction Efficiency: The bifilar coil design improves the efficiency of the induction process. In induction cooking, an alternating current (AC) passes through the coil, generating a magnetic field. This magnetic field induces eddy currents in the ferromagnetic cookware placed on the stove's surface. These eddy currents, in turn, generate heat in the cookware, allowing for efficient and rapid cooking.
Uniform Heating: The bifilar coil is wound in a flat, circular shape, resembling a pancake, which allows for more uniform heating across the cooking surface. This design ensures that the magnetic field is evenly distributed, leading to consistent and predictable heat distribution in the cookware.
Space Optimization: Induction stoves typically have limited space underneath the glass-ceramic surface where the coils are placed. The bifilar coil's flat design allows it to fit neatly in this confined space, making it a practical choice for induction cooktops.
Reduced Energy Loss: Bifilar coils help reduce energy losses due to magnetic fields extending beyond the cookware's base. The pancake shape concentrates the magnetic field within the cookware's area, resulting in less wasteful energy dispersion.
Safety: The flat design of the bifilar coil ensures that the distance between the coil and the cookware remains consistent, reducing the risk of magnetic interference and potential safety hazards.
Better Coil Cooling: The pancake coil's flat design allows for improved heat dissipation compared to other coil shapes, which can help prevent overheating and extend the life of the induction stove.
While the bifilar coil is a popular choice for induction stoves, it's important to note that there are variations in coil designs and materials used in different stove models. These variations can affect factors such as heating efficiency, performance, and overall cooking experience. Manufacturers carefully consider these factors to provide efficient and reliable induction stoves for consumers.