Square Coil

Square coils are a common type of electronic component, usually made by winding wires around a square frame or core. Here is a detailed introduction about it:

Structural composition

Wires: Generally, copper wires such as enameled wires and silk-covered wires are used to carry current and generate magnetic fields.

Skeleton or core: Common materials include plastic, ferrite, etc., which provide support and fixation for the wires and also affect the magnetic performance of the coil.

Insulating coating: It is used to isolate wires, prevent short circuits, suppress insulation loss and electromagnetic interference.

Type characteristics

Square Helmholtz coil: Composed of two parallel square coils with appropriate spacing, it can generate a relatively uniform magnetic field. Its characteristics include a large uniform zone volume and an open space, making it suitable for testing larger samples. It can be designed as one-dimensional, two-dimensional, or three-dimensional coils and is often used in fields such as generating standard magnetic fields and simulating geomagnetic environments.

Square winding coil: Usually wound in multiple layers, it can be used in equipment such as motors. Its cross-section is square, which can better adapt to square or rectangular spatial layouts and improve space utilization.

Square wireless charging coil: Generally, it is made by winding copper wire around a square flat ferrite core. The magnetic flux is output and input from the side of the flat core. It has a relatively large allowable tolerance for horizontal misalignment, but electromagnetic wave leakage is often more serious.

Performance parameters

Inductance value: Determined by factors such as the number of turns of the coil, core material, and size, it is one of the important parameters of square coils, affecting the energy storage of the coil in the circuit and its hindrance to current changes.

Resistance: It is related to the material, length, cross-sectional area, etc. of the wire. The magnitude of resistance will affect the power loss and heat generation of the coil.

Uniformity: For square Helmholtz coils and the like used to generate uniform magnetic fields, uniformity is a key parameter, which indicates the degree of uniformity of the magnetic field within a certain spatial range.

Application field

Electronic devices: Widely used in automobiles, household appliances, medical equipment, communication devices and other products, they are used to regulate current, store energy and control the operation of equipment, etc.

Wireless charging: In fields such as wireless charging for mobile phones, square coils are adopted by some manufacturers due to their relatively large tolerance for horizontal misalignment and other features.

Scientific research: It can be used for calibration of Hall probes and various magnetometers, research on biological magnetic fields, and study on the magnetic properties of substances, etc.