BA Finish Stainless Steel Coil Insulated wires
The coil usually refers to a loop of wire winding, and the most common coil applications are: motors, inductors, transformers, and loop antennas. The coil in the circuit is the inductor. The conductor is a single piece of wire, and the conductor is insulated from each other, while the insulator can be hollow and can contain iron core or magnetic powder core, or electrical inductance. Inductance can be divided into a fixed inductance and a variable inductance, a fixed inductance coil, or inductance, or coil. Is expressed with L, Henry (H), Henry (mH), Henry (uH), 1 H = 10 ^ 3 mH = 10 ^ 6 uH.
Classification of inductance
Classification by inductance: fixed inductance, variable inductance.
According to the magnetic properties of the magnetic field: empty core coil, ferrite coil, iron core coil, copper core coil.
Classification by work: antenna coil, oscillation coil, choke coil, trap coil, deflection coil.
By winding structure: single-layer coils, multilayer coils, and beehive coil.
The inductance L is the intrinsic characteristic of the coil itself, independent of the current size. In addition to the special inductance coil (color code inductance), the inductance is generally not marked on the coils, but in particular names.
The inductance coil is the magnitude of the resistance to ac current and the unit is ohm. It has a relationship with the inductance L and the ac frequency f to XL = 2 PI fL
The quality factor
The quality factor Q is the quantity of the quality of the coils, and Q is the ratio of the resistance XL to the equivalent of the resistance, which is Q = XL/R.
The higher the Q value of the coil, the smaller the loss of the loop. The q-value of the coil is related to the current resistance of the conductor, the dielectric loss of the frame, the loss of the shield or core, the influence of the high frequency skin effect. The coil's Q is usually a few tens to a few hundred.
The capacitance between the turn of the coil and the turn, the coils, and the shield between the coils and the underplate is called the distributed capacitance. The presence of distributed capacitance makes the coil's Q value lower and the stability variable, so the coil's distribution capacity is smaller and better.
The single-layer coils are enclosed in a loop of insulated wire around a paper tube or a bakelite skeleton. Such as a transistor radio wave antenna coil.
The single-layer winding is the winding of a single coil in each stator slot, and the total number of coils is only half the number of the motor's total. The advantage of single layer winding is that the winding winding number is relatively simple. There is no room for increased utilization of the slots; Single layer structures do not occur with alternate breakdown. Disadvantages produced by electromagnetic wave shape is not ideal, is winding motor iron loss and noise are large and starting performance also is a bit poor, so the single layer winding asynchronous motor only commonly used for small capacity.