Electromagnetic coil 14550884 for Volvo excavator

Edit main performance indicators

The performance index of inductance coil is mainly the size of inductance. In addition, generally speaking, the wire wound with inductance coil always has a certain resistance, which is usually very small and can be ignored. However, when the current flowing in some circuits is very large, this small resistance of the coil can not be ignored, because a large current will consume power on the coil, causing the coil to heat up or even burn out, so sometimes the electric power that the coil can withstand should be considered.

Inductance

The inductance l represents the inherent characteristics of the coil itself, regardless of the current. Except for the special inductance coil (color-coded inductance), the inductance is generally not specially marked on the coil, but marked with a specific name. Inductance, also known as self-inductance coefficient, is a physical quantity indicating the self-inductance ability of inductor. The inductance of the inductor mainly depends on the number of turns of the coil, the winding mode, the presence or absence of the core and the material of the core, etc. Generally, the more coil turns and the denser coils are wound, the greater the inductance. The inductance of the coil with magnetic core is larger than that of the coil without magnetic core; The greater the magnetic permeability of the core, the greater the inductance.

The basic unit of inductance is Henry (Hen for short), which is represented by the letter "H". Commonly used units are milli-Heng (mH) and micro-Heng (μH), and the relationship between them is:

1H=1000mH

1mH=1000μH

Inductive reactance

The magnitude of the resistance of the inductance coil to AC current is called inductance XL, with ohm as the unit and ω as the symbol. Its relationship with inductance L and AC frequency F is XL=2πfL.

Quality factor

The quality factor Q is a physical quantity representing the coil quality, and Q is the ratio of inductance XL to its equivalent resistance, that is, Q = XL/R.. It refers to the ratio of inductance to its equivalent loss resistance when an inductor works under a certain frequency AC voltage. The higher the Q value of the inductor, the smaller the loss and the higher the efficiency. The q value of the coil is related to the DC resistance of the conductor, the dielectric loss of the skeleton, the loss caused by the shield or iron core, the influence of high frequency skin effect and other factors. The q value of the coil is usually tens to hundreds. The quality factor of the inductor is related to the DC resistance of the coil wire, the dielectric loss of the coil frame and the loss caused by the core and shield.