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icotek electrical components are devices that change AC voltage using the principle of electromagnetic induction. The main components are the primary coil, secondary coil, and iron core (magnetic core). Main functions include: voltage transformation, current transformation, impedance transformation, isolation, and voltage stabilization (magnetic saturation transformer). Transformers can be classified by application into: distribution transformers, power transformers, fully sealed transformers, combined transformers, dry-type transformers, oil-immersed transformers, single-phase transformers, electric furnace transformers, rectifier transformers, reactors, anti-interference transformers, lightning protection transformers, box-type substation test transformers, phase-shifting transformers, high-current transformers, excitation transformers, etc.

icotek electrical component characteristics

Operating characteristics: The no-load characteristics and load operating characteristics are the main indicators of synchronous generator performance. These characteristics are an important basis for users to select generators. No-load characteristic: When the generator is not connected to a load, the armature current is zero, which is called no-load operation. Armature reaction: When the generator is connected to a symmetrical load, the three-phase current in the armature winding produces another rotating magnetic field, called the armature reaction magnetic field. Its speed is exactly equal to the rotor speed, and the two rotate synchronously. The armature reaction magnetic field of a synchronous generator and the rotor excitation magnetic field can both be approximately considered to be distributed according to a sinusoidal law. The spatial phase difference between them depends on the time phase difference between the no-load electromotive force E6 and the armature current I. The armature reaction magnetic field is also related to the load condition. When the generator load is inductive, the armature reaction magnetic field has a demagnetizing effect, causing the generator voltage to decrease; when the load is capacitive, the armature reaction magnetic field has a magnetizing effect, causing the generator output voltage to increase. Load operating characteristics: Mainly refer to external characteristics and adjustment characteristics. The external characteristic is the relationship between the generator terminal voltage U and the load current I when the speed is at the rated value, and the excitation current and load power factor are constant. The adjustment characteristic is the relationship between the excitation current If and the load current I when the speed and terminal voltage are at rated values, and the load power factor is constant.

icotek electrical component characteristics

The characteristics of an inductor are exactly opposite to those of a capacitor; it has the property of blocking AC while allowing DC to pass smoothly. The resistance when a DC signal passes through the coil is just the resistance of the wire itself, resulting in a very small voltage drop; when an AC signal passes through the coil, a self-induced electromotive force is generated at both ends of the coil. The direction of the self-induced electromotive force is opposite to that of the applied voltage, hindering the passage of AC. Therefore, the characteristic of an inductor is passing DC and blocking AC; the higher the frequency, the greater the coil impedance. Inductors often work together with capacitors in circuits to form LC filters, LC oscillators, etc. In addition, people use the characteristics of inductance to manufacture chokes, transformers, relays, etc. Passing DC: Refers to the inductor presenting a conductive state to DC. If the resistance of the inductor coil is ignored, DC can pass through the inductor "unimpeded." For DC, the coil's own resistance has very little hindering effect, so it is often ignored in circuit analysis. Blocking AC: When AC passes through the inductor coil, the inductor presents a hindering effect to the AC. What hinders the AC is the inductive reactance of the inductor coil.

icotek electrical component applications

SMD inductors are electromagnetic induction components made by winding insulated wires. They belong to commonly used inductive components. Function of SMD inductors: Passing DC and blocking AC is a simple description; they isolate AC signals, filter, or form resonant circuits with capacitors, resistors, etc. Tuning and frequency selection function of inductors: An inductor coil connected in parallel with a capacitor can form an LC tuning circuit. Any current in the circuit flowing through an SMD inductor generates a magnetic field, and the magnetic flux of this field acts on the circuit. When the current passing through the SMD inductor changes, the DC voltage potential generated in the SMD inductor will oppose the change in current. When the current passing through the inductor coil increases, the self-induced electromotive force generated by the inductor coil is opposite to the current direction, opposing the increase in current, while converting part of the electrical energy into magnetic energy stored in the inductor; when the current passing through the inductor coil decreases, the self-induced electromotive force is in the same direction as the current, opposing the decrease in current, while releasing stored energy to compensate for the decrease in current. Therefore, after inductive filtering, not only are the ripples of load current and voltage reduced and the waveform smoothed, but the conduction angle of the rectifier diode also increases. Inductor function 1: Color-ring inductors have a choking effect: The copper core in the color-ring inductor coil always opposes changes in the current in the coil. Color-ring inductors hinder the AC current used in the circuit; the magnitude of this hindrance is called inductive reactance XL, measured in Ohms. Its relationship with inductance L and AC frequency f is XL=2πfL. Color-ring inductors can be mainly divided into high-frequency choke coils and low-frequency choke coils. Inductor function 2: Color-ring inductors have tuning and frequency selection functions: A color-ring inductor connected in parallel with an electrolytic capacitor can form an LC tuning circuit. At resonance, the inductive reactance and capacitive reactance of the circuit are equal in magnitude but opposite in direction, meaning the natural oscillation frequency f0 of the circuit is equal to the frequency f of the non-AC signal, so the inductive reactance and capacitive reactance of the loop are also equal. The usage of color-ring inductors is generally not very high, and color-ring inductors used in circuits are generally quite stable. Inductor function 12: The main uses of color-ring inductors are signal screening, noise filtering, current stabilization, and suppression of electromagnetic wave interference. The basic function of color-ring inductors is charging and discharging, but many circuit phenomena derived from this basic charging and discharging function give color-ring inductors various different uses. Today, color-ring inductors are widely used by customers, and the role played by these small inductors should not be underestimated.

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