amica electrical components Germany amica model amica price

amica electrical components are components that can convert electrical energy into magnetic energy and store it. The structure of an inductor is similar to that of a transformer, but it has only one winding. An inductor has a certain inductance and only impedes changes in current. If the inductor is in a state with no current flowing through it, it will attempt to impede current flow when the circuit is closed; if the inductor is in a state with current flowing through it, it will attempt to maintain the current unchanged when the circuit is opened. Inductors are also known as chokes, reactors, and dynamic reactors.

amica electrical components composition

A sensor generally consists of four parts: a sensing element, a conversion element, a signal conditioning circuit, and an auxiliary power supply. The sensing element directly senses the measured quantity and outputs a physical quantity signal that has a definite relationship with the measured quantity; the conversion element converts the physical quantity signal output by the sensing element into an electrical signal; the signal conditioning circuit is responsible for amplifying and modulating the electrical signal output by the conversion element; the conversion element and the signal conditioning circuit generally require an auxiliary power supply.

amica electrical component types

For different application scenarios, the purpose of applying varistors varies, and the voltage/current applied to the varistor should not be the same. Therefore, the requirements for varistors also differ. It is very important to distinguish these differences for correct usage. Based on the intended use, varistors can be divided into two main categories: ① protection varistors, ② circuit function varistors. Protection resistors: (1) Distinguish whether it is a power supply protection varistor or a signal line/data line protection varistor, as they must meet different technical standards. (2) Depending on the continuous operating voltage applied to the varistor, varistors used across power lines can be classified into AC type or DC type. The aging characteristics of varistors under these two types of voltage stress are different. (3) According to the abnormal overvoltage characteristics that the varistor can withstand, varistors can be categorized into three types: surge suppression type, high-power type, and high-energy type. 1. Surge suppression type varistors refer to those used to suppress transient overvoltages such as lightning-induced overvoltage and switching overvoltage. These transient overvoltages occur randomly and non-periodically, with potentially large peak current and voltage values. Most varistors fall into this category. 2. High-power type varistors refer to those used to absorb periodic pulse groups, such as varistors connected in parallel with switch-mode power converters. Here, the impact voltage occurs periodically, and the period is known. Although the energy value can generally be calculated and the peak voltage is not significant, due to the high frequency of occurrence, the average power is quite substantial. 3. High-energy type varistors refer to those used to absorb magnetic energy from large inductive coils, such as generator excitation coils and lifting electromagnet coils. For such applications, the primary technical indicator is the energy absorption capability. In most cases, the protective function of varistors can act repeatedly; however, sometimes they are designed as "one-time" protective devices similar to current fuses. For example, varistors with short-circuit contacts connected in parallel to certain current transformer loads.

amica electrical component characteristics

Operating characteristics: The main characteristics characterizing the performance of a synchronous generator are the no-load characteristics and the load operating characteristics. These characteristics are an important basis for users to select generators. No-load characteristics: 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 rotational 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 E9 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 plays a demagnetizing role, which will cause the generator voltage to decrease; when the load is capacitive, the armature reaction magnetic field plays a magnetizing aid role, which will cause 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 constants. 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.

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