Electromagnetic interference and safety are explained as they pertain to power electronics. This training is a complete overview and introduction to the Introduction to Power Electronics - Overview This overview discusses how energy sources are converted into electricity, and distributed in macro and micro settings. Introduction to Power Components This power electronics fundamentals presentation identifies the four major components needed in power converter design: inductors, capacitors, diodes.
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This current is referred to as inrush current or locked-rotor current. Some systems, when the power is switched on, briefly pull 50 times the normal operating current. Another problem is that the system may not even be able to start the motor because it cannot source or supply enough current.tradfabcisee.tk
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Most industrial businesses run during the day can be fined or charged extra Peak Demand charges during this peak usage time for large transients caused by large horsepower HP motor start ups. These Peak Demand charges can add up very quickly, especially if the motor needs to be started multiple times during any given day. The inrush current can be controlled one of two ways with a soft starter: either with a current limit discussed later or reduced linearly with the reduced voltage, and follows this approximation:.
Applications such as conveyors may not be able to handle a sudden jolt of torque from an across-the-line start.
Utilizing soft starters reduces the wear and tear on belts, conveyors, gears, chains, and gearboxes by reducing the torque from the motor. The torque decreases as a square of the reduced voltage, and follows this approximation:. Since soft starters are generally controlled and monitored by a microprocessor, a soft starter can add many features and protections fairly easily. It can offer a choice of the starting time, limited speed control, and energy savings. Power monitoring, such as three-phase current, three-phase voltage, power, power usage, power factor, and motor thermal capacity usage, can be implemented with current transformers, a voltage meter, and an internal clock.
Generally, a soft starter is constructed with three pairs of SCRs reverse parallel connected to allow the current to flow to or from the motor.