Static drives – Main types

A static drive is a power converter that has the function of modulating the electrical energy supplied to the motor. The types of drives most commonly used are as follows:

– Frequency Inverter: It provides, from a fixed frequency alternating current network, an alternating voltage of effective value and variable frequency (according to alei U / f = constant). The power circuit is made by a rectifier and an inverter and the regulation is done in the same way as with the controlled rectifier. The output voltage of the inverter can not exceed the power, the torque described in the inverse proportion of the speed running at constant power P = Cw. This type of inverter is applied by asynchronous cage motors, in addition, the frequency inverter has great cost-benefit, as they ensure electrical energy savings, longer durability of gears, pulleys and other mechanical components.

– Direct current converter: It provides direct current, from a single-phase or three-phase alternating current network, controlling the average value of the voltage. We can vary this voltage by changing the conduction angle of the power semiconductors. This type of converter powers direct current motors, in most cases with independent excitation.

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