Investigation of the methods of starting and braking in the “Frequency converter asynchronous motor” system

Abstract

Various start-up methods depending on the power of the asynchronous motors, the nature of the load: direct, autotransformer startup, star-to-Triangle sharpening of the spark plugs, launches using reactor, thyristor modifiers are taxied. The start-up current generates oscillation in the supply network, lowering the electrical energy quality, which negatively affects the electrical consumers being supplied from that network, especially at launch moment sensing values, frequent start-ups and reverses. The asynchronous motor with a short-circuited rotor has proven itself well as a driving link of various mechanisms due to its simple design, high reliability, and ease of maintenance. One of the disadvantages of BP is the high consumption of reactive power, especially at the moments of reducing the mechanical load on the shaft, which is typical for many actuators under the conditions of the technological process.