Rotor flux oriented control on the rotor side of the induction motor
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2013, Vol 37, Issue 37
Abstract
In heavy duty drives, in the range of hundreds kW, wound rotor induction motors are widely used. It is the case of cement and minerals industries. Major users make use of tens of such drives, summing hundreds of MW. Due to the large amount of losses which occur at low speeds, the users use the facility given by the wound rotor only for starting, despite the technical capabilities to easily operate at variable speed. Even so, given the range of power, the losses specific to the additional rotor resistors are quite important. As will be shown, these additional looses can arrive to one fifth of the active energy consumed during only the starting process. The paper briefly discusses the existing technologies involved in the variable speed drives based on wound rotor induction machines and proposes a technique for starting which avoids the use of additional rotor resistors and consequently it eliminates the corresponding losses. The technique implies the control on the rotor side of the motor, the stator being directly connected to the grid. This is an important aspect, as generally, in certain applications, the stator rated voltage is quite high (typical 6 kV). The simulations confirm the viability of the technique.
Authors and Affiliations
Sergiu Ivanov, Virginia Ivanov
Keywords
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