| 摘要 |
FIELD: electricity.SUBSTANCE: invention relates to power conversion equipment. Frequency electric drive comprises input terminals A, B, C for connection of supply three-phase network, switching elements and induction motor rotor surrounded by stator, comprising three-phase windings. Three-phase windings are made with possibility of providing together with appropriate switching elements of modulation parameters of three-phase AC power supply circuit. In an embodiment, stator has three equally formed parts which are arranged in series along a short-circuited rotor. Each part of stator comprises two three-phase windings. In each part of initial phase terminals of three-phase windings of one coil and other ends of phase windings of three-phase windings connected to respective input terminals A, B and C, and each of other terminals of three-phase windings connected to respective three-phase windings of switching element. In an embodiment, switch element is designed as a three-phase diode bridge with an electronic switch in DC circuit. Phase windings of three-phase windings of one part of stator are connected in series to input terminals A, B, C, and phase windings of three-phase windings of other parts of stator are connected in series to input terminals B, C, A and C, A, B.EFFECT: high efficiency of frequency conversion, broader functional capabilities, field of use and reduction of weight and dimensions of frequency drive.6 cl, 5 dwg |
