Three-phase four-limb conjugated electric reactor

The invention discloses a three-phase four-limb conjugated electric reactor. The three-phase four-limb conjugated electric reactor comprises an upper yoke, six core limbs wound with coils, a middle yoke, a lower yoke and a coil-free side limb. Three of the core limbs wound with the coils are arranged between the upper yoke and the middle yoke side by side, and other three core limbs wound with the coils are arranged between the middle yoke and the lower yoke side by side. The coil-free side limb is a side yoke and is arranged on the outermost side of the core limbs wound with the coils. Two ends of the coil-free side limb are connected with the upper yoke and the lower yoke respectively, and the middle of the side limb is connected with the middle yoke. The side limb added to a conventional three-phase electric reactor can provide a magnetic loop for the core limbs wound with the coils, and a high restraining effect to common-mode signals is achieved; compared with two independent electric reactors, the electric reactor of an up-down conjugated structure has the advantages that one yoke is omitted and the common yokes can be downsized.