Low-frequency direct-drive high-voltage frequency converter of elevator

The invention belongs to a special high-voltage frequency converter technology and provides a low-frequency direct-drive high-voltage frequency converter of an elevator. The low-frequency direct-drivehigh-voltage frequency converter of the elevator comprises a rectifier transformer, a low-frequency power unit, a main control system and a high-precision encoder. The rated capacity S0 of the rectifier transformer is selected at least according to 1.6 times of the rated power Pe of a lifting motor, namely S0 is greater than or equal to 1.6 Pe; the rectifier transformer is provided with a group of primary windings and 3*j groups of secondary windings; the primary winding is connected with a high-voltage switch cabinet for supplying power; and the rated capacity S1 of each group of secondary windings is equal to S0/(3*j), and the secondary windings are connected with three-phase input ends R, S and T of the low-frequency power unit through power cables in a one-to-one correspondence mannersuch that the total volum