The utility model discloses a frequency converter. The frequency converter comprises a housing, a mounting rack, a heat
radiation assembly and a
frequency conversion main body. The mounting frame is arranged in the shell, an air duct is formed in the mounting frame, and the mounting frame is provided with a plurality of adjacent mounting positions in the air duct in the circumferential direction of the shell; the heat dissipation
assembly is arranged in the air duct; the
frequency conversion main body is arranged in the air duct and located on one side, in the height direction of the shell, of the heat dissipation
assembly, the
frequency conversion main body comprises a rectification assembly, an inversion assembly and a control assembly, and the rectification assembly, the inversion assembly and the control assembly are arranged in the installation positions respectively. When the frequency converter provided by the utility model is installed, the heat dissipation assembly with a large volume is arranged in the
air channel, and then the rectification assembly, the inversion assembly and the control assembly are respectively arranged in one installation position, so that the structure of the frequency conversion main body is more compact, and the volume of the frequency converter is effectively reduced; and the rectification assembly, the inversion assembly and the control assembly are in
modular design, so that the device is convenient to install and disassemble during maintenance, and the maintenance time is reduced.