Servo driver with bus cascade structure

The utility model relates to the field of motor servo systems, in particular to a servo driver with a bus cascade structure, which comprises a case, and a rectifier module, a controller, a brake module and a plurality of drivers which are arranged in a working cavity of the case, and is characterized in that the controller is connected with the plurality of drivers through a circuit board; one end of the circuit board is connected with the controller through a control line, the other end of the circuit board is connected with the drivers one by one through a plurality of flat cables, the brake module is arranged on the circuit board, and the rectifier module is connected with the controller through a first connecting line and connected with the drivers through a plurality of second connecting lines. And a cooling fan for cooling the working cavity is arranged on the rear side of the case. A plurality of drivers are matched with one rectifier module, one controller and one brake module, so that the arrangement