Driving device and driving motor system

The embodiment of the invention provides a driving device and a driving motor system. The driving device comprises direct-current buses and an inversion unit. The input end of the inversion unit is electrically connected with the output ends of the direct-current buses. The driving device further comprises a soft start unit and a discharge unit. The soft start unit is located on one of direct- current buses, the discharge unit is connected in series between the two direct-current buses, and the soft start unit and the discharge unit share a common element. According to the embodiment of the invention, at least two of the soft start unit, the discharge unit and a dynamic brake unit share a specified element, so that the cost of the driving device is effectively reduced, the size of the driving device is reduced, and the miniaturization of the driving device is facilitated.