Smooth transition between speed and torque control in advanced drives for medium dynamic applications

This paper describes a control mode transition method between Speed Closed Loop control modes based on Voltage Vector Control (VVC-SCL) and torque control mode based on Torque Control with Speed Feedback (TCSF), which was proposed for applying in medium dynamic applications. In order to describe conveniently, the principle of VVC-SCL and TCSF are introduced in brief first. The relationship between VVC and TCSF core is analyzed later, subsequently, the reference and the control signals of two control modes are initialized and calculated in order to do bump-less transition. At last, the simulation and experiment results are given to show that the adopted method is feasible.