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This paper presents a new design concept for cascade control of brushless direct current (BLDC) motor drive. Cascade controllers are designed for definite separation of loops. This separation allows independent design of controllers with minimum interaction among loops. The resultant structure with inner loop and outer loop is a robust structure. Magnitude Optimum Multiple Integration (MOMI) tuning method is proposed to design the PID controllers used in inner and outer loops. This method provides a fast and non-oscillatory closedloop response for motor drives. The aim of the proposed method is to determine optimal Proportional-Integral-Derivative gains of the controller so as to force the rotor to follow the reference speed without any oscillations with zero steady-state error. MOMI method proceeds by determining the open-loop process gain to calculate the moments (areas), from which controller parameters can be calculated. The MATLAB/SIMULINK is used for simulation of the drive system. Several simulation tests performed to investigate the robustness of the controller and is justified by the simulation of BLDC drive under setpoint changes, input disturbance and load disturbances.

Cascade control of BLDC motor drive using MOMI tuning method