Sensorless Control of a Stepper Motor Based on Higher Order Sliding Modes

Sensorless Control of a Stepper Motor Based on Higher Order Sliding Modes

High order sliding mode control of a sensorless induction motor

A new High Order Sliding Mode (HOSM) controller and an adaptive observer for sensorless induction motors (IM) drive are designed. The adaptive interconnected observer estimates the fluxes, the angular velocity, the load torque, and the stator resistance. The speedflux control law is an original HOSM one: a sliding manifold is designed in order to ensure finite-time convergence of sliding variab...

Higher Order Sliding Modes

One of the most important control problems is control under heavy uncertainty conditions. While there are a number of sophisticated methods like adaptation based on identi cation and observation, or absolute stability methods, the most obvious way to withstand the uncertainty is to keep some constraints by "brutal force". Indeed any strictly kept equality removes one "uncertainty dimension". Th...

Sensorless Position Control of Stepper Motor Using Extended Kalman Filter

This paper describes simple position control of sensorless hybrid stepper motor (HSM). A mathematical model for hybrid stepper motor is derived using mechanical and electrical equations, which is used to estimate the position of the motor using Extended Kalman Filter (EKF). In position control, estimated value is compared with the reference position and when both coincide, the motor is held at ...

Higher-order sliding modes, differentiation and output-feedback control

Being a motion on a discontinuity set of a dynamic system, sliding mode is used to keep accurately a given constraint and features theoretically-infinite-frequency switching. Standard sliding modes provide for finite-time convergence, precise keeping of the constraint and robustness with respect to internal and external disturbances. Yet the relative degree of the constraint has to be 1 and a d...