Speed-sensorless control of switched-reluctance motors with uncertain payload

Abstract

Abstract-We present a controller for switched-reluctance motors without velocity measurements and provide, to the best of our knowledge, the first result establishing global exponential stability. Our controller is composed of an "internal" tracking control loop for the stator dynamics and an "external" control loop based on the so-called PI 2 D controller. The latter consists in a linear proportional derivative controller in which the measurement of velocities is replaced by approximate derivatives. Furthermore, a double integrator is added to compensate for the load uncertainty. We illustrate our theoretical findings with numerical simulations.

Exponential Stabilization of Switched-Reluctance Motors Via Speed-Sensorless Feedback

“…Other works on sensorless control and containing a theoretical analysis concern different electrical machines such as the induction motor -see e.g., [11]. This paper is the outgrowth of [12], we exploit the physical characteristics of the nonlinear model of the switchedreluctance machine. The control design relies on the ability to separate the machine model into its electrical and mechanical components.…”

Velocity Regulation in Switched Reluctance Motors under Magnetic Flux Saturation Conditions

“…Moreover, a zero load torque due to friction is considered by [14]. On the other hand, although a nonzero constant (for all time) load torque is reported in simulations presented by [12], performance during the transient response cannot be evaluated from such a test.…”

“…An important difference of our approach with respect to that of other authors [10,[12][13][14][15] is that, aside from term ( , ) * , we do not require to complete by feedback of an error equation for the electrical subsystem of motor. This allows us to avoid necessity of feedback of complex functions of the state such aṡ * which we only have to dominate.…”

“…Now let us obtain the closed loop dynamics of system described in Proposition 1. Replacing (12) in (2) and adding and subtracting some convenient terms, we have…”

“…Some recent theoretical works on SRM control [10,[12][13][14][15] assume that only proportional electric current controllers are employed. However, the resulting control laws are very complex because their stability proofs require feedback of many nonlinear terms in order to complete the error equation for electric current.…”