Real-Time Electromagnetic Estimation for Reluctance Actuators

Abstract

Several modeling, estimation, and control strategies have been recently presented for simple reluctance devices like solenoid valves and electromagnetic switches. In this paper, we present a new algorithm to online estimate the flux linkage and the electrical timevariant parameters of these devices, namely the resistance and the inductance, only by making use of discrete-time measurements of voltage and current. The algorithm, which is robust against measurement noise, is able to deal with temperature variations of the device and provides accurate estimations during the motion of the armature. Additionally, an integral estimator that uses the start of each operation of the actuator as reset condition has been also implemented for comparative purposes. The performances of both estimation methods are studied and compared by means of simulations and experimental tests, and the benefits of our proposal are emphasized. Possible uses of the estimates and further modeling developments are also described and discussed.

An efficient dynamical model of reluctance actuators with flux fringing and magnetic hysteresis

“…Specifically, we propose to replace φ with the flux linkage λ = N φ, and H c with the auxiliary variable M * c = M c l c /N. Then, the dynamic equation of λ is derived from ( 16) or (17), depending on the input choice,…”

“…The electromagnetic variables are λ and M * c . While M * c is a hidden variable, λ can be assumed known because it can be directly estimated from the electrical signals, as explained in [5] and [17].…”

Hybrid Dynamical Model for Reluctance Actuators Including Saturation, Hysteresis, and Eddy Currents

“…At the same time, the oscilloscope measures, registers, and sends the values of voltage, v, and current, i, back to the computer. Finally, the data are processed and the magnetic flux, φ, is estimated as described in [39]. Three different sets of experiments have been performed, each having a specific purpose and based on a particular type of waveform which is repeated at several levels of excitation.…”

Multiple-Output ZVS Resonant Inverter Architecture for Flexible Induction Heating Appliances

“…This approach is the most common nowadays in the market and typically uses an electromechanic relay network to configure the inverter output according to the user requirement. While being a costeffective solution, this approach has severe limitations due to the use of relays such as the noise [13], [14] or limited switching times, and usually requires of complex IH load identification systems [15]- [17] to ensure proper converter operation.…”