Networked Control of Multiple Ultra-High-Speed PMSMs for AMEBA

This paper presents a speed synchronization control of a networked multiple ultra-high-speed PMSMs (UHS-PMSM) of 0.5M rpm rated speed for a mechanically based antenna (AMEBA). Multiple UHS-PMSMs with the same speed can establish a much stronger and more reliable communication in radio-frequency (RF) denied environments such as underwater or underground facilities. Thus, speed synchronization within a finite time limit is inevitable for AMEBA applications. The proposed control scheme consists of two segments, a supervisory controller (SC) and an individual motor drive (IMD) system. The SC is proposed for minimizing the speed difference between each motor as well as from the reference speed, using a sliding mode controller (SMC). In the IMD system, an extended state observer (ESO), with a new switching function, is used for canceling further disturbances occurring from speed synchronization error and other external disturbances. A double-power-based sliding mode controller is used to regulate the current in the IMD system, and a deadbeat model predictive (DMP) controller is used for the voltage regulator. The proposed synchronous control system is validated through simulation and experiments under different operating conditions to establish its effectiveness for AMEBA application.