Driving an AMB system using a 2D space vector modulation of three-leg voltage source converters

Abstract

This paper presents new methodologies for driving an active magnetic bearing (AMB) system using a two-dimensional (2D) space vector modulation of three-leg voltage source converters. Two types of driving configurations are proposed: full-performance and economy. The economy configuration is proven to be more cost-effective than the conventional driving configurations. For both driving configurations, conversion rules are developed to calculate the three-leg voltage references from two-coil voltage references of an AMB system. In addition, the potential performance limit of the proposed driving configurations is analyzed. Experimental results are presented using a single degree of freedom (DOF) AMB system to verify the analytical results.

Power Amplifiers and Their Feedback Mechanisms for AMB—A Comprehensive Review

“…Consequently, the conversion of a 3-phase servo amplifier into a magnetic bearing controller is readily achievable by a straightforward software replacement and then the problem of cross coupling and non-linearity was addressed in this work. Dynamic performance limitations of space vector PWM were researched by [25]. The reference voltage is usually calculated by PID controller [26].…”

“…To address these issues, the remodified approach adopts a closed-loop PI controller with unipolar PWM and a LC filter in output, which reduces THD in the output, increasing stability, and minimizing mechanical vibrations. A 3-phase inverter for 3 stage winding supply to coils of AMB was suggested in [40] [41]. The Spanish scholars used 3-phase matrix convertor to drive the 3-phase stator windings or electromagnets [42].…”

“…Here, a carrier signal is modulated by a reference triangular signal, resulting in the generation of pulses [62] [63]. Three level space vector PWM modulation techniques were also used in IGBT based SPA of Radial AMB [64]. The drive circuit is of utmost importance within the SPA system, with a special emphasis on the PWM modulator.…”

“…So, the 3-phase-half-bridge or neutralized-sharing-bridge topology current response rate is only half of that of the half-bridge topology SPA. The capacitive half bridge type has the drawback of requiring careful maintenance of the voltage balance between the two capacitors in the circuit[64]. The cost of neutralized and 3-phase Half bridge is lesser than half bridge type SPA.…”

Space Vector Modulation Strategies for Self-Sensing Three-Phase Radial Active Magnetic Bearings

“…The coils of the poles U + , V + , W + and the opposite coils are connected in wye-configuration. For achieving low system costs, a conventional three-phase inverter is aspired for the control of the AMB [13,14]. Two opposite coils are corresponding to one phase, which enables the use of a three-phase inverter.…”