A Novel Driving Scheme for Three-Phase Bearingless Induction Machine with Split Winding

Abstract

In order to reduce the costs of implementing the radial position control system of a three-phase bearingless machine with split winding, this article proposes a driving method that uses only two phases of the system instead of the three-phase traditional one. It reduces from six to four the number of inverter legs, drivers, sensors, and current controllers necessary to drive and control the system. To justify the proposal, this new power and control configuration was applied to a 250 W machine controlled by a digital signal processor (DSP). The results obtained demonstrated that it is possible to carry out the radial position control through two phases, without loss of performance in relation to the conventional three-phase drive and control system.

Application of Active Disturbance Rejection in a Bearingless Machine with Split Winding

“…Noting the strong nonlinear and parameter-varying characteristics of induction motor bearings, he analyzed the contribution of Fuzzy controllers on transient and permanent regime performance. In order to reduce the number of equipment needed for machine control in [10] optimized the structure of the motor bearing by proposing a new way to connect the coils in the machine stator. In [10] investigated the spatial distribution of the machine's coils and realized that it was possible to generate the radial position control components using only two phases.…”

“…In order to reduce the number of equipment needed for machine control in [10] optimized the structure of the motor bearing by proposing a new way to connect the coils in the machine stator. In [10] investigated the spatial distribution of the machine's coils and realized that it was possible to generate the radial position control components using only two phases. In this topology, the coils of one of the machine phases are connected directly to the center point of the inverter's DC bus.…”

“…Figure 1 shows the position of the windings relative to the X and Y axes. In the optimization proposal by [10] the coil connection arrangement was modified to the structure shown in Figure 2. This modification reduced the number of control and drive components for the currents in each phase.…”

“…Since I b + I c = −I a , it can be seen that for the modification performed by [10], the characteristics of the coil currents of phase A have been preserved.…”

Radial Magnetic Bearings for Rotor–Shaft Support in Electric Jet Engine

“…The latest papers have shown new control methods of bearingless induction motors [21,22], as well as the design and analyses of synchronous reluctance motors [23]. This paper will explain the concept of magnetic bearing systems for jet engines in detail.…”