Five-axis magnetic suspension with two conical air gap bearingless PM synchronous half-motors

Munteanu, Gabriel; Binder, A.; Dewenter, Stefan

doi:10.1109/speedam.2012.6264414

Cited by 45 publications

(13 citation statements)

References 5 publications

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“…From (12) it can be seen that the lateral force in one distinct direction consists of four components whereof two are constant. The force coefficients can be calculated according to (13). Equation (13) is valid for m = 3 phases.…”

Section: Force Ripplementioning

confidence: 99%

“…Among these, there are BMs which do not need an axial position control due to a disk-like and thereby self-stabilizing rotor [8][9][10][11][12]. Other topologies can actively generate axial rotor force by a conical rotor [13,14] or a chessboard structure on the rotor surface [15]. However, the complexity in terms of manufacturing effort and control disable these interesting solutions from industrial use.…”

Section: Introductionmentioning

confidence: 99%

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Bearingless PM synchronous machine with zero-sequence current driven star point-connected active magnetic thrust bearing

Dietz

Binder

2018

Transportation Systems and Technology

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Common cylindrical bearingless drives require a separate thrust bearing, which is fed by a DC supply. Here, a technique is presented, which enables the feeding of the thrust bearing by an artificially generated zero-sequence current between the two star points of the two parallel windings in the bearingless PM synchronous machine. This way, no additional DC supply for an axial active magnetic bearing is needed. It is replaced by two three-phase inverters as stator winding supply, which are needed in any case to generate torque and lateral rotor force in the motor. This examination explains the technique of adapting the electric potential of the star points in two three-phase windings of the motor. The focus is on the determination of the operating area (maximum zero-sequence current and band width). It is constrained by the bearingless motor due to torque and lateral force ripple as well as additional eddy current losses. On the other hand, the DC link voltage and the modulation degree of the inverter for simultaneous motor operation as well as the bearing inductance limit the system dynamic. It is shown that the proposed technique is applicable for a modulation degree < 0.866, taking into account that other constraints by the bearingless machine and the inverter are mainly noncritical.

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Section: Force Ripplementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bearingless PM synchronous machine with zero-sequence current driven star point-connected active magnetic thrust bearing

Dietz

Binder

2018

Transportation Systems and Technology

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“…As in cylindrical electrical machines, three different kinds of forces act on the rotor: lateral or radial, tangential and axial force. Particularly, with respect to the lateral surface, the total force can be divided into tangential and normal components [5], [6].…”

Section: A Forces Acting On Conical Motormentioning

confidence: 99%

Axial position estimation of conical shaped motor for green taxiing application

Roggia

Galea

Gerada

et al. 2016

2016 IEEE Energy Conversion Congress and Exposition (ECCE)

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Abstract-This paper considers the possibility of adopting a conical shaped motor for Green Taxiing (GT) application. This topology of motor has been selected in order to obviate the presence of external declutching system (i.e. mechanical or electromagnetic clutch) interposed between the electric actuator and the wheel. An axial force contributes to move the rotor inside-out of the stator (principle of sliding-rotor). The axial movement of the rotor can be monitored acting on the magnetizing current. The axial sensor-less position estimation method described hereafter envisages the possibility of evaluating the axial position of the rotor during the engaging and disengaging movement from the wheel. The axial position calculation is dependent on the inductance of the motor. An "online" computation of the position has been implemented through the use of high-frequency injection signals.

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“…The magnetic force, resulting from the interaction between the rotating and steady part of the motor, is perpendicular to the rotor surface and contains an axial contribution responsible for the horizontal movement of the rotor [19]. The axial component of the force, in fact, causes a translational movement of the rotor that occurs conjointly with the rotational one.…”

Section: Introductionmentioning

confidence: 99%

Axial Position Estimation of Conical Shaped Motors for Aerospace Traction Applications

Roggia

Cupertino

Gerada

et al. 2017

IEEE Trans. on Ind. Applicat.

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-This paper is concerned with the use of conical induction machines. Such machines are extremely valuable when apart from the rotational torque output, an axial translation of the rotor is also required. The inherent attraction between the stator and rotor of any machine, combined with the geometry of a conical machine will provide the required axial movement. However, when applied to aerospace applications, where reliability is very important, then full monitoring of the axial position is required. In this paper, an innovative approach aimed at monitoring and controlling the axial translation of a conical induction machine is proposed and investigated. In order to increase the system reliability and also decrease component count, as demanded by the application, the methodology is a sensor-less technique, based on an innovative variant of the highfrequency injection approach. In this paper, the technique has been fully investigated and experimentally validated on a purposely-built, instrumented test-rig.Index Terms--conical motor; sliding rotor; high voltage signal injection; in-wheel actuator.

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Five-axis magnetic suspension with two conical air gap bearingless PM synchronous half-motors

Cited by 45 publications

References 5 publications

Bearingless PM synchronous machine with zero-sequence current driven star point-connected active magnetic thrust bearing

Bearingless PM synchronous machine with zero-sequence current driven star point-connected active magnetic thrust bearing

Axial position estimation of conical shaped motor for green taxiing application

Axial Position Estimation of Conical Shaped Motors for Aerospace Traction Applications

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