Analysis and Simulation of a Lorentz-Type Slotless, Self-Bearing Motor

Stephens, Lyndon Scott; Kim, Dae-Gon

doi:10.1016/s1474-6670(17)39185-1

IFAC Proceedings Volumes

2000

DOI: 10.1016/s1474-6670(17)39185-1

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Analysis and Simulation of a Lorentz-Type Slotless, Self-Bearing Motor

Lyndon Scott Stephens

Dae-Gon Kim

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Cited by 3 publications

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“…This idea was initially proposed by Okada et al (6) and it has led to several investigations on this type of self-bearing motor (7)(8)(9). This method exploited Lorentz relationship to produce both the levitating forces and motoring torque.…”

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confidence: 99%

Development of Lorentz Force‐Type Self‐bearing Motor for an Alternative Axial Flow Blood Pump Design

Lim

Zhang

2006

Artificial Organs

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A Lorentz force-type self-bearing motor was developed to provide delivery of both motoring torque and levitation force for an alternative axial flow blood pump design with an enclosed impeller. The axial flow pumps currently available introduce electromagnetic coupling from the motor's stator to the impeller by means of permanent magnets (PMs) embedded in the tips of the pump's blades. This design has distinct disadvantages, for example, pumping efficiency and electromagnetic coupling transmission are compromised by the constrained or poor geometry of the blades and limited pole width of the PMs, respectively. In this research, a Lorentz force-type self-bearing motor was developed. It is composed of (i) an eight-pole PM hollow-cylindrical rotor assembly supposedly to house and enclose the impeller of an axial flow blood pump, and (ii) a six-pole stator with two sets of copper wire and different winding configurations to provide the motoring torque and levitating force for the rotor assembly. MATLAB's xPC Target interface hardware was used as the rapid prototyping tool for the development of the controller for the self-bearing motor. Experimental results on a free/simply supported rotor assembly validated the design feasibility and control algorithm effectiveness in providing both the motoring torque and levitation force for the rotor. When levitated, a maximum orbital displacement of 0.3 mm corresponding to 1050 rpm of the rotor was measured by two eddy current probes placed in the orthogonal direction. This design has the advantage of eliminating the trade-off between motoring torques, levitating force, and pumping efficiency of previous studies. It also indicated the benefits of enclosed-impeller design as having good dynamic response, linearity, and better reliability. The nonmechanical contact feature between rotating and stationary parts will further reduce hemolysis and thromboembolitic tendencies in a typical blood pump application.

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mentioning

confidence: 99%

Development of Lorentz Force‐Type Self‐bearing Motor for an Alternative Axial Flow Blood Pump Design

Lim

Zhang

2006

Artificial Organs

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Dynamic Modeling and Validation of a Lorentz, Self-Bearing Motor Test Rig

Stephens

Kim

2002

Journal of Engineering for Gas Turbines and Power

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A new type of self-bearing motor that uses Lorentz-type forces to generate both bearing force and motoring torque has been developed. The motor stator is of slotless construction with four three-phase windings. The motor rotor is constructed of 16 surface mounted permanent magnets (PM’s). The main advantage of the design is that it eliminates the tradeoff between motoring torque and bearing force with PM thickness as found in previous designs. This paper presents the dynamic model for the self-bearing motor and illustrates how the model is integrated into the overall system model of the motor test rig. The dynamic model is validated against experimentally measured transfer functions with good agreement between the two.

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Robust Stability of the Lorentz-type Self Bearing Servomotor

Stephens

Chin

2003

JSME Int. J., Ser. C

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Analysis and Simulation of a Lorentz-Type Slotless, Self-Bearing Motor

Cited by 3 publications

References 3 publications

Development of Lorentz Force‐Type Self‐bearing Motor for an Alternative Axial Flow Blood Pump Design

Development of Lorentz Force‐Type Self‐bearing Motor for an Alternative Axial Flow Blood Pump Design

Dynamic Modeling and Validation of a Lorentz, Self-Bearing Motor Test Rig

Robust Stability of the Lorentz-type Self Bearing Servomotor

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