Low-cost compact permanent magnet machine for adjustable-speed pump application

This article describes a design process for a new pediatric ventricular assist device, the PediaFlow. The pump is embodied in a magnetically levitated turbodynamic design that was developed explicitly based on the requirements for chronic support of infants and small children. The procedure entailed the consideration of multiple pump topologies, from which an axial mixed-flow configuration was chosen for further development. The magnetic design includes permanent-magnet (PM) passive bearings for radial support of the rotor, an actively controlled thrust actuator for axial support, and a brushless direct current (DC) motor for rotation. These components are closely coupled both geometrically and magnetically, and were therefore optimized in parallel, using electromagnetic, rotordynamic models and fluid models, and in consideration of hydrodynamic requirements. Multiple design objectives were considered, including efficiency, size, and margin between critical speeds to operating speed. The former depends upon the radial and yaw stiffnesses of the PM bearings. Analytical expressions for the stiffnesses were derived and verified through finite element analysis (FEA). A toroidally wound motor was designed for high efficiency and minimal additional negative radial stiffness. The design process relies heavily on optimization at the component level and system level. The results of this preliminary design optimization yielded a pump design with an overall stability margin of 15%, based on a pressure rise of 100 mm Hg at 0.5 lpm running at 16,000 rpm.

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“…10 for the rotational motion because of compactness, high efficiency, and ability to operate across a large magnetic gap (11,12).…”

Section: Motormentioning

confidence: 99%

Magnetic Design for the PediaFlow Ventricular Assist Device

et al. 2007

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“…In fact, PM machines have no rotor losses, and for a given output torque the I 2 R loss is significantly lower if compared with that one of machine topologies which use ac excitation (i.e. either the induction or reluctance machine topology) [8][9][10]. In the PM machines power losses are only found in the machine stator and this allows easy removal of heating by means of a suitable arrangement of heat dispersal paths.…”

Section: Wheel Motor Prototypementioning

confidence: 99%

Low-voltage Fed Encoderless Motor Drive Devoted To Wheelchairs For A Sustainable Mobility

Lidozzi¹,

Serrao²,

Solero³

et al. 2007

Eletrônica de Potência

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This paper reports the results achieved through the development of a prototype of electric wheelchair having direct-drive motors being housed within the wheel rims and designed to achieve performance as required for such a particular 24 V battery-operated vehicle application. The main levels of innovation of the realized prototype are described: the design and construction of two twin AFPM wheel-motor drives; the design and modeling of controllers together with the regulators tuning; the design and realization of the power conversion section; the development of a back-EMF-based method in conjunction with Hall-effect sensors to estimate rotor speed and position. Then, EMC characterization of the electric wheelchair is presented.

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“…It is suitable for some applications of high-performance requirement, for example, robotics, aerospace, electric ship propulsion systems, and wind power generation systems [1][2][3]. PMSM can provide significant performance improvement in many variable speed applications [4].…”

Section: Introductionmentioning

confidence: 99%

Multiobjective Optimization of PID Controller of PMSM

Zhang

et al. 2014

Journal of Control Science and Engineering

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PID controller is used in most of the current-speed closed-loop control of permanent magnet synchronous motors (PMSM) servo system. However,Kp,Ki, andKdof PID are difficult to tune due to the multiple objectives. In order to obtain the optimal PID parameters, we adopt a NSGA-II to optimize the PID parameters in this paper. According to the practical requirement, several objective functions are defined. NSGA-II can search the optimal parameters according to the objective functions with better robustness. This approach provides a more theoretical basis for the optimization of PID parameters than the aggregation function method. The simulation results indicate that the system is valid, and the NSGA-II can obtain the Pareto front of PID parameters.

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Low-cost compact permanent magnet machine for adjustable-speed pump application

Cited by 42 publications

References 6 publications

Magnetic Design for the PediaFlow Ventricular Assist Device

Magnetic Design for the PediaFlow Ventricular Assist Device

Low-voltage Fed Encoderless Motor Drive Devoted To Wheelchairs For A Sustainable Mobility

Multiobjective Optimization of PID Controller of PMSM

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