Key result
Closed-form magnetic suspension equations enable accurate modeling and compact, stable design of the HeartQuest LVAD.
Motivated by the design of the HeartQuest magnetically levitated left ventricular assist device, closed form expressions have been developed to compute forces and stiffnesses of magnetic suspensions. The theory applies to any combination of concentric permanent magnet rings, and its accuracy and versatility were verified by experiments. The equations adapt to spreadsheet implementation and numerical optimization, providing a powerful tool of optimal design of magnetically levitated ventricular assist devices (VADs). The method was applied to the development of the HeartQuest VAD which achieved remarkable compactness and stable operation.
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Chen et al. (2002) studied Heart failure requiring left ventricular assist device. HeartQuest magnetically levitated left ventricular assist device was evaluated on Forces and stiffnesses of magnetic suspensions, device compactness, and operational stability. Closed-form magnetic suspension equations accurately modeled concentric permanent magnet rings and enabled compact, stable design of the HeartQuest left ventricular assist device.
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