Method for controlling the position of a permanent magnetically supported rotating component

US7229474B2 · kind B2 · utility

Assignee

• Berlin Heart GmbH · DE

Inventors

• Jan Hoffmann · Rosbach, DE
• Andreas Arndt · Dalbke, DE
• Tobias Merkel · Kleinmachnow, DE

Key dates

• Filing date: Apr 29, 2002
• Grant date: Jun 12, 2007
• Expiry date: Feb 14, 2024

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02K5/128
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

Since disruptive forces can be continuously exerted upon a rotor during a pulsatile flow through a pump with a magnetically mounted rotor (permanent magnets and addition control current coils), it is necessary to adjust position i.e. modify axial rotor position very quickly. The control current should only result in small amounts of losses. According to the invention, the current is pulse-width modulated by the control current coils by means of a set value predetermined by a controller which is arranged downstream from a position sensing system. If the set value is high, it is switched to a higher voltage level and the real value of the position sensing system is stored for a defined period of time, respectively beginning with the switching flank of the control current, and the position sensing system is disconnected during said period of time.