BLDC Motor for a centrifugal blood pump Religa Heart ROT

Religa Heart ROT is a centrifugal blood pump driven by permanent magnet BLDC motor. The construction of the centrifugal pump provide cardiac support with minimal risk of blood clotting during several years of working.

BLDC Motor for a centrifugal blood pump Religa Heart ROT

Religa Heart ROT is a centrifugal blood pump driven by three-phase permanent magnet brushless DC motor. MESco was responsible for design process of BLDC Motor with levitating rotor. Designed PM BLDC motor basing on a state of the art technology and it is distinguish by high reliability, compact size and high efficiency.

BLDC Motor for a centrifugal blood pump Religa Heart ROT
Prototype of Religa Heart ROT (source: www.pwpss.pl)

Religa Heart ROT is the first centrifugal pump in Europe which reached into the phase of preclinical studies on animals.  Construction of the pump provide cardiac support with minimal risk of blood clotting during several years of working. The aim of project was the possibility of long-term (permanent) cardiac support  for patients with cardiac disease. The prototype of blood pump was submitted to perform tests needed to implementation process. In order to ensure an adequate level of reliability of whole system the drive of heart pump consist of two identical BLDC motors place coaxially – each of motor have an independent source.

BLDC Motor for a centrifugal blood pump Religa Heart ROT
Analyzed motor construction: with air core (a), with disc on rotor and stator (b), with SMC stator (c)

At the begging engineers made a couple of assumptions, i.e.: obtain highest power in order to maximum dimensions of pump, reduction of torque ripple, decrease losses for continuous working and reduce the vibration of motor. [image5] During design process engineers take into account three type of motor construction: with air core, disc and third one with SMC (Soft Magnetic Composites) material.

BLDC Motor for a centrifugal blood pump Religa Heart ROT
Stator (a) and rotor (b) of BLDC Motor

After a complex analysis of three different construction of motors engineers choose motor with SMC core which fits into the design assumptions and gave the highest performance. SMC material able us to make a complex shape of rotor as a one part with reduction of eddy-current losses improving overall performance of motor.

BLDC Motor for a centrifugal blood pump Religa Heart ROT
An example of the distribution of the magnetic induction B [T] in magnets.

The results obtained during simulations in ANSYS Maxwell and Simplorer corresponds with measurements of BLDC motor performed on a test stand. Assuming Religa Heart ROT is a miniature centrifugal pump which is implantable directly into the left ventricular - such a surgery allows to allocate pump in pericardial cavity near to the heart and pumping blood from the left ventricle into the aorta by rotating miniature rotor. Rotor is suspend in a static magnetic field and rotates from 2500 up to 5500 rpm. Project of centrifugal pump was realized by  Foundation of Cardiac Surgery Development in Zabrze (www.frk.pl) in cooperation with MESco.


MESco

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1994