Slotless motor for implantable axial flow blood pump

Abstract

The invention discloses a slotless motor for an implantable axial flow blood pump. The slotless motor comprises a stator iron core, a stator winding, a rotor rotating shaft and a rotor permanent magnet. The slotless motor is characterized in that the stator iron core is formed by axially punching a circular silicon steel sheet, the rotor permanent magnet is made of a permanent magnetic material and is supportive of radial magnetizing, a coil of the stator winding is positioned between the stator iron core and the rotor rotating shaft, the stator winding is pasted on the inner wall of the stator iron core which is cylindrical, and the stator iron core is of a tooth-slotless structure. A direct-current brushless slotless structure is adopted, so that tooth-slot torque is eliminated, and copper loss is lowered. A triphase winding is divided into two layers of structures, copper wires at the end are arranged regularly, and thickness is consistent with that of a central portion, so that radial thickness of the end of the motor is reduced. High-heat-conductivity epoxy resin is used to fix the stator winding, so that the problem that the coil generates heat is solved effectively, the motor winding is fixed, and electromagnetic vibration and noise are avoided.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to a slotless motor for an implanted axial flow blood pump. Background technique [0002] At present, the axial flow blood pump is a mechanical pump device that partially or completely replaces the blood pumping function of the heart, and has broad clinical application prospects. As an important part of the artificial heart pump, the drive motor directly determines the performance of the axial blood pump. Compared with traditional motors, axial flow blood pump drive motors are required to reduce volume, reduce noise, and improve operating performance on the basis of meeting high reliability and high stability. The permanent magnet brushless DC motor has a series of advantages such as high power density, small geometric size, fast dynamic response, and high operating efficiency. It has broad application prospects in high-speed operating occasions and has been widely used...

AI Technical Summary

Problems solved by technology

[0004] The winding ends of the existing traditional brushless DC motor coils are placed outside the edge of the stator, the arrangement is irregular, the thickness is high, and the space occupied is relatively large. At the same time, the winding ends cannot be effectively used, which increases the magnetic flux leakage and copper loss of the motor. , which reduces the rotational torque of the motor; the stator of the traditional motor has a cogged structure, and the torque ripple is large

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