Permanent magnet translational motor for respirators

摘要

A permanent magnet translational motor includes a double-ended cylindrical outer shell having a hollow interior, a solid cylindrical core in the hollow interior coaxially aligned with the longitudinal axis of the shell, and permanent magnet segments secured to the interior surface of the shell and surrounding the core. The permanent magnets develop a radial magnetic field across the air gap between the magnets and the core. A moving drive coil mounted on the core slides longitudinally back and forth in the magnetic field in response to changes in electric current passing through the coil. Opposed mounting brackets on the moving drive coil extend outwardly through longitudinally extending slotted openings in opposite sides of the shell for connection to a respirator piston. The drive coil is driven back and forth in response to an adjustable D.C. voltage waveform to control the pressure build up in the patient's lungs with respect to time during each inspiratory cycle of the respirator.