Electromagnetic acceleration of permanent magnets

TL;DR

This paper explores the electromagnetic acceleration of neodymium iron boron permanent magnets using magnetic field gradients, analyzing the maximum achievable velocity and acceleration length based on magnetic properties.

Contribution

It introduces a method for accelerating permanent magnets with electromagnetic fields and quantifies the maximum gradient and velocity limits based on material properties.

Findings

Maximum magnetic field gradient is 20 kG/cm for these magnets.

Achievable velocity is approximately 6 km/s.

Acceleration length is about 637 meters.

Abstract

We consider the acceleration of the permanent magnets, consisting of neodymium iron boron by means of the running magnetic field gradient. It is shown that the specific magnetic moment per nucleon in neodymium iron boron is determined by the remained magnetization of the substance. The maximum accessable gradient of the magnetic field accelerating the permanent magnets is determined by the coercive force thirty kilogauss. For the neodymium iron boron magnets this gradient is equal to twenty kilogauss divided by one centimeter. The finite velocity of the magnets six kilometers per second, the length of acceleration is six hundred thirty-seven meters.