Define Air Gap Magnetics
Define Air Gap Magnetics
Define Air Gap Magnetics
Electric motor gaps are an integral component of their magnetic circuits, and any variations between their ideal state and reality often present issues in motor operation such as noise or vibration issues as well as increased core movement or faster insulation degradation rates.
Consider an air gap like this: when placed under a magnet, a plank of wood acts as a barrier that reduces its attraction, increasing magnetic circuit reluctance overall and lessening magnetism's ability to stick securely against it. Although magnets will still attract to it regardless, their strength won't be quite as great due to its lower permeability than iron bar and thus increasing overall magnetic reluctance of magnetic circuitry.
At its core, choosing an optimal gap size and type for your machine is of critical importance. A too large gap will require additional power to magnetize it while too small a gap could result in strength loss or efficiency loss for your machine.
This book is intended to assist with the design of gapped cores for brushless permanent magnet motor applications and contains an extensive range of lumped parameter circuit models that calculate back electromotive force waveforms, inductance values, cogging torque values, energized torque values as well as power losses due to eddy current. Furthermore, finite element analysis and equivalent models for gap discharge parameters based on physical similarities between long air gaps and lightning are derived - providing a valuable resource for anyone involved with high voltage engineering engineering! The book makes an invaluable resource.