چۆن دەستەی ناوەند و دەستەی هێستەریس بەرەبەر دەبن
Pêşkêşkirina Gazrê û Gazra Hysterêsis
Gazra nîvîn (Core Loss) û gazra hysterêsis (Hysteresis Loss) du cûre taybetîn gazrên di cihandaro electromagnetic de. Wan yekbûyî ne hatinan lê çimkirdan werên ve û mekanîzmên taybet. Ji navbera li vir vê dawiyê, pêşkêşkirina detayî ya wan du cûre taybetîn gazrên û pêşkêşkirina berdewaman:
Gazra Nîvîn
Gazra nîvîn derbarê hêza taybetîn energyê ku di ser nîvîna materialê de digire ji bo procesê magnetizasyonê di magnetic field alternatif de. Gazra nîvîn esasî an jî du parçeyê: gazra hysterêsis û gazra eddy current
Gazra Hysterêsis
Gazra hysterêsis derbarê hêza taybetîn energyê ku di ser materialê nîvîn de digire ji bo fenomena hysterêsis di procesê magnetizasyonê de. Hysterêsis derbarê delyekeyan magnetic induction B dihêne magnetic field strength H. Her demê magnetizasyonê her tiştikê energyê bêdike, ku wek heat digerandin, formê gasira hysterêsis.
Gazra hysterêsis dikare bi formulê veguherîn:
ji ku:
Ph gazra hysterêsis e (unit: watts, W)
Kh constant e ku bi propertyên materialê ye
f frequency e (unit: hertz, Hz)
Bm maximum magnetic induction e (unit: tesla, T)
n exponent hysterêsis e (sagirîn an jî 1.2 û 2)
V volume core e (unit: cubic meters, m³)
Gazra Eddy Current
Gazra eddy current derbarê hêza taybetîn energyê ku di ser materialê nîvîn de digire ji bo eddy currents induced di magnetic field alternatif de. Wan eddy currents di materialê de flow in û generate joule heat, leading to energy loss. Gazra eddy current related to resistivity of the core material, frequency, and magnetic induction.
Gazra eddy current dikare bi formulê veguherîn:
ji ku:
Pe gazra eddy current e (unit: watts, W)
Ke constant e ku bi propertyên materialê ye
f frequency e (unit: hertz, Hz)
Bm maximum magnetic induction e (unit: tesla, T)
V volume core e (unit: cubic meters, m³)
Berdewam
Common Factors:
Frequency
f: Both core loss and hysteresis loss are proportional to the frequency. Higher frequency results in more magnetization cycles within the core, leading to higher losses.
Maximum Magnetic Induction
Bm : Both core loss and hysteresis loss are related to the maximum magnetic induction. Higher magnetic induction results in more intense magnetic field variations, leading to higher losses.
Core Volume
V: Both core loss and hysteresis loss are proportional to the volume of the core. Larger volumes result in greater total losses.
Different Mechanisms:
Hysteresis Loss: Primarily caused by the hysteresis phenomenon in the core material, which is related to the magnetization history of the material.
Eddy Current Loss: Primarily caused by eddy currents induced in the core material by the alternating magnetic field, which are related to the resistivity of the material and the magnetic field strength.
Summary
Core loss is composed of hysteresis loss and eddy current loss. Hysteresis loss is mainly related to the magnetization characteristics of the core material, while eddy current loss is mainly related to the eddy currents induced by the alternating magnetic field. Both are influenced by frequency, magnetic induction, and core volume, but they have distinct physical mechanisms. Understanding the nature and relationship of these losses is crucial for optimizing the design of electromagnetic devices and improving their efficiency.
