Encyclopedia Magnetica™

[ Basic definitions ]

• Magnetism (types of magnetism)
• Electromagnetism
• Magnetic field
  • Flux density B
  • Field strength H
  • Confusion between B and H
  • Magnetisation M
  • Polarisation J
• Magnetic polarity
  • Magnetic poles (monopole, dipole, moment)
• Magnetic properties
  • Susceptibility χ or κ
  • Permeability μ (vacuum, relative, initial, complex)
  • Hysteresis loop (B-H loop, J-H loop, M-H loop)
  • Coercivity H_c (_BH_c and _JH_c)
  • Remanence B_r
  • Magnetic saturation (M_sat, J_sat, B_sat)
  • Demagnetisation (degaussing)
  • Magnetostriction λ
  • Barkhausen noise
  • Magnetic domain (domain wall)
• History of electromagnetism

[ Magnetic materials ]

• DATABASE of magnetic materials
• Periodic table of elements
• Magnetic materials (non-magnetic)
• Soft magnetic materials
  • Electrical steels
    • Non-oriented (NO)
    • Grain-oriented (CGO, Hi-B, DGO)
    • Electrical foils
  • Soft ferrites
  • NiFe alloys
  • CoFe alloys
  • Amorphous ribbons
  • Nanocrystalline ribbons
  • Powder materials
• Hard magnetic materials (magnets)
  • NdFeB (neodymium)
  • SmCo (samarium)
  • Hard ferrites
  • Alnico
• Semi-hard magnetic materials

[ Calculators ]

• All calculators
• Convert between CGS and SI units
• Effective permeability μ_eff
• Skin depth (skin effect)
• Proximity loss (Dowell curves) R_ac
• Magnetic coupling coefficient k
• Calculator of magnetic field of:
  • Round current loop
  • Rectangular current loop
  • Straight round conductor
  • Thin solenoid
  • Thick solenoid
  • Rectangular solenoid
  • Helmholtz coil
  • magnet (rectangular, cylindrical)
• Thermal resistance of ferrite cores R_th
• Power loss between volume and mass
• Inductance of a gapped inductor L
• Induction heating power

[ Magnetic circuits ]

• Magnetic circuit
• Magnetic core
• Air gap
• Fringing flux
• Leakage flux
• Laminations
• Insulation
• Wire
• Strand
• Coil
• Winding (primary, secondary, tertiary)
• Magnetic path length
  • Effective path length
• Cross-sectional area
  • Effective area

[ Magnetic losses ]

• Efficiency
• Power loss
• Energy loss
• Hysteresis loss
• Eddy current loss
• Excess loss (additional / anomalous)
• Proximity loss
  • Dowell's curves
• Core loss (or iron loss]
• Copper loss (or winding loss)
• Windage loss
• Mechanical loss
• Transition loss
• Switching loss
• Resistive loss (Joule heating)

[ Electromagnetic fields ]

• Field
• Magnetostatic field
• Magnetic field
• Electrostatic field
• Electric field
• Electromagnetic field
• Radiation field
• Acceleration field
• Thermal field
• Maxwell's equations
  • Faraday's law of induction
  • Ampere-Maxwell circuital law
  • Gauss's law for magnetism
  • Gauss's law for electrostatics
  • Biot-Savart law

[ Coils and Windings ]

• Winding (coil)
  • Primary winding
  • Secondary winding
  • Tertiary winding
• Bobbin
• Winding machine (linear, toroidal)
• Winding wire
  • Enamelled wire
  • Litz wire
  • CTC / Roebel cable
• Strand
• Bifilar winding
• Ayrton-Perry winding
• Non-inductive winding

[ Inductors ]

• Inductor
• Choke
  • AC choke
  • DC choke
• Common-mode choke
• Coupled inductor
• Air-cored inductor
• Flyback inductor
• Variable inductor
• Polarity of inductors

[ Transformers ]

• Transformer
• Autotransformer (Variac)
• Flyback transformer
• Current transformer (CT)
• Voltage transformer (VT)
• Rotational transformer
• In-rush current
• Laminations

[ Devices ]

• Coil (solenoid)
• Inductor
• Transformer (autotransformer)
• Motor
• Linear motor
• Electromagnetic actuator
• Relay
  • Reed relay
• Magnetic sensor

[ Magnetic sensors ]

• B-coil (induction coil, search coil)
• Needle-probe sensor
• H-coil
• Hall-effect sensor
• Fluxgate sensor
• Magnetoresistive sensor
• Magnetoelastic sensor
• Current sensor
• Rogowski coil

[ Electromagnetic motors ]

• DC motor
• Polyphase motor
• Induction motor (asynchronous)
• Synchronous motor
• Hysteresis motor
• Shaded-pole motor
• Switched-reluctance motor
• Permanent-magnet motor

[ Magnetism in Art ]

• Magnets in conservation, restoration, and display of art
• Database of magnetic properties of art supplies