5

06/13

Symbol

Meaning

Unit

L/L

N

PF

Q

R

s

T

T

t

tan

U

Û

Z

Relative inductance change

Inductance of coil without core

Main inductance

Parallel inductance

Reversible inductance

Series inductance

Effective magnetic path length

Average length of turn

Number of turns

Copper (winding) losses

Transferrable power

Relative core losses

Performance factor

Resistance

Copper (winding) resistance (f = 0)

Hysteresis loss resistance of a core

Internal resistance

Parallel loss resistance of a core

Series loss resistance of a core

Thermal resistance

Effective loss resistance of a core

Total air gap

Temperature

Temperature difference

Curie temperature

Time

Pulse duty factor

Loss factor

Loss factor of coil

(Residual) loss factor at H  0

Relative loss factor

Hysteresis loss factor

Relative loss factor of material at H  0

RMS value of voltage

Peak value of voltage

Effective magnetic volume

Complex impedance

H

H

H

H

H

H

mm

mm



W

W

mW/g



















K/W



mm

°C

K

°C

s















V

V



/mm

Symbols and terms

Ferrites and accessories