veritas
Electrical
- Oct 30, 2003
- 467
As I understand it the B-H curve follows a different trajectory on the increase and subsequent decrease of the excitation current. Briefly, when the current is reduced to zero, there is a remnant flux remaining and negative H is required to return the core flux to 0. Since energy is required to reduce the flux to zero I have seen hysteresis losses being mentioned. What is this loss exactly? Resistive? If it is energy required to re-align magnetic domains (and the associated frictional losses) to their original position then surely hysteresis exists at all times during a complete cycle as the domains are being aligned all the time (assume no saturation). What is the difference between the energy requirements to overcome hysteresis and the energy required to align the magnetic domains?