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Results tagged with magnetic-flux
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user 17574
The sum normal component of a magnetic field passing through a surface.
0
votes
Infinitely linear torque with current in motor?
BLDC motors vary in \$\omega L/R =\$ ratio constant slightly for similar max RPM. At 0 RPM, the coil only has real resistance and the current rises to 10 or 12x rated load current or I.start=Imax * ( …
- 148k
3
votes
Accepted
What does the m symbol for magnetic flux mean? Why is it needed when the phi symbol exists?
m is the mass of one ferromagnetic material which was equated from two possible masses m1,m2 into one. The Magnetic potential,M has been defined by the energy per pole of magnetic flux per unit in th …
- 148k
2
votes
Accepted
When to use a Hall probe and when a fluxgate magnetometer to measure magnetic fields?
I don't know the threshold for where you could use either, but a Hall Sensor is used for much higher current and detects magnetic force from the Hall Effect while some magnetometers can detect a magne …
- 148k
0
votes
Question for increasing the Flux of an electromagnet
Would that not increase the strength of the electromagnet by thousand fold?
Yes or No if it saturates the magnetic flux capacity, then it behaves like resistor wire and drawn much more current.
…
- 148k
1
vote
Accepted
Why is the magnitude of mutual flux in a transformer independent of the current in primary?
Mutual coupling is dependent on the core material only that is shared between
windings.but it does require an excitation voltage and current to energize this magnetic coupling. But that is independen …
- 148k
1
vote
Tesla’s AC motor: questions on operation
Iron is randomly oriented dipoles and can be very lossy in high BH fields.
Grain-oriented rolled steel laminates have the advantage of dipole alignment and the thinner layers between insulated Silicat …
- 148k
0
votes
Is it possible to determine a low power isolation transformer maximum output current?
Typically the VA is determined by the internal wire temp rise due to primary and secondary losses. P=Ip²Rp+Is²I
But most small transformers are rated by impedance with a 10% Vdrop from no load to rat …
- 148k
0
votes
Magnetic field strength and flux density from hysteresis curve
Using a big shunt cap load rounds or bulges out your VI plot and gives incorrect results with some low frequency voltage. It makes it impossible to determine what stored energy or Remanence or mutual …
- 148k
2
votes
Magnetic force as a function of PWM frequency
Voltage rises with f to maintain same A-rms then eddy current losses rise with thickness and frequency greatly even at 60 Hz , which is why they use thin laminated transformer steel for iron.
The …
- 148k
1
vote
Confusion - ideal transformer on load
TL;DR
There is always a primary current with no load due the fact that the mutual coupling requires primary inductance current of about 10% of rated load. Then a unity turns ratio transformer can matc …
- 148k
3
votes
Why does inductor core saturation depend on the temperature?
At high temperatures, the thermal energy of the system is greater than the magnetic energy, EmJ. The Curie Temperature where the different magnetic domains cancel, and the relative permeability drops …
- 148k