- #1

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Is there a difference in function when inserting soft iron core in inductor , motor , generator ?

Thank you

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- Thread starter momomo_mo
- Start date

- #1

- 25

- 0

Is there a difference in function when inserting soft iron core in inductor , motor , generator ?

Thank you

- #2

- 388

- 3

[tex]B=\mu_r\mu_\circ{N\cdot I\over L}[/tex]

Here [tex]\mu_\circ=4\pi10^{-7}[/tex] is the permeability of vacuum.

[tex]\mu_r[/tex] is the permeability of the core of the coil. If the core is just air, [tex]\mu_r=1[/tex], and you obtain the same B as in the vacuum. For almost all substances [tex]\mu_r \simeq 1[/tex]. But for ferromagnetic ones (iron, nickel, cobalt, and a few more), [tex]\mu_r[/tex] can be very big, 10 000 or even 50 000. You get a magnetic field ten thousand times bigger!

"Soft" [iron] means that once you the current drops to zero, the iron do not stay magnetized. This is important in motors and the like because in alternating currents (and fields) "hard" iron has power losses.

- #3

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I see.Thanks for your information provided.

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