- #1
LittleBrother
- 12
- 0
Question 1: Why use an iron core armature?
I took an old electric motor apart to study it. I noticed the armature has windings around an iron core. Iron is used to concentrate the magnetic flux. But iron is also attracted to the electromagnets used to repell the armature windings! It seems to be both a push and pull situation. Granted it is a greater push than pull or the motor would not spin. So, to avoid the iron core being attracted to the electromagnets, why not use a non-ferrous metal for the core? Is the benefit gained from using iron to concentrate the magnetic flux that significant?
Question 2: Why does it become more difficult to turn a generator when a load is placed on it?
I've read that this is the case, but I haven't been able to find out why. What happens inside the generator to cause the drag?
Question 3: How do I safely connect a battery to a coil/electromagnet?
I've read that connecting a coil/electromagnet to a car battery could cause the battery acid to heat and expand and possibly cause the battery to rupture. What is the typical safe way to power a coil/electromagnet using a battery? Potentiometer? Or is it more complex?
Thanks in advance.
LB
I took an old electric motor apart to study it. I noticed the armature has windings around an iron core. Iron is used to concentrate the magnetic flux. But iron is also attracted to the electromagnets used to repell the armature windings! It seems to be both a push and pull situation. Granted it is a greater push than pull or the motor would not spin. So, to avoid the iron core being attracted to the electromagnets, why not use a non-ferrous metal for the core? Is the benefit gained from using iron to concentrate the magnetic flux that significant?
Question 2: Why does it become more difficult to turn a generator when a load is placed on it?
I've read that this is the case, but I haven't been able to find out why. What happens inside the generator to cause the drag?
Question 3: How do I safely connect a battery to a coil/electromagnet?
I've read that connecting a coil/electromagnet to a car battery could cause the battery acid to heat and expand and possibly cause the battery to rupture. What is the typical safe way to power a coil/electromagnet using a battery? Potentiometer? Or is it more complex?
Thanks in advance.
LB