What is the effect of permanent magnet strength in generator

[Baluncore]

What all changes can we see if we use different types of permanent magnets with varying magnetic strength... I would like to know , will the work needed to rotate armature increases if we increase the strength of permanent magnet?

IMO this discussion should be in a public thread, not a conversation.

how to do that pls help

 

[jim hardy]

Have you looked up how a dynamo operates?

Permanent magnet is the field so it sets initial flux
and voltage generated is flux X a constant for that particular machine X RPM

so. If increased voltage causes the machine to deliver more power to its load, well of course it'll require more power at the shaft.

 

[meBigGuy]

In different words,

The work required is determined by the load power consumed. Power out = power in * efficiency

Stronger magnets mean you may not have to turn as fast to get the same power out. But, turning slower, you need more torque (have to push harder to produce the same power in), which may be desired, or not desired (depends on the drive system).

Depending on the design, different magnet strengths will affect the efficiency, but I'd consider that a secondary effect. (wow , effected a sentence using both effect and affect :) )