Different formula for generator and motor ?

Click For Summary
Generator and motor effects utilize essentially the same formulas, with the primary distinction being the sign used in calculations. The generator convention applies when current and voltage rise in the same direction, indicating that the circuit element is producing power. Conversely, the motor convention assumes current flows opposite to voltage, signifying that the element is consuming power. These conventions are crucial in electrical engineering for understanding polarity. Overall, the differences lie in the interpretation of current and voltage relationships rather than in the formulas themselves.
omgange
Messages
1
Reaction score
0
Is there a different formula for generator and motor effects? What are they?
 
Physics news on Phys.org
Couldn't you find the formulae on Wikipedia?
They are, essentially, the same formula - or at least the same relationship. The main difference is the sign. RH generator rule - (generighter) and LH motor rule (motors drive on the left, in the UK).
 
I wonder if omgange is doing electrical engineering?

In EE the terms refer to polarity conventions.

If the current and voltage rise in the same direction across circuit element E, as on the left in the attached sketch, the circuit is said to be using the generator convention.
A positive VI product means that the element is sourcing or producing power and is thus acting as a generator.

If we adopt the motor convention then the current is assumed in the opposite direction to the voltage.
A positive VI product here means the element is consuming power.
 

Attachments

  • circuit element.jpg
    circuit element.jpg
    6.2 KB · Views: 580
I built a device designed to brake angular velocity which seems to work based on below, i used a flexible shaft that could bow up and down so i could visually see what was happening for the prototypes. If you spin two wheels in opposite directions each with a magnitude of angular momentum L on a rigid shaft (equal magnitude opposite directions), then rotate the shaft at 90 degrees to the momentum vectors at constant angular velocity omega, then the resulting torques oppose each other...

Similar threads

  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 4 ·
Replies
4
Views
1K
  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 16 ·
Replies
16
Views
4K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 6 ·
Replies
6
Views
8K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 1 ·
Replies
1
Views
1K