Discussion in 'General Electronics' started by Jaspreet, Nov 23, 2003.

1. ### JaspreetGuest

Hi,

What i want to know:
I just want to ask a very basic question.
bi-directional and two quadrant energy meters are uni-directions (or
ratcheted). I want to know what are these four quadrants ( preferebly
on cartesian chart shown below)and how does a meter operated in these

4 Quadrant and 2 quadrant action of a motor is described below. But a
meter can't act as a generator. Then why people describe meters as two

============================================================================
What i know :
comes from the speed vs. torque chart. It is normally a Cartesian
coordinate chart where the +/- speed is the x axis and the torque is
in the +/- y axis. See chart [hopefully intact]

t|
II o| I
r|
q| speed
------------u--------------
e|
III | IV
|
|

Two quadrant means that the motor drive operates between quandrant I
and III. These types of motor can not stop instantly and reverse
directions.

of drives can do both "motoring" (I & III) and generating (II & IV).
The motor acts as a generator when its inertia is continues to rotate
it one way when it is in reverse rotation.

-----------------------------------------------------------------

Please explain it in cartesian coardinates, if possible.

Regards,
Jaspreet