R
EV
9
11
A
MERICAN
M
AGNETICS
, I
NC
.
I
NTRODUCTION
: O
PERATING
C
HARACTERISTICS
This loss is sometimes a significant portion of the power required to
operate the system. It also does not provide for field polarity reversal.
F
OUR
-Q
UADRANT
O
PERATION
The Four-Quadrant Magnet Power Supply System illustrated in the
figure below offers the most control of all the modes of operation.
Efficiency is increased and reversible magnetic field profiles are
attainable without discontinuities in the current. The magnetic energy
sink returns a significant portion of the power to the AC line instead of
dissipating it as heat.
Disadvantages of the four-quadrant system include somewhat increased
cost of the power supply over unipolar power supplies or bipolar power
supply systems, and added complexity in protecting the power supply in
the event of AC power loss or magnet quenching. Nonetheless, modern
four-quadrant power supplies which include integral output protection
against AC power loss and magnet quenching are available at
reasonable prices.
Magnet
Coil(s)
Persistent
Switch
(optional)
Misc. Line Losses
Model 430
Shunt
V
Four-Quadrant
Power Supply
Current
Four-Quadrant System with Resistive Shunt
Summary of Contents for 430
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Page 28: ...12 REV 9 AMERICAN MAGNETICS INC INTRODUCTION OPERATING CHARACTERISTICS ...
Page 64: ...48 REV 9 AMERICAN MAGNETICS INC INSTALLATION POWER UP AND TEST PROCEDURE ...
Page 208: ...192 REV 9 AMERICAN MAGNETICS INC SERVICE RETURN AUTHORIZATION ...
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