No need the power supply when it works.
Bipolar excitation working
mode, the sensor outputs a pair of positive and negative electrical
pulse signal when the magnetic field polarity changes for a
circle.
Only when the external magnetic field polarity changes, magnetic
strength reaches the excitation threshold, the sensor will outputs
a pulse signal, so the vibration won't happen. The operation is
stable and reliable.
The signal amplitude has nothing to do with the magnetic field
changing speed, and it can work at the speed near to
zero.
The signal processing is simple, and it can be directly connected
with transistors, comparators, A/D converter, etc.
The output signal can be remote transmitted by the signal lines,
it's suitable for LAN management.
No mechanic contact, no spark, is a kind of intrinsic safety
devices.
Wide operating temperature range, strong environmental
adaptability.
Principle
description
Zero power consumption sensor WG631 (It also called Wiegand
sensor), it is a kind of new type magnetic sensor, which is
produced based on Wiegand effect theory, it can active produce
energy. It no needs external power supply when it works, it can
send sharp voltage pulse signals, The sensor is consist of alloy
wire which is special processed, induction coil which winds
outside, frame and lead wire.
The alloy wire owns double magnetic structure, its inner core is
soft magnetic, its shell is hard magnetic. To utilize the
difference of the magnetic between the inner and outer of the alloy
wire, under the excitation by proper strength of the alternating
magnetic field, the magnetization direction of inner core
overturned instantly, it pointed to the same or opposite direction
with the shell magnetization direction, and it leads to the sudden
change of the magnetic field arround the alloy wires, then it
generated a pair of positive and negative electric pulses in the
induction coil. The pulse amplitude is only related with strength
of the excitation magnetic field, and it has nothig to do with the
changing speed of the magnetic field, it can realize "Zero
speed"counting detection.
Performance
Index
Parameter |
Symbol |
Min. |
Typ. |
Max. |
Unit |
Excitation magnetic field |
B |
5.5 |
8 |
12 |
mT |
Pulse signal amplitude |
Vo |
1.5 |
- |
- |
V |
Pulse Width |
τ |
10 |
- |
30 |
us |
Internal DC resistance |
R |
250 |
- |
350 |
Ω |
Operate Frequency |
f |
- |
- |
5 |
kHz |
Operate Temperature |
B |
-40 |
- |
125 |
ºC |