Project title: MAGNETOELASTIC SENSORS

Company name : ELFOR - SMART SENSORS LTD.

TECHNOLOGICAL FIELD
Sensing devices

KEY WORDS
Sensor, Magnetoelastic, Force,
Security Systems, Load

PROJECT SUMMARY
The magnetoelastic effect is the influence of the elastic stress
on magnetization. The effect consists of a change in the
magnetizing curve under a mechanical stress action.
Every magnetoelastic sensor consists of a ferromagnetic core, and
one or two windings. The high frequency power supply and the
output device employed, depend on the application.
The simplest configuration has one winding and is a "choke
sensor". While external forces act on the sensor's core, the
magnetic permeability and electric impedance change. The choke
sensor is connected with an additional resistor. The output
signal can be in the form of a voltage drop on the additional
resistor or a current in the circuit.
An improved design of the sensor has two windings, working like a
transformer, with a variable coefficient of transformation. Under
the action of external forces the output voltage changes. The
transformer sensor enables to adjust the output signal range and
to disconnect the primary and secondary electric circuits.

Compared to other physical effects, the magnetoelastic sensors
have several important ADVANTAGES:
1. Exclusive sensibility, considerable higher than that of strain
gauges.
2. High output voltage and output power
3. Extremely high reliability
4. Mechanical stiffness
5. Wide bandwidth and possibility to measure fast changes of
force and torque
6. Long life time
7. Small dimensions
8. Simple construction
9. Low cost

APPLICATIONS:
Industrial control and measurement systems and
Security applications

ENTREPRENEUR
Prof. Oleg Michailov

COOPERATION PARTNER
Tedea International Ltd.

PROJECT STATUS
The project is about to complete the first year of development.
Working prototypes have been designed and tested. First
applications are in course of being designed.

COOPERATION REQUIRED
A strategic partner involved in security systems manufacturing
and marketing.

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