Power Electronics

LEM is a market leader in providing innovative and high quality solutions for measuring electrical parameters. Its core products – current and voltage transducers - are used in a broad range of applications in industrial, traction, energy and automotive markets. LEM’s strategy is to exploit the intrinsic strengths of its core business, and develop opportunities in new markets with new applications.  

LEM products fall broadly into multiple areas of application and are used within general industry, automotive industry, for railway and trackside applications, energy measurement relating to railway on-board applications, energy & automation, battery monitoring, and in Wi-LEM - wireless sub-metering networks that measure energy consumption.

Industry applications

·         Isolated current and voltage measurement with instantaneous current or voltage output. Non contact or with integrated conductor or clip-on current measurement from 0.1 A to 20,000 A.

·         High voltage measurement from 10 V up to 6,400 V.

·         Different technologies used to cover required performances, such as accuracy from some ppm to several percents, or response time, bandwidth.

Traction and trackside applications

·         Isolated current and voltage measurement with instantaneous current or voltage output.

·         Non contact or with integrated bus bar, or clip-on current measurement from 0.1 A to 20 000 A.

·         High voltage measurement from 10 V to 6,400 V.

·         High modularity offered in the various designs for a high level of mounting flexibility. Large options available for the possible secondary connections inspired by the railway market need.

·         High performances reached (accuracy from 0.2% to 2.7%, short response time from few ns to several μs).

Energy & Automation applications

·         LEM integrated transducers combine in a single case the most advanced AC & DC sensing technologies with signal conditioning electronic circuits (RMS or True RMS, threshold detection, etc).

·         They feature a switch or relay type output or an electrically isolated standard signal (0-5VDC, 0-10VDC or 4-20mA) that can be directly handled by any PLC or monitoring device.

·         These products require complex adjustment and calibration operations and benefit from the LEM technology and manufacturing know-how to achieve the highest performance and quality level of the market.

Automotive applications

·         LEM Automotive specializes in developing and manufacturing current transducers for battery management and motor drive applications in cars, busses and trucks. LEM products can contribute to significant energy savings and an environmental friendly world. By controlling the current in energy-intensive applications LEM participates to the global effort to reduce consumption.

Battery monitoring

·         The Sentinel intelligent transducer measures cell voltage, internal temperature and internal impedance. It also provides cell voltage and temperature data during battery discharge. This data is passed via a proprietary serial comm. Bus (S-bus) to an Overview and Control System (OCS).

LEM components started in 1972 leverages its more than 35 years experience in the application, design and production of current and voltage transducers.  LEM is a market leader in providing innovative and high quality solutions for measuring electrical parameters. Its core products – current and voltage transducers - are used in a broad range of applications in industrial, traction, energy and automotive markets. LEM’s strategy is to exploit the intrinsic strengths of its core business, and develop opportunities in new markets with new applications.

LEM is a worldwide company, Head Quarters in Geneva with production facilities in Europe, Asia and America and offices across the globe.

PRODUCT LINES
Industrial Transducers
Traction & Trackside Transducers
Energy & Automation
Automotive Transducers

Industrial Transducers
Isolated measurement of current and voltage

In today’s world, efficiency of industrial applications is of increasing importance in order to save energy and money. Industrial applications are controlled by power electronics requiring optimal and accurate regulation of electronic parameters such as current, voltage and power. LEM uses innovative technologies to ensure the high degree of reliability and safety that our customers require.

Typical applications include:

AC variable speed drives
Servo motor drives
Static converter for DC drives
Battery supplied applications
Uninterruptible power supplies (UPS)
Switched-mode power supplies (SMPS)
Power supplies for welding, medical, mobile telecom, etc.
Pumps & fans control/monitoring
Induction cooking
Gas co-generator
Elevators
Forklifts
Air conditioning and ventilation equipment
Various converters (solar, wind generators)
Grid power control

With more than 2,500 current and voltage transducers in our portfolio, LEM offers a comprehensive range of accurate, reliable and galvanically isolated devices to measure current from 0.1 A to 20,000 A and voltage from 10V to 6,400V, across a range of technologies. LEM transducers are CE marked in recognition of their electromagnetic compatibility and compliance to EMC standards. The reference standard is EN50178 to comply with electrical performances and environmental constraints.