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Teledyne unveils 8-channel motor drive analysers

04 Mar 2015  | Christoph Hammerschmidt

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Teledyne LeCroy has introduced the MDA800 series of motor drive analysers (MDAs) geared for developers of electric motor drives and related power circuitry. The devices combine three-phase power analyser static (steady-state) calculations, unique dynamic three-phase power and mechanical motor analysis capabilities, and high bandwidth (1GHz) embedded control system debug in a single instrument, described the company.

The MDAs are based on Teledyne LeCroy's HDO8000 oscilloscope platform and are standard with eight input channels (16 digital channels optional) with 12bit resolution, 2.5GS/s sample rate, up to 1GHz bandwidth and up to 250Mpts/ch acquisition memory. A complete set of serial trigger/decode and analysis software options, and a variety of voltage and current probes are available to use with the MDAs.

According to the company, the MDAs will be used by designers and manufacturers of motors, motor drives, variable frequency drives, variable speed drives, industrial automation and motion control equipment manufacturers. Design engineers that integrate electric motors into their designs, from cars to power tools and from appliances to elevators, will use the product to validate proprietary controls and complete drive system designs. Of course, for those who design three-phase systems without motors, the MDAs can be used for basic three-phase power system analysis and debug as well.

A complete drive system is a complex mix of three-phase power electronics, motor/mechanical analogue and digital sensors, and embedded controls, with a complex variety of analogue, digital, serial data and pulse-width modulated (PWM) signals. Conventional 8bit oscilloscopes are able to capture higher-speed embedded control system or power transistor activities. Power analysers are a single-use tool for measuring input/output 'black-box' drive power and efficiencies, but provide limited or no waveform capture for embedded control or drive system debug.

The MDA permits waveform captures from the drive 3-phase power section, individual power transistors and embedded control system, and performs coincident 3-phase power analysis of the power section waveforms in one high-performance instrument, enabling debug and analysis of all aspects of the complete motor drive.

Various voltage, current, power (real, apparent and reactive), phase angle/power factor, and efficiency parameters are calculated on acquired voltage and current waveforms and displayed in a Numerics table. The table is user-configurable and is displayed along with the acquisition waveform, and corresponds to information normally provided by a power analyser that measures in a static (steady-state) operating mode.

Additionally, the MDA provides numerical calculations under dynamic operating conditions. Waveforms showing any per-cycle measurement parameter variation can be 'synthesised' and displayed by simply selecting a table value. This waveform is time-correlated with other waveforms acquired by the MDA and can be used to correlate complex drive behaviours to other control or power system waveforms, and to debug drive system problems. Statistical detail of the measurement set can also be displayed. This additional information goes well beyond what is provided by a power analyser.

Standard Teledyne LeCroy passive or active voltage probes and current probes may be used for power measurements. In many cases, probes required for embedded control or power section debug can be used for power measurements, making incremental investments unnecessary. Other voltage and current measurement devices such as potential or current transformers, current transducers, Rogowski coils, etc. may also be integrated to the MDA.

1000VRMS isolation is available with Teledyne LeCroy's HVD Series HV differential probes, with a maximum 2000VPK-PK differential voltage rating and 1 per cent gain accuracy. These probes are high performance and very reasonably priced.

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