Motor drive analysers (MDAs) from Teledyne LeCroy combine three-phase power analyser static (steady-state) calculations, dynamic three-phase power and mechanical motor analysis capabilities, and 1GHz embedded control system debug in a single instrument.
The MDA800 series of analysers is based on the HDO8000 oscilloscope platform and are standard with eight input channels (16 digital channels optional) with 12bit resolution, 2.5Gsample/s sample rate, up to 1GHz bandwidth and up to 250Mpts/channel acquisition memory. A set of serial trigger/decode and analysis software options, and a variety of voltage and current probes are available.
The MDAs can be used to design and manufacture motors, motor drives, variable frequency drives, variable speed drives, industrial automation and motion control equipment.
A complete drive system is a 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.
The MDA permits waveform captures from the drive three-phase power section, individual power transistors, and embedded control system, and performs coincident three-phase power analysis of the power section waveforms in one instrument, enabling debug and analysis of the complete motor drive.
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 with the acquisition waveform, and corresponds to information normally provided by a power analyser that measures in a “static” (steady-state) operating mode.
The MDA also 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 others 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.
The long acquisition memory provides capabilities for motor, motor drive, and three-phase power dynamic response analysis. For example, 25s of continuous acquisition capture is possible at a sample rate of 10Msample/s to understand dynamic drive behaviours, such as start-up, application of load, or fast changing load conditions, and correlation of drive response problems to control system instructions or power section failures. Zoom+Gate mode provides one button set-up of zoomed waveforms for all voltage, current, mechanical, or other probed signals. Per-cycle synthesised waveforms and numerics table results are automatically gated to the zoomed area, and results updated instantaneously as the zoomed area is scrolled through the original acquisition or changed in zoom ratio. This allows a quick way to understand drive system behaviours and root-cause of abnormalities.
Software permits integration of nearly any type of speed, rotation or position sensor, including analog and digital (pulse) tachometers, Brushless DC (BLDC) Hall sensor, Quadrature Encoder Interface (QEI), and resolvers. Hall sensor and QEI signals can be integrated through digital inputs, preserving analogue input channels for other signals.
Standard passive or active voltage probes and current probes from the company may be used for power measurements. In many cases, probes required for embedded control or power section debug can be used for power measurements. Other voltage and current measurement devices (potential or current transformers, current transducers, Rogowski coils) may also be easily and simply integrated.
A 350 MHz model, a 500 MHz model, and a 1GHz model are available.
http://www.teledynelecroy.com
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