Technical Library

Technical Library

The Application Notes section of the Teledyne LeCroy Technical Library lets you search for, browse, and print the latest technical documentation. A search aid allows you to filter documents by category or keyword.

Application Notes on this site are available in PDF format for easy download.

Application Notes

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Volt-second Sensing Control Analysis in a DB-DTFC with the Motor Drive Analyzer

Deadbeat-direct torque and flux control (DB-DTFC) is being explored as an alternative to field-oriented controls (FOC) or direct torque control (DTC) due to its ability to achieve fast torque dynamics, manipulate losses without compromising torque, and utilize full DC bus voltage at voltage-limited operation. Evaluating the Volt-second sensing accuracy requires a precise measurement of Volt-seconds as the reference. Teledyne LeCroy's Motor Drive Analyzer provides such capabilities over each power-semiconductor switching period.

Examining a Vehicular Propulsion Motor with the Teledyne LeCroy Motor Drive Analyzer

One road to thorough characterization and analysis of a vehicular propulsion motor and its associated drive circuitry involves use of analog torque load cells and analog tachometers to assess drive output to motor-shaft mechanical output efficiency. Whereas traditional power analyzers provide only a static mean measurement capability, Teledyne LeCroy’s Motor Drive Analyzer provides static and dynamic power analysis coupled with long acquisition times for comprehensive analysis of the motor/drive’s performance and efficiency.

Using CAN Digital Data for Speed Calculation in the Teledyne LeCroy Motor Drive Analyzer

The Controlled Area Network (CAN) serial data protocol communicates information over a serial bus in automotive and industrial applications. For motor applications, CAN data may contain digitally encoded electric motor shaft speed. The MDA extracts this encoded data, converts it to an analog value, rescales it, and then uses it in the MDA as a source for motor shaft speed.

Using a Quadrature Encoder Interface (QEI) with the Teledyne LeCroy Motor Drive Analyzer

Digital encoders, such as QEIs, provide motor shaft speed and angle feedback to motor drive control systems. The MDA can easily interpret these signals and convert them to speed and angle values that can be used for calculation of mechanical power, for comparison to a reference speed feedback signal, or for comparison to other control and power signals.

Two-wattmeter-method, Three-phase Power Calculations with Accurate Line-Line to Line-Neutral Conversion

The two-wattmeter method reduces from six to four the number of input channels required to measure power on a three-phase system. With this method, the calculated power values from each line-line voltage and line-neutral current pair are not in phase or balanced, though the total three-phase power value is correct. However, the Motor Drive Analyzer (MDA) performs a line-to-line to line-neutral conversion and displays accurate and balanced per-phase power values that aid in understanding proper three-phase system operation.

Small Motor Efficiency Measurements Using the Teledyne LeCroy Motor Drive Analyzer

More than 90% of motor and motor-drive designs involve small, low-power motors and drives used in household, commercial, or light industrial applications. Such motors need not meet rigorous IEC or NEMA efficiency standards, but engineers still want to measure their designs’ efficiency. The Teledyne LeCroy Motor Drive Analyzer measures drive and motor efficiency at a bench without an expensive and/or scarce dynamometer.

Six-phase Motor Analysis using the Motor Drive Analyzer

Motors with more than three-phases suit applications calling for redundancy and high reliability. The MDA captures voltage and current signals from both winding sets, measures total static and dynamic power consumption, and calculates balance amongst the two winding sets.

Using a Resolver Interface with the Motor Drive Analyzer

Motor drives utilizing complex control systems (e.g. Vector field-oriented control or FOC) commonly use a resolver interface to provide signals to the control system for calculation of motor shaft speed, angle, and absolute position. The control system requires this information for correct calculation of the required drive output signals. A resolver interface makes debugging and validating drives and control systems much easier when a power analyzer, such as Teledyne Lecroy's Motor Drive Analyzer, calculates speed, angle, and position directly from the resolver interface and displays them as waveforms.