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This application note describes the SENT SPC protocol and demonstrates how to use a Teledyne LeCroy oscilloscope to verify a consistent Master Trigger Pulse (MTP) length.
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The T3AWG3k-series High-Definition (HD) Arbitrary Waveform Generator with the Waveform Editor SW Utility combined with the High-Definition (HD) Teledyne LeCroy Oscilloscopes provides a far superior insightful High Definition stimulus-response measurements set-up. The ability to generate a multiple carrier testing scenario with 16-bits vertical resolution (HD), Output Voltage swing up to ±12 Vpp (into 50Ω) and waveform memory up to 1 GPts. points can be an invaluable tool in troubleshooting complex signal transmission systems.
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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.
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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.
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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.
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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.
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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.
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