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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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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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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.
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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.
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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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Complex industrial machines use motor drives to add precision to industrial processes. Understanding the complete motor and drive electrical operation on a per-phase basis can aid in understanding how the motor and drive react as load conditions change, such as in this cylindrical grinding machine from Fritz Studer AG.
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Rotors with magnets configured for variable magnetization can minimize losses in a propulsion motor at different rotor speeds and loads. Varying the magnetization requires the motor drive control system to acquire data and make calculations during a very short magnetization period. Teledyne LeCroy’s MDA810 Motor Drive Analyzer acquires and analyzes the controlled energy pulse trajectory to ensure proper operation of the motor drive and control system.
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