Avo Multi-amp Corporation

Avo Mutli-amp Corporation Dba Megger

Craig Powers

Adam Bierman

A method for magnetic/impedance burst testing of large electric motors to determine broken rotor bar defect. The method providing a portable tester and includes a Signal Processor, a single-phase power source VAC, an AC/DC boost converter connected to the power source, at least one energy storage device connected to the AC to DC boost converter, a Pulse Width Modulated drive module (PWM) connected to the at least one energy storage device, and a series of at least three switches (IPM) using switch/level boost-type PWM rectification. The burst test is repeated until a full rotation of magnetic angles are tested and recorded with the Signal Processor. Rotor impedance versus magnetic angle of the full rotation is verified in order to check for failure, and broken rotor bar defect is determined when a shift in measured stator's impedance/admittance level for any of the given magnetic angles is identified by the Signal Processor.

Method for magnetic burst testing of large electric motors with portable tester powered by a domestic wall outlet

A system for magnetic/impedance burst testing of large electric motors to determine broken rotor bar defect. The system being a portable tester and includes a Signal Processor, a single-phase power source VAC, an AC/DC boost converter connected to the power source, at least one energy storage device connected to the AC to DC boost converter, a Pulse Width Modulated drive module (PWM) connected to the at least one energy storage device, and a series of at least three switches (IPM) using switch/level boost-type PWM rectification. The burst test is repeated until a full rotation of magnetic angles are tested and recorded with the Signal Processor. Rotor impedance versus magnetic angle of the full rotation is verified in order to check for failure, and broken rotor bar defect is determined when a shift in measured stator's impedance/admittance level for any of the given magnetic angles is identified by the Signal Processor.

System for magnetic burst testing of large electric motors with portable tester powered by a domestic wall outlet

Methods for magnetic burst testing of large electric motors with portable tester powered by a domestic wall outlet

A partial discharge detection board includes a voltage divider configured to attenuate a voltage of a reflected signal. A buffer is connected to the voltage divider. The buffer attenuates frequencies of the reflected signal that are greater than an upper cutoff frequency. An analog-to-digital converter is connected to the buffer. The analog-to-digital converter receives portions of the reflected signal up to the upper cutoff frequency, and the analog-to-digital converter converts the reflected signal from an analog domain to a digital domain. A filter is connected to the analog-to-digital converter. The filter attenuates frequencies of the reflected signal that are less than a lower cutoff frequency. A comparator is connected to the filter. The comparator compares the voltage of the reflected signal to a reference voltage. A counter is connected to the comparator. The counter increments when the voltage of the reflected signal is greater than the reference voltage.

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Fort Collins, CO, United States of America

Craig Powers