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Motor winding fault detection circuits

A fault detection circuit and motor winding technology, applied in the motor winding fault detection circuit, in the field of motor winding fault detection, can solve the problems of reducing motor performance, damaging the motor, and motor imbalance.

Active Publication Date: 2018-02-16
TEXAS INSTR INC
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  • Application Information

AI Technical Summary

Problems solved by technology

Winding faults actually reduce the number of turns in the affected phase of a three-phase motor, which can unbalance the motor, reduce the performance of the motor and / or damage the motor

Method used

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  • Motor winding fault detection circuits
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Embodiment Construction

[0038] The drawings are not necessarily to scale. Wherever applicable, the same reference numbers will be used throughout the drawings and the accompanying written description to refer to the same or like parts.

[0039] When the machine experiences a turn-to-turn stator fault, the impedance of the phase leg on which the fault occurs will be reduced. If the motor is driven by a three-phase inverter in the current mode, the control loop will compensate for the impedance change by applying a small voltage to the faulted phase leg to maintain current balance. However, less voltage will be required to maintain a given current in the phase leg that is experiencing a fault, and the voltage will thus be unbalanced.

[0040] Three-phase motors are driven using a combination of three electrical signals with different phases. In a three-phase system, signal components can be converted into "positive sequence" (for example, forward rotation), "negative sequence" (for example, reverse r...

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Abstract

In described examples of motor winding fault detection circuits and methods to detect motor winding faults, an example fault detection circuit (900) includes: a positive sequence voltage calculator (902) to calculate a positive sequence voltage value (954) for a three-phase motor; a positive sequence current calculator (904) to calculate a positive sequence current value (956) for the three-phasemotor; an interpolator (908) to calculate an expected negative sequence voltage value (938a, 938b) based on the positive sequence voltage value (954), the positive sequence current value (956), and measured characteristics of the three-phase motor; a negative sequence voltage calculator (906) to calculate a measured negative sequence voltage value (936a, 936b) for the three-phase motor; and a fault detector (910) to detect that a winding fault exists in the three-phase motor when a difference between the expected negative sequence voltage value (938a, 938b) and the measured negative sequence voltage value (936a, 936b) satisfies a threshold.

Description

technical field [0001] The present invention relates generally to motor fault detection, and more particularly to motor winding fault detection circuits and methods for detecting motor winding faults. Background technique [0002] In a three-phase motor, a winding fault occurs when a portion of the insulation surrounding an individual winding wears away and a short circuit occurs between the conductors. Winding faults actually reduce the number of turns in the affected phase of a three-phase motor, which can unbalance the motor, reduce the performance of the motor, and / or damage the motor. Contents of the invention [0003] In the described examples of motor winding fault detection circuits and methods to detect motor winding faults, the example motor winding fault detection circuit includes: positive sequence voltage calculator, positive sequence current calculator, interpolator, negative sequence voltage calculation devices and fault detectors. The Positive Sequence Vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34H02K15/00H02H7/09
CPCG01R31/343G01R31/346
Inventor S·J·费迪干
Owner TEXAS INSTR INC
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