Six-Phase PM Motor Current Reconfiguration for Open-Phase Vibration
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Solution Overview
Problem
Existing fault-tolerant current algorithms for six-phase permanent magnet motors do not adequately address vibration performance during open-phase faults, which can deteriorate bearing life and destabilize the motor system, while also failing to optimize torque pulsation and electromagnetic performance.
Innovation Solution
A low-vibration fault-tolerant current algorithm is developed for six-phase permanent magnet motors, involving electromagnetic simulation, magnetomotive force reconfiguration, and phase angle adjustment to suppress vibration and improve torque performance under open-phase faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional fault-tolerant current algorithms are used to maintain torque output under open-phase faults, then torque capability is preserved, but vibration performance deteriorates
Solution Approach 1:
The patent changes the parameters of fault-tolerant current by optimizing the phase angles and amplitudes of currents in remaining healthy phases. By adjusting these parameters according to specific optimization formulas, the algorithm maintains torque output while minimizing vibration-causing harmonics, thus resolving the contradiction between torque capability and vibration performance.
Solution Approach 2:
The patent implements dynamic adjustment of fault-tolerant current parameters based on real-time motor operating conditions. The algorithm dynamically calculates optimal current distributions that adapt to different load conditions and fault scenarios, enabling simultaneous optimization of torque output and vibration suppression under varying operational requirements.
2Power
If third harmonic current injection is used to improve torque pulsation, then torque quality improves, but new current harmonics are introduced that worsen vibration performance
Solution Approach 1:
The patent converts the harmful effect of harmonics by strategically injecting third harmonic currents at optimized amplitudes and phase angles. Instead of treating harmonics purely as detrimental factors, the algorithm utilizes them constructively to improve torque quality while controlling their vibration-inducing effects through precise parameter optimization, thus transforming harm into benefit.
3Power
If fault-tolerant phase current is reconfigured to compensate for power loss, then torque reduction is mitigated, but current amplitude inconsistency prevents complete cancellation of reverse magnetomotive force
Solution Approach 1:
The patent achieves complete cancellation of reverse magnetomotive force by precisely optimizing the phase angles and amplitudes of currents in healthy phases. The algorithm calculates specific parameter values that ensure symmetric current waveforms, enabling perfect cancellation of harmful reverse magnetomotive force components while maintaining torque compensation, thus resolving the contradiction between torque maintenance and waveform symmetry.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The algorithm significantly reduces torque ripple and vibration amplitude, ensuring stable output torque capability and improved motor operation by optimizing magnetomotive force distribution and radial force components.
Implementation Method 1
Establishing an electromagnetic simulation model of the motor to simulate the torque, magnetomotive force distribution, and radial force distribution under the healthy operation
Implementation Method 2
designing the reconfigured synthetic magnetomotive force of the remaining phase windings for each open-phase fault type
Implementation Method 3
determining the phase angle of the remaining phase current and solving the expression of the low-vibration fault-tolerant current
Data Source
AI summary
A low-vibration fault-tolerant current algorithm for six-phase permanent magnet motors under open-phase faults is provided. When a six-phase permanent magnet motor is supplied through a full-bridge configuration, the vibration performance of the motor dramatically deteriorates if the open-phase fault occurs. The types of open-phase faults include one-phase open-phase, adjacent two-phase open-phase, non-adjacent two-phase open-phase, and at most three-phase open-phase faults. To suppress the deterioration of the vibration response when open-phase fault occurs, the remaining phase magnetomotive force is reconfigured based on the reverse magnetomotive force in the synthesized magnetomotive force from the residual phases under different open-phase fault types, and the remaining phase currents are adjusted to maintain normal vibration response.