Understanding the Core Technology of the BMG Asymmetric dual three-phase stator design that gives redundancy and high power Two separate three-phase windings in the same stator in an Asymmetric arrangement: Windings are shifted by 30° electrical (not the symmetric 60°). Creates a 12-pulse system when rectified to DC.
12-pulse rectification : Dramatically reduces output ripple Harmonic cancellation : 5th, 7th harmonics eliminated Redundancy : Can operate on one winding if other fails 50% power available during single-winding fault Fault isolation : Windings magnetically coupled but electrically separate Continued operation : Critical for mission- critical applications Distributed losses : Heat spread across more conductors
30-40% better heat dissipation than single winding Lower hot-spot temperatures: Extended insulation life Independent cooling paths : Better coolant flow options • Reduced torque ripple : 3.4% • Lower vibration : Smoother operation, less mechanical stress • Reduced bearing loads : More uniform force distribution • Quieter operation : Less acoustic noise
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Hybrid Excitation Technology that gives precise control and high power at idle. Offer unique advantages when operated as DC generators, combining the benefits of both permanent magnet (PM) and wound-field excitation.
Wide voltage regulation range : voltage from 50% to 150% of nominal Precise voltage control : ±0.5% regulation Load-independent regulation : Maintains stable voltage across varying loads Higher efficiency at partial loads : Field weakening reduces iron losses when full voltage isn't needed Extended speed range : Effective operation from 20% to 200% of rated speed
Low-speed performance : Strong power generation even at low RPM Overload capability : Can boost field for short-term 150-200% overload Lower ripple voltage : Hybrid excitation provides smoother field distribution Controlled shutdown : Can reduce field to zero for safe maintenance Redundant excitation : Can operate on PMs alone if field winding fails Short-circuit limiting : Field control provides inherent current limiting
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Hairpin Windings that significant increase power density • Excellent slot fill despite dual windings • Superior thermal coupling to cooling system • Precise manufacturing enables tight tolerances • Lower resistance maximizes efficiency gains • •
Reliability: MTBF increased 3-5X Cost: 20-30% higher initial cost
Ripple frequency: 12 × fundamental vs. 6 × Ripple amplitude: 75% reduction
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Voltage regulation: ±0.5% vs. ±2% Efficiency gain: 2-4% improvement
EMI: Significantly reduced DC filter size: 60-80% smaller
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Power density: 10-15% reduction (due to extra windings)
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