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Comparison of BMG to Old School Alternator
Hybrid 48V 300A Peak Bi-directional Motor Generator with Scotty AI (BMG) Hybrid Excitation Synchronous Generator (permanent magnets + hairpin windings)
Traditional 48V 130A Alternator with Wakespeed 500 remote field control.
Winner
“Alternator” Type
Field-excited rotor only
BMG
16 permanent magnets + excitation windings
Rotor Design
Field windings only
BMG
Power Density
1.65 kW/kg (advanced hairpin)
Lower due to round-wire winding
BMG
Brushless Motor: IP25. Waterproof Inverter: IP6K9K
Generally Brushed IP23 or lower
IP Level
BMG
Dual Stator Design
Dual three-phase, 30° shifted
Single three-phase
BMG
Ripple Current Reduction
Significant (30° phase shift)
Higher ripple
BMG
Noise Vibration Harshness Performance
Optimized (low ripple and torque smoothness) Higher (permanent magnets + hairpin winding)
Higher NVH
BMG
Efficiency
Lower (field-excited losses)
BMG
Fault Tolerance
Dual stator allows operation in partial failure
Single stator, no redundancy
BMG
Peak Generator Power
12 kW
6.2 kW
BMG
Peak Efficiency
≥ 85%
60–70%
BMG
Power at Idle (engine ~600RPM)
3.0kW
300-500W Typically
BMG
Continuous Power Hot
≥ 5.5~7.0kW
5~7.0 kW
BMG
Maximum Speed
18,000 RPM
~8,000–10,000 RPM
BMG
Operating Temperature
-40°C to 105°C
-20°C to 80°C
BMG
Lifetime Expected
10 years, 300,000 km, 8,000 hrs
5–7 years, 150,000–200,000 km
BMG
12V, 48V Negative Isolation to Earth
Yes
No
BMG
Integration with Factory 12V or 24V Alternator
Full Integration for added power as solar backup at idle
None
BMG
Inverter/motor diagnostics, 100% load dump protection
Load Dump Protection
Limited and depends on Battery
BMG
ISO 26262 ASIL B Automotive Safety
Compliant
Not compliant
BMG
Insulation Grade
Grade H (180°C)
Grade F (155°C)
BMG
Safiery Pty Ltd ABN: 87 624 588 807 45/8 Distribution Court, Arundel QLD 4214 (07) 210 22 55 3 safiery.com Confidential and Proprietary. Copyright Safiery Pty Ltd 2025 Scotty Ai is protected by International Patent
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