48V High Power Alternator
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| Comparison of BMG to Old School Alternator | Hybrid 48V 300A Peak Bi-directional Motor Generator with Scotty AI (BMG) | Traditional 48V 130A Alternator with Wakespeed 500 remote field control. | Winner | |||||
| “Alternator” Type | Hybrid Excitation Synchronous Generator (permanent magnets + hairpin windings) | Field-excited rotor only | BMG | |||||
| Rotor Design | 16 permanent magnets + excitation windings | Field windings only | BMG | |||||
| Power Density | 1.65 kW/kg (advanced hairpin) | Lower due to round-wire winding | BMG | |||||
| IP Level | Brushless Motor: IP25. Waterproof Inverter: IP6K9K | Generally Brushed IP23 or lower | 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 NVH | BMG | |||||
| Efficiency | Higher (permanent magnets + hairpin winding) | 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 kW | 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 | |||||
| Load Dump Protection | Inverter/motor diagnostics, 100% 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 48V BMG | ModelSHSA4801 – Max 300A | 48VSHSA4802 – Max 240A |
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Operation Voltage | 24V or 48V Power up to 60V |
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Operating Temperature | -40℃～105℃ |
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Maximum DC Output | 300A@48V | 240A@48V |
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Application | Trucks | 4WD, SUV, Sprinter and Vans, Marine Engines |
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Continuous Power | 8.9 KW @ 25℃ (ambient temp),6000RPM 7.3 KW @ 55℃(ambient temp),6000RPM | 8.2 KW @ 25℃ (ambient temp),6000RPM 6.6 KW @ 55℃ (ambient temp),6000RPM |
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Turn-on Speed | 500 RPM engine speed | 500 RPM engine speed |
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Maximum Speed | 18000 RPM Intermittent |
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Control Mandatory Requirement to Operate | Scotty Ai V3 3000W or 1500W Model; RVC is available for Sprinter |
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24V or 48V Battery Compatibility | Most BMS with CAN controlled Lithium Batteries. Lithium Batteries without CAN BMS can be managed but a stop charge function on these batteries must be available. Scotty Ai V3 manages many non compliant Lithium battery banks. |
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Temperature Protection | Yes |
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Load dump Protection | Yes |
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Weight | 9 KG | 7.7 KG |
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Dimension | 164 L x 150 D mm | 156 L x 150 D mm |
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Overal Efficiency | 85% |
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Cooling | Integrated Dual Fans |
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Rotation | Clockwise/ Counter Clockwise |
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Pulley | PK belt specification |
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Case Construction | Cast and Billet Machined Aluminium Alloy |
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Mild Hybrid Mode | Yes Available as an option see body of document for requirements |
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Isolation Level | H Insulation Class H is rated to withstand a maximum operating temperature of 180°C |
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IP Level | Motor: IP25 Inverter: IP6K9K |
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This eBook explains how BMGs work, their efficiency, their impact on fuel economy and how the Mild Hybrid can work
Safiery's BMG is a Mild Hybrid Enabler
This is an alternative to a BMG: bolting a pancake generator to front of marine engine. Its a High Efficiency Generator plus DC DC
This package has three parts:
- 10kW high Efficiency Bi-Directional Magnet Generator at over 92% efficiency.
Sets this at 10kW engine load for 9.3kW electrical output. Compare to an alternator at 60% efficiency: 10kW engine load produces 6kW electrical output.
PMG produces 50% more output for same engine load. - Silicon Carbide Inverter/Charge to control the PMG at 98% efficiency. It has supervisory control from Scotty AI connected by CAN to lithium battery bank.
- 48-12V DC DC at 1500W with Scotty AI Patented control system. No 12 battery is required. up to 125A at 12V can be produced.
- Higher Efficiency: The SCOTTY AI V3 PMG is an Interior Permanent Magnet (IPM) motor, known for superior efficiency compared to traditional alternators. This results in 50% more effective energy conversion during regenerative processes.
- Compact and Lightweight Design: Weighing approximately 18 kg and measuring 208 mm in diameter with a length of 172.8 mm, the SCOTTY AI V3 PMG is designed for high power density. This compactness facilitates easier integration into various systems, especially where space and weight are critical factors.
- Higher Power Output: While a traditional alternator may be limited to 6 kW, the SCOTTY AI V3 PMG can deliver a peak power of up to 32 kW and a rated power of 10 kW, providing greater capacity for energy regeneration.
- Durability and Environmental Resistance: The SCOTTY AI V3 PMG is fully certified to IP69K standards, ensuring it can withstand high-pressure and high-temperature washdowns. This makes it suitable for harsh operating environments where traditional alternators might be susceptible to damage.
- Optimized for Automated Manufacturing: The design of the SCOTTY AI V3 PMG has been optimized for high-volume production, ensuring consistent quality and performance. This optimization can lead to cost savings and reliability improvements over traditional alternators.
