1 Overview
This Manual applies to claw-pole dual three-phase air-cooled Bidirectional Motor Generator MG, with motor and inverter integrated and a connected Scotty AI. The Key differences between this technology and traditional Alternator (with remote field regulators) is: • Asymmetric dual three-phase stator design that gives redundancy and high power • Hybrid Excitation Technology that gives precise control and high power at idle. • Hairpin Windings that significant increase power density • Space Vector Pulse Width Modulation Control • Inverter with AEC Q101/Q200 Certification rather than diodes to convert AC to DC power The result is a premium DC generator with exceptional power quality, reliability, and operational flexibility. The benefits in performance, especially for critical DC power applications, are substantial. The high power density and the dual winding system provides significant operational advantages. The Key Difference between using Scotty AI to control the BMG compared to a Remote Regulator (Balmar, Wakespeed, Zeus, MG Energy) is the following: • Scotty AI is 100% Digital CAN Control compared to Analog Field Current with others. • Scotty AI reads the generator toque and ensures that power load stops immediately if engine appears overloaded. This is particularly important in small marine 30hp / 40hp. • Scotty AI prohibits 100% a load dump scenario should the 48V battery BMS relay open and the stop charge function is either too slow or not working correctly. • Scotty AI maximises the power at idle up to 5,000W when the DC DC is also connected to the 12V alternator and arbitrages the best power combination between the two power sources while maintaining acceptable alternator and inverter temperatures. This is especially import during solar backup when idling the engine. The BMG Power is seen as an “alternator” on the Victron Cerbo GX display as well as the Safiery App.
48V Lithium Bank
BMG
Scotty AI
Master Controller Reads from any Lithium Bank: CAN if available, Voltage otherwise Has wire-in stop charge Reads BMG RPM, Motor/Inverter temp. Sets Power limit calculated using AI of the max power the connected engine can deliver at the current RPM Adjust Max Power based on Inverter temperature and motor temperature. Sends Power instruction to BMG of Voltage Setpoint and Current Setpoint to charge Lithium Bank that is within the Power Limit Calculated above.
Max 58V Min 40V
RPM Torque Temperature Power
Voltage Current
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