Tomorrow’s Technology Today ™
What is a Bi-directional Motor Generator and how does it differ from an Alternator? § The Safiery Bidirectional Generator produces up to 240A at 48V at 90% Efficiency. § Compare to traditional alternators which produce from 100A to 160A at 70% efficiency. § A BGM is at it’s core a Permanent Magnet Generator which has rotor windings replaced by permanent magnets. Because there is no rotor excitation, rotor excitation losses – about 30% of total conventional generator losses – are eliminated. This results in high power density and small size with the highest efficiency at all speeds. § A traditional alternator uses diodes and either an internal regulator to convert the AC power to DC or an external regulator like a Wakespeed. § The BMG requires an inverter that converts AC to DC and to control the speed and torque of the motor. The dynamic response of this inverter controller far exceeds an alternator. It has: § High Precision Control. § High Energy Efficiency. § Flexibility to operate efficiently over a wide range of speeds and load conditions. § The Safiery BMG also uses HES Technology (Hybrid Excitation Synchronous). This combines permanent magnet (PM) excitation and electromagnetic excitation at the Stator (not rotor). § This hybrid excitation mechanism overcomes the limitations of low output power at low RPM. The Safiery BMG outputs more than 2000W at idle compared to a few hundred watts with a traditional 48V alternator and remote regulator. § Being Bidirectional feature means the Safiery BMG can operate as a mild hybrid. It can switch from generating power to being a motor and giving additional torque and power to the engine. What role does Scotty AI play with the Bidirectional Motor Generator? § Big power needs to be handled securely and at high speed. Scotty AI V3 becomes an integral part of the power system with the BMG providing this functionality: § SCOTTY AI V3 determines if the mode of operation is “power generation” or “power motor as a mild hybrid” or at “idle”. It seamlessly switches between the modes. § Communicates with CAN BMS lithium batteries and continuously calculates the charging parameters integrating these with the BMG control. § Assesses non-CAN BMS lithium batteries and continuously calculates the charging parameters integrating these with the BMG control. § Controls the BMG power at different speeds so when a vehicle or boat accelerates from idle, the torque is relaxed to have less load on the engine. § Controls the BMG based on temperature rise of the inverter, motor speed and torque to give smooth power across the range of engine RPM. § Controls the BMG so that the connected DC DC gives maximum power when called for by high power 12V or 24V devices like winches. § Using the DC DC functionality, independent to the BMG, charges the same or an alternate 24V, 36V or 48V battery bank. The charging parameters can be completely different. § Using DC DC functionality, independent to the BMG charges the starter battery so only the BMG is present on the engine with NO 12V or 24V alternator. § Scotty AI V3 connects to the Victron VE.CAN bus with no negative impact to Victron control on the same bus. § Scotty AI V3 can be compatible with RVC and share the BMG performance data on the RVC network. § SCOTTY AI V3 has a connected App that is used for tuning with a patented auto-tuning feature as well as setting up charging parameters for the BMG and DC DC independently. Watch Test Rig Videos on our Youtube channel.
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
Powered by FlippingBook