Introduction
In the increasingly complex maritime world, the need for reliable and efficient power supply is becoming increasingly crucial. Electric generators play a central role in meeting the energy needs of ships, ranging from small boats to luxury yachts and giant tankers. One of the major players in the maritime generator industry is MarelliMotori, with the MJRM and MJHRM generator series as its flagship products.

What is MarelliMotori Series Generators Marine MJRM – MJHRM?
MarelliMotori Series Generators Marine MJRM and MJHRM are types of alternating current (AC) electric generators specifically designed for marine applications. These generators are known for their high quality, outstanding reliability, and ability to operate in extreme environmental conditions.
Main Characteristics:
- Large Output Power: MJRM – MJHRM generators are capable of producing a large amount of electrical power to meet the ship’s energy needs, including for propulsion, electrical systems, and other onboard equipment.
- Marin Quality: These generators are designed with harsh marine environmental conditions in mind, such as high humidity, corrosion, and vibration.
- High Efficiency: The generator motors used in the MJRM – MJHRM series are designed to provide optimal energy efficiency, thereby reducing fuel consumption and operating costs.
- Customization: These generators can be customized to each vessel’s specific needs, including voltage, frequency, and type of cooling.
- High Reliability: With high-quality components and rugged construction, MJRM – MJHRM generators provide high reliability and long service life.
Key Advantages:
- Optimal Performance in Marine Conditions: MJRM – MJHRM generators are designed to operate optimally in challenging sea conditions, including severe weather and high waves.
- Fuel Efficiency: Efficient design helps reduce fuel consumption and vessel operating costs.
- High Quality: MarelliMotori is known for the high quality of its products, so you can be assured of the reliability of the MJRM – MJHRM generator.
- Service Support: MarelliMotori provides comprehensive service support to ensure smooth operation of your generator.
Typical Applications:
- Commercial Ships: Container ships, tankers, bulk carriers.
- Passenger Vessels: Ferry, cruise ship.
- Offshore Vessels: Oil and gas production platforms.
- Naval Vessels: Warships, patrol boats.
Latest Technology
MarelliMotori continues to innovate to improve the performance of the MJRM and MJHRM series generators. Some of the latest technologies implemented include:
- Digital Control System: Improves control accuracy and operating efficiency.
- Composite Materials: Increases strength and reduces generator weight.
- Liquid Cooling Technology: Improves cooling efficiency and extends generator life.
Technical Features
- SERIES: MJRM (Low Voltage) / MJHRM (Medium Voltage)
- POWER: Up to 12000 kVA
- VOLTAGE: Up to 15000 V
- FRAME: 315 – 1250
- POLES: 4 to 12
- FREQUENCY: 50/60 Hz or variable speed
- PROTECTION DEGREE (IP): 44 (up to 56 on request)
- COOLING METHOD (IC): 81W
- AMBIENT TEMPERATURE: 0°C to +60°C
- WATER TEMPERATURE: Up to 40°C
- AVR: E-Vo up to 630 frame; D-Vo Light above (Low Voltage) / D-Vo Light (Medium Voltage)
- BEARINGS: antifriction or sleeve (on request)
- APPLICATIONS: Auxiliary Generator, Shaft Generator, Hybrid Machine, Variable speed generator, Off-shore, PTO-PTI system
- STANDARDS: IEC 60034-1 – BS 4999-5000 – NEMA MG 1.32
- CERTIFICATIONS: Marine Survey Certificate
Main Options:
- Flanged shaft for direct coupling with engine flywheel (in case of single bearing solution)
- Reinforced construction for high linear vibrations
- Neutral point terminals in separate terminal box
- Raised feet to match engine baseframe dimensions (B20 – IM1101)
- Dedicated current transformer installed on neutral point (differential protection and measurement)
- Insulated bearing and earthing brush
- Excitation/overboosting PMG mounted on generator
- Arrangement for rotor earth fault protection 64R
- Arrangement for vibration sensors
Conclusion
MarelliMotori Marine MJRM and MJHRM series generators are the right choice for boat owners who want a reliable, efficient, and durable power supply. With their various advantages and flexibility, these generators have become a popular choice in the maritime industry.
Source: www.marellim
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