MJRM

MJRM

MJRM

Product catalog summary
Specifications:
The MJRM model offers power up to 6,500 kVA and voltages up to 690 V. It features a frame size ranging from 250 to 900 and is available with 4, 6, 8, 10, and 12 poles. The cooling system is IC 81W/IC 86W, with an enclosure type of TEWAC (Totally Enclosed Water to Air Cooled). The degree of protection is IP 44, extendable to IP 56.
Main Applications:
This generator is suitable for auxiliary, hybrid, off-shore, variable speed, propulsion, and shaft generator applications.
Standards and Certifications:
The generators comply with IEC EN 60034-1, BS 4999-5000, VDE 0530, NF 51-100, NF 51-111, OVE M-10, and NEMA MG 1.32. They conform to EU rules and can be UL/CSA certified upon request. A Marine Survey Certificate is provided, and the design is assessed by ABS.
Construction Details:
The housing is made of rigid, welded steel with side ribs for strength. The shield is made of spheroidal graphite or grey cast-iron up to 630 frame size, and structural steel above. The shaft is carbon steel, forged from 290 mm diameter and above, and tested for defects.
Technical Data:
The heat exchanger is mounted on top, with a double tube made of CuNi 90/10, designed for pressures up to 10 bar. The cooling system uses external water and internal air circulation. The stator and rotor cores are laminated and insulated to minimize losses, with the rotor being of the salient pole type.
Bearing Information:
Bearings are either antifriction or sleeve type, with a theoretical lifetime exceeding 50,000 hours. Bearings can be insulated to prevent harmful currents, and configurations are available to withstand marine inclinations.
Insulation and Protection:
The stator and rotor are VPI treated with polyester amide resin. Protective treatments include epoxivinilic and polyacrylic coatings. Overloads are permissible under specific conditions, and generators are equipped for parallel operations.
Performance and Features:
Generators comply with marine transient performance rules, with a voltage drop within 15% for a 60% load application. They feature Class B Group 1 radio interference filters and maintain a THD of less than 2%. Vibration levels adhere to ISO 10816 standards.
Optional Features:
Options include reinforced construction, flanged shafts, increased protection degrees, redundant systems, and various auxiliary devices. Additional features can be customized upon request.
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Catalog excerpts

MJRM-4

General data Single or double antifriction bearing grease lubricated (ball or roller type) or oil lubricated sleeve bearing. The theoretical lifetime of bearings, L10h according to ISO 281/1 standard, of standard horizontal construction generators, without external forces (radial and / or axial) is in excess of 50.000 hours. On request, the lifetime of bearings, L10h can be in excess of 100.000 hours. Locating bearings are on the D end side and floating bearings on the ND end side. Bearing selection Antifriction bearings up to 560 frame size included. Sleeve bearings from 630 frame size included...

 Open the catalog to page 4
MJRM-6

Auxiliary device Automatic voltage regulator mounted on board. RTD devices in standard configuration: 1+1 RTD on each phase of stator winding 1 RTD on each bearing Terminals in auxiliary terminal box. Other configurations available: DUPLEX type RTD for inlet / outlet air RTD for inlet / outlet water

 Open the catalog to page 6
MJRM-7

Optional features Reinforced construction for high linear vibrations flanged shaft for direct coupling with engine flywheel (in case of single bearing solution) neutral point terminals in separate terminal box terminal box inside air duct (internal terminal box) cooling system IC 86W with additional forced ventilation cooler mounted on side increase protection degree up to IP 54, IP 55 or IP 56 lifted feet to couple the generator with engine on existing baseframe redundant rotating rectifier with 12 diodes insulated bearing and earthing brush AVR supplied loose automatic power factor control...

 Open the catalog to page 7
*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.