Indian Navy has issued a Request For Information (RFI) for the development of an Indigenous 5MW Propulsion motor to be used on existing and future conventional submarines. tender documents accessed by, calls for 6 units of 5MW Propulsion motor from the Original Equipment Manufacturer (OEM) under Indigenously Designed Developed and Manufactured (IDDM) category.

As per tender documents, the 5MW Electric Propulsion motor is intended to be used in the propulsion system for the submarine to provide mobility for surface and underwater operations. Power supply to the 5MW Electric Propulsion motor will be provided through the main batteries of the submarine and should have a shaft output of 5MW and should have a maximum weight of 71tons.

As per tender documents, the winning vendor will have to complete the project within 30 months from the date of the signing of the contract. In the first 15 months, he has to finalize the design and the configuration of the 5MW Electric Propulsion motor and in 26 months start the development of a land-based prototype for the land-based trials and testing and validation should be completed by 36 months.


In a Diesel-Electric submarine, the various systems in the Propulsion system are made up of Diesel Generators, Fuel Cell Batteries, Air Independent Propulsion (AIP) Systems, and a Propulsion motor. The Propulsion motor draws its power from the main battery of the submarine which eventually drives a propeller through a single shaft. What will be the application of this 5MW Electric Propulsion motor is yet to be revealed but it’s unlikely to be used on the existing submarine fleet in the Indian Navy. Electric Propulsion motors that generate power output for the shaft in a range of 5-6MW are usually seen on Diesel-Electric submarines that have submerged displacement of 3000-4000 metric tons.  

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