SAO PAULO, Sept 13 (Reuters) - Brazilian motor maker WEG SA said on Tuesday that it has signed up to a strategic partnership with state-run oil firm Petrobras to develop a 7 megawatts onshore wind turbine.

Petrobras will invest 130 million reais ($26.28 million) over the next 25 months in the project, which is already being developed by WEG, the motor maker said in a securities filing. ($1 = 4.9469 reais) (Reporting by Peter Frontini; Editing by Steven Grattan)