Since 1949, Transformer Manufacturers, Inc.’s (TMI) expertise in manufacturing quality custom transformers and magnetic products has enabled us to solve problems for our customers while meeting or exceeding their specifications and requirements.  We manufacture custom-designed transformers for a wide range of industries including Transformer manufacturing is our core business and all products are proudly made in America. TMI serves the global market from our facilities centrally located in the Chicago transportation hub.  Rely upon Transformer Manufacturer Inc.  as your magnetics manufacturing partner for:  Value engineering Prototyping Quality centered manufacturing Value-added manufacturing services Just-in-time and other delivery options High quality products Custom solutions