Electric Machinery

Synchronous generators convert mechanical energy to electrical energy. Large scale generators are used in Power plants that could generator electrical power in the range of hundreds of Mega Watts. Such generators work based on the principle of magnetic induction known as the Faraday’s law. The rotor creates magnetic field using Direct Current (DC) excitation. The rotor is then rotated using a prime mover thereby creating changing magnetic flux with respect to the stationary windings at the stator, magnetically inducing voltage into those windings. The mechanical speed of rotation of the generators is tied directly to the frequency of the Alternating Current (AC) that they generate. When electrical current is drawn from the generator three phases, a rotating magnetic field is created inside the machine which rotators at the same speed as the rotor excitation field, therefore the name “synchronous” generator.  The generator stator core is designed to prevent induction of currents inside the stator core. For this reason the core is constructed with insulated laminates and designed to have certain shapes. The core design is particularly important at the two end sections of the core were “fringing” magnetic flux could induce currents in those sections.

Our consultants are well versed in the design of electric machinery including synchronous generators. Exponent works closely with the electric utility and energy industry in matters relating to power generation, transmission and distribution.  This includes complex problems and failures in power plant generating equipment and the synchronous generators.  Our engineers have provided engineering services in numerous cases in this area, such as:

  • Failure analysis of large generator units
  • Consulting services during disassembly and core inspections of large generator units
  • Consulting services related to design and operation of large generator units
  • Expert reports and testimony related to generator design and failures analysis.

Exponent professionals also have extensive experience in electric machinery design, protection, unit capability analysis and reactive power generation, electric machinery testing and failure analysis.