Newton Derby has produced exciters for a variety of applications, including oil, gas, and hydro power. We have designed and manufactured for some of the largest blue-chip companies in the world. Newton Derby can manufacture exciters either to print, based on customer drawings, or we can design and manufacture from scratch based on a given specification.

We manufacture brushless exciters, supplied with a rotating rectifier, eliminating the maintenance usually required with sliprings and brushes. We can design exciters either to a new specification, or to replace an existing excitation system, in which case we will endeavour to replicate the characteristics of the existing exciter as closely as possible. If a complete excitation system is required, then we can also supply a PMG pilot exciter to go with the main exciter.

When carrying out the design of the exciters ourselves, we can work to a required field current and voltage, forcing ratio, and speed rating. The field will be designed to cope with the excitation available from the supply the customer wishes to use. Class F insulation is used in all our exciters as standard, which can withstand a temperature of 155°C, with higher temperature insulation available if necessary. Mountings available for our exciters include flange, skirt, or foot.

All our exciters undergo dynamic balancing and static tests including surge and flash testing, as well as insulation and winding resistance measurements. For dynamic tests, we can carry out open and short circuit measurements, overspeed, as well as on load tests up to a power of 100kW. Type tests are available upon request.