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Permanent Magnet Generators

Newton Derby is a main supplier of Permanent Magnet Generators (PMGs) To the major European manufacturers of large Synchronous Generators and Motors. These PMGs have been developed to provide excitation supplies for the exciter field systems of larger rotating machines that operate at continuous speeds of up to 3600 rpm.

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Newton Derby prides itself on the quality of its design and development skills, enabling the company to offer special equipment for the most demanding applications, in addition to its established product range.

With its expertise in PMG/PMA (Permanent Magnet Generator and Alternator) technology, Newton Derby is able to offer a range of Stator/Rotor units or self-contained PMG machines that are produced in a variety of mechanical forms, dependent on the application and required method of mounting.

PMG Stator/Rotor Unit

The Rotor is directly mounted on the shaft of the main generator or motor usually by means of a shrink-fit and key. The PMG stator housing is usually foot or flange mounted into the enclosure of the main machine.

Shaft-End Mounted PMGs (Tacho Style)

Directly mounted on the shaft end of the main generator or motor without the need for a flexible coupling or adaptor. The PMG stator housing is prevented from rotating by a flexible mount fixed to its underside.

Foot Mounted PMGs

These can be supplied for the customer to mount on the base frame and couple to the parent machine.

If you have an enquiry, please get in touch.

Tel: +44 113 255 5666
Email: sales@newtonderby.co.uk

Skirt Mounted PMGs

Supplied for mounting onto the end of the parent machine via direct flexible coupling, these can be supplied to suit the customer’s own requirements.


  • Power Generation
  • Oil & Gas
  • Renewable Energy
  • Subsea
  • Military
  • Marine

Options and Benefits

  • PMG’s can be supplied as Stator/ Rotor units, or as fully enclosed auxiliary machines.
  • PMG’s are designed incorporating either Alnico or Rare Earth type magnets depending on the application and specifications.
  • Variety of mechanical forms dependent on the preferred method of mounting.
  • PMG’s can be used as a generator for renewable energy (wind or tidal).

Speed (RPM) and Sizes

Newton Derby manufactures a large range of Permanent Magnet Generators in a variety of speeds and sizes to suit any application. Bespoke design solutions are our speciality.

Our Customers Include...

Electricity generation companies
in the UK and beyond including the largest coal fired power station in Western Europe

The rail industry including
Network Rail

Distribution network operators
throughout the UK

Oil, gas, petrochemical and industrial plants throughout the world

We would be delighted to discuss your power transformer requirements


Here are just a few of our Accreditations…