Permanent magnet excited brushed DC motors

Brushed DC motors excited with permanent magnet material can be found in a wide range of applications. The largest market segment for this type of motor and their predominant use is found in the low-power range. New developments in the area of high-energy permanent magnet material offer the opportunity of miniaturization and promise a cost-effective design. Starting with a brief summary on the permanent magnet material, special design considerations and typical constructions followed by motor applications of radial and axial field configurations are discussed. Particular attention must be paid to the construction of the permanent magnet excited brushed DC motor with respect to the manufacturing costs. Common winding arrangements and cost-effective lamination constructions are presented to illustrate different manufacturing techniques and possibilities.