Lynch motor

[2] The Lynch motor is built from ferrite blocks sandwiched between strips of metal, instead of conventional copper coil windings, and is held together purely by magnets.

LIN also financed the construction of prototypes, including a batch made by Ouroussoff Engineering, which incorporated some ideas used in subsequent motors.

From 1989, LIN sought a company to manufacture the motor, having already successfully made small batches and individual units.

The traditional Lynch motor design has a spinning armature held on a spindle between two banks of eight fixed permanent magnets.

Also stationary are eight brushes (four negative, four positive) on the front side which allow electric current from the power source to reach the armature.

Each coil leg contains several bends before reaching the outside of the armature to be able to pass radially through the ferrite ring before the ends finish 90 degree apart.

The inner edge of the copper strips have the insulation removed on the front face only, to form the commutator surface where the brushes make contact.

As the armature spins, current flows from the one brush, into the commutator, outwards along one copper coil leg, which is sandwiched between the iron ferrite core pieces.

In the design of the Lynch motor armature, the iron laminations are made from individual thin rectangular pieces slotted together to form a full circular ring.

This unique helicopter set a Guinness World Record on 12 August 2011, and received the IDTechEx Electric Vehicles Land Sea & Air award in 2012.