A disc-type commutator is incorporated and external connection to the phosphor-bronze brushes is by means of a pair of 4mm sockets.
DC electric motor having 2-pole armature wound with enamelled copper wire and a permanent magnetic field provided by a removable bar magnet.
The motor operates on 6-8V DC. 

Physics School Lab Equipment Suppliers in India 

Ltekonline are the manufacturers of Demonstration Electric Motor Energy Transfer Lab used to demonstrate engineering principles in Engineering Colleges, Engineering Schools and Physics Lab Experiments for Engineering Teaching Lab in Universities