Unlike the conventional starter rotor winding, which uses round wires, the PS starter uses square wires. With such an arrangement, the characteristics that are achieved by using multiple turns of round wires can be obtained without increasing the weight. As a result, the starter torque has been increased and the rotor winding has become more compact. The surface of the conductors of the square rotor winding is used as a collector, whereby the overall length of the starter PS has been reduced.
Pic. 2.33. Starter components: 1 - anchor; 2 - yoke; 3 - brush; 4 – permanent magnet; 5 - end collector
Instead of the excitation windings used in a conventional starter, the PS starter has two types of permanent magnets: main magnets and interpole magnets. The main and interpole magnets are installed alternately in the yoke, whereby the magnetic flux generated between the main and interpole magnets is added to the magnetic flux generated by the main magnets. In addition to increasing magnetic flux, this design reduces the overall length of the yoke.
Pic. 2.34. Comparative diagram of conventional and PS starters: 1 - anchor; 2 - brush; 3 - collector; 4 - end collector; 5 - square conductor; 6 - round conductor
Pic. 2.35. Starter yoke cross section: 1 - yoke; 2 – interpole magnets; 3 - anchor; 4 - main magnets; 5 - magnetic flux of the main magnets; 6 - magnetic flux from the interaction of the main and interpole magnets
Table 2.9. Starter Specifications
* Drive side.