OS (Falcon OS In Backtrack 5 R1)

The end ring of the rotor normally has one or two central contact pins which contact the peripherally mounted commutator bars. Typically the armature winding is distributed along the length of a bar, and the brush and insulation can serve as the commutator insulator. The end of the winding is then soldered to the stub, before the winding turns on the end ring are 'binded' to the armature. An alternative approach is where the assembly is done in one go, with the winding layers in the correct order. Rarely, a single winding, called the 'end winding', may be run from both the armature and end ring. This is designed to allow the motor to run on just a single lead of the winding, a significant safety advantage.

A D-stub motor uses two or more winding sets of three phases. The windings are similar to those in a PSC motor but are connected in series as a single winding to a special ring called the 'end ring'. The D-stub motor can be used with a 'J-ring' bearing that allows it to run from only one or two leads of the winding. However, the J-ring bearing limits the maximum speed of the motor and does not allow retrofitting to other bearing designs.

The ratio of armature teeth or coil turns to the number of poles around the armature determines the power factor of the motor. Power factor is the cosine of the phase angle. It is not important for conventional induction motors or for single-phase motors.

The phase angle of a motor winding is defined as the difference in the starting timing of induction and external field flux patterns. The timing of the external field flux is defined as the point at which the magnetic flux through the rotor of the magnet equals the flux induced in the coil by the external field. The phase relationship of external and induced fields is one of the most important factors that controls the motor's torque and speed. Thus, correct modeling of a motor requires good knowledge of its external field, so that both the external and induced fields are determined in the model to the desired accuracy. d2c66b5586