Windage torque is proportional to speed.

Friction torque can be divided into three components.

Stiction can only be present at standstill.

Viscous friction is independent of speed.

Static friction must be overcome before the motor can accelerate.

The graph shows the nature of load torque when it is opposed by fluid.

The graph shows the nature of load torque when it is opposed by fluid.

The graph shows the nature of load torque of compressors where windage dominates.

Torques due to gravitational force are active load torques.

Torques due to torsion are passive load torques.

Torques due to windage are passive load torques.

Passive Load Torques retain their sign when the direction of the drive rotation is changed.

Active Load Torques retain their sign when the direction of the drive rotation is changed.

Coulomb torque is dependent on speed.