YASKAWA AC SERVO MOTOR SGMAH-01AAA21 NEW ORIGINAL 100W 0.91A 0.318NM 3000r/m

 

 

Mechanical Parameters, Load, Friction, Inertia

The performance of a stepper motor system (driver and motor) is also highly dependent on the mechanical
parameters of the load. The load is defined as what the motor drives. It is typically frictional, inertial or a
combination of the two.

Friction is the resistance to motion due to the unevenness of surfaces which rub together. Friction is constant with velocity. A minimum torque level is required throughout the step in over to overcome this
friction ( at least equal to the friction). Increasing a frictional load lowers the top speed, lowers the acceleration and increases the positional error. It  is true if the frictional load is lowered
Inertia is the resistance to changes in speed. A high inertial load requires a high inertial starting torque and the same would apply for braking. Increasing an inertial load will increase speed stability, increase the amount of time it takes to reach a desired speed and decrease the maximum self start pulse rate. It  is again true if the inertia is decreased.

The rotor oscillations of a stepper motor will vary with the amount of friction and inertia load. Because of
this relationship unwanted rotor oscillations can be reduced by mechanical damping means however it is more often simpler to reduce these unwanted oscillations by electrical damping methods such as switch fromfull step drive to half step drive.