Inertia is the measurement axis rotation inertia of the rigid body, the moment of inertia is a characterization of the size of a rigid body rotation inertia parameters. It to the mass of the rigid body, the quality is related to the distribution of relative to the rotating shaft. （Refers to the ideal state of rigid body won't have any change of the object), the choice and encounter motor inertia, is also an important indicator of servo motor. It refers to the moment of inertia of the servo motor rotor itself, is quite important for deceleration of the motor. If not a good match of inertia, the motor action will be very not smooth.
the calculation of load inertia all the moving parts driven by a motor, regardless of the rotating parts, or linear motion components, all become the motor load moment of inertia. Motor shaft load on the total moment of inertia can be driven by calculating each component of inertia, and according to certain rules to be added.
1)Cylinder inertia such as ball screw and gear shaft rotates around its center of inertia can be calculated by the following formula: J = (πγ(32)* D4L (公斤cm2) for steel products, such as institutions can be calculated by the following formula: J = (0. * 10-786)* D4L (公斤cm2) type: & gamma; The density of material (kg/cm2）D cylinder straight through (cm）L the length of the cylinder (cm） 2)Axial moving object the moment of inertia of the workpiece, workbench, such as axial moving moment of inertia of the object, can be obtained from the following formula: J = W * (L/2π）2 (公斤cm2) type: W linear moving object (the weight of thekg）Per L motor is in straight line direction of the distance,cm）
3)Cylinder around the center of movement inertia: when the cylinder movement around the center of inertia belongs to this kind of situation example: as the big straight gear, in order to reduce the inertia, often on the disc evenly distributed holes dug up at this moment of inertia can be calculated this way: J * (R2 = Jo + W公斤cm2) type: Jo for cylinder revolve around its axis of inertia (kgcm2）W (the weight of the cylinderkg）R rotation radius (cm） 4)Relative mechanical variable speed motor axis of inertia calculation will be shown above the load moment of inertia of Jo convert to the motor shaft calculation method is as follows: J = (N1、N2)2 Jo: type in N1 N2 is the number of teeth on the gear
what is the effect of load, motor inertia ratio? in theory, the system inertia (Including servo motor + load)Is larger, the slower response time. But the moment of inertia of the motor is at the time of design has been considered. Nominal response time is also considering inertia precision and response time in the future.
the motor inertia is refers to the objects around the rotation of a shaft, in general around the x axis rotation with Ix said. the motor inertia is defined as: J = & sum; mi*ri^2 （1)Type a mi said rigid particle of the quality of the ri said the vertical distance from the axis of a particle. Motor inertia is the size of a rigid body rotation inertia parameters, it has to do with the quality of the rigid body, the quality is related to the distribution of relative to the rotating shaft. The moment of inertia of rigid body is made of quality, mass distribution, three factors determine the rotor position. (2)The same rigid body of different axis of rotation, who referred to the moment of inertia, must specify which axis of it is to make sense.
