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Functional Module FMS Calculation of Rexroth Linear Module (Part 2)
Functional Module FMS Calculation of Rexroth Linear Module (Part 2)
Product details
Drive design based on the reference point of the motor shaft
When designing the drive, it is necessary to collect all the calculated values related to the mechanical components of the powertrain together and convert them onto the motor shaft.
Therefore, the following values must always be obtained for the combination of mechanical components within the powertrain:
1. Friction torqueMR
2. Moment of inertiaJex
3. * Maximum allowable speedvmech (* Maximum allowable rotational speed)nmech
4. * Maximum allowable driving torqueMmech
Calculate the numerical values of various mechanical components included in the powertrain based on the reference point of the motor shaft,friction torqueMR
*Maximum allowable speedvmech
The maximum allowable mechanical device speed is always determined by the minimum allowable speed of all mechanical components included in the powertrain, and this speed must be considered as the driving limit when designing the motor. Depending on the system, the maximum allowable speed or rotational speed of a linear system with a ball screw transmission mechanism is always below the limit of the coupling or toothed belt linkage component, thus determining the maximum allowable speed limit of the mechanical device.
When considering the entire powertrain (mechanical device+motor/regulator), the maximum torque of the motor can also be within the limits of the mechanical device（Mmech)
The following constitutes the maximum allowable driving torque limit for the powertrain.
If the maximum torque of the motor is within the limit of the mechanical device（Mmech）Above that, the maximum motor torque must be limited to the allowable mechanical device value
Rough pre selection of motor
The motor can be roughly pre selected according to the following conditions.
Condition 1:
The speed of the motor must be greater than or equal to the required mechanical device speed (up to the maximum allowable limit).
nmax≥ nmech
Condition 2:
Consider the ratio of rotational inertia between mechanical devices and motors. The ratio of moment of inertia is used as an indicator of the control quality of the motor regulator combination. The moment of inertia of a motor is directly related to its specifications.
Ratio of moment of inertia
During pre selection, the experience values shown in the table on the right can be used to achieve high control quality. What is involved here is not a fixed * limit, but when the required value exceeds this * limit, accurate consideration must be given to the specific application.
Condition 3:
Estimate the torque ratio between the static load torque and the long-term torque of the motor. The torque ratio must be less than or equal to the empirical value of 0.6. Roughly consider the dynamic values that are still lacking in the precise motion form with the required motor torque based on this condition.
In the "Configuration and Ordering" section, standard configurations including motor mounting components and motors can be created for different linear system size specifications by selecting options. By meeting the above conditions, it is possible to check whether the standard motor selected in the configuration is suitable for the application in terms of size specifications.
Accurate Drive Design
The rough pre selection of the motor cannot replace the precise drive calculation required by detailed consideration of torque and speed. When considering the basic motion form for accurate calculation of electric drive devices, performance data from the product catalog "Rexroth Drive Technology" must be used.
When designing the drive, it is necessary to comply with the maximum allowable speed, drive torque, and acceleration limits to prevent damage to the mechanical device.
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