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Servomotors / Servo Drivers

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Servomotors / Servo Drivers

Servomotors and Servo Drivers are provided for the purpose from replacing stepping motors to high-speed, high-precision control. Models with MECHATROLINK II communications are also provided. Concerning Servomotors/Servo Drivers, OMRON offers different products in different areas. So please click on the banner "Products links" in the top right corner to reach the country website nearest you.

Overview	Features
Principles	Classifications
Engineering Data	Further Information

Related Contents

Primary Contents

Servo Motor Selection Flow Chart
Formulas
Sample Calculations

Servo Motor Selection Flow Chart

Explanation	References
Determine the size, mass, coefficient of friction, and external forces of all the moving part of the Servo Motor the rotation of which affects.	---
Determine the operating pattern (relationship between time and speed) of each part that must be controlled. Convert the operating pattern of each controlled element into the motor shaft operating pattern.	Operation Pattern Formula
The elements of the machine can be separated so that inertia can be calculated for each part that moves as the Servo Motor rotates. Calculate the inertia applied to each element to calculate the total load inertia of the motor shaft conversion value.	Inertia Formulas
Calculation of Friction Torque Calculates the frictional force for each element, where necessary, and converts it to friction torque for a motor shaft. Calculation of External Torque Calculates the external force for each element, where necessary, and converts it to external torque of a motor shaft. Calculates the total load torque for the motor shaft conversion value.	Load Torque Formulas
Select a motor temporarily based upon the motor shaft converted load inertia, friction torque, external torque and r.p.m of a motor.	---
Calculate the Acceleration/Deceleration Torque from the Load Inertia or Operating Pattern.	Acceleration/Deceleration Torque Formulas
Calculate the necessary torque for each part of the Operating Pattern from the Friction Torque, External Torque and Acceleration/Deceleration Torque. Confirm that the maximum value for the Torque for each operating part (Maximum Momentary Torque) is less than the Maximum Momentary Torque of the motor. Calculate the Effective Torque from the Torque for each Operating part, and confirm that it is less than the Rated Torque for the motor.	Calculation of Maximum Momentary Torque, Effective Torque
Calculate Regenerative Energy from the Torque of all the moving parts.	Please see the user manual of each productfor the details on calculation of the regenerative energy.
Check if the the number of encoder pulses meets the system specified resolution.	Accuracy of Positioning
Check if the calculation meets the specifications of the temporarily selected motor. If not, change the temporarily selected motor and re-calculate it.	The following table

Specialized Check Items	Check Items
Load Inertia	Load Inertia ≤ Motor Rotor Inertia x Applicable Inertia Ratio
Effective Torque	Effective Torque < Motor Rated Torque Please allow a margin of about 20%. *
Maximum Momentary Torque	Maximum Momentary Torque < Motor Maximum Momentary Torque Please allow a margin of about 20%. * For the motor Maximum Momentary Torque, use the value that is combined with a driver and the one of the motor itself.
Maximum Rotation Speed	Maximum Rotation Speed ≤ Rated Rotation Speed of a motor Try to get as close to the motor's rated rotations as possible. It will increase the operating efficiency of a motor. For the formula, please see "Straight-line Speed and Motor Rotation Speed".
Regenerative Energy	Regenerative Energy ≤ Regenerative Energy Absorption of a motor When the Regenerative Energy is large, connect a Regenerative Energy Absorption Resistance to increase the Absorption capacity of the driver.
Encoder Resolution	Ensure that the Encoder Resolution meets the system specifications.
Characteristics of a Positioner	Check if the Pulse Frequency does not exceed the Maximum Response Frequency or Maximum Command Frequency of a Positioner.
Operating Conditions	Ensure that values of the ambient operating temperature/humidity, operating atmosphere, shock and vibrations meet the product specifications.