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Sigma-7 AC servo drives deliver market leading performance

09 May 2017

A new range of AC Servo Drives which provide simple and fast commissioning, maximum machine throughput and operational reliability has been introduced by Yaskawa.

The compact Sigma-7 servos (200V Series & 400V Series) cover a wide power range from 50W up to 15kW in various formats with the largest motors offering a continuous torque of 95Nm and a peak 224Nm. 

They represent a powerful response to the demands of today’s production engineering machine builders and end-users in packaging plants, semi-conductor manufacturing, digital printing and wood processing. The Servo Drives are initially released with embedded EtherCAT and Mechatrolink3 communications with further connectivity options to follow. 

With 25 years of development know-how and more than nine million servo axis in operation around the world Yaskawa has experience in helping users to maximise the performance of their machines. The Sigma-7 Servo is the latest example of this capability as demonstrated by some important features and benefits. For example, quick set-up in just three minutes thanks to pre-sets in the amplifier software to simplify commissioning, a ‘tuning less’ function enabling immediate use without the need for complex parametrisation or special knowledge of control equipment, along with an auto-tuning function to ensure quick adjustment. 

Energy-efficiency is likely to be high on most operators ‘wish lists’ and with this in-mind the Sigma-7 motor is designed to operate with up to 20 percent less heat generated. Furthermore, the possibility of DC power coupling of axes offers the potential for sharing and energy savings of up to 30 percent.

The drives also meet the demands to save space without compromising performance as their ‘book-style’ housing design supports side-by-side installation of amplifiers. 

This means they can operate in small spaces to enable high density performance inside smaller cabinets allowing for both drive and control electronics to be integrated in the machine. 

Sigma-7 drives are also designed to help end-users achieve lower production costs, with features such as speed loop bandwidth of 3.1kHz, shorter settling time, reduced positioning time resulting in higher throughput. 

Sigma-7 drives are designed for maximum accuracy and precision courtesy of a 24-bit absolute encoder ensuring a resolution of 16 million pulses per revolution for extremely precise positioning. This is combined with a fast, smooth operation with features such as ripple compensation to meet the highest demands for smoothness and dynamics, even for applications where speed loop gains cannot be set high. 

The drives are also designed with the essential safety features to ensure they meet today’s mandatory safety standards. For example, the STO function is implemented by default in all Sigma-7 servos so they comply with the requirements of SIL 3 and PL-e, while the safety functions SS1, SS2 and SLS can be integrated by using the safety module. 

More information at: https://www.yaskawa.eu.com/en/products/drives-motion/new-sigma-7-servo-drives/


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