Keyence Launches Battery-Free Servo System With EtherCAT Support

Keyence has introduced the SV3 series, a new EtherCAT servo system designed to increase machine speed, accuracy, and reliability while cutting maintenance costs. Built on the global popularity of the EtherCAT industrial Ethernet protocol, the SV3 series combines ultra-fast communication with enhanced servo performance to meet the needs of next-generation automation.

Keyence’s SV3 series motion system pairs with the company’s KV-X series PLC for high-speed tracking. Image courtesy of Keyence

SV3 Series Servo System

The SV3 series servo system supports a maximum motor speed of 7,000 revolutions per minute, representing a 20 percent increase over previous models. It also incorporates a 26-bit encoder with roughly 67 million pulses per revolution, providing 16 times higher resolution than Keyence’s SV2 series. This level of precision enables smoother movements, more accurate stops, and the ability to maintain tight tolerances even under demanding conditions.

Additionally, the SV3 servo drive features a velocity frequency response of 3.1 kHz, about 1.2 times faster than the SV2. This higher responsiveness improves tracking performance during positioning and allows the motor to react quickly to disturbances. When combined with a Keyence KV-X series PLC, the SV3 system achieves a 62.5 microsecond communication cycle. The result is faster takt times, improved motion accuracy, and a motion control environment capable of keeping pace with complex multi-axis applications.

The SV3 servo system features battery-free absolute position control. Image courtesy of Keyence

Battery-Free Absolute Positioning

One of the main changes in the SV3 series is its battery-free design. Conventional servos use batteries to hold absolute position data, creating ongoing replacement costs and maintenance work. The SV3 design removes that need, cutting upkeep and storage requirements while improving reliability over time.

Despite the absence of a battery, the motors deliver full absolute positioning capability, supporting up to 65,535 revolutions of memory. To further simplify maintenance, the system also provides predictive lifecycle information, giving operators data to plan preventative maintenance and avoid unplanned downtime.

The SV3 servo system features a 16 times higher encoder resolution than Keyence’s earlier SV2 series. Image courtesy of Keyence

Next-Generation Motion

The SV3 series brings together EtherCAT networking, a 26-bit encoder, fast response, and a battery-free design to raise both accuracy and reliability. Keyence provides free software that helps engineers choose the right servo. By entering details of the machine and its motion profile, the program points to suitable SV3 models. This reduces trial and error, speeding up the design process.

The SV3 line spans from small 50 W motors up to 5 kW models, giving machine builders options for applications that demand higher speed, precise motion, and less maintenance. Options include straight-axis or splined shafts, with or without electromagnetic brakes. Every version carries an IP67 rating for dust and water protection and meets IEC 61508 SIL3 safety standards.