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Servo Motors

FANUC’s servo motors feature high reliability, easy maintenance and exceptional electrical efficiency. Our servo motors are designed and manufactured with a focus on the ultimate in performance, reliability and efficiency. Our powerful high-speed machining technology and energy efficiency functions vastly reduce cycle times while ensuring a high degree of accuracy and precision.

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Types of FANUC Servo Motors

FANUC AlphaiD Servo Motor

ALPHA i-D Series Servo Motors

FANUC’s new generation servo system delivers high speed and high precision while reducing energy consumption. The enhanced servo performance has exceptionally smooth operation to achieve fine surface machining. The new pulsecoder delivers higher control for outstanding accuracy. Plus, this series comes with IP67 standard for waterproof protection in heavy washdown environments. The Alpha i-D Series Servo motors can be connected to current FANUC CNC Plus Series models.

Alpha i-B Series

ALPHA i-B Series Servo Motors

Our ALPHA i-B Series servo motors deliver ultra-smooth rotation and superior acceleration for compact high-speed and precision machines.

Beta-B Series

BETA i-B Series Servo Motors

FANUC produces four types of servo motors. Our BETA i-B Series servo motors offer a significant performance-to-cost ratio, making them ideal for entry-level machines.

LiS-B Series

LiS-B Series Servo Motors

The Linear LiS-B Series servo motors work without force transmission mechanisms to simplify machine design and maintenance and provide massive amounts of thrust force.

DiS-B Series

DiS-B Series Servo Motors

FANUC’s Direct Drive DiS-B Series servo motors are ideal for rotary tables and axes; they offer huge amounts of torque with an extremely smooth feed while achieving high speed, high precision and maintenance-free operation.

Commonly Asked Questions about Servo Motors

  • What is a servo motor?

    A conventional servo motor converts electrical energy into rotational motion. It comprises stator windings and housing, permanent magnet rotor and laminates, pulse coder and end rear bell along with front and rear bearings.

    The stator windings and housing represent the electromagnetic part of the servo motor. Its C-face mounting secures it to the frame of a machine or load that is to be controlled. Its ferrous core, made of steel laminates, focuses the magnetic field produced when electrical current flows in the copper winding. Embedded in the stator laminates, the copper winding is a 3-phase winding in FANUC’s star configuration. For each revolution of output from a servo motor, the 3-phase input power must be cycled four times. Hence, FANUC servo motors are built in what’s referred to as quadrature.

    The motor rotor is the rotating part of the motor that is usually coupled to a ball screw. It is made of an output shaft that is centered in an iron mass constructed of steel laminates. The rotor is suspended by a pair of bearings holding the output shaft in the center of the stator. The rotor’s magnetic field is made of permanent magnets that are embedded in the rotor. Usually, four pairs of north-south magnets exist, making most FANUC servo motors 8-pole motors.

  • How Does a Servo Motor Work?

    To cause motion between the permanent and electromagnet magnets used in a typical servo motor, current must be applied to the electromagnet’s winding. This causes a magnetic field to be generated around the conductor carrying the current. The magnetic field generated by passing current through a conductor will change polarity, depending on the direction of the current flow. The magnetic field induced by the wire is not enough to cause the second magnet to move.

    To amplify the magnetic field, the wire is stacked upon itself multiple times. By doing so, the magnetic field is multiplied by the number of wires stacked in the coil. Additionally, the winding is mounted with an iron center, further focusing the generated magnetic field. When passing current through a coil of wire with an iron core center, a strong magnetic field is generated. Once we have a magnetic field generated by the electromagnet, the permanent magnet reacts to it. The amount of attracting or repelling force generated by the magnets matches the two magnets’ strength.

  • Where are servo motors used?

    Servo motors deliver superb acceleration and are valued for their first-rate performance, reliability and efficiency. Servo motors are used in any application requiring smoothness, precision, repeatability and dependability.

    Servo motors don’t just have special application in CNC machinery, robotics and automated manufacturing; these motors are used in antenna positioning devices, cameras, conveyor belts, door openers and in many other business and consumer products and applications. FANUC servo motors are used worldwide and have earned a reputation for their consistently high level of build quality, producing exceptional performance with extraordinary efficiency.