This section provides overview, applications, and principles of servo linear motors. Also, please take a look at the list of 16 servo linear motor manufacturers and their company rankings.
A linear servo motor is an electric motor that does not have a built-in shaft.
While most common motors perform the rotary-type motion, linear motors generally perform the linear-type motion. The linear motor itself is the driving device. On the other hand, a servo motor is a motor used to control position, speed, etc., in a servo mechanism.
Servo motors have been the mainstay of linear motion systems for industrial machinery and measuring instruments, but in recent years, linear servo motors move by the action of the magnetic flux generated by a permanent magnet and the current flowing through a coil (Fleming's left-hand rule), have been attracting attention.
Applications vary depending on the size and are categorized as follows.
Small diameter (Φ4-12 mm): This size is used in desktop-type equipment. Mainly used for observation of industrial products and biological and bio-related products. In fields where higher-resolution images and their image processing are necessary, shaft motors are required.
Medium shafts (up to Φ35 mm): This size is most commonly used in fields that require high thrust, high precision, and high speed, such as machine tools and semiconductors.
Large diameter (up to Φ60mm): This size is used for special machines that require high hydrostatic acceleration.
It consists of a shaft with a magnet as its axis and a mover containing a coil. It consists of a primary side with an iron core and motor coil and a secondary side with a permanent magnet and mounting plate.
The shaft is a pipe made of stainless steel with evenly spaced magnets, and the mover consists of a three-phase coil wound around the shaft. The mover does not come into contact with the shaft, and its incorporation does not affect the thrust itself, making it easy to install.
It operates by generating thrust through the action of the magnetic induction flux generated by the permanent magnet and the current flowing in the coil.
The features of motors using shafts include: high-precision positioning is possible by using a high-precision linear scale, there is no backlash, and cogging (the fine vibration of the magnetic attraction between the shaft and mover in a motor that depends on the angle of rotation) is almost non-existent because there is no core.
The absence of a core means that cogging (the fine vibrations caused by the magnetic attraction between the shaft and mover in a motor, depending on the rotation angle) is virtually non-existent.
The absence of screws, nuts, and other mechanical structures inside the motor allows for high-speed motion. While the accuracy of motion is excellent, the rigidity is low because the fixed side is not in contact with the moving side, making it unsuitable for heavy-duty cutting where resistance is high.
It is used in equipment for processing electronic components such as semiconductors and medical parts. Its small size and simple structure are advantages when incorporated into equipment.
*Including some distributors, etc.
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