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AC Servo Drives

An AC servo driver supplies current to a servo motor and controls position, speed, and torque with high accuracy based on position and speed feedback from the encoder. It rectifies the AC input and uses an inverter circuit to output variable frequency and variable current to the motor, while running current, speed, and position control loops at high speed. Commands from the host controller are received as pulse trains, analog voltage, or field networks such as EtherCAT and PROFINET. Models include small-capacity single-phase 200 V types, low-voltage types operating on DC 24 V/48 V, and dedicated units for direct drive motors. They are used in packaging machinery, conveyors, machine tools, and semiconductor manufacturing equipment.

How to choose AC Servo Drives

  1. 1. Check the motor capacity to be combined

    Drivers are offered by motor capacity, and most are dedicated to specific motor series. Confirm that the motor model and output rating match the combination table. Some models are designed exclusively for direct drive motors, so check series compatibility as well.

  2. 2. Match rated and maximum output current to the load

    The rated output current determines continuous operation, and the maximum output current determines instantaneous torque during acceleration and deceleration. Listed products have maximum output currents ranging from 20 to 50 Arms. Calculate the required peak torque and effective torque from the operating pattern, and confirm that both current values are sufficient.

  3. 3. Match the main circuit power supply voltage and phase

    Input specifications differ by model, such as single-phase 200 to 240 V, three-phase 200 V class, and low-voltage DC 24 V/48 V types. Confirm that the facility power voltage and phase match, or whether both single-phase and three-phase are supported. Also check that the facility can supply the required power capacity (0.9 to 1.3 kVA for listed products).

  4. 4. Check the host communication standard and communication cycle

    Supported standards such as EtherCAT, PROFINET, and SV-NET are fixed for each model, and they must match the host controller. For synchronized multi-axis operation, also check whether the communication cycle (for example, 250 μs or less with PROFINET IRT) meets the control cycle requirements.

  5. 5. Pulse command input frequency and resolution

    When commanding by pulse train, calculate whether the maximum input frequency (8 to 500 kHz for listed products) satisfies the required combination of speed and resolution. The encoder position detection resolution (for example, 4,194,304 counts/rev) affects positioning accuracy and smoothness at low speed.

  6. 6. Panel installation size and safety functions

    For housing in a control panel, check the external dimensions, mass (0.8 to 21 kg for listed products), and ambient operating temperature. For equipment requiring safety standard compliance, also check whether Safe Torque Off (torque shutoff function) is built in and whether an built-in EMC filter is included.

This guide was written by AI based on the listed products' documents and specification items. Check each manufacturer's documents before adopting.