How Does a Direct Drive Linear Actuator Work?

22 Jan 2021
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A linear servo motor is a linear actuator that produces force and velocity based on the supplied current and voltage and provides a linear movement along the axis being driven.  In simple terms, a linear servo motor behaves identically as a rotary servo motor – it’s just rolled out flat and straight.

Bandwidth, Gain and Phase Margin in Servo Systems: What is Phase Margin?

15 Dec 2020
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Phase margin is a measurement in the frequency domain, taken from a Bode plot, that calculates the amount of phase lag above -180 degrees at the point on the amplitude plot that crosses 0dB (gain cross over frequency).

Bandwidth, Gain and Phase Margin in Servo Systems: What is Amplitude Gain Margin?

07 Dec 2020
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Amplitude gain margin is a measurement in the frequency domain, taken from a Bode plot, that takes the amplitude below 0 dB at the lowest frequency point that the phase reaches -180 degrees (phase crossover frequency).

How to Select a Servo Drive

01 Dec 2020
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A servo drive should be selected based on the specific servo motor used in the application. The motion requirements of the driven mechanism determines the voltage and current requirements of the servo motor – the key information required when selecting a servo drive.

Bandwidth, Gain and Phase Margin in Servo Systems: What is Bandwidth?

25 Nov 2020
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In simplified terms, bandwidth can be calculated as 1/(settling time) of a given step response of a servo system.

How Does a Servo Drive Work?

24 Nov 2020
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A servo drive is an electronic device that is part of a closed loop system, producing current and voltage to rotate a servo motor. The closed loop system includes the servo drive, servo motor and feedback device, and is commanded from an analog or digital signal.

Four Key Values to Determine Servo System Stability

13 Nov 2020
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A stable servo system is essential for optimal machine performance, durability, safety, and consistent machine performance, which improves overall machine operation. Servo systems operate in various degrees of stability, with a fine line between stable and unstable. Changes in the mechanical system over time or machines with varying loads can move the system from a stable to unstable operating condition. This article unveils four key values that determine the stability level of a servo system.

How to Select a Servo Motor

28 Oct 2020
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There are several considerations when selecting a servo motor for a specific application, such as the required speed, torque or force, motion profile, available physical envelope, and environmental factors. This means that the chosen motor solution must produce the load torque and speed requirements, fit in the available space, and perform as required under the subjected environmental conditions of the application.

5 Critical Items Revealed in the Bode Plot

07 Oct 2020
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Bode plots have existed since the 1930’s when Hendrik Bode devised a way to display gain and phase-shift plots in the frequency domain. Today, to produce a detailed frequency response plot that reveals the unique fingerprint of a servo mechanism in the frequency domain is as simple as pressing a computer key. This paper discusses five key items in a Bode plot and what they reveal about the machine.

How Servo Motors Work

29 Sep 2020
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A servo motor is an electromechanical device that produces torque and velocity based on the supplied current and voltage. A servo motor works as part of a closed loop system providing torque and velocity as commanded from a servo controller utilizing a feedback device to close the loop. The feedback device supplies information such as current, velocity, or position to the servo controller, which adjusts the motor action depending on the commanded parameters.

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