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Using Notch Filters to Compensate for Resonance in Servo Motor Control Systems
Servo motor control systems with resonance often create difficult problems for designers because it causes the servo control system to over-shoot and oscillate.
An effective way to compensate for resonance in a servo system is the use of a notch filter in addition to the standard PID servo loop compensation. To understand the operation of a notch filter, note that every resonance is characterized by two parameters: the imaginary and the real part. The imaginary part sets the resonance frequency, whereas the real part sets the damping. The smaller the real part, the stronger the effect of the resonance.
Servo Amplifier Types - Linear and Pulse Width Modulated (PWM)
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This post describes two types of servo amplifiers used to drive DC and brushless DC servo motors: linear and pulse-width-modulated (PWM) servo amplifiers.
Linear servo amplifiers apply the full voltage across the power transistors which results in high power dissipation and higher heating. For this reason, linear servo amplifiers are typically used in applications requiring less than 100 watts or when switching cannot be tolerated in applications. PWM servo amplifiers switch the voltage across the power transistors off-and-on so that the required average voltage is achieved. This results in less power dissipation and more efficiency making PWM servo amplifiers much more common than linear amplifiers.
Minimizing Servo Motor Temperature in Optimal Design of Motor Control Systems
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The ability of a servo motor to perform the required moves within short times is limited by the temperature rise that results from the power dissipation. It follows, then, that the optimal design of a servo motor control system, which maximizes the system throughput, is the one that results in minimum servo motor temperature.
This post addresses the optimal design of a servo motor control system. It assumes a required motion of given length, and seeks the design that accomplishes the required move within a specified time, while minimizing the servo motor temperature.
Trapezoidal vs Sinusoidal Brushless Servo Amplifiers
The new Galil Sine drive amplifiers are a welcome addition to the existing DMC-40x0 and DMC-41x3 line-up of servo and stepper amplifiers - yet the addition of the new amplifiers also brings up a question - "When should I use a sinusoidal drive instead of a trapezoidal drive?". This article will
Controller-driven network data storage (Windows example)
It is often desirable to create reports or provide data collection for a Galil motion controller or PLC.