Blog Archives

Magnetic Encoders VS Optical Encoders

Encoders, whether rotary or linear, absolute or incremental, typically use one of two measuring principles—optical or magnetic. While optical encoders were, in the past, the primary choice for high resolution applications, improvements in magnetic encoder technology now allow them to

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Posted in Robotics, Sensors

Complementary Encoder Signals to mitigate the electrical noise

Electrical noise is a common problem that occurs during the transmission of an incremental encoder’s signal to the receiving electronics, especially when the cable lengths are very long. Stray electromagnetic fields or currents induce unwanted voltages into the signal. These

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Posted in Actuators, Robotics, Sensors

Optical Encoders in Brushless Servo Motors

The trend towards wide scale use of Brushless Motors is being driven by manufacturing cost reductions, improved efficiencies, greater reliability, availability of improved drive electronics, and the availability of improved sensors for motor control. The brushless motors, independently whether they

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Posted in Actuators, Robotics

A good robotic blog

One of my mates is developing several projects related to robotics which are worth mentioning.  In his blog,  one of his last projects is the construction of an humanoid robot based on steppers.

Posted in Robotics

Backdrivability

There is a trend in robotics towards the use of backdrivable actuators due to multiple reasons. One of them, is the need of sharing the environment with humans. Such a robot needs flexibility to adapt the differences between real environmental

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Posted in Robotics

Notes on encoder resolution for velocity control of motors

The simplest velocity estimation method is the Euler approximation that takes the difference of two sampling positions divided by the sampling period. Typically the position measurements are taken with encoders or resolvers which contain stochastic errors which result in enormous

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Posted in Actuators, Robotic devices, Robotics

Motor Selection for Robots (I)

Analise the correct parameters that must be taken into account when selecting a motor is crucial for the success of the application.

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Posted in Actuators, Robotics
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