| 3A Back EMF H-Bridge Last Modified: 2008-05-01 | | |
| Acroname Robotics | PDF webpage version | ||
| More Details: This H-Bridge component is a convenient way to control motors or other high-current loads. This H-Bridge component also incorporates an Acroname-designed Back-EMF measurement circuit that allows you to actually discern the speed of the motor you are driving without an encoder! This allows you to use this component to drive motors from toys, cars, or other places where speed control was not possible before. There are three main forms of motor feedback supported with this component:
The bridge is based on the National 18200 H-Bridge chip so it has very low on resistance (0.4 Ohm), and can handle currents of 3 Amps continuously and as much as 6 Amps surge. It also has a built in 3.15 Amp fuse (easily replaced) and incorporates seperate power supply inputs for the motors. One extra fuse is included with the module. Charge-pump capacitors are also included to offer higher PWM speeds and therefore greater motor efficiency. The pinout for this H-Bridge component conforms to the Acroname H-Bridge Standard so it will work well with any device that conforms to this standard. An encoder header is built into the bridge to allow quadrature encoder inputs to be plugged directly into this bridge component and passed through to the standard header and 3.3k Ohm pullups are included.
This bridge component measures 2.5" by 1.35" and is just under 0.5" thick.
This board is ideally suited to use on the BrainStem® Moto 1.0 module. The above photo shows one 3A EMF H-Bridge installed in the Moto 1.0 module. The Moto 1.0 module will accept two of these H-Bridge boards. Acknowledgement The idea of Back-EMF feedback for motion control was originally introduced to Acroname by Randy Sargent who, along with Bill Bailey, had worked on a similar design. This method of speed control has also been popular in audio tape mechanisms for decades and is also used in modern model train controllers. |
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Related Links: NASA/CMU Summer Robot Course featuring the Acroname-powered Trikebot Driving High-Current Loads from Logic Article Articles: Back-EMF Motion Control Feedback Brainstem in Use: The University of Minnesota Mega Scout Acroname Supported H-Bridge Standard Moto 1.0 Module A/D Velocity PID Mode Description Moto 1.0 Encoder Velocity PID Mode Description Moto 1.0 Module A/D PID Mode Description BrainStem Moto 1.0 Module PWM A/D Mode Description Moto 1.0 Module PWM Mode Description Examples: Manipulating the BrainStem Moto 1.0 using the Acroname C Development Libraries Example | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| voice: 720-564-0373, email: sales@acroname.com, address: 4822 Sterling Dr., Boulder CO, 80301-2350, privacy © Copyright 1994-2008 Acroname, Inc., Boulder, Colorado. All rights reserved. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||