Made for students, by students Motor Selection Guide
Adding Sensors Based on Needs from Other Systems
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Adding Sensors Based on Needs from Other SystemsAt this point, you are well equipped to select the motor and gear system that works well at your operating point(s). However, other parts of your systems may require feedback about the actual operating condition of the motor. It is important to understand what feedback is required from the motor to allow the other subsystems perform their job well. Additional motor sensors are commonly used for measuring the motor’s speed, position, and rotational direction. However, motor temperature, torque, true voltage or current inputs (as compared to what you calculated), or other various forms of measured feedback might be required. Overall, sensor feedback is important due to the fact that few systems actually behave as predicted. For example, think about driving a car without a speedometer. The driver would be able to make the car accelerate by hitting the gas pedal but would not know the exact speed of the car. The only feedback the driver would have is an estimate of speed based on a visual observation of the trees passing by. This would be similar to the ModBot guessing at the speed of the motor based on the commanded input voltage and current, and therefore, additional sensors would be helpful. It is best to discuss what information will be beneficial and what information is essential to the operation of the robot with all members of your team. Likewise, the level of accuracy of the information must also be discussed. Before selecting a sensor to apply to the motor, a review of the options to acquire information is important. Depending on the information required, could an external sensing system eliminate the need for sensors on the motor, such as perhaps the ModBot’s external positioning system? Does the information from the external sensing system meet all of the requirements for information for your other subsystems? Are redundancies needed in the information acquisition? 
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