hi as u may know when u buy a dc motor usually there is no specific information about its electrical and mechanical specifications and i want to know how to build a device that can give all the information (Constant factor K , nominal voltage , torque ,etc ) about the motor specially motors under 0.5hp
Hi kiarash,
There are jigs that can be made with various sensors to collect those informations.
We are unable to suggest parts for this, as it depend on the way you implement them, but you might be able to find some on our store.
Some interesting links:
Force Sensors
Current & Voltage Sensors
Optical RPM Sensor
I know this is an old thread. But, some aspects of it relate to some other work I am doing, so I thought I would add a bit. I think that some of the measurements are achievable, but some cannot. For example, it is easy to measure the current at stall. But, its real power rating is determined by how fast it can dump heat. Also, its max voltage is determined by the insulation on the internal coils. Perhaps familiarity with similar motors can provide for an educated guess, but it is still a guess. If the motor is not typical, and your guess is near the threshold of what the motor is capable of, it may test OK at that voltage, but not prove reliable in the field.
Also, I recently learned from a manufacturer that the same motor line can be wound in different ways to optimize it for a lower speed. The more I learn about motors, the more I realize that I don’t know about them.
Another recent lesson, is that my Sabertooth 2x32 Motor Controller does not provide an accurate current measurement for the motor, even when run at 100%, so that there should be no PWM signal to contend with.
Anyway, there are some fairly standard ways to measure torque, a “prony brake” is one.
youtube.com/watch?v=u9vhGwwawQ8
-Joe