Fermentor Bioreactor Agitation Systems Below is a list of the most common specifications a DC motor manufacturer might list. For most hobbyists the basic information is enough to make an informed decision about which motor to purchase.
Nominal Voltage: The voltage that corresponds to the highest motor efficiency
No Load RPM: This is how fast (angular velocity) the final output shaft will rotate. If the motor has a gear down and the motor's speed is not indicated separately, the no load rpm value is the shaft speed after the gear down. The motor’s RPM is proportional to the voltage input. “No Load” means the motor encounters no resistance whatsoever.
Stall Torque: This is the maximum torque* a motor can hold. It is important to note that most motors will sustain damage if subjected to stall conditions for more than a few seconds.
Stall Current: This is the current the motor will draw under maximum torque* conditions.
Basic dimensions: Dimensions usually include weight, shaft length and shaft diameter as well as motor length and diameter. Other useful dimensions include the location of mounting holes and thread type.*"Torque" is calculated by multiplying a force (acting at a distance