How to solve the problem of motor heating
The natural extension of power consumption testing is the study of motor heating. The open loop stepping system is a simple beast. Simply set the drive for the rated motor current and the drive will try to supply the motor with current, regardless of the torque required. This usually results in the generation of heat rather than energy-generating application functions - which is why open-loop stepper systems are generally hotter than closed-loop counterparts. This also means that the machine designer must take extra measures to deal with this heat, usually including special protection around the stepper motor running near the human operator, or installing an additional cooling system such as a fan.
Consider the results of a motor heating test conducted in the laboratory using the same open-loop and closed-loop systems as described above. In this test, the two systems again produced the same amount of work to drive the same inertial load and allowed them to run until they reached thermal equilibrium. The open-loop system's case temperature reached 76.0 ° C, while the closed-loop system reached thermal equilibrium at a temperature of only 36.9 ° C - less than half of the open-loop system. A significant reduction in motor heating means that the machine builder's component costs are reduced because they can omit additional guard and cooling subsystems.
This is a comparison of the laboratory test temperatures of the StepSERVO closed loop system and the open loop system. It shows the results of a motor heating test using the same open-loop and closed-loop systems as the other tests detailed herein.
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