Noise test comparison
Another common complaint about open-loop stepping systems is that they generate considerable audible noise. In some environments, such as laboratories, hospitals, and offices, this noise can cause real problems for machine designers.
The noise emitted by the stepper motor results from high frequency and rapid flux changes in the stator teeth, and because the open loop system operates at full rated current regardless of the load. On the other hand, a closed-loop stepping system provides enough current to the motor to control the load, resulting in less audible noise.
Shown here is the audible noise, which corresponds to the speed of the open loop system and the StepSERVO closed loop system. The closed-loop stepping system provides enough current to the motor to control the load, which results in much less audible noise than the open-loop setting.
To produce the test results shown in the acoustic noise map attached to this paper, the acoustic noise of each system is measured in a soundproof chamber. The closed loop system is much quieter than the open loop option, with speeds from 0 to 20 rpm. This speed range is consistent with the actual speed range of applications most commonly used with stepper motor systems, which means that most stepper motor applications can benefit from reduced motor noise if switched to a closed loop system.
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