![]() ![]() The higher the number of teeth increases the full-step resolution and helps to reduce vibration as the motor is moving a shorter distance with each step. High-resolution stepper motors feature a higher number of rotor teeth, for example,100 teeth instead of 50. The added silicon gel and inertia help the motor to absorb vibration and provides a reliable damping effect. This damper is fastened to the rear shaft of the motor, and consists of hermetically sealed cases made of plastic and an inertia body with silicon gel packed inside. One of the simpler ways to minimize vibration in stepper motors is to install a clean damper. First, we will go through the most used mechanical methods to reduce vibration and noise. In general, the methods can be segregated into mechanical and electrical methods, with the above example of current ripple reduction falling into the electrical category. There are many ways to reduce vibration in stepper motors. Noise and vibration reduction methods in stepper motors ![]() The two modes of decay are drive synchronous fast decay and synchronous slow decay, which can be used in combination with each other to reduce current ripple. It achieves this by implementing multiple decay modes. The controller for the motor can attempt to minimize the ripple experienced by managing how the current is decreased. ![]() The PWM current control method naturally results in current ripple, due to the inductance of the motor and voltage running across it. The first method for reducing noise and vibration in stepper motors lies within its control system. This maintains the position of the rotor by defining the ratio between the windings as mentioned previously. Utilizing this method, the controller chops the output, which limits the current in each of the two windings. The most common way to control a stepper motor is by current control, specifically pulse-width modulation (PWM). If the motor is not operating at resonance, torque ripple will be the largest source of noise and vibration from a stepper motor. Torque ripple occurs during operation when torque is not constant, and the motor can experience significant vibration and audible noise. Due to this unique setup, stepper motors can divide their position between their two poles into smaller distances called microsteps. The rotor is positioned between windings according to the current ratio between its two poles. To do this, let's break down how a stepper motor works.īipolar stepper motors are DC motors with discrete pole positions made up of many coils laid out in two groups named phases. In these and most applications, reducing the vibration of the motor itself can only be beneficial as it improves the quality of the final product produced by the machine and ensures quieter operation.īefore diving into how to solve these problems, what causes this vibration and noise from stepper motors must first be identified. The same concept applies to 3D printing, where high torque ripple or motor resonance can lead to printing “artifacts” in the form of unwanted extra material on the printed object. When these motors are used in CCTV, vibration caused by the zooming and panning of the camera can cause movement in the gimbal and image sensor, leading to distorted images and less than desirable performance. Successful operation depends on the effective and efficient management of the noise and vibration generated by stepper motors. If we are silent, people take note and we gain their attention.While a wide range of industries utilize stepper motors, these systems can be prone to common issues with current distortion and torque ripple. The same is true in our daily conversations. All of the sudden you pay attention to try and figure out why communication has stopped. When the speaker stops talking a signal goes to the brain that something has happened. If the teacher or presenter is talking away the listeners’ minds might start to wander. If you have ever been in a classroom or in a group situation you have most likely experienced how silence often gets everyone’s attention. Read on for more reasons to try silence in your daily communications. There are quite a few of us who need to learn the art of practicing silence. These fortunate individuals know the power of silence and they are comfortable in that silence. Often the other person would offer more information or would quickly get the answer he or she needed in the silence that met the question.Īccording to Carolyn Ellis, “ When used with intention and purpose, silence is a communication superpower.”įor some people, silence comes naturally. ![]() Recently, I was reading a Jack Reacher novel and I noticed how many times in a conversation he would answer with silence. ![]()
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