From it: Automotive Applications For Noise Vibration And Vibration
| THE CAUSE AND EFFECT OF BULLYING | 6 days ago · Reducing audible noise and vibration enhances nearly every motor control application, from home automation door locks and valve control to precision vision systems and 3D printing. Allegro’s QuietStep technology removes the hassle of trying to determine the source of noise and vibration . Our sound & vibration platforms have been strengthened with improvements based on your feedback to strengthen your measurement processes and support your preferred way of working. Read more Product Noise Partner for B&K SLM released Test product noise levels with confidence with the Product Noise Partner for B&K Never before have automotive engineers been so challenged by developments in vehicle architecture and powertrain technology. Optimal noise, vibration and harshness (NVH) is now a top priority to ensure product performance, driving comfort and unique brand identity. |
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Automotive Applications For Noise Vibration And Vibration - casually
A motor vibration method and a motor vibration device are provided. The method combines a traditional vibration reminding effect and a sound reminding effect provided by adding the medium- and high-frequency signal, thereby enhancing the reminding efficiency by means of motor vibration and increasing the successful rate of message delivery. The present disclosure relates to the field of electronic devices, in particular to a motor vibration method, a motor vibration device, a computer device, and a computer-readable storage medium. The continuous development of mobile communication and electronics technology has led to a wide application and popularization of portable electronic devices such as smartphones. When one of such portable electronic devices, such as the smartphone, is used, it is necessary to send messages and to remind the user of new messages. Automotive Applications For Noise Vibration And VibrationAutomotive Applications For Noise Vibration And Vibration Video
NVH App Usage - Step 4 Noise Vibration Harshness Auto Repair Diagnosis Tool
A bipolar stepper provides accurate open loop position as well as zero-speed torque without using a control loop or external sensors. Successful deployment of stepper motors requires effective management of noise and vibration.
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In CCTV applications, for example, vibration translates directly to the image sensor and gimbal. Large zoom combined with movement can distort the image. In 3D printing, motor resonance or overshoot caused by high torque ripple can result in many unwanted printing artifacts. In most cases, reducing motor vibration results in better image quality or more precise 3D printing.
Reducing motor vibration also enables quieter overall operation. Advanced technologies based on proprietary algorithms are now available to minimize noise and vibration in stepper motor more info by reducing torque ripple and current distortion.
A bipolar stepper motor is a DC motor with discrete pole positions constructed of multiple coils arranged in two groups called phases. The current ratio between the two phases determines how the rotor is positioned between the two windings.
Minimizing Stepper Motor Noise and Vibration in Precision Motion Control Applications
In this way, a stepper motor can divide its position between two poles into smaller increments called microsteps. The current in each stepper motor winding can be summed to create a vector where the magnitude of the vector is the torque. By examining the current in each of the two phases in polar space, we can visualize the vector as it rotates through each electrical cycle. In the time-based domain Figure 1 leftthe torque is defined as the sum of the area under the two curves. In the polar domain Figure 1 rightthe magnitude of the vector is the torque. In these images, we can see that the torque is constant as the field moves through each electrical cycle. When torque is not constant, the system experiences vibration and audible noise. Assuming the motor is not operating at resonance, torque ripple becomes the biggest source of audible noise and vibration in a stepper motor.
Pulse-width modulation PWM current control is the most common way to drive a stepper. By implementing current control, the controller PWM chops the output, limiting the current in each winding to maintain a ratio that defines the rotor position. The nature of PWM current control results in current ripple based on the applied duty cycle, the inductance of the motor and the voltage across it. To minimize ripple, the controller can manage how the current decreases in the windings by implementing Automotive Applications For Noise Vibration And Vibration decay modes.
Following the drive, shown in figure 2A, the decay mode is implemented during PWM off-time through two synchronous methods shown in figure 2B and 2C. Fast decay provides optimal current control but results in high ripple.
Figure 3A shows what can happen when using percent slow decay. Figure 3B shows the effects of using percent fast decay.]
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