{"id":9081,"date":"2026-04-06T11:49:48","date_gmt":"2026-04-06T02:49:48","guid":{"rendered":"https:\/\/cik-ele.com\/?p=9081"},"modified":"2026-04-06T19:31:32","modified_gmt":"2026-04-06T10:31:32","slug":"unusual-noises-from-motors","status":"publish","type":"post","link":"https:\/\/cik-ele.com\/en\/column\/unusual-noises-from-motors\/","title":{"rendered":"Causes of Motor Noise, Countermeasures by Type, and How to Choose Low-Vibration Motors"},"content":{"rendered":"<p>In manufacturing facilities and equipment operations, sudden abnormal noises from motors can lead to serious issues such as equipment shutdowns and product defects. These noises vary widely\u2014including &#8220;squeaking,&#8221; &#8220;grinding,&#8221; and &#8220;hissing&#8221;\u2014and each has a different cause. Sources range from mechanical factors like bearing wear, insufficient lubrication, and debris ingress to electrical noise.<\/p>\n<p>In this article, we will explain the main causes of motor noise by type and introduce specific countermeasures. Furthermore, for engineers considering the purchase of new motors, we will provide a detailed explanation of the characteristics of coreless motors\u2014which help prevent noise issues before they occur\u2014as well as their advantages in terms of low vibration and low noise.<\/p>\n<table style=\"height: 48px; border-color: #2470c7; background-color: #f0fdff;\" border=\"6\" width=\"551\">\n<caption>\u00a0<\/caption>\n<tbody>\n<tr style=\"height: 38.4141px;\">\n<td style=\"width: 541.504px; height: 38.4141px;\"><strong><span style=\"text-decoration: underline;\">Supervised by: C.I. TAKIRON Corporation Electronic Devices Sales Group<\/span><\/strong><\/p>\n<p><span style=\"font-family: inherit; font-size: inherit;\"><span style=\"font-family: georgia, palatino, serif;\">This article has been supervised based on the advanced technical expertise and insights we have cultivated since our founding in 1919 as a leading company in plastic processing. Our department continuously analyzes market trends and the latest technologies in ultra-compact, high-precision micro motors, focusing on providing high-value-added information to designers and developers. As a team of experts with in-depth knowledge of product characteristics, we support our customers\u2019 problem-solving and technological innovation by delivering accurate and practical content.<\/span><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2 style=\"color: #fff; background: #437ae8; line-height: 70px; font-size: 30px; margin: 10; padding-left: 1em; padding: 1em;\">Main Causes and Mechanisms of Motor Noise<\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-medium wp-image-9086\" src=\"https:\/\/cik-ele.com\/wp-content\/uploads\/2026\/04\/5bd867a9f6c11cc30111c6523d5fba94-540x360.jpg\" alt=\"Causes of Motor Noise, Countermeasures by Type, and How to Choose Low-Vibration Motors\" width=\"540\" height=\"360\" \/><\/p>\n<p>There are three main causes of abnormal motor noise.<\/p>\n<p><strong>Topics covered in this section<\/strong><\/p>\n<ul>\n<li>Bearing issues are the most common<\/li>\n<li>Noise caused by electrical interference<\/li>\n<li>Noises caused by mechanical friction and vibration<\/li>\n<\/ul>\n<p>These factors can act individually or in combination to produce various types of abnormal noises. By accurately identifying the cause, you can take appropriate corrective measures.<\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"color: #fff; background: #c3effa; line-height: 20px; font-size: 23px; margin: 10; padding-left: 1em; padding: 1em;\"><span style=\"color: #000000; font-size: 18pt;\">Bearing Issues Are the Most Common<\/span><\/h3>\n<p>Bearing issues are a frequent cause of abnormal noises in motors. Bearings play a crucial role in supporting rotating parts in the correct position. Abnormal noises and vibrations can occur due to improper bearing assembly or installation, insufficient or excessive lubricant, wear on the metal balls, or the ingress of debris.<\/p>\n<p>If bearing problems are left unaddressed, they can ultimately lead to motor burnout. Prevent problems before they occur through regular inspections and grease replenishment.<\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"color: #fff; background: #c3effa; line-height: 20px; font-size: 23px; margin: 10; padding-left: 1em; padding: 1em;\"><span style=\"color: #000000; font-size: 18pt;\">Abnormal Noises Caused by Electrical Noise<\/span><\/h3>\n<p>In DC motors, sparks generated by friction between the brushes and the commutator may be audible as electrical noise. As brush wear progresses, the sparks during commutation become larger, and the noise increases. The following measures are effective.<\/p>\n<p>[<strong>Countermeasures for Electrical Noise<\/strong>]<\/p>\n<ul>\n<li>\u00a0Regular replacement of brushes<\/li>\n<li>\u00a0Commutator maintenance and dressing<\/li>\n<li>\u00a0Adjusting brush pressure<\/li>\n<\/ul>\n<p>Unlike mechanical noise, electrical noise manifests as high-frequency interference, so it is important to be able to distinguish between the two.<\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"color: #fff; background: #c3effa; line-height: 20px; font-size: 23px; margin: 10; padding-left: 1em; padding: 1em;\"><span style=\"color: #000000; font-size: 18pt;\">Abnormal Noises Caused by Mechanical Friction and Vibration<\/span><\/h3>\n<p>Wear on the shaft, housing, or brackets can destabilize the bearings, causing abnormal vibrations and noises. Additionally, contact between the rotor and stator, friction between components, and resonance-induced humming are also causes of mechanical noise.<\/p>\n<p>Since abnormal noises caused by mechanical factors are also influenced by the overall precision and installation condition of the equipment, a comprehensive inspection is necessary that includes not only the motor itself but also the surrounding components.<\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"color: #fff; background: #437ae8; line-height: 70px; font-size: 30px; margin: 10; padding-left: 1em; padding: 1em;\">List of Noise Types, Causes, and Countermeasures*<\/h2>\n<p>*This information applies to general motors and does not specifically pertain to our company\u2019s motors.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-medium wp-image-9088\" src=\"https:\/\/cik-ele.com\/wp-content\/uploads\/2026\/04\/8df4c7fb311df6b2653b3f7b0bf89a97-540x360.jpg\" alt=\"Causes of Motor Noise, Countermeasures by Type, and How to Choose Low-Vibration Motors\" width=\"540\" height=\"360\" \/><\/p>\n<p>The cause of abnormal noises generated by a motor can be estimated based on the characteristics of the sound.<\/p>\n<p><strong>Contents Explained in This Section<\/strong><\/p>\n<ul>\n<li>High-pitched noises: &#8220;Squeaking, whining&#8221;<\/li>\n<li>Heavy noises such as &#8220;rumbling&#8221; or &#8220;grinding&#8221;<\/li>\n<li>Intermittent noises: &#8220;hissing&#8221;<\/li>\n<\/ul>\n<p>Early detection and prompt action can prevent serious failures before they occur. Below, we explain typical noise patterns commonly encountered in the field and the corresponding countermeasures.<\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"color: #fff; background: #c3effa; line-height: 20px; font-size: 23px; margin: 10; padding-left: 1em; padding: 1em;\"><span style=\"color: #000000; font-size: 18pt;\">High-pitched noises: &#8220;Squeaking&#8221; and &#8220;Shrieking&#8221;<\/span><\/h3>\n<p>These noises are characterized by a grinding sound between metal parts or a high-pitched sound. The main causes and countermeasures are summarized in the table below.<\/p>\n<div style=\"overflow-x: auto;\">\n<table style=\"width: 100%; max-width: 100%; border-collapse: collapse;\">\n<tbody>\n<tr style=\"height: 23px;\">\n<td style=\"width: 25.0023%; background-color: #f0fff8; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 23px;\"><strong>Cause<\/strong><\/td>\n<td style=\"width: 18.9977%; background-color: #f0fff8; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 23px;\"><b><strong>Countermeasures<\/strong><\/b><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 25.0023%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 28px;\">Seizing between the roller bearing and flange surface<\/td>\n<td style=\"width: 18.9977%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 28px;\"><span style=\"font-family: inherit; font-size: inherit;\">Prevent excessive loading<\/span><\/td>\n<\/tr>\n<tr style=\"height: 23px;\">\n<td style=\"width: 25.0023%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 23px;\">Insufficient internal clearance<\/td>\n<td style=\"width: 18.9977%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 23px;\">Check the precision of the shaft and bearing<\/td>\n<\/tr>\n<tr style=\"height: 23px;\">\n<td style=\"width: 25.0023%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 23px;\">Contaminant Ingress<\/td>\n<td style=\"width: 18.9977%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 23px;\">Reinforcing Seals<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>High-pitched noises indicate metal-to-metal contact inside the bearing. If left unaddressed, component damage will progress rapidly, so take immediate action as soon as you detect it.<\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"color: #fff; background: #c3effa; line-height: 20px; font-size: 23px; margin: 10; padding-left: 1em; padding: 1em;\"><span style=\"color: #000000; font-size: 18pt;\">Heavy, rumbling or grinding noises<\/span><\/h3>\n<p>This noise sounds like a rumbling in large bearings and a grinding in small bearings. The main causes are scratches on the raceway surfaces or on the balls and rollers, as well as deformation caused by debris. Countermeasures include preventing debris ingress, preventing excessive loads, and checking for vibration.<\/p>\n<p>Since this noise indicates damage to internal components, quantitative diagnosis using a vibration meter is also effective.<\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"color: #fff; background: #c3effa; line-height: 20px; font-size: 23px; margin: 10; padding-left: 1em; padding: 1em;\"><span style=\"color: #000000; font-size: 18pt;\">Intermittent &#8220;hissing&#8221; noise<\/span><\/h3>\n<p>This is a noise that occurs intermittently in a regular pattern. Possible causes include contact within the labyrinth section, contact between the retainer and the seal, or roughness on the raceway surface.<\/p>\n<p>[<strong>Points to Note for Small Bearings<\/strong>]<\/p>\n<ul>\n<li>\u00a0Roughness of the raceway surface<\/li>\n<li>\u00a0Deterioration of ball or roller surfaces<\/li>\n<\/ul>\n<p>Intermittent noises often occur in sync with the rotation cycle; checking for changes in the noise by varying the rotational speed can help identify the cause.<\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"color: #fff; background: #437ae8; line-height: 70px; font-size: 30px; margin: 10; padding-left: 1em; padding: 1em;\">Coreless Motors That Prevent Noise Problems Before They Occur<\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-medium wp-image-9090\" src=\"https:\/\/cik-ele.com\/wp-content\/uploads\/2026\/04\/0b66443b77a6fbd9c557fa2dcc22e63f-540x360.jpg\" alt=\"Causes of Motor Noise, Countermeasures by Type, and How to Choose Low-Vibration Motors\" width=\"540\" height=\"360\" \/><\/p>\n<p>To reduce the risk of abnormal noise issues in motors, it is effective to select motors with low-vibration and low-noise characteristics from the design stage.<\/p>\n<p><strong>Contents of this section<\/strong><\/p>\n<ul>\n<li>Why Coreless Motors Can Suppress Noise<\/li>\n<li>High Reliability in the Medical and Precision Equipment Sectors<\/li>\n<li>Customization Options for the Optimal Motor<\/li>\n<\/ul>\n<p>C.I. Takiron\u2019s coreless motors feature a structure without an iron core, eliminating cogging (stuttering during rotation) and enabling smooth, quiet operation. They are a strong option for reducing the risk of abnormal noise.<\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"color: #fff; background: #c3effa; line-height: 20px; font-size: 23px; margin: 10; padding-left: 1em; padding: 1em;\"><span style=\"color: #000000; font-size: 18pt;\">Why Coreless Motors Reduce Noise<\/span><\/h3>\n<p>Because coreless motors lack an iron core in the rotor, there is no repeated attraction and repulsion with the magnets. The following table compares them with conventional motors.<\/p>\n<div style=\"overflow-x: auto;\">\n<table style=\"width: 100%; max-width: 100%; border-collapse: collapse;\">\n<tbody>\n<tr style=\"height: 23px;\">\n<td style=\"width: 18%; background-color: #f0fff8; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 23px;\"><strong>Item<\/strong><\/td>\n<td style=\"width: 29.2536%; background-color: #f0fff8; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 23px;\"><strong>Conventional motor (with iron core)<\/strong><\/td>\n<td style=\"width: 30.7464%; background-color: #f0fff8; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 23px;\"><b><strong>Core-less motor (without iron core)<\/strong><\/b><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 18%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 28px;\">Cogging<\/td>\n<td style=\"width: 29.2536%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 28px;\">\u00a0Occurs<\/td>\n<td style=\"width: 30.7464%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 28px;\">\u00a0Does not occur<\/td>\n<\/tr>\n<tr style=\"height: 23px;\">\n<td style=\"width: 18%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 23px;\">Smoothness of rotation<\/td>\n<td style=\"width: 29.2536%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 23px;\">\u00a0Uneven rotation<\/td>\n<td style=\"width: 30.7464%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 23px;\">\u00a0Extremely smooth<\/td>\n<\/tr>\n<tr style=\"height: 32px;\">\n<td style=\"width: 18%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 32px;\">Vibration level<\/td>\n<td style=\"width: 29.2536%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 32px;\">\u00a0Relatively high<\/td>\n<td style=\"width: 30.7464%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 32px;\">\u00a0Extremely low<\/td>\n<\/tr>\n<tr style=\"height: 23px;\">\n<td style=\"width: 18%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 23px;\">Bearing load<\/td>\n<td style=\"width: 29.2536%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 23px;\">\u00a0High<\/td>\n<td style=\"width: 30.7464%; background-color: #ffffff; padding-top: 2px; padding-bottom: 4px; border: 1px solid #999999; height: 23px;\">\u00a0Low<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Since there is no cogging, smooth and quiet rotation is achieved, and no mechanical jamming occurs. This makes it easier to control fluctuations in bearing load, which also helps reduce the risk of abnormal noise over the long term.<\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"color: #fff; background: #c3effa; line-height: 20px; font-size: 23px; margin: 10; padding-left: 1em; padding: 1em;\"><span style=\"color: #000000; font-size: 18pt;\">High Reliability in the Medical and Precision Equipment Sectors<\/span><\/h3>\n<p>C.I. Takiron\u2019s coreless motors are widely adopted in medical devices where patient safety is the top priority, as well as in optical equipment that requires high precision. Specific application examples are as follows.<\/p>\n<p><strong>\u00a0[Proven Applications]<\/strong><\/p>\n<ul>\n<li>\u00a0Endoscope drive mechanisms<\/li>\n<li>\u00a0Medical pumps<\/li>\n<li>\u00a0Camera shutter actuators<\/li>\n<li>\u00a0Precision measuring instruments<\/li>\n<\/ul>\n<p>In applications where even the slightest vibration or noise is unacceptable, our motors are highly regarded for their cogging-free and low-vibration characteristics. Through domestic design and a rigorous quality control system, we provide highly reliable motors.<\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"color: #fff; background: #c3effa; line-height: 20px; font-size: 23px; margin: 10; padding-left: 1em; padding: 1em;\"><span style=\"color: #000000; font-size: 18pt;\">Custom Solutions for the Optimal Motor<\/span><\/h3>\n<p>At C.I. Takiron, we offer custom designs tailored to your specific applications and operating environments. Even if your desired specifications are not yet clear, we provide support from the development stage, working through sample provision and evaluation feedback to deliver the optimal product. We offer comprehensive support, ranging from technical consultations\u2014including solutions for noise reduction\u2014to small-lot prototyping and mass production.<\/p>\n<p>If you are experiencing issues with motor noise, please feel free to contact us. Our technical staff will discuss your application and requirements with you and propose the optimal solution.<\/p>\n<p>&nbsp;<\/p>\n<h2 style=\"color: #fff; background: #437ae8; line-height: 70px; font-size: 30px; margin: 10; padding-left: 1em; padding: 1em;\">Summary<\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-medium wp-image-9092\" src=\"https:\/\/cik-ele.com\/wp-content\/uploads\/2026\/04\/c7887a92414f854a9067849a51b9bb02-4-540x360.jpg\" alt=\"Causes of Motor Noise, Countermeasures by Type, and How to Choose Low-Vibration Motors\" width=\"540\" height=\"360\" \/><\/p>\n<p>Motor noise is primarily caused by bearing wear, insufficient lubrication, or the ingress of debris, and the underlying mechanism varies depending on the type of noise. When purchasing new motors, selecting low-vibration, low-noise models is an effective way to reduce the risk of noise-related issues.<\/p>\n<p>C.I. Takiron\u2019s coreless motors achieve smooth, cogging-free rotation and boast high reliability in the medical and precision equipment sectors. If you are facing issues with noise or motor selection, please consult our expert staff.<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"text-decoration: underline;\">Product Information &amp; Inquiries<\/span><\/p>\n<p>For more details on C.I. Takiron\u2019s micro motor products, please visit the website below.<\/p>\n<ul>\n<li><strong> Product Site:<\/strong><a href=\"https:\/\/cik-ele.com\/en\/\"> https:\/\/cik-ele.com\/en\/<\/a><\/li>\n<li><strong> Coreless Motors:<\/strong><a href=\"\/?list=coreless_motor\"> https:\/\/cik-ele.com\/en\/products\/list\/coreless_motor\/<\/a><\/li>\n<li><strong> Brushless Motors:<\/strong><a href=\"\/?list=brushless_motor\"> https:\/\/cik-ele.com\/en\/products\/list\/brushless_motor\/<\/a><\/li>\n<li><strong> Geared Motors:<\/strong><a href=\"https:\/\/cik-ele.com\/en\/products\/list\/gearheads-en\/\"> https:\/\/cik-ele.com\/en\/products\/list\/gearhead\/<\/a><\/li>\n<li><strong> Encoders:<\/strong><a href=\"https:\/\/cik-ele.com\/en\/products\/list\/encoders-en\/\"> https:\/\/cik-ele.com\/en\/products\/list\/encoder\/<\/a><\/li>\n<\/ul>\n<p>If you are having trouble selecting a small motor for your product development, please feel free to contact us via the inquiry form. Our technical staff will discuss your application and requirements with you and propose the optimal solution.<\/p>\n<ul>\n<li><strong> Inquiries:<\/strong><a href=\"https:\/\/cik-ele.com\/en\/contact\/\"> https:\/\/cik-ele.com\/en\/contact\/<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>In manufacturing facilities and equipment operations, sudden abnormal noises from motors can lead to serious issues such as equipment shutdowns and product defects. These noises vary widely\u2014including &#8220;squeaking,&#8221; &#8220;grinding,&#8221; and &#8220;hissing&#8221;\u2014and each has a different cause. Sources range from mechanical factors like bearing wear, insufficient lubrication, and debris ingress to electrical noise. In this article, we will explain the main causes of motor noise by type and introduce specific countermeasures. Furthermore, for engineers considering the purchase of new motors, we will provide a detailed explanation of the characteristics of coreless motors\u2014which help prevent noise issues before they occur\u2014as well as their advantages in terms of low vibration and low noise. \u00a0 Supervised by: C.I. TAKIRON Corporation Electronic Devices Sales Group&#8230;<\/p>\n","protected":false},"author":6,"featured_media":9085,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[172],"tags":[209,210,211,213,214,215,216,217,219,220,221,238,239,240],"class_list":["post-9081","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-column","tag-energy-loss","tag-security-equipment","tag-noise","tag-maintenance","tag-optical-equipment","tag-efficiency","tag-medical-equipment","tag-lifespan","tag-heat-generation","tag-energy-saving","tag-quiet-operation","tag-brushless-motor","tag-brush-motor","tag-industrial-robot"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Causes of Motor Noise, Countermeasures by Type, and How to Choose Low-Vibration Motors\uff5cC.I. TAKIRON Corporation. Micro motor product site.<\/title>\n<meta name=\"description\" content=\"\u00a0In the development of industrial equipment, medical devices, and precision instruments, motor selection is a critical factor that determines product performance.\u00a0In recent years, interest in high-efficiency, long-life Brushless motors has grown, leading to an increasing number of engineers to consider replacing conventional Brushed motors with it. However, determining the specific differences from Brushed motors and assessing applicability to their products requires technical justification and data.\u00a0This article will seek to explain the basic structure and operating principles of Brushless motors to the detailed comparisons with Brushed motors, their advantages and disadvantages for different applications, and selection points for each industrial sector. 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