{"id":7706,"date":"2025-11-03T13:27:22","date_gmt":"2025-11-03T06:27:22","guid":{"rendered":"https:\/\/songnguyen.vn\/?p=7706"},"modified":"2025-11-03T14:37:18","modified_gmt":"2025-11-03T07:37:18","slug":"servo-motors-common-faults-analysis","status":"publish","type":"post","link":"https:\/\/songnguyen.vn\/en\/servo-motors-common-faults-analysis\/","title":{"rendered":"Servo Motors Common Faults Analysis"},"content":{"rendered":"<p>During industrial production, mechanical equipment is often affected by various environmental and operating conditions. As a result, servo motors can encounter several common issues.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6412 size-full\" src=\"https:\/\/songnguyen.vn\/wp-content\/uploads\/2025\/10\/yaskawa-ac-servo-set-sigma-7.png\" alt=\"Yaskawa Sigma-7 Servo System\" width=\"1000\" height=\"776\" srcset=\"https:\/\/songnguyen.vn\/wp-content\/uploads\/2025\/10\/yaskawa-ac-servo-set-sigma-7.png 1000w, https:\/\/songnguyen.vn\/wp-content\/uploads\/2025\/10\/yaskawa-ac-servo-set-sigma-7-300x233.png 300w, https:\/\/songnguyen.vn\/wp-content\/uploads\/2025\/10\/yaskawa-ac-servo-set-sigma-7-768x596.png 768w, https:\/\/songnguyen.vn\/wp-content\/uploads\/2025\/10\/yaskawa-ac-servo-set-sigma-7-600x466.png 600w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p>Below, Song Nguyen shares some frequently observed servo motor faults along with their causes and corrective actions.<\/p>\n<h2>6 Common Servo Motor Issues<\/h2>\n<h3>Abnormal Motion<\/h3>\n<p>This issue typically occurs during feeding or cutting operations, often due to unstable speed feedback signals, such as:<\/p>\n<ul>\n<li>Cracked or damaged encoder.<\/li>\n<li>Poor electrical contact at connectors or loose screws.<\/li>\n<\/ul>\n<p>If the problem appears when the motor changes direction (forward \u2194 reverse), the common causes include:<\/p>\n<ul>\n<li>Excessive mechanical backlash in the drive system.<\/li>\n<li>Servo controller gain set too high, causing instability.<\/li>\n<\/ul>\n<h3>Creeping<\/h3>\n<p>Usually occurs during start-up, acceleration, or low-speed operation. Common causes:<\/p>\n<ul>\n<li>Poor lubrication in the transmission mechanism (ball screw, linear guide).<\/li>\n<li>Low servo gain, causing slow response.<\/li>\n<li>External mechanical load is too high.<\/li>\n<\/ul>\n<p><strong>Important note:<\/strong><\/p>\n<p>If the coupling between the servo motor and the ball screw is loose or cracked, synchronization between the two shafts will be lost, leading to speed oscillation (intermittent fast\u2013slow motion).<\/p>\n<h3>Vibration<\/h3>\n<p>When operating at high speeds, vibration may occur, sometimes accompanied by an overcurrent alarm.<\/p>\n<p>Main causes include:<\/p>\n<ul>\n<li>Improper speed loop parameters, leading to instability and mechanical oscillation.<\/li>\n<li>Bearing wear at the front or rear of the motor, causing shaft imbalance.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7686 size-full\" src=\"https:\/\/songnguyen.vn\/wp-content\/uploads\/2025\/11\/hien-tuong-rung-servo.png\" alt=\"\" width=\"640\" height=\"480\" srcset=\"https:\/\/songnguyen.vn\/wp-content\/uploads\/2025\/11\/hien-tuong-rung-servo.png 640w, https:\/\/songnguyen.vn\/wp-content\/uploads\/2025\/11\/hien-tuong-rung-servo-300x225.png 300w, https:\/\/songnguyen.vn\/wp-content\/uploads\/2025\/11\/hien-tuong-rung-servo-600x450.png 600w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/p>\n<h3>Torque Reduction<\/h3>\n<p>When the motor transitions from stall torque (at standstill) to high-speed operation, a sudden drop in output torque may occur.<\/p>\n<p>Primary causes:<\/p>\n<ul>\n<li>Reduced heat dissipation efficiency of motor windings.<\/li>\n<li>High temperature buildup in mechanical components.<\/li>\n<\/ul>\n<p>At high speeds, winding temperature increases rapidly. Therefore, always check and confirm load suitability before long-term high-speed operation.<\/p>\n<h3>Position Error<\/h3>\n<p>Occurs when the servo shaft moves beyond the set position tolerance.<\/p>\n<p>Common causes:<\/p>\n<ul>\n<li>Position tolerance limit set too tight.<\/li>\n<li>Incorrect servo parameters.<\/li>\n<li>Contaminated or damaged encoder.<\/li>\n<li>Accumulated mechanical backlash in the transmission chain.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7684 size-full\" src=\"https:\/\/songnguyen.vn\/wp-content\/uploads\/2025\/11\/hien-tuong-sai-lenh-vi-tri-servo.png\" alt=\"\" width=\"640\" height=\"480\" srcset=\"https:\/\/songnguyen.vn\/wp-content\/uploads\/2025\/11\/hien-tuong-sai-lenh-vi-tri-servo.png 640w, https:\/\/songnguyen.vn\/wp-content\/uploads\/2025\/11\/hien-tuong-sai-lenh-vi-tri-servo-300x225.png 300w, https:\/\/songnguyen.vn\/wp-content\/uploads\/2025\/11\/hien-tuong-sai-lenh-vi-tri-servo-600x450.png 600w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/p>\n<h3>Non-Rotation<\/h3>\n<p>In addition to pulse and direction signals, the control system must also send a Servo ON (enable) signal to the drive.<\/p>\n<p>If the motor does not rotate, check the following steps:<\/p>\n<ul>\n<li>Verify that the control system outputs pulse and direction signals.<\/li>\n<li>Check the control wiring connections.<\/li>\n<li>Observe the I\/O status on the driver display for confirmation.<\/li>\n<li>Check the electromagnetic brake \u2014 ensure it is released and not holding the shaft.<\/li>\n<li>Inspect both the driver and motor for hardware faults.<\/li>\n<li>Check the coupling between the servo and the ball screw \u2014 the key may have slipped, or there may be mechanical damage.<\/li>\n<\/ul>\n<p>Servo motor faults can originate from electrical, mechanical, or control software issues. Accurate root-cause analysis and regular preventive maintenance are key to maintaining the precision, reliability, and lifespan of servo systems in modern industrial production.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>During industrial production, mechanical equipment is often affected by various environmental and operating conditions. As a result, servo motors can encounter several common issues. Below, Song Nguyen shares some frequently observed servo motor faults along with their causes and corrective actions. 6 Common Servo Motor Issues Abnormal Motion This issue typically occurs during feeding or [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":7690,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[112,113],"tags":[],"class_list":["post-7706","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-information-en","category-technical-instructions-en"],"acf":[],"_links":{"self":[{"href":"https:\/\/songnguyen.vn\/en\/wp-json\/wp\/v2\/posts\/7706","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/songnguyen.vn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/songnguyen.vn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/songnguyen.vn\/en\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/songnguyen.vn\/en\/wp-json\/wp\/v2\/comments?post=7706"}],"version-history":[{"count":2,"href":"https:\/\/songnguyen.vn\/en\/wp-json\/wp\/v2\/posts\/7706\/revisions"}],"predecessor-version":[{"id":7708,"href":"https:\/\/songnguyen.vn\/en\/wp-json\/wp\/v2\/posts\/7706\/revisions\/7708"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/songnguyen.vn\/en\/wp-json\/wp\/v2\/media\/7690"}],"wp:attachment":[{"href":"https:\/\/songnguyen.vn\/en\/wp-json\/wp\/v2\/media?parent=7706"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/songnguyen.vn\/en\/wp-json\/wp\/v2\/categories?post=7706"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/songnguyen.vn\/en\/wp-json\/wp\/v2\/tags?post=7706"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}