{"id":2405,"date":"2024-01-20T01:45:55","date_gmt":"2024-01-19T17:45:55","guid":{"rendered":"https:\/\/assunmotor.com\/blog\/?p=2405"},"modified":"2024-02-06T22:58:31","modified_gmt":"2024-02-06T14:58:31","slug":"servo-motor-vs-stepper-motor","status":"publish","type":"post","link":"https:\/\/assunmotor.com\/blog\/servo-motor-vs-stepper-motor\/","title":{"rendered":"Servo Motor Vs Stepper Motor: How to Choose For Your Project?"},"content":{"rendered":"[vc_row][vc_column][vc_column_text]<strong>Servo Motor: <\/strong>A servo motor is known as an electric motor that is used for exact control of angular or linear position, speed, and torque. It is an appropriate motor connected to a sensor for position feedback and a controller that adjusts the motor\u2019s shifting.<\/p>\n<p><strong>Applications: <\/strong>Servo motor has huge industrial applications such as robotics, CNC machinery, and automated manufacturing for its high precision, fast response, and uniform.<\/p>\n<p><strong>Stepper Motor: <\/strong>A stepper motor is a brushless, synchronous electric motor that can transform digital pulses into mechanical shaft rotation. It is known as a digital input-output instrument. It is perfect for the application if control signals are displayed as digital pulses.<\/p>\n<p><strong>Applications: <\/strong>Stepper motors have different applications robotics, machine tools, pick and place machines, automated wire cutting and wire bonding machines etc.[\/vc_column_text][vc_empty_space height=&#8221;28px&#8221;][vc_btn title=&#8221;Check out Assun Motor&#8217;s Range of Planetary Gearboxes.&#8221; color=&#8221;danger&#8221; size=&#8221;lg&#8221; align=&#8221;center&#8221; css_animation=&#8221;bounceInUp&#8221; link=&#8221;url:https%3A%2F%2Fassunmotor.com%2Fonline-shop%2Fplanetary-gearbox&#8221;][vc_empty_space height=&#8221;28px&#8221;][vc_column_text]<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/assunmotor.com\/blog\/servo-motor-vs-stepper-motor\/#Comparison_between_Servo_and_Stepper_Motor\" title=\"Comparison between Servo and Stepper Motor:\">Comparison between Servo and Stepper Motor:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/assunmotor.com\/blog\/servo-motor-vs-stepper-motor\/#Differences_between_Servo_and_Stepper_Motor_Table\" title=\"Differences between Servo and Stepper Motor (Table)\">Differences between Servo and Stepper Motor (Table)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/assunmotor.com\/blog\/servo-motor-vs-stepper-motor\/#Conclusion\" title=\"Conclusion\">Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n[\/vc_column_text][vc_empty_space height=&#8221;28px&#8221;][vc_column_text]\n<h2 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"Comparison_between_Servo_and_Stepper_Motor\"><\/span><strong>Comparison between Servo and Stepper Motor:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Servo and\u00a0stepper motors\u00a0are both useful control elements in industrial applications.\u00a0 There are some key comparisons between servo and stepper motor. It is very important to understand the comparisons between those two motors to understand which motor is useful for applications. The following is a brief description of their comparisons.<\/p>\n<ol>\n<li><strong> Motor Design: <\/strong><\/li>\n<\/ol>\n<ul>\n<li><strong> Servo Motor:<\/strong><\/li>\n<\/ul>\n<p>\u25ba Servo motor contains a rotor with 2-8 poles and a 3-phase stator.<\/p>\n<p>\u25baIt is magnetized with permanent magnets instead of magnetized axially like a stepper motor.<\/p>\n<p>\u25baLess number of poles gives the capacity to produce higher torque at higher speeds.[\/vc_column_text][vc_single_image image=&#8221;4601&#8243; img_size=&#8221;medium&#8221; alignment=&#8221;center&#8221;][vc_column_text]\n<ul>\n<li><strong>Stepper Motor: <\/strong><\/li>\n<\/ul>\n<p>\u25ba Permanent magnet is sandwiched between two teeth and used in a stepper motor design.<\/p>\n<p>\u25ba Rotor cup may include 50 or 100 teeth, and the two rotor cups are skewed at half a tooth pitch.\u00a0 Every tooth on both rotor cups becomes a pole in a stepper motor.<\/p>\n<p>\u25ba Stepper motor is able to run in open-loop without an encoder.[\/vc_column_text][vc_single_image image=&#8221;4602&#8243; img_size=&#8221;medium&#8221; alignment=&#8221;center&#8221;][vc_empty_space][vc_single_image image=&#8221;4603&#8243; img_size=&#8221;medium&#8221; alignment=&#8221;center&#8221;][vc_empty_space][vc_column_text]\n<ol start=\"2\">\n<li><strong> Stop Accuracy<\/strong>: One of the important requirements for positioning applications for both stepper motor and servo motor is stop accuracy.<\/li>\n<\/ol>\n<ul>\n<li><strong> Servo Motor: <\/strong><\/li>\n<\/ul>\n<p>\u25ba Stop accuracy of the servo meter relies on the assembly accuracy, encoder resolution, and algorithm.<\/p>\n<p>\u25ba Servo motors are &#8220;electrically designed&#8221; for positioning applications.<\/p>\n<ul>\n<li><strong>Stepper Motor:<\/strong><\/li>\n<\/ul>\n<p>\u25ba Stop accuracy of a stepper motor is largely based on the characteristics of its windings, accuracy of rotor construction, and the number of teeth\/poles in its rotor.<\/p>\n<p>\u25ba The stepper motor is designed mechanically for positioning applications.<\/p>\n<p>Both servo and stepper motors provide stop accuracy of around +\/-0.02\u00b0. \u00a0A stepper motor provides better repeatability at 7.2\u00b0 increments or almost perfect repeatability at 360\u00b0 increments. On the other hand, the servo motor\u2019s stop accuracy is dependent on its encoder resolution. The errors are shown in the following figure.[\/vc_column_text][vc_single_image image=&#8221;4604&#8243; img_size=&#8221;medium&#8221; alignment=&#8221;center&#8221;][vc_empty_space][vc_single_image image=&#8221;4605&#8243; img_size=&#8221;medium&#8221; alignment=&#8221;center&#8221;][vc_empty_space][vc_column_text]\n<ol start=\"3\">\n<li><strong> High Speed Performance:<\/strong><\/li>\n<\/ol>\n<ul>\n<li><strong> Servo Meter:<\/strong><\/li>\n<\/ul>\n<p>\u25ba Servo motors have higher speed than stepper motors.<\/p>\n<p>\u25ba Servo motor is able to output more torque at a specified RPM than a stepper motor.<\/p>\n<p>\u25ba Number of poles affects the number of times a motor winding needs to be advanced for a full motor revolution.[\/vc_column_text][vc_single_image image=&#8221;4606&#8243; img_size=&#8221;medium&#8221; alignment=&#8221;center&#8221;][vc_empty_space][vc_column_text]\n<ul>\n<li><strong> Stepper Motor: <\/strong><\/li>\n<\/ul>\n<p>\u25ba Different performance of torque happens due to the difference of pole count as well as winding inductance between the designs of servo motor and stepper motor.<\/p>\n<p>\u25ba It is able to respond quickly, position accurately without an encoder, and easily generate holding torque.<\/p>\n<p>\u25ba However, due to high winding inductance, pole count, and L\/R constants, the torque decreases in the high speed region.<\/p>\n<p>Difference of performance between stepper motor and servo motor can be shown through the following speed-torque curves:[\/vc_column_text][vc_single_image image=&#8221;4608&#8243; img_size=&#8221;medium&#8221; alignment=&#8221;center&#8221;][vc_empty_space][vc_column_text]\n<ol start=\"4\">\n<li><strong> Closed-Loop Feedback: <\/strong><\/li>\n<\/ol>\n<ul>\n<li>Servo motor:<\/li>\n<\/ul>\n<p>\u25baServo motor\u00a0uses feedback method to control position, speed, or torque of the motor.<\/p>\n<p>\u25baAddition of feedback complicates the design of the driver and increases number of components.<\/p>\n<p>\u25ba It is more expensive and requires more processing time. The ratio between load and rotor inertia of motor increases due to its closed-loop feedback.[\/vc_column_text][vc_single_image image=&#8221;4609&#8243; img_size=&#8221;medium&#8221; alignment=&#8221;center&#8221;][vc_empty_space][vc_column_text]\n<ul>\n<li>Stepper Motor:<\/li>\n<\/ul>\n<p>\u25baStepper motor\u00a0is operated through a command to move to a specific location without feedback but may lose synchronism because of overload.<\/p>\n<p>\u25ba Stepper motor can handle about 10 times of its rotor inertia and a servo motor can handle 100 times of its rotor inertia.<\/p>\n<p>\u25ba It needs few components for operation because It can be operated without feedback.<\/p>\n<p>\u25ba It is more cost-effective than servo motor.[\/vc_column_text][vc_single_image image=&#8221;4610&#8243; img_size=&#8221;medium&#8221; alignment=&#8221;center&#8221;][vc_empty_space][vc_column_text]\n<ol start=\"5\">\n<li><strong> Efficiency: <\/strong><\/li>\n<\/ol>\n<ul>\n<li><strong> Servo meter: <\/strong><\/li>\n<\/ul>\n<p>\u25ba Closed-loop feedback of servo motor allows more efficient current control that affects motor temperature and service life.<\/p>\n<p>\u25ba Efficient current control provides low noise and vibration.<\/p>\n<ul>\n<li><strong> Stepper Motor: <\/strong><\/li>\n<\/ul>\n<p>\u25ba Stepper motor\u00a0uses a current chopper driver technology that provides a constant current supply regardless of load.<\/p>\n<p>\u25ba It is better to produce holding torque at zero speed.<\/p>\n<p>\u25ba It likes to vibrate more if it is not sized properly.<\/p>\n<p>\u25ba The temperature rises with operating duty.\u00a0 This is why duty cycle needs to be limited for stepper motors.<\/p>\n<p>Plot of the temperature rise against the operating duty cycle [%] of a motor has been shown in the following figure:[\/vc_column_text][vc_single_image image=&#8221;4612&#8243; img_size=&#8221;medium&#8221; alignment=&#8221;center&#8221;][vc_empty_space][vc_column_text]\n<h2 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"Differences_between_Servo_and_Stepper_Motor_Table\"><\/span>Differences between Servo and Stepper Motor (Table)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p style=\"text-align: center;\">\n<table id=\"tablepress-38-no-2\" class=\"tablepress tablepress-id-38\">\n<thead>\n<tr class=\"row-1 odd\">\n\t<th class=\"column-1\"><strong>Parameters<\/strong><\/th><th class=\"column-2\"><strong>Servo Motor<\/strong><\/th><th class=\"column-3\"><strong>Stepper Motor<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-hover\">\n<tr class=\"row-2 even\">\n\t<td class=\"column-1\"><strong>Operation System<\/strong><\/td><td class=\"column-2\">Closed Loop<\/td><td class=\"column-3\">Open Loop<\/td>\n<\/tr>\n<tr class=\"row-3 odd\">\n\t<td class=\"column-1\"><strong>Size<\/strong><\/td><td class=\"column-2\">Longer Body<\/td><td class=\"column-3\">Small Body<\/td>\n<\/tr>\n<tr class=\"row-4 even\">\n\t<td class=\"column-1\"><strong>Speed-Torque Characteristics<\/strong><\/td><td class=\"column-2\">High torque at high speed<\/td><td class=\"column-3\">High torque at low speed<\/td>\n<\/tr>\n<tr class=\"row-5 odd\">\n\t<td class=\"column-1\"><strong>Responsiveness<\/strong><\/td><td class=\"column-2\">Delay on starting<\/td><td class=\"column-3\">Quick response<\/td>\n<\/tr>\n<tr class=\"row-6 even\">\n\t<td class=\"column-1\"><strong>Synchronization,\/strong><\/td><td class=\"column-2\">Motion delay with command<\/td><td class=\"column-3\">Motion synchronized with command<\/td>\n<\/tr>\n<tr class=\"row-7 odd\">\n\t<td class=\"column-1\"><strong>Costs<\/strong><\/td><td class=\"column-2\">Higher<\/td><td class=\"column-3\">Lower<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-38-no-2 from cache -->\n<p><strong>Servo Motor: <\/strong><\/p>\n<p><strong>Advantages: \u00a0<\/strong>\u25cf Closed loop control\u25cf High torque at high speed \u25cf Low motor heating \u25cf Better for variable load system.<\/p>\n<p><strong>Disadvantages: <\/strong>\u25cf Complex control \u2013 tuning required \u25cf Position feedback required \u25cf High system cost<\/p>\n<p><strong>Stepper Motor:<\/strong><\/p>\n<p><strong>Advantages: <\/strong>\u00a0\u25cf Simple design control \u25cf No feedback required \u25cf Excellent low speed torque \u25cf Low system cost<\/p>\n<p><strong>Disadvantages: <\/strong>\u00a0\u25cf Torque decreases as speed increases \u25cf Constant current regardless of requirements \u25cf Unable to react to changes of load.[\/vc_column_text][vc_column_text]\n<h2 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Stepper motors are efficient for low-speed and accuracy applications. These are compact and inexpensive and good for medical, biotech, security and defense, and semiconductor manufacturing applications. On the other hand, servo motors are better for high speed and accuracy applications and good for packaging, converting, and web processing applications. The trade-off is a higher cost and complexity.[\/vc_column_text][vc_empty_space height=&#8221;28px&#8221;][vc_btn title=&#8221;Check out Assun Motor&#8217;s Range of Planetary Gearboxes.&#8221; color=&#8221;danger&#8221; size=&#8221;lg&#8221; align=&#8221;center&#8221; css_animation=&#8221;bounceInUp&#8221; link=&#8221;url:https%3A%2F%2Fassunmotor.com%2Fonline-shop%2Fplanetary-gearbox&#8221;]<div  class='epic_comment_container jeg_custom_comment_wrapper  '><\/div>[\/vc_column][\/vc_row]\n","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_column_text]Servo Motor: A servo motor is known as an electric motor that is used for exact control of angular or linear position, speed, and torque. It is an appropriate motor connected to a sensor for position feedback and a controller that adjusts the motor\u2019s shifting. Applications: Servo motor has huge industrial applications such as robotics, [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[52],"tags":[55,61],"class_list":["post-2405","post","type-post","status-publish","format-standard","hentry","category-knowledgebase","tag-servo-motor","tag-stepper-motor"],"acf":[],"_links":{"self":[{"href":"https:\/\/assunmotor.com\/blog\/wp-json\/wp\/v2\/posts\/2405","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/assunmotor.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/assunmotor.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/assunmotor.com\/blog\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/assunmotor.com\/blog\/wp-json\/wp\/v2\/comments?post=2405"}],"version-history":[{"count":5,"href":"https:\/\/assunmotor.com\/blog\/wp-json\/wp\/v2\/posts\/2405\/revisions"}],"predecessor-version":[{"id":4804,"href":"https:\/\/assunmotor.com\/blog\/wp-json\/wp\/v2\/posts\/2405\/revisions\/4804"}],"wp:attachment":[{"href":"https:\/\/assunmotor.com\/blog\/wp-json\/wp\/v2\/media?parent=2405"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/assunmotor.com\/blog\/wp-json\/wp\/v2\/categories?post=2405"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/assunmotor.com\/blog\/wp-json\/wp\/v2\/tags?post=2405"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}