{"id":1214,"date":"2022-03-25T15:51:48","date_gmt":"2022-03-25T14:51:48","guid":{"rendered":"https:\/\/hydromot.lu\/techblog\/drive-design-of-hydraulic-motors\/"},"modified":"2023-10-17T10:20:13","modified_gmt":"2023-10-17T08:20:13","slug":"drive-design-of-hydraulic-motors","status":"publish","type":"post","link":"https:\/\/www.hydromot.lu\/techblog\/en\/drive-design-of-hydraulic-motors\/","title":{"rendered":"Drive: Design of hydraulic motors"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1214\" class=\"elementor elementor-1214 elementor-1095\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-ead8e20 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"ead8e20\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-d7345b9\" data-id=\"d7345b9\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2e0cca4c elementor-widget elementor-widget-text-editor\" data-id=\"2e0cca4c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>Drive calculation for vehicles<\/h2><h3>1. motor speed: n, RPM<\/h3><figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.hydromot.lu\/hydroblog\/wp-content\/uploads\/2017\/01\/Screenshot_4.png\" alt=\"Equation\" \/><\/figure><p><strong>v<\/strong> <sub><strong>km<\/strong> &#8211; vehicle speed, km\/h;<\/sub><\/p><p><strong>v<\/strong> <sub><strong>ml<\/strong> &#8211; vehicle speed, mil\/h;<\/sub><\/p><p><strong>R<\/strong><sub><strong>m<\/strong> &#8211; rolling radius wheel, m;<\/sub><\/p><p><strong>R<\/strong><sub><strong>in<\/strong> &#8211; rolling radius wheel, in;<\/sub><\/p><p><strong>i<\/strong> &#8211; transmission factor from motor to drive wheels. Without transmission gear, i=1.<\/p><h3>2. rolling resistance: RR, daN [lbs]<\/h3><p>Resistance force, which results from the contact of the wheels on different surfaces:<\/p><p>RR=G x \u03c1<\/p><p><strong>G<\/strong>&#8211; total weight of the vehicle load, daN [lbs]<\/p><p><strong>\u03c1<\/strong>&#8211; coefficient of rolling resistance (Table 1)<\/p><figure class=\"wp-block-image\"><img decoding=\"async\" title=\"\" src=\"https:\/\/www.hydromot.lu\/hydroblog\/wp-content\/uploads\/2017\/01\/Oberfl%C3%A4chen.png\" alt=\"\" \/><\/figure><h3>3. gradient resistance: GR, daN [lbs]<\/h3><p>GR=G x (sin\u03b1 + \u03c1 x cos\u03b1)<\/p><p><strong>\u03b1<\/strong> &#8211; inclination angle (Table 2)<\/p><figure class=\"wp-block-image\"><img decoding=\"async\" title=\"\" src=\"https:\/\/www.hydromot.lu\/hydroblog\/wp-content\/uploads\/2017\/01\/Screenshot_7.png\" alt=\"\" \/><\/figure><h3>4. acceleration force: FA, daN [lbs]<\/h3><p>The force <strong>FA,<\/strong> required to achieve acceleration from 0 to a maximum velocity <strong>v<\/strong> in time <strong>t<\/strong>, is calculated using the following formula:<\/p><figure class=\"wp-block-image\"><img decoding=\"async\" title=\"\" src=\"https:\/\/www.hydromot.lu\/hydroblog\/wp-content\/uploads\/2017\/01\/Screenshot_8.png\" alt=\"\" \/><\/figure><p><strong>FA<\/strong> &#8211; acceleration force, daN [lbs]<\/p><p><strong>t<\/strong> &#8211; time, [s].<\/p><p>\u00a0<\/p><p style=\"text-align: center;\">Find out more about <a href=\"https:\/\/hydromot.lu\/techblog\/en\/hydraulic-motors\/\" target=\"_blank\" rel=\"noopener\"><strong>hydraulic motors<\/strong><\/a>!<\/p><p>\u00a0<\/p><p>\u00a0<\/p><h3>5. tensile force: DP, daN [lbs]<\/h3><p>Tractive force DP is the additional tractive force required to move the trailer. This value is calculated as follows:<\/p><ul><li>according to the designer&#8217;s assessment<\/li><li>by calculating the forces according to points 2, 3 and 4 for the trailer; the calculated sum corresponds to the tractive force sought<\/li><\/ul><h3>6. total tensile force: TE, daN [lbs]<\/h3><p>The total tractive force TE is the tractive force needed to move the vehicle; this is equal to the sum of the forces calculated according to points 2 to 5 with a \u00a0 increase of 10% due to air resistance.<\/p><p>TE=1,1 x (RR + GR + FA + DP)<\/p><p><strong>RR<\/strong> &#8211; force needed to overcome rolling resistance;<\/p><p><strong>GR<\/strong> &#8211; force needed to overcome the slope;<\/p><p><strong>FA<\/strong> &#8211; force needed for acceleration (acceleration force);<\/p><p><strong>DP<\/strong> &#8211; additional traction effort (trailer).<\/p><h3>7. torque of the motor: M, daNm [in-lb]<\/h3><p>Required torque for each hydraulic motor:<\/p><figure class=\"wp-block-image\"><img decoding=\"async\" title=\"\" src=\"https:\/\/www.hydromot.lu\/hydroblog\/wp-content\/uploads\/2017\/01\/Screenshot_9.png\" alt=\"\" \/><\/figure><p><strong>N<\/strong> &#8211; number of motors;<\/p><p><strong>\u03b7<sub>m<\/sub><\/strong>-mechanical efficiency of the gearbox (if any).<\/p><h3>8. wheel adhesion: M<sub>W<\/sub>, daNm [in-lb]<\/h3><figure class=\"wp-block-image\"><img decoding=\"async\" title=\"\" src=\"https:\/\/www.hydromot.lu\/hydroblog\/wp-content\/uploads\/2017\/01\/Screenshot_10.png\" alt=\"\" \/><\/figure><p>To avoid wheel slip, <strong>M<sub>W<\/sub><\/strong> should be larger than <strong>M.<\/strong><\/p><p><strong>f<\/strong>&#8211; Coefficient of friction;<\/p><p><strong>G<sub>W<\/sub><\/strong>&#8211; total weight over wheels, daN [lbs]<\/p><figure class=\"wp-block-image\"><img decoding=\"async\" title=\"\" src=\"https:\/\/www.hydromot.lu\/hydroblog\/wp-content\/uploads\/2017\/01\/Screenshot_11.png\" alt=\"\" \/><\/figure><p><strong>9. radial load of the motor: P<sub>rad<\/sub> [daN] [lbs]<\/strong><\/p><p>If the motor is used to drive vehicles with wheels mounted directly on the motor shaft, the total radial load on the motor shaft <strong>P<sub>rad<\/sub><\/strong> \u00a0 is equal to the sum of the driving and load force acting on one wheel.<\/p><figure class=\"wp-block-image\"><img decoding=\"async\" title=\"\" src=\"https:\/\/www.hydromot.lu\/hydroblog\/wp-content\/uploads\/2017\/01\/Screenshot_12.png\" alt=\"\" \/><\/figure><p><strong>G<sub>W<\/sub><\/strong> &#8211; weight carried by the wheel<br \/><strong>P<sub>rad<\/sub><\/strong> &#8211; Total radial load on the motor shaft<br \/><strong>M\/R<\/strong> &#8211; Driving force<\/p><p>According to the calculated loads, the suitable motor can be selected from this catalog.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-2128be0 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"2128be0\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-05f913a\" data-id=\"05f913a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7e1f508 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"7e1f508\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-md\" href=\"https:\/\/www.hydromot.lu\/en\/Hydraulic-motor--Gerotor-motor--Orbital-motor-Hydromotor\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">find our hydraulic motors here!<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Drive calculation for vehicles 1. motor speed: n, RPM v km &#8211; vehicle speed, km\/h; v ml &#8211; vehicle speed, mil\/h; Rm &#8211; rolling radius wheel, m; Rin &#8211; rolling radius wheel, in; i &#8211; transmission factor from motor to drive wheels. Without transmission gear, i=1. 2. rolling resistance: RR, daN [lbs] Resistance force, which&hellip;&nbsp;<a href=\"https:\/\/www.hydromot.lu\/techblog\/en\/drive-design-of-hydraulic-motors\/\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">Drive: Design of hydraulic motors<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":1389,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","neve_meta_sidebar":"right","neve_meta_container":"","neve_meta_enable_content_width":"on","neve_meta_content_width":75,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"[\"title\",\"meta\",\"thumbnail\",\"content\",\"tags\"]","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","neve_meta_reading_time":"","_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[22],"tags":[],"class_list":["post-1214","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hydraulikmotoren-blog"],"_links":{"self":[{"href":"https:\/\/www.hydromot.lu\/techblog\/en\/wp-json\/wp\/v2\/posts\/1214","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hydromot.lu\/techblog\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hydromot.lu\/techblog\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hydromot.lu\/techblog\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hydromot.lu\/techblog\/en\/wp-json\/wp\/v2\/comments?post=1214"}],"version-history":[{"count":17,"href":"https:\/\/www.hydromot.lu\/techblog\/en\/wp-json\/wp\/v2\/posts\/1214\/revisions"}],"predecessor-version":[{"id":5584,"href":"https:\/\/www.hydromot.lu\/techblog\/en\/wp-json\/wp\/v2\/posts\/1214\/revisions\/5584"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hydromot.lu\/techblog\/en\/wp-json\/wp\/v2\/media\/1389"}],"wp:attachment":[{"href":"https:\/\/www.hydromot.lu\/techblog\/en\/wp-json\/wp\/v2\/media?parent=1214"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hydromot.lu\/techblog\/en\/wp-json\/wp\/v2\/categories?post=1214"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hydromot.lu\/techblog\/en\/wp-json\/wp\/v2\/tags?post=1214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}