{"id":646,"date":"2020-10-09T12:17:53","date_gmt":"2020-10-09T10:17:53","guid":{"rendered":"https:\/\/traxial.com\/?p=646"},"modified":"2022-04-04T16:50:54","modified_gmt":"2022-04-04T14:50:54","slug":"axial-flux-motor-vs-radial-flux-motor-a-focus-on-magnetic-field-orientation","status":"publish","type":"post","link":"https:\/\/traxial.com\/uncategorized\/axial-flux-motor-vs-radial-flux-motor-a-focus-on-magnetic-field-orientation\/","title":{"rendered":"Axial Flux Motor vs Radial flux Motor: A Focus on Magnetic Field Orientation"},"content":{"rendered":"

Compared to traditional radial flux electric motors, axial flux machines, especially “single stator – double rotor” topologies, are more effective in an electromagnetic sense. This blog post explains why.<\/p>\n

 <\/p>\n

Electric<\/span>al Machines are designed to generate torque on a rotor shaft, thanks to magnetic forces created by\u00a0<\/span>magnetic fields.\u00a0<\/span>\u200b<\/p>\n

To explain the impact of magnetic field orientation, a straight coil of wire fed by a DC current can be used to generate a nearly uniform magnetic field similar to a\u00a0<\/span>bar magnet, as visualized in the picture below.<\/span><\/p>\n

\"Radial_machine_Vs_Axial_Machine_pptx\"\"Radial_machine_Vs_Axial_Machine_pptx-2\"<\/p>\n

When feeding the same coil by a sinusoidal current source (AC),\u00a0 the magnetic field prod<\/span>uc<\/span>ed will be oriented in\u00a0<\/span>function of the current sign.\u00a0<\/span><\/p>\n

\"Radial_machine_Vs_Axial_Machine_pptx-3\"\"Radial_machine_Vs_Axial_Machine_pptx-4\"<\/span><\/p>\n

In permanent magnet (PM) motors (radial and axial), the set of AC windings generate a series of north and south magnetic poles\u00a0<\/span>along the air-gap of the machine.<\/span>\u200b<\/p>\n

The interaction between these poles and the permanent magnetic poles on the rotor surface, is responsible for\u00a0<\/span>the\u00a0<\/span>to<\/span>rque<\/span>\u00a0production.\u00a0<\/span>\u200b<\/p>\n

B<\/span>ased<\/span>\u00a0on the flux direction in the air gap<\/span>,<\/span>\u00a0<\/span>electrical\u00a0<\/span>machines are\u00a0<\/span>designated<\/span>\u00a0as either a radial-\u00a0<\/span>or<\/span>\u00a0an axial flux\u00a0<\/span>machine.<\/span><\/p>\n

\"Radial_machine_Vs_Axial_Machine_pptx-5\"<\/span><\/p>\n

In a<\/span>\u00a0radial f<\/span>lux<\/span>\u00a0machine<\/span>,\u00a0<\/span>the air-gap\u00a0flux is radial and the conductors are axial\u00a0<\/span>whereas in an<\/span>\u00a0axial f<\/span>lux<\/span>\u00a0 machine,\u00a0<\/span>the air-gap flux is axial and the conductors are radial.\u00a0<\/span><\/p>\n

 <\/p>\n

\"Radial_machine_Vs_Axial_Machine_pptx-6\"\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\"Radial_machine_Vs_Axial_Machine_pptx-8\"<\/span><\/p>\n

\"Radial_machine_Vs_Axial_Machine_pptx-7\"<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

Conclusion:<\/strong><\/p>\n

A yokeless axial flux machine allows the use of a double rotor. Since the PM machine output torque is proportional to the effective air-gap area for a constant electrical and magnetic loading, the AFPM (axial flux permanent magnet) machine with double air-gap (rotor) achieves a higher torque-to-weight ratio. This is further leveraged by “lever” effect; For axial flux machines, the magnets are located further away from the central axis. This results in a larger lever on the central axis, and as such produces more torque.\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Compared to traditional radial flux electric motors, axial flux machines, especially “single stator – double rotor” topologies, are more effective in an electromagnetic sense. This blog post explains why.   Electrical Machines are designed to generate torque on a rotor shaft, thanks to magnetic forces created by\u00a0magnetic fields.\u00a0\u200b To explain the impact of magnetic field…<\/p>\n","protected":false},"author":18,"featured_media":656,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","content-type":"","footnotes":""},"categories":[1],"tags":[19],"post_series":[],"_links":{"self":[{"href":"https:\/\/traxial.com\/wp-json\/wp\/v2\/posts\/646"}],"collection":[{"href":"https:\/\/traxial.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/traxial.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/traxial.com\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/traxial.com\/wp-json\/wp\/v2\/comments?post=646"}],"version-history":[{"count":1,"href":"https:\/\/traxial.com\/wp-json\/wp\/v2\/posts\/646\/revisions"}],"predecessor-version":[{"id":655,"href":"https:\/\/traxial.com\/wp-json\/wp\/v2\/posts\/646\/revisions\/655"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/traxial.com\/wp-json\/wp\/v2\/media\/656"}],"wp:attachment":[{"href":"https:\/\/traxial.com\/wp-json\/wp\/v2\/media?parent=646"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/traxial.com\/wp-json\/wp\/v2\/categories?post=646"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/traxial.com\/wp-json\/wp\/v2\/tags?post=646"},{"taxonomy":"post_series","embeddable":true,"href":"https:\/\/traxial.com\/wp-json\/wp\/v2\/post_series?post=646"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}