{"id":237271,"date":"2022-10-10T04:49:17","date_gmt":"2022-10-10T04:49:17","guid":{"rendered":"\/forum\/forums\/topic\/electro-magnetic-power-vs-shaft-power-of-motor\/"},"modified":"2022-10-10T04:49:17","modified_gmt":"2022-10-10T04:49:17","slug":"electro-magnetic-power-vs-shaft-power-of-motor","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/electro-magnetic-power-vs-shaft-power-of-motor\/","title":{"rendered":"Electro magnetic Power Vs Shaft power of motor"},"content":{"rendered":"

Hello. I designed a 2-D FE BLDC motor and the windings are excited with an external circuit (fig 1).I tried to calculate the motor actual input power with three volt meter and three ammeter and I used the  formula to calculate the motor input power Pin_motor = Average (Ia*Va+Ib*Vb+Ic*Vc).<\/strong>The <\/strong>result is shown in fig 2. I assigned core loss in rotor and stator (result in fig3) and eddy effects in magnets and with estimated phase resistance (rph) I calculated copper loss with the formula Pcopper = Average ((Ia^2+Ib^2+Ic^2)*rph)<\/strong>. The motor power value I receive by subtracting all losses (Coreloss, solidloss, Copperloss) from Pin_motor <\/strong>is close to the value of electromagnetic power which is Moving1.Torque*Moving1.speed<\/strong>. Should it not be equal to Shaft power? I learnt from a previous post in forum is that the shaft power is calculated by subtracting Coreloss from Moving1.Torque*Moving1.speed. <\/strong>But here the power I am getting by subtracting all losses from motor input power is a value close to electromagnetic power not Shaft power. Shouldn’t be the output is shaft power? The moving1.torque curve is shown in figure 4 and I am summerizing all corresponding values with used formula in table 1. <\/p>\n

 <\/p>\n

Fig 1: External Circuit<\/p>\n

<\/p>\n

Fig 2: Motor input power                                                            Fig 3: Coreloss (Assigned in rotor and stator)<\/p>\n

<\/p>\n

Fig 4: Moving Torque<\/p>\n

Table: 1 <\/p>\n

<\/p>\n

You can download and check the calculation from the google drive link: Calculation_table<\/a><\/p>\n

Sorry for the long post. In one sentence,  the output power = input power – loss <\/strong>matches only if I consider the moving1.torque is shaft torque(which is motor output power). Kindly let me know where I may have mistaken.<\/p>\n","protected":false},"template":"","class_list":["post-237271","topic","type-topic","status-closed","hentry","topic-tag-AnsysMaxwellelectronics-1","topic-tag-bldc-motor","topic-tag-electric-motor-1","topic-tag-maxwell-circuit","topic-tag-torque","topic-tag-torque-calculation"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["255997","186775"],"_bbp_author_ip":["23.220.96.180"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["2845"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["237271"],"_bbp_forum_id":["27793"],"_bbp_engagement":["186775","255997"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["237970"],"_bbp_last_active_id":["237970"],"_bbp_last_active_time":["2022-10-18 13:45:50"]},"test":"junaed-buetgmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/237271","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/237271\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=237271"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}