Hi Everyone
Just started my coursework online and Im starting to get my head around the basic formulas but have had a brain malfunction.
Im trying to work out the formula for the following question.
The output of a series dc motor connected to a 210v supply running at 1230rev/min is 3.2kw
The supply current for this load is 20.5A
Calculate the Torque developed & Operating efficiency.
Torque = E Ia/ 2πn (but I need the Emf for this calculation?)
Emf = V - Ia (RaRf) (But I dont know the field winding or armature resistance?)
Can anyone point me in the correct direction as to what calculation I need to do first to find the torque and efficiency??
Thanks
Just started my coursework online and Im starting to get my head around the basic formulas but have had a brain malfunction.
Im trying to work out the formula for the following question.
The output of a series dc motor connected to a 210v supply running at 1230rev/min is 3.2kw
The supply current for this load is 20.5A
Calculate the Torque developed & Operating efficiency.
Torque = E Ia/ 2πn (but I need the Emf for this calculation?)
Emf = V - Ia (RaRf) (But I dont know the field winding or armature resistance?)
Can anyone point me in the correct direction as to what calculation I need to do first to find the torque and efficiency??
Thanks