Has any body worked on emag FEA analysis on commutator DC motors(not PM brushless)? can you explain me how to select the symmetry, give boundry conditions etc?
Best is to use the DC motor with DC drive. Generally for unwinder application the motors with speed ratio of 1: 3 is used. At the start of the unwind, the macine operates at base speed, giving max. torque(you have to calculate) and as the dia. of the roll reduces, the machine operates in field...
As you might be aware, Speed control of DC motors is easy as compared to AC motors.
Speed control of D C motors has two parts. 1) Constant torque control 2) Constant HP control
In constant torque control, the armature voltage is varied from 0 to rated voltage to get speed from 0 to base speed...
Pesently the trend is to use DC motor for hybrid bus vehicle. IIT Delhi has recently completed the project of developing Eicher motors India 18 seater bus with DC motor(30 kW). Now they are going ahead with 90kW D C motor to be used in bus developed by Tata Engineering & Locomotive Ltd., Pune...
we have a need for a calculation technique that will allow us to accurately calculate the Torque Pulsation Amplitudes and Frequencies associated with Large commutator DC Motor Designs based on machine geometry. Are there any softwares?
Thanks in advance.
