In my practical application requirement i want higher torque and at lower speed motor is it possible to design a normal PERMANENT MAGNET DC MOTOR to a high torque dc motor with change some modifications in winding and permanent magnets ?
Dear Shiva, a high torque and low speed motor includes many material. The relationship between power and mass is unflattering. The number of pole pairs is very high.
Dear Shiva
Of course it is possible to design a high torque - low speed permanent magnet machines. As Dr. Jacob mentioned it above, the PM machine will have several poles (20. 40 60 etc ...according to your design...the amount of torque you need).
See the equation below how the PM machines torque depend on P.
T=3 P/2 [λm iq + id iq (Ld -Lq) ]
Your effective air gap diameter (D) increases. T is directly proportional to D2.
The speed limit you want puts a design limitation on your back emf (E) and consequently determine your voltage supply from converters.
Number of stator slots (Z or Qs) is a function of phase number, pole number and number of slots/pole/phase (q) ).
If you need details, you can ask.
Samuel Lakew Please share some details, I need to design a high torque motor of about 160 Nm.
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