 
 <prompt> Wetin dem need consider? Based on di question wey dey above, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: "A PM motor no get field winding for the stator frame, instead e dey rely on PMs to provide the magnetic field wey the rotor field go interact with to produce torque. Compensating windings wey dey in series with the armature fit dey used for large motors to improve commutation under load. Because this field dey fixed, e no fit adjust for speed control. PM fields (stators) dey convenient for miniature motors to eliminate the power wey the field winding dey consume. Most larger DC motors na "dynamo" type, wey get stator windings. Historically, PMs no fit retain high flux if dem disassemble; field windings dey more practical to get the needed amount of flux. However, large PMs dey costly, as well as dangerous and difficult to assemble; this one dey favor wound fields for large machines." 