a claw - pole permanent - magnet stepping motor includes a pair of cases containing two or more inductors in symmetrical arrangement with multiple claw poles . the case unit has an oval shape having thin flat side walls or thin stepped side walls and connecting thick arcuate surfaces operating to resist external flux leakage from the motor and eliminating magnetic circuit obstructions . the cases , side walls , and inductors allow the motor to have a width to length ratio from about one to one to about one to two thus allowing a reduction in size and a low profile design while retaining available output torque .