Patent ID: 6441528
Filing Date: 2002-08-27
Classification: H02K,Y10T

Abstract:
A plurality of synchronous motors of different kinds, each having a stator formed by stacking stator cores and a rotor with permanent magnets, said synchronous motors being produced by a method comprising:(a) preparing a group of stators, each stator being formed by stacking stator cores of identical shape so that heights of the stators are different from one another, the heights being equal to integer multiples of a predetermined height in accordance with predetermined output torque specification values and predetermined rotor inertia specification values; (b) preparing a plurality of groups of rotors so that lengths of the rotors in each group are different from one another, the lengths being equal to integer multiples of a predetermined length in accordance with predetermined rotor inertia specification values, said rotors in each group being provided with permanent magnets having a residual magnetic flux density different from that of permanent magnets of the rotors in another group in accordance with predetermined output torque specification values, each of said rotors having an identical outer diameter; and (c) selecting a stator from said group of the stators prepared in step (a) and a rotor from said groups of the rotors prepared in step (b) in accordance with a preset output torque specification value and a preset rotor inertia specification value, and combining the selected stator with the selected rotor, in different combinations of the rotor and the stator for each of the different kinds of the synchronous motors, each of said stator and said rotor being selected such that a length of the selected rotor is equal to a height of the selected stator.