Patent ID: 6426577
Filing Date: 2002-07-30
Classification: B29C,F16C,H02K

Abstract:
A rotary synchronous machine comprising:a stator frame; an armature core secured to said stator frame and having armature windings sequentially wound thereon in a direction of rotation; a rotor rotatable relative to said stator frame and having a plurality of magnetic substance segments which are magnetically separated from each other in the direction of rotation; first and second magnetic field cores secured to said stator frame in magnetically-separated relation to said armature core, each of said first and second magnetic field cores having field windings positioned thereon, said field windings being excited by multi-phase alternating currents to produce a rotating magnetic field independently in each of said first and second magnetic field cores; and a linear position detector, said linear position detector detects a positional relationship between the stator frame and the rotor and outputs a positional signal, wherein said magnetic substance segments of said rotor each have axial end surfaces spaced from said magnetic field cores via first air gaps, said magnetic substance segments of said rotor each have a circumferential surface spaced from said armature core via a second air gap, and magnetic flux paths of said rotating magnetic field produced from each one of said magnetic field cores pass through said one of said magnetic field cores, one of said first air gaps, said magnetic substance segments, said second air gap and said armature core to thereby produce magnetic poles on the surfaces of said magnetic substance segments facing said one of said first air gaps and said second air gap, wherein an axial thrust depending on a difference between first intensity of the multi-phase altering current supplied to the field windings of said first magnetic core and intensity of the multi-phase alternating currents supplied to the field windings of said second magnetic core is produced in said rotor, and wherein axial thrust is controlled by controlling at least one of said first and second intensities of the multi-phase alternating currents.