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AssigneeSanyo Denki Co., Ltd.
InventorsAkihiko Takahashi, Yasushi Misawa, Manabu Horiuchi
Estimating the term…
A method and a system for determining deterioration of permanent magnets of an electric apparatus to be inspected that facilitate determination without the need to remove the electric apparatus from a facility where it is installed. If the electric apparatus to be inspected is a three-phase linear motor, a current detector is used to acquire currents. A three-phase/two-phase conversion section converts the acquired currents into an α-axis current command and a β-axis current command. A locus of a current vector is computed based on the α-axis current command and the β-axis current command. A comparing and determining section compares the computed locus with a standard upper limit value stored in a storage means. If the number of times that the locus of the current vector exceeds the standard upper limit value exceeds a predetermined value, it is determined that the permanent magnets have been deteriorated.
A method of determining deterioration of permanent magnets of an electric apparatus to be inspected, the electric apparatus to be inspected including a mover, a stator, a plurality of permanent magnets provided at one of the mover and the stator, and an armature winding provided at the other of the mover and the stator, the method comprising:
A deterioration determining system for permanent magnets configured to determine a state of deterioration of a plurality of permanent magnets of an electric apparatus to be inspected, the electric apparatus to be inspected including a mover, a stator, the permanent magnets provided at one of the mover and the stator, and an armature winding provided at the other of the mover and the stator, the deterioration determining system for permanent magnets comprising:
Dependencies are inferred from the claim text.