Rotating electrical machine
AssigneeTDK Corporation
InventorsNobuyuki Shimbo, Koji Mitake, Toshihiro Kuroshima
Life of this patent
Estimating the term…
Abstract
In an IPM motor, since a first portion which is a pressed powder compact made of soft magnetic powder and has a lower magnetic permeability and a lower saturation magnetic flux density than those of a main body portion made of a laminated steel sheet is replaced and disposed in the vicinity of an inner arc side portion of a right end portion of a permanent magnet, local demagnetization is prevented.
Claims2
A rotating electrical machine comprising a rotor rotatable around a predetermined axis in a predetermined rotational direction and a stator, one of the rotor and the stator includes a magnet holding portion and the other includes a coil holding portion, a plurality of permanent magnets are placed in the magnet holding portion and a plurality of coils are placed in the coil holding portion,
- wherein each of the permanent magnets extends over an entire length of the magnet holding portion in an axial direction of the rotor,
- the magnet holding portion includes a main body portion holding each of the permanent magnets, and a first portion positioned on a rear side in the rotational direction between the permanent magnet and an air gap between the rotor and the stator, and
- the first portion has a lower magnetic permeability than a magnetic permeability of the main body portion of the magnet holding portion, and has a lower saturation magnetic flux density than a saturation magnetic flux density of the main body portion of the magnet holding portion.
Dependencies are inferred from the claim text.