The invention provides a casing assembly, a permanent magnet motor using the casing assembly, and an electric power assisted steering system. The casing assembly includes a casing, a plurality of arc-shaped permanent magnets, and a permanent magnet carrier, the permanent magnet carrier is mounted to the inner wall of the cylindrical sidewall of the casing, and the permanent magnet carrier has a first support part and a second support part that are approximately parallel to each other, and a plurality of connecting rods connecting the first support part and the second support part. The permanent magnets are arranged on the permanent magnet carrier and between the corresponding two connecting rods, and at least part of the radial inner surfaces of the permanent magnets are closer to the central axis of the casing than the radial inner surfaces of the connecting rods. The casing assembly further includes an elastic cylinder inside the permanent magnet carrier, the elastic cylinder has radial outward pretightening force along the casing and elastically abuts against the radial inner surfaces of the permanent magnets and the radial inner surfaces of the connecting rods, so that the permanent magnets can be clamped between the elastic cylinder and the casing. The risk for the detachment of the permanent magnets can be effectively reduced or eliminated.
Electric power assisted steering system, permanent magnet motor of electric power assisted steering system, and casing assembly
2015-11-25
Patent
Electronic Resource
English
PERMANENT MAGNET SYNCHRONOUS MOTOR AND POWER-ASSISTED STEERING SYSTEM
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