Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-11-20
1994-04-12
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 42, 310112, 310162, 310217, 310261, H02K 2112
Patent
active
053028767
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a rotor of a synchronous motor which comprises a rotor core assembly including a generally cylindrical rotor core formed by a lamination of thin magnetic plates and a plurality of permanent magnets arranged and affixed on the periphery of the rotor core at predetermined equal pitches in a circumferential direction, and a rotating shaft coaxially passing through the rotor core assembly and integrally affixed to the rotor core. More particularly, the present invention relates to a rotor of a synchronous motor of which a rotor core assembly can be separated into a plurality of rotor core units in order to facilitate magnetizing of the permanent magnets in the manufacturing process of a large-size electric motor.
BACKGROUND ART
In a rotor of a synchronous motor which includes a plurality of permanent magnets for forming magnetic poles, a rotor having a rotor core assembly including a generally cylindrical rotor core formed by a lamination of thin magnetic plates and a plurality of permanent magnets arranged and affixed on the periphery of the rotor core at predetermined pitches in a circumferential direction, is known. In this type of rotor, a magnetizing process of the permanent magnets has been generally performed for each of a simple permanent magnet material, individually, before incorporating the same into the rotor core, or for all permanent magnet materials after affixing them at predetermined positions on the rotor core.
However, these conventional methods of magnetizing have had problems as described below when the electric motor must be increased in size. First, in the method of magnetizing a simple permanent magnet material, since the size of the permanent magnet material is also increased following the scaling up of a motor, it becomes difficult to correctly affix large and heavy permanent magnets at predetermined positions on a rotor core when the permanent magnets are affixed to the rotor core after being magnetized, and this problem is increased by the repelling magnetic force between the adjoining magnets. Further, in the method of magnetizing all permanent magnet materials after affixing them on the rotor core, a large-size magnetizer becomes necessary in accordance with the scaling up of the motor, and manufacture of such a magnetizer would not be easy. Accordingly, the method may be considered of using a relatively small normal magnetizer for magnetizing the same pole part of the permanent magnet materials affixed on the rotor core and repeating this to magnetize the overall magnet materials, but this method is not desirable since the leakage flux will have a detrimental effect on the magnets other than the magnetized part during the magnetization of each part.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a rotor of a synchronous motor wherein the magnetization of a plurality of permanent magnet materials affixed on the periphery of a rotor core can be easily performed even with a large-size electric motor.
To accomplish the above object, the present invention provides a rotor of a synchronous motor, in the type as stated at the beginning of this description, wherein the rotor core assembly is formed by coaxially connecting a plurality of rotor core units in an axial direction. In this rotor, each of the rotor core units includes a generally cylindrical auxiliary rotor core formed by a lamination of thin magnetic plates and constituting the rotor core of the rotor core assembly by mutually connecting the auxiliary rotor core in the axial direction, fastening means for integrally fastening and holding a laminated construction of the auxiliary rotor core, a plurality of auxiliary permanent magnets arranged and affixed on a periphery of the auxiliary rotor core at predetermined equal pitches in the circumferential direction and constituting the permanent magnets of the rotor core assembly by mutually connecting the auxiliary permanent magnets in the axial direction, aligning means for aligning the auxiliary
REFERENCES:
patent: 4642502 (1987-02-01), Carpenter
patent: 4714852 (1987-12-01), Kawada
patent: 4792713 (1988-12-01), Bush
patent: 4795936 (1989-01-01), Crossetto
patent: 5140211 (1992-08-01), Uchida
patent: 5157297 (1992-10-01), Uchida
patent: 5200662 (1993-04-01), Tagami
Higashi Syougo
Iwamatsu Noboru
Fanuc Ltd.
Skudy R.
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