Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1985-06-06
1987-09-15
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Linear
446469, H02K 4100
Patent
active
046942092
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a moving element apparatus of a linear motor and a method for producing it.
BACKGROUND OF ART
In a prior art moving element body of a linear pulse motor, as shown in FIG. 1, pole bodies 1 and 2 connected with each other on their top surface by means of a flat plate 5 were formed on their outer ends with bearing portions 3 and 4, respectively, having a substantially U-shaped section and said bearing portions 3 and 4 were processed on the inner walls 3a and 4a so as to be parallel to the upper surface of a stator (not shown). Thereafter, axles 6 and 7 were fitted into the bearing portions 3 and 4, respectively, and fixed to them by a bonding agent.
The pole bodies 1 and 2 were made firstly by connecting a pole plates 1A and 2A with each other by a connector portion 8 and press forming them into an integral plate, and then by fixing a large number of such integral plates into a multilayered construction and fixing the flat plate 5 of, for example, magnet on the upper surface of it by a bonding agent, and finally, because of the necessity to separate the pole bodies 1 and 2 magnetically, by cutting said connector portion 8 into moving element bodies.
For this reason, the axles 6 and 7 would become fall off the bearing portions 3 and 4, respectively, because of, for example, deterioration of the bonding agent, thereby making it impossible for the moving element to move on the stator. Further, since the pole bodies 1 and 2 were connected together by the flat plate 5 on their upper surfaces only, pole teeth 1a and 2a formed on the ends of the pole bodies 1 and 2, respectively, were flexible to make the clearance between the pole teeth 1a, 2a and the stator unfixed. This presented a disadvantage of low stopping accuracy of the moving element.
Other disadvantages of the prior art linear motor moving element body were a large number of assembly steps required and a low production efficiency provided.
Accordingly, an object of the present invention is to provide a linear motor moving element and a method for producing it, capable of substantially reducing the number of assembly steps of the moving element body and increasing the stopping accuracy of the moving element.
DISCLOSURE OF INVENTION
A linear motor moving element according to the present invention is characterized in that a magnetic soft iron sheet is punched and processed into a large number of pole pieces formed therein with a plurality of magnetic poles having a predetermined distance therebetween, which are built up in layers into two or more pole bodies, thereafter the pole bodies are provided with wheel axles, and than a holder plate of a non-magnetic material having openings for receiving said magnetic poles thereinto is fitted to the magnetic poles, thereby securely interconnecting the pole bodies and fixing the wheel axles to the pole bodies.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a perspective view of a prior art moving element body;
FIG. 2 is a perspective view of a pole piece according to one embodiment of the present invention;
FIG. 3 is a perspective view of pole bodies according to one embodiment of the present invention;
FIG. 4(a) to 4(c) are perspective views showing assembly of a moving element according to one embodiment of the present invention;
FIG. 5 is a perspective view of a moving element body apparatus according to one embodiment of the present invention; and
FIG. 6 is a perspective view of a holder plate according to another embodiment of the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will first be described in detail with reference to the drawings.
An electromagnetic soft iron sheet finished in a uniform thickness is punched and processed by a press into a large number of poles pieces 12, as shown in FIG. 2, provided with magnetic poles 11 having pole teeth 10 at ends thereof and with a flat axle portion 13A for resting the axle thereon. The magnetic poles 11 are formed to have a distance L therebetween.
Then, a l
REFERENCES:
patent: 3648084 (1972-03-01), Laithwaite
patent: 3711989 (1973-01-01), Nielsen
patent: 4623807 (1986-11-01), Nakamura
Patent Abstracts of Japan E-103, Apr. 23, 1982, vol. 6/No. 64 and Japanese Patent Appln. No. 55-80627, filed Jun. 13, 1980.
Dwarf High Precise Linear Motor and its Applicant, published Sep. 20, 1983.
Duggan Donovan F.
Tokyo Juki Industrial Co. Ltd.
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