Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1997-03-03
1998-05-26
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Linear
310 42, H02K 4103
Patent
active
057570914
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a permanent magnet field pole for a permanent magnet synchronous linear motor which is popularly used for driving a movable member of a machine tool.
DESCRIPTION OF THE RELATED ART
In order to drive a movable member of a machine tool, a permanent magnet synchronous linear motor is used. This permanent magnet synchronous linear motor has a structure, which comprises a shifting magnetic field generation means and a permanent magnet field pole, composed of a plurality of permanent magnets arranged to have N pole and S pole set alternately, and in which the shifting magnetic field and the permanent magnetic field pole are disposed confronting each other for enabling relative movement.
A conventional structure of this permanent magnet field pole is shown in FIG. 2. This magnetic pole has a structure in which a plurality of permanent magnets 2 are embedded in a resin layer 3 attached on the upper surface of a yoke 1 having a rectangular shape. These permanent magnets 2 are arranged in the longitudinal direction of the yoke 1 (i.e., an A'--A' direction shown in FIG. 2) such that magnetic poles on the upper surfaces of the permanent magnets 2 are alternately arranged in a manner like N, S, N, S, . . . Since the upper and lower surfaces of the permanent magnets 2 have opposite polarities as a matter of course, the poles of the lower surfaces are also alternately arranged like S, N, S, N, . . .
The dimensions (length and width) of the yoke 1 defines the dimensions of a field pole. In general, the length (dimension in the A'--A' direction in FIG. 2) of the yoke 1 ranges between 500 mm and about 10 m, and the width (dimension in the direction perpendicular to the A'--A' direction) is about 300 to 500 mm at most. The thickness is about 15 mm. As the material of the yoke 1, a soft iron plate is used. Each permanent magnet 2 has a magnetic flux density of about 1 Tesla and a thickness of about 5 mm.
This permanent magnet field pole is mounted on a machine tool or the like so that one end of each permanent magnet field magnetic pole is fixed opposite to the shifting magnetic field generation means and the other end relatively moves with respect to the shifting magnetic field generation means.
Since the permanent magnet 2 has a strong magnetic flux density of about 1 Tesla, it is not easy to attach the permanent magnet 2 to the yoke 1. Also, it is not easy to handle each field pole after the permanent magnet 2 is attached to the yoke 1. Depending on the situation, the field pole can be dangerous in handling. In addition, magnetization of the permanent magnets 2 may be performed after the permanent magnets 2 are assembled on the yoke 1 so that handling of the field pole is made easy. However, this operation is not easily performed by using an ordinary magnetizer.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a permanent magnet field pole for a linear motor in which an operation of attaching a permanent magnet to a yoke, handling of a field pole obtained by attaching the permanent magnet to the yoke, and magnetization after the mounting of the permanent magnet to the yoke can be made easy.
In order to achieve the above object, according to the first aspect of the present invention, there is provided a permanent magnet field pole for a linear motor, wherein a plurality of field pole units, each comprising a plurality of permanent magnets arranged and fixed on a rectangular yoke plate having a predetermined width and a predetermined length, are arranged in a manner such that magnetic poles, differing in polarity from adjacent poles, are sequentially arranged and fixed in the longitudinal direction of the yoke plate, and the plurality of field pole units are held by a frame member to be arranged in the longitudinal direction of the frame member.
According to the second aspect of the present invention, there is provided a permanent magnet field pole for a linear motor, wherein a plurality of first field pole un
REFERENCES:
patent: 5128569 (1992-07-01), Gladish
patent: 5345669 (1994-09-01), Zigler et al.
patent: 5450050 (1995-09-01), Ban et al.
Higashi Syougo
Sogabe Masatoyo
Fanuc Ltd.
Jones Judson H.
Stephan Steven L.
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