JPS62262647A - Linear motor - Google Patents

Abstract

PURPOSE:To form the coil pitch of a plane coil shortly and accurately, by deviating the position of multiple pieces of plane coil mutually in a predetermined pitch and inserting an insulation between the plane coils to integrate them. CONSTITUTION:N pieces of plane coil 20 formed at equal intervals in turn-around conductor pitch (coil pitch) are positioned so as to be mutually deviated in the pitch direction by the length of one(1) Nth of a coil pitch. Between these N pieces of plane coil 20 an insulating film 23 is inserted and put one on top of the other so that the N pieces of plane coil 20 and insulating films 23 may be integrally formed.

Description

[Detailed Description of the Invention] The invention for Ll upper diagram desk 1 minute river is a small-sized device used in, for example, an X-Y plotter.
Regarding lightweight, high-resolution linear motors.

Figure 2 is a schematic diagram showing the structure of a stator and a movable element of a conventional linear induction motor.

The stator 40 is composed of a stator core 41 and a winding coil 42 wound around a groove 44.
The stator core 41 has a punched electric iron plate,
It is formed by stacking. In addition, each tooth portion 43
are located with respect to each other with equal coil pitches P.

The mover 50 located at a distance of the gap G from the stator 40 is
It is generally constructed from metal plates combined with copper or aluminum.

The conventional linear induction motor stator described above has the following problems.

Since the groove portions 44 and the tooth portions 43 of the stator core 41 are formed by punching out an electric iron plate, it is not easy to shorten the coil pitch P and finish them with high precision. Therefore, it is difficult to improve the resolution (minimum feed) and positioning accuracy of the linear induction motor, and it is difficult to downsize the motor.

The present invention was devised to solve the above-mentioned problems, and an object of the present invention is to provide a linear motor having a short and precisely formed coil pitch in the stator.

The movable element of the linear motor according to the present invention has the same configuration as the conventional one, but the stator, that is, the coil for generating a moving magnetic field, has a pitch of folded conductors (hereinafter referred to as coil pitch). )
N planar coils formed at equal intervals are positioned offset from each other in the pitch direction by a length of 1/N of the coil pitch, and an insulator is inserted between the N planar coils and overlapped. , the N planar coils and the insulator are integrally formed.

When an N-phase current is applied to each of the planar coils of Nl [I that constitute the false stator, the N planar coils are arranged with an electrical angle pitch that corresponds to the N-phase current, so the planar coils A moving magnetic field is generated on the coil surface.

Part 1 As an embodiment (N layer 2) according to the present invention, FIG. 1(a)
1 shows a sectional view of the stator of the linear motor, and FIG. 1(b) shows a plan view thereof.

The mover has the same configuration as the conventional one (not shown), but the stator IO has a pattern formed by etching.
A planar coil 20 in which a conductor 21 and a conductor 22 are formed on an insulating film 23 is integrally formed on a ferromagnetic material such as an iron plate 30 with the insulating film 23 interposed therebetween. The conductor 21 and the conductor 22 have a rectangular folded shape,
They are located offset from each other in the pitch direction by a length of 1/2 of the coil pitch P.

When two-phase currents having a phase shift of 90 degrees are passed through the conductor 21 and the conductor 22, a moving magnetic field is generated on the stator IO.

In this embodiment, the conductor 21 is placed on the insulating film 23. conductor 2
Although the pattern was formed by direct etching of the coil 2, it is also possible to form the planar coil in advance by punching or the like, and then integrally form the planar coil with the insulating plate to form the stator.

The shape of the folded conductor is not limited to a rectangular folded shape like the conductors 21 and 22, but may be triangular, saw-shaped, or
It is possible to have a folded shape such as a wave shape.

Furthermore, the power supply for generating a moving magnetic field is not limited to a two-phase power supply, but can also be applied to an N-phase power supply by forming the planar coil into N layers.

As yet another embodiment, FIG. 3(a) shows a sectional view of a linear stator, and FIG. 3(b) shows a plan view thereof.

In order to increase the magnetic flux density on the stator 10, on the iron plate 30,
A convex tooth portion 31 is provided at an interval of 1/2 of the coil pitch P by etching or the like, and the conductor 21 and the conductor 22 are attached to the periphery of the tooth portion 31 with the conductor 21 and the conductor 22 sandwiched between them. The coil 20 is connected to the stator 1 via the insulating film 23.
It is also possible to form it integrally on 0.

As explained above, according to the present invention, it is possible to form a planar coil with a short coil pitch and with high precision using conventional printed circuit board pattern creation technology. If adopted for the stator of
It has excellent positioning accuracy (minimum feed) and positioning accuracy, and due to the structure of the stator, it has the effect that a small and lightweight linear motor can be easily manufactured.

[Brief explanation of drawings]

FIG. 1(a) is a sectional view of a stator of a linear motor as an embodiment of the present invention, and FIG. 1(b) is a plan view thereof.
FIG. 3 is a schematic diagram showing the configuration of a stator and a mover of a conventional linear induction motor, and FIG. 3(a) is a sectional view of a stator of a linear motor as another embodiment according to the present invention. Third
Figure (b) is also a plan view. 10... Stator, 20... Planar coil, 21...
Conductor, 22... Conductor, 23... Insulating film. Patent jaw person Shimadzu Risakusho Co., Ltd. Agent Patent attorney Takaharu Ohnishi (a) (b) (a) (b) Figure 3 Procedure Amendment (Method) % formula % 2. Name of the invention Linear Motor 3, relationship with the case of the person making the amendment Patent applicant address 37 Roots Funa Omachi, Kawaramachi-dori Nijo-shita, Nakagyo-ku, Kyoto City
Address 8 Name (199) Shimabara Manufacturing Co., Ltd. Representative 100
Minoru Hachijo 4, Agent Address: 16-36, Hashizume-cho, Uchihonmachi, Higashi-ku, Osaka City, ?
Number of inventions increased due to di addition 07, Subject of amendment: ``Brief explanation of drawings 1'' in the description 8, Contents of amendment

Claims (1)

[Claims] (1) When N is an integer value of 2 or more, N planar coils in which the pitch of the folded conductors is formed at equal intervals are shifted from each other in the pitch direction by a length of 1/N of the pitch. and a stator in which the N planar coils and the insulator are integrally formed by inserting and overlapping an insulator between each of the N planar coils.