JPS62262648A - Permanent magnet type surface pulse motor - Google Patents

Abstract

PURPOSE:To improve the positioning accuracy and comformity and to enlarge the thrust of a moving piece, by using a magnetic substance as a moving piece having mXn pieces of electromagnets and as a stator having grid projections. CONSTITUTION:A moving piece 1 is composed of four(4) pieces of electromagnets A-D of 11 secured rectangularly for each of which an electro magnetic coil 112 is wound around an electromagnetic yoke 111 and a slice of a permanent magnet 12 stuck on the gap face opposite to a stator of this electromagnet 11. A stator 2 is composed of a flat plate magnetic substrance having grid projected portions with horizontal x-direction grid pitch lambdax and longitudinal y-direction grid pitch lambday. The relative arrangement of phase electromagnets phase A, phase B, phase C and phase D of each electromagnet 11 is deviated by 1/4 of the grid pitches lambdax and lambday respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention provides a permanent magnet that faces mxn air gaps of electromagnets. The movable element attached to the surface is movably supported two-dimensionally with respect to a flat stator having lattice-like protrusions made of R41 material. Ri-ru.

(Conventional technique #4) Conventional example (Special Publication No. 49-41602, equity 11r (52
There are some hybrid type or variable magnetic resistance type linear pulse motors such as Zynetschik's surface pulse motor (No. 7962), which have linear pulses in the Xfi direction and the Y direction.

(Problems to be Solved by the Invention) In these conventional techniques, the thrust force generated is However, it was small compared to its size, making it difficult to accommodate humans.

Here, the present invention overcomes the difficulties of the conventional example and addresses the requirements for precision and coordination in table feeding of machine tools, XY stages, plotters, etc.
A chair motor is preferable, and a small, high-thrust permanent magnet Nerf Aisbar Smoke 111! Its purpose is to provide

(Problems to be Solved by the Invention) The present invention consists of mxn electromagnets as a mover and a flat magnetic body J as a stator. The movable element is supported with a constant gap between it and the stator so that it can move freely on the surface of the stator. The surface of the stator facing the mover is provided with lattice-like protrusions made of magnetic material at a constant pitch.
A thin plate-like permanent magnet is attached to the magnetic pole surface of the mover electromagnet facing the stator, and this magnet has N and S poles arranged in a lattice pattern with a pole-to-pole pitch equal to the stator lattice pitch. Alternately? : The position of the am
, 2π/n phase difference.

(Function) A permanent magnet type linear pulse motor is deployed in a leaf axe smoke, with 2n steps in the X direction.

The y direction is a square lattice with 2n steps and the number of phases mxn.
The eyes can be divided into 4 mm for positioning, and at the same time a strong thrust can be obtained by rn-n phase excitation.

(Actual/Il!@) A perspective view showing the appearance of one embodiment of the present invention is shown in Fig. 1.
゜This is a 4-phase permanent magnet surface pulse motor with m=2 columns and n=2 rows.

The mover 1 has four electromagnets 11 each having an electromagnet coil 12 wound around the electromagnet 11.

B, C, and D are fixed in a rectangular shape, and l! is opposed to the stator of this electromagnet 11. A thin plate of T4 [i12] is permanently attached to the P-tube surface.

The stator 2 is made of a flat magnetic material, and the horizontal grating pitch λ in the y direction of the lateral ) is provided and formed.

The magnetic tooth pattern of the permanent magnet 12 seen from the tooth surface of the electromagnet 11 is as shown in FIG.

',; 43. The magnetic poles of the electromagnetic coil 112 with vertical lines are strengthened, and the direction of the Il wire is weakened by 1 unit, and The corresponding 1° phase electromagnet Δ loss of each electromagnet i11, the relative arrangement of the B phase, C phase, and D phase are as shown in FIG.
1//I-ri spelling. ! f'<hwa× et al, △, 1B is λx//l, C is λ, //I, D
(The λ8/11 and λ, /4 seem to be police J IJ'.

In Fig. 2, if l-(le 112 is excited, lζ = 1 Ill of 112 < the surrounding magnetic pole is the N pole, and the outer magnetic * located on both a1 is S 14... , the N pole of the permanent mc112a attached If/i to the inner magnetic pole is strengthened, the S pole is weakened, and on the contrary, the Ia f4!S of the permanent 16 convex 121] of the outer magnetic pole is strengthened, N M
i is weakened.

The N pole of the inner permanent magnet 12a and the S pole of the outer permanent magnet 12t, which are strengthened, are exactly at the lattice-like convex portion 21 of the stator 2.
Since it is provided at a position with a pitch that matches (x direction λ8, y direction λ), the lattice-like convex portion 21 is attracted, that is, the movable element 1 moves, and is balanced to the matching position.

Thus, in each electromagnet 11, A is followed by B.

If you switch the excitation to A and B, that is, if A is in the positive phase, then B is also excited in the positive phase, and then A is in the negative phase and B is in the negative phase again, the movable F1+ will be on the left side I\ Move in the X direction.

Furthermore, if Δ is then excited, C0Δ, then C, the movable element 11 moves in the y direction.

J5, Figure 4 shows a route map without showing an example of a means for freely movably supporting and guiding the movable element 1 facing the stator 2, and shows balls 13 arranged at the four corners of the movable element. However, it is sufficient to support four air bearings or magnetic bearings in seven directions.

The following means can be considered as an embodiment of the pond of the present invention.

(a) A cylindrical pulse motor can be created by winding it in a cylindrical shape.

(b) The electromagnet is not limited to winding a 1-phase electromagnetic coil around an E-type electromagnet yoke; it is also possible to wind a 3-phase electromagnetic coil around an E-type electromagnet yoke or a 1-phase electromagnetic coil around a C-type electromagnet coil. Various things are possible, such as

(1) It is also possible to fix the electromagnet side and use the lattice-shaped magnetic body as the mover.

(1) A structure in which the magnetic body convex portion 21 of the stator 2 is replaced with the permanent magnet 12 of the mover 1 is also possible.

(E) As the excitation method for each phase ff1la stone 11, for example, in the case of four phases, one-phase excitation, two-phase excitation, and three-phase excitation.

Many methods are possible, such as 4-phase excitation and 1-2 phase, 2-3 phase, 3-4 phase alternating excitation.

(Force) The movable element 1 can also be made to move along a specific trajectory using a closed loop excitation method.

〔Effect of the invention〕

Thus, according to the present invention, next 18 Gero many F'6
The effect of the stage is reduced by 1q.

■ Since a strong permanent magnet such as rare earth cobalt or neodymium iron boron is used, the IW force is more than three times that of the conventional hybrid type, resulting in a small, high-thrust surface motor.

■ Wide range of applications such as loud fil XY table and machine tool feeding.

■ Compared to the conventional method of combining an X-axis near motor and a Y-axis near motor to create a surf ax smoke, it outputs Iff force in the x and y directions in one phase, so the power utilization rate is high.

■ Since the X-axis and y-axis are not independent, highly accurate positioning control is possible.

[Brief explanation of drawings]

Fig. 1 is an external perspective view of an embodiment of the present invention, Fig. 2 is a diagram of the magnetic pole pattern of the permanent magnet as seen from the electromagnet gap surface, and Fig. 3
The figure is a relative arrangement diagram of phase-constant magnets, and FIG. 4 is a route diagram of the movable element support mechanism. DESCRIPTION OF SYMBOLS 1... Mover, 11... Electromagnet, 111... Electromagnetic yoke, 112... Electromagnetic coil, 12, 12a. 12b... Permanent magnet, 13... Mover supporting means. Applicant's agent Mr. Sato Figures 3 and 4

Claims (1)

[Scope of Claims] 1. The mover includes m×n electromagnets joined in a rectangular shape, and is supported so as to be able to move freely on the stator surface while maintaining a certain gap with the stator. A thin plate-like permanent magnet is attached to the magnetic pole face of the electromagnet facing the stator, and this permanent magnet is composed of alternating N and S poles magnetized in a lattice shape with a constant pitch, and the stator is a flat plate. The opposing surface of the mover is formed with a lattice-like protrusion of the same magnetic material as the magnetic pole lattice of the mover permanent magnet, and the stator magnetism of the m×n electromagnets is A permanent magnet surface pulse motor characterized in that the magnetic poles of the permanent magnets are positioned relative to the body lattice-like protrusions so that they have a phase difference of 2π/m and 2π/n.