JPS60200756A - step motor - Google Patents

Abstract

PURPOSE:To reduce the thickness and to obtain a sufficient output torque by forming a magnetized portion in which sole poles are arranged on the side surface toward the axial direction of a rotational shaft in a rotor of a step motor. CONSTITUTION:A disc-shaped rotor 10 has a disc unit 11 of thin plate shape, an annular magnet 12 of synthetic resin, and a rotor shaft 13. A stator 14 has a stator pole 15 projected oppositely to the magnet 12, and the shaft 13 is rotatably supported through a bearing 17 to the boss 16 of the central portion of the pole. Rotor teeth are formed radially on one surface of the magnet 12, and the rotor teeth side is magnetized at S-pole. Pinion 19 is formed also radially at the end of the pole 15, and a drive coil 20 is wound in a monofilament winding. Thus, the coil 20 can be sequentially energized in the direction of 20A 20B. The rotor 10 is rotated clockwise to increase the generated output torque.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a step motor, and more particularly to a technique for reducing the thickness of a step motor.

[Prior Art] Step motors have been widely used in various fields because they have advantages such as easy control (good Q-positioning accuracy and no need for maintenance).

By the way, this Suup Tanabata is! It is in the direction of 1, which is becoming thinner as the equipment in which the stator is used becomes more compact and thinner, but the stator faces the stator in the radial direction at d3. PM type (pernlallollt Ma!
+net Type > and VR type (Variable
Due to its structure, step motors such as ReluctanceTVlie) or Heitz Totsudo PM type,
If the device is too thin, the required 1 to 1 lux cannot be obtained, so it cannot be made thinner than a certain limit, and this is one of the factors that prevents the device from being made thinner.

In other words, in a radial gap type step motor,
Since the magnitude of the output torque is approximately proportional to the length of the J chain in the direction parallel to the rotational axis where the stator's magnetic poles and the rotor's rotor teeth overlap, the output torque is approximately equal to Jl.
In order to achieve this, it was necessary to increase their length, or the thickness of the step motor, by a certain degree.

In addition, the conventional radial gear V-tube type step motor C has an increased number of divisions per rotor rotation! In this case, the motor as a whole becomes unwieldy, which has the disadvantage that miniaturization is not possible.

[Purpose] The present invention has been developed in consideration of these circumstances, and its purpose is to reduce the thickness and achieve a sufficient output power of 1 herk. The object of the present invention is to provide a small, multi-segment step motor.

[Structure] In order to achieve this object, the step motor according to the present invention has only single poles spaced at equal intervals on one side of the disc-shaped body in the direction of the rotation axis (A). a rotor having magnetized portions magnetized in a C-array; a stator having stator magnetic poles protruding from the magnetized portions of the rotor; The rotor is configured to include a bearing that rotatably supports the rotor with a fixed spacing between the stator core and a drive coil group that is wound around each magnetic pole of the stator core.

[Example] Hereinafter, a first example embodying the present invention will be described in detail based on FIGS. 1 to 6.

1 and 2 are a plan view and a cross-sectional view taken along the line Δ-Δ, respectively, showing an embodiment of a step motor according to the present invention. A thin disk-shaped disk body 11 and a metal plate (jl 1:
, 1 [J-tall 1113] [J-tall 1113] [J-tall 1113
It is composed of -.

On the other hand, the stator 14 has a protruding stator magnetic pole 15 facing one surface of the magnet 12 of the rotor 1o, and a boss portion 1G formed at the center has a rotor shaft 13 rotatable through a bearing 17. is supported by. In other words, the rotor 1o and the stator 14 are relatively rotatable around the axis of the rotor shaft 13 (rotation axis of the rotor core 10), and one surface of the magnet 12 and the stator magnetic pole 15 are aligned in a direction parallel to the axis. They are placed with a small distance between them.

On one surface of the magnet 12 of the rotor 10, 25 rotor teeth 18 are arranged radially and equally spaced on the same circumference centered on the axis of the rotor shaft 13 as shown in FIG. is installed, and the magnet 12 is! ”-The evening tooth 18 side is S
The pole is magnetized so that the joint surface side of the disc coil 11 becomes the north pole.

The stator magnets (15) of the stator 14 are arranged radially on the same circumference centering on the axis of the rotor shaft 13, as shown in FIG.
, 15C, 15D are formed at the tip of each J3, and five small teeth 19 are provided at the same pitch as the rotor teeth 18.
are provided, and the stator 1111 poles 15 are disposed at d3 on these ridges 19 and face the rotor teeth 18 with an extremely small gap between them. In addition, drive coils 2OA and 20B are attached to those stator magnetic poles 15.
, 20G.

20D are each monofila-wound to J3, and when the drive coil 20 is energized, the N pole is the N pole, and each magnetic pole 30 is
It is made to appear at the tip of the.

In FIG. 1, when the rotor 10 is rotated in the h1 direction, the drive coil 20 is rotated 20A→20B→20C→20
Each of the magnets is sequentially excited in the order of D.

For example, when the coater 10 is rotated clockwise in FIG. 1, at a'3, as shown in FIG. When energized, stator pole 1
The rotor 10 is moved to the right in FIG. 5 because the lines of magnetic force move so that the 1"-3 tooth 18 faces the tooth 19 of the rotor 5B.

In this way, each of the drive coils 20 is
The rotor 10 is rotated clockwise by being sequentially excited in the yj direction of 20Δ→20 +3→20C→20D. Also, if you want to avoid rotating in the anti-old direction, drive = "
The rotor 101J is rotated in the counterclockwise cutting direction by sequentially exciting the coil 20 in the direction of 20Δ-1201)→20G-→2013.

If the conditions such as the number of turns of the excitation coil and the excitation current are the same, the output 1 ~ torque generated in this case is as follows: I hear it. In other words, without increasing the thickness of the rotor and stator in order to obtain the desired output power of 1 to 1 kW compared to the conventional radial gap type, the same effect can be achieved by making the rotor and stator thicker in the radial direction. can be obtained. As is clear from this, according to the steps of the present embodiment, even if the thickness of the comb is thinner than that of the conventional comb, it is possible to avoid generating a sufficient 1-lux. In addition, since the radial dimensions of the rotor and stator can be increased, it is possible to form a large number of small teeth of the rotor and stator magnetic poles on the same circumference. The number of divisions can be increased.

Next, a second embodiment embodying the present invention will be described based on FIGS. 7 to 12. Note that the same parts as in the first example are given the same reference numerals, and the 1st revision of N2 is omitted.

As shown in FIG. 9, the magnets 12 of the rotor 10 are arranged so that magnetized parts and non-magnetized parts are arranged alternately with the same width, and the part marked 6F&1 is The side facing the stator magnetic pole 15 is the S pole, and the disc body 11
It is magnetized so that the side becomes the north pole, and the magnetized portions are stepped at six places 12A to 12.The magnet 12 is connected to the ferrite 1 by a magnet or a synthetic resin magnet. −)°C is formed.

The stator magnetic pole 15 of the stator 1/l has the [1-ta 1
0 towards the magnet 12 side 8f [! ;l 141 pole 15△
~151-1 are formed protrudingly, their tip surfaces are simply formed, and their stator magnetic poles 15 are 1)
Set a slight gap against the magnet 12,
) are arranged. Also, those stator magnetic poles 1
As shown in FIG. 10, two sets of magnetic poles 15 are arranged in the same direction and separated by 90 degrees. 20a and 20b are monofila-wound, and J3 is connected to the drive coil 20a.
When current flows from Δ to A', magnetic pole 1
5Δ, N pole at 15E! An S pole appears at the l poles 15C and 15G, and when a current is passed from A' to A, the opposite pole appears, and the drive coil 20
B has J3, and similarly, the stator magnetic poles of people are S pole or N pole.
The poles are made to appear.

-3 CL in Fig. 7] When rotating the motor 10 in the counterclockwise t1 direction, the stator magnetic poles 15 are changed from 15A to 15B to 15.
In the order of C→15D...N41, the drive coils 20a and 20b are sequentially excited. For example, as shown in FIG.
When the magnetic part 12A is attracted and held for 1t, the drive coil 20a is turned on according to the time chart of FIG.
When the excitation of is canceled and a current is passed through the drive coil 20b in the direction from B to B', the magnetized portion 12B of the magnet 12 is attracted by the action of the N pole appearing on the stator 1j pole 15B, and the rotor 10 is moved to the left in FIG.

In this way, the exciting coils 20a and 20b are sequentially excited according to timer 1 shown in FIG. 12, thereby causing the rotor 10 to rotate counterclockwise.

J, when rotating the rotor 10 in the direction of the support shaft 1 in FIG. 7, the stator magnetic pole 15 is 15△
→ 1511 → 15G → 15F... J: The rotor 10 is rotated in the old 81 direction by sequentially exciting the drive coils 20a and 20b.

In this way, the same effects as in the first embodiment described above can be obtained also in this second embodiment.

Next, a third embodiment embodying the present invention will be described based on FIG. 13. Note that the same parts as in the first embodiment are designated by the same reference numerals, and detailed explanation thereof will be omitted.

The rotor 10 is composed of a thin disk-shaped disk 11, an annular magnet 12 set on the outer circumferential side thereof, and an annular body 21 attached to the magnet 12. , the annular body 21 is provided with a 0-low rain 18 similar to the peak of the magnetic LJ 12 in the first embodiment, and has a high magnetic permeability, for example, 3% (porous steel, pure iron d , /: are made of permalloy or the like.

Moreover, the magnet 12 is the same as the magnet 12 in the first embodiment.
The magnet 1 is magnetized so that the stator 14 side is an S pole and the disk body 11 side is an N pole. In this way, 1 of this example
] - Evening 10 is the rotor of the magnet 12 that is applied to the first embodiment! Reference numeral 118 is a trap formed separately from the C magnet 12 by the annular body 21 of highly permeable moon rice, and is operated in substantially the same manner as in the first embodiment.

[Effect] As detailed above, the step motor according to the present invention has d
3-C is the surface fi'it of the magnetic elf on which the computer cuts the lines of magnetic force according to the rotation of the rotor: 1. Unlike the conventional radial gap type, it is proportional to the length in the radial direction of the overlapping portion between the magnetic poles of the stator and the magnetized portion of the rotor.

In other words, the output torque can be increased by increasing the radial length of the magnetized portion of the rotor and the stator magnetic poles.
There is no need to make the wire thick, and the entire step motor can be made thinner.

In addition, since the circumferential width of each of the stator magnetic poles and the rotor W1811 can be easily reduced, the number of divisions can be increased, making it possible to configure a multi-division step motor. Become.

[Brief explanation of the drawing]

1 to 6 show a first embodiment of the step motor according to the present invention, FIG. 1 is a plan view, and FIG. 2 is a first embodiment of the step motor.
Figure 3 is a reduced view of the rotor body shown in Figures 1 and 2, viewed from the stator side. Fig. 5 is an explanatory diagram to clarify the principle of generating the force that rotates the rotor, Fig. 6 is an explanatory diagram showing the excitation method of the drive coil, and Fig. 7 to Fig. 7 shows the second embodiment, FIG. 7 is a plan view, FIG. 8 is a sectional view taken along line 8-A in FIG. 7, and FIG. 9 is a reduced view of the rotor body with the stator side facing away. Fig. 10 is a scaled-down view of the stator viewed from the rotor side, Fig. 11 is an explanatory drawing to explain the principle of generating horns that prevent the rotor from rotating, Fig. 12 is a timing chart showing how to excite the drive coil, Figure 13 is a cross-sectional view showing the third embodiment. In the figure, 101 is a rotor, 12 is a magnet, 13 is a 1"-shaft, 171 is a stator, 15 is a stator magnetic pole, and 17 is a beam φ.
1 receiver and 20 are drive coils. Patent Applicant Fukuza T Kan Co., Ltd. President Kawa@Katsuni Figure 2 1n Figure 4 i+,;

Claims (1)

[Claims] 1. A magnetized portion 1111 is provided on one surface of the disc-shaped body, in which only single poles are arranged at equal intervals on one surface in the direction of the rotation axis. A magnetic pole is formed protruding from the shield magnetic part of the stator, and the magnetic pole is provided on the stator, and the magnetized part and the stator magnetic pole are provided on the stator. A step motor comprising: a bearing rotatably supporting the rotor with a predetermined spacing therebetween; and a drive coil 8Y wound around each stator pole of the stator.