JPH0811047Y2 - Pulse motor - Google Patents

Description

[Detailed Description of the Invention] "Industrial field of application" This invention applies a pulse current to a coil on the primary side to rotate or linearly move the primary side or secondary side on a non-fixed side in a step shape. The present invention relates to a pulse motor.

"Prior Art" As is well known, a pulse motor is a motor that utilizes the phenomenon that the pole teeth formed on each magnetic pole on the primary side and the teeth formed on the iron core on the secondary side are aligned by the magnetic attraction force. Yes, it is also called a stepping motor. 4 and 5 are diagrams showing the configuration of a conventional hybrid type pulse motor. In these figures, 1 is a substantially cylindrical primary side iron core that serves as a stator, and 8 magnetic poles 1 are provided on the inner peripheral side thereof.
A, 1B, 1C, 1D, 1, 1, 1, 1 are respectively arranged at equal circumferential positions, and coils 2A to 2 are wound around the base end of each magnetic pole 1A to 1 respectively. Has been done. Also, each magnetic pole 1A ~
The pole teeth 1a to 1d and the groove portions 3a to 3d are formed at a constant interval P on the tip end surface of the No. 1. In this case, each magnetic pole 1B, 1
C and 1D are sequentially displaced by P / 4 with respect to the magnetic pole 1A,
Further, the magnetic poles 1, 1, 1, 1 are arranged at positions that are point-symmetric with the magnetic poles 1A, 1B, 1C, 1D about the shaft 4. As a result, the magnetic poles 1A to 1D (1 to 1) have a positional relationship in which their phases differ from each other by 90 degrees.

On the other hand, 5 is a secondary rotor that serves as a rotor, and is a permanent magnet 6 attached to a shaft 4 that is rotatably supported.
And a pair of cylindrical secondary side iron cores 7 and 8 mounted so as to sandwich the permanent magnet 6.
On the outer peripheral surfaces of the secondary side iron cores 7 and 8, the pole teeth 1a to 1d are provided.
The tooth portions 7a, 7a, ... And 8a, 8a ,. Also, these tooth portions 7a, 7a, ... and 8a, 8a,
, And each of the pole teeth 1a to 1d of the primary side iron core 1 are formed with a constant gap G.

Then, when pulse currents are supplied to the coils 2A and 2 in opposite directions, as shown in FIG.
, And the tooth portions 7 of the secondary-side iron cores 7 and 8
The positions where a, 7a, ... And 8a, 8a ,. Similarly, a pair of coils 2B and 2 and a coil
By supplying a pulse current to the set of 2C and 2 and coils 2D and 2 sequentially, the secondary rotor 5 with respect to the primary iron core 1
Of the magnetic poles 1A to 1 are sequentially moved along the arrangement direction of the magnetic poles 1A to 1 (the direction of the arrow M shown in the drawing), whereby the secondary rotor 5 rotates.

"Problems to be solved by the invention" By the way, in general, pulse motors are widely used for various OA (office automation) devices, etc., because they can perform highly accurate positioning in an open loop.
It also had the drawback that a large thrust could not be obtained. Therefore, conventionally, as shown in FIG. 4, the tip portions of the magnetic poles 1A to 1 are spread in the direction of the arrow M, that is, in the rotation direction of the secondary side rotor 5, and the number of the pole teeth 1a to 1d is increased. Was increased as much as possible and the opposing area to the secondary side iron cores 7 and 8 was increased to improve the thrust. However, as shown by the dotted line in FIG.
No measures are taken against the leakage magnetic flux flowing in and out from the inner surfaces of the grooves 3a to 3d adjacent to 1d, and it is necessary to minimize the generation of leakage magnetic flux that does not contribute to the generation of thrust to improve thrust. It was an important issue in planning.

This invention was made in view of the above circumstances,
An object of the present invention is to provide a pulse motor in which the thrust is increased by minimizing the generation of leakage magnetic flux flowing in and out from the inner surface of the groove portion adjacent to the pole teeth of each magnetic pole.

"Means for Solving the Problem" The present invention has a primary side formed by arranging a plurality of magnetic poles around which a coil is wound along a specific direction, and tooth portions formed at equal intervals along the specific direction. With the secondary side movable in the specific direction with respect to the primary side, each pole tooth formed on the tip surface of each magnetic pole on the primary side, and each tooth portion on the secondary side. In the pulse motor that moves the primary side or the secondary side in the specific direction by sequentially generating a magnetic flux in the gap between, the width dimension along the specific direction of the tip of each magnetic pole on the primary side, While making the width of the base end portion around which the coil of each magnetic pole is wound larger, the depth dimension of the groove portion adjacent to each pole tooth formed at both end portions of the front end surface of each magnetic pole is set to the magnetic flux inflow. The required dimensions necessary to secure the path are set, and It is characterized in that the groove formed in the center of the tip surface of the pole has a large depth.

[Operation] According to the above configuration, the depth of the groove portions at both ends of the tip surface of each magnetic pole is a required dimension required to secure the magnetic flux inflow path. Since the depth of the groove portions is large, the leakage magnetic flux flowing in and out from the inner surfaces of these groove portions can be minimized.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing the structure of a hybrid type pulse motor according to the first embodiment of the present invention. In this figure, the width dimension along the arrow M direction of the tip of each magnetic pole 1A to 1 of the primary side iron core 1 is larger than the width dimension of the base end around which the coils 2A to 2 of each magnetic pole 1A to 1 are wound. It is large. Further, as shown in FIG. 2 (a), the depth dimension L ₂ of each groove portion 3a _{2 to} 3d ₂ formed at the center of the tip surface of each magnetic pole 1A to ₁ is determined by the tip surface of each of these magnetic poles 1A to 1. Each groove 3a formed at both ends
And it has a greater than ₁ depth dimension L ₁ of ~3d _1. in this case,
The depth dimension L ₁ of each of the groove portions 3a _{1 to} 3d ₁ at both end portions of the tip end surface of each magnetic pole 1A to ₁ is a required dimension required to secure a magnetic flux inflow path.

With such a configuration, the depth dimension L ₂ of each groove portion 3a _{2 to} 3d _{2 in} the central portion of the tip end surface of each magnetic pole 1A to 1 becomes large, so that the inflow and outflow from the inner surface of these groove portions 3a _{2 to} 3d ₂ is performed. It is possible to minimize the leakage magnetic flux generated.

Next, FIG. 3 is a diagram showing a configuration of a linear pulse motor according to a second embodiment of the present invention. In this figure,
10 is a long plate-shaped secondary side scale, on the upper surface of which,
The tooth portions 10a, 10a, ... Are formed at regular intervals P along the longitudinal direction. A slider 11 on the primary side is mounted on the upper surface of the scale 10 in a state of being supported movably in the longitudinal direction of the scale 10 (direction of arrow M) by a support mechanism such as a roller (not shown). The slider 11 is provided with four magnetic poles 11A, 11B, 11C and 11D, and coils 12A to 12D are wound around the base ends of these magnetic poles 11A to 11D, respectively. In addition, pole teeth 11a to 11d are formed at constant intervals P on the tip surfaces of the magnetic poles 11A to 11D, respectively. in this case,
The magnetic poles 11B, 11C, 11D are arranged so as to be sequentially shifted by P / 4 with respect to the magnetic pole 11A. As a result, the magnetic poles 11A to 11D have a positional relationship in which their phases differ from each other by 90 degrees. Further, a constant gap G is formed between each pole tooth 11a to 11d of the slider 11 and each tooth portion 10a, 10a, ... Of the scale 10.

The width dimension of each of the magnetic poles 11A to 11D of the slider 11 along the direction of the arrow M is equal to the width of each coil 12A to 1D of each magnetic pole 11A to 11D.
It is larger than the width of the base end where 2D is wound.
Further, the depth dimension L ₂ of each groove portion 13a _{2 to} 13d ₂ formed in the central portion of the tip surface of each magnetic pole 11A to 11D is the groove portion 13a ₁ formed at both ends of the tip surface of each magnetic pole 11A to 11D. ~ 13d ₁ depth dimension
It is larger than L ₁ .

Also in such an embodiment, since the depth dimension L ₂ of each groove portion 13a _{2 to} 13d _{2 in} the central portion of the tip surface of each magnetic pole 11A to 11D becomes large, from the inner surface of these groove portions 13a _{2 to} 13d ₂ . Leakage magnetic flux flowing in and out can be minimized.

[Advantage of the Invention] As described above, according to the present invention, the width dimension along the specific direction of the tip of each magnetic pole on the primary side is calculated from the width dimension of the base end around which the coil of each magnetic pole is wound. On the other hand, the depth dimension of the groove portion adjacent to each pole tooth formed at both end portions of the tip end surface of each magnetic pole is set as a required dimension required to secure a magnetic flux inflow path, and the depth dimension is larger than the required dimension. Since the depth dimension of the groove portion formed in the central portion of the tip surface of each magnetic pole is large,
The leakage magnetic flux that does not contribute to the generation of the thrust that flows in and out from the inner surface of the groove formed in the central portion of the tip surface is suppressed to the minimum, and the effect that the thrust can be increased can be obtained.

[Brief description of drawings]

FIG. 1 is a front view showing the structure of a hybrid type pulse motor according to the first embodiment of the present invention, FIG. 2 (a) is a view showing the structure of the magnetic pole tip portion of the same embodiment, and FIG. 2 (b) is FIG. 3 is a front view showing the structure of a conventional magnetic pole tip portion, FIG. 3 is a front view showing the structure of a linear pulse motor according to a second embodiment of the present invention, and FIG. 4 is a front view showing the structure of a conventional hybrid pulse motor. FIG. 5 is a side sectional view showing the structure of the pulse motor. 1 ...... primary core, 1 a to 1 d ...... pole teeth, 1A～1 ...... pole, 2A～2 ...... coils, (each pole tip surface at both ends) 3a _{1-3d 1} ...... groove, 3a ₂ ~ 3d ₂ …… Groove (center of each magnetic pole tip surface), 10 …… Secondary scale, 10a …… Tooth, 11…
... Slider (primary side), 11A-11D ... Magnetic poles, 11a-11d ...
… Pole teeth, 12A to 12D …… Coil, 13a _{1 to} 13d ₁ …… Grooves (at both ends of each pole tip face), 13a _{2 to} 13d ₂ …… Grooves (at the center of each pole tip face).

Claims (1)

[Scope of utility model registration request] 1. A primary side formed by arranging a plurality of magnetic poles around which a coil is wound along a specific direction, tooth portions are formed at equal intervals along the specific direction, and with respect to the primary side. And a secondary side movable in the specific direction, and magnetic fluxes are sequentially applied to the gaps between the respective pole teeth formed on the tip surfaces of the primary side magnetic poles and the secondary side tooth portions. In the pulse motor for moving the primary side or the secondary side in the specific direction by generating, the width of the tip of each magnetic pole on the primary side along the specific direction is wound by the coil of each magnetic pole. Is larger than the width dimension of the base end portion of the magnetic pole, and the depth dimension of the groove portion adjacent to the pole teeth formed at both end portions of the tip end of each magnetic pole is necessary to secure the magnetic flux inflow path. The required size, and is formed in the center of the tip surface of each magnetic pole with respect to the required size. A pulse motor characterized in that the groove has a large depth.