JPH04355659A - Linear pulse motor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear pulse motor, and more particularly to a linear pulse motor suitable for driving a magnetic head in, for example, a word processor.

0002

2. Description of the Related Art A linear pulse motor is used, for example, in a word processor to linearly move a magnetic head in the radial direction of a floppy disk to position it on a target track.

This type of linear pulse motor has conventionally been composed of a stator having four magnetic poles and a movable element that slides on the stator. Conventionally, as shown in FIG. 3, this mover has a thin magnetic material plate 2 on which a plurality of magnetic pole teeth 1 are formed in rows, and a guide groove 3 is formed near one side in parallel to the row direction of the magnetic pole teeth 1. It had a structure in which it was adhered to a magnetic material plate 4.

0004

[Problems to be Solved by the Invention] However, in the conventional linear pulse motor mover constructed as described above, the structure is such that the thin magnetic material plate 2 is bonded to the magnetic material plate 4, so that the weight is low. There were problems in that it was heavy and had a large inertia during movement and poor responsiveness.

Furthermore, since the guide groove 3 and the magnetic pole teeth 1, which guide the movement of the mover relative to the stator, are formed separately on the magnetic material plate 4 and the magnetic thin plate 2, the magnetic pole teeth 1 and the guide grooves 1 are formed separately on the magnetic material plate 4 and the magnetic material thin plate 2, respectively. There was also a problem that the orthogonality with the groove 3 deteriorated, resulting in a decrease in the positioning accuracy of the linear pulse motor.

The present invention has been made in view of the above circumstances, and provides a linear pulse that is lightweight, has a movable element with excellent orthogonality between the magnetic pole teeth and the guide groove, and is capable of improving positioning accuracy. The purpose is to provide motors.

[0007]

[Means for Solving the Problems] The linear pulse motor of the present invention includes a stator provided with a plurality of first magnetic pole teeth arranged in a row, and a guide groove in which a rotating member provided on the stator engages. In a linear pulse motor comprising a mover having first magnetic pole teeth and a plurality of second magnetic pole teeth arranged in a row in the same direction, the guide groove and the second magnetic pole teeth are arranged on the same magnetic material plate. It is characterized by the fact that it has been formed.

[0008]

[Operation] In the linear pulse motor with the above configuration, the magnetic pole teeth and the guide groove are formed on the same magnetic material plate, so the thin magnetic material plate that was conventionally required is no longer required, and the weight of the mover can be reduced. can. Therefore, the inertia of the movable element can be reduced, and the responsiveness of a linear pulse motor using this movable element can be improved.

Furthermore, since the magnetic pole teeth and the guide groove are simultaneously formed on the same magnetic material plate, the degree of orthogonality between the magnetic pole teeth and the guide groove is improved. As a result, the positioning accuracy of the linear pulse motor using this movable element can be improved.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the linear pulse motor of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show the configuration of an embodiment of the present invention. In FIG. 2, a linear pulse motor 11 is composed of a stator 12 and a movable element 13. A reinforcing plate 15 is fixed on a rectangular mounting plate 14 of the stator 12, and a rectangular frame-shaped retainer 16 is mounted on the reinforcing plate 15. Two balls 17 and two rollers 18 as rotating members are rotatably supported on two opposing sides of the retainer 16, respectively. Further, on the upper surface of the reinforcing plate 15, a V-shaped first guide groove 19 is formed parallel to one side. Then, the balls 17 fit into the first guide grooves 19 and the rollers 18 come into contact with the reinforcing plate 15, thereby defining the moving direction of the retainer 16 with respect to the reinforcing plate 15.

A rectangular opening is formed in the center of the mounting plate 14 and the reinforcing plate 15, and a pair of iron yokes 20 having a rectangular cross section are provided in parallel within this opening. A permanent magnet 21 is sandwiched between the yokes 20, and two coils (not shown) are connected in series and wound around each yoke 20. First magnetic pole teeth 23 are respectively attached to the yoke 20 at the positions where the four coils are wound. A plurality of first magnetic pole teeth 23 are provided in a direction perpendicular to the first guide groove 19, and the pitch and number of teeth are all equal. Further, the two first magnetic pole teeth 23 provided oppositely on the same yoke 20 are shifted from each other by 1/2 pitch.

On the other hand, as shown in FIG. 1, a second guide groove 24 is formed in one side of the movable element 13, which is formed into a rectangular shape from a magnetic material plate such as pure iron, close to and parallel to one side. The ball 17 held by the retainer 16 fits into the second guide groove 24. This fitting defines the moving direction of the movable element 13 relative to the retainer 16. In this state, at a position facing the first magnetic pole teeth 23 of the mover 13, two rows of second magnetic pole teeth 2 are arranged in the same direction as the first magnetic pole teeth 23.
5 is formed. The second magnetic pole tooth 25 and the second guide groove 24 are simultaneously formed on the magnetic material plate by photo-etching. Further, the pitch and tooth width of the second magnetic pole teeth 25 are the same as those of the first magnetic pole teeth 23, but the two rows of second magnetic pole teeth are shifted by 1/4 pitch from each other.

A pair of gears 26 are provided near one side of the mounting plate 14.
(Only the upper large gear is shown in the figure) are supported coaxially and rotatably. The upper large gear 26a meshes with a rack 13a formed on the side of the movable element 13, and the lower small gear (not shown) meshes with a rack 16a formed on the side of the retainer 16. In addition, the racks 13a, 1
6a has teeth of the same pitch, and the number of teeth of the large gear 26a is twice the number of teeth of the small gear. Therefore, the retainer 16
moves in the same direction by half the amount of movement of the mover 13. Since the driving method of the linear step motor 11 is well known, its explanation will be omitted.

According to this embodiment, the second guide groove 24 and the second magnetic pole teeth 25 are simultaneously formed on the magnetic plate forming the movable member 13, so that the magnetic thin plate that is conventionally required is eliminated. This becomes unnecessary, and the weight of the mover 13 can be reduced. Therefore, the inertia of the movable element 13 can be reduced, and the responsiveness of the linear pulse motor 11 using this movable element 13 can be improved.

Furthermore, the second guide groove 24 and the second magnetic pole tooth 2
5 are formed by etching at the same time, the degree of orthogonality between the guide groove 24 and the magnetic pole teeth 25 is improved, and characteristics such as running accuracy of the linear pulse motor 11 can be improved and positioning accuracy can be improved.

[0017]

As explained above, according to the linear pulse motor of the present invention, the guide groove and the magnetic teeth are simultaneously formed on the same magnetic material plate constituting the mover, thereby reducing the weight of the mover. It is possible to reduce the inertia and improve the responsiveness of the linear pulse motor. At the same time, the degree of orthogonality between the guide groove and the magnetic teeth is improved, and the positioning accuracy of the linear pulse motor can be improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the configuration of a mover according to an embodiment of a linear pulse motor of the present invention.

FIG. 2 is a perspective view showing a schematic configuration of a linear pulse motor according to the present embodiment.

FIG. 3 is a perspective view showing the configuration of a movable element of a conventional linear pulse motor.

[Explanation of symbols]

11 Linear pulse motor 12 Stator 13 Mover 17 Ball (rotating member) 23 First magnetic pole tooth 24 Guide groove 25 Second magnetic pole tooth

Claims (1)

[Claims] 1. A stator in which a plurality of first magnetic pole teeth are arranged in a row, a guide groove in which a rotating member provided on the stator engages, and a guide groove in which a plurality of first magnetic pole teeth are arranged in a row in the same direction. A linear pulse motor comprising a mover having a plurality of second magnetic pole teeth provided in a shape, wherein the guide groove and the second magnetic pole teeth are formed on the same magnetic material plate. pulse motor.