JPH09224366A - Linear motor - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To prevent a mover of a linear motor from moving even when a power supply is turned off, thereby avoiding a collision with peripheral devices due to the move of the mover. SOLUTION: A movable element 4 which travels on a guide rail 2 is provided, and a fixed side yoke 11 formed in a square shape and a part of which is cut out and arranged in parallel to the stator, and a leg portion of the fixed side yoke is wound. The exciting coil 13, the movable yoke 14 arranged to face the notched portion of the fixed yoke, and the coil spring 17 mounted between the fixed yoke and the movable yoke 11.
And the brake pad 18 attached to the movable side yoke, the electromagnetic brake device is fixed to the mover.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor in which a moving element does not move even when a power source is turned off.

[0002]

2. Description of the Related Art A conventional linear motor is constructed as shown in FIGS. In the figure, reference numeral 20 denotes a belt-shaped stator made of a magnetic material, and a guide rail 21 for guiding the travel of a moving element 23 described later is provided on a side surface of the stator 20. Reference numeral 22 is a magnet fixed to the surface of the stator 20, 23 is a mover, and a laminated iron core 23 wound with a coil 24 is attached to the inner surface of the stator 20 so as to face the magnet 22 of the stator 20. The mover is provided with a roller 25 that travels on the guide rail 21. 26
Is a detector, a detector stator 27 is provided on the surface of the stator 1 along the guide rails 21, and a detector mover 28 is provided.
Is provided on the mover 23 so as to face the stator 27 of the detector.

[0003]

In the conventional mover of the linear motor, the attraction force does not work between the mover and the stator, so that when the power is turned off, the mover moves and collides with peripheral equipment. In particular, when the linear motor is installed diagonally or vertically, there is a drawback that the mover falls. For this reason, in a linear motor using a linear pulse motor, a constant current is made to flow regardless of the load to prevent movement of the mover, but since the exciting current cannot be disconnected while stopped,
There is a drawback that the linear motor generates a large amount of heat. Therefore, an object of the present invention is to provide a linear motor in which the moving element does not move even when the power is turned off.

[0004]

In order to solve the above-mentioned problems, the present invention is directed to a linear motor in which a moving body travels on a guide rail provided along a belt-shaped stator made of a magnetic material. A movable yoke that holds the guide rail and travels on the guide rail is provided, and a fixed-side yoke that is partially cut out and is arranged in parallel with the belt-shaped stator, and a leg of the fixed-side yoke. Excitation coil wound around the movable part, a movable side yoke arranged in a cutout portion of the fixed side yoke, a coil spring mounted between the fixed side yoke and the movable side yoke, and a back surface of the movable side yoke. An electromagnetic brake device including a brake pad attached to the moving element is fixed to the moving element.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a plan view of the linear motor, FIG.
Is a side view of the linear motor, FIG. 3 is a plan view of the brake device, and FIG. 4 is a sectional view taken along the line AA of FIG. FIG.
The same parts as those in No. 6 are designated by the same reference numerals and detailed description thereof will be omitted. Reference numeral 1 denotes a belt-shaped stator made of a magnetic material, a guide rail 2 having a triangular cross section is provided on a side surface thereof, and a magnet 3 is fixed to a plate surface. Reference numeral 4 denotes a moving element, which is a coil 5 wound around a laminated iron core 4a provided on the inner surface of the moving element 4.
Is attached so as to face the magnet 3 of the stator 1, and a roller 6 engaging with the guide rail 2 and having a V-shaped cross section is attached. Reference numeral 5a is a connection terminal of the coil 5. Reference numeral 7 is a detector, and the stator 8 of this detector is attached to the stator 1.
The movable element 9 of the detector is attached to the movable element 4 on the surface of the element along the guide rail 2. Reference numeral 10 denotes an electromagnetic brake device, in which a partially cutout square-shaped stationary yoke 11 is arranged parallel to the plate surface of the stator 1, and a coil 13 is wound around a leg portion 12 of the notched portion. There is. Reference numeral 14 denotes a movable side yoke formed in a flat plate shape, in which a pin 15 is planted on the plate surface, and the pin 15 is slid on the peripheral surface of a semicircular groove 16 provided on the end surface of the leg portion of the fixed side yoke 11. It is mounted so that it can move. Reference numeral 17 denotes a coil spring mounted between a spring receiver 19 attached to the fixed-side yoke 11 and the movable-side yoke 14, and is configured to press the movable-side yoke 14 against the stator 1. Reference numeral 18 is a brake pad that presses the mounting stator 1 against the back surface of the movable yoke. The electromagnetic brake device 10 thus configured is fixed to the side surface of the mover 4, and the brake pad 18 faces the surface of the stator 1. Electromagnetic brake device 10 of linear motor configured as described above
When the coil 13 is excited, the movable side yoke 14 is attracted to the fixed side yoke 11 against the spring force of the coil spring 17, and the brake pad 18 attached to the movable side yoke 14 separates from the surface of the stator 1 to brake. To release. When the coil 13 of the electromagnetic brake device 10 is demagnetized, the movable yoke 14 is separated from the fixed yoke 11 by the spring force of the coil spring 17, and the brake pad 18 attached to the back surface of the movable yoke 14 presses the surface of the stator 1. Then the brakes are applied. In this way, the electromagnetic brake device is attached to the moving element of the linear motor, the cross section of the guide rail 2 is made triangular, and the cross section of the roller engaging with the guide rail 2 is V-shaped.
When the stator is pressed by the spring force of the coil spring, the roller of the moving element engages with the guide rail 2 having a triangular cross section to prevent the moving element from rising and to apply the braking force. Although the brake pad is pressed against the surface of the stator in the elevated view, the side surface or the upper surface of the guide rail may be pressed, or the brake pad may be pressed against the roller of the moving element. Further, although it is attached to one side of the mover in the figure, it may be attached to both sides of the mover, or a plurality of electromagnetic brake devices may be attached to one side.

[0006]

As described above, according to the present invention, the movement of the moving element can be prevented with a simple structure even when the power source is turned off. In addition, the electromagnetic brake device has the stationary yoke 11 parallel to the stationary element 1. And the movable yoke is arranged in the notch of the square-shaped fixed yoke to form a flat structure, so that there is an effect that the outer dimension of the linear motor is not increased.

[Brief description of drawings]

FIG. 1 is a plan view of a linear motor showing an embodiment of the present invention.

FIG. 2 is a side view of a linear motor showing an embodiment of the present invention.

FIG. 3 is a plan view of an electromagnetic brake device according to an embodiment of the present invention.

4 is a sectional view taken along the line AA of FIG.

FIG. 5 is a plan view of a conventional linear motor.

FIG. 6 is a side view of a conventional linear motor.

[Explanation of symbols]

1 stator, 2 guardrails, 3 magnets,
4 movers, 5 coils, 6 rollers, 7 detectors, 8 stators, 9 movers 10 electromagnetic brake devices, 11 fixed side yokes, 1
2 legs, 13 coils, 14 movable side yoke, 1
5 pins, 16 grooves, 17 coil springs, 18 brake pads, 19 spring holders

Claims (1)

[Claims] 1. A linear motor in which a mover travels on a guide rail provided along a belt-shaped stator made of a magnetic material, and a mover which holds the guide rail and travels on the guide rail is provided. A fixed-side yoke that is provided with a partially cutout shape and is arranged in parallel with the belt-shaped stator, an exciting coil wound around a leg portion of the fixed-side yoke, and a cut-out of the fixed-side yoke. The mover includes an electromagnetic brake device including a movable side yoke arranged in a cutout portion, a coil spring mounted between a fixed side yoke and a movable side yoke, and a brake pad attached to the back surface of the movable side yoke. A linear motor characterized by being fixed to.