JPH10303019A - Self-hold type rotary solenoid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small bidirectional self-hold type rotary solenoid of high holding power by using a permanent magnet on a stator side. SOLUTION: Square type permanent magnets 2' are disposed on both ends of a yoke 1 forming a stator, and further a coil 10 is so disposed that a magnetic circuit is formed on the yoke 1, in this way a stator is constituted. And, a rotor 15 of a magnetic material is disposed while its rotation is allowed, and further, in both rotational directions of the rotor 15, a rotational angle stops at a wall surface 21 of the yoke 1. Thereby the rotor 15 is directly sucked- held at the wall surface 21 of the yoke 1 even when shutting a pulse conduction of the coil 10, so that a high holding power is provided. Control of the holding power is arbitrarily performed with a stop washer 19 of a non-magnetic material mounted to the wall surface 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a two-way self-holding rotary solenoid having a square or cylindrical shape.

[0002]

2. Description of the Related Art FIG. 1 shows an example of the structure of a conventional two-way self-holding type rotary solenoid. In the drawing, 1 is a magnetic yoke, 2 is a permanent magnet rotor, 3 is a nonmagnetic shaft, 4, 5 is a nonmagnetic case, 6 is a bearing, 7 is a collar, 8 is a magnetic ring, 9 is thrust washer, 10
Is a coil, 11 is a pin, 12 is a stopper pin, 13 is a stopper, 14 is a fixing screw, and 20 is a lead wire.

Next, the operation will be described. The shaft 3 fixed to the permanent magnet rotor 2 usually has a pin 11 attached to the shaft 3 due to the force of the permanent magnet rotor (2) 2 being attracted to the inner protrusion (hereinafter referred to as a wall surface) of the yoke 1. Stops against the stopper 13 and is held.

Next, when the coil 10 is energized so as to generate an opposite magnetic field, the rotor 2 of the permanent magnet rotates in the opposite direction due to a change in the magnetic field. And a permanent magnet rotor 2
The pin 11 attached to the shaft 3 fixed to the shaft 3 stops against the stopper 13 on the side of rotation, and stops even when the coil 10 is de-energized. Is held.

Next, when a positive or negative current is applied to the lead wire 20 in the opposite direction, a magnetic field opposite to the previous one is generated, and the shaft 3 fixed to the rotor 2 of the permanent magnet rotates in the opposite direction to return to the original direction. It returns to the position and is held at that position even if the power is turned off.

[0006]

However, such a conventional rotary solenoid has a weak holding force when no power is supplied. That is, since the rotor 2 of the permanent magnet is held without directly contacting the wall surface of the yoke 1, the holding force is weakened.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a two-way self-holding type rotary solenoid having a small and strong holding force in a square or cylindrical self-holding type solenoid.

[0008]

The present invention comprises a magnetic rotor and a stator having a coil and a permanent magnet arranged on a magnetic yoke so as to form a bidirectional rotating magnetic field in the rotor. When the coil is energized, the rotor repels the magnetic force of the permanent magnet to rotate to one of the walls of the yoke (3), and the rotor moves even when the coil is de-energized by the magnetic force of the permanent magnet. This is a self-holding type rotary solenoid characterized by holding a position. In addition, a non-magnetic washer is provided on the wall surface of the yoke so that the holding force of the rotor can be adjusted.

[0009]

FIG. 2 is a structural view of a two-way self-holding type rotary solenoid showing one embodiment of the present invention. In the figure, the same reference numerals as those in the conventional example indicate the same parts.

2 'is a permanent magnet provided on the fixed side, 15 is a magnetic rotor, 16 is a bobbin, 17 is a non-magnetic cover, 18 is a yoke guide, and 21 is a yoke wall surface (stop surface).

A magnetic rotor 1 fixed to a shaft 3
5 and this rotor 15 is arranged so as to surround it from outside, and a rectangular permanent magnet 2 ′ is inserted between two yokes 1 attached to the outside of the coil 10. The rotor 15 stops by the wall surface 21 of the yoke 1 serving as a stopper, and rotates at a predetermined angle. By changing the width of the rotor 15, the rotation angle can be changed.

With such a structure, the rotor 1
The gap between the magnetic circuit 5 and the yoke 1 is such that there is no gap in the magnetic circuit during the attraction, and a large holding force can be obtained when no power is supplied. For example, a 22 × 32 × 29 square bidirectional self-holding rotary solenoid is 5 kgf · cm.
Holding power can be obtained.

FIG. 3 is a diagram showing a two-way self-holding rotary solenoid according to the present invention, in which a stop washer 19 is attached to the rotor 15. (4) By changing the thickness of the stop washer 19, the holding force can be lowered and adjusted to a desired value. FIG. 4 shows a two-way self-holding type rotary solenoid of the present invention.
It is a figure showing operation at the time of rotation.

[0014]

According to the present invention, a large holding force can be obtained in a rotary solenoid which rotates a certain angle by pulse current and is self-held in two directions by a permanent magnet, so that the size of the solenoid can be reduced. . Further, since the holding force can be adjusted to an arbitrary value by changing the thickness of the stop washer, the practical use is large.

[Brief description of the drawings]

FIG. 1 is a structural view of a conventional two-way self-holding type rotary solenoid.

FIG. 2 is a structural view of a two-way self-holding rotary solenoid according to the present invention.

FIG. 3 is a structural view of a two-way self-holding rotary solenoid according to the present invention with a stop washer attached thereto.

FIG. 4 is a rotor operation diagram when the two-way self-holding type rotary solenoid of the present invention rotates.

[Brief description of reference numerals]

 DESCRIPTION OF SYMBOLS 1 Yoke 2 Permanent magnet rotor 2 'Fixed permanent magnet 3 Shaft 4 Case (1) 5 Case (2) (5) 6 Bearing 7 Collar 8 Ring 9 Thrust washer 10 Coil 11 Pin 12 Stopper pin 13 Stopper 14 Fixing screw 15 Rotor 16 Bobbin 17 Cover 18 Yoke Guide 19 Stop Washer 20 Lead Wire 21 Wall

Claims (2)

[Claims] 1. A magnetic rotor comprising: a rotor having a coil and a permanent magnet arranged in a yoke of a magnetic body so as to form a bidirectional rotating magnetic field in the rotor; A self-holding type characterized in that, by pulse current, the magnetic force of the permanent magnet is repelled to rotate to one of the wall surfaces of the yoke, and the magnetic force of the permanent magnet holds the moving position of the rotor. Rotary solenoid. 2. The self-holding rotary solenoid according to claim 1, wherein a non-magnetic washer capable of adjusting a holding force of the rotor is interposed on a wall surface of the yoke. Self-holding type rotary solenoid.