JP3641346B2 - Self-holding rotary solenoid - Google Patents

Description

[0001]
BACKGROUND 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]
[Prior art]
FIG. 1 is an example of the structure of a conventional two-way self-holding rotary solenoid.
In the figure, 1 is a magnetic yoke, 2 is a permanent magnet rotor, 3 is a non-magnetic shaft, 4, 5 is a non-magnetic case, 6 is a bearing, 7 is a collar, 8 is a magnetic ring, 9 is a 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.
[0003]
Next, the operation will be described.
The shaft 3 fixed to the permanent magnet rotor 2 is usually provided with a pin 11 attached to the shaft 3 by a force by which the rotor 2 of the permanent magnet is attracted to an inner protrusion (hereinafter referred to as a wall surface) of the yoke 1. 13 is stopped and held.
[0004]
Next, when the coil 10 is energized so that the opposite magnetic field is generated, the rotor 2 of the permanent magnet rotates in the opposite direction due to the change of the magnetic field.
Then, the pin 11 attached to the shaft 3 fixed to the rotor 2 of the permanent magnet stops against the rotating stopper 13 and the rotor 2 of the permanent magnet remains on the wall surface of the yoke 1 even when the coil 10 is turned off. It is held in that position by the pulling force.
[0005]
Next, when the lead wire 20 is energized reversely, 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 reverse direction and returns to the original position. Even if the power is turned off, the position is maintained.
[0006]
[Problems to be solved by the invention]
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.
[0007]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a two-way self-holding rotary solenoid that is small and has a strong holding force in a square or cylindrical self-holding solenoid.
[0008]
[Means for solving the problems]
The present invention includes a magnetic rotor and a stator in which a coil and a permanent magnet are arranged on a magnetic yoke so as to form a bi-directional rotating magnetic field in the rotor. The self is characterized in that it is driven to rotate against one of the wall surfaces of the yoke against the magnetic force of the magnet, and the moving position of the rotor is maintained by the magnetic force of the permanent magnet even when the coil is deenergized. This is a holding type rotary solenoid. Further, a non-magnetic washer capable of adjusting the holding force of the rotor is interposed on the wall surface of the yoke.
[0009]
Embodiment
FIG. 2 is a structural diagram of a two-way self-holding rotary solenoid showing an embodiment of the present invention. In the figure, the same reference numerals as in the conventional example indicate the same parts.
[0010]
2 ′ is a permanent magnet provided on the fixed side, 15 is a magnetic rotor, 16 is a bobbin, 17 is a nonmagnetic cover, 18 is a yoke guide, and 21 is a yoke wall (stop surface).
[0011]
A magnetic rotor 15 fixed to the shaft 3 is disposed so as to surround the rotor 15 from the outside, and a rectangular permanent magnet 2 ′ is sandwiched between two yokes 1 attached to the outside of the coil 10.
The rotor 15 stops at the wall surface 21 of the yoke 1 as a stopper, and rotates at a predetermined angle.
By changing the width of the rotor 15, the rotation angle can be changed.
[0012]
By adopting such a structure, the rotor 15 and the yoke 1 are configured so that there is no gap in the magnetic circuit at the time of adsorption, and a large holding force can be obtained when no current is applied.
For example, a holding force of 5 kgf · cm can be obtained with a square two-way self-holding rotary solenoid of 22 × 32 × 29.
[0013]
FIG. 3 is a view in which a stop washer 19 is attached to the rotor 15 in the two-way self-holding rotary solenoid of the present invention.
By changing the thickness of the stop washer 19, the holding force can be lowered and adjusted.
FIG. 4 is a view showing an operation during rotation in the bidirectional self-holding rotary solenoid of the present invention.
[0014]
【The invention's effect】
A large holding force can be obtained in a rotary solenoid that rotates a certain angle by pulse energization and is self-held in two directions by a permanent magnet, so that the solenoid can be miniaturized.
Further, since the holding force can be adjusted by changing the thickness of the stop washer, the practical use is great.
[Brief description of the drawings]
FIG. 1 is a structural diagram of a conventional two-way self-holding rotary solenoid.
FIG. 2 is a structural diagram of a bi-directional self-holding rotary solenoid according to the present invention.
FIG. 3 is a structural diagram in which a stop washer is attached with the bi-directional self-holding rotary solenoid of the present invention.
FIG. 4 is a rotor operation diagram during rotation of the two-way self-holding rotary solenoid of the present invention.
[Brief description of symbols]
1 Yoke 2 Permanent Magnet Rotor 2 'Fixed Side Permanent Magnet 3 Shaft 4 Case (1)
5 Case (2)
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 surface

Claims (1)

A magnetic rotor,
A coil, two magnetic yokes attached to the outside of the coil and arranged to surround the rotor from the outside so as to form a bi-directional rotating magnetic field on the rotor, and a permanent sandwiched between the two yokes A stator provided with a magnet,
The rotor is driven to rotate against one of the wall surfaces of the two yokes by repelling the magnetic force of the permanent magnet by pulse energization of the coil, and its moving position is held by the magnetic force of the permanent magnet , A self-holding rotary solenoid, further comprising a non-magnetic stop washer capable of adjusting the holding force of the rotor .

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