JPH0984324A - Reciprocating rotary actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to hold a rotor at both dead points without supplying power by a constitution that the distance between adjacent different polarity poles on the rotor is equal to the distance between the two poles of a stator and the centers of the rotor poles is deviated in the rotating direction from the centers of the corresponding stator poles when the rotor is at the dead points. SOLUTION: A cylindrical rotor 6 made of a permanent magnet is used as a driven element, a cutout 7 is formed in a desired length partly on the outer periphery, a rod-like stopper 8 is engaged, both the ends of the cutout 7 are magnetized at N-poles, the outer peripheries of the opposed rotors 6 are magnetized at S-poles, and hence totally three poles are provided. A stator 1 is alternately excited at positive and negative by DC flowing at a stator winding 2 to dipoles, and the distance between the dipoles is brought into coincidence with the N-pole and S-pole of the rotor 6. A stopper 8 is operated at either the end face of the cutout 7 at both the dead point positions of the reciprocating rotation of the rotor 6, and the centers of the poles of the rotor 6 are deviated in the rotating direction from the centers of the poles of the opposed stator 1. As a result, the non-conducting state can be maintained as it is at both the dead point positions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating rotary actuator that provides a reciprocating rotary force.

[0002]

2. Description of the Related Art A rotary solenoid is generally used as a method for obtaining reciprocating rotary motion. The reciprocating motion is performed by using the attraction force of the solenoid at the time of forward movement and the restoring force of an attached coil spring at the time of return. I am making

FIG. 18 shows a conventional reciprocating rotary actuator, in which 1 is a stator, 2 is a stator winding, 3 is a rotor, 4 is a rotation axis thereof, and 5 is a restoration connected to one end of the rotor 3. It is a coil spring for.

[0004]

However, in the above-mentioned conventional device, there is a difference in rotational force between the forward and backward directions, and the life of the spring is shortened due to the settling of the spring, which causes a problem in reliability.

When it is necessary to maintain the reciprocating motion at both dead points, it is necessary to continue energizing at one dead point.
It cannot be used for applications that require holding at both dead points without power supply.

The present invention eliminates the above drawbacks.

[0007]

SUMMARY OF THE INVENTION A reciprocating rotary actuator of the present invention is a two-pole stator which is excited by alternating current in a positive and negative polarity, and three different poles on the outer periphery thereof which are alternately spaced from each other. The permanent magnet rotor and the stopper arranged to be engageable with the rotor at the dead center position of the reciprocating rotation,
The distance between adjacent different poles of the rotor is equal to the distance between the two poles of the stator, and at the dead center position of the rotor, the center of each magnetic pole of the rotor corresponds to each pole of the rotor. It is displaced in the direction of rotation from the center of.

Further, the reciprocating rotary actuator of the present invention is
A three-pole stator excited by alternating positive and negative currents with DC, a permanent magnet rotor magnetized with three different poles spaced apart from each other on its outer periphery, and the reciprocating rotation of the rotor. And a distance between adjacent different poles of the rotor equal to a distance between adjacent poles of the stator, and the rotor at a dead center position of the rotor. The center of each magnetic pole is displaced in the rotational direction from the center of the corresponding pole of the rotor.

The rotor for the stator is an inner rotor type.

The rotor with respect to the stator is an outer rotor type.

The rotor relative to the stator is of the axial rotor type.

In the reciprocating rotary actuator of the present invention, reciprocating rotation of the rotor, which is the driven body, can be obtained by exciting the stator winding with positive and negative alternating current.

The rotor is held in a non-energized state at the positions of both dead points.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIG. 1, a permanent magnet cylindrical rotor 6 is used as a driven body, and a notch 7 is formed on a part of the outer periphery of the rotor 6 over a desired length. ,
A rod-shaped stopper 8 is engaged with the notch 7, and both ends of the notch 7 of the rotor 6 are magnetized to one of the N and S poles, for example, the N pole, and rotated to face the notch 7. The outer peripheral portion of the child 6 is magnetized to the other of the N and S poles, for example, the S pole so as to have a total of 3 poles.

Further, the stator 1 has two poles which are positively and negatively excited by a direct current flowing through the stator winding 2, and the distance between the two poles is matched with the N pole and the S pole of the rotor 6. If it's time to do it, close it.

Further, the stopper 8 is brought into contact with either one of the end faces of the notch 7 at both dead center positions of the reciprocating rotation of the rotor 6 so as to act as a stopper.

At the dead center position of the rotor 6, the center of each magnetic pole of the rotor 6 faces the stator 1.
It should be offset from the center of each pole in the direction of rotation.

FIG. 2 is a development view for explaining the operation of the reciprocating rotary actuator of the present invention shown in FIG.

FIGS. 3 and 4 show another embodiment of the reciprocating rotary actuator of the present invention. In this embodiment, the stator 1 is divided into 1A, 1B and 1B at three positions corresponding to the three poles of the rotor 6. Then, the stator windings 2 respectively excite the magnets into, for example, N, S, S, and three poles.

Reference numeral 9 indicates a rotor shaft, and 10 and 11 indicate bearings thereof.

5 and 6 show states in which the rotor 6 starts counterclockwise rotation and clockwise rotation, respectively, and θ is the rotation angle of the rotor 6.

The stator winding 2 is a single winding (unifilar winding) or a multiple winding (bifilar winding).
Can be done.

FIG. 7 shows the relationship between the time t and the drive current passed through the stator winding 2. A is the non-excitation state, B is the (+) excitation state, and C is the (-) excitation state.

8 to 10 are explanatory views of the relationship between the positional relationship between the stator and the rotor and the moving force in the reciprocating rotary actuator shown in FIG. 1, and FIG. 8 shows the holding force of the rotor in the non-excitation state. T _D and its orientation, Fig. 9 is the holding force in the case of exciting the stator T _H and its orientation, Fig. 10 represents the force T _T and its direction of the holding force T _D and T _H.

11 to 17 are explanatory views of the relationship between the set positions of the rotor and the stopper with respect to the stator, and the holding force T _D and the resultant force T _T when the rotor is held or moved.

The magnitude and direction of the holding force represent the magnitude and direction of the force when the S pole at the center of the three poles of the rotor is displaced.

[0028]

As described above, according to the reciprocating rotary actuator of the present invention, the rotor can be held in the non-energized state at the dead center positions thereof without using the spring for restoration. Due to the deviation between the stator poles and the rotor magnetic poles, a moving torque in the direction of deviation is generated, and the rotor is very easily driven by arbitrarily selecting the polarity and timing of the drive current flowing through the stator winding 2. There are various advantages such as setting the hold position arbitrarily.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a reciprocating rotary actuator of the present invention.

FIG. 2 is a development view for explaining the reciprocating rotary actuator shown in FIG.

FIG. 3 is a vertical sectional front view of another embodiment of the reciprocating rotary actuator of the present invention.

FIG. 4 is a cross-sectional plan view of another embodiment of the reciprocating rotary actuator of the present invention.

FIG. 5 is a vertical sectional side view of another embodiment of the reciprocating rotary actuator of the present invention.

FIG. 6 is a vertical sectional side view of another embodiment of the reciprocating rotary actuator of the present invention.

FIG. 7 is an explanatory diagram showing a relationship between a time t and a drive current supplied to a stator winding in the actuator of the present invention.

8 is a diagram illustrating the relationship between the positional relationship between the stator and the rotor and the moving force in the reciprocating rotary actuator shown in FIG.

9 is a diagram illustrating the relationship between the positional relationship between the stator and the rotor and the moving force in the reciprocating rotary actuator shown in FIG.

10 is an explanatory diagram of a positional relationship between a stator and a rotor and a moving force in the reciprocating rotary actuator shown in FIG.

FIG. 11 is a diagram for explaining the relationship between the setting positions of the rotor and the stopper with respect to the stator and the holding and moving of the rotor.

FIG. 12 is a diagram for explaining the relationship between the setting positions of the rotor and the stopper with respect to the stator and the holding and moving of the rotor.

FIG. 13 is a diagram for explaining the relationship between the set positions of the rotor and the stopper with respect to the stator and the holding and moving of the rotor.

FIG. 14 is a diagram for explaining the relationship between the setting positions of the rotor and the stopper with respect to the stator, and the holding and moving of the rotor.

FIG. 15 is a diagram for explaining the relationship between the setting positions of the rotor and the stopper with respect to the stator, and the holding and moving of the rotor.

FIG. 16 is a diagram for explaining the relationship between the setting positions of the rotor and the stopper with respect to the stator and the holding and moving of the rotor.

FIG. 17 is a diagram for explaining the relationship between the setting positions of the rotor and the stopper with respect to the stator and the holding and moving of the rotor.

FIG. 18 is an explanatory diagram of a conventional reciprocating rotary actuator.

[Explanation of symbols]

 1 Stator 2 Stator Winding 3 Rotor 4 Rotating Shaft 5 Restoring Coil Spring 6 Rotor 7 Notch 8 Stopper 9 Rotor Shaft 10 Bearing 11 Bearing

Claims (5)

[Claims] 1. A two-pole stator excited with alternating positive and negative currents with DC, a rotor of a permanent magnet magnetized with three different poles alternately spaced apart from each other on its outer periphery, and a rotor. The stopper is disposed so as to be engageable at the dead center position of the reciprocating rotation, and the distance between adjacent different poles of the rotor is equal to the distance between the two poles of the stator, and at the dead center position of the rotor. A reciprocating rotary actuator characterized in that the center of each magnetic pole of the rotor is deviated in the rotational direction from the center of each corresponding pole of the rotor. 2. A three-pole stator excited by alternating positive and negative currents with a direct current, a rotor of a permanent magnet whose outer periphery is magnetized with three different poles alternately separated from each other, and the rotor. The stopper is disposed so as to be engageable at the dead center position of the reciprocating rotation, and the distance between adjacent different poles of the rotor is equal to the distance between adjacent poles of the stator, and the dead center position of the rotor is In the reciprocating rotary actuator, the center of each magnetic pole of the rotor is deviated from the center of each corresponding pole of the rotor in the rotational direction. 3. The reciprocating rotary actuator according to claim 1, wherein the rotor with respect to the stator is an inner rotor type. 4. The reciprocating rotary actuator according to claim 1, wherein the rotor with respect to the stator is an outer rotor type. 5. The reciprocating rotary actuator according to claim 1 or 2, wherein the rotor with respect to the stator is an axial rotor type.