JPH0562179U - Rotating solenoid - Google Patents

Abstract

(57) [Summary] [Purpose] Effectively apply magnetic force without increasing the shape,
Therefore, the size is small and the efficiency of the rotating torque is improved. [Structure] The tips of a pair of core portions 20 in the central portion of the core portion 6 of an annular laminated stator are bent up and down to form bent portions 21, which serve as magnetic pole portions for the rotor.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary solenoid suitable for use in an actuator for hydraulic switching that varies the damping force of a shock absorber of an automobile.

[0002]

[Prior Art]

 This type of rotary solenoid is generally attached integrally to a rotary shaft 3 rotatably supported by a bearing portion of a case (not shown) as shown in FIGS. 3 and 4, and has a permanent magnet having a plurality of magnetic poles on its peripheral surface. A rotor 2 made of a magnet, a plurality of laminated stators 5 each having a plurality of core portions 6 formed in an annular shape and protruding in the center direction, and a plurality of laminated stators 5, and a coil on each core portion 6 of the laminated layer stators 5. A plurality of coil winding parts 7 around which a coil is wound, and each coil fixed to the surface of the uppermost stator of the laminated stator 5 and connected to a coil derivation part (not shown) derived from the coil winding part 7. It is generally composed of a terminal board 8. Then, by supplying an electric current to each coil, the tip end portion 6a of each core portion 6 functions as a magnetic pole portion, and a force of attraction and repulsion is applied to the rotor 2, and as a result, a rotational torque is applied to the rotor 2. ing.

By the way, in order to give a sufficient rotational torque to the rotor 2, the height H of the magnetic pole portion 6a of the core 6 is set sufficiently corresponding to the rotor length L of the rotor 2, and the magnetic force of the rotor 2 is set. On the other hand, it is necessary to effectively apply the magnetic force of the magnetic pole portion 6a on the stator side. Therefore, in the prior art, as shown in FIG. 5, the thickness of the core portion 6 is increased and the number of laminated stators 5 is increased so that the rotor length L and the height H ₁ of the magnetic pole portion 6a are substantially equal. 6, or as shown in FIG. 6, the magnetic pole stators each having a bent portion 10a of height H ₁ which is vertically bent at the tip of the core portion 10 are stacked above and below the laminated stator 5, There is one in which the curved portion 10a is made to function as the magnetic pole portion of the core portion 10 and the magnetic pole surface is brought close to the rotor 2.

[0004]

[Problems to be solved by the device]

 However, when the structure in which the thickness of the core portion 6 is increased as in the first example described above, the thickness of the laminated stator 5 is increased accordingly, and the coil winding portion 7 wound around the core portion 6 is also increased. Since the thickness of the rotary solenoid also becomes thicker, there is a drawback that the entire rotary solenoid becomes larger. Further, if the structure in which the stators for magnetic poles are stacked above and below the laminated stator 5 as in the second example, the above-mentioned disadvantage that the entire rotary solenoid becomes large is solved, but the core portion 6 of the laminated stator 5 is eliminated. Has a structure in which the core end surface 6a of the rotor 2 is close to the peripheral surface of the rotor 2, and therefore, the air gap between the peripheral surface of the rotor 2 and the core end surface 6a varies, which causes variation in the rotational torque. There's a problem.

Therefore, the present invention has been made in view of the above-mentioned conventional drawbacks and problems, and an object thereof is to effectively use a magnetic force without increasing the shape. , And to provide a rotary solenoid that is small in size and has improved rotary torque efficiency.

[0006]

[Means for Solving the Problems]

 In order to achieve this object, a rotary solenoid according to the present invention comprises a rotor composed of a permanent magnet having a plurality of magnetic poles, and a plurality of rotors arranged in a laminated state around the rotor and projecting toward the center of the rotor. A rotary solenoid comprising an annular laminated stator having a core portion and a plurality of coil winding portions each having a coil wound around each core portion of the laminated layer stator, wherein a core is provided in a central layer of the laminated stator. The tip of each part is provided with a bent part which is bent in the vertical direction.

[0007]

[Action]

 In the present invention, only the bent portion of the magnetic pole stator functions as the magnetic pole portion, and by increasing the surface area of this magnetic pole portion, the magnetic force of the magnetic pole portion and the magnetic force of the rotor effectively act, and the bent portion The part maintains a uniform air gap with the peripheral surface of the rotor.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an essential part of a rotary solenoid according to the present invention. In the figure, the feature of the present invention is that a pair of core portions 20 in the central layer of the laminated core portion 6 of an annular laminated stator (not shown) are bent up and down to form bent portions 20a. It is in the point provided. Therefore, the end surface of the other core portion 6 is shielded by the bent portion 21, and only the surface 21a of the bent portion 21 is close to the peripheral surface of the rotor (not shown).

In other words, the surface 21a serves as a magnetic pole surface for the rotor, and the height H ₁ of the pair of magnetic pole surfaces 21a is made equal to the rotor length L of the rotor 2 described above, whereby the magnetic force of the rotor 2 is increased. On the other hand, the magnetic force of the magnetic pole surface 21a on the stator side can be effectively applied. Further, since only the magnetic pole surface 21a is close to the peripheral surface of the rotor, the air gap between them is kept constant, whereby the rotational torque generated by the magnetic force does not fluctuate and the efficiency is improved. The rotational torque can be obtained by Since these can be achieved by forming the height H ₁ of the bent portion 21 to be equal to or slightly larger than the rotor length L of the rotor 2, the thickness between the cores 6 should be minimized. This results in a small rotating solenoid.

FIG. 2 is a perspective view of an essential part of another embodiment of the present invention. In this embodiment, the width W of the bent portion 21 is widened in an arc shape along the circumferential direction of the rotor 2. With such a structure, the magnetic force of the magnetic pole surface 21a can be more effectively acted and a more efficient rotational torque can be obtained without increasing the thickness direction of the rotary solenoid.

[0011]

[Effect of the device]

 As described above, according to the present invention, the tip of the core portion is formed on the central layer of the annular laminated stator having a plurality of core portions arranged in a laminated state around the rotor and projecting toward the center of the rotor. Since each has a bent part that is bent in the vertical direction, the bent part can function as a magnetic pole part, and by increasing only the surface area of this bent part, the magnetic force of the rotor is increased. On the other hand, the magnetic force of the bent portion can be effectively applied, and moreover, the air gap between the peripheral surface of the rotor and the bent portion of the magnetic pole stator can be made uniform. There is an effect that the interlinkage magnetic flux between the magnetic poles of the rotor and the stator is increased without increasing it, and the torque of the rotor can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of a rotary solenoid according to the present invention.

FIG. 2 is a perspective view of an essential part showing a second embodiment of the rotary solenoid according to the present invention.

FIG. 3 is an exploded perspective view of a general rotary solenoid.

FIG. 4 is a perspective view of an essential part of FIG.

FIG. 5 is a perspective view of a main part of a conventional rotary solenoid.

FIG. 6 is a perspective view of a main part of a second example of a conventional rotary solenoid.

[Explanation of symbols]

 2 rotor 5 laminated stator 6 core part 7 coil winding part 21 bent part

Claims (1)

[Scope of utility model registration request] 1. A rotor comprising a permanent magnet having a plurality of magnetic poles, and an annular laminated stator having a plurality of core portions arranged in a laminated state around the rotor and projecting toward the center of the rotor. In a rotary solenoid comprising a plurality of coil winding parts in which coils are wound around each core part of the laminated stator, a bending part in which the tip of the core part is bent in the vertical direction is formed in the central layer of the laminated stator. A rotary solenoid that is provided.