JPH03159558A - Actuator of oscillating type - Google Patents

Abstract

PURPOSE:To reduce consumption power and simplify a driving circuit by setting a rotor formed with disc-shaped magnets having six poles formed integrally with a back yoke, and by mounting a front yoke, two hold yokes, and two air-core coils, confronted with the magnets. CONSTITUTION:A rotor 4 and a stator 8 are arranged co-axially with a shaft 1, and hold yokes 6 or air-core coils 7 fitted firmly on an upper yoke 5, and the magnets 3 of the rotor 4 are rotationally supported via a microgap 11 so that the rotor 4 may keep the microgap with a bearing 9' fitted firmly on the upper yoke 5 and a bearing 9'' fitted firmly on a case 10. Accordingly, the magnetic permeance of the slight void 11 is changed, and the rotor 4 can be oscillated.

Description

[Detailed description of the invention]

[Industrial Application Field 1] The present invention relates to an oscillating actuator that is subject to repeated rotation at a constant angle.

[Conventional technology 1 Conventional technology. An actuator used for repeated rotations at a constant angle. The Yueta used a four-phase stepping motor. [Problem to be solved by the invention 1] However, in the conventional method using a stepping motor, one layer is energized with a constant current and used as a holding mechanism, and the other layer is energized with a rectangular wave rather than a triangular wave. The problem is that not only two types of power sources are required, but also the current consumption is large and the drive circuit is complicated. The present invention is intended to solve these problems, and its purpose is to reduce current consumption and simplify the drive circuit. [Means for Solving the Problem] A disc-shaped magnet having a shaft, a back yoke made of a magnetic material held on the same axis as the shaft, and six poles integrated into the back yoke is used. A front yoke made of a magnetic material, two hold yokes made of magnetic material 4 integrated with the front yoke, and two air core coils are disposed in the axial direction of the rotor. , characterized in that an air-core coil placed opposite to the magnet is integrated by the magnet. [Embodiment 1] Figures 1 and 2 are a longitudinal cross-sectional view and a cross-sectional view taken along line A-A, showing an example of the swing type actuator of the present invention. In Figure 1, shaft 1 is . The back yoke 2 is firmly fixed to the back yoke 2 made of lifi material.
A fan-shaped magnet 3 is integrated concentrically with the shaft 1 to form a rotor 4. A pair of hold yokes 6 made of a 6N material and integrated with the upper yoke 5 are fixed to one side of the disk-shaped upper yoke 5 made of an Iitl material. The upper yoke 25 is equally spaced at 90 degrees with the hold yoke 6.
It is fixed to the stator 8 and forms the stator 8. Here, the rotor 4 and the stator 8 are disposed on the same axis as the shaft 1, and the hold yoke 6 or air core coil 7 fixed to the upper yoke 5 and the magnet 3 of the rotor 4 are arranged in a minute gap l.
The bearing 9゛ and the case 10 are fixed to the upper yoke via 1.
The rotor 4 is rotatably supported with a small gap maintained by a bearing 9'' fixed to the bearing 9'', thereby eliminating the small gap 11.
The magnetic permeance changes and the rake 4 becomes able to swing. Incidentally, the case 10 and the upper yoke 5 are firmly fixed so that the bearings 9'' and 9'' are arranged on the same axis. FIG. 3 is a layout diagram showing an example of the pole arrangement of the magnet 3. .The N.S pair of hold m-pole portions l2, which face the pair of hold yokes 6 shown in Fig. 1 with a minute gap 11 interposed therebetween, are arranged symmetrically with respect to the shaft l. On the axis 14 at 90 degrees with respect to the central axis 13 of the E′n pole, a drive magnetic pole portion l5 having opposite magnetic poles symmetrically with respect to the axis 14 and adjacent to the opposite magnetic poles on the axis l4 is attached to the shaft 1. [Effect of the Invention 1 As described above, the present invention includes a shaft, a back yoke made of a magnetic material held on the same axis as the shaft, A rotor made of a disc-shaped magnet having six poles is integrated with the back yoke, and in the axial direction of the rotor is an upper yoke made of lifI material and an upper yoke integrated with the upper yoke. Two hold yokes made of magnetic material and two air-core coils are placed facing the magnet, and the air-core coil is integrated by the magnet, reducing current consumption and simplifying the drive circuit. 4. [Brief explanation of the drawings] Figure 1 is a vertical cross-sectional view of an embodiment of the swing type actuator of the present invention. Figure 2 is a sectional view taken along line A-A in Figure 1. Figure 3 is a layout diagram showing the pole arrangement of the magnets used in Figure 1. l... Shaft 2...・・Back yoke 3・・・Magnet 4・・・Rotor 5・・・・Upper yoke 6・・・・Hold yoke 7・・・・・・・・Air core coil 8...Stator 9'.9'' Bearing 10...Case 11...More than a minute gap

Claims (1)

[Claims] A rotor consisting of a shaft, a back yoke made of a magnetic material held on the same axis as the shaft, and a disk-shaped magnet having six poles integrated with the back yoke is disposed inside, and In the axial direction of the rotor, a front yoke made of a magnetic material, and two hold yokes made of a magnetic material integrated with the front yoke;
A swing-type actuator characterized in that two air-core coils are placed facing the magnet and are integrated by a case.