JPS6323749B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating electromagnet that can be used as a rotary solenoid or a step motor.

Conventionally, a rotary solenoid of this type as shown in FIG. 7 has been devised. In the same figure, 2
1 is a stator, 22 is a coil, and 23 is a permanent magnet rotor. By switching the direction of current in the coil 22, the rotor 23 is rotated between both stoppers 24. However, this conventional example requires a stopper, which inevitably causes collisions during operation.
It has short mechanical lifespan and bouncing due to recoil upon impact.Also, since the stator coil is located on the outer periphery of the rotor, the diameter of the rotor is small compared to the external dimensions. Therefore, it is difficult to obtain a large output torque, and due to the structure, it is not possible to obtain a large operating angle, and it is not possible to create a multi-pole structure.Also, the shape of the stator magnetic poles is complex, making it difficult to process, and the coil The disadvantages were that the storage space was small and the coil had a special shape. The present invention has been made in view of the above points, and includes a method in which a pair of stator magnetic pole pieces are opposed to each pole of a permanent magnet rotor, and excitation of the pair of magnetic pole pieces is switched from the same polarity to different polarity. The first purpose is to eliminate the need for the stopper by rotating the rotor by 90 degrees (electrical angle), and the second purpose is to simplify the structure of the stator and improve output efficiency. This is the purpose of

The present invention will be explained in detail below with reference to embodiment figures. 1st
Figures 1 and 2 show an embodiment using a two-pole rotor, in which a bearing 10 that supports a permanent magnet rotor 1 on both sides of which the NS poles are magnetized alternately on the circumference is made of magnetic material. cylindrical stator coils 4 and 5 are wound around the circumferential surfaces of both bearings 10, and flange-shaped magnetic plates 7 are arranged on both sides of each stator coil 4 and 5,
A stator magnetic pole piece 2 having an arc-shaped cross section is provided protruding from the periphery of each magnetic plate 7 in parallel with the shaft 11.
The magnetic pole pieces 2 of both stator coils 4 and 5 are arranged so as to be alternately located around the rotor 1, and a means is provided for switching the current direction of at least one of the stator coils 4 and 5. . The rotor 1 is connected to both stator coils 4 through a thrust washer 12.
The case 8 is clamped and supported by a cover plate 9 caulked to the end face of the case 8 . A bearing 10 made of a magnetic material is mounted inside the coil bobbin 6, and a shaft 11 of the rotor 1 made of a non-magnetic material passes through both stator coils 4, 5 and each magnetic plate 7 and is supported by both bearings 10. has been done. Furthermore, bearing 10
The shaft 11 also serves as the coil core, but if a non-magnetic material such as an oil-impregnated alloy is used for the inner surface, the shaft 11
A magnetic material can also be used.

FIG. 3 shows an example of the control circuit for the rotating electromagnet described above. Now, when the power switch _S1 is turned on, the direction of the current in one stator coil ₅ is set by the changeover switch S2, which is made up of a relay contact, etc. When the switch is made, the polarity of the magnetic pole piece 3 of the stator magnetic pole pieces 2 and 3 shown in FIG. 1b is switched, and the rotor 1 becomes as shown in FIG. 1c.
Rotate 90 degrees and stop. Next, when the changeover switch _S2 shown in FIG. 3 is switched back to its original state, the rotor 1 rotates in the opposite direction and returns to the state shown in FIG. 1b. Therefore, if a load is connected to the rotor shaft 11, it can be operated as a rotary solenoid. Fourth
The figure shows an example in which one stator coil 5 has two windings, and the operation of the rotating electromagnet is the same as that in FIG. 3.

The control circuit shown in Fig. 5a is for operating the rotating electromagnet of the present invention as a step motor, and is provided with changeover switches Sa and Sb for switching the direction of current in each stator coil 4 and 5, and as shown in Fig. 5b. By alternately switching both the selector switches Sa and Sb, stepwise rotation in one direction can be achieved. A similar operation can also be performed using the switches S _A to S _D shown in FIG.

Further, in the above embodiment, the rotor 1 has two poles, but if two stator magnetic pole pieces 2 are provided symmetrically protruding from each magnetic plate 7, the rotor 1
can be made into four poles, and in the same way, one with eight poles can also be constructed.

As described above, the present invention comprises a rotor made of permanent magnets whose circumferential surfaces are magnetized with different polarities alternately, a shaft that is inserted through the center of the rotor and rotates together with the rotor, and a shaft that supports both ends of the shaft. a pair of bearings made of a magnetic material, a stator coil wound around each bearing, a pair of magnetic plates each magnetically coupled to both ends of each bearing in the axial direction, and each magnetic material. The stator magnetic pole pieces are provided with stator magnetic pole pieces each protruding from the peripheral edge of the plate parallel to the shaft and disposed around the rotor, and a means for switching the current direction of at least one stator coil, and the stator magnetic pole piece is rotated. The number of stator magnetic pole pieces is twice as many as the number of magnetic poles of the rotor, and the stator magnetic pole pieces provided corresponding to each stator coil are arranged alternately and spaced apart from each other in the circumferential direction of the rotor. are opposed to the circumferential surface of the rotor over the entire length in the axial direction of the rotor, and the magnetic poles of the rotor are fixed at both ends by exciting a pair of adjacent stator magnetic pole pieces so that they have the same polarity. Since the rotor is made to stand still corresponding to the gap between the child pole pieces, the rotor can be stopped at a predetermined position without using a stopper like in conventional rotary solenoids, which eliminates friction and impact noise. This has the advantage that bouncing does not occur and almost no bouncing occurs. In addition, since the bearing is made of a magnetic material and a cylindrical stator coil is wound around the circumferential surface of the bearing, only the stator magnetic pole pieces are arranged without any coils around the rotor. The diameter of the rotor can be made larger than the overall outer diameter, which has the advantage of high torque. Furthermore, since each stator pole piece faces the entire length of the circumferential surface of the rotor in the axial direction of the rotor, a large area of the rotor facing the stator pole piece can be secured. High torque can be obtained even when it is twisted. Moreover, since the stator magnetic pole pieces face each other along the entire length of the circumferential surface of the rotor in the axial direction of the rotor, the magnetic field generated around the stator magnetic pole pieces is not unevenly distributed with respect to the rotor. This has the advantage that the rotor does not wobble in the axial direction and generates less vibration during rotation.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the rotating electromagnet of the present invention, where a is a vertical cross-sectional view, and b and c are - at a.
Figure 2 is an exploded perspective view of the same as above, Figures 3 and 4 are circuit diagrams of various embodiments of the control circuit used in the same, and Figure 5 is a cross-sectional view of the rotor. Figure a is a circuit diagram of a control circuit showing another usage, b is an explanatory diagram of its operation, Figure 6 is a circuit diagram showing another embodiment of the same control circuit, and Figures 7 a and b are FIG. 2 is a vertical cross-sectional view and a cross-sectional view of a conventional example. 1 is a rotor, 2 and 3 are stator magnetic pole pieces, 4 and 5 are stator coils, and 7 is a magnetic plate.

Claims (1)

[Claims] 1. A rotor consisting of permanent magnets whose circumferential surfaces are alternately magnetized with different polarities, a shaft inserted through the center of the rotor and co-rotating with the rotor, and a pair of magnetic bodies supporting both ends of the shaft. A bearing, a stator coil wound around each bearing, a pair of magnetic plates each magnetically coupled to both ends of each bearing in the axial direction, and a shaft and a shaft connected to each other from the periphery of each magnetic plate. The stator magnetic pole pieces are provided with parallel protruding stator pole pieces disposed around the rotor, and a means for switching the current direction of at least one stator coil, and the stator magnetic pole pieces are twice the number of magnetic poles of the rotor. The number of stator magnetic pole pieces provided corresponding to each stator coil is arranged alternately and spaced apart from each other in the circumferential direction of the rotor, and each stator magnetic pole piece is A rotating electromagnet characterized by a rotor facing the entire circumferential length of the rotor.