JPS5910942Y2 - step motor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a step motor that rotates intermittently due to changes in an excitation winding wound around an iron core.

Conventionally, in this type of step motor, the rotating chamber in which the rotor rotates is composed of a combination of several types of parts, and the magnetic poles are formed into a complicated shape to serve the functions of the various parts, and are further formed with screws or Since it was fixed by caulking or other means, it constituted a step mode.

These step motors have a large number of parts, making it difficult to assemble and adjust the step motor.Also, when the rotor in the rotating chamber needs to be replaced for repairs, it is difficult to replace the magnetic poles. It had the following drawbacks.

This idea was made to eliminate these drawbacks, and consists of a large diameter cylindrical body that forms the rotating chamber in which the rotor is housed, and a small diameter cylindrical body that forms the winding frame of the excitation winding. By assembling other structural parts into the integrally shaped main body, the rotor can be easily replaced, and the rotor can increase rotational torque, smooth rotation, and reduce the number of parts, making assembly and adjustment work easier. The purpose of this invention is to provide a simplified step motor.

Next, an embodiment of this invention will be described with reference to FIGS. 1 to 4.

That is, 1 is a rotor, which is composed of a rotating body 1A made of permanent magnets and a shaft 1B provided at the center of the plane of this rotating body 1A, and has N poles at positions dividing the circumferential surface of the rotating body 1A into four equal parts. and south poles are arranged adjacent to each other.

2 is a main body made of an insulating material made of, for example, a resin,
2A is a rotating chamber shaped as a large-diameter cylindrical body, and the rotor 1 is housed therein.

2B is a small-diameter cylindrical member formed of a shaft portion 2D and an edge 2E that are integrally provided continuously with the side wall 2C of the rotation chamber, that is, adjacent to the housing forming the rotation chamber 4 in the axial direction. 2F is a first through hole provided in the shaft portion 2D of the winding frame 2B, and 2G is a second through hole into which a magnetic pole (described later) is inserted.

3, the excitation winding 4 wound around the shaft portion 2D of the winding frame 2B is fitted into the first through hole 2F of the winding frame 2B formed of a magnetic material, and one side of the shaft 1B of the rotor 1 is supported. 5 is a winding part composed of a winding frame 2B integrally formed with the main body 2, an excitation winding 3 and an iron core 4, and 6 is a winding part where the other shaft 1B of the rotor 1 is A lid 8A having a supported third through hole 6A and screwed onto the main body 2 by a first screw 7
is a first magnetic pole, whose U-shaped legs are fitted into the second through hole 2G of the main body 2, and is opposed to the circumferential surface of the rotating body 1A of the rotor 1, and is connected to the iron core 4 by a second screw 9. It is screwed on.

A second magnetic pole 8B is inserted into the rotating chamber 4 so that its U-shaped legs face the circumferential surface of the rotating body 1A of the rotor 1, and is attached to the bearing portion 4A of the iron core 4.

Reference numeral 10 indicates a commutating pole which is U-shaped and is provided in proximity to the first magnetic pole 8A, passing through the lid 6. In FIG. It consists of terminals 11B and 11C that can be connected to each other.

12 is a power source connected to the switch piece 11A and the midpoint of the excitation winding 3.

Next, the operation of the step motor constructed in this way will be explained.

The switch piece 11A of the transmission switch 11 is connected to the terminal 11B,
11 C, the N and S poles of the rotor 1 are attracted to the end faces of the first and second magnetic poles 8A and 8B, and are also deflected by an angle α° under the influence of the commutative pole 10. It remains stationary in the rotated position.

When the switch piece 11A is brought into contact with the terminal 11B from this state, the excitation winding 3 is energized, and as shown in FIGS. 3 and 4, the first magnetic pole 8A facing the S pole of the rotor 1 becomes S
The second magnetic pole 8B is excited to the north pole.

Therefore, the rotor 1 is repulsed and rotated clockwise in FIGS. 3 and 4, so that the N pole of the rotor 1 becomes the S pole of the magnetic pole 8A, and the S pole of the rotor 1 becomes the N pole of the second magnetic pole 8B. It is rotated by an angle α° of 90° and remains at a position facing the pole.

Next, the switch piece 11A of the transmission switch 11 is connected to the terminal 11.
When the excitation winding 3 is separated from B, the excitation action of the excitation winding 3 is removed, the magnetic flux acting on the first and second magnetic poles 8A and 8B is extinguished, and the rotor 1 is separated from the first magnetic pole 8A and the commutating pole 10. It comes to rest at a position rotated by an angle α° due to the interaction.

Next, when the switch piece 11A is brought into contact with the terminal 11C, the S and N poles of the first and second magnetic poles 8A and 8B are N and N, respectively.
The switch piece 11A is changed to the S pole and the switch piece 11A is connected to the terminal 11B.
The rotor 1 is rotated according to the operation connected to the rotor 1.

That is, each time the switch piece 11A is brought into contact with or released from the terminals 11B and 11C alternately, the rotor 1 rotates through 90 degrees.

This invention makes it possible to incorporate the rotor, magnetic poles, etc. into the main body, which consists of a large-diameter cylindrical body that forms the rotation chamber of the rotor and a small-diameter cylindrical body that forms the winding frame of the excitation winding. The installation and removal of magnetic poles for increasing and smoothing rotational torque can be done easily, and the number of parts is reduced.
This has advantages such as ease of assembly and adjustment of the step motor.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing an embodiment of the present invention, Fig. 2 is a perspective view showing the external appearance of Fig.
With the lid removed, FIG. 1 is a plan view from the left, and FIG. 4 is an explanatory diagram of the operation of the step motor. In the figure, 1 is a rotor, 2 is a main body, 2A is a rotating chamber, 2B is a winding frame, 3 is an excitation winding, 4 is an iron core, 8A is a first magnetic pole, and 8B is a second magnetic pole. The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] An integrally formed cylindrical body having a small diameter cylindrical body around which an excitation winding is wound on the outer periphery and having a first through hole, and a large diameter cylindrical body having a rotation chamber communicating with the through hole. a main body, an iron core fitted into the through hole and having a bearing portion at one end, a first magnetic pole attached to one end of the iron core, one end of which is attached to the other end of the iron core, and the other end of which is attached to the other end of the iron core and has a bearing portion at one end; A second magnetic pole extended into the room, and a plurality of magnetic poles were arranged along the circumference, being pivotally supported by the bearing part of the iron core, and located close to the first and second magnetic poles. A step motor equipped with a rotor.