JPH0550989U - Stepping motor - Google Patents

Abstract

(57) [Summary] [Purpose] By devising the length of multiple terminals, the size of the device to be embedded can be made as small as possible.
Another drawback is to eliminate the conventional drawback by adopting another adjusting means in place of the rotation adjusting hole. [Structure] When projecting three or more terminals in the radial direction from the motor body, the terminal length is set to a length within a concentric circle with the tip of the center-side terminal, and rotation adjustment is performed within the concentric circle to a position different from the terminal mounting position. The projections for the motor are provided on the motor body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a terminal portion of a stepping motor and an operation portion for adjusting rotation.

[0002]

[Prior Art]

 There is a strong demand for miniaturization of head drive stepping motors to reduce the size and thickness of office electrical equipment, especially floppy disk drive devices. In the case of a stepping motor for driving the head of a lead screw type, the home position is adjusted with the stepping motor incorporated in the drive device. As means for adjusting the origin position, there are a method of moving the motor body in the axial direction and a method of rotating the motor body around the shaft. In the rotation adjustment method, the rotation radius of the terminal portion is a dimensional limitation, which is an obstacle to making the floppy disk drive device smaller and thinner.

1 and 2 show the structure of a conventional stepping motor 10. For example, a lead screw type shaft 1 is rotatably supported at a central position of a motor body 2. An insulating terminal support 4 is fixed to the side surface of the motor body 2, and four terminals 3 of the same length are fixed to the side of the motor main body 2 in a state of protruding in the radial direction, for example. Here, the radius R of the smallest concentric circle C that surrounds all the terminals 3 from the rotation center O of the motor body 2 is the tip of the terminals 3 at both ends.

Therefore, when the rotation adjustment is performed, the size required for the device 7 to be incorporated such as the floppy disk drive device, for example, the height H must be twice or more the radius R. If not, part of the terminals 3 will protrude from the device 7 after the rotation adjustment. In this way, the lengths of the terminals 3 at both ends limit the dimensions such as the height H of the device 7.

Further, two rotation adjusting holes 5 are provided on the back side of the motor main body 2 along the diametrical direction. When the rotation is adjusted, the pin 9 of the jig 8 is inserted into the hole 5, By rotating the jig 8, the mounting position of the stepping motor 10 is adjusted. In the case of the stepping motor 10 having a relatively large outer dimension, there is no problem in providing the rotation adjusting hole 5 in the motor body 2, but as the size becomes smaller, it is difficult to provide the hole 5 due to space restrictions. Since the hole 5 is also small, there is a problem in this method in view of the mechanical strength of the jig 8 for rotation adjustment.

[0006]

[Problems of the prior art]

 As described above, in the conventional stepping motor 10, the size of the device 7 to be assembled is restricted by the lengths of the plurality of terminals 3, and the formation of the hole 5 for rotation adjustment and the operation space of the jig 8 are not possible. From the point of securing, it is a big obstacle to miniaturization of the device 7.

[0007]

[The purpose of the device]

 Here, the object of the present invention is to reduce the size of the device 7 to be incorporated as much as possible by devising the lengths of the plurality of terminals 3, and to replace the hole 5 for rotation adjustment with another adjustment. By adopting the means, it is to eliminate the conventional drawbacks.

[0008]

[Means for solving the problem]

 To achieve the above object, the present invention sets the terminal length within the concentric circle with the tip of the center-side terminal when projecting three or more terminals in the radial direction from the motor body, and mounting the terminals within the concentric circle. A protrusion for rotation adjustment is provided on the motor body at a position different from the position.

[0009]

【Example】

 3 and 4 show the configuration of the stepping motor 11 of the present invention. Similar to the conventional one, the shaft 1 is rotatably supported with respect to the center position of the motor body 2, and three or more, for example, four terminals 3 are attached to the side surface of the motor body 2. The terminal support portion 4 is provided so as to project in the radial direction. Here, the two terminals 3 on the center side are set to have appropriate lengths for connecting the electric wires, and the lengths of the two terminals 3 on both ends are the rotation center O of the motor main body 2. Is set as a length that can be accommodated inside a concentric circle C having a radius R and passing through the tip of the terminal 3 on the center side. In addition, a protrusion 6 for rotation adjustment is formed in the concentric circle C on the side surface of the motor main body 2 at a position different from these terminals 3.

The plurality of terminals 3 and the protrusions 6 are formed by utilizing a part of the steel plate 13 in the process of punching the yoke 12 from the strip-shaped steel plate 13, as shown in FIG. The yoke 12 and the plurality of terminals 3 are formed by punching punched portions 14 and 15 from a strip-shaped steel plate 13 by press working. At this time, the annular yoke 12 has a plurality of pole teeth 16 at its center portion. It is formed integrally and is connected to the steel plate 13 by the connecting portions 17 and 18. In this state, a plastic bobbin 19 surrounds the yoke 12 and is integrated with it by insert molding, as shown by the chain double-dashed line. At this time, the bobbin 19 partially forms the terminal support portion 4. As a result, the terminal 3 is fixed in the embedded state by the terminal supporting portion 4. Then, the tip of the terminal 3 and the connecting portions 17 and 18 are cut along the cut lines 20 and 21 on the outer side of the bobbin 19, and the yoke 12 and the bobbin 19 integral with the yoke 12 are taken out from the steel plate 13. In this way, the protrusion 6 for rotation adjustment is formed integrally with the yoke 12.

Since the plurality of terminals 3 are centered on the rotation center O of the motor main body 2 and are housed within the concentric circle C at the tip of the terminal 3 on the center side, during the rotation adjustment after the stepping motor 11 of the present invention is assembled, The terminal 3 does not project to the outside of the concentric circle C with the motor body 2, and the dimension of the device 7, for example, the height H is not restricted by the length of the terminal 3 on the outside, and the size of the device 7 can be reduced accordingly.

Further, since the protrusion 6 for rotation adjustment is formed inside the concentric circle C at a position different from the terminal 3 on the side surface of the motor main body 2, the protrusion 7 is incorporated into the device 7 intended for rotation operation. Since it does not affect the dimensions of the motor, and there are no restrictions on the hole formation and hole formation position with respect to the motor body 2, there is no deterioration in the function of the motor, and the motor body does not need to use a special jig 8 or the like. The rotation position adjustment of 2 becomes easy.

[0013]

[Other Examples]

 In the above embodiment, the terminal supporting portion 4 is formed as a surface parallel to the tangential direction of the outer surface of the motor body 2, but in the embodiment of FIG. 6, the terminal supporting portion 4 is formed along the outer peripheral surface of the motor body 2. This is an example in which the portion 4 is formed as a circumferential surface. By doing so, the protruding length of the terminal 3 at the outer end can be made substantially the same as that at the center, so the workability of soldering is improved, and the electrical connection between the terminal 3 and the wire after soldering is improved. The credibility of the relationship is improved. The terminals 3 may not be integrally formed with the yoke 12 but may be fixed to the insulating terminal support portion 4 by means such as press fitting.

[0014]

[Effect of the device]

 The present invention has the following advantages. The length of the terminal is regulated so that it fits in a concentric circle that passes through the tip of the terminal on the center side around the center of rotation when adjusting the rotation of the motor body. Does not project outside inside the device to be embedded, and the size of the device to be embedded can be reduced accordingly. In addition, since the protrusions for rotation adjustment are formed in the concentric circles at positions different from these terminals, holes that pose a functional problem for the motor are not required, and there is no need for a jig installation space or operation space. It is not required, and the stepping motor can be installed in a small space, and the subsequent rotation adjustment can be easily performed without using a jig from the outside.

[Submission date] July 24, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

[Prior Art]

There is a strong demand for miniaturization of head drive stepping motors to reduce the size and thickness of office electrical equipment, especially floppy disk drive devices. In the case of a stepping motor for driving the head of a lead screw type, the home position is adjusted with the stepping motor incorporated in the drive device. As a method of adjusting the origin position, there is a method of rotating the motor body around the shaft. In the rotation adjustment method, the radius of rotation of the terminal part is a dimensional constraint, which is an obstacle to making the floppy disk drive device smaller and thinner.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

The plurality of terminals 3 and the protrusions 6 are formed by utilizing a part of the steel plate 13 in the process of punching the yoke 12 from the strip-shaped steel plate 13, as shown in FIG. The yoke 12 and the plurality of terminals 3 are formed by punching the punched portions 14 and 15 from the strip-shaped steel plate 13 by press working. At this time, the annular yoke 12 has a plurality of pole teeth 16 at the center portion. It is formed integrally and is connected to the steel plate 13 by the connecting portions 17 and 18. Since the connecting portion is provided in order Prefer not steel 13 convex yoke 12, connecting portion 17 may be omitted. In this state, a plastic bobbin 19 surrounds the yoke 12 and is integrated with it by insert molding, as shown by the chain double-dashed line. At this time, the bobbin 19 partially forms the terminal support portion 4. As a result, the terminal 3 is fixed in the embedded state by the terminal support portion 4. After that, the tip of the terminal 3 and the connecting portions 17 and 18 are cut along the cut lines 20 and 21 at the outer portion of the bobbin 19, and the yoke 12 and the bobbin 19 integral with the yoke 12 are taken out from the steel plate 13. In this way, the protrusion 6 for rotation adjustment is formed integrally with the yoke 12.

[Brief description of drawings]

FIG. 1 is a rear view of a conventional stepping motor.

FIG. 2 is a side view of a conventional stepping motor.

FIG. 3 is a rear view of the stepping motor of the present invention.

FIG. 4 is a side view of the stepping motor of the present invention.

FIG. 5 is a plan view of a process of forming a terminal and a protrusion according to an embodiment of the present invention.

FIG. 6 is a rear view of a stepping motor according to another embodiment of the present invention.

[Explanation of symbols]

 1 axis 2 motor body 3 terminal 6 protrusion for rotation adjustment 10 conventional stepping motor 11 stepping motor of the present invention

Claims (1)

[Scope of utility model registration request] 1. In a stepping motor in which three or more terminals project radially from a motor body, the terminal length is set to a length within a concentric circle with the tip of the center-side terminal, and at a position different from the terminals within the concentric circle. A stepping motor having a protrusion for rotation adjustment.