JPS6338709Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reciprocating drive device that converts electrical energy used in control equipment, machine tools, recorders, etc. into reciprocating energy by electromagnetic action, and in particular to a movable permanent magnet type reciprocating drive device.

Conventionally, as shown in Figs.
There is a proposal in No. 117586 (Utility Model Publication No. 61-41429). First, in the apparatus shown in FIG. 1, two cylindrical electromagnetic coils 4 made of soft magnetic material are housed in a coil bobbin 3 so that the same polarity is generated in adjacent parts of the yoke 6. 4' is provided. Inside the electromagnetic coils 4 and 4', magnetic pole pieces 2 and 2' are placed at both ends of a cylindrical or cylindrical permanent magnet 1 which is magnetized in the axial direction so that different poles interlink with each of the coils. A movable element attached thereto is provided so as to be freely slidable in the axial direction. Here, a cylindrical sliding member 5 is fixed to the inner surface of the electromagnetic coils 4, 4', and the inner peripheral surface of the member 5 is in contact with the outer peripheral surface of the magnetic pole pieces 2, 2' of the mover. Next, in the apparatus shown in FIG. 2, the same parts as in FIG.
1' are provided in a protruding manner, and shafts 11 and 11' are supported by sleeve bearings 9 and 9' fixed to side plates 10 and 10', respectively.

As described above, in the conventional device, the sliding support part is configured by surface contact sliding, such as between the magnetic pole pieces 2, 2' and the sliding member 5, or the shaft 11, 11' and the sleeve bearing 9, 9'. There is. That is, the structure is such that contact resistance is generated to prevent movement of the movable element when the movable element slides. Of course, in order to reduce these resistances, improvements have been made such as coating sliding members with smooth Teflon (trade name), but no significant effect can be expected, and due to these contact resistances, as shown in Figure 3. This results in hysteresis X in which the forward and return lines operate on different lines, and an offset area a in which the input voltage does not operate even when an input voltage is applied, which is the biggest drawback as a control reciprocating drive device.

An object of the present invention is to eliminate the above-mentioned drawbacks and provide a movable magnet type reciprocating drive device with good controllability.

The details of the present invention will be explained below with reference to the drawings.

FIG. 4 is a longitudinal cross-sectional view showing an embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along line A-A in FIG. Note that in FIGS. 4 and 5, the same parts as in FIG. 1 are designated by the same reference numerals. In the figure, two cylindrical electromagnetic coils 4,
4' is provided. Next, inside the electromagnetic coils 4, 4', magnetic pole pieces 2, 2' are attached to both ends of the permanent magnet 1 magnetized in the axial direction, so that different poles interlink with each of the electromagnetic coils 4, 4'. A movable element formed of a movable member is disposed so as to be freely slidable in the axial direction. Here, a plurality of spherical bodies 7 made of a non-magnetic material held by a cylindrical holder 8 made of non-magnetic material are attached to the outer periphery of the permanent magnet 1. is slidably supported on the inner peripheral surface of the sliding member 5. Note that the holder 8 is configured so as not to come into contact with the inner circumferential surface of the sliding member 5 and the outer circumferential surface of the permanent magnet 1.

Next, the operation of the apparatus configured as described above will be explained. In Figure 4, the magnetic flux at the N pole of the mover is
It interlinks with the electromagnetic coil 4 through the magnetic pole piece 2 . Further, the magnetic flux of the S pole of the mover interlinks with the electromagnetic coil 4' through the magnetic pole piece 2'. Here, the electromagnetic coil 4,
When energization is applied to 4' so that a magnetic pole is generated with the illustrated polarity, a thrust force to the left of the illustrated arrow is generated between each of the above-mentioned electromagnetic coils and the interlinked magnetic flux. At this time, the movable element smoothly moves to the left because the non-magnetic spherical body 7 rolls between the inner circumferential surface of the sliding member 5 and the outer circumferential surface of the permanent magnet 1. On the other hand, if the magnetic poles generated in the electromagnetic coils 4, 4' of FIG. 4 are energized in a manner opposite to the illustrated polarity, the movable element will smoothly move to the right in the same manner as described above. In the above device, the thrust generated basically conforms to the thrust given by Fleming's left-hand rule.

Next, FIG. 6 is a longitudinal sectional view showing another embodiment of the present invention, and FIG. 7 is a sectional view taken along the line BB in FIG. In FIG. 6, the same parts as in FIG. 4 are indicated by the same reference numerals. In this device, a holder 8' made of a non-magnetic material is attached to the outer peripheral surface of the magnetic pole pieces 2 and 2', and a plurality of grooves made of a non-magnetic material are placed in a plurality of grooves formed along the axial direction of the holder. A spherical body 7 is attached. Therefore, in this device as well, when the mover moves in the axial direction in the same manner as shown in FIG. Since the spherical body 7 rolls, the mover can move smoothly.

It should be noted that configurations other than those shown in the above embodiments that satisfy the scope of the claims of the present invention are possible, and the present invention is not limited to the above embodiments.

As described above, according to the present invention, since the movable element is supported within the cylindrical yoke via the spherical body, the contact resistance when the movable element moves in the axial direction can be extremely reduced. Therefore, according to the present invention, the hysteresis and offset that occur when using a control reciprocating drive device are reduced to 1/2 to 1/2 compared to conventional ones.
This can be reduced to 1/3, resulting in a reciprocating drive device with extremely good controllability.

[Brief explanation of the drawing]

1 and 2 are vertical sectional views showing the conventional device, FIG. 3 is a voltage and displacement characteristic diagram of the conventional device shown in FIGS. 1 and 2, and FIG. 4 is the reciprocating device of the present invention. FIG. 5 is a longitudinal sectional view showing one embodiment of the drive device, FIG. 5 is a sectional view taken along line A-A in FIG. 4, FIG. 6 is a longitudinal sectional view showing another embodiment of the reciprocating drive device of the present invention, and FIG. is the 6th
It is a BB sectional view of the figure. 1: Permanent magnet, 2, 2': Magnetic pole piece, 3: Coil bobbin, 4, 4': Electromagnetic coil, 5: Sliding member,
6: Cylindrical yoke, 7: Spherical body, 8, 8': Holder.

Claims (1)

[Claims for Utility Model Registration] 1. Two cylindrical electromagnetic coils are arranged in a cylindrical yoke made of a soft magnetic material so that the same polarity occurs in adjacent parts, and the center of the cylindrical electromagnetic coil is The department includes
A movable element having magnetic pole pieces attached to both ends of a cylindrical permanent magnet magnetized in the axial direction so that different poles interlink with each of the two cylindrical electromagnetic coils is disposed so as to be movable in the axial direction. , between the movable element and the cylindrical electromagnetic coil, a plurality of movable elements that contact the outer circumferential surface of the movable element and the inner circumferential surface of the cylindrical electromagnetic coil and are movable in the axial direction by the axial movement of the movable element. A reciprocating drive device characterized by having spherical bodies rotatably provided. 2. The reciprocating drive device according to claim 1, wherein a cylindrical sliding member that contacts the spherical body is disposed on the inner peripheral surface of the cylindrical electromagnetic coil.