JPH0454321A - Electromagnetic particle type connection device - Google Patents

Abstract

PURPOSE:To eliminate a detector on the machine side and perform a torque control correctly and easily by disposing magnetic particles between a first connection body and a second connection body which are rotatable, and disposing a torque detector inside a side surface of the first connection body. CONSTITUTION:A drive member 29 of a first connection body is fixed to a drive rotation shaft 6 on the inner side of a stator 1 through a cavity. Detection coils 34, 35 are provided corresponding to magnetic layers 30, 31 fixed to the drive member 29, they are connected with a detection circuit 38, and magnetism focusing layers 36, 37 are provided. A driven member 9 of a second connection body is fixed to a driven rotation shaft 11, and magnetic particles 10 are filled in the circular cavity. The magnetic particles 10 are magnetized by a magnetic coil 2 to connect the drive member with the driven member. Changes of the magnetic permeability at the magnetic layers 30, 31 are detected by the detection coils 34, 35, and a torque is detected by the detection circuit 38. Use of a detector on the machine side is thus eliminated, and a sufficient torque control is achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electromagnetic particle type coupling device which is coupled via magnetic particles and has a built-in torque detector.

[Conventional technology]

Figure 4 shows the conventional TIFR! FIG. 2 is a sectional view of the particle type coupling device. In the figure, 1 is a stator, 2 is an excitation coil built into the stator 1, and 3 is a bracket that supports the stator.
is rotatably supported.

7 is a drive member fixed to the drive rotation shaft 6, provided inside the stator 1 through a predetermined gap, and has a U-shaped cross section and constitutes a first connecting body; 8 is an end of this drive member 7; It is a plate fixed to the section. 9 is a driven member that constitutes a second connecting body provided inside the drive member 7 through a plurality of predetermined radial annular gaps;
Reference numeral 10 denotes magnetic particles filled in the annular gap. 1
1 is a driven rotating shaft fixed to the driven member 9; 12
is a bracket that is fixed to the stator 1 and rotatably supports the driven rotating shaft 11 via bearings 13 and 14.

Next, the operation will be explained. 0 When the drive rotation shaft 6 coupled to a drive source (not shown) is rotated and the drive member 7 is rotating together with this drive rotation shaft 6, the excitation coil 2 built in the stator 1 When a current is passed through, magnetic flux (Φ) is generated as shown by the dotted line in the figure. Magnetic particles 10, which are part of the magnetic path, are connected in a chain between a rotating drive member 7 and a stationary driven member 9. Therefore, the driven member 9 is rotated, and the driven shaft 11, which is integrally connected to the driven member 9 and connected to a load side (not shown), is rotated. Then, when the current in the excitation coil 2 is cut off, the magnetic flux (Φ) disappears, the chain-like connection of the magnetic particles 10 is broken, and the driven member 9 becomes free from rotation.

Note that the transmitted torque value is approximately linearly proportional to the current value flowing through the exciting coil 2.

FIG. 5 shows a control feedback system when observing a film material using this electromagnetic particle type coupling device. In the figure, 15 is a motor that is a driving source, and 16 is a motor 1.
An electromagnetic particle type coupling device having the configuration shown in Fig. 4 is connected to the rotating shaft 5, 17 and 18 are pulleys, 19 is a belt stretched around the pulley 17.1B, 20 is a winding shaft, and 21 is a wide The film material is shown being wound around a winding shaft 20 from an unwinding side (not shown). 22 is a roller, 23.24 is a detector for detecting tension, 25 is a detector 23.24
Rollers fixed between 26, . 27 is the detector 23.2
This is a roller for applying a load (tension) in the radial direction to 4.

28 is a control device for receiving commands from the detectors 23 and 24 and changing the t-flow of the magnetic particle coupling device 16.

The rotational driving force of the motor 15 is transmitted through a particle coupling device 16, a pulley 17. Belt 19. Winding shaft 20 via pulley 18
transmitted to. As a result, the film material 21 is wound up in the direction of the arrow shown in the figure. At this time, tension is applied to the film material 21 by the rollers 26 and 27, and this tension is detected by the detectors 23 and 24.
Detected by. The control device 28 inputting detection signals from the detectors 23 and 24 controls the current of the magnetic particle coupling device 16, that is, the excitation coil 2 shown in FIG. 4, in response to the detection signals.
Controls the amount of current flowing to the

[Problem to be solved by the invention]

Since the conventional am particle type coupling device is constructed as described above, torque management or control is performed based on the value of the excitation current. Therefore, if the relationship between the excitation current and the torque changes due to product variations in the coupling device, deterioration of the magnetic particles, or changes over time, there is a problem that sufficient torque management and control cannot be performed. In addition, in order to perform sufficient torque management, a torque detector must be installed separately outside the coupling device, and in some cases rollers are also required to apply tension, making the configuration complex and expensive. There was an issue.

Further, depending on the location, it may not be possible to install a torque detector, and in this case, there are problems such as difficulty in winding up the film material etc. because the operation is performed based on a guideline.

This invention was made to solve the above-mentioned problems, and allows for easy torque detection and sufficient torque management.
The purpose of this invention is to obtain a compact and inexpensive electromagnetic particle coupling device that can be controlled.

[Means for Solving the Problems] The electromagnetic particle coupling device of the present invention incorporates a torque detector using the side surface of the first coupled living body.

[For production]

In the electromagnetic particle coupling device according to the present invention, a torque detector is mounted using the side surface of the first coupling body having a U-shaped cross section, so that an accurate torque value can be measured by the device alone. Torque management and control can be performed using the measured torque.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows a cross-sectional view of a tiff particle coupling device according to an embodiment of the present invention. Reference numeral 29 denotes a drive member which is fixed to the drive rotation shaft 6, is provided inside the stator l through a plurality of predetermined gaps, and constitutes the first connecting body having a U-shaped cross section. This replaces the drive member 7 shown in FIG. 30.31 is drive member 29
A magnetic layer made of a high-permeability soft magnetic material is fixed to the outer side surface 29a of the magnetic layer 30. The elongated rectangular magnetic layer 30 is oriented at an angle of +45° with respect to the A-axis in the radial direction in FIG. 31 are formed in the 145'' direction. These magnetic layers 30, 31 are provided, for example, at equal angular intervals over the entire circumferential direction of the side surface 29a or a portion thereof.

32 is a bracket that replaces the bracket 3 shown in FIG. 4; 33 is a drive member 29 of the bracket 32 of the cigarette;
The bobbin fixed on the side, 34.35 is magnetic 1130.3
Detection coils 36 and 37 are respectively wound around the bobbin 33 corresponding to the detection coils 1 and 34, and 37 are magnetic convergence layers provided around the detection coils 34 and 35, which are made of a high permeability magnetic material. 3
8 is a detection circuit connected to the detection coil 3435;
It is configured as shown in the block diagram shown in the figure.

Note that this detection circuit is a generally known inductance differential amplifier circuit, and its outline is shown in Figure 3.
Explanation of its contents will be omitted.

Other portions 1.2.4 to 6.8 to 140 that are the same as those in FIG. 4 are the same as those in the conventional device, so their explanations will be omitted.

Next, the operation of this embodiment will be explained mainly with reference to FIG. By passing current through the excitation coil 2, the magnetic flux (Φ
) is generated as shown by the broken line in the figure, the magnetic particles 10 are magnetized and connected in a chain between the drive member 29 and the driven member 9, and the drive member 29 and the driven member 9 are dynamically connected. As a result, power is transmitted from the driving rotation shaft 6 to the driven rotation shaft 11. Regarding such operations, there is no difference from conventional devices. Here, in a connected state where power is transmitted, a torque corresponding to the power transmission is applied to the side surface 29a of the drive member 29, and bow tension is generated in one of the magnetic layers 30, 31, and compressive force is generated in the other. Force is generated and distortion occurs. When this strain occurs, the magnetic layer 3
The magnetic permeability of 0.31 changes, and the magnetic permeability changes in opposite directions in the case of tensile force and the case of compressive force. Detection coil 34.3
5 detects this change in magnetic permeability as a change in magnetic impedance, and the detection circuit 3 differentially amplifies the output of each detection coil 3435 and generates a detection voltage according to the amount of strain, that is, torque, on the side surface 29a of the drive member 29. Output.

As described above, in this embodiment, the detection coils 34.35 are disposed between the side surface 29a of the drive member 29, which was conventionally spaced, and the bracket 32, and the magnetic layer 34.35 is disposed on the outer peripheral surface of the side surface 29a of the drive member 29. .31 is fixed, so even if this torque detector is incorporated, the overall size of the device will not be increased.

Therefore, there is no need to attach a detector to the machine as shown in the conventional device, and even in places where a detector cannot be attached, 1 is installed inside the magnetic particle coupling device, making torque control easier and making the machine cheaper. In addition, it becomes possible to accurately wind up the film material, etc.

Note that the magnetic layer may be a soft magnetic amorphous metal,
It may also be made of a high magnetostrictive material formed by electroless plating.

Moreover, although the torque detector has been described as a magnetostrictive type torque detector, it may be one that uses another torque detection method such as a phase difference type or a strain gauge type.

Further, in the above embodiment, a clutch device has been described as a w magnetic particle type coupling device, but the same applies to a brake device, and in this case, the driven rotor may be fixed.

〔Effect of the invention〕

As described above, according to the present invention, the first
Since the torque detector is built into the electromagnetic particle coupling device by utilizing the side of the coupling body, the conventional detector on the machine side is no longer necessary, and it can be used even in places where it is impossible to install a detector.
Torque detection becomes possible, and there is an effect that sufficient torque management or torque control can be performed in a small size and at low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a single magnetic particle coupling device according to an embodiment of the present invention, FIG. 2 is a partial side view of the device shown in FIG. 1,
FIG. 3 is a front view showing a detection circuit, etc., FIG. 4 is a sectional view showing a conventional device, and FIG. 5 is a perspective view showing an example of the configuration of a winding system using the conventional device. In the figure, 1... stator, 2... excitation coil, 6...
- Drive rotating shaft, 9... Driven member, 10... Magnetic particle, 11... Driven rotating shaft, 29... Drive member,... Side surface,... Magnetic layer, 2... Brakent 5...Detection coil. In addition, the same symbols in the figures do not indicate the same or equivalent parts.

Claims (1)

[Claims] A first connecting body having a substantially U-shaped cross section and rotatably provided; a second connecting body disposed so as to be connectable to the first connecting body; In the electromagnetic particle coupling device, the electromagnetic particle coupling device includes magnetic particles filled between the two coupling bodies, and a coil that magnetizes the magnetic particles and applies a transmission torque between the first and second coupling bodies. An electromagnetic particle coupling device characterized by having a built-in torque detector using the side surface of the coupling body.