JP2002022572A - Dynamometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dynamometer capable of simplifying the structure of a bearing part for supporting a stator and capable of enhancing the measurement accuracy. SOLUTION: This dynamometer is equipped with a rotor 24 to which a machine to be measured is coupled, the stator 21 supported by the bearing part 29 and generating a force for rotating around the rotor 24 in consequence of the rotation of the rotor 24, and a load cell structured between a torque arm 32 integrally formed with the stator 21 and a fixed part 28. The bearing part 29 comprises at least a pair of magnets 30 and 31 disposed so that one of them embedded in the stator 21 and the other in the fixed part 28 and their same poles stand opposite to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamometer, and more particularly to a bearing structure.

[0002]

2. Description of the Related Art FIG.
It is sectional drawing which shows the structure of the conventional dynamometer shown by No. 15 in section.

In FIG. 1, reference numeral 1 denotes a stator as a swing unit of a dynamometer, which includes a frame 2 and a stationary coil 3. Reference numeral 4 denotes a rotor having a rotor shaft 5 rotatably supported at both ends of the stator 1. Reference numeral 6 denotes a bed on which a pair of bearings 7 are arranged at predetermined intervals. Each bearing 7 is formed with an arc-shaped bearing portion 8 that supports the outer periphery of the stator 1, and each bearing portion 8 is provided with a hydraulic pocket 9.

[0004] 10 is a torque arm connected to the stator 1, 11 is a load cell connected to the torque arm 10 and the bed 6, 12 is a hydraulic unit, and can supply oil to each hydraulic pocket 9 by piping 13. I have. In addition, 1
Reference numeral 4 denotes an oil film formed between the outer periphery of the stator 1 and each bearing 8 by oil supply from the hydraulic unit 12.

In the conventional dynamometer constructed as described above, the stator 1 is rotatably supported by the oil film 14.
Next, when the rotor 4 connected to the device to be measured (not shown) rotates in a predetermined direction, the stator 1 rotates between the stationary side coil 3 and the stationary coil 3 in the same direction as the rotor 4 according to Fleming's left-hand rule. The force to make it occur is generated. Since the frictional resistance of the bearing portion 8 is extremely small only due to the shearing resistance of the oil film 14, the force for rotating the stator 1 is measured with high accuracy by the load cell 11.

[0006]

Since the conventional dynamometer is constructed as described above, an oil film having a small coefficient of friction between the stator 1 and the bearing 8 in order to improve the measurement accuracy of the load cell 11. Because of the necessity of forming the hydraulic control unit 14, there is a problem in that the hydraulic unit 12 requiring extensive control must be provided.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a dynamometer capable of simplifying the structure of a bearing portion for supporting a stator and improving measurement accuracy. Aim.

[0008]

According to a first aspect of the present invention, there is provided a dynamometer which includes a rotor to which a device to be measured is connected, and which is supported by a bearing and rotates around the rotor with the rotation of the rotor. A dynamometer provided with a stator that generates a force that generates a force, and a load cell configured between a fixed portion and a torque arm formed integrally with the stator, one of the bearings is embedded in the stator and the other is mounted on the stator. It is composed of at least one pair of magnets embedded in the fixed part and arranged so that the same poles face each other.

According to a second aspect of the present invention, in the dynamometer according to the first aspect, the pole surface of the magnet is formed in a curved surface having the same radius of curvature.

A dynamometer according to a third aspect of the present invention is the dynamometer according to the first or second aspect, wherein the magnet is a permanent magnet.

A dynamometer according to a fourth aspect of the present invention is the dynamometer according to the first or second aspect, wherein the magnet is an electromagnet.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the configuration of a dynamometer according to Embodiment 1 of the present invention in cross section.
2 and 3 are cross-sectional views showing the main parts in FIG. 1 in cross section.

In FIG. 1, reference numeral 21 denotes a stator as a swing unit of a dynamometer, which includes a frame 22 and a stationary coil 23. Reference numeral 24 denotes a rotor having a rotor shaft 25 rotatably supported at both ends of the stator 21. Reference numeral 26 denotes a bed on which a pair of bearings 27 are arranged at a predetermined interval. In each bearing 27, a surface facing the outer periphery of the stator 21 is formed in an arc shape at a predetermined interval. A fixed portion 28 is formed by the bed 26 and the bearing 27, and a bearing portion 29 is formed by an opposing portion of the stator 21 and the bearing 27.

Reference numeral 30 denotes one of the bearing portions 29, for example, the bearing 27.
The magnet 31 buried in the arc-shaped portion is a magnet buried in the other of the bearing portions 29, that is, the outer peripheral portion of the stator 21.
Each of the magnets 30 and 31 has a pole surface formed into a curved surface having the same radius of curvature, and the poles are arranged to face each other. Reference numeral 32 denotes a torque arm connected to the outer periphery of the stator 21 substantially in parallel with the bed 26. A load cell 33 is arranged between the torque arm 32 and the bed 26 to detect the rotational force of the stator 21.

The dynamometer constructed as described above has a bearing 2
The stator 21 supported at 9 is rotatably supported via the air layer by the repulsive force of the magnets 30 and 31. Next, when the rotor 24 connected to the device to be measured (not shown) rotates in a predetermined direction, the stator 21 rotates in the same direction as the rotor 24 between the stationary coil 23 and the stationary coil 23 according to Fleming's left-hand rule. The force to make it occur is generated. Bearing 29
Is substantially zero due to the air layer, so that the force for rotating the stator 21 can be measured with high accuracy by the load cell 33.

Although the polarity of each of the magnets 30 and 31 has not been described in detail, as shown in FIG.
35 are buried, and the pole faces facing each other are S poles. Alternatively, as shown in FIG.
Permanent magnets 36 and 37 are buried in the first and second magnetic poles, respectively, and the opposing pole faces are set as N poles to repel each other, thereby floating the stator 21 from the bearing 27 to form an air layer.

As described above, according to the first embodiment, the bearing 29 is formed by forming an air layer between the stator 21 and the bearing 27 by the repulsive force of the permanent magnets 30 and 31 in the bearing 29. Therefore, the rotational force of the stator 21 can be detected with high accuracy without frictional resistance.

Embodiment 2 FIG. In the first embodiment, the magnets 30 and 31 are described as permanent magnets.
As shown in FIGS. 4 and 5, each of the coils 38, 39 and 4
Electromagnets 40, 41 magnetized by energizing 2, 43
, And the same effects as in the first embodiment can be obtained.

Embodiment 3 6 and 7 are cross-sectional views each showing a main part of a dynamometer according to Embodiment 3 of the present invention in cross section.

In the first embodiment, the opposing polar surfaces of the respective magnets 30 and 31 are formed in a curved shape.
As shown in FIG. 7 and FIG. 7, even if each of the magnets 46, 47 and 48, 49 is formed in a planar shape so that the stator 21 can be rotated, the same configuration as in each of the above embodiments can be applied. The effect can be obtained.

Embodiment 4 FIG. 8 and 9 are cross-sectional views each showing a main part of a dynamometer according to Embodiment 4 of the present invention in cross section.

In the second embodiment, the opposing polar surfaces of the respective magnets 40, 41 and 44, 45 are formed into curved surfaces. However, as shown in FIGS. 8 and 9, the respective magnets 50, 51 and Even if each of the pole surfaces 54 and 55 is formed in a planar shape and the stator 21 can be rotated, the same effects as those of the above embodiments can be obtained. In addition, 5
Reference numerals 2, 53, 56, and 57 denote coils that magnetize the magnets 50, 51, 56, and 57, respectively, when energized.

[0023]

According to the first aspect of the present invention, the rotor to which the device to be measured is connected and the fixed member which is supported by the bearing and generates a force for rotating around the rotor with the rotation of the rotor. In a dynamometer provided with a stator and a load cell formed between a fixed part and a torque arm formed integrally with the stator, one of the bearings is embedded in the stator and the other is embedded in the fixed part. Since it is configured with at least a pair of magnets arranged such that the poles face each other, it is possible to provide a dynamometer capable of performing highly accurate detection with a simple configuration.

Also, in the dynamometer according to claim 2 of the present invention, since the pole face of the magnet is formed into a curved surface having the same radius of curvature in claim 1, the dynamometer has a simple configuration and a high dynamometer. A dynamometer capable of detecting accuracy can be provided.

Further, the dynamometer according to claim 3 of the present invention provides a dynamometer capable of performing high-precision detection with a simple configuration since the magnet is formed of a permanent magnet in claim 1 or 2. be able to.

In the dynamometer according to claim 4 of the present invention, since the magnet is formed by an electromagnet in claim 1 or 2, it is possible to provide a dynamometer capable of highly accurate detection with a simple configuration. it can.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a dynamometer according to Embodiment 1 of the present invention in cross section.

FIG. 2 is a cross-sectional view showing a main part of the dynamometer according to the first embodiment of the present invention in cross section.

FIG. 3 is a cross-sectional view showing a main part of the dynamometer according to Embodiment 1 of the present invention, which is different from FIG. 2, in cross section.

FIG. 4 is a cross-sectional view showing a main part of a dynamometer according to Embodiment 2 of the present invention in cross section.

FIG. 5 is a cross-sectional view showing a main part of the dynamometer according to the second embodiment of the present invention, which is different from FIG. 4 in cross section.

FIG. 6 is a cross-sectional view showing a main part of a dynamometer according to Embodiment 3 of the present invention in cross section.

FIG. 7 is a cross-sectional view showing a main part of the dynamometer according to Embodiment 3 of the present invention, which is different from FIG. 6, in cross section.

FIG. 8 is a sectional view showing a main part of a dynamometer according to Embodiment 4 of the present invention in section.

FIG. 9 is a cross-sectional view showing a main part of the dynamometer according to Embodiment 4 of the present invention, which is different from FIG. 8, in cross section.

FIG. 10 is a cross-sectional view showing a configuration of a conventional dynamometer in a cross section.

[Explanation of symbols]

21 stator, 24 rotor, 28 fixing part, 29 bearing part, 30, 31 magnet, 32 torque arm, 33
Load cell, 34, 35, 36, 37 permanent magnet, 3
8, 39, 42, 43 coils, 40, 41, 44, 4
5 magnets, 46, 47, 48, 49 permanent magnets, 50,
51, 54, 55 magnets, 52, 53, 56, 57 coils.

Claims (4)

[Claims] 1. A rotor to which a device to be measured is coupled, a stator supported by a bearing, and generating a force for rotating around the rotor as the rotor rotates, and a stator integrated with the stator. In the dynamometer provided with the load cell formed between the torque arm and the fixed portion formed in the above, one of the bearing portions is embedded in the stator, the other is embedded in the fixed portion, and the same poles face each other. A dynamometer comprising at least a pair of magnets arranged so as to operate. 2. The dynamometer according to claim 1, wherein the pole faces of the magnet are formed in a curved surface having the same radius of curvature. 3. The dynamometer according to claim 1, wherein the magnet is a permanent magnet. 4. The dynamometer according to claim 1, wherein the magnet is an electromagnet.