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Torque detection sensor

A technology of torque detection and sensors, which is applied in the direction of torque measurement, instruments, measuring devices, etc., and can solve the problems of large sensors and increased processing costs

Inactive Publication Date: 2022-01-18
SHINANO KENSHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, since the detection coil and the core need to be buried using the radial thickness of the insulating cylinder, the sensor tends to be enlarged in the radial and axial directions
In addition, since the end surfaces of the legs on both sides constituting the core are set to face the object to be detected, it is necessary to form the end surfaces into an arc-shaped curved surface rather than a flat surface, which increases the processing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] image 3 A magnetic circuit formed by energizing the first energization circuit 6 a 1 , the second energization circuit 6 a 2 , the third energization circuit 6 b 1 , and the fourth energization circuit 6 b 2 is shown as an example. In the figure, NA represents the pole tooth excited by coil A to N pole, SA represents the pole tooth excited by coil A to S pole, and in the same map, NB represents the pole tooth excited by coil B to N pole, and SB represents the pole tooth excited by coil B Become the pole teeth of the S pole. More precisely, the front end of the pole tooth facing the object S is excited to N pole or S pole. Whether to be excited to the N pole or to the S pole can be realized by reversing the winding directions of the coil A and the coil B (first coil 5a1, second coil 5a2, third coil 5b1, and fourth coil 5b2). In addition, the long frame E1 surrounding NA and SA and the long frame E2 surrounding NB and SB indicate the direction of the magnetic circuit w...

Embodiment 2

[0077] In addition, in Figure 4 Among them, the circumferentially adjacent first pole teeth 3a1 of the first core portion 2a-1, the circumferentially adjacent second pole teeth 3a2 of the second core portion 2a-2, and the third core portion 2b-1 may be The circumferentially adjacent third pole teeth 3b1 and the circumferentially adjacent fourth pole teeth 3b2 of the fourth core portion 2b-2 are excited to have different magnetic properties.

[0078] In this case, since the second pole tooth 3a2 and the fourth pole tooth 3b2, the first pole tooth 3a1 and the fourth pole tooth 3b1, which are located symmetrically with respect to the plane of symmetry M, are of the same magnetic pole, no crossover is formed. The magnetic circuit of the symmetry plane M of the first torque detection part 7a and the second torque detection part 7b, but a magnetic circuit is formed between the pole teeth adjacent in the circumferential direction among the first pole teeth 3a1 and the third pole tee...

Embodiment 3

[0080] In addition, if Figure 5 As shown, the first pole teeth 3a1 of the first core part 2a-1 located symmetrically with respect to the symmetry plane M of the first torque detection part 7a and the second torque detection part 7b are excited as S poles (or N poles). , the fourth pole teeth 3b2 of the fourth core portion 2b-2 are excited as N poles (or S poles). In addition, the second pole teeth 3a2 of the second core portion 2a-2 positioned symmetrically with respect to the symmetry plane M are excited as S poles (or N poles), and the third pole teeth 3b1 of the third core portion 2b-1 are excited as N pole (or S pole).

[0081] In this case, in the first pole tooth 3a1 and the third pole tooth 3b1, a magnetic path (NB→SA) (NA→SB) is formed between the pole teeth adjacent in the circumferential direction, and in addition, The distance between the second pole tooth 3a2 and the fourth pole tooth 3b2 is along the axial direction of the object to be detected ( Figure 5 Up an...

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Abstract

The invention provides a self-excitation type torque detection sensor which can increase a magnetic circuit effective for torque detection and can detect the compression stress and the tensile stress generated at the whole periphery of a detected body in a very fine manner. A first torque detection unit (7a) and a second torque detection unit (7b) are laminated such that a first energization circuit (6a1) and a third energization circuit (6b1) are disposed on a center mirror surface with a plane of symmetry (M) orthogonal to the axial direction of the object to be detected, and a second energization circuit (6a2) and a fourth energization circuit (6b2) are disposed on a center mirror surface with a plane of symmetry (M) orthogonal to the axial direction of the object to be detected. A plurality of magnetic circuits are respectively formed between the pole teeth having an inclination of plus or minus 45 degrees in the first torque detection part (7a) and the second torque detection part (7b).

Description

technical field [0001] The invention relates to a self-excitation torque detection sensor. Background technique [0002] There is a magnetostrictive torque detection device as a method of detecting torque acting on an object to be detected such as a rotating shaft without contact. For example, torque is detected by measuring the magnetostrictive effect by applying a surface treatment (for example, plating or grooving) to the surface of a shaft (shaft portion) that is a subject to detect strain to increase magnetostrictive properties. The magnetostrictive effect is measured by arranging a coil wound coaxially with the shaft and reading a change in the magnetic permeability of the shaft due to the Villari effect based on the magnitude of impedance. [0003] As a torque detection device, the applicant proposes a magnetostrictive torque detection sensor, which increases the torque detection sensitivity by increasing the magnetic circuits formed between the object to be detected...

Claims

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Application Information

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IPC IPC(8): G01L3/10
CPCG01L3/102G01L3/103H10N35/101
Inventor 古川顕秀
Owner SHINANO KENSHI
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