A high-precision synchronous detection device and method for multiple rotary transformers

Abstract

The application discloses a kind of multiple resolver synchronous high-precision detection device, adopts star type gear train to realize a motor input speed, rotation angle phase signal, generates multiple speed, rotation angle signal output resolver precision detection;Adopt the special structure of sliding adjustable type split unit to realize the clearance between star type gear train and sun gear, maximum limit gear transmission error is reduced;Using coaxial connection standard resolver to calibrate the resolver to be measured, removes the influence of gear transmission error and clearance in star type gear train;Thus, the purpose of high-precision detection is achieved.The device has the advantages of high detection precision, compact structure, easy adjustment, etc., and has broad market prospects.

Description

Technical Field

[0001] This invention belongs to the field of precision testing instrument science and technology, and particularly relates to a high-precision testing device for multiple rotary transformers simultaneously, as well as a method for high-precision testing of multiple rotary transformers simultaneously. Background Technology

[0002] Rotary transformers, also known as synchrotrons, can completely replace photoelectric encoders and are widely used in servo control systems, robotic systems, machine tools, automobiles, power, metallurgy, textiles, printing, aerospace, shipbuilding, weaponry, electronics, mining, oil fields, water conservancy, chemical industry, light industry, construction and other fields.

[0003] A rotary transformer is an electromagnetic sensor, a small AC motor used to measure angles. It works on the principle of electromagnetic induction. As the rotor and stator of the rotary transformer are in different angular positions, the output signal can realize phase transformation and amplitude modulation of the input sinusoidal carrier signal. Finally, a dedicated signal processing circuit or some DSP and microcontroller with certain functional interfaces can analyze the angular position relationship between the rotor and stator based on the relationship between the amplitude and phase of the output signal and the sinusoidal carrier signal.

[0004] A rotary transformer consists of a stator and a rotor. The stator winding serves as the primary side of the transformer, receiving the excitation voltage, while the rotor winding serves as the secondary side, obtaining the induced voltage through electromagnetic coupling.

[0005] In the production of rotary transformers, after assembly, testing and calibration are essential. Currently, rotary transformer manufacturers calibrate rotary transformers using a servo motor-driven precision angle encoder to calibrate a single, coaxially connected rotary transformer under test. This method has the following drawbacks: firstly, the precision angle encoder requires high accuracy and is costly; secondly, transmission errors within the angle encoder can also affect the calibration accuracy of the rotary transformer under test; and thirdly, this results in a very low number of rotary transformers that a single precision angle encoder can test per day, leading to extremely low testing efficiency.

[0006] To improve the efficiency of pre-shipment calibration and testing of rotary transformers while ensuring testing accuracy, a high-precision synchronous testing device for multiple rotary transformers using a star-shaped gear train is proposed, capable of simultaneously testing multiple rotary transformers. Summary of the Invention

[0007] The purpose of this invention is to provide a high-precision detection device for multiple rotary transformers that can simultaneously detect multiple rotary transformers.

[0008] Another objective of this invention is to provide a method for synchronous high-precision detection of multiple rotary transformers.

[0009] The technical solution adopted in this invention is as follows: a high-precision detection device for multiple rotary transformers synchronously, comprising a motor 1, an input shaft 15, four distribution units 4, a support 5, a housing 6, and a sun gear 14; the four distribution units 4 have the same structure and are arranged in a star shape outside the sun gear 14; the planetary gears 34 and the sun gear 14 in the distribution units 4 are both cylindrical gears, and the planetary gears 34 and the sun gear 14 are externally meshed; the motor 1 is connected to one end of the input shaft 15 through a coupling, and the other end of the input shaft 15 is connected to a standard rotary transformer 21 through a coupling; the input shaft 15 is supported at the center of the housing 6; the input shaft 15 and the sun gear 14 are fixedly connected.

[0010] The transfer unit 4 consists of an output shaft 32, planetary gears 34, a sliding frame 41, and a spring 42. The planetary gears 34 are fixedly connected to the output shaft 32. The sliding frame 41 has a fork-shaped structure. The planetary gears 34 and the output shaft 32 are installed at the front end of the fork-shaped structure and are partially enclosed in the fork-shaped structure. The protruding guide block 45 at the rear end of the fork-shaped structure is embedded in the concave groove on the housing 6 and slides radially along the sun gear 14 in the concave groove. The spring 42 is arranged on the guide post at the rear end of the fork-shaped structure, and the other end is encapsulated in the housing 6 by the square end cap 2.

[0011] Another technical solution adopted by the present invention is: a method for synchronous high-precision detection of multiple rotary transformers, using a device for synchronous high-precision detection of multiple rotary transformers. The specific operation process is as follows: one end of the input shaft 15 is connected to a motor 1, and the other end is connected to a standard rotary transformer 21; multiple drive units 4 are radially distributed along the sun gear 14; each drive unit 4 consists of a planetary gear 34 and an output shaft 32; one end of the output shaft 32 is connected to a standard rotary transformer 31, and the other end is connected to a rotary transformer 43 to be tested; when the motor 1 drives the input shaft 15 to rotate, the reference is detected by the standard rotary transformer 21. Signal 1: The rotation angle signal of the input shaft 15, after being transmitted through the sun gear 14 and planet gear 34, drives the output shaft 32 to rotate. The output shaft 32 drives the standard rotary transformer 2 31 and the rotary transformer under test 43 to rotate at the same speed and in the same phase. Reference signal 2 and measured signal 3 are obtained on the standard rotary transformer 2 31. At this time, by comparing the difference between reference signal 2 and reference signal 1, this difference is used to determine the speed difference and rotation angle phase difference between the output shaft 32 and the input shaft 15. By using the difference between reference signal 2 and reference signal 1 to correct measured signal 3, the accurate speed and rotation angle phase signals of the rotary transformer under test 43 can be obtained.

[0012] The beneficial effects of this invention are as follows: A high-precision synchronous testing device for multiple rotary transformers utilizes a star-shaped gear train to achieve precise testing of rotary transformers by generating multiple speed and angle signal outputs from a single input motor speed and angle phase signal; the special structure of the sliding adjustable transfer unit eliminates backlash between the star-shaped gear train and the sun gear, minimizing gear transmission errors; and the coaxial connection of a standard rotary transformer is used to calibrate the rotary transformer under test, completely eliminating the influence of gear transmission errors and backlash in the star-shaped gear train; thus achieving high-precision testing. This device has advantages such as high testing accuracy, compact structure, and convenient adjustment, and has broad market prospects. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the appearance of a high-precision synchronous detection device for multiple rotary transformers.

[0014] Figure 2 for Figure 1 AA section view;

[0015] Figure 3 for Figure 1 The C-direction view;

[0016] Figure 4 This is a structural diagram of a shunt unit in a high-precision synchronous detection device for multiple rotary transformers;

[0017] Figure 5 This is a schematic diagram of the working principle of a high-precision synchronous detection device for multiple rotary transformers. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings.

[0019] like Figure 1 , Figure 2 and Figure 3 A high-precision synchronous detection device for multiple rotary transformers includes a motor 1, an input shaft 15, four distribution units 4, a support 5, a housing 6, and a sun gear 14. The four distribution units 4 have identical structures and are arranged in a star shape outside the sun gear 14. The planetary gears 34 and the sun gear 14 in the distribution units 4 are both cylindrical gears, and the planetary gears 34 mesh externally with the sun gear 14. The motor 1 is connected to one end of the input shaft 15 via a coupling, and the other end of the input shaft 15 is connected to a standard rotary transformer 21 via a coupling. The input shaft 15 is supported at the center of the housing 6. The input shaft 15 and the sun gear 14 are fixedly connected. The motor 1 drives the input shaft 15 and the sun gear 14 to rotate via the coupling. The sun gear 14 drives the four planetary gears 34 meshing with it to rotate. The four planetary gears 34 drive the four output shafts 32 to rotate. The four output shafts 32 drive the rotary transformers connected to their ends to rotate.

[0020] Reference Figure 2 and Figure 4 The transfer unit 4 consists of an output shaft 32, planetary gears 34, a sliding frame 41, and a spring 42. The planetary gears 34 are fixedly connected to the output shaft 32. The sliding frame 41 has a fork-shaped structure. The planetary gears 34 and the output shaft 32 are installed at the front end of the fork-shaped structure and are partially enclosed in the fork-shaped structure. The protruding guide block 45 at the rear end of the fork-shaped structure is embedded in the concave groove on the housing 6 and slides radially along the sun gear 14 in the concave groove. The spring 42 is arranged on the guide post at the rear end of the fork-shaped structure, and the other end is encapsulated in the housing 6 by the square end cap 2.

[0021] like Figure 5 One end of the input shaft 15 is connected to a motor 1, and the other end is connected to a standard rotary transformer 21. Multiple drive units 4 are distributed radially along the sun gear 14. Each drive unit 4 consists of a planetary gear 34 and an output shaft 32. One end of the output shaft 32 is connected to the standard rotary transformer 31, and the other end is connected to a rotary transformer under test 43. When the motor 1 drives the input shaft 15 to rotate, the standard rotary transformer 21 detects a reference signal. The rotation angle signal of the input shaft 15 is then transmitted through the sun gear 14 and the planetary gears 34. The output shaft 32 rotates, causing the standard rotary transformer 31 and the rotary transformer under test 43 to rotate at the same speed and in the same phase. Reference signal 2 and measured signal 3 are obtained from the standard rotary transformer 31. By comparing the difference between reference signal 2 and reference signal 1, this difference is used to determine the speed difference and rotational phase difference between the output shaft 32 and the input shaft 15. The measured signal 3 is then corrected using the difference between reference signal 2 and reference signal 1, thus obtaining the accurate speed and rotational phase signals of the rotary transformer under test 43. This describes the precise detection of one rotary transformer under test 43 by a single distribution unit 4. Each additional distribution unit 4 can accommodate one more rotary transformer under test. Under structurally permissible conditions, the more distribution units 4 there are, the more working positions of the rotary transformer under test 43, resulting in higher detection efficiency.

[0022] The transfer unit 4 includes a planetary gear 34, an output shaft 32, a sliding frame 41, a spring 42, a protruding guide block 45, a square end cover 2, and a bearing cover 3. The two ends of the output shaft 32 are connected to a standard rotary transformer 31 and a rotary transformer under test 43 via couplings. The planetary gear 34 is fixedly connected to the output shaft 32. The output shaft 32 is connected to the sliding frame 41 via bearings. As the sliding frame 41 slides radially along the sun gear 14, the output shaft 32 completely penetrates the housing 6. The planetary gear 34 is fixedly connected in the middle of the output shaft 32, and bearing covers 3 are installed on both sides of the output shaft 32. The bearing covers 3 are fixedly connected to the sliding frame 41 by screws. The sliding frame 41 spans both sides of the planetary gear 34. The rear end of the fork-shaped structure of the sliding frame 41 has a protruding guide block 45 and slides radially along the sun gear 14. The spring 42 is pre-compressed between the fork-shaped structure of the sliding frame 41 and the square end cover 2.

[0023] Reference Figure 1 , Figure 2 and Figure 3 The support 5 is fixedly connected to the bottom of the housing 6. The outer ring of the housing 6 has an opening at each transfer unit 4. The square end cover 2 is sealed to the reserved opening of the housing 6 around its perimeter. The middle of the inner side of the square end cover 2 is in contact with the spring 42.

[0024] Work process:

[0025] When motor 1 drives input shaft 15 to rotate, reference signal 1 is detected by standard rotary transformer 21. The rotation angle signal of input shaft 15, after being transmitted through sun gear 14 and planet gear 34, drives output shaft 32 to rotate. Output shaft 32 drives standard rotary transformer 31 and the rotary transformer under test 43 to rotate at the same speed and in the same phase. Reference signal 2 and measured signal 3 are obtained on standard rotary transformer 31. At this time, by comparing the difference between reference signal 2 and reference signal 1, this difference is used to determine the speed difference and rotation angle phase difference between output shaft 32 and input shaft 15. By using the difference between reference signal 2 and reference signal 1 to correct measured signal 3, the accurate speed and rotation angle phase signals of the rotary transformer under test 43 can be obtained. The above describes the accurate detection of one rotary transformer under test 43 by a single transfer unit 4. Each additional transfer unit 4 can add one more rotary transformer under test 43. Under the condition that the structure allows, the more transfer units 4 there are, the more working positions of the rotary transformer under test 43, and the higher the detection efficiency.

[0026] Working principle:

[0027] A star gear train is used to realize a precision transmission with one input and multiple outputs. The input shaft is connected to the sun gear of the star gear train, and multiple output shafts are connected to planet gears respectively. Multiple planet gears are evenly distributed along the radial direction of the sun gear and mesh with the sun gear. Each planet gear and the sun gear can move relative to each other and the meshing gap can be adjusted. That is, the meshing gap between the planet gear and the sun gear is adjustable. Both ends of each output shaft can be connected to a rotary transformer.

Claims

1. A high-precision synchronous detection device for multiple rotary transformers, characterized in that: It includes an electric motor (1), an input shaft (15), four transfer units (4), a support (5), a housing (6), a sun gear (14), and a standard rotary transformer (21). The electric motor (1) is connected to one end of the input shaft (15) via a coupling. The input shaft (15) and the sun gear (14) are fixedly connected. The other end of the input shaft (15) is connected to the standard rotary transformer (21) via a coupling. The input shaft (15) is supported at the center of the housing (6). The support (5) is fixedly connected to the bottom of the housing (6). The four transfer units (4) have the same structure and consist of an output shaft (32), planetary gears (34), a sliding frame (41), a spring (42), an outwardly protruding guide block (45), a square end cap (2), and a bearing cover (3). They are arranged in a star shape outside the sun gear (14). The output shaft (32) One end is connected to a standard rotary transformer II (31), and the other end is connected to a rotary transformer under test (43). The planetary gear (34) and the sun gear (14) are both cylindrical gears, and the planetary gear (34) meshes with the sun gear (14). The output shaft (32) is equipped with bearing covers (3) on both sides. The bearing covers (3) are fixedly connected to the sliding frame (41) by screws. The planetary gear (34) is fixedly connected to the output shaft (32). The sliding frame (41) has a fork-shaped structure. The planetary gear (34) and the output shaft (32) are installed at the front end of the fork-shaped structure and are partially surrounded in the fork-shaped structure. The convex guide block (45) at the rear end of the fork-shaped structure is embedded in the concave groove on the housing (6) and slides radially along the sun gear (14) in the concave groove. The spring (42) is arranged on the guide post at the rear end of the fork-shaped structure, and the other end is encapsulated in the housing (6) by the square end cap (2).

2. A method for synchronous high-precision detection of multiple rotary transformers, employing the synchronous high-precision detection device for multiple rotary transformers as described in claim 1, characterized in that: One end of the input shaft (15) is connected to a motor (1), and the other end is connected to a standard rotary transformer (21); multiple drive units (4) are distributed radially along the sun gear (14); each drive unit (4) consists of a planetary gear (34) and an output shaft (32); the output shaft (32) passes through the housing (6), the standard rotary transformer (31) and the rotary transformer under test (43) are located on both sides of the housing (6) and are horizontally symmetrically distributed, the standard rotary transformer (31) and the standard rotary transformer (21) are located on the same side of the housing (6); when the motor (1) drives the input shaft (15) to rotate, the reference signal (1) is detected by the standard rotary transformer (21). After the rotation angle signal of the input shaft (15) is transmitted through the sun gear (14) and planet gear (34), it drives the output shaft (32) to rotate. The output shaft (32) drives the standard rotary transformer II (31) and the rotary transformer under test (43) to rotate at the same speed and in the same phase. Reference signal II and measured signal III are obtained on the standard rotary transformer II (31). At this time, by comparing the difference between reference signal II and reference signal I, this difference is used to determine the speed difference and rotation angle phase difference between the output shaft (32) and the input shaft (15). The measured signal III is corrected by using the difference between reference signal II and reference signal I, and the accurate speed and rotation angle phase signals of the rotary transformer under test (43) can be obtained.

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