A zero position calibration device for a steering engine

Abstract

The application provides a rudder zero calibration device and a rudder, which comprise a potentiometer assembly and a first fastener, the potentiometer assembly is located at the shaft end of a rudder output shaft and can be fixed with the rudder output shaft through the first fastener; a second fastener is located on a rudder shell and can fix the rudder shell and the potentiometer assembly, so that when the first fastener is loosened to separate the potentiometer assembly and the rudder output shaft, the potentiometer assembly is fixed, and the rudder output shaft can rotate relative to the potentiometer assembly. After the rudder is assembled, electronic zero calibration is performed through the potentiometer assembly, the power is cut off after calibration, the first fastener is loosened, the rudder output shaft and the potentiometer assembly are separated, the position of the potentiometer assembly is fixed at the electronic zero by the second fastener, and mechanical zero adjustment is performed on the rudder output shaft, so that double zero adjustment of mechanical and electronic zeros is performed, respectively, the resistance deviation of the potentiometer caused by assembly errors and accumulated tolerances can be avoided, and self-alignment is realized.

Description

Technical Field

[0001] This application relates to the field of servo motor calibration technology, and more specifically, to a servo motor zero-position calibration device. Background Technology

[0002] With the rapid development of the aviation industry, electric servo motors are the core components for controlling the flight direction of aircraft. Miniaturization, lightweight design, and high torque output are key trends in servo motor technology development. The control precision of the servo motor is a crucial factor determining the accuracy of flight control. An electric servo motor is essentially a position servo system; servo control, or follow-up control, receives commands from the controller during flight to control the control blades, ultimately adjusting the aircraft's attitude. All these commands are executed based on the servo motor's zero position; therefore, the deviation and consistency of the zero position are critical, especially for mass-produced servos, where consistency significantly impacts batch production.

[0003] The current structure connects the servo motor output shaft to a potentiometer shaft, which is then connected to a position sensor. This allows the output shaft and potentiometer shaft to rotate synchronously. The potentiometer (position sensor) position signal is fed back to the servo controller, enabling closed-loop position control. The assembly method involves first adjusting the mechanical zero position, then the electronic zero position, with the potentiometer installed last. Accuracy relies entirely on feel and a ohmmeter. The three wires are checked in pairs to ensure a resistance difference of ≤4Ω across the entire range (approximately 3000Ω). The difficulty lies in adjusting the electronic zero position of the potentiometer. This requires partially tightening the potentiometer screw, then prying it little by little with a small screwdriver, measuring the resistance after each pry. Once the resistance meets the requirement, the screw is tightened again, only to change the resistance. This process is extremely inefficient, time-consuming, and repetitive. During handling and testing, if the potentiometer resistance does not meet the requirements during final factory inspection, the device must be disassembled again. Therefore, this structure is unsuitable for products requiring high zero-position accuracy. Summary of the Invention

[0004] This application provides a servo motor zero-position calibration device to solve the problems of complex operation and time-consuming and labor-intensive calibration of existing potentiometer zero-position calibration.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A servo motor zero-position calibration device, comprising:

[0007] A potentiometer assembly and a first fastener, the potentiometer assembly being located at the shaft end of the servo output shaft and being fixed to the servo output shaft by the first fastener so as to rotate coaxially with the servo output shaft;

[0008] The second fastener, located on the servo housing, secures the servo housing to the potentiometer assembly. When the first fastener loosens the potentiometer assembly and the servo output shaft, the potentiometer assembly is secured, allowing the servo output shaft to rotate relative to the potentiometer assembly.

[0009] Optionally, the potentiometer assembly includes:

[0010] A potentiometer is fixed to the rear support of the servo motor, and the potentiometer has a central hole;

[0011] A potentiometer shaft is fixed in the center hole, and the potentiometer shaft is connected to the servo motor output shaft via a bearing. The potentiometer shaft and the servo motor output shaft are coaxially arranged, and the first fastener is used to fix the potentiometer shaft and the servo motor output shaft.

[0012] Optionally, the potentiometer shaft includes:

[0013] The shaft body and the radial limiting part are located on the shaft body and extend radially. The radial limiting part is provided with mounting holes for installing the first fastener.

[0014] Optionally, the mounting hole is a semi-circular waist-shaped hole, and two semi-circular waist-shaped holes are symmetrically arranged on the radial limiting part along the axis of the potentiometer.

[0015] Optionally, the potentiometer is fixed to the rear support of the servo motor via potentiometer fastening screws; the number of potentiometer fastening screws is at least two.

[0016] Optionally, each of the semi-circular waist-shaped holes is provided with the first fastener.

[0017] Optionally, the first fastener is a screw.

[0018] Optionally, a control component is included, which is connected to the potentiometer assembly and is used to control the rotation of the servo output shaft based on the zero-position deviation detected by the potentiometer assembly.

[0019] This application provides a servo zero-position calibration device, comprising: a potentiometer assembly and a first fastener. The potentiometer assembly is located at the shaft end of the servo output shaft and can be fixed to the servo output shaft by the first fastener so as to rotate coaxially with the servo output shaft; a second fastener is located on the servo housing and can fix the servo housing to the potentiometer assembly so that when the first fastener loosens the potentiometer assembly and the servo output shaft, the potentiometer assembly is fixed, allowing the servo output shaft to rotate relative to the potentiometer assembly.

[0020] The servo zero-position calibration device and servo provided in this application embodiment have the following technical advantages compared to the prior art:

[0021] A potentiometer assembly is installed at the end of the servo output shaft. A first fastener allows for coaxial positioning and force transmission / non-transmission with the servo output shaft. The potentiometer assembly and the servo output shaft are separated or fixed using the first fastener. After servo assembly, electronic zero-position calibration is performed using the potentiometer assembly. After calibration, power is cut off, and the first fastener is loosened, separating the servo output shaft and the potentiometer assembly. A second fastener then fixes the potentiometer assembly at the electronic zero position, while the servo output shaft undergoes mechanical zero-position adjustment. This allows for high-precision dual zero-position adjustment of both mechanical and electronic zero positions, enabling highly consistent servo combinations for multiple servos used in the same aircraft, thus improving aircraft reliability and control precision. It allows for mass production on assembly lines, with each process completed in one step, eliminating repeated adjustments in intermediate stages, resulting in good manufacturability and strong operability. It avoids potentiometer resistance deviations caused by assembly errors and cumulative tolerances, achieving self-calibration. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0023] Figure 1 A lateral structural schematic diagram of a servo motor zero-position calibration device provided in an embodiment of this application;

[0024] Figure 2 This is an exploded structural diagram of a servo motor zero-position calibration device provided in an embodiment of this application.

[0025] The following labels are shown in the attached diagram:

[0026] Servo output shaft 1, servo output shaft bearing 2, servo swing arm 3, bearing 4, potentiometer shaft 5, first fastener 6, second fastener 7, rear support 8, potentiometer 9, potentiometer fastening screw 10. Detailed Implementation

[0027] This invention discloses a servo motor zero-position calibration device to solve the problems of complex operation and time-consuming and labor-intensive calibration of existing potentiometer zero-position calibration.

[0028] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0029] Please see Figure 1-2 , Figure 1 A lateral structural schematic diagram of a servo motor zero-position calibration device provided in an embodiment of this application; Figure 2 This is an exploded structural diagram of a servo motor zero-position calibration device provided in an embodiment of this application.

[0030] In one specific embodiment, the servo zero-position calibration device provided in this application includes a potentiometer assembly, a first fastener 6, and a second fastener 7. The potentiometer assembly is located at the end of the servo output shaft 1, preferably at the tail end of the servo output shaft 1. The potentiometer assembly is synchronously connected to the servo output shaft 1 and specifically includes a potentiometer shaft 5 and a potentiometer 9. The potentiometer 9 feeds back the position signal to the control component to achieve closed-loop position control. The potentiometer assembly is fixed to the end of the servo output shaft 1 by the first fastener 6, which is preferably a screw. The first fastener 6 is axially arranged. When the first fastener 6 is tightened, the potentiometer assembly is fixed to the servo output shaft 1 and rotates synchronously under the drive of the servo output shaft 1. When the first fastener 6 is loosened, the potentiometer assembly is disconnected from the servo output shaft 1. When the servo output shaft 1 rotates, the potentiometer assembly does not rotate in conjunction with the servo output shaft 1. The second fastener 7 is fixed to the servo housing, which can fix the servo housing to the potentiometer assembly. When the first fastener 6 loosens the potentiometer assembly and the servo output shaft 1, it fixes the potentiometer assembly and the servo housing to keep them relatively stationary, thereby allowing the servo output shaft 1 to rotate relative to the potentiometer assembly for mechanical zero-position adjustment.

[0031] The actual usage process is as follows: The potentiometer assembly and the servo output shaft 1 are fixed by the first fastener 6. When the first fastener 6 is tightened, the servo output shaft 1 can achieve coaxial position and force transmission with the potentiometer assembly. When the servo swing arm 3 rotates, the rotation angle and rotation torque of the potentiometer assembly and the servo output shaft 1 are consistent. When the first fastener 6 is loosened, the servo output shaft 1 is separated from the potentiometer shaft 5 and no longer transmits position and force coaxially. The rotation angles of the two are no longer consistent and can rotate independently without interference. Thus, the electronic zeroing of the potentiometer 9 and the mechanical zeroing of the servo output shaft 1 can be realized, achieving high-precision setting of dual zero position with mechanical zero position and electronic zero position.

[0032] The potentiometer assembly includes a potentiometer 9 and a potentiometer shaft 5. The potentiometer 9 is fixed to the rear support 8 of the servo motor. The specific shape and position of the potentiometer 9 can be set according to existing technology and will not be elaborated here. The potentiometer shaft 5 is fixed in a central hole and fastened with potentiometer fastening screws 10 to maintain a consistent rotation angle. The potentiometer 9 is fixed to the rear support 8 of the servo motor via potentiometer fastening screws 10. There are at least two potentiometer fastening screws 10. The potentiometer shaft 5 is connected to the servo motor output shaft 1 via a bearing 4. A first fastener 6 fixes the potentiometer shaft 5 and the servo motor output shaft 1. The potentiometer shaft 5 enables the installation and fixation of the potentiometer 9 and the servo motor output shaft 1. In one embodiment, the potentiometer shaft 5 includes a shaft body and a radial limiting part. The radial limiting part is located on the shaft body and extends radially. The radial limiting part has a mounting hole for installing the first fastener 6, which axially penetrates the radial limiting part to achieve the installation of the first fastener 6. Specifically, the mounting holes are semi-circular oblong holes, and two semi-circular oblong holes are symmetrically arranged along the axis of the potentiometer shaft 5 on the radial limiting part; thereby improving the connection strength. The first fastener 6 is respectively provided in each of the semi-circular oblong holes.

[0033] In this embodiment, the servo zero-position calibration device further includes a control component connected to the potentiometer 9. The control component is used to control the servo output shaft 1 to rotate according to the zero-position deviation detected by the potentiometer 9 until the left and right deviations of the position sensor are 0 and the motor stops rotating. At this time, the electronic zero position has been returned to zero.

[0034] In one specific embodiment, the servo output shaft 1 and two servo output shaft bearings 2 are fixed to the servo housing. A bearing 4 and a potentiometer shaft 5 are installed at the tail of the servo output shaft 1. The potentiometer shaft 5 has two symmetrical semi-circular waist-shaped holes, which can be used to fasten the potentiometer 9 and the servo output shaft 1 with release screws. The potentiometer 9 is fixed to the rear support 8 with potentiometer fastening screws 10, and then assembled as a component. At the same time, the potentiometer shaft 5 is passed through the center hole of the potentiometer, and the two are fastened together with potentiometer tensioning screws to keep the rotation angle consistent. The position of the servo output shaft 1 is adjusted so that it is near the mechanical zero position, and the position of the potentiometer shaft 5 is adjusted so that it is near the zero position. The two first fasteners 6 are tightened. After tightening, the servo output shaft 1 and the potentiometer shaft 5 achieve coaxial position and force transmission. At this time, the rotation angle and rotation torque of the two are always consistent. After all other assembly work is completed, the zeroing stage is entered, including the adjustment of the mechanical zero position and the electronic zero position. The servo motor is connected to the controller, and then connected to the control power and motor power power. The controller detects the zero-position deviation of potentiometer 9 (position sensor) and controls the motor to rotate until the left and right deviations of the position sensor are zero, at which point the motor stops rotating, and the electronic zero position is zeroed. The power and control power are then disconnected, and the position of potentiometer shaft 5 is fixed externally to the servo motor using the second fastener 7. The electronic zero position is now locked. The two release screws are then loosened, causing the servo motor output shaft 1 and potentiometer shaft 5 to "separate," no longer transmitting position and force coaxially. Their rotation angles are no longer consistent, and they can rotate independently without interference. The reduction gear and servo motor output shaft 1 are adjusted to the mechanical zero position (this step can be done using a tool to adjust the zero position), and the mechanical zero position is now zeroed. The two first fasteners 6 are tightened again, and the servo motor output shaft 1 and potentiometer shaft 5 are once again coaxially transmitting position and force, and their rotation angles and torques are once again consistent. Finally, the set screw is loosened, completing the zeroing process. The mechanical and electronic zero positions are now set with high precision.

[0035] The aforementioned device achieves rapid and accurate electronic zero-position calibration through a closed-loop control mechanism where the servo motor's electronic zero position is powered on and the potentiometer sensor self-calibrates. The output shaft and its tail potentiometer shaft 5 are separated via a detachable device, allowing for both coaxial positioning and force transmission / non-transmission. In other words, the two shafts can be separated or joined. After servo motor assembly and electronic zero-position calibration, power is cut off, the two shafts are separated, and the potentiometer 9 is fixed in position (now at electronic zero position). The output shaft is then adjusted to mechanical zero position, achieving a high-precision "dual zero position" (mechanical and electronic zero positions). This is suitable for products requiring high-precision zero positions. It allows for highly consistent servo motor combinations for multiple servos in the same aircraft, ensuring aircraft reliability and control precision. It enables mass production on assembly lines, with each process completed in one step, eliminating repeated adjustments in intermediate stages, resulting in good manufacturability and strong operability. It avoids potentiometer resistance deviations caused by assembly errors and cumulative tolerances, achieving self-calibration.

[0036] Based on the servo zero-position calibration device provided in the above embodiments, this application also provides a servo, which includes any one of the servo zero-position calibration devices in the above embodiments. Since the servo uses the servo zero-position calibration device in the above embodiments, the beneficial effects of the servo are explained in the above embodiments.

[0037] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0038] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A device for zero calibration of a steering engine, characterized in that The application relates to a rudder zero position calibration device, which comprises the following parts: a potentiometer assembly and a first fastener, the potentiometer assembly is located at the shaft end of a rudder output shaft and can be fixed with the rudder output shaft through the first fastener to rotate coaxially with the rudder output shaft; a second fastener is located on the rudder shell and can fix the rudder shell with the potentiometer assembly to fix the potentiometer assembly when the first fastener is loosened from the potentiometer assembly and the rudder output shaft, so that the rudder output shaft can rotate relative to the potentiometer assembly.

2. The device of claim 1, wherein, The potentiometer assembly comprises: a potentiometer fixed with the rear support base of the rudder, the potentiometer has a central hole; a potentiometer shaft fixed in the central hole and connected with the rudder output shaft through a bearing, the potentiometer shaft and the rudder output shaft are coaxially arranged, and the first fastener is used for fixing the potentiometer shaft and the rudder output shaft.

3. The device of claim 2, wherein, The potentiometer shaft comprises: a shaft body and a radial limiting part located on the shaft body and extending in the radial direction, and the radial limiting part is provided with mounting holes for mounting the first fastener.

4. The device of claim 3, wherein, The mounting holes are semicircular waist type holes, and two semicircular waist type holes are symmetrically arranged on the radial limiting part along the shaft center of the potentiometer shaft.

5. The device of claim 1, wherein, The potentiometer is fixed with the rear support base of the rudder through potentiometer fastening screws, and the number of the potentiometer fastening screws is at least two.

6. The device of claim 4, wherein, Each semicircular waist type hole is respectively provided with the first fastener.

7. The zero calibration device for a steering engine according to claim 6, wherein The first fastener is a screw.

8. The zero calibration apparatus for steering motor according to claim 6, wherein The application further comprises a control assembly connected with the potentiometer assembly and used for controlling the rotation of the rudder output shaft according to the zero position deviation detected by the potentiometer assembly.

9. A steering gear, characterized in that The application relates to a rudder zero position calibration device, which comprises the following parts: a rudder shell; a rudder swing force arm located on the rudder shell; a rudder output shaft, the two ends of the rudder output shaft in the axial direction are respectively provided with bearings, the rudder output shaft is connected with the rudder shell through the bearings; the rudder swing force arm is fixedly connected with the rudder output shaft to rotate around the axis line thereof; and the potentiometer assembly of the rudder zero position calibration device is fixed with the rudder output shaft.

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