Automotive actuator motor with encoder

Abstract

This application discloses an automotive actuator motor with an encoder, comprising: a motor body; an encoder fixedly connected to a shaft at the tail end of the motor body; a filter board between the encoder and the motor body; two terminals on the tail end cover of the motor body connected to the filter board; and a controller that is communicatively connected to both the filter board and the encoder. Using this method, precise position / speed feedback is provided through an external encoder, achieving accurate positioning and rapid response, overcoming the inherent defects of open-loop control. Compared to using high-precision sensors, this method is less expensive. Furthermore, by placing a filter board at the source, interference is effectively suppressed, protecting the sensitive encoder signal and ensuring stable and reliable feedback. The combination of a Hall sensor and the encoder avoids single-point failures, making operation safer. The external encoder offers flexible installation, and the filter board integrated on the terminal side saves space. The overall structure is compact and easy to install inside the vehicle.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to an automotive actuator motor with an encoder. Background Technology

[0002] During operation, the open-loop control of automotive actuator motors relies on preset parameters and cannot detect load changes in real time. This results in the motor operating outside the specified load range and failing to execute control accurately. Furthermore, the motor response delay after relevant execution commands are issued significantly impacts the safety of the vehicle during operation.

[0003] Current common solutions involve improving sensor accuracy. High-precision sensors provide real-time feedback on the motor's position, speed, and torque, forming a closed-loop control to reduce the cumulative error of open-loop control. However, the EMI (electromagnetic interference) of the motor itself, as an automotive actuator, cannot be ignored. Using high-precision sensors also places high demands on motor EMI. Therefore, the adoption of high-precision sensors and the need to improve motor EMI undoubtedly increase automotive production costs. Furthermore, the vulnerability of high-precision products to damage cannot be overlooked. Consequently, this approach has become an area requiring optimization as the automotive industry has evolved.

[0004] Therefore, there is an urgent need to design an automotive actuator motor with an encoder to solve one or more technical problems that are lacking in the existing technology. Summary of the Invention

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: an automotive actuator motor with an encoder, characterized in that it includes: a motor body, an encoder is fixedly connected to the shaft at the tail end of the motor body, a filter plate is provided between the encoder and the motor body, two terminals are provided on the end cover at the tail end of the motor body, the terminals are connected to the filter plate, and a controller is communicatively connected to the filter plate and the encoder respectively.

[0006] In a preferred embodiment, the filter board is further provided with a sensor group, which includes two Hall sensors and the two Hall sensors are communicatively connected to the controller.

[0007] In a preferred embodiment, the encoder is a magnetoelectric encoder, and the magnetic ring or code disk of the encoder is fixedly connected to the rotating shaft of the motor body.

[0008] In a preferred embodiment, the controller includes a fault diagnosis circuit for switching between the encoder and the sensor group.

[0009] The beneficial effects of this utility model are: it provides precise position / speed feedback through an external encoder, achieving accurate positioning and rapid response, overcoming the inherent defects of open-loop control, and is less expensive than using high-precision sensors. At the same time, by setting a filter board at the source, interference is effectively suppressed, sensitive encoder signals are protected, and the feedback signal is ensured to be stable and reliable. Furthermore, the combination of Hall sensor and encoder avoids single-point failure, making operation safer. The external encoder is flexible to install, the filter board is integrated on the terminal side to save space, the overall structure is compact, and it is easy to arrange in the vehicle. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] In the picture:

[0012] 10. Motor body; 11. Terminals; 12. Encoder; 13. Filter board. Detailed Implementation

[0013] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0014] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "connection" can be a direct connection or an indirect connection through an intermediate medium. "Fixed" means that the relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of this utility model, such as "inner," "outer," "top," and "bottom," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0015] In this embodiment of the invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0016] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0017] References to "one embodiment" or "some embodiments" as used in this specification mean that one or more embodiments of the present invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0018] like Figure 1 As shown, this utility model provides an automotive actuator motor with an encoder 12, comprising: a motor body 10, an encoder 12 fixedly connected to the shaft at the tail end of the motor body 10, a filter plate 13 provided between the encoder 12 and the motor body 10, two terminals 11 provided on the end cap at the tail end of the motor body 10, the terminals 11 being connected to the filter plate 13, and a controller, the controller being communicatively connected to the filter plate 13 and the encoder 12 respectively;

[0019] Specifically, an encoder 12 is concentrically fixedly connected to the shaft at the tail end of the motor body 10. The encoder 12 can be a magnetoelectric encoder or a photoelectric encoder. In this embodiment, a magnetoelectric encoder 12 is preferred because it is relatively insensitive to axial clearance and contamination and is more suitable for the automotive environment. The magnetic ring or code disk of the encoder 12 is fixedly connected to the shaft of the motor body 10 and rotates synchronously with the rotor. The reading head of the encoder 12 is aligned with the magnetic ring or code disk to detect the precise angular position and rotation speed of the motor rotor in real time and at high resolution.

[0020] To prevent electromagnetic waves generated by the motor body 10 during operation from leaking through the wiring and interfering with other electrical appliances, a filter board 13 is fixedly installed at the tail end of the motor body 10. This filter board 13 integrates a composite filter circuit consisting of common-mode inductors, differential-mode inductors, X / Y capacitors (safety capacitors), and TVS transient suppression diodes, such as π-type or T-type filters. The power input terminals 11 (+ / -) and / or control signal terminals 11 of the motor body 10 are directly soldered onto this filter board 13. This method directly filters out high-frequency conducted interference generated during motor operation at the source, preventing it from leaking through power lines or signal lines and contaminating external circuits. It also suppresses external interference from entering the motor drive circuit. The filter board 13 can also be fitted with a metal shield to form a local shielding cavity. The filter board 13 and the encoder 12 are also connected to a controller (not shown in the figure) via wiring harnesses.

[0021] Furthermore, the filter board 13 is also provided with a sensor group (not shown in the figure), which includes two Hall sensors, and the two Hall sensors are communicatively connected to the controller;

[0022] Specifically, in this embodiment, to avoid affecting normal operation when the encoder 12 malfunctions, a sensor group is also provided in the filter board 13. This sensor group consists of two Hall sensors, which are equidistantly arranged along the circumference to detect the rotor magnetic pole position. The controller can use the frequency of the Hall signal change to estimate the speed and rough position of the motor body 10. The Hall sensors and their leads are independent of the encoder 12, and their signals are connected to the controller through another set of wires / connectors, forming redundancy in the physical channel. Furthermore, the controller is designed with a fault diagnosis circuit (not shown in the figure). This fault diagnosis circuit is used to continuously monitor the validity of the encoder 12 signal, such as signal continuity and rationality. When the encoder 12 signal failure is detected, such as signal loss, out-of-range, or verification error, the controller automatically switches to closed-loop control using the speed / position estimated by the Hall sensors to ensure that basic functions and safe operation can be maintained. This avoids complete actuator malfunction and greatly improves system safety and fault tolerance.

[0023] In summary, the external encoder 12 provides precise position / velocity feedback, enabling accurate positioning and rapid response, overcoming the inherent defects of open-loop control. Compared to using high-precision sensors, it is also more cost-effective. Furthermore, by setting up a filter board 13 at the source, interference is effectively suppressed, protecting the sensitive encoder 12 signal and ensuring stable and reliable feedback signals. The combination of the Hall sensor and the encoder 12 avoids single-point failures, making operation safer. The external encoder 12 offers flexible installation, and the filter board 13 is integrated on the terminal 11 side, saving space. The overall structure is compact and easy to arrange inside the vehicle.

[0024] This invention is not limited to the description in the specification and embodiments. Therefore, other advantages and modifications can be readily realized by those skilled in the art. Thus, without departing from the spirit and scope of the general concept as defined by the claims and their equivalents, this invention is not limited to the specific details, representative devices and illustrated examples shown and described herein.

Claims

1. An automotive actuator motor with an encoder, characterized in that, include: The motor body has an encoder fixedly connected to the shaft at the tail end. A filter plate is also provided between the encoder and the motor body. Two terminals are provided on the end cover at the tail end of the motor body. The terminals are connected to the filter plate. The controller is communicatively connected to the filter plate and the encoder.

2. The automotive actuator motor with encoder according to claim 1, characterized in that, The filter board is also equipped with a sensor group, which includes two Hall sensors, and the two Hall sensors are communicatively connected to the controller.

3. The automotive actuator motor with encoder according to claim 1, characterized in that, The encoder is a magnetoelectric encoder, and the magnetic ring or code disk of the encoder is fixedly connected to the rotating shaft of the motor body.

4. The automotive actuator motor with encoder according to claim 2, characterized in that, The controller is equipped with a fault diagnosis circuit for switching between the encoder and the sensor group.

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