High-speed grounding switch based on servo motor driving and servo system

Abstract

The invention discloses a high-speed grounding switch based on servo motor driving and a servo system, and relates to the technical field of high-voltage switches, and the high-speed grounding switch comprises a supporting unit which comprises a mounting shell and a supporting frame arranged on the mounting shell; the driving unit comprises a driving motor arranged on the supporting frame, a driving part arranged on the driving motor and a transmission part arranged on the driving motor. Based on the quick response characteristic of the servo motor, the switch-on and switch-off operation of the grounding switch is quicker, fluctuation and vibration in the power transmission process are reduced through accurate control of the servo motor and stable transmission of the connecting rod, the operation stability of the grounding switch is improved, transmission parts are reduced through the optimized structural design, the fault probability is reduced, and the service life of the grounding switch is prolonged. And the long-term use reliability of the grounding switch is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage switches, and in particular to a fast grounding switch and a servo system driven by a servo motor. Background Art

[0002] In the power system, the fast grounding switch is one of the important equipment to ensure the safe and stable operation of the power grid. The traditional grounding switch has problems such as unstable power transmission, slow response speed, and easy jamming during the opening and closing process, which affects the overall performance and safety of the power system. Therefore, it is particularly important to develop a new type of fast grounding switch to overcome the shortcomings of the existing technology.

[0003] Traditional high-voltage switchgear uses motors and spring mechanisms to drive, which have disadvantages such as poor flexibility and large operating impact. With the rapid development of modern rare earth permanent magnet motor technology, power electronics technology, motor vector control technology and mechanical design technology, new servo motors and their control systems are getting closer and closer to the requirements of high-voltage switch operation in terms of torque output capacity, rotor inertia, response time and follow-up ability, and their output angle, speed and energy control performance are getting higher and higher, which lays the foundation for new motor operating mechanisms used in high-voltage switches. Using servo motors to drive operating mechanisms is an important topic in the current power industry. Summary of the invention

[0004] In view of the above problems existing in the existing fast grounding switch and servo system driven by a servo motor, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide a fast grounding switch driven by a servo motor, which aims to solve the problems of unstable power transmission, slow response speed, easy jamming, etc. of traditional grounding switches during the opening and closing process.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising:

[0007] The support unit comprises a mounting shell and a support frame arranged on the mounting shell;

[0008] The driving unit includes a driving motor arranged on the supporting frame, a driving part arranged on the driving motor, and a transmission part arranged on the driving motor.

[0009] As a preferred solution of the servo motor driven fast grounding switch described in the present invention, the driving part includes a driving component arranged on the driving motor, and a limiting component arranged on the driving component.

[0010] As a preferred solution of the servo motor-driven fast grounding switch described in the present invention, the driving assembly includes a motor crank arm arranged on the driving motor, a connecting rod connected to the motor crank arm, and a spindle crank arm arranged on the connecting rod.

[0011] As a preferred solution of the servo motor driven fast grounding switch described in the present invention, the limiting assembly includes a limiting ring arranged on the motor crank arm, and a limiting screw arranged on the motor crank arm.

[0012] As a preferred solution of the servo motor-driven fast earthing switch described in the present invention, the transmission part includes a transmission component arranged on the main shaft crank arm, and a linkage component arranged on the transmission component.

[0013] As a preferred solution of the servo motor-driven fast grounding switch described in the present invention, the transmission assembly includes an inner crank arm arranged on the main shaft crank arm, a guide rod connected to the inner crank arm, and a guide frame arranged on the guide rod.

[0014] As a preferred solution of the servo motor-driven fast grounding switch described in the present invention, the linkage assembly includes an intermediate contact finger arranged at one end of the guide rod away from the guide frame, and a moving contact arranged at one end of the intermediate contact finger away from the guide rod.

[0015] As a preferred solution of the servo motor driven fast grounding switch described in the present invention, the dead point is where the center axis of the motor crank arm and the center axis of the connecting rod pin hole are colinear.

[0016] As a preferred solution of the servo motor-driven fast grounding switch of the present invention, the angle at which the motor crank arm moves past the dead point is 2 to 5 degrees.

[0017] Another object of the present invention is to overcome the existing technical problems and provide a servo system based on servo motor drive, comprising: a fast grounding switch based on servo motor drive, and also comprising a servo driver, which, after receiving a control command, sends a signal to the drive motor and drives it to move;

[0018] The encoder feeds back the motion parameters of the drive motor to the servo driver to form a closed-loop control system.

[0019] The beneficial effects of the present invention are: improving the response speed: the fast response characteristics of the servo motor make the opening and closing operations of the grounding switch faster.

[0020] Enhanced stability: The precise control of the servo motor and the stable transmission of the connecting rod reduce the fluctuation and vibration during power transmission and improve the operational stability of the grounding switch.

[0021] Improve reliability: The optimized structural design reduces transmission parts, reduces the probability of failure, and ensures the long-term reliability of the grounding switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0023] Figure 1 The figure is a schematic diagram of the overall structure of the fast grounding switch driven by a servo motor according to the present invention.

[0024] Figure 2 The figure is a schematic diagram of the working principle of the fast grounding switch driven by a servo motor according to the present invention.

[0025] Figure 3 The figure is a schematic diagram of the structure of the driving part of the fast grounding switch driven by a servo motor according to the present invention.

[0026] Figure 4 The figure is a schematic diagram of the working principle of the servo system driven by a servo motor according to the present invention.

[0027] Figure 5 The figure is a schematic structural diagram of the transmission part of the fast earthing switch driven by a servo motor according to the present invention.

[0028] Figure 6 The diagram is a schematic diagram of the opening and closing positions of the fast earthing switch driven by a servo motor according to the present invention. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0033] Example 1

[0034] Reference Figure 1-3 , which is the first embodiment of the present invention, provides a fast earthing switch based on servo motor drive, the device includes a support unit 100, including a mounting shell 101, and a support frame 102 arranged on the mounting shell 101, the mounting shell 101 is the external structure of the entire fast earthing switch, it provides physical protection and support for the internal mechanical and electrical components, and can ensure the long-term stable operation of the internal components; it is convenient for overall installation and maintenance, the support frame 102 is used to fix and support the entire device, so that the device maintains the correct position and alignment during operation to achieve precise motion transmission.

[0035] The drive unit 200 includes a drive motor 201 arranged on the support frame 102, a drive part 202 arranged on the drive motor 201, and a transmission part 203 arranged on the drive motor 201. The drive motor 201 is the power source of the entire device, which can accurately control the rotation speed and position, and can also start and stop quickly, thereby improving the response speed of the grounding switch. The drive part 202 is an intermediate component connecting the drive motor 201 and the grounding switch operating mechanism, which converts the rotational motion of the motor into linear motion or the required specific motion to operate the grounding switch. The transmission part 203 can transmit the motion of the drive part 202 to the actual operating mechanism of the grounding switch, such as a contact or a switch, to realize opening and closing, thereby ensuring the stable transmission of the motion and reducing the error in the transmission process.

[0036] Among them, the driving part 202 includes a driving component 202a arranged on the driving motor 201, and a limiting component 202b arranged on the driving component 202a. The driving component 202a is a mechanical structure directly connected to the driving motor 201. It transmits the force generated by the driving motor 201 to the operating mechanism of the grounding switch. The function of the limiting component 202b is to limit the movement range of the driving component 202a, ensure that the grounding switch moves within a safe operating range, prevent excessive movement from causing equipment damage or operating errors, protect the driving motor 201 and the grounding switch, ensure that the grounding switch operates within safe limits, avoid possible safety risks, and reduce the possibility of equipment damage due to operating errors.

[0037] The driving assembly 202a includes a motor crank arm 202a-1 arranged on the driving motor 201, a connecting rod 202a-2 connected to the motor crank arm 202a-1, and a main shaft crank arm 202a-3 arranged on the connecting rod 202a-2. The motor crank arm 202a-1 is a key component for realizing the conversion from rotational motion to linear motion. The connecting rod 202a-2 can ensure that the force and motion are smoothly transmitted from the motor crank arm 202a-1 to the main shaft crank arm 202a-3, reducing energy loss and motion deviation. The main shaft crank arm 202a-3 continues to transmit force and motion until the final operating point is reached, ensuring that the force and motion are accurately transmitted to the operating mechanism of the grounding switch to realize accurate opening and closing operations.

[0038] During use, the staff turns on the drive motor 201, so that the drive motor 201 transmits the action to the transmission part 203 through the drive part 202, so that the transmission part 203 moves to realize the opening and closing operation, and under the action of the limit assembly 202b, the device always works within the safety limit.

[0039] Example 2

[0040] Reference Figure 1-6 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the transmission part 203 includes a transmission component 203a arranged on the main shaft arm 202a-3, and a linkage component 203b arranged on the transmission component 203a. The transmission component 203a continues to transmit force and motion to ensure that the power is effectively transmitted from the drive motor 201 to the grounding switch to achieve precise control. The linkage component 203b is responsible for the final opening and closing actions to ensure that the grounding switch can accurately perform opening and closing operations. In a multi-contact grounding switch, the linkage component 203b can ensure that all contacts operate synchronously to avoid failures caused by asynchronous operation.

[0041] Compared with Example 1, further, the transmission assembly 203a includes an inner crank arm 203a-1 arranged on the main shaft crank arm 202a-3, a guide rod 203a-2 connected to the inner crank arm 203a-1, and a guide frame 203a-3 arranged on the guide rod 203a-2. When the inner crank arm 203a-1 rotates, it drives the guide rod 203a-2 to move. One end of the guide rod 203a-2 is limited by the guide frame 203a-3 to make a linear motion along the guide frame 203a-3, and one end of the guide rod 203a-2 moves in a vertical direction, so that the lateral force brought by the swing of the inner crank arm 203a-1 is limited between the guide rod 203a-2 and the guide frame 203a-3, thereby reducing the friction of the linkage assembly 203b.

[0042] Compared with Example 1, further, the linkage assembly 203b includes an intermediate contact finger 203b-1 arranged at the end of the guide rod 203a-2 away from the guide frame 203a-3, and a moving contact 203b-2 arranged at the end of the intermediate contact finger 203b-1 away from the guide rod 203a-2. Since the lateral force caused by the swing of the inner crank arm 203a-1 is limited between the guide rod 203a-2 and the guide frame 203a-3, the friction between the moving contact 203b-2 and the intermediate contact finger 203b-1 is reduced, thereby improving the reliability and durability of the grounding switch.

[0043] Compared with Example 1, further, the point where the center axis of the motor crank arm 202a-1 and the center axis of the pin hole of the connecting rod 202a-2 are collinear is the dead point K. When the motor crank arm 202a-1 and the connecting rod 202a-2 are collinear, the force transmitted to the motor crank arm 202a-1 by the main shaft crank arm 202a-3 will pass through the center of the main shaft of the driving motor 201, that is, the dead point K position. This force does not generate torque, and the motor crank arm 202a-1 cannot rotate at this time, thereby realizing self-locking of the switch contacts.

[0044] Compared with Example 1, further, the angle m at which the motor crank arm 202a-1 moves past the dead point K is 2 to 5°. When the switch is closed or opened and the drive motor 201 loses power, the spindle crank arm 202a-3 cannot rotate past the dead point K. When the spindle crank arm 202a-3 rotates forward, it is locked by the limit ring 202b-1 and the limit screw 202b-2, thereby achieving position locking and preventing the switch contacts from moving.

[0045] The remaining structures are the same as those of Example 1.

[0046] Example 3

[0047] Reference Figure 1-6 , which is the third embodiment of the present invention, this embodiment provides a servo system based on servo motor drive, including a fast grounding switch based on servo motor drive, and also including,

[0048] After receiving the control command, the servo driver 300 sends a signal to the drive motor 201 and drives it to move;

[0049] The encoder 400 feeds back the motion parameters of the drive motor 201 to the servo driver 300 to form a closed-loop control system.

[0050] The control principle of the servo driver 300 is mainly based on a closed-loop control system. By accurately controlling the motion state of the drive motor 201, precise control of the controlled object is achieved. The servo driver 300 receives instructions from the encoder 400, including target values ​​of control parameters such as position, speed or torque, and performs signal processing on the received instructions, including decoding, filtering, sampling and other operations to ensure the accuracy and stability of the signal.

[0051] The encoder 400 can monitor the motion state (such as position, speed, etc.) of the drive motor 201 in real time, and send the feedback information to the servo driver 300. The servo driver 300 compares the feedback value with the target value, calculates the error signal, and adjusts the control parameters of the drive motor 201 through the PID (proportional-integral-differential) regulator according to the size and change trend of the error signal. The PID regulator can combine the past, present and future trends of the error to calculate the optimal control amount to reduce the error.

[0052] According to the output of the PID regulator, the current of the drive motor 201 is controlled by the current controller. The current controller adjusts the current size and direction of the drive motor 201 according to the instruction of the PID regulator to achieve accurate control of the motor torque.

[0053] The output signal of the current controller is converted into a driving signal, and the driving circuit drives the driving motor 201 to work, thereby ensuring that the driving motor 201 can accurately operate according to the control instruction.

[0054] The high-power service motor adopts an absolute encoder magnetic encoder chip, which has a unique mechanical position. The absolute position of the rotor can still be read after restarting. The reading is accurate and reliable. It can accurately drive the moving contact 203b-2 to move through the transmission connecting rod 202a-2, and return the real-time and accurate position of the rotor and contact of the drive motor 201 in real time.

[0055] The detection resolution of the magnetic encoding signal chip is 14 bits, that is, the output value of the chip is 0~16384 when the motor rotor rotates one circle, and the detection accuracy is ±0.2°. The chip also has strong anti-electromagnetic interference ability and extremely fast data transmission speed, which can meet the position detection needs of the servo drive 300. It is also equipped with four communication interfaces: ABI, SPI, PWM, and UVW, and the communication method can be freely selected to read the position information. Due to the high integration of the chip, it only needs to be connected to the circuit and the communication circuit is reserved.

[0056] The remaining structure is the same as that of Example 2.

[0057] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, improvements, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0058] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0059] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A fast grounding switch driven by a servo motor, characterized in that: include, A support unit (100) comprises a mounting shell (101) and a support frame (102) arranged on the mounting shell (101); The driving unit (200) comprises a driving motor (201) arranged on the support frame (102), a driving part (202) arranged on the driving motor (201), and a transmission part (203) arranged on the driving motor (201).

2. The fast grounding switch driven by a servo motor according to claim 1, characterized in that: The driving part (202) comprises a driving component (202a) arranged on the driving motor (201), and a limiting component (202b) arranged on the driving component (202a).

3. The fast grounding switch driven by a servo motor according to claim 2, characterized in that: The driving assembly (202a) comprises a motor crank arm (202a-1) arranged on the driving motor (201), a connecting rod (202a-2) connected to the motor crank arm (202a-1), and a main shaft crank arm (202a-3) arranged on the connecting rod (202a-2).

4. The fast grounding switch driven by a servo motor according to claim 3, characterized in that: The limiting assembly (202b) comprises a limiting ring (202b-1) arranged on the motor crank arm (202a-1), and a limiting screw (202b-2) arranged on the motor crank arm (202a-1).

5. The fast grounding switch driven by a servo motor according to claim 4, characterized in that: The transmission part (203) comprises a transmission component (203a) arranged on the main shaft crank arm (202a-3), and a linkage component (203b) arranged on the transmission component (203a).

6. The fast grounding switch driven by a servo motor according to claim 5, characterized in that: The transmission assembly (203a) comprises an inner crank arm (203a-1) arranged on the main shaft crank arm (202a-3), a guide rod (203a-2) connected to the inner crank arm (203a-1), and a guide frame (203a-3) arranged on the guide rod (203a-2).

7. The fast grounding switch driven by a servo motor according to claim 6, characterized in that: The linkage assembly (203b) comprises an intermediate contact finger (203b-1) arranged at one end of the guide rod (203a-2) away from the guide frame (203a-3), and a moving contact (203b-2) arranged at one end of the intermediate contact finger (203b-1) away from the guide rod (203a-2).

8. The fast grounding switch driven by a servo motor according to claim 7, characterized in that: The dead point (K) is where the center axis of the motor crank arm (202a-1) and the center axis of the pin hole of the connecting rod (202a-2) are colinear.

9. The fast grounding switch driven by a servo motor according to claim 8, characterized in that: The angle (m) at which the motor crank arm (202a-1) moves past the dead point (K) is 2-5°.

10. A servo system based on servo motor drive, characterized in that: The servo motor driven fast grounding switch according to any one of claims 1 to 9 further comprises: The servo driver (300), after receiving the control command, sends a signal to the drive motor (201) to drive the drive motor to move; The encoder (400) feeds back the motion parameters of the drive motor (201) to the servo driver (300) to form a closed-loop control system.

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