Motor reverse rotation braking circuit and electric kart

Abstract

The utility model provides a motor reverse rotation braking circuit and an electric kart, and the motor reverse rotation braking circuit comprises an acceleration control circuit, a braking control circuit, a relay control circuit, and a motor controller. Wherein the acceleration control circuit is used for generating an acceleration control signal; the brake control circuit is used for generating a brake control signal; the relay control circuit is used for detecting a brake control signal and correspondingly outputting an acceleration control signal and a forward rotation signal or the brake control signal and a reverse rotation signal according to a detection result; the forward and reverse rotation control end of the motor controller detects a forward rotation signal or a reverse rotation signal to control the motor to rotate forwards or reversely, and the speed regulation control end detects an acceleration control signal or a brake control signal to control the torque of the motor. According to the utility model, a braking scheme based on reverse rotation of the motor is realized, kinetic energy conversion is automatically realized through an existing motor control system, rapid braking is realized, and the core requirements of economy, reliability and rapid response in a low-speed scene are met.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle control, and in particular to a motor reversal braking circuit and an electric go-kart. Background Technology

[0002] With the continuous development of new energy technologies, electric go-karts have gradually become popular in training and education, entertainment venues, and family life. Existing electric go-karts use electric motors as their power source, and a motor controller manages the motor and other circuits.

[0003] To reduce costs, existing low-cost electric go-karts have simple braking systems. The motor controller is connected to the brake pedal via a brake control line. When the go-kart needs to brake, the user applies the brake pedal, the motor controller receives the braking signal from the brake pedal, and then disconnects the motor from the power supply to brake the go-kart. Due to inertia, the go-kart requires a relatively long braking distance to come to a complete stop, which cannot achieve rapid braking and cannot guarantee braking safety.

[0004] Therefore, existing technologies still need to be improved and developed. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a motor reversal braking circuit and an electric go-kart, thereby solving the problem that the existing low-cost motor controllers used in the prior art cannot brake quickly and pose safety hazards.

[0006] The technical solution of this utility model is as follows:

[0007] A motor reversal braking circuit for realizing the reversal braking of the motor of an electric go-kart, comprising: an acceleration control circuit, a braking control circuit, a relay control circuit, and a motor controller; wherein,

[0008] The acceleration control circuit is used to generate acceleration control signals;

[0009] The braking control circuit is used to generate braking control signals;

[0010] The control terminal of the relay control circuit is connected to the braking control circuit. The first input terminal of the relay control circuit is connected to the acceleration control circuit, and the second input terminal of the relay control circuit is connected to the braking control circuit. The first and second output terminals of the relay control circuit are both connected to the speed control terminal of the motor controller. The third input terminal of the relay control circuit is grounded, and the third output terminal of the relay control circuit is connected to the forward and reverse control terminal of the motor controller. The relay control circuit is used to receive braking control signals and output acceleration control signals and forward rotation signals, or braking control signals and reverse rotation signals, to the motor controller according to the magnitude of the braking signal.

[0011] The forward and reverse control terminals of the motor controller are respectively connected to the third output terminal of the relay control circuit, and the speed control terminal of the motor controller is respectively connected to the first output terminal and the second output terminal of the relay control circuit. The motor controller is used to control the motor to rotate forward or reverse according to the received forward or reverse signal, and to control the magnitude of the motor torque according to the received acceleration control signal or braking control signal.

[0012] In a further embodiment of this invention, the relay control circuit includes a dual-channel high-level trigger relay and a single-channel relay. The control terminal of the dual-channel high-level trigger relay is connected to the braking control circuit. The first normally closed terminal of the relay control circuit is connected to the acceleration control circuit. The first common terminal of the dual-channel high-level trigger relay is connected to the speed control terminal of the motor controller. The first normally open terminal of the dual-channel high-level trigger relay is left floating. The second normally closed terminal of the dual-channel high-level trigger relay is left floating. The second common terminal of the dual-channel high-level trigger relay is connected to the forward and reverse control terminal of the motor controller. The second normally open terminal of the dual-channel high-level trigger relay is grounded.

[0013] The control terminal of the single-channel relay is connected to the forward / reverse control terminal of the motor controller, the common terminal of the single-channel relay is connected to the braking control circuit, the normally closed terminal of the single-channel relay is left floating, and the normally open terminal of the single-channel relay is connected to the power control terminal of the motor controller.

[0014] In a further embodiment of this invention, the acceleration control circuit includes a Hall effect throttle sensor, and the braking control circuit includes a Hall effect brake sensor.

[0015] In a further embodiment of this invention, the single-channel relay is a low-level triggered relay; the single-channel relay is used to acquire the level value at the second common terminal of the dual-channel high-level triggered relay and compare it with a second signal threshold. When the level value at the second common terminal of the dual-channel high-level triggered relay is less than the second signal threshold, the common terminal is connected to the normally open terminal; otherwise, the common terminal is connected to the normally closed terminal.

[0016] In a further embodiment of this invention, the Hall effect throttle sensor or Hall effect brake sensor is model JT2-D 0-5V, with an operating voltage of 5V and an output load current of 10mA.

[0017] In a further embodiment of this invention, the motor controller is model YX-S1, with an operating voltage of 21-54V and a rated power of 350W, used to realize forward and reverse rotation of the motor and stepless speed regulation.

[0018] In a further embodiment of this invention, the motor reversing braking circuit also includes an ignition switch and an electric vehicle power supply. One end of the ignition switch is connected to the power supply terminal of the motor controller, and the other end of the ignition switch is connected to the electric vehicle power supply for receiving power supply voltage.

[0019] This utility model also provides an electric go-kart including the motor reversing braking circuit as described above, and further includes: a chassis, a frame, an accelerator pedal and a brake pedal; wherein, the frame is mounted on the chassis, the motor reversing braking circuit is disposed between the chassis and the frame, the accelerator pedal and the brake pedal are respectively connected to the motor reversing braking circuit, and the output terminal of the motor reversing braking circuit is connected to the motor.

[0020] In a further embodiment of this invention, the motor is a three-phase brushless DC motor.

[0021] The present invention provides a motor reversal braking circuit and an electric go-kart, which has the following advantages: it combines the characteristics of existing low-speed go-kart motor controllers, and controls the motor to reverse by quickly switching to reverse mode through the trigger braking control circuit, thereby generating a reversing torque and realizing a braking scheme based on motor reversal. The circuit is simple, easy to implement, and has good application prospects. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the motor controller in this utility model.

[0024] Figure 2 This is a circuit diagram of the motor reversing braking circuit in this utility model.

[0025] The labels in the attached diagram are as follows: 10, Acceleration control circuit; 11, Hall effect throttle sensor; 20, Braking control circuit; 21, Hall effect brake sensor; 30, Relay control circuit; 31, Dual-channel high-level trigger relay; 32, Single-channel relay; 40, Motor controller; 50, Motor; 60, Ignition switch; 70, Electric vehicle power supply. Detailed Implementation

[0026] This utility model provides a motor reversing braking circuit and an electric go-kart. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit this utility model.

[0027] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of this utility model involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0028] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0029] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0030] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] The inventors discovered that existing go-karts are commonly configured as mini, low-speed go-karts, employing electronic braking to reduce costs. Specifically, when the electric go-kart's motor is running normally, the current drives the rotor to rotate in a set direction for braking. At this time, the motor controller cuts off the forward current and briefly applies a reverse current, causing the motor to generate torque opposite to the direction of motion, achieving rapid deceleration and braking. However, a dedicated motor controller with reverse braking function is required to achieve this. This dedicated controller primarily uses internally programmed braking, and its cost is higher than that of controllers without reverse braking function. Existing motor controllers are inexpensive, but generally lack the ability to reverse brake for short periods, failing to meet current manufacturing requirements.

[0032] Furthermore, the existing motor controller schematic diagram is as follows: Figure 1As shown, the device includes a housing, a control circuit, and several control lines. The housing can be cuboid in shape. The control circuit can include logic circuits, integrated chips, or any signal processing unit. The control circuit of the motor controller is disposed within the housing. Holes are provided at both ends of the housing along its length. One end of each control line is connected to an external motor or control switch, and the other end is connected to the control circuit through the holes. The control lines include at least: a speed control line, a brake control line A, and a forward / reverse control line. The speed control line is the accelerator pedal control line, with one end connected to the accelerator pedal and the other end connected to the speed control terminal PW of the control circuit. One end of the brake control line A is connected to the brake pedal, and the other end is connected to the brake control terminal of the control circuit. One end of the forward / reverse control line is connected to a forward / reverse switch, and the other end is connected to the forward / reverse control terminal RD of the control circuit. After the electric go-kart starts, as the user depresses the accelerator pedal, the control signal output by the Hall sensor at the pedal changes accordingly. The motor controller receives this signal and controls the motor to rotate forward, propelling the vehicle forward. When braking is required, the user presses the brake pedal to a certain distance. The control circuit inside the motor controller receives the braking signal, disconnects the motor from the power supply, and the motor gradually stops rotating. At this point, manually pressing the forward / reverse switch causes the electrical signal detected by the motor controller's reverse control terminal to change from a high level to a low level, indicating that a reverse signal has been received and the vehicle has entered reverse control mode. The motor reverses, and pressing the accelerator pedal again initiates reverse motion.

[0033] It is evident that existing motor controllers primarily achieve braking of electric go-karts by disconnecting the motor from the power supply. Due to inertia, electric go-karts require a relatively long braking distance to come to a complete stop, and manual control of the motor's direction is necessary to control the go-kart's forward and backward movement. Reverse braking of the motor is not possible.

[0034] For the above technical issues, please refer to the following: Figure 1 and Figure 2This utility model discloses a motor reversal braking circuit that utilizes an existing motor controller to achieve rapid reversal braking of a motor. It includes: an acceleration control circuit 10, a braking control circuit 20, a relay control circuit 30, and a motor controller 40. The acceleration control circuit 10 generates an acceleration control signal; the braking control circuit 20 generates a braking control signal; the control terminal of the relay control circuit 30 is connected to the braking control circuit 20; the first input terminal of the relay control circuit 30 is connected to the acceleration control circuit 10; the second input terminal of the relay control circuit 30 is connected to the braking control circuit 20; and the first and second output terminals of the relay control circuit 30 are both connected to the speed control terminal of the motor controller 40. The third input terminal is grounded, and the third output terminal of the relay control circuit 30 is connected to the forward / reverse control terminal RD of the motor controller 40. The relay control circuit 30 is used to receive braking control signals and output acceleration control signals and forward rotation signals, or braking control signals and reverse rotation signals, to the motor controller 40 according to the magnitude of the braking signals. The forward / reverse control terminal RD of the motor controller 40 is connected to the third output terminal of the relay control circuit 30, and the speed control terminal of the motor controller 40 is connected to the first output terminal and the second output terminal of the relay control circuit 30, respectively. The motor controller 40 is used to control the motor to rotate forward or reverse according to the received forward or reverse rotation signals, and to control the magnitude of the motor torque according to the received acceleration control signals or braking control signals.

[0035] The motor 50 can be a three-phase brushless DC motor. The motor controller 40 can be a YX-S1 model, with an operating voltage of 21-54V and a rated power of 350W, enabling forward and reverse rotation and stepless speed regulation. The motor reversing braking circuit also includes an ignition switch 60 and an electric vehicle power supply 70. One end of the ignition switch 60 is connected to the power supply terminal of the motor controller 40, and the other end is connected to the electric vehicle power supply 70 for receiving power supply voltage. When the motor reversing braking circuit is working, the power supply terminal of the motor controller 40 is connected to the power supply voltage, and the operating voltage terminal VCC of the motor controller 40 is connected to the operating voltage terminals VCC of the acceleration control circuit 10, the braking control circuit 20, and the relay control circuit 30, respectively.

[0036] Specifically, when it is necessary to control the acceleration of motor 50, the output terminal of acceleration control circuit 10 generates an acceleration control signal. Relay control circuit 30 outputs an acceleration control signal and a forward rotation signal, or a braking control signal and a reverse rotation signal, to motor controller 40 based on the magnitude of the braking signal. Relay control circuit 30 may have a predetermined first signal threshold, which can be a high level of 3V to 5V, and compares the braking control signal with the first signal threshold. When the detected braking control signal is less than the first signal threshold, the first terminal of relay control circuit 30 is connected to the second terminal of relay control circuit 30. Acceleration control circuit 10 is then connected to the speed control terminal PW of motor controller 40 through relay control circuit 30. Motor controller 40 acquires the acceleration control signal, and motor 50 accelerates normally.

[0037] When rapid braking of motor 50 is required, the braking control circuit 20 outputs a braking control signal until the braking control signal is greater than or equal to the first signal threshold, at which point the first and second terminals of the relay control circuit 30 are turned off. At this time, even if the acceleration control circuit 10 outputs an acceleration control signal, it cannot control the rotation speed of motor 50. The forward / reverse control terminal RD of motor controller 40 is grounded through a dual-channel controller. Motor controller 40 controls motor 50 to enter reverse mode. When the first terminal of braking control circuit 20 receives the grounding signal at the forward / reverse control terminal RD, it outputs a braking control signal to the speed control terminal PW of motor controller 40 through the second terminal of braking control circuit 20. This quickly switches to reverse mode to control motor 50 to reverse, generating a reverse torque to prevent motor 50 from continuing to rotate forward, thus achieving rapid braking. When rapid braking is completed, the braking control signal output by the braking control circuit 20 is once again less than the first signal threshold. The forward and reverse control terminal RD of the motor controller 40 is disconnected from the ground terminal, and the motor 50 automatically returns to the forward rotation mode. The acceleration control circuit 10 is connected to the speed control terminal PW of the motor controller 40 through the relay control circuit 30 to achieve forward acceleration.

[0038] Furthermore, the relay control circuit 30 includes a dual-channel high-level trigger relay 31 and a single-channel relay 32. The dual-channel high-level trigger relay 31 may have a predetermined first signal threshold and compares the braking control signal with the first signal threshold. The single-channel relay 32 may have a predetermined second signal threshold and compares the speed control signal with the second signal threshold. The control terminal IN1 of the dual-channel high-level trigger relay 31 is connected to the braking control circuit 20; the first normally closed terminal NC1 of the relay control circuit is connected to the acceleration control circuit 10; the first common terminal COM1 of the dual-channel high-level trigger relay 31 is connected to the speed control terminal PW of the motor controller 40; the first normally open terminal NO1 of the dual-channel high-level trigger relay 31 is left floating; the second normally closed terminal NC2 of the dual-channel high-level trigger relay 31 is left floating; the second common terminal COM2 of the dual-channel high-level trigger relay 31 is connected to the forward / reverse control terminal RD of the motor controller 40; and the second normally open terminal NO2 of the dual-channel high-level trigger relay 31 is grounded. The control terminal IN2 of the single-channel relay 32 is connected to the forward / reverse control terminal RD of the motor controller 40; the common terminal COM3 of the single-channel relay 32 is connected to the braking control circuit 20; the normally closed terminal NC3 of the single-channel relay 32 is left floating; and the normally open terminal NO3 of the single-channel relay 32 is connected to the power control terminal of the motor controller.

[0039] In the braking control circuit, the dual-channel high-level trigger relay 31 is a high-level trigger relay, and the single-channel relay 32 is a low-level trigger relay. In this preferred embodiment, the first voltage threshold and the second voltage threshold are the trigger voltages of the control terminal IN1 of the dual-channel high-level trigger relay 31 and the control terminal IN2 of the single-channel relay 32, respectively. The first voltage threshold can be any value between 3V and 5V, and the second voltage threshold can be any value between 0V and 4V. Preferably, the first voltage threshold can be set to 3.3V or 5V, and the second voltage threshold can be set to 0.4V. The single-channel relay 32 is used to collect the level value at the second common terminal COM2 of the dual-channel high-level trigger relay 31 and compare it with the second signal threshold. When the speed control signal at the second common terminal COM2 of the dual-channel high-level trigger relay 31 is less than the second signal threshold, the common terminal COM3 of the single-channel relay 32 is connected to the normally open terminal NO3, and the braking control signal output in the braking control circuit 20 is input to the speed control terminal of the motor controller; otherwise, the common terminal COM3 is connected to the normally closed terminal NC3.

[0040] Furthermore, the acceleration control circuit 10 includes a Hall effect throttle sensor 11, and the braking control circuit 20 includes a Hall effect brake sensor 21 and a single-channel relay 32. In specific implementation, when the ignition switch 60 is turned on, the power supply provides power to the motor controller 40. The working voltage terminal VCC of the motor controller 40 outputs a 5V voltage to provide working voltage to the Hall effect throttle sensor 11, the Hall effect brake sensor, the dual-channel high-level trigger relay 31, and the single-channel relay 32. At this time, the first normally closed terminal NC1 and the first common terminal COM1 of the dual-channel high-level trigger relay 31 are closed, the second normally open terminal NO2 and the second common terminal COM2 are open, and the normally open terminal NO3 and the common terminal COM3 of the single-channel relay 32 are open, and the circuit enters the pre-operation state.

[0041] When the accelerator pedal is pressed, the OUT1 terminal of the Hall effect throttle sensor 11 outputs an acceleration control signal. This signal is transmitted to the speed control terminal PW of the motor controller 40 through the first normally closed terminal NC1 and the first common terminal COM1 of the dual-channel high-level trigger relay 31 module in the on state. The motor controller 40 controls the motor 50 to rotate forward, and the electric vehicle moves forward. As the signal from the Hall effect throttle sensor 11 increases, the speed of the motor 50 increases, and the vehicle speed increases.

[0042] When the electric vehicle needs to brake while driving, pressing the brake pedal will cause the Hall effect brake sensor output terminal OUT2 to output a braking control signal. When the voltage value of the braking control signal is greater than 3.0V, the first normally closed terminal NC1 and the first common terminal COM1 of the dual-channel high-level trigger relay 31 module will disconnect, the output signal of the Hall effect throttle sensor OUT1 of the accelerator pedal will be disconnected, the speed control terminal PW of the motor controller 40 will not receive a control signal, the power supply to the motor 50 will be disconnected, and the forward drive will stop. At the same time, the second normally open terminal NO2 and the second common terminal COM2 of the dual-channel high-level trigger relay 31 module will close and conduct, the reversing signal terminal of the motor controller 40 will be connected to the GND ground terminal, the speed control signal will be low, less than the second voltage threshold, the motor controller 40 will enter the reversing mode, and the motor 50 will reverse. When the second normally open terminal NO2 and the second common terminal COM2 of the dual-channel high-level trigger relay 31 module are closed and conducting, the normally open terminal NO3 and the common terminal COM3 of the single-channel relay 32 module are connected. The output terminal OUT2 of the Hall effect brake sensor outputs a braking control signal to the speed control terminal PW of the motor controller 40. The motor controller 40 controls the motor 50 to reverse, generating torque to achieve braking. At this time, the larger the voltage value of the braking control signal output by the Hall effect brake sensor, the greater the reversing torque of the motor 50, and the stronger the braking force.

[0043] When the brake pedal is released, and the braking output signal from the Hall effect brake sensor is less than 1.5V, the first normally closed terminal NC1 and the first common terminal COM1 of the dual-channel high-level trigger relay 31 module close, while the second normally open terminal NO2 and the second common terminal COM2 open, and the motor controller 40 enters forward mode. Since the second normally open terminal NO2 and the second common terminal COM2 of the dual-channel high-level trigger relay 31 module are open, the speed control signal is high, and the control terminal IN2 of the single-channel relay 32 module receives a high level, causing the normally open terminal NO3 and the common terminal COM3 to open. At this time, the first normally closed terminal NC1 and the first common terminal COM1 of the dual-channel high-level trigger relay 31 module close, completing the circuit between the accelerator pedal, the Hall effect throttle sensor 11, and the motor controller 40. The speed control terminal PW of the motor controller 40 receives the acceleration control signal, and the motor controller 40 supplies power to the motor 50 for forward rotation control.

[0044] Based on the same inventive concept, this utility model also provides an electric go-kart, including: a motor reversing braking circuit, a chassis, a frame, an accelerator pedal, and a brake pedal as described above; wherein, the frame is mounted on the chassis, the motor reversing braking circuit is disposed between the chassis and the frame, the accelerator pedal and the brake pedal are respectively connected to the motor reversing braking circuit, and the output terminal of the motor reversing braking circuit is connected to the motor. The specifics are as described in the motor reversing braking circuit description, and will not be repeated here.

[0045] This utility model provides a motor reversal braking circuit and an electric go-kart. The motor reversal braking circuit, used to achieve reversal braking of the electric go-kart's motor, includes: an acceleration control circuit, a braking control circuit, a relay control circuit, and a motor controller. The acceleration control circuit generates an acceleration control signal; the braking control circuit generates a braking control signal; the control terminal of the relay control circuit is connected to the braking control circuit; the first input terminal of the relay control circuit is connected to the acceleration control circuit; the second input terminal of the relay control circuit is connected to the braking control circuit; and the first and second output terminals of the relay control circuit are both connected to the speed control terminal of the motor controller. The third input terminal of the circuit is grounded, and the third output terminal of the relay control circuit is connected to the forward and reverse control terminal of the motor controller. The relay control circuit receives braking control signals and outputs acceleration control signals and forward rotation signals, or braking control signals and reverse rotation signals, to the motor controller according to the magnitude of the braking signals. The forward and reverse control terminals of the motor controller are respectively connected to the third output terminal of the relay control circuit, and the speed control terminals of the motor controller are respectively connected to the first output terminal and the second output terminal of the relay control circuit. The motor controller controls the motor to rotate forward or reverse according to the received forward or reverse rotation signals, and controls the magnitude of the motor torque according to the received acceleration control signals or braking control signals. This utility model combines the characteristics of existing low-speed go-kart motor controllers to realize a braking scheme based on motor reversal. By automatically realizing kinetic energy conversion through the existing motor control system, deceleration is achieved in a short time, and the braking effect is significant, meeting the core requirements of economy, reliability, and rapid response in low-speed scenarios.

[0046] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A motor reversing braking circuit for realizing reversing braking of the motor of an electric go-kart, characterized in that, include: Acceleration control circuit, braking control circuit, relay control circuit, and motor controller; among which, The acceleration control circuit is used to generate acceleration control signals; The braking control circuit is used to generate braking control signals; The control terminal of the relay control circuit is connected to the braking control circuit. The first input terminal of the relay control circuit is connected to the acceleration control circuit, and the second input terminal of the relay control circuit is connected to the braking control circuit. The first and second output terminals of the relay control circuit are both connected to the speed control terminal of the motor controller. The third input terminal of the relay control circuit is grounded, and the third output terminal of the relay control circuit is connected to the forward and reverse control terminal of the motor controller. The relay control circuit is used to receive braking control signals and output acceleration control signals and forward rotation signals, or braking control signals and reverse rotation signals, to the motor controller according to the magnitude of the braking signal. The forward and reverse control terminals of the motor controller are respectively connected to the third output terminal of the relay control circuit, and the speed control terminal of the motor controller is respectively connected to the first output terminal and the second output terminal of the relay control circuit. The motor controller is used to control the motor to rotate forward or reverse according to the received forward or reverse signal, and to control the magnitude of the motor torque according to the received acceleration control signal or braking control signal.

2. The motor reversing braking circuit as described in claim 1, characterized in that, The relay control circuit includes a dual-channel high-level trigger relay and a single-channel relay. The control terminal of the dual-channel high-level trigger relay is connected to the braking control circuit. The first normally closed terminal of the relay control circuit is connected to the acceleration control circuit. The first common terminal of the dual-channel high-level trigger relay is connected to the speed control terminal of the motor controller. The first normally open terminal of the dual-channel high-level trigger relay is left floating. The second normally closed terminal of the dual-channel high-level trigger relay is left floating. The second common terminal of the dual-channel high-level trigger relay is connected to the forward and reverse control terminal of the motor controller. The second normally open terminal of the dual-channel high-level trigger relay is grounded. The control terminal of the single-channel relay is connected to the forward / reverse control terminal of the motor controller, the common terminal of the single-channel relay is connected to the braking control circuit, the normally closed terminal of the single-channel relay is left floating, and the normally open terminal of the single-channel relay is connected to the power control terminal of the motor controller.

3. The motor reversing braking circuit as described in claim 2, characterized in that, The acceleration control circuit includes a Hall effect throttle sensor, and the braking control circuit includes a Hall effect brake sensor.

4. The motor reversing braking circuit as described in claim 3, characterized in that, The single-channel relay is a low-level triggered relay; the single-channel relay is used to collect the level value at the second common terminal of the relay control circuit and compare it with the second signal threshold. When the level value at the second common terminal of the relay control circuit is less than the second signal threshold, the common terminal is connected to the normally open terminal; otherwise, the common terminal is connected to the normally closed terminal.

5. The motor reversing braking circuit as described in claim 3, characterized in that, The Hall effect throttle sensor or Hall effect brake sensor is model JT2-D 0-5V, with an operating voltage of 5V and an output load current of 10mA.

6. The motor reversing braking circuit as described in claim 1, characterized in that, The motor controller is model YX-S1, with an operating voltage of 21-54V and a rated power of 350W. It is used to realize the forward and reverse rotation of the motor and stepless speed regulation.

7. The motor reversing braking circuit as described in claim 1, characterized in that, It also includes an ignition switch and an electric vehicle power supply. One end of the ignition switch is connected to the power supply terminal of the motor controller, and the other end of the ignition switch is connected to the electric vehicle power supply for connecting to the power supply voltage.

8. An electric go-kart comprising a motor reversing braking circuit as described in any one of claims 1-7, characterized in that, Also includes: The vehicle includes a chassis, a frame, an accelerator pedal, a brake pedal, and a motor. The frame is mounted on the chassis, and the motor reversing braking circuit, accelerator pedal, brake pedal, and motor are located between the chassis and the frame. The accelerator pedal and brake pedal are connected to the input terminal of the motor reversing braking circuit, and the output terminal of the motor reversing braking circuit is connected to the motor.

9. The electric go-kart as described in claim 8, characterized in that, The motor is a three-phase brushless DC motor.

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