Resistance generating device and fitness bike

Abstract

The present invention relates to the technical field of fitness equipment. The present invention discloses a resistance generating device and a fitness bike, wherein the resistance generating device includes a power supply circuit, a first switch circuit, a second switch circuit, an electric energy consumption unit, a motor control board, a motor drive circuit and a permanent magnet synchronous motor, the power supply circuit supplies power to the entire resistance generating device, an output end of the power supply circuit is connected to the DC input end of the motor drive circuit through the first switch circuit, the AC output end of the motor drive circuit is connected to the input end of the permanent magnet synchronous motor, the DC output end of the motor drive circuit is connected to the electric energy consumption unit through the second switch circuit, and the control ends of the first switch circuit, the second switch circuit and the motor drive circuit are respectively connected to the control output end of the motor control board. The present invention can provide resistance for exercise and power to help users recover from exercise, has diverse functions, improves user experience, and has a simple structure and low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of fitness equipment, and in particular relates to a resistance generating device and a fitness bike. Background Art

[0002] With the development of society and the improvement of living standards, people's health awareness is getting stronger and stronger, and more and more people like to use fitness equipment for fitness. Fitness bikes are typical aerobic fitness equipment that simulates outdoor sports, also known as cardiopulmonary training equipment. They mainly promote cardiovascular exercise, speed up metabolism, enhance heart and lung function, and improve human physique through long-term and appropriate intensity exercise. Fitness bikes have become a very popular form of fitness in fitness clubs and community activity centers, and are increasingly entering ordinary people's homes.

[0003] The resistance generating devices of existing fitness bikes are generally divided into two categories, magnetic control resistance and friction resistance, both of which have relatively simple functions and can only provide a single resistance but cannot provide power. After a certain intensity of cycling exercise, the muscles of people will become stiff. At this time, if power (external force) can be provided to drive the limbs to continue to move, the muscles can be relaxed, the blood can be circulated, and the body recovery can be promoted. Obviously, the resistance generating devices of existing fitness bikes cannot achieve the exercise recovery function. If a power generating device is added, the structural complexity and manufacturing cost of the fitness bike will be increased. Summary of the invention

[0004] The purpose of the present invention is to provide a resistance generating device and a fitness bike to solve the above-mentioned technical problems.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a resistance generating device, comprising a power supply circuit, a first switch circuit, a second switch circuit, an electric energy consumption unit, a motor control board, a motor drive circuit and a permanent magnet synchronous motor, wherein the power supply circuit supplies power to the entire resistance generating device, an output end of the power supply circuit is connected to a DC input end of the motor drive circuit through the first switch circuit, an AC output end of the motor drive circuit is connected to an input end of the permanent magnet synchronous motor, a DC output end of the motor drive circuit is connected to the electric energy consumption unit through the second switch circuit, the control ends of the first switch circuit, the second switch circuit and the motor drive circuit are respectively connected to the control output end of the motor control board, when in the power mode, the motor control board controls the first switch circuit to be turned on, the second switch circuit to be turned off, and controls the motor drive circuit to drive the permanent magnet synchronous motor to rotate accordingly; when in the resistance mode, the motor control board controls the second switch circuit to be turned on, the first switch circuit to be turned off, and controls the permanent magnet synchronous motor to output corresponding resistance through the motor drive circuit.

[0006] Furthermore, the electric energy consumption unit is a power resistor.

[0007] Furthermore, the motor control board includes a main control unit, a bus voltage measurement circuit, a current measurement circuit and a motor speed measurement circuit. The bus voltage measurement circuit is used to measure the voltage of the DC bus and output it to the main control unit. The current measurement circuit and the motor speed measurement circuit are used to measure the phase current and speed of the permanent magnet synchronous motor respectively and output them to the main control unit. The main control unit performs corresponding FOC closed-loop control according to the voltage of the DC bus, the phase current and the speed of the permanent magnet synchronous motor.

[0008] Furthermore, the motor drive circuit is implemented using a half-bridge driver and power.

[0009] Furthermore, the first switch circuit and the second switch circuit both use power MOS tubes for on-off switching, and are controlled by a PWM signal output by a motor control board.

[0010] Furthermore, the power supply circuit includes an AC / DC circuit, a voltage stabilizing circuit and a voltage step-down circuit. The input end of the AC / DC circuit is connected to an AC input, and the output end of the AC / DC circuit is connected to a DC input end of a motor drive circuit through a first switching circuit. At the same time, the voltage stabilizing circuit and the voltage step-down circuit are used to power other electronic devices of the resistance generating device.

[0011] Furthermore, it includes a meter, which is communicatively connected with the motor control board.

[0012] Furthermore, the permanent magnet synchronous motor is hub-shaped and is nested on an annular counterweight.

[0013] The present invention also provides a fitness bike provided with the above-mentioned resistance generating device.

[0014] Beneficial technical effects of the present invention:

[0015] The resistance generating device of the present invention can provide resistance for exercise and power to help users recover from exercise. It has diverse functions and improves user experience. The same device is used to provide resistance and power, which effectively reduces the complexity of the structure and manufacturing cost of the fitness vehicle and provides more space for the design of the fitness vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. 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 paying creative work.

[0017] Figure 1 A circuit block diagram of a resistance generating device according to a specific embodiment of the present invention;

[0018] Figure 2 It is a partial specific circuit diagram of the resistance generating device of a specific embodiment of the present invention;

[0019] Figure 3 Another specific circuit diagram of a resistance generating device according to a specific embodiment of the present invention;

[0020] Figure 4 It is a schematic structural diagram of a fitness bike according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0021] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0022] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0023] like Figure 1-3 As shown, a resistance generating device comprises a power supply circuit 1, a first switch circuit 2, a second switch circuit 3, an electric energy consumption unit 7, a motor control board, a motor drive circuit 4 and a permanent magnet synchronous motor 5, wherein the power supply circuit 1 supplies power to the entire resistance generating device, an output end of the power supply circuit 1 is connected to a DC input end of the motor drive circuit 4 through the first switch circuit 2, an AC output end of the motor drive circuit 4 is connected to an input end of the permanent magnet synchronous motor 5, a DC output end of the motor drive circuit 4 (which is the same port as the DC input end) is connected to the electric energy consumption unit 7 through the second switch circuit 3, and control ends of the first switch circuit 2, the second switch circuit 3 and the motor drive circuit 4 are respectively connected to the control output end of the motor control board, and when in power mode When in the resistance mode (also known as the exercise mode), the motor control board controls the second switch circuit 3 to be turned on, the second switch circuit 3 to be turned off, the power supply circuit 1 supplies power to the motor drive circuit 4, and the motor control board controls the motor drive circuit 4 to drive the permanent magnet synchronous motor 5 to rotate accordingly, that is, to rotate at the set speed to provide power; when in the resistance mode (also known as the exercise mode), the motor control board controls the second switch circuit 3 to be turned on, the first switch circuit 2 to be turned off, and the permanent magnet synchronous motor 5 is controlled by the motor drive circuit 4 to output the corresponding resistance (torque), that is, to output the set resistance. The electric energy generated by the user driving the permanent magnet synchronous motor 5 to rotate under the set resistance is converted into direct current by the motor drive circuit 4 and output to the power consumption unit 7 through the second switch circuit 3 for dissipation.

[0024] In this specific embodiment, the power consumption unit 7 is preferably a power resistor, which is easy to implement and has low cost, but is not limited to this. In other embodiments, other devices that can consume power can also be used to implement it.

[0025] In this specific embodiment, the motor control board uses FOC (field oriented control) control to control the permanent magnet synchronous motor 5, which has high real-time performance and accuracy. FOC control is a very mature technology. For details, please refer to the existing technology and will not be described in detail here.

[0026] Correspondingly, in this specific embodiment, the motor control board includes a main control unit 6, a bus voltage measurement circuit 10, a current measurement circuit 8 and a motor speed measurement circuit 9. The bus voltage measurement circuit 10 is used to measure the voltage of the DC bus (connected to the DC input terminal of the motor drive circuit 4) and output it to the main control unit 6. The current measurement circuit 8 and the motor speed measurement circuit 9 are respectively used to measure the phase current and speed of the permanent magnet synchronous motor 5 and output them to the main control unit 6. The main control unit 6 performs corresponding FOC closed-loop control according to the voltage of the DC bus, the phase current and the speed of the permanent magnet synchronous motor 5.

[0027] In this specific embodiment, the motor speed measurement circuit 9 is implemented by using a Hall sensor, which has high accuracy and is easy to implement, but is not limited thereto.

[0028] In this specific embodiment, the specific circuit connection relationship between the bus voltage measurement circuit 10, the current measurement circuit 8 and the motor speed measurement circuit 9 is shown in Figure 2 and 3 , this will not be elaborated. Of course, in other embodiments, the bus voltage measurement circuit 10, the current measurement circuit 8 and the motor speed measurement circuit 9 can also be implemented by other existing circuit forms. This can be easily implemented by those skilled in the art and will not be elaborated.

[0029] In this specific embodiment, the main control unit 6 is implemented by a single chip microcomputer U2 of model STM32F105RBT6. For details, see Figure 3 This will not be elaborated any more. Of course, in other embodiments, the main control unit 6 may also be implemented by other single chip microcomputers.

[0030] In this specific implementation, the motor drive circuit 4 is implemented by half-bridge drivers U8, U9 and U10 and power MOS tubes MOS1-MOS12. The model of the half-bridge drivers U8, U9 and U10 is IR2181S. The specific circuit connection relationship is detailed in Figure 2The motor drive circuit has high control accuracy, high real-time performance, and high reliability, but is not limited thereto. In other embodiments, the motor drive circuit 4 can also be implemented by other existing motor drive circuits, which can be easily implemented by those skilled in the art and will not be described in detail.

[0031] In this specific implementation, the first switch circuit 2 and the second switch circuit 3 both use power MOS tubes for switching on and off, and are controlled by the motor control board outputting PWM signals, which have high sensitivity and reliability. Figure 3 Of course, in other embodiments, the first switch circuit 2 and the second switch circuit 3 may also be implemented by other switch circuits.

[0032] In this specific embodiment, the power supply circuit 1 includes an AC / DC circuit, a voltage stabilizing circuit and a voltage step-down circuit. The input end of the AC / DC circuit is connected to an AC input (i.e., mains power), and the output end of the AC / DC circuit is connected to a DC input end of a motor drive circuit 4 through a first switch circuit 2. At the same time, the voltage stabilizing circuit and the voltage step-down circuit are used to power other electronic devices of the resistance generating device.

[0033] In this specific embodiment, the AC / DC circuit is implemented by an offline converter U4 of model VIPER26, which has high safety and reliability and low energy consumption. For details of the specific circuit, see Figure 3 Of course, in other embodiments, the AC / DC circuit can also be implemented by using other existing AC / DC circuits.

[0034] In this specific embodiment, the step-down circuit includes a 5V step-down circuit and a 3.3V step-down circuit, which are used to power various electronic devices of the resistance generating device. The specific circuits of the voltage stabilizing circuit and the step-down circuit are shown in Figure 3 , but it is not limited to this.

[0035] In this specific embodiment, a meter 11 is included, and the meter 11 is communicatively connected to the motor control board. Specifically, the meter 11 is communicatively connected to the main control unit 6, and can be connected through a universal wired interface, such as: UART, CAN, 485, etc. Of course, wireless communication connection, such as Bluetooth, WIFI, etc., can also be used.

[0036] The instrument 11 is provided with a display screen and buttons, and the user can select the exercise mode, resistance size, rotation speed, etc. through the instrument 11.

[0037] In this specific embodiment, the permanent magnet synchronous motor 5 is hub-shaped and is embedded in an annular counterweight block, namely, an inertia wheel, to provide resistance or power.

[0038] Working process:

[0039] Exercise mode: The user selects an exercise mode on the meter 11 and sets the resistance. The meter 11 converts it into a resistance control instruction and sends it to the motor control board; the motor control board controls the first switch circuit 2 to turn off, and according to the size of the resistance, uses the FOC constant torque closed-loop control algorithm to control the permanent magnet synchronous motor 5 to output the corresponding resistance through the motor drive circuit 4. The user turns the crank to drive the permanent magnet synchronous motor 5 and the inertia wheel to rotate through the transmission device to exercise; the permanent magnet synchronous motor 5 rotates under the set resistance to generate electrical energy. The motor control board controls the motor drive circuit 4 to convert the electrical energy into direct current, and controls the second switch circuit 3 to be turned on, so that the direct current is output to the power consumption unit 7 through the second switch circuit 3 and dissipated in the form of heat energy.

[0040] Recovery mode: The user selects the recovery mode on the instrument 11 and sets the speed. The instrument 11 converts it into a speed control instruction and sends it to the motor control board. The motor control board controls the first switch circuit 2 to be turned on and the second switch circuit 3 to be turned off. The power supply circuit 1 supplies power to the motor drive circuit 4 through the first switch circuit 2. The motor control board controls the motor drive circuit 4 to drive the permanent magnet synchronous motor 5 to rotate at the set speed according to the FOC constant speed closed-loop control algorithm based on the speed. The crank is driven to rotate through the transmission device, and the crank drives the foot locked on the pedal to make a circular motion, thereby achieving the purpose of motion recovery.

[0041] The present invention also provides a fitness vehicle, which is provided with the above-mentioned resistance generating device. The specific structure of the fitness vehicle of this specific embodiment is as follows: Figure 4 As shown, it also includes a crank 15, a pulley 13 and a belt 14. The crank 15 is connected to the rotating shaft of the pulley 13. The rotation of the crank 15 drives the pulley 13 to rotate. The pulley 13 is connected to the permanent magnet synchronous motor 5 through the belt 14. The rotation of the pulley 13 drives the permanent magnet synchronous motor 5 and the inertia wheel 12 to rotate through the belt 14, or the rotation of the permanent magnet synchronous motor 5 drives the pulley 13 to rotate through the belt 14, thereby driving the crank 15 to rotate.

[0042] The specific working process can refer to the above working process, which will not be elaborated here.

[0043] The resistance generating device of the present invention can provide resistance for exercise and power to help users recover from exercise. It has diverse functions and improves user experience. The same device is used to provide resistance and power, which effectively reduces the complexity of the structure and manufacturing cost of the fitness vehicle and provides more space for the design of the fitness vehicle.

[0044] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A resistance generating device, characterized in that: It comprises a power supply circuit, a first switch circuit, a second switch circuit, an electric energy consumption unit, a motor control board, a motor drive circuit and a permanent magnet synchronous motor, wherein the power supply circuit supplies power to the entire resistance generating device, an output end of the power supply circuit is connected to a DC input end of the motor drive circuit through the first switch circuit, an AC output end of the motor drive circuit is connected to an input end of the permanent magnet synchronous motor, a DC output end of the motor drive circuit is connected to the power consumption unit through the second switch circuit, the control ends of the first switch circuit, the second switch circuit and the motor drive circuit are respectively connected to a control output end of the motor control board, when in a power mode, the motor control board controls the first switch circuit to be turned on, the second switch circuit to be turned off, and controls the motor drive circuit to drive the permanent magnet synchronous motor to rotate accordingly; when in a resistance mode, the motor control board controls the second switch circuit to be turned on, the first switch circuit to be turned off, and controls the permanent magnet synchronous motor to output corresponding resistance through the motor drive circuit; The motor control board includes a main control unit, a bus voltage measurement circuit, a current measurement circuit and a motor speed measurement circuit, wherein the bus voltage measurement circuit is used to measure the voltage of the DC bus and output it to the main control unit, and the current measurement circuit and the motor speed measurement circuit are used to measure the phase current and the speed of the permanent magnet synchronous motor respectively and output them to the main control unit, and the main control unit performs corresponding FOC closed-loop control according to the voltage of the DC bus, the phase current and the speed of the permanent magnet synchronous motor; The power supply circuit includes an AC / DC circuit, a voltage stabilizing circuit and a voltage step-down circuit. The input end of the AC / DC circuit is connected to an AC input, and the output end of the AC / DC circuit is connected to a DC input end of a motor driving circuit through a first switch circuit. At the same time, the voltage stabilizing circuit and the voltage step-down circuit are used to power other electronic devices of the resistance generating device.

2. The resistance generating device according to claim 1, characterized in that: The electric energy consumption unit is a power resistor.

3. The resistance generating device according to claim 1, characterized in that: The motor driving circuit is implemented by using a half-bridge driver and a power MOS tube.

4. The resistance generating device according to claim 1, characterized in that: The first switch circuit and the second switch circuit both use power MOS tubes for switching on and off, and are controlled by PWM signals output by the motor control board.

5. The resistance generating device according to claim 1, characterized in that: Also included is a meter that is communicatively connected to the motor control board.

6. The resistance generating device according to claim 1, characterized in that: The permanent magnet synchronous motor is hub-shaped and is embedded in an annular counterweight.

7. A fitness bike, characterized in that: A resistance generating device as claimed in any one of claims 1 to 6 is provided.

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