A magneto-resistive energy-feeding ergometer

Abstract

A magneto-resistive energy-feeding ergometer is provided. The magneto-resistive generating device of the ergometer comprises a metal flywheel 10, a stator mechanism 12 and a servo driving mechanism(13

Description

A MAGNETO-RESISTIVE ENERGY-FEEDING ERGOMETER TECHNICAL FIELD

[0001] The present disclosure provides a magneto-resistive energy-feeding ergometer, which belongs to the technical field of sports training and health detection and testing. BACKGROUND ART

[0002] With the continuous development of society, people's life has become more and more fast-paced, and at the same time more and more people neglect their health due to their busy work, thus inducing a series of diseases including obesity, hypertension, diabetes, hyperlipidemia and so on. Therefore, strengthening people's physical activity and enhancing their physical fitness has become an urgent problem. As a characterization of the ability of the human body to sustain activity, cardiorespiratory endurance shows the level of people's cardiorespiratory endurance under a certain exercise intensity and is considered an important indicator to evaluate a person's physical fitness level. In the cardiorespiratory fitness test among the commonly used exercise methods are walking, running, ergometer, treadmill and steps. Among these several exercise methods, only ergometer has low learning effect, can accurately display the workload or output power and very safe without accidental falls. In the ergometer for the actual cardiorespiratory fitness evaluation, will set the exercise power in advance, requiring the testers to pedal at a fixed frequency for a specific time, and record the heart rate and oxygen uptake under each level of power. However, due to physical constraints, it is difficult to maintain a stable pedaling speed and thus cannot guarantee a constant power at all levels. In order to achieve constant power, the resistance must be adjusted in real time. At this stage, there are two kinds of adjustment of the resistance of ergometer, the first prior art is to adjust the resistance by motor controlling the distance between the magnet and metal flywheel by means of wire, although the number of segments of resistance adjustment is more refined, it is difficult to achieve precise constant power control, and does not have real- time performance; the second prior art is the way of current magnetic control adjustment, this way changes the magnetic resistance by changing the current or voltage of the energized coil winding. Although this way can compensate the power fluctuation generated by the pedal rate in real time and solve the problems of the first prior art to some extent, this way can realize the continuous adjustment of the resistance, but the instantaneous nature of the current adjustment will make the magnetic resistance adjustment response too sensitive and rapid, which will make the tester lack the process of resistance gradual change during use; and this way requires a large number of turns of the coil, when the current gradually increases, a large amount of heat will be generated, so the incoming current cannot be too large, thus, the adjustable power range can be adjusted by this way of current magnetron regulation in a very limited. SUMMARY

[0003] Purpose of the present disclosure: The present disclosure relates to a magneto- resistive energy-feeding ergometer, the purpose of which is to solve the problem that the testers lack the experience process of resistance gradual due to the lack of resistance gradient process when using the ergometer of the previous current magneto-controlled adjustment method in the past, and the problem that a large amount of heat is generated when the current is gradually increased, so that its adjustable power range is limited.

[0004] In accordance with the invention there is provided a magneto-resistive energy- feeding ergometer, the ergometer includes an armrest, a frame, a driving wheel, a seat, a magneto-resistive generating device and an upper computer, the seat is provided in the middle of the frame, the driving wheel is provided under the seat, and the magneto- resistive generating device is provided in front or behind the driving wheel, the driving wheel is configured to drive the magneto-resistive generating device, the magneto- resistive generating device is connected to the upper computer in a manner of data transmission, the upper computer is provided on the frame, and a front end of the frame is provided with the armrest, said magneto-resistive generating device includes a metal flywheel, a stator mechanism and a servo drive mechanism, the metal flywheel is arranged coaxially with the stator mechanism are set coaxially, and an air gap is provided between the metal flywheel and the stator mechanism, the metal flywheel is connected with the drive wheel through a chain or a belt, the metal flywheel is connected to the frame through a central shaft, a bottom of the stator mechanism is slidably connected to the frame through slidable connector, and the slidable connector is connected with the servo drive mechanism, and the servo drive mechanism is connected with the upper computer; a speed sensor is provided on the drive wheel, a detection sensor is provided on the load connected to the stator mechanism, and both the speed sensor and the detection sensor are connected with the upper computer.

[0005] Preferebly, said metal flywheel has a disc-shaped structure with a plurality of permanent magnets arranged on the outer edge of the outer circumference of the disc, and a center of the disc is connected with the central shaft via a bearing; the stator mechanism includes a coil winding, a silicon steel sheet and a stator connecting plate, and a bottom end of the stator connecting plate is fixed on a slidable connector, and a gap is provided between a center of the stator connecting plate and the central shaft, and the silicon steel sheet with an annular shape is fixed at an upper end of the stator connecting plate, and a plurality of coil windings are fixed on the inner circumference of the silicon steel sheet, the coil windings are connected to a load, the load is connected to the detection sensor, the detection sensor is connected with the upper computer, the metal flywheel is able to be embedded in the space enclosed by the coil windings, and an air gap is provided between the silicon steel sheet and the permanent magnets on the metal flywheel.

[0006] Preferably, the coil winding is wound with a fractional slot, and the coil winding is separated from the silicon steel sheet by an insulating material.

[0007] Preferably, the slidable connector includes a linear slide rail, a slide rail slot, a ball screw and a nut holder, the linear slide rail is fixed to the frame, the length direction of the linear slide rail is parallel to the central shaft, the linear slide rail is matched with the slide rail slot, the slide rail slot and the nut holder are fixed to the bottom of the stator connection plate, the nut holder is threadedly connected with the ball screw, and the ball screw is connected to the servo drive mechanism.

[0008] Preferably the movement range of the stator mechanism is within 31 mm.

[0009] Preferably, a plurality of positioning slots are provided between a plurality of permanent magnets provided on the outer edge of said metal flywheel, and pressing blocks are fixed in the positioning slots.

[0010] Preferably, said positioning slots are dovetail slots, and the permanent magnets are attached to the surface of the outer edge of the metal flywheel and the permanent magnets are disconnected at positions corresponding to the dovetail slots, forming oblique sections at the disconnection positions; each of the pressing blocks is provided with dovetail blocks at both ends, and a dove tail block at one end of the each of the pressing blocks extends into one of the positioning slots, and side faces of a dove tail block at the other end of the each of the pressing blocks presses against the oblique sections of one of the permanent magnets on both sides.

[0011] Preferably, the coil winding is connected to the load and is also connected to a battery.

[0012] Advantageous effect. When the present disclosure is used, the adjustment of the effective axial length of the air gap is mainly realized by adjusting the distance in the axial direction between the metal flywheel and the stator mechanism, while the adjustment of the distance in the axial direction between the metal flywheel and the stator mechanism is achieved by driving the AC servo motor, where the displacement of the stator mechanism is realized by changing the pulse signal of the AC servo motor, and the direction of the stator mechanism movement is realized by changing the forward and reverse rotation of servo motor, and the AC servo motor is relatively stable during operation without low-speed vibration. Therefore, the resistance can be adjusted in real time and continuously, and there is no problem that the instantaneous nature of the current adjustment will make the reluctance adjustment too sensitive and rapid in the direct current adjustment mode, so it can also effectively solve the problem that the resistance cannot be gradually changed in the current magnetic control adjustment, and because there is no need to adjust the current directly, there is no problem that the resistance can be gradually changed when the current increases. So that the adjustable range of its power is larger than the range of current magnetron regulation.

[0013] In addition, in the present disclosure, during the rotation of the metal flywheel, while the electrical energy generated by the coil winding is output to the load, part of it can be stored in the battery, and part of it can be supplied to the control system of the ergometer to realize the recycling of electrical energy.

[0014] In summary, the structure is scientific and reasonable, which is conducive to fitness enthusiasts for cardiopulmonary endurance assessment and training, and also conducive to the promotion and application in rehabilitation treatment and rehabilitation training. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG. 1 is an overall schematic view of the present disclosure;

[0016] FIG. 2 is a side view of FIG. 1;

[0017] FIG. 3 is a top view of FIG. 1;

[0018] FIG. 4 is a schematic diagram of the structure of the magneto-resistive generating device described in the present disclosure;

[0019]

[0020] FIG. 8 is a schematic diagram of the central shaft; FIG. 9 is a assembly schematic diagram of the metal flywheel and the central

[0024] FIG. 10 is a partial schematic diagram of FIG. 8;

[0025] FIG. 11 is a schematic diagram of the stator mechanism for winding coils;

[0026] FIG. 12 is a schematic diagram of the servo drive mechanism cooperated with the stator connecting plate;

[0027] FIG. 13 is a diagram of the output power obtained after changing the effective axial length of the air gap;

[0028] FIG. 14 is a diagram of the electromagnetic torque obtained after changing the effective axial length of the air gap;

[0029] FIG. 15 is an expanded view of the coil winding;

[0030] FIG. 16 is a diagram of the magnetic force line trend;

[0031] FIG. 17s a block diagram of the overall system of the magneto-resistive energy- feeding ergometer; and

[0032] FIG. 18 shows the schematic of control principle.

[0033] The figures are labeled: 1, upper computer, 2, armrest; 3, frame; 4, drive wheel; 5, chain or belt; 6, seat; 7, magneto-resistive generating device; 8, bottom plate; 9, central shaft; 10, metal flywheel; 10-1, positioning slot; 11, central shaft fixed frame; 12, stator mechanism; 13, servo drive mechanism; 13-1, servo motor; 14, linear slide rail; 15, slide rail slot; 16, pressing block; 16-1, dovetail block; 16-1-1, side face; 17, permanent magnet; 17-1, oblique section; 18, shaft shoulder; 19, limit slot; 20, coil winding; 21, annular silicon steel sheet; 21-1, stator tooth part; 21-2, stator yoke part; 22, stator connecting plate; 23, nut holder; 24, elastic retaining ring; 25, shaft sleeve; 25-1, driven wheel; 26, gap; 27, one-way bearing; 28, ball screw. DETAILED DESCRIPTION OFTHE EMBODIMENTS

[0034] The present disclosure is further described below in connection with the accompanying drawings.

[0035] Embodiment]. As shown in FIGS. 1-3, a magneto-resistive energy-feeding ergometer, the ergometer includes an armrest 2, a frame 3, a drive wheel 4, a seat 6, a magneto-resistive generating device 7 and an upper computer 1, the seat 6 is set in the middle of the frame 3, the drive wheel 4 is provided under the seat 6, a magneto-resistive generating device 7 is provided in front of or behind the drive wheel 4, the drive wheel 4 is configured to drive the magneto-resistive generating device 7, and the magneto-resistive generating device 7 is connected to the upper computer 1in a manner of data transmission. The upper computer 1 is provided on the frame 3, and a front end of the frame 3 is provided with the armrest 2; a speed sensor is provided on the beam inside the driving wheel 4, and the speed sensor is connected with the upper computer 1, and the speed of the metal flywheel 10 can be obtained indirectly through the speed sensor. The dimensions between the parts of this device are designed in accordance with ergonomic requirements, and the seat, etc. is an existing structure that can be adjusted in a limited range (e.g., to do height adjustment) to meet the requirements of testers of different heights and body types.

[0036] The magneto-resistive generating device 7 includes a metal flywheel 10, a stator mechanism 12 and a servo drive mechanism 13; the metal flywheel 10 is arranged coaxially with the stator mechanism 12, an air gap 26 is provided between the metal flywheel 10 and the stator mechanism 12, the metal flywheel 10 is connected with the drive wheel 4 through a chain or belt 5, and the metal flywheel 10 is axially connected to the fixed central shaft fixing frame 11 on the frame 3 by a central shaft 9. The central shaft fixing frame 11 is composed of left and right support plates. The bottoms of the left and right support plates are fixedly connected with the base 8, the base 8 is fixed on the frame 3, and the upper parts of the left and right support plates are provided with positioning holes for the installation of the central shaft 9, as shown in FIGS. 4 and 5.

[0037] The central shaft 9 is provided on the fixed frame 11, and the central shaft 9 is fixed, and the central shaft 9 passes through the axis of the metal flywheel 10 and the stator mechanism 12, i.e., the metal flywheel 10 and the stator mechanism 12 with the winding coil are always coaxial (or concentric), and a shaft sleeve 25 capable of rotating on the axis of the central shaft 9 is provided between the metal flywheel 10 and the central shaft 9, and the metal flywheel 10 can be rotate under the driving of the shaft sleeve 25. The sleeve 25 is connected to the driving wheel 4 through a chain or belt 5 to realize linkage, i.e., as shown in FIGS. 9 and 10, and the end of the shaft sleeve 25 is provided with a driven wheel 25-1, and the driving wheel 4 drives the driven wheel 25-1 to rotate through the chain or belt 5 to drive the metal flywheel 10 to rotate when in use.

[0038] It should be noted here that when both the driving wheel 4 and the driven wheel 25-1 are sprockets, the driving wheel 4 is connected to the driven wheel 25-1 through a chain, and when both the driving wheel 4 and the driven wheel 25-1 are pulleys, the driving wheel 4 is connected to the driven wheel 25-1 through a belt, but of course, the same principle as the above-mentioned way can be used, which is not repeated here.

[0039] The metal flywheel 10 is fixed axially with the central shaft 9, i.e., the metal flywheel 10 cannot move axially along the rear central shaft 9 of the ergometer; there is a gap between the stator mechanism 12 at the center hole and the central shaft 9, and the stator mechanism 12 can move axially along the central shaft 9; the bottom of the stator mechanism 12 is slidably connected to the fixed bottom plate 8 on the frame 3 through a slidable connector, and the slidable connector is connected to the servo drive mechanism 13, which is connected to the upper machine 1.

[0040] Further, as shown in FIGS. 8, 9 and 10, the central shaft 9 is provided with a limit slot 19, and the end of the central shaft 9 is also provided with an shaft shoulder 18, through which a solid connection is realized with the positioning holes of the left and right side support plates in the central shaft fixing frame 11. The axial fixation of the metal flywheel 10 on the central shaft 9 is achieved through the use of the limit slot 19 and the elastic retaining ring 24 of the shaft sleeve 25.

[0041] As shown in FIGS. 4-6, said metal flywheel 10 is a disc-shaped structure, and a plurality of permanent magnets 17 are provided on the outer edge of the outer circumference of the disc, and the permanent magnets 17 are bonded to the metal flywheel 10 using a special glue. Sticking permanent magnets generally use the following glue: acrylic AB glue, anaerobic glue, epoxy glue, etc. The effective fixation of the permanent magnets can be achieved.

[0042] As shown in FIGS. 9 and 10, the center of the disk of the metal flywheel 10 is bearingly connected to the central shaft 9 through the shaft sleeve 25. Further, as a preference, the metal flywheel 10 and the shaft sleeve 25 can be connected by a one-way bearing 27, using its one-way rotation characteristics to drive the metal flywheel 10 to rotate together, for example: three one-way bearings 27can be used directly, the shaft hole inside the metal flywheel 10 is 31mm deep, a one-way bearing 27 is about 11 or 12mm deep, installing three one-way bearings can ensure the stability of the assembly; Or the metal flywheel 10 and the shaft sleeve 25 are connected through a one-way bearing 27 and deep groove ball bearing, at this time, a one-way bearing plays a main role, using its one-way rotation characteristics drive the metal flywheel 10 to rotate together, and the deep groove ball bearing plays a secondary role, that is, through the shaft sleeve 25 and a one-way bearing 27 drive the metal flywheel 10 rotation, for example: a one-way bearing plus two deep groove ball bearings can be used. As mentioned before, the shaft hole inside the metal flywheel 10 is 31mm deep, a one-way bearing about 11 or 12mm deep, then two deep groove ball bearings can be used together with a one-way bearing to ensure the stability of the assembly, compared with the aforementioned method of using multiple one-way bearings, the cost is lower.

[0043] As shown in FIGS. 6 and 7, a plurality of positioning slots 10-1 are provided between a plurality of permanent magnets 17 provided on the outer edge of the metal flywheel 10, and the positioning slots 10-1 are fitted with a pressing block 16. The assembly method is that the permanent magnets 17 are attached to the surface of the outer edge of the metal flywheel 10 and are pressed by the pressing block 16.

[0044] Further, as shown in FIG. 7, said positioning slots 10-1 are dove tail slots, and the permanent magnets 17 are attached to the surface of the outer edge of the metal flywheel 10 and the permanent magnets 17 are disconnected at the position corresponding to the dovetail slots 10-1, forming oblique sections 17-1 at the disconnection positions; one of the pressing block 16 is provided with dovetail blocks 16-1 (or trapezoidal blocks) at both ends, and the dovetail block 16-1 at one end of the pressing block 16 extends into the positioning slot 10-1, and the side face 16-1-1 of the dovetail block at the other end of the pressing block 16 presses against the oblique section 17-1 of the permanent magnet 17 on both sides.

[0045] As shown in FIG. 11, the stator mechanism 12 includes a coil winding 20, a silicon steel sheet 21 and a stator connection plate 22, the bottom end of the stator connection plate 22 is fixed to the slidable connector, the upper end of the stator connection plate 22 is fixed to a ring-shaped silicon steel sheet 21, as shown in FIG. 16, the stator tooth part 21-1 and the stator yoke part 21-2 form the silicon steel sheet 21, a plurality of coil windings 20 are fixed on the stator tooth portion 21-1 of the inner circumference of the silicon steel sheet 21. The coil winding 20 is connected to the load, and the detection sensor used to detect the voltage on both sides of the load or the current flowing through the load is connected to the upper computer 1 in manner of data transmission. The metal flywheel 10 can be embedded in the space enclosed by the coil winding 20, and there is an air gap 26 between the stator tooth portion 21-1 of the silicon steel sheet 21 and the permanent magnet 17 on the metal flywheel 10. When the metal flywheel 10 is in close to the stator mechanism, the metal flywheel 10 is a structure that can be embedded in the space enclosed by the coil 20, see Figures 4 and 5.

[0046] The coil winding 20 is wound with fractional slots, and the coil winding 20 is separated from the stator tooth portion 21-1 of the silicon steel sheet 21 by insulating material. The silicon steel sheet iron core 21 can be attached to the stator connecting plate 22 (by screws, etc.). The stator connecting plate is welded by three connecting pieces and has sufficient stiffness.

[0047] When the metal flywheel 10 rotates, a rotating magnetic field is formed, the coil winding 20 cuts the magnetic field line in the rotating magnetic field or the magnetic poles generated by the permanent magnet 17 cuts the coil winding during rotation, and the coil winding 20 is connected to the load through a rectifier circuit, where the load is used as a resistor with a resistance value must meet the requirement that if the output voltage of the coil winding side without burning the resistor if it is too large, for example, set to 500 ohms, etc. as required; the detection sensor for detecting the voltage on both sides of the load or the current flowing through the load is connected to the upper computer 1 in a manner of data transmission.

[0048] As shown in FIGS. 4-5 and 12, the slidable connector includes a linear slide rail 14, a slide rail slot 15, a ball screw 28 and a nut holder 23, the linear slide rail 14 is fixed to a fixed bottom plate 8 on the frame3, the length direction of the linear slide rail14 is parallel to the central shaft9, the linear slide rail14 is matched with the slide rail slot 15, the slide rail slot 15 and the nut holder 23 are fixed to the bottom of the stator connection plate 22. The nut holder 23 is threadedly connected with the ball screw 28, and the ball screw 28 is threadedly matched with the threaded hole of the nut holder 23 to form a ball screw nut pair, and the ball screw 28 is connected to the servo drive mechanism 13. The stator mechanism 12 is provided on the linear slide rail14 by the stator connection plate 22 and the stator mechanism 12 can move along the linear slide rail 14.

[0049] As shown in FIGS. 5 and 12, the servo drive mechanism 13 includes a servo motor 13-1 signally connected to the upper computer 1, and the servo motor 13-1 is connected to the ball screw 28, and the axial direction of the ball screw 28 is parallel to the central shaft9; when the ball screw pair is used, the motion efficiency is relatively high, and the driving torque is 1 / 3 of the sliding screw pair compared with the traditional sliding screw pair; using the ball screw pair can ensure high precision and can realize micro-feeding. The ball screw is selected because the effective axial length of the air gap of the device is 0-3 1mm, and the required precision is high and the feed is small; the stator mechanism 12 is provided on the linear slide rail 14 through the stator connecting plate 22 and the stator mechanism 12 can move along the linear slide rail 14, the length direction of the linear slide rail14 is parallel to the central shaft9, and the bottom of the stator connecting plate 22 is provided with a threaded hole. The bottom of the stator attachment plate 22 is provided with a nut holder 23 with a threaded hole, and the ball screw 28 is threadedly matched with the threaded hole of the nut holder 23 to form a ball screw nut pair.

[0050] The upper computer 1 is a control system connected with a display screen, and the upper computer 1 is placed on the frame 3 in the middle part of the ergometerarmrest2. The upper computer 1 is charged by a battery, and the speed sensor is provided at the inner beam of the drive wheel 4. When the drive wheel 4 is rotating, the speed sensor will detect the rotational speed, and then the rotation speed information of the metal flywheel 10 will be transmitted to the upper computer 1 via Bluetooth technology. Where the display screen of the upper computer 1 can show the output power (according to P=P,+P,+P3, where P is the power of the battery, Pz is the power consumed by the components in the control system, P3 is the power consumed by the load; where R is the resistance value of the variable load and U is the voltage of the variable load) and the pedaling rate.

[0051] Embodiment2: In this embodiment, on the basis of Embodiment 1, the coil winding 20 is connected to the load through the rectifier circuit and can also be connected to the battery, etc., for electrical energy recovery; where the battery can supply power to the electrical components, such as the upper computer 1, and the battery is connected to the upper computer 1. That is, when the magnetic resistance generating device 7 is working, that is, when a person is pedaling the pulley of the ergometer, during the rotation of the belt, the belt drive will drive the metal flywheel 10 rotation, because the permanent magnet 17 is attached to surface of the metal flywheel 10, it will form a rotating magnetic field, the stator mechanism 12 winding coil winding will cut magnetic field line (or the magnetic poles generated by the permanent magnet cut the coil conductor in the stator slot during the rotation), on the one hand, magnetic resistance is generated to provide exercise load for the tester, on the other hand, three-phase alternating current I generated in the coil winding 20, and after the rectification circuit, part of the electrical energy will be stored in the battery, and the other part of the electrical energy will be provided to the upper computer 1 (the load, battery, upper computer 1, etc. can be set in parallel).

[0052] Method of application

[0053] As shown in FIG. 17, when using, firstly, the upper computer 1 will set a target power command information for the magneto-resistive energy-feeding ergometer, and the constant power upper computer 1 of the magneto-resistive energy-feeding ergometer will receive this command information, and will adjust the effective axial length of the air gap of the magneto-resistive generating device 7 by driving the stator mechanism 12 through the servo motor 13-1 in accordance with this command information during use. The user sits on the seat 6 and holds the armrest 2 and then starts to pedal the drive wheel 4 to make it rotate and drive the metal flywheel 10 to rotate, as the surface of the metal flywheel 10 is attached with the permanent magnet 17, a rotating magnetic field will be formed and the coil winding 20 will cut magnetic field line in the magnetic field (or the magnetic pole generated by the permanent magnet will cut the coil conductor in the stator slot during the rotation process) to provide magnetic resistance for the ergometer, and in this process the actual output power of the coil winding 20 is detected and fed back to the upper computer 1 through detection devices such as sensors (speed sensor and detection sensor), the output power is transformed to the load, which is reflected by the power output by load, that is, through the detection sensor to detect the voltage or current on both sides of the load, according to the formula to derive the output power, if the detection is voltage then the formula is: P= U2 / R, where P is the required detected output power, U is the output voltage of the coil winding 20 that is, the voltage on both sides of the load, Ris the load resistance; if the detection is current, the formula is: P = 12 / R, where P is the required detected output power, I is the output current of the coil winding that is, the current flowing through the load, R is the load resistance.

[0054] The upper computer 1 compares the feedback output power information with the target power command information to get the error value between the two, and then the upper computer 1 controls the actuator to continuously reduce the error according to the obtained error value, and the specific way to control the actuator to continuously reduce the error is to adjust the effective axial length of the air gap, that is, to adjust the axial distance between the stator mechanism 12 and the metal flywheel 10, and the effective axial length of the air gap mainly depends on driving the AC servo, where the displacement of the stator mechanism 12 movement is achieved by changing the pulse signal of the AC servo motor 13-1, and the moving direction of the stator mechanism 12 is achieved by changing the forward and reverse rotation of the servo motor 13-1, when the tester is testing, if the tester needs to be loaded with a load, the control system of the ergometer will drive the servo motor to rotate, through the screw nut mechanism, the stator mechanism 12 wound with the coil winding 20 is driven to move linearly along the axial direction of the central shaft 9, and then realize the adjustment of the resistance of the ergometer. When the distance between the metal flywheel 10 and the stator mechanism 12 is increased, the effective axial length of the air gap becomes smaller and the resistance will become smaller, and vice versa, when the distance between metal flywheel 10 and the stator mechanism 12 is shortened, the effective axial length of the air gap becomes larger and the resistance will become larger. The schematic diagram of the control system is shown in the attached Fig. 18. If the user pedals slowly, the servo motor 13-1 needs to be rotated to adjust the stator mechanism 12 to move toward the metal flywheel 10, making the effective axial length of the air gap becomes larger, and vice versa, the servo motor rotates in the opposite direction to adjust the stator mechanism 12 to move away from the metal flywheel 10, making the effective axial length of the air gap becomes smaller; and if the said error exists all the time then the above-mentioned process of adjusting the effective axial length of the air gap is continuously executed until the error disappears, and finally the approximately coincident of the target power and the actual output power is achieved.

[0055] The adjustment method of the effective axial length of the air gap of the present disclosure can realize the resistance in real time and continuously adjustable, and the adjustable range of power is larger than the range of the previous current magnetic control adjustment; furthermore, the AC servo motor is smoother in operation and no low-speed vibration occurs, so it can effectively solve the problem that the resistance gradient cannot be realized in the current magnetic regulation.

[0056] In practical application, the upper computer 1 can be executed according to the requirements of the cardiorespiratory endurance assessment training program (i.e., the ergometer secondary quantitative load program). In the ergometer secondary quantitative load test, there are four phases, i.e., warm-up phase, first level load phase, second level load phase, and recovery phase, and the power required in each phase is constant power. The warm-up phase lasted for 1 minute to enable the subjects to become familiar with the exercise mode of the ergometer, and the load phase was the core of the whole test program. The main purpose is to test the subject's cardiopulmonary function under exercise stress conditions, and it is hoped that the subject will reach a steady state as soon as possible during the loading phase. Keeping the load in each phase at 3 minutes gives the subject sufficient time to reach stability during that phase. The recovery phase is necessary after intense exercise and helps the body to slowly transition from a state of high metabolic levels to a basal state, which helps to reduce the risk of exercise. Duration: 1 minute. During the test, the tester is generally required to maintain a riding speed of 60r / min throughout the pedaling process, but this speed will inevitably fluctuate, which requires adjustment of the effective axial length of the air gap. The specific content of the secondary quantitative load of the ergometer is shown in Table 1, according to the requirements of the exercise load in Table 1 to control the effective axial length of the air gap between the metal flywheel with permanent magnet attached and the coil winding of the stator mechanism in the reluctance generating device (when the output power is given, the servo motor in the reluctance generator is controlled to rotate, and then the axial cross distance between the stator mechanism winding the coil winding and the metal flywheel diameter of 210 mm, and a stator core with an outer diameter of 327 mm. The simulation by Ansoft-maxwell software shows that at a speed of 600 r / min (in the cardiorespiratory endurance test, the human pedaling rate is required to be 60 r / min). Under the condition of the structural size constraints, the output power of the magneto-resistive energy- feeding ergometer can be 300W.

[0060] In the coil winding 20 of the present disclosure, the expansion diagram of the coil winding 20 is shown in Fig. 15; the magnetic lines of force are shown in Fig. 16, i.e., the magnetic lines of force emitted from the permanent magnet pass through the air gap 26, the stator tooth part21-1, the stator yoke part 21-2, and then return to the stator tooth part21-1, then after passing through the air gap 26, and then return to the inside of the permanent magnet to form a magnetic flux circuit.

[0061] The stator mechanism 12 moves along the central shaft9 with an amplitude of no more than 31 mm, and it is known by simulation in Ansoft-maxwell software that the corresponding output power is 300 W when the effective axial length of the air gap axial is 31mm, which is already able to reach the limit value of the cardiorespiratory endurance test.

[0062] Fig. 13 and Fig. 14 show the electromagnetic torque and output power obtained after changing the effective axial length of the air gap. The data of the magneto-resistive energy-feeding ergometer of the present disclosure are obtained by Ansoft software simulation, and it can be seen from Fig. 13 and Fig. 14 that the electromagnetic torque can be achieved to vary from 0 Nm to 4.775 Nm and the output power can be achieved to vary from 0-275 W in the range of 0-30 mm of the effective axial length of the air gap, which can meet the requirements for the use of the ergometer.

[0063] It is to be noted that the above embodiments are exemplary and are not to be construed as a limitation of the present disclosure.

[0064] In summary, the present disclosure is scientifically and reasonably structured, and facilitates the assessment and training of cardiopulmonary function under constant power condition for testers. It can also be promoted and applied in rehabilitation treatment and training.

Claims

WHAT IS CLAIMED IS:

1. A magneto-resistive energy-feeding ergometer, the ergometer comprises a armrest (2), a frame (3), a driving wheel (4), a seat (6), a magneto-resistive generating device (7) and an upper computer (1), the seat (6) is provided in the middle of the frame (3), the driving wheel (4) is provided under the seat (6), and the magneto-resistive generating device (7) is provided in front of or behind the driving wheel (4), the drive wheel (4) is configured to drive the magneto-resistive generating device (7), the magneto-resistive generating device (7) is connected to the upper computer (1)in a manner of data transmission, the upper computer (1) is provided on the frame (3), and a front end of the frame (3) is provided with the armrest (2), wherein: the magneto-resistive generating device (7) comprises a metal flywheel (10), a stator mechanism (12) and a servo drive mechanism (13), the metal flywheel (10) is arranged coaxially with the stator mechanism (12), and an air gap (26) is provided between the metal flywheel (10) and the stator mechanism (12), the metal flywheel (10) is connected with the drive wheel (4) through a chain or belt (5), the metal flywheel (10) is connected to the frame (3) through a central shaft (9), a bottom of the stator mechanism (12) is slidably connected to the frame (3) through a slidable connector, and the slidable connector is connected with the servo drive mechanism (13), and the servo drive mechanism (13) is connected with the upper computer (1); a speed sensor is provided on the drive wheel (4), and a detection sensor is provided on the load connected to the stator mechanism (12), and both the speed sensor and the detection sensor are connected with the upper computer (1).

2. The magneto-resistive energy-feeding ergometer according to claim 1, wherein, the metal flywheel (10) has a disc-shaped structure with a plurality of permanent magnets (17) arranged on the outer edge of the outer circumference of the disc, and a center of the disc is connected with the central shaft (9)via a bearing; the stator mechanism (12) comprises coil windings (20), a silicon steel sheet (21) and a stator connecting plate (22), a bottom end of the stator connecting plate (22) is fixed on the slidable connector, a gap is provided between a center of the stator connecting plate (22) and the central shaft (9), the silicon steel sheet (21) with an annular shape is fixed at an upper end of the stator connecting plate (22), a plurality of coil windings (20) are fixed on the inner circumference of the silicon steel sheet (21), the coil windings (20) are connected to a load, the load is connected with the detection sensor, the detection sensor is connected with the upper computer (1), the metal flywheel (10) is able to be embedded in a space enclosed by the coil windings (20), and an air gap (26) is provided between the silicon steel sheet (21) and the permanent magnets (17) on the metal flywheel (10).

3. The magneto-resistive energy-feeding ergometer according to claim 2, wherein, the coil winding (20) is wound with a fractional slot, and the coil winding (20) is separated from the silicon steel sheet (21) by an insulating material.

4. The magneto-resistive energy-feeding ergometer according to claim 2 or 3, wherein, the slidable connector comprises a linear slide rail (14), a slide rail slot (15), a ball screw (28) and a nut holder (23-1), the linear slide rail (14) is fixed to the frame (3), the length direction of linear slide rail (14) is parallel to the central shaft (9), the linear slide rail (14) is matched with the slide rail slot (15), and the slide rail slot (15) and the nut holder (23-1) are fixed to the bottom of the stator connecting plate (22), and the nut holder (23-1) is threadedly connected with the ball screw (28), and the ball screw (28) is connected to the servo drive mechanism (13). 5S. The magneto-resistive energy-feeding ergometer according to and of claims 2 to 4, wherein, the movement range of the stator mechanism (12) is within 31 mm.

6. The magneto-resistive energy-feeding ergometer according to any preceding claim, wherein, a plurality of positioning slots (10-1) are provided between a plurality of permanent magnets (17) provided on an outer edge of the metal flywheel (10), and pressing blocks (16) are fixed in the positioning slots (10-1).

7. The magneto-resistive energy-feeding ergometer according to claim 6, wherein, the positioning slots (10-1) are dovetail slots, the permanent magnets (17) are attached to the surface of the outer edge of the metal flywheel (10) and the permanent magnets (17) are disconnected at positions corresponding to the dovetail slots (10-1), forming oblique sections (17-1) at the disconnection positions; each of the pressing blocks (16) is provided with dovetail blocks (16-1) at both ends, and a dove tail block (16-1) at one end of the each of the pressing blocks (16) extends into one of the positioning slots (10-1), and side faces of a dove tail block (16-1-1) at another end of the each of the pressing blocks (16) presses against the oblique sections (17-1) of each of the permanent magnets (17) on both sides.

8. The magneto-resistive energy-feeding ergometer according to claim 2, or any of claims 3 to 7 when dependent upon claim 2, wherein, the coil winding (20) is connected to both the load and a battery.

Images