CN115738163B - Magnetic control resistance system and resistance control method for fitness equipment - Google Patents
Magnetic control resistance system and resistance control method for fitness equipment Download PDFInfo
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- CN115738163B CN115738163B CN202211010576.7A CN202211010576A CN115738163B CN 115738163 B CN115738163 B CN 115738163B CN 202211010576 A CN202211010576 A CN 202211010576A CN 115738163 B CN115738163 B CN 115738163B
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims description 12
- 230000008859 change Effects 0.000 claims abstract description 11
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 229910001018 Cast iron Inorganic materials 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 230000035699 permeability Effects 0.000 claims description 3
- 230000005284 excitation Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 230000001276 controlling effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000002596 correlated effect Effects 0.000 description 3
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Abstract
The invention provides a magnetic control resistance system for fitness equipment, which comprises: the device comprises a human-computer interface, a main controller, a rotating speed sensor, a program-controlled constant current source, an electromagnet and a magnetic control flywheel; the human-computer interface is used for setting a resistance control mode and inputting control mode parameters into the main controller; the rotating speed sensor is used for collecting the rotating speed of the magnetic control flywheel and transmitting the rotating speed parameter to the main controller; the main controller is used for calculating and generating control parameters according to the control mode parameters and the rotating speed parameters of the magnetic control flywheel, and transmitting the control parameters to the program-controlled constant current source; the program-controlled constant current source is electrically connected with the electromagnet and is used for controlling the exciting current of the electromagnet to change according to the control parameters calculated by the main controller so as to further control the magnetic field intensity of the electromagnet; the electromagnet is magnetically attracted with the magnetic control flywheel and is used for controlling the resistance of the magnetic control flywheel. The invention not only has the advantages of noise, smooth resistance and small volume of the magnetic resistance, but also can lead the magnetic control flywheel to provide magnetic control fluid resistance which is close to the resistance of rowing in water.
Description
Technical Field
The invention relates to the technical field of fitness equipment, in particular to a magnetic control resistance system and a resistance control method for the fitness equipment.
Background
Along with the improvement of living standard, the health consciousness of people is gradually improved, and more indoor body-building exercise equipment is widely applied, so that people can engage in multiple exercises indoors, and the effect of body exercise is achieved.
In the on-road racing boat products (such as rowing machine) of the fitness equipment, the resistance source part of the fitness equipment is a core part for providing the resistance of the equipment and is mainly divided into three resistance modes of wind resistance, water resistance, magnetic resistance and the like. The wind resistance is generated by rotating the fan blades, the resistance is changed by adjusting the size of the air inlet, the resistance effect is close to the actual rowing effect, the resistance is smooth, the maintenance is convenient, but the noise is large and the volume is large. The water resistance is generated by rotating the blades in water, the resistance is changed by changing the water quantity and the angle of the blades, the resistance is close to the real resistance of rowing, but the maintenance is troublesome, the resistance is poor in linearity and the water tank is large in size under the influence of water gravity. The magnetic resistance is that the resistance is generated by Lorentz force acted by induced current generated by the metal flywheel in the magnetic field, the resistance is changed by changing the distance between the magnet and the flywheel, the noise is quiet, the resistance is smooth, the volume is small, but the difference between the resistance and the fluid resistance is larger.
Disclosure of Invention
The invention aims to solve the technical problems that: the magnetic control resistance system for the fitness equipment overcomes the defects of the prior art, is small in size, can accurately simulate the fluid resistance, and achieves the effect of approaching the water rowing resistance.
The technical proposal of the invention is to provide a magnetic control resistance system for fitness equipment, which has the following structure:
the device comprises a human-computer interface, a main controller, a rotating speed sensor, a program-controlled constant current source, an electromagnet and a magnetic control flywheel;
the human-computer interface is used for setting a resistance control mode and inputting control mode parameters into the main controller; the rotating speed sensor is used for collecting the rotating speed of the magnetic control flywheel and transmitting rotating speed parameters to the main controller; the main controller is used for calculating and generating control parameters according to the control mode parameters and the rotating speed parameters of the magnetic control flywheel, and transmitting the control parameters to the program-controlled constant current source; the program-controlled constant current source is electrically connected with the electromagnet and is used for controlling the exciting current of the electromagnet to change according to the control parameters calculated by the main controller so as to control the magnetic field intensity of the electromagnet; the electromagnet is magnetically attracted with the magnetic control flywheel and is used for controlling the resistance of the magnetic control flywheel.
Preferably, the magnetic control flywheel comprises a cast iron flywheel, and a conductive layer is arranged on the surface of the cast iron flywheel.
Preferably, the conductive layer is a conductive layer made of copper or aluminum. The cast iron flywheel provides inertia and plays a role of a magnetizer to form a magnetic field as shown in fig. 2; the aluminum plate or the copper plate of the conductive layer can generate magnetic control resistance by the rotation of the cast iron flywheel and the cutting magnetic field.
After the structure is adopted, compared with the prior art, the magnetic control resistance system for the body-building equipment has the following advantages:
after the human-computer interface is provided with a resistance mode, the rotating speed sensor can acquire the rotating speed of the magnetic control flywheel in real time and transmit the rotating speed parameter into the main controller, the main controller can calculate and generate the control parameter according to the control mode parameter and the rotating speed parameter of the magnetic control flywheel, and the exciting current of the electromagnet is accurately controlled by the program-controlled constant current source to change according to the set control mode, so that the magnetic control flywheel provides magnetic control fluid resistance close to the underwater rowing resistance, and meanwhile, the magnetic control resistance system also has the advantages of silence, smooth resistance and small volume of magnetic resistance.
The invention also provides a resistance control method of the magnetic control resistance system, which comprises the following steps:
s1, setting a required resistance control mode on a man-machine interface, and inputting control mode parameters into a main controller;
s2, a rotating speed sensor collects the rotating speed of the magnetic control flywheel and transmits rotating speed parameters to a main controller;
s3, the main controller calculates and generates control parameters according to the control mode parameters and the rotating speed parameters of the magnetic control flywheel, and transmits the control parameters to the program control constant current source;
s4, controlling the exciting current of the electromagnet in real time by the program-controlled constant current source according to the received control parameters; the electromagnet changes the magnetic field intensity along with the change of exciting current, so that the resistance of the magnetic control flywheel is adjusted, and the fluid resistance is accurately simulated.
Preferably, in step S4, the excitation current Ie is calculated as:
wherein V is the rotation linear speed of the magnetic control flywheel.
Preferably, in step S4, the calculation formula of the magnetic field strength B of the line is:
wherein mu is magnetic permeability, N is the number of turns of the exciting coil, and Le is the effective magnetic path length.
Preferably, in step S4, the calculation formula of the resistance force F of the magnetically controlled flywheel in the magnetic field is as follows:
order theThen->
Wherein L is the length of the circuit, i.e. the width of the conductive layer; r is the resistance value of the section of line.
Drawings
FIG. 1 is a flow chart of the magnetic control resistance system of the present invention.
FIG. 2 is a diagram of the magnetic field generated when the magnetically controlled flywheel of the present invention is rotated.
Detailed Description
The invention will be described in further detail with reference to the drawings and the specific examples.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1 and 2;
the invention discloses a magnetic control resistance system for fitness equipment, which comprises: the device comprises a human-computer interface, a main controller, a rotating speed sensor, a program-controlled constant current source, an electromagnet and a magnetic control flywheel. The human-computer interface is used for setting a resistance control mode and inputting control mode parameters into the main controller; the rotating speed sensor is used for collecting the rotating speed of the magnetic control flywheel and transmitting the rotating speed parameter to the main controller; the main controller is used for calculating and generating control parameters according to the control mode parameters and the rotating speed parameters of the magnetic control flywheel, and transmitting the control parameters to the program-controlled constant current source; the program-controlled constant current source is electrically connected with the electromagnet and is used for controlling the exciting current of the electromagnet to change according to the control parameters calculated by the main controller so as to further control the magnetic field intensity of the electromagnet; the electromagnet is magnetically attracted with the magnetic control flywheel and is used for controlling the resistance of the magnetic control flywheel (namely, the magnetic control flywheel rotates in a magnetic field to cut the magnetic field to generate magnetic control resistance, and the magnetic control resistance of the magnetic control flywheel changes along with the change of the strength of the electromagnetic ferromagnetic field).
The magnetic control flywheel comprises a cast iron flywheel, wherein a conductive layer is arranged on the wheel surface of the cast iron flywheel, and the conductive layer can be made of copper or aluminum. The cast iron flywheel provides inertia and plays a role of a magnetizer to form a magnetic field as shown in fig. 2; the aluminum plate or the copper plate of the conductive layer can generate magnetic control resistance by the rotation of the cast iron flywheel and the cutting magnetic field.
After the human-computer interface is provided with the resistance mode, the rotating speed sensor can acquire the rotating speed of the magnetic control flywheel in real time and transmit the rotating speed parameter to the main controller, the main controller can calculate and generate the control parameter according to the control mode parameter and the rotating speed parameter of the magnetic control flywheel, and the exciting current of the electromagnet is accurately controlled by the program-controlled constant current source to change according to the set control mode, so that the magnetic control flywheel provides magnetic control fluid resistance close to the underwater rowing resistance, and meanwhile, the magnetic control resistance system also has the advantages of silence of magnetic resistance, smooth resistance and small volume.
The invention also provides a resistance control method of the magnetic control resistance system, which comprises the following steps:
s1, setting a required resistance control mode on a man-machine interface, and inputting control mode parameters into a main controller through an RS232 communication bus;
s2, the rotating speed sensor acquires the rotating speed of the magnetic control flywheel through ABC pulse and transmits the rotating speed parameter to the main controller through the CAN bus;
s3, the main controller calculates and generates control parameters according to the control mode parameters and the rotating speed parameters of the magnetic control flywheel, and transmits the control parameters to the program control constant current source through the ETHERCAT bus;
s4, controlling the exciting current of the electromagnet in real time through a power line according to the received control parameters by the program-controlled constant current source; the electromagnet changes the magnetic field intensity along with the change of exciting current, so that the resistance of the magnetic control flywheel is adjusted, and the fluid resistance is accurately simulated.
In the rotating process of the magnetic control flywheel, the resistance of the magnetic control flywheel in the magnetic field is F, and the calculation formula of F is as follows:
F＝BIL
wherein B is the magnetic induction intensity of the line, I is the magnitude of the sensing current, and L is the length of the line, namely the width of the conducting layer;
and L is fixed after the structure is finished, and the calculation formula of I is as follows:
wherein V is the rotation linear speed of the magnetic control flywheel, and R is the resistance value of the section of line;
therefore, the calculation formula of F can be changed to
In addition, the calculation formula of the electromagnetic ferromagnetic field intensity is as follows:
wherein mu is magnetic permeability, N is the number of turns of the exciting coil, ie is exciting current, le is effective magnetic path length,
order the
Then b= KIe
Combining the two formulas to obtain
Therefore, under the condition that the structures and materials of the magnetic flywheel and the electromagnet are fixed, the size of F is only related to the rotation speed V and the exciting current Ie of the magnetic flywheel;
when rowing, the resistance of the paddle is quantifiable and mainly is fluid viscosity resistance, and the resistance of the paddle is f, and the calculation formula of f is as follows:
where ρ is the density of the fluid, v is the speed of travel of the ship, S f For the surface area immersed in water, C f Is the coefficient of friction;
in the case of scene determination, ρ, v, S f 、C f It can be seen that f is positively correlated with the square of the velocity v, which can be considered a constant value;
when the resistance F is positively correlated with the square of the speed V during rowing, it is necessary to adjust F to be positively correlated with the square of the speed V, that is, to solve the relationship between the square of the exciting current Ie and the speed V,
let v=ie 2 Constant (constant)
F can be expressed as
F＝CV 2
Namely F is V 2 The positive correlation is that the exciting current Ie is adjusted in real time by measuring the rotating speed V of the magnetic flywheel, so that the change related to the speed V is realized, and the resistance effect close to the underwater rowing resistance is further realized.
The foregoing is merely illustrative of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that may be easily contemplated by those skilled in the art within the scope of the present invention should be included within the scope of the present invention, and the scope of the present invention shall be defined by the appended claims.
Claims (5)
1. A resistance control method of a magnetic control resistance system for fitness equipment is characterized in that:
the magnetic control resistance system comprises:
the system comprises a human-computer interface, a main controller, a rotating speed sensor, a program-controlled constant current source, an electromagnet and a magnetic control flywheel; the human-computer interface is used for setting a resistance control mode and inputting control mode parameters into the main controller; the rotating speed sensor is used for collecting the rotating speed of the magnetic control flywheel and transmitting rotating speed parameters to the main controller; the main controller is used for calculating and generating control parameters according to the control mode parameters and the rotating speed parameters of the magnetic control flywheel, and transmitting the control parameters to the program-controlled constant current source; the program-controlled constant current source is electrically connected with the electromagnet and is used for controlling the exciting current of the electromagnet to change according to the control parameters calculated by the main controller so as to control the magnetic field intensity of the electromagnet; the electromagnet is magnetically attracted with the magnetic control flywheel and is used for controlling the resistance of the magnetic control flywheel;
the resistance control method comprises the following steps:
s1, setting a required resistance control mode on a man-machine interface, and inputting control mode parameters into a main controller;
s2, a rotating speed sensor collects the rotating speed of the magnetic control flywheel and transmits rotating speed parameters to a main controller;
s3, the main controller calculates and generates control parameters according to the control mode parameters and the rotating speed parameters of the magnetic control flywheel, and transmits the control parameters to the program control constant current source;
s4, controlling the exciting current of the electromagnet in real time by the program-controlled constant current source according to the received control parameters; the electromagnet changes the magnetic field intensity along with the change of exciting current, so that the resistance of the magnetic control flywheel is adjusted, and the fluid resistance is accurately simulated;
in step S4, the calculation formula of the excitation current Ie is:
wherein V is the rotation linear speed of the magnetic control flywheel.
2. A resistance control method for a magnetically controlled resistance system of exercise equipment according to claim 1, wherein: the magnetic control flywheel comprises a cast iron flywheel, and a conductive layer is arranged on the surface of the cast iron flywheel.
3. A resistance control method for a magnetically controlled resistance system of exercise equipment according to claim 2, wherein: the conductive layer is made of copper or aluminum.
4. The resistance control method of a magnetic control resistance system according to claim 1, characterized in that: in step S4, the calculation formula of the magnetic field strength B of the line is:
wherein mu is magnetic permeability, N is the number of turns of the exciting coil, and Le is the effective magnetic path length.
5. The resistance control method of the magnetic control resistance system according to claim 4, wherein: in step S4, the calculation formula of the resistance force F of the magnetically controlled flywheel in the magnetic field is as follows:
order theThen->
Wherein L is the length of the circuit, i.e. the width of the conductive layer; r is the resistance value of the section of line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211010576.7A CN115738163B (en) | 2022-08-23 | 2022-08-23 | Magnetic control resistance system and resistance control method for fitness equipment |
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| CN202211010576.7A CN115738163B (en) | 2022-08-23 | 2022-08-23 | Magnetic control resistance system and resistance control method for fitness equipment |
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| CN115738163B true CN115738163B (en) | 2023-11-17 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2880159Y (en) * | 2006-02-23 | 2007-03-21 | 邱筠婷 | Flywheel magnetic controlled resistance apparatus of indoor sports equipment |
| CN201744114U (en) * | 2010-07-29 | 2011-02-16 | 申屠峻峰 | Electromagnet resistance generating device of magnetically-controlled vehicle |
| CN104815416A (en) * | 2015-04-29 | 2015-08-05 | 浙江利佳运动器材有限公司 | External magnetic field mechanism for magnetic exercise bike |
| CN108066966A (en) * | 2016-11-17 | 2018-05-25 | 桐乡创智体育科技有限公司 | Canoeing machine and its canoeing training method |
| US10874897B1 (en) * | 2020-07-02 | 2020-12-29 | David George Eastham, Jr. | Adjustable resistance weight sled with bias correction and wheel skid control |
| CN113694494A (en) * | 2021-09-01 | 2021-11-26 | 深圳动趣科技有限公司 | Exercise bicycle magnetic resistance control method and device and exercise bicycle |
-
2022
- 2022-08-23 CN CN202211010576.7A patent/CN115738163B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2880159Y (en) * | 2006-02-23 | 2007-03-21 | 邱筠婷 | Flywheel magnetic controlled resistance apparatus of indoor sports equipment |
| CN201744114U (en) * | 2010-07-29 | 2011-02-16 | 申屠峻峰 | Electromagnet resistance generating device of magnetically-controlled vehicle |
| CN104815416A (en) * | 2015-04-29 | 2015-08-05 | 浙江利佳运动器材有限公司 | External magnetic field mechanism for magnetic exercise bike |
| CN108066966A (en) * | 2016-11-17 | 2018-05-25 | 桐乡创智体育科技有限公司 | Canoeing machine and its canoeing training method |
| US10874897B1 (en) * | 2020-07-02 | 2020-12-29 | David George Eastham, Jr. | Adjustable resistance weight sled with bias correction and wheel skid control |
| CN113694494A (en) * | 2021-09-01 | 2021-11-26 | 深圳动趣科技有限公司 | Exercise bicycle magnetic resistance control method and device and exercise bicycle |
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| CN115738163A (en) | 2023-03-07 |
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