Brushless motor system and treadmill adopting same

Abstract

The invention relates to the technical field of motors, and discloses a brushless motor system and a treadmill adopting the system.The brushless motor system comprises an inner rotating brushless motor, an induction module and an installation module, an NS pole magnet is fixedly installed on an output shaft of the inner rotating brushless motor, the NS pole magnet is matched with the induction module, non-contact induction sampling is conducted, and the induction module is connected with the installation module; the induction module is fixed to the end, right opposite to an output shaft of the inner rotation brushless motor, of the installation module, an anti-interference module is arranged between the installation module and the inner rotation brushless motor in a matched mode, when vibration is generated, the anti-interference module drives the induction module and the NS pole magnet to still keep center alignment, and an induction collection part of the induction module cannot be separated from a collection area. Continuous magnetic field sampling is ensured, and the stability of encoder output signals is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the motor technology field, more particularly, it relates to a brushless motor system and a treadmill using the same. BACKGROUND

[0002] The motor of the treadmill needs to cope with different exercise modes, such as walking, running, intermittent running, etc. These modes require the motor to run at different speeds and loads. In order to ensure smooth transition of these modes and avoid unexpected shutdown or power shortage, precise speed and position feedback of the motor of the treadmill is required to improve control accuracy.

[0003] Using an encoder to sample the rotating state of the motor has been maturely applied in treadmills. However, the traditional encoder has wear and maintenance problems due to its contact design with the motor shaft, which limits its use in high-speed applications. Therefore, it is necessary to provide an integrated system of a brushless motor and a high-speed induction module to realize non-contact induction sampling and improve durability and measurement accuracy.

[0004] The magnetic rotary encoder relies on magnetic field changes to detect the movement of the motor shaft. When sampling, if the sensing part of the magnetic rotary encoder is not aligned with the center of the shaft, the magnetic field change received by the sensor will be irregular, resulting in signal distortion, affecting measurement accuracy, and causing the magnetic field sampling to be discontinuous, thereby affecting the stability of the encoder output signal and causing system control errors. However, in actual use, since the sampling system of the motor is applied to a treadmill, the high-speed rotation of the motor itself and the force of the person's foot stepping on the treadmill will cause the motor to vibrate up and down in the vertical direction, causing some interference to the sampling work of the encoder. Therefore, how to eliminate the interference of vibration has become a problem to be solved in the application of the integrated system of the brushless motor and the high-speed induction module. SUMMARY

[0005] The present application provides a brushless motor system and a treadmill using the same, which solves the technical problem of interference of vibration caused by the high-speed rotation of the motor itself and the force of the person's foot stepping on the treadmill to the sampling work of the encoder in the related art.

[0006] The present application provides a brushless motor system, which comprises an internal rotation brushless motor, an induction module and a mounting module. The output shaft of the internal rotation brushless motor is fixedly installed with an NS pole magnet. The NS pole magnet cooperates with the induction module to perform non-contact induction sampling. The induction module is fixed to the opposite end of the mounting module and the output shaft of the internal rotation brushless motor. The mounting module and the internal rotation brushless motor are cooperated with an anti-interference module. The anti-interference module comprises an outer frame, an inner frame and an automatic following assembly, the inner rotating brushless motor is externally fixed with the inner frame, and the upper and lower end faces of the inner frame and the upper and lower end faces of the installation module are both provided with the automatic following assembly, when vibration occurs at the inner frame, the automatic following assembly drives the installation module to vibrate synchronously, so that the NS pole magnet and the induction module are kept in central alignment.

[0007] As a further scheme of the present application, the automatic following assembly comprises a first rotating shaft, a second rotating shaft, a first rotating disc, a second rotating disc, a synchronous belt, a winding wheel, a steel cable, a hanging joint and a torsion spring, the first rotating shaft and the second rotating shaft are both rotatably installed in the outer frame, the first rotating disc is fixedly arranged on the first rotating shaft, the second rotating disc is fixedly arranged on the second rotating shaft, the first rotating disc and the second rotating disc are matched by the synchronous belt, the winding wheel is fixedly installed on the first rotating shaft and the second rotating shaft, the steel cable is wound on the winding wheel, one side of the steel cable is fixed with the installation module through the hanging joint, and the other side of the steel cable is fixed with the inner frame, and the second rotating shaft and the outer frame are matched with the torsion spring.

[0008] As a further scheme of the present application, the induction module comprises a magnetic exciter and a sensor plate, the magnetic exciter corresponds to the NS pole magnet, and the sensor plate is used for reading the rotation signal of the magnetic exciter.

[0009] As a further scheme of the present application, the resolution provided by the induction module is greater than or equal to 12 bits.

[0010] As a further scheme of the present application, the resolution allows the output of 4096 angle increment signals per circumference.

[0011] As a further scheme of the present application, the sampling rotating speed supported by the induction module is greater than or equal to 30000 RPM.

[0012] As a further scheme of the present application, the working temperature range supported by the induction module is from -40 DEG C to 125 DEG C.

[0013] A treadmill adopts the above brushless motor system, and the brushless motor system is used as a built-in power component of the treadmill.

[0014] The present application has the following advantages: When vibration occurs at the inner frame, the automatic following assembly drives the installation module to vibrate synchronously, so that the induction module and the NS pole magnet keep synchronous movement, so that the induction module and the NS pole magnet can keep central alignment even when vibration occurs, the induction collection part of the induction module does not deviate from the collection area, the magnetic field sampling is continuous, and the stability of the encoder output signal is improved.

[0015] The present application provides a non-contact induction sampling method, which reduces wear and maintenance requirements.

[0016] This invention achieves high-precision position and speed feedback, thereby improving the control accuracy of the motor.

[0017] This invention is suitable for high-speed applications, thus broadening the application range of motors. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall front view of the brushless motor system proposed in this invention; Figure 2 This is a schematic diagram of the overall three-dimensional structure of the brushless motor system proposed in this invention; Figure 3 This is a schematic diagram of the automatic following component structure in the brushless motor system proposed in this invention; Figure 4 This is a schematic diagram illustrating the working principle of the brushless motor system proposed in this invention; Figure 5 This is a schematic diagram illustrating the interaction between the induction module and the N / S pole magnets in the brushless motor system proposed in this invention. Figure 6 This is a schematic diagram of the sensor board in the brushless motor system proposed in this invention.

[0019] In the diagram: 10. Internal brushless motor; 100. N / S pole magnet; 20. Sensing module; 30. Mounting module; 40. Anti-interference module; 401. Outer frame; 402. Inner frame; 43. Automatic following component; 431. First rotating shaft; 432. Second rotating shaft; 433. First turntable; 434. Second turntable; 435. Synchronous belt; 436. Winding reel; 437. Steel stranded rope; 438. Lifting connector; 439. Torsion spring. Detailed Implementation

[0020] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0021] Example This invention discloses a brushless motor system, such as Figure 1 - Figure 6 As shown, it includes an internal rotary brushless motor 10, a sensing module 20 and a mounting module 30. An N-pole magnet 100 is fixedly mounted on the output shaft of the internal rotary brushless motor 10. The N-pole magnet 100 cooperates with the sensing module 20 to perform non-contact sensing sampling. The induction module 20 is fixed at the end of the output shaft of the inner rotation brushless motor 10 opposite to the installation module 30, and the anti-interference module 40 is matched between the installation module 30 and the inner rotation brushless motor 10; The anti-interference module 40 comprises an outer frame 401, an inner frame 402 and an automatic following assembly 43, the inner frame 402 is fixed outside the inner rotation brushless motor 10, the automatic following assembly 43 is arranged between the upper and lower end faces of the inner frame 402 and the installation module 30, when the inner frame 402 vibrates, the automatic following assembly 43 drives the installation module 30 to vibrate synchronously, so that the NS pole magnet 100 and the induction module 20 are kept in center alignment.

[0022] For the integrated system of the brushless motor and the high-speed induction module 20, the anti-interference module 40 is used to eliminate the vibration interference, when the treadmill is in the idle working state (no vibration generated by the user), in the inner rotation brushless motor 10 system of the treadmill, the induction module 20 and the NS pole magnet 100 are kept in center alignment, at this time, the induction module 20 can accurately sense the magnetic field change, when the treadmill is in the working state, the force generated by the running action of the user on the treadmill is transmitted to the inner rotation brushless motor 10, which will make the inner rotation brushless motor 10 vibrate up and down, in the actual situation, since the sensing and collecting part of the induction module 20 has a smaller collecting range than the size of the NS pole magnet 100, it cannot completely cover the collecting area, and the up and down vibration will cause the sensing and collecting part of the induction module 20 to deviate from the collecting area, resulting in sampling error, in order to eliminate this error, when the inner frame 402 vibrates, the automatic following assembly 43 drives the installation module 30 to vibrate synchronously, so that the induction module 20 and the NS pole magnet 100 keep synchronous movement, so that even when the vibration is generated, the induction module 20 and the NS pole magnet 100 can still keep center alignment, the sensing and collecting part of the induction module 20 will not deviate from the collecting area, ensuring continuous magnetic field sampling and improving the stability of the encoder output signal.

[0023] As Figure 3As shown, the automatic following assembly 43 comprises a first rotating shaft 431, a second rotating shaft 432, a first rotating disc 433, a second rotating disc 434, a synchronous belt 435, a winding wheel 436, a steel cable 437, a hanging joint 438 and a torsion spring 439. The first rotating shaft 431 and the second rotating shaft 432 are both rotatably installed in the outer frame 401. The first rotating disc 433 is fixedly arranged on the first rotating shaft 431. The second rotating disc 434 is fixedly arranged on the second rotating shaft 432. The first rotating disc 433 and the second rotating disc 434 are cooperated through the synchronous belt 435. The winding wheel 436 is fixedly installed on the first rotating shaft 431 and the second rotating shaft 432. The steel cable 437 is wound on the winding wheel 436. One side of the steel cable 437 is fixed with the installation module 30 through the hanging joint 438. The other side of the steel cable 437 is fixed with the inner frame 402. The second rotating shaft 432 is cooperated with the outer frame 401 through the torsion spring 439.

[0024] The specific implementation that the induction module 20 keeps synchronous movement with the NS pole magnet 100 is realized through the automatic following assembly 43. When the inner rotating brushless motor 10 itself runs to generate up-down vibration and the person uses the treadmill to generate up-down vibration acting on the inner rotating brushless motor 10, the inner frame 402 will pull the steel cable 437. The movement of the steel cable 437 drives the winding wheel 436 to rotate, converts the linear action of up-down vibration into rotary output, thereby driving the second rotating shaft 432 to rotate. When the second rotating shaft 432 rotates, the synchronous rotating structure formed by the combination of the first rotating disc 433, the second rotating disc 434 and the synchronous belt 435 makes the first rotating shaft 431 generate the same rotation amount. In this way, the steel cable 437 on the side of the first rotating shaft 431 also generates the same up-down movement amount. In this way, the installation module 30 fixed through the hanging joint 438 generates synchronous up-down movement, that is, the induction module 20 keeps synchronous movement with the NS pole magnet 100, thereby eliminating the interference influence generated by vibration.

[0025] It needs to be specially pointed out that, in the above, the torsion spring 439 is cooperatively arranged at the rotary connection end of the second rotating shaft 432, thereby providing the second rotating shaft 432 with rotation return ability.

[0026] The induction module 20 comprises a magnetic exciter and a sensor plate. The magnetic exciter corresponds to the NS pole magnet 100. The sensor plate is used for reading the rotation signal of the magnetic exciter.

[0027] The principle of the induction module 20 for non-contact induction sampling of the output shaft of the inner rotating brushless motor 10 includes the following specific implementations: I. Hall effect sensing The sensor board is a Hall sensor, which determines the angle, speed or position of the shaft by detecting the change of the magnetic field on the shaft. A small magnet or magnetic marker (NS magnet 100) is installed on the output shaft of the inner rotating brushless motor 10, and the NS magnet 100 rotates with the output shaft of the inner rotating brushless motor 10. Due to the corresponding magnetic excitation body and NS magnet 100, synchronous rotation is generated. The Hall sensor detects the change of the magnetic field generated by the rotation of the magnetic excitation body, thereby calculating the specific position or speed of the output shaft of the inner rotating brushless motor 10.

[0028] Through the Hall effect sensor, it is widely used in position feedback, speed monitoring, angle sensing and other aspects in motor control system.

[0029] Second, magnetic encoder: Combined with the non-contact measurement method of magnetic induction and encoding technology, in this application mode, the sensor board is built-in with the counting module of the encoder. A coding disc (NS magnet 100) with magnetic material is installed on the output shaft of the inner rotating brushless motor 10. When the output shaft of the inner rotating brushless motor 10 rotates, the magnetic material changes the distribution of the surrounding magnetic field. The sensor board detects these changes and compares them with the counting module of the built-in encoder to generate corresponding angle or position information.

[0030] Through the magnetic encoder, it is widely used in high-precision angle measurement, position detection and speed control system of motor rotating shaft.

[0031] The resolution provided by the sensing module 20 is greater than or equal to 12 bits.

[0032] The sampling speed supported by the sensing module 20 is greater than or equal to 30000 RPM.

[0033] The working temperature range supported by the sensing module 20 is from -40℃ to 125℃.

[0034] The above describes the embodiments of the present application, but the embodiments are not limited to the specific implementation described above. The specific implementation described above is only illustrative and not limiting. Those skilled in the art can make more forms of equivalent embodiments under the inspiration of the embodiments, which are all within the protection scope of the embodiments.

Claims

1. A brushless motor system, characterized by, It comprises an inner rotation brushless motor (10), an induction module (20) and a mounting module (30), the output shaft of the inner rotation brushless motor (10) is fixedly provided with an NS pole magnet (100), the NS pole magnet (100) cooperates with the induction module (20) to perform non-contact induction sampling. The induction module (20) is fixed on the mounting module (30) and the output shaft of the inner rotation brushless motor (10) opposite one end, the mounting module (30) and the inner rotation brushless motor (10) are cooperated with an anti-interference module (40). The anti-interference module (40) comprises an outer frame (401), an inner frame (402) and an automatic following assembly (43), the inner rotation brushless motor (10) is fixedly provided with the inner frame (402), the upper and lower end faces of the inner frame (402) and the upper and lower end faces of the mounting module (30) are both provided with the automatic following assembly (43), when the inner frame (402) vibrates, the automatic following assembly (43) drives the mounting module (30) to vibrate synchronously, so that the NS pole magnet (100) and the induction module (20) keep center alignment.

2. The brushless motor system of claim 1, wherein, The automatic following assembly (43) comprises a first rotating shaft (431), a second rotating shaft (432), a first rotating disc (433), a second rotating disc (434), a synchronous belt (435), a winding wheel (436), a steel cable (437), a hanging joint (438) and a torsion spring (439), the first rotating shaft (431) and the second rotating shaft (432) are both rotatably installed in the outer frame (401), the first rotating shaft (431) is fixedly provided with the first rotating disc (433), the second rotating shaft (432) is fixedly provided with the second rotating disc (434), the first rotating disc (433) and the second rotating disc (434) are cooperated through the synchronous belt (435), the first rotating shaft (431) and the second rotating shaft (432) are both fixedly installed with the winding wheel (436), the winding wheel (436) is wound with the steel cable (437), one side of the steel cable (437) is fixed with the mounting module (30) through the hanging joint (438), the other side of the steel cable (437) is fixed with the inner frame (402), the second rotating shaft (432) and the outer frame (401) are cooperated with the torsion spring (439).

3. The brushless motor system of claim 1, wherein, The induction module (20) comprises a magnetic exciter and a sensor plate, the magnetic exciter corresponds to the NS pole magnet (100), and the sensor plate is used for reading the rotation signal of the magnetic exciter.

4. The brushless motor system of claim 1, wherein, The resolution provided by the induction module (20) is greater than or equal to 12 bits.

5. The brushless motor system of claim 4, wherein, The resolution allows the output of 4096 angle increment signals per circumference.

6. The brushless motor system of claim 1, wherein, The sampling rotation speed supported by the induction module (20) is greater than or equal to 30000 RPM.

7. The brushless motor system of claim 1, wherein, The working temperature range supported by the induction module (20) is from -40℃ to 125℃.

8. A treadmill employing the brushless motor system as claimed in any one of claims 1 to 7, characterized by, The brushless motor system is used as a built-in power component of a running machine.

Images