Treadmill internal rotation brushless motor system and treadmill adopting same

Abstract

The invention relates to the technical field of motors, and discloses a running machine internal rotation brushless motor system and a running machine adopting the system.The running machine internal rotation brushless motor system comprises a motor module and a magnetic induction module, the motor module comprises a middle shaft, and a permanent magnet is coaxially fixed to one end of the middle shaft; the magnetic induction module performs non-contact induction sampling on the permanent magnet, the magnetic induction module comprises a shell, a magnetic excitation body and an induction chip, the magnetic excitation body is rotationally arranged in the shell, the induction chip is fixedly arranged in the shell, and the permanent magnet, the magnetic excitation body and the induction chip are sequentially matched. The invention provides a non-contact induction sampling method on the application level of the treadmill motor, the sampling resolution precision is improved, the foot feeling during running start and stop is optimized, absolute and incremental output signals are provided in the magnetic induction module, different application requirements are met, high-precision position and speed feedback is realized, and the application range of the treadmill motor is widened. The control precision of the motor is improved, and the application range of the motor is widened.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more particularly to a treadmill internal brushless motor system and a treadmill using the same. Background Art

[0002] The motor of a treadmill needs to cope with different motion modes, such as walking, running, intermittent running, etc. These modes require the motor to operate at different speeds and loads. To ensure that these modes proceed smoothly during transition and avoid unexpected shutdowns or lack of power, the treadmill motor needs precise speed and position feedback to improve control accuracy.

[0003] The use of encoders and Hall sensors to sample the rotation state of motors has been a mature application on treadmills. However, traditional encoders have wear and maintenance problems due to their contact design with the motor shaft. In addition, Hall sensors have insufficient resolution accuracy, resulting in inaccurate sampling, poor running belt feel, and unstable starting and stopping, which limits their use in treadmill operation applications. Therefore, it is necessary to provide an integrated system of brushless motors and high-speed sensing modules to achieve non-contact sensing sampling and improve durability and measurement and recognition accuracy. Summary of the invention

[0004] The present invention provides a treadmill internal brushless motor system and a treadmill using the system, which solves the technical problems in the related art that traditional encoders have wear and maintenance problems due to their contact design with the motor shaft, and Hall sensing has inaccurate sampling due to insufficient resolution accuracy, resulting in a poor foot feel during running of the running belt, and unstable starting and stopping, which limits their use in treadmill running applications.

[0005] The present invention provides a treadmill internal rotation brushless motor system, comprising a motor module and a magnetic induction module, wherein the motor module comprises a central axis, a permanent magnet 1 is coaxially fixed at one end of the central axis, the magnetic induction module performs non-contact induction sampling on the permanent magnet 1, the magnetic induction module comprises a shell, a permanent magnet 2 and a sensing chip, the permanent magnet 2 is rotatably arranged in the shell, the sensing chip is fixedly arranged in the shell, and the permanent magnet 1, the permanent magnet 2 and the sensing chip are matched in sequence;

[0006] A plurality of sensing devices are evenly arranged on the sensing chip. When the motor module is working, when the central shaft drives the permanent magnet to rotate at a uniform speed for one circle, a plurality of sensing devices sense a plurality of waveform signals, and the sensed resolution is ≥12 bits, based on the output values ​​of a plurality of angle signals of each circumference of the permanent magnet sampled when the stator rotates;

[0007] The induction chip is used as an incremental encoder when adding a counting device, and is used as an absolute encoder when the induction chip outputs alone.

[0008] As a further solution of the present invention: the cross section of the second permanent magnet is in a boot shape, forming a covering surface on the top of the induction chip, and an annular foundation that rotatably cooperates with the second permanent magnet is fixedly arranged in the shell.

[0009] As a further solution of the present invention: the motor module also includes a shell, an end cover, a rotor, a stator, a bearing and a power cord. The end cover is detachably provided on one side of the shell. The rotor and stator that rotate with each other are provided in the shell. The central axis is fixed at the center of the rotor. A bearing is provided at the connection between the central axis and the end cover. One side of the motor module is electrically connected to a power cord that supplies power to it.

[0010] As a further solution of the present invention: the magnetic induction module is fixed at the center of the end cover through an installation component and aligned with the central axis. The installation component includes a column head, a bolt, a pad and a through slot. The column heads are symmetrically fixed on the end cover, and the column heads are provided with internal threads that cooperate with the bolts. The magnetic induction module is fixedly set on the back of the pad, and the pad is symmetrically provided with through slots. When the bolts are screwed into the column heads, they are inserted through the through slots. The through slots are arc-shaped, allowing the bolts to rotate around the center of the pad relative to the through slots.

[0011] As a further solution of the present invention: an isolation sleeve is arranged between the central axis and the permanent magnet, the isolation sleeve is provided with an installation opening for placing the permanent magnet, and the isolation sleeve is made of non-magnetic material.

[0012] As a further solution of the present invention: the resolution provided by the magnetic induction module is ≥12 bits.

[0013] As a further solution of the present invention: the sampling speed supported by the magnetic induction module is ≥3000RPM.

[0014] As a further solution of the present invention: the magnetic induction module supports an operating temperature range of -40°C to 125°C.

[0015] As a further solution of the present invention: a signal transmission line cooperating with the magnetic induction module is provided on one side of the motor module.

[0016] A treadmill adopts the above-mentioned treadmill internal brushless motor system, including a control center, a treadmill body and a power system. The treadmill body is provided with the control center and the power system. The control center cooperates with a magnetic induction module to control the operating parameters of the motor module according to the sampling results of the magnetic induction module. The motor module cooperates with the power system to provide drive for the operation of the power system.

[0017] The beneficial effects of the present invention are:

[0018] The present invention provides a non-contact inductive sampling method at the application level of treadmill motors, reducing wear and maintenance requirements.

[0019] The present invention provides absolute and incremental output signals to meet different application requirements.

[0020] The present invention realizes high-precision position and speed feedback and improves the control accuracy of the motor.

[0021] The present invention is suitable for high-speed applications and broadens the application range of the motor.

[0022] The present invention provides an innovative solution to replace the wear of traditional encoders and the insufficient sampling accuracy of Hall sampling angles.

[0023] In the setting of the magnetic induction module of the present invention, permanent magnet two is set to cover the sensing chip, so that when performing non-contact induction sampling, permanent magnet two can effectively guide the magnetic field changes of permanent magnet one to the vicinity of the sensing chip and concentrate them to the coverage area of ​​permanent magnet two, so that the sensing chip can more effectively sense the changes in the magnetic field, thereby improving the accuracy of the overall sampling by enhancing the conduction process.

[0024] In the setting of the magnetic induction module of the present invention, the permanent magnet 2 is set into a ring structure, which can help concentrate and strengthen the magnetic field around the sensing chip, concentrate the magnetic lines of force generated by the rotation of the permanent magnet 1, and direct them to the end of the sensing chip. In addition, the ring structure is surrounded to evenly distribute the magnetic field change to the four sensing devices, thereby improving the overall sampling accuracy from the direction of enhancing the sensing ability of the sensing devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the internal brushless motor system of the treadmill proposed by the present invention;

[0026] Figure 2 It is a schematic diagram of the exploded structure of the internal brushless motor system of the treadmill proposed by the present invention;

[0027] Figure 3 yes Figure 2 Detailed structural diagram at A in the middle;

[0028] Figure 4 It is a schematic diagram of the corresponding structure of the permanent magnet 1 and the magnetic induction module in the brushless motor system of the treadmill proposed by the present invention;

[0029] Figure 5 It is a schematic diagram of the first cross-sectional structure of the magnetic induction module layout in the first embodiment of the present invention;

[0030] Figure 6 It is a second cross-sectional structural diagram of the magnetic induction module layout in the first embodiment of the present invention;

[0031] Figure 7 It is a schematic diagram of the first cross-sectional structure of the magnetic induction module layout in the second embodiment of the present invention;

[0032] Figure 8 is a second cross-sectional structural diagram of the magnetic induction module layout in the second embodiment of the present invention;

[0033] Fig. 9 It is a schematic diagram of the induction principle in the brushless motor system of the treadmill proposed by the present invention;

[0034] Fig.10 It is a schematic diagram of the structure of the treadmill proposed by the present invention.

[0035] In the figure: 10, motor module; 100, housing; 101, end cover; 102, rotor; 103, central axis; 104, stator; 105, bearing; 106, power cord; 20, permanent magnet one; 21, mounting assembly; 211, column head; 212, bolt; 213, pad; 214, through slot; 200, magnetic induction module; 201, housing; 202, permanent magnet two; 203, induction chip; 204, induction device; 22, isolation sleeve; 220, installation port; 3, signal transmission line; 4, control center; 5, treadmill body; 6, power system. DETAILED DESCRIPTION

[0036] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that the discussion of these implementations is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Various examples may omit, replace, or add various processes or components as needed. In addition, the features described in some examples may also be combined in other examples.

[0037] Embodiment 1

[0038] The present invention discloses a brushless motor system for a treadmill, such as Figure 1 - Fig.10 As shown, it includes a motor module 10 and a magnetic induction module 200, the motor module 10 includes a central axis 103, one end of the central axis 103 is coaxially fixed with a permanent magnet 20, the magnetic induction module 200 performs non-contact induction sampling on the permanent magnet 20, the magnetic induction module 200 includes a shell 201, a permanent magnet 202 and a sensing chip 203, the permanent magnet 202 is rotatably arranged in the shell 201, the sensing chip 203 is fixedly arranged in the shell 201, and the permanent magnet 20, the permanent magnet 202 and the sensing chip 203 are matched in sequence;

[0039] A plurality of sensing devices 204 are evenly arranged on the sensing chip 203. The sensing chip 203 senses the NS pole switch signal of the permanent magnet 1 20 to detect the rotation angle of the central axis 103. According to this principle, the sensing chip 203 has several signal values ​​when the central axis 103 rotates one circle.

[0040] Specifically, four induction devices 204 are evenly arranged on the induction chip 203. When the motor module 10 is working, the middle shaft 103 drives the permanent magnet 20 to rotate at a constant speed for one circle. The voltage waveforms sensed by the four induction devices 204 are four sinusoidal waveforms with a phase difference of 90 degrees. According to the magnitude of the return voltage, the rotation angle value of the permanent magnet 20 is obtained.

[0041] The sensing chip 203 is used as an incremental encoder when adding a counting device, and is used as an absolute encoder when outputting alone (through a serial bus, PWM, SSI protocol, GrayCode, etc.).

[0042] The sensing chip 203 is mounted on the magnetic sensing module 200 through a mounting process.

[0043] It should be specially noted that the sensing chip 203 is a magnetic sensing chip or is not limited to a Hall chip and a magnetic sensing chip, and a corresponding sensing device 204 is selected.

[0044] The specific processing at the data end when converting between absolute encoder and incremental encoder is as follows:

[0045] The absolute encoder corresponds to natural binary code, and the incremental encoder corresponds to Gray code. The conversion between the data ends of the absolute encoder and the incremental encoder is the conversion between natural binary code and Gray code.

[0046] 1. Conversion of natural binary code to Gray code:

[0047] According to the conversion rules of natural binary code to Gray code, it is actually to shift the conversion number right by one bit and then perform an XOR operation with the conversion number. The program flow chart is as follows:

[0048] Save the input number TEMP; shift TEMP right by one bit and save SHILETEMP; XOR the shifted data with the original data and return the XORed data;

[0049] The program in the function block is as follows:

[0050] INPUT input variable type is DWORD;

[0051] The TEMP local variable type is DWORD;

[0052] The SHILETEMP local variable type is DWORD;

[0053] The return type of the BIN_TO_GRAY function block return variable is DWORD;

[0054] BIN_TO_GRAY:

[0055] TEMP:=INPUT;

[0056] SHILETEMP:=SHR_DWORD(TEMP,UNIT#1);

[0057] BIN_TO_GRAY:=SHILETEMP_XOR_INPUT;

[0058] 2. Gray code is converted to natural binary code:

[0059] According to the conversion rules of Gray code to natural binary code, it is actually to continuously perform XOR operations on Gray code and binary numbers, that is, to continuously perform XOR operations with different bits of itself. For example, if the original data is 32-bit A, then A is first moved right by one bit, XORed with itself, and then the value is retained as B. Then A is continued to be moved right by one bit, XORed with B, and retained as C, and so on, until A=1. The program flow chart is as follows:

[0060] Save the input number TEMP, INPUT1; if the input number is 0, then directly return data 0 and exit; if TEMP is not equal to 1, then loop, otherwise return the data; TEMP is shifted right by 1 bit and XORed with the input value;

[0061] The program in the function block is as follows:

[0062] INPUT input variable type is DWORD;

[0063] The TEMP local variable type is DWORD;

[0064] INPUT1 local variable type is DWORD;

[0065] The return type of the GRAY_TO_BIN function block return variable is DWORD;

[0066] GRAY_TO_BIN:

[0067] TEMP:=INPUT;

[0068] INPUT1:=INPUT;

[0069] IF TEMP=DWORD#0 THEN;

[0070] INPUT1:=DWORD#0;

[0071] GRAY_TO_BIN:=INPUT1;

[0072] RETURN;

[0073] END_IF;

[0074] WHILE TEMP<>DWORD#1 DO;

[0075] TEMP:=SHR_DWORD(TEMP,UINT#1);

[0076] INPUT1:=TEMP XOR INPUT1;

[0077] END_WHILE;

[0078] GRAY_TO_BIN:=INPUT1;

[0079] The cross section of the second permanent magnet 202 is in a boot shape, forming a covering surface on the top of the sensing chip 203 , and an annular base rotatably matched with the second permanent magnet 202 is fixedly arranged in the housing 201 .

[0080] Permanent magnet 202 is arranged to cover the sensing chip 203. In this way, when performing non-contact induction sampling, permanent magnet 202 can effectively guide the magnetic field changes of permanent magnet 1 20 to the vicinity of the sensing chip 203 and concentrate them to the coverage area of ​​permanent magnet 202, so that the sensing chip 203 can more effectively sense the changes in the magnetic field, thereby improving the overall sampling accuracy by enhancing the conduction process.

[0081] The motor module 10 also includes a shell 100, an end cover 101, a rotor 102, a stator 104, a bearing 105 and a power cord 106. The end cover 101 is detachably provided on one side of the shell 100. The rotor 102 and the stator 104 that rotate with each other are provided in the shell 100. The central axis 103 is fixed at the center of the rotor 102. A bearing 105 is provided at the connection between the central axis 103 and the end cover 101. One side of the motor module 10 is electrically connected to a power cord 106 that supplies power to it.

[0082] The magnetic induction module 200 is fixed at the center of the end cover 101 through the installation component 21 and is aligned with the central axis 103. The installation component 21 includes a column head 211, a bolt 212, a pad 213 and a through slot 214. The column head 211 is symmetrically fixed on the end cover 101. The column head 211 is provided with an internal thread that cooperates with the bolt 212. The magnetic induction module 200 is fixedly set on the back of the pad 213, and the pad 213 is symmetrically provided with through slots 214. When the bolt 212 is screwed into the column head 211, it passes through the through slot 214. The through slot 214 is arc-shaped, allowing the bolt 212 to rotate around the center of the pad 213 relative to the through slot 214.

[0083] The magnetic induction module 200 and the pad 213 are integrated. When installing them, it is necessary to adjust the alignment of the magnetic induction module 200 and the permanent magnet 20 to ensure accurate sampling. The specific adjustment operation is as follows:

[0084] First, move the pad 213 closer to the column head 211, and then pre-screw the bolt 212 into the column head 211 (without tightening) to leave a gap between the convex edge of the end of the bolt 212 and the pad 213. At this time, the pad 213 can rotate. After the rotation of the pad 213 aligns the position of the rotary encoder module with the permanent magnet 20, continue to screw in the bolt 212 until the convex edge of the bolt 212 presses the pad 213 to the end of the column head 211, so that the rotary encoder module and the permanent magnet 20 are accurately aligned, thereby ensuring the accuracy of sampling.

[0085] An isolation sleeve 22 is disposed between the central axis 103 and the permanent magnet 20 . The isolation sleeve 22 is provided with an installation opening 220 for placing the permanent magnet 20 . The isolation sleeve 22 is made of a non-magnetic material.

[0086] An isolation sleeve 22 made of non-magnetic material is disposed between the permanent magnet 20 and the metal central shaft 103 to ensure that the central shaft 103 will not interfere with the magnetic field of the permanent magnet 20 when rotating at a high speed.

[0087] The resolution provided by the magnetic induction module 200 is ≥12 bits.

[0088] The magnetic induction module 200 supports a sampling speed of ≥3000 RPM.

[0089] The magnetic induction module 200 supports an operating temperature range of -40°C to 125°C.

[0090] A signal transmission line 3 cooperating with the magnetic induction module 200 is disposed on one side of the motor module 10 .

[0091] Based on the above-mentioned treadmill internal brushless motor system, the present invention also provides a treadmill, including a control center 4, a treadmill body 5 and a power system 6. The treadmill body 5 is provided with the control center 4 and the power system 6. The control center 4 cooperates with the magnetic induction module 200 to control the operating parameters of the motor module 10 according to the sampling results of the magnetic induction module 200. The motor module 10 cooperates with the power system 6 to provide drive for the operation of the power system 6.

[0092] Embodiment 2

[0093] Different from the first embodiment, the magnetic induction module 200 adopts a different structural form, specifically:

[0094] refer to Figure 7 and Figure 8 The second permanent magnet 202 is in a ring shape and is arranged around the sensing chip 203. A plurality of square pad bases are fixedly arranged in the shell 201. A round ball body that rolls with the square pad base is arranged at the bottom of the second permanent magnet 202.

[0095] Setting the permanent magnet 202 into a ring structure can help concentrate and strengthen the magnetic field around the sensing chip 203, concentrate the magnetic lines of force generated by the rotation of the permanent magnet 1 20, and direct them to the end of the sensing chip 203. In addition, the ring structure is used to evenly distribute the magnetic field changes to the four sensing devices 204, thereby improving the overall sampling accuracy from the direction of enhancing the sensing capability of the sensing device 204.

[0096] The above describes an embodiment of the present invention, but this embodiment is not limited to the above-mentioned specific implementation mode. The above-mentioned specific implementation mode is merely illustrative and not restrictive. Under the guidance of this embodiment, ordinary technicians in this field can also make more forms of equivalent embodiments, all of which are within the protection of this embodiment.

Claims

1. The brushless motor system of the treadmill is characterized by: The invention comprises a motor module (10) and a magnetic induction module (200), wherein the motor module (10) comprises a central axis (103), a permanent magnet 1 (20) is coaxially fixed to one end of the central axis (103), the magnetic induction module (200) performs non-contact induction sampling on the permanent magnet 1 (20), the magnetic induction module (200) comprises a housing (201), a permanent magnet 2 (202) and a sensing chip (203), the permanent magnet 2 (202) is rotatably arranged in the housing (201), the sensing chip (203) is fixedly arranged in the housing (201), and the permanent magnet 1 (20), the permanent magnet 2 (202) and the sensing chip (203) are matched in sequence; A plurality of sensing devices (204) are evenly arranged on the sensing chip (203). When the motor module (10) is working, the middle shaft (103) drives the permanent magnet one (20) to rotate at a uniform speed for one circle, and the plurality of sensing devices (204) sense a plurality of waveform signals, the sensed resolution being ≥12 bits, and the output values ​​of a plurality of angle signals of each circumference of the permanent magnet two (202) are sampled according to the rotation of the stator; The sensing chip (203) is used as an incremental encoder when adding a counting device, and is used as an absolute encoder when outputting alone.

2. The treadmill internal brushless motor system according to claim 1, characterized in that: The cross section of the second permanent magnet (202) is in a boot shape, forming a covering surface on the top of the sensing chip (203), and an annular foundation that is rotatably matched with the second permanent magnet (202) is fixedly arranged in the shell (201).

3. The treadmill internal brushless motor system according to claim 1, characterized in that: The motor module (10) further comprises a housing (100), an end shield (101), a rotor (102), a stator (104), a bearing (105) and a power line (106); one side of the housing (100) is detachably provided with the end shield (101); the housing (100) is provided with a rotor (102) and a stator (104) that are rotatably matched with each other; the central axis (103) is fixed at the center of the rotor (102); a bearing (105) is provided at the connection between the central axis (103) and the end shield (101); and one side of the motor module (10) is electrically connected to a power line (106) for supplying power thereto.

4. The treadmill internal brushless motor system according to claim 1, characterized in that: The magnetic induction module (200) is fixed at the center of the end cover (101) through a mounting assembly (21) and is aligned with the central axis (103). The mounting assembly (21) comprises a column head (211), a bolt (212), a pad (213) and a through slot (214). The column head (211) is symmetrically fixedly arranged on the end cover (101). An internal thread matching the bolt (212) is provided in the column head (211). The magnetic induction module (200) is fixedly arranged on the back of the pad (213). The pad (213) is symmetrically provided with through slots (214). When the bolt (212) is screwed into the column head (211), it passes through the through slot (214). The through slot (214) is arc-shaped, allowing the bolt (212) to rotate around the center of the pad (213) relative to the through slot (214).

5. The treadmill internal brushless motor system according to claim 1, characterized in that: An isolation sleeve (22) is provided between the central axis (103) and the permanent magnet one (20), and a mounting opening (220) for placing the permanent magnet one (20) is provided in the isolation sleeve (22), and the isolation sleeve (22) is made of a non-magnetic material.

6. The treadmill internal brushless motor system according to claim 1, characterized in that: The magnetic induction module (200) provides a resolution of ≥12 bits.

7. The treadmill internal brushless motor system according to claim 1, characterized in that: The magnetic induction module (200) supports a sampling rotation speed of ≥3000 RPM.

8. The treadmill internally rotating brushless motor system according to claim 1, characterized in that: The magnetic induction module (200) supports an operating temperature range of -40°C to 125°C.

9. The treadmill internal brushless motor system according to claim 1, characterized in that: A signal transmission line (3) cooperating with the magnetic induction module (200) is provided on one side of the motor module (10).

10. A treadmill, using the treadmill internal brushless motor system according to any one of claims 1 to 9, characterized in that: The treadmill comprises a control center (4), a treadmill body (5) and a power system (6). The treadmill body (5) is provided with the control center (4) and the power system (6). The control center (4) cooperates with a magnetic induction module (200) to control the operating parameters of a motor module (10) according to the sampling result of the magnetic induction module (200). The motor module (10) cooperates with the power system (6) to provide drive for the operation of the power system (6).

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