Treadmill internal brushless motor system and treadmill using the same

Abstract

The present invention relates to the field of motor technology, and discloses a treadmill internal rotation brushless motor system and a treadmill adopting the system. The treadmill internal rotation brushless motor system includes a motor module and a magnetic induction module. The motor module includes a central axis, and a permanent magnet one is coaxially fixed at one end of the central axis. The magnetic induction module performs non-contact induction sampling of the permanent magnet. The magnetic induction module includes a shell, a permanent magnet two and an induction chip. The permanent magnet two is rotatably arranged in the shell, and the induction chip is fixedly arranged in the shell. The permanent magnet one, the permanent magnet two and the induction chip cooperate in sequence. The present invention provides a non-contact induction sampling method at the application level of the treadmill motor, improves the sampling resolution accuracy, optimizes the foot feel when starting and stopping running, and provides absolute and incremental output signals in the magnetic induction module to meet different application requirements, realize high-precision position and speed feedback, improve the control accuracy of the motor, and broaden the scope of use of the motor.

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 treadmill motor 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 transitions and avoid unexpected shutdowns or insufficient 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 the motor has been a mature application on treadmills. However, due to the contact design with the motor shaft, traditional encoders have wear and maintenance problems. In addition, the insufficient resolution accuracy of Hall sensors causes inaccurate sampling, poor running belt feel, and unstable starting and stopping, which limits their use in treadmill operation applications. Therefore, it is very necessary to provide an integrated system of brushless motors and high-speed sensing modules to achieve non-contact sensing sampling, 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 poor foot feel during running, unstable starting and stopping, and a poor experience, which limits their use in treadmill operation applications.

[0005] The present invention provides a treadmill internal rotation brushless motor system, including a motor module and a magnetic induction module. The motor module includes a central shaft, one end of which is coaxially fixed with a permanent magnet 1, and the magnetic induction module performs non-contact induction sampling on the permanent magnet 1. The magnetic induction module includes a housing, a permanent magnet 2, and a sensing chip. The permanent magnet 2 is rotatably disposed in the housing, and the sensing chip is fixedly disposed in the housing. The permanent magnet 1, the permanent magnet 2, and the sensing chip cooperate in sequence.

[0006] The sensing chip is evenly arranged with a plurality of sensing devices. When the motor module is working, when the central shaft drives the permanent magnet 1 to rotate at a uniform speed for one circle, the plurality of sensing devices sense a plurality of waveform signals with a resolution of ≥12 bits. The output values ​​of the plurality of angle signals of each circle of the permanent magnet 2 are sampled according to the rotation of the central shaft.

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

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

[0009] As a further solution of the present invention: the motor module also includes a casing, an end shield, a rotor, a stator, a bearing and a power cord. The end shield is detachably provided on one side of the casing. The rotor and stator that rotate with each other are provided in the casing. 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 shield. 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 assembly and is aligned with the central axis. The installation assembly 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. The bolts pass through the through slots when they are screwed into the column heads. The through slots are arc-shaped, allowing the bolts to rotate relative to the through slots around the center of the pad.

[0011] As a further solution of the present invention: an isolation sleeve is provided 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 the 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. In this way, 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 in 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 configuration of the magnetic induction module of the present invention, the permanent magnet 2 is configured as 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 used to surround the magnetic field so that the change in the magnetic field is evenly distributed to the four sensing devices, thereby improving the accuracy of the overall sampling from the perspective of enhancing the sensing capability of the sensing devices. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0028] Figure 4 This 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 This 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 This is a schematic diagram of the second cross-sectional structure of the magnetic induction module layout in the first embodiment of the present invention;

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

[0033] Figure 9 Schematic diagram of the induction principle in the brushless motor system of the treadmill proposed by the present invention;

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

[0035] In the figure: 10, motor module; 100, housing; 101, end shield; 102, rotor; 103, central shaft; 104, stator; 105, bearing; 106, power cord; 20, permanent magnet one; 21, mounting assembly; 211, stud; 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, mounting 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 exemplary embodiments. It should be understood that these embodiments are discussed solely to enable those skilled in the art to better understand and implement the subject matter described herein, and that the functions and arrangements of the elements discussed may be varied without departing from the scope of this specification. Various examples may omit, substitute, or add various processes or components as needed. Furthermore, features described for some examples may be combined in other examples.

[0037] Example 1

[0038] The present invention discloses a brushless motor system for a treadmill. Figure 1 - Figure 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 housing 201, a second permanent magnet 202 and a sensing chip 203, the second permanent magnet 202 is rotatably set in the housing 201, the sensing chip 203 is fixedly set in the housing 201, and the permanent magnet 20, the second permanent magnet 202 and the sensing chip 203 are matched in sequence;

[0039] The sensing chip 203 is evenly arranged with a plurality of sensing devices 204. The sensing chip 203 senses the N-S pole switching signal of the permanent magnet 20 to detect the rotation angle of the central axis 103. Based on this principle, the sensing chip 203 detects several signal values ​​when the central axis 103 rotates one circle.

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

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

[0042] The sensing chip 203 is mounted on the magnetic induction 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 an absolute encoder and an 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 mutual conversion between natural binary code and Gray code.

[0046] 1. Convert natural binary code to Gray code:

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

[0048] Save the input number TEMP; shift TEMP right by one position 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 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 on different bits of itself. For example, if the original data is 32-bit A, then first shift A one bit to the right, perform XOR operations with itself, and then retain the value B. Then continue to shift A one bit to the right, perform XOR operations with B, and retain the value 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] The INPUT1 local variable type is DWORD;

[0065] The return type of the GRAY_TO_BIN function block 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 . An annular base is fixedly provided in the housing 201 and rotatably cooperates with the second permanent magnet 202 .

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

[0081] The motor module 10 also includes a housing 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 housing 100. The rotor 102 and the stator 104 that rotate with each other are provided in the housing 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 heads 211 are symmetrically fixed on the end cover 101. The column heads 211 are provided with internal threads that cooperate with the bolts 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 relative to the through slot 214 around the center of the pad 213.

[0083] The magnetic induction module 200 and the backing plate 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 it), so that there is 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 orientation 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 orientation of the rotary encoder module and the permanent magnet 20 are accurately aligned, thereby ensuring the accuracy of sampling.

[0085] An isolation sleeve 22 is provided 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 provided between the permanent magnet 1 20 and the metal central shaft 103 to ensure that the central shaft 103 does not interfere with the magnetic field of the permanent magnet 1 20 when rotating at 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 provided 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 a control center 4 and a 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] Example 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. Several square pad bases are fixedly arranged in the shell 201. A round ball is provided at the bottom of the second permanent magnet 202 to roll with the square pad base.

[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 perspective 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 methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Ordinary technicians in this field can also make more forms of equivalent embodiments based on the inspiration of this embodiment, all of which are protected by this embodiment.

Claims

1. The brushless motor system in 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 (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 (20), the magnetic induction module (200) comprises 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; 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 1 (20) to rotate uniformly for one circle, and the plurality of sensing devices (204) sense a plurality of waveform signals, the sensed resolution of which is ≥12 bits. The output values ​​of the plurality of angle signals of each circumference of the permanent magnet 2 (202) are sampled according to the rotation of the middle shaft (103); 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; The cross section of the second permanent magnet (202) is in the shape of a boot, forming a covering surface on the top of the sensing chip (203), and an annular base is fixedly provided in the shell (201) and is rotatably matched with the second permanent magnet (202).

2. The treadmill internal rotation 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 an end shield (101); a rotor (102) and a stator (104) that rotate with each other are provided in the housing (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 shield (101); and one side of the motor module (10) is electrically connected to a power line (106) for supplying power thereto.

3. The treadmill internal rotation brushless motor system according to claim 2, 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) 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 provided on the back of the pad (213), and the pad (213) is symmetrically provided with a through slot (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).

4. The treadmill internal rotation 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 (20). The isolation sleeve (22) is provided with a mounting opening (220) for placing the permanent magnet (20). The isolation sleeve (22) is made of a non-magnetic material.

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

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

7. The treadmill internal rotation 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.

8. The treadmill internal rotation 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).

9. A treadmill, using the treadmill internal brushless motor system according to any one of claims 1 to 8, 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 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).

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