A rotation measuring structure applied to a brushless wiper motor

Abstract

The utility model discloses a kind of rotation measurement structures applied to brushless wiper motor, brushless wiper motor includes: driving mechanism and output mechanism are arranged in shell body. The transmission rod piece in driving mechanism one end is inserted into the rotation part of driving mechanism, and the other end of transmission rod piece is transmissionally connected with output mechanism. First magnetic ring is set on transmission rod piece, and is set close to driving mechanism side, first hall sensor is close to first magnetic ring setting, the rotation angle of transmission rod piece is measured in real time. Second magnetic ring is set on output rod piece, and is close to the input end of output rod piece, second hall sensor is close to second magnetic ring setting, the rotation angle of output rod piece is measured in real time. The utility model is by setting first measurement component and second measurement component on transmission rod piece and output rod piece respectively, using the cooperation of two measurement components, the rotation amount of transmission rod piece and output rod piece can be measured respectively, to accurately calculate the actual rotation amount of motor.

Description

Technical Field

[0001] This utility model belongs to the field of wiper motors, and particularly relates to a rotation measurement structure applied to brushless wiper motors. Background Technology

[0002] Brushless wiper motors are a new type of motor technology that has been widely used in the automotive industry in recent years. Traditional wiper motors mostly use brushed DC motors, which generally suffer from the following problems: Short wear and lifespan: Mechanical friction exists between the brushes and commutator in brushed motors, causing the brushes to wear out quickly and requiring regular replacement, increasing maintenance costs. Noise issues: The friction between the brushes and commutator generates noticeable noise, affecting driving comfort. Unstable speed: Traditional motors have low speed control precision, making it difficult to achieve accurate speed adjustment. High energy consumption: Brushed motors have relatively low efficiency and consume more energy. Brushless wiper motors, compared to brushed DC motors, improve upon many of these shortcomings.

[0003] However, the accuracy of rotation measurement in brushless wiper motors directly affects their control performance and application effects. High-precision rotation measurement can achieve precise position control, stable speed control, and optimized dynamic performance. Current methods for measuring the rotation of brushless wiper motors primarily involve placing Hall effect sensors on the motor stator to detect the position of the rotor's magnetic poles. When the rotor rotates, the Hall sensor outputs pulse signals. By counting the number of pulses and calculating the pulse frequency, the motor's speed and position information can be obtained. However, this method is limited in accuracy by the resolution of the Hall sensor. Furthermore, energy loss inevitably occurs when the motor transmits power from the drive end to the output end. Current technologies only measure the motor's rotation, and the actual rotation at the output end is lower than the detected value. This error directly affects the measured rotation value of the brushless wiper motor, thus impacting high-precision control. Therefore, there is an urgent need to design a rotation measurement structure for brushless wiper motors. Utility Model Content

[0004] The technical objective of this invention is to provide a rotation measurement structure for brushless wiper motors to solve the technical problem of low accuracy in existing rotation measurement methods.

[0005] To solve the above problems, the technical solution of this utility model is as follows:

[0006] A rotation measurement structure for a brushless wiper motor, the brushless wiper motor including: a housing, a drive mechanism and an output mechanism, the drive mechanism and the output mechanism being disposed in the housing; a transmission rod is disposed in the drive mechanism, one end of the transmission rod extending into the drive mechanism and achieving a transmission connection, and the other end of the transmission rod being transmission connected to the output mechanism;

[0007] It is also provided with a first measuring component connected to the transmission rod. The first measuring component includes a first magnetic ring and a first Hall sensor. The first magnetic ring is sleeved on the transmission rod and is set close to the drive mechanism. The first Hall sensor is set close to the first magnetic ring. The first Hall sensor and the first magnetic ring cooperate with each other and are configured to measure the rotation angle of the transmission rod in real time.

[0008] The output mechanism includes an output rod, a transmission gear, and a second measuring component. The transmission gear is connected to the transmission rod and is fitted onto the output rod, allowing the output rod to rotate synchronously with the transmission gear. The second measuring component includes a second magnetic ring and a second Hall sensor. The second magnetic ring is fitted onto the output rod and positioned near one end of the transmission gear, while the second Hall sensor is positioned close to the second magnetic ring. The second Hall sensor and the second magnetic ring cooperate with each other and are configured to measure the rotation angle of the output rod in real time.

[0009] More preferably, the drive mechanism further includes a stator, a rotor, an iron core, and magnets;

[0010] The iron core is connected to the transmission rod;

[0011] The rotor has a first circular through hole at its center, and the iron core is placed inside the first circular through hole;

[0012] Magnets are wrapped around and attached to the side of the rotor;

[0013] The stator is wrapped around and attached to the inner wall of the housing, and is positioned corresponding to the magnet.

[0014] The mounting bracket is located inside the outer casing and along the path of the transmission rod. The mounting bracket is fixed inside the outer casing and is configured to mount the first Hall sensor circuit board. The first Hall sensor circuit board is equipped with a first Hall sensor, and an inwardly recessed notch is formed on the top of the first Hall sensor circuit board. The transmission rod passes through the notch and is connected to the output mechanism for transmission. The first magnetic ring is sleeved on the transmission rod, located between the first Hall sensor circuit board and the iron core, and is positioned close to the first Hall sensor circuit board.

[0015] More preferably, the output mechanism further includes a metal support plate and a second Hall sensor circuit board;

[0016] A second Hall sensor circuit board is fixedly installed inside the bottom of the outer casing at the output mechanism, and a second Hall sensor is installed on the second Hall sensor circuit board.

[0017] The metal support plate is located above the second Hall sensor circuit board and is fixedly connected to the housing. The center of the metal support plate has a second circular through hole, through which the output rod passes. The metal support plate is configured to limit the output rod.

[0018] The transmission gear is located above the metal support plate. A third circular through hole is opened in the center of the transmission gear. The output rod passes through the third circular through hole. The transmission gear is configured to rotate under the drive of the transmission rod and drive the output rod to rotate.

[0019] The output rod has a second magnetic ring installed at the end that extends out of the second circular through hole, and the position of the second magnetic ring corresponds to that of the second Hall sensor.

[0020] The outer edge of the transmission gear is toothed, and the side of the transmission rod that connects to the transmission gear is helical, so that the transmission rod and the transmission gear mesh and connect.

[0021] Specifically, the second Hall sensor circuit board also integrates a main control chip, which is configured to receive rotation signals collected by the first Hall sensor and the second Hall sensor.

[0022] Because of the adoption of the above technical solution, this utility model has the following advantages and positive effects compared with the prior art:

[0023] This invention, by setting a first measuring component and a second measuring component on the transmission rod and the output rod respectively, and by utilizing the cooperation of the first magnetic ring with the first Hall sensor and the second magnetic ring with the second Hall sensor, can measure the rotation of the transmission rod and the output rod respectively, thereby accurately calculating the actual rotation of the motor.

[0024] This invention achieves high-precision real-time measurement of the rotation angle of a brushless wiper motor through innovative structural design and measurement mechanism, while also possessing advantages such as compact structure, high reliability, and optimized transmission efficiency. This rotation measurement structure is particularly suitable for automotive wiper systems with high requirements for accuracy and reliability, and can significantly improve the performance of brushless wiper motors. Attached Figure Description

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0026] Figure 1 This is an internal structural diagram of a rotation measurement structure for a brushless wiper motor according to the present invention;

[0027] Figure 2 This is a partially enlarged schematic diagram of the drive mechanism of this utility model;

[0028] Figure 3 This is an internal sectional view of the output mechanism of this utility model.

[0029] Explanation of reference numerals in the attached figures

[0030] 1: First Hall sensor circuit board; 2: Magnetic ring; 3: Mounting bracket; 4: Stator; 5: Rotor; 6: Magnet; 7: Iron core; 8: Transmission rod; 9: Output rod; 10: Rotating gear; 11: Second Hall sensor circuit board; 12: Second Hall sensor. Detailed Implementation

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0032] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0033] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the rotation measurement structure for a brushless wiper motor according to this utility model. The advantages and features of this utility model will become clearer from the following description and claims.

[0034] Example

[0035] See Figures 1 to 3 This embodiment provides a rotation measurement structure for a brushless wiper motor. The overall structure can be divided into a housing, a drive mechanism, and an output mechanism. The drive mechanism and output mechanism are housed within the housing. Figure 1 As shown, part of the outer shell is hidden, allowing a direct view of its internal structure.

[0036] See Figure 1 and Figure 2The drive mechanism is described below. It includes a transmission rod 8, a first measuring component, a stator 4, a rotor 5, an iron core 7, and a magnet 6. The rotor 5 is located inside the drive mechanism, with a first circular through-hole at its center. The iron core 7 is housed within this through-hole, and one end of the iron core 7 is connected to the transmission rod 8. The magnet 6 is attached to the side of the rotor 5, while the stator 4 is attached to the inner wall of the outer casing and corresponds to the magnet 6. One end of the transmission rod extends into the drive mechanism (which can be understood as a rotating part) and is connected to the iron core 7. The other end of the transmission rod is connected to the output mechanism. The stator 4 of the drive mechanism is a coil winding armature, and the magnet 6 and rotor 5 together form a permanent magnet rotor. During operation, the rotor 5 drives the iron core 7, causing the transmission rod 8 to rotate around its own axis.

[0037] See Figure 1 and Figure 2 In this embodiment, the first measuring component includes a first magnetic ring 2 and a first Hall sensor. The first magnetic ring 2 is sleeved on the transmission rod 8 and positioned near the drive mechanism. The first Hall sensor is positioned close to the first magnetic ring 2. The first Hall sensor and the first magnetic ring 2 cooperate to measure the rotation angle of the transmission rod 8 in real time. Further, a mounting bracket 3 is provided inside the housing and along the path of the transmission rod 8. The mounting bracket 3 is fixed inside the housing and is used to mount the aforementioned first Hall sensor circuit board 1, on which the first Hall sensor is mounted. The top of the aforementioned first Hall sensor circuit board 1 has an inwardly recessed notch, through which the transmission rod 8 passes and is connected to the output mechanism. Specifically, the first magnetic ring 2 is sleeved on the transmission rod 8, positioned between the first Hall sensor circuit board 1 and the iron core 7, and positioned close to the first Hall sensor circuit board 1.

[0038] See Figure 3The output mechanism includes an output rod 9, a second measuring component, a transmission gear 10, a metal support plate, and a second Hall sensor circuit board 11. The second Hall sensor circuit board 11 is fixedly mounted at the bottom of the output mechanism inside the housing, and a second Hall sensor 12 is mounted on the second Hall sensor circuit board 11. The metal support plate is located above the second Hall sensor circuit board 11 and is fixedly connected to the housing. A second circular through hole is opened in the center of the metal support plate, through which the output rod 9 passes, allowing for rotation. The metal support plate limits the output rod 9 to prevent it from shifting during rotation. The transmission gear 10 is located above the metal support plate, with a third circular through hole opened in its center, through which the output rod 9 passes. The outer edge of the transmission gear 10 is toothed, and the side of the transmission rod 8 connected to the transmission gear 10 is helical, allowing the transmission rod 8 to mesh with the transmission gear 10. The transmission gear 10 rotates under the drive of the transmission rod 8, thus causing the transmission rod 8 to rotate as well.

[0039] See Figure 3 Specifically, the second measuring component includes a second magnetic ring 2 and a second Hall sensor 12. The second magnetic ring 2 is sleeved on the end of the output rod 9 and close to the input end of the output rod 9. The second Hall sensor 12 is not only mounted on the second Hall sensor circuit board 11, but also positioned correspondingly to the second magnetic ring 2. Through the interaction of the second Hall sensor 12 and the second magnetic ring 2, the rotation angle of the output rod 9 can be measured in real time. Preferably, the second Hall sensor circuit board 11 also integrates a main control chip, which is configured to receive the rotation signals collected by the first Hall sensor and the second Hall sensor 12.

[0040] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A rotation measuring structure applied to a brushless wiper motor, characterized by, The brushless wiper motor comprises an outer shell, a driving mechanism and an output mechanism, the driving mechanism and the output mechanism are arranged in the outer shell, a transmission rod is arranged in the driving mechanism, one end of the transmission rod extends into the driving mechanism and is transmissionally connected, the other end of the transmission rod is transmissionally connected with the output mechanism; A first measuring assembly connected with the transmission rod is further arranged, the first measuring assembly comprises a first magnetic ring and a first Hall sensor, the first magnetic ring is sleeved on the transmission rod and is arranged close to one side of the driving mechanism, the first Hall sensor is arranged close to the first magnetic ring, the first Hall sensor and the first magnetic ring are matched with each other and are configured to measure the rotation angle of the transmission rod in real time; An output rod, a transmission gear and a second measuring assembly are arranged in the output mechanism, the transmission gear is transmissionally connected with the transmission rod and is sleeved on the output rod, the output rod rotates synchronously with the transmission gear, the second measuring assembly comprises a second magnetic ring and a second Hall sensor, the second magnetic ring is sleeved on the output rod and is arranged close to one end of the transmission gear, the second Hall sensor is arranged close to the second magnetic ring, the second Hall sensor and the second magnetic ring are matched with each other and are configured to measure the rotation angle of the output rod in real time.

2. The rotation measuring structure for a brushless wiper motor according to claim 1, wherein The driving mechanism further comprises a stator, a rotor, an iron core and a magnet; The iron core is connected with the transmission rod; A first circular through hole is formed in the center of the rotor, and the iron core is arranged in the first circular through hole; The magnet is attached to the side surface of the rotor; The stator is attached to the inner wall of the outer shell and is arranged corresponding to the magnet.

3. The rotation measuring structure for a brushless wiper motor according to claim 2, wherein An installation frame is arranged in the outer shell and on the path of the transmission rod, the installation frame is fixed to the inside of the outer shell, and the installation frame is configured to install a first Hall sensor circuit board, the first Hall sensor is installed on the first Hall sensor circuit board, and a recess is formed in the top of the first Hall sensor circuit board, the transmission rod passes through the recess and is transmissionally connected with the output mechanism, and the first magnetic ring is sleeved on the transmission rod and is arranged between the first Hall sensor circuit board and the iron core and close to the first Hall sensor circuit board.

4. The rotation measuring structure for a brushless wiper motor according to claim 1, wherein The output mechanism further comprises a metal support plate and a second Hall sensor circuit board; The second Hall sensor circuit board is fixedly installed on the inner bottom of the outer shell at the output mechanism, and the second Hall sensor is installed on the second Hall sensor circuit board; The metal support plate is arranged above the second Hall sensor circuit board and is fixedly connected with the outer shell, a second circular through hole is formed in the center of the metal support plate, the output rod passes through the second circular through hole, and the metal support plate is configured to limit the output rod. The transmission gear is located above the metal support plate, a third circular through hole is formed in the center of the transmission gear, the output rod member is arranged in the third circular through hole, and the transmission gear is configured to rotate under the driving of the transmission rod member and drive the output rod member to rotate.

5. The rotation measuring structure for a brushless wiper motor according to claim 4, wherein The end of the output rod member extending out of the second circular through hole is provided with the second magnetic ring, and the position of the second magnetic ring corresponds to the second Hall sensor.

6. The rotation measuring structure for a brushless wiper motor according to claim 4, wherein The outer edge of the transmission gear is in a tooth shape, and the side surface of one end of the transmission rod member connected with the transmission gear is in a spiral shape, so that the transmission rod member is connected with the transmission gear in meshing.

7. The rotation measuring structure for a brushless wiper motor according to claim 4, wherein The second Hall sensor circuit board is also integrated with a master control chip, and the master control chip is configured to receive the rotation signals collected by the first Hall sensor and the second Hall sensor.

Images