High torque output micromotor

Abstract

The application relates to the technical field of micro motors, in particular to a high-torque-output micro motor, which comprises a casing, the casing is in a tubular shape, rear cover assemblies and front cover assemblies are arranged at the two ends of the casing respectively, a rotor assembly penetrating through the casing is arranged on the inner side of the casing, and a stator assembly is fixedly connected to the inner side of the casing. The Hall assembly and the motor controller are flexibly arranged on the outer side of the rear cover assembly, the micro motor has two working modes, the working mode can be selected according to actual requirements, the design of the rotor assembly, the stator assembly and the Hall assembly is optimized, the torque output performance of the motor is remarkably improved, the outer side of the rotor iron core is provided with annular grooves which are distributed at equal intervals, anaerobic glue is coated on the inner wall of the grooves, and magnetic steel is arranged in the grooves, the uniformity and stability of the magnetic field are enhanced, these improvements make the micro motor have higher torque output while keeping small size, and effectively solve the problems of insufficient adjustment speed of the automobile seat and automatic intelligentization.

Description

Technical Field

[0001] This invention relates to the field of micro motor technology, and more specifically to a high-torque output micro motor. Background Technology

[0002] Miniature motors are small electric motors that are widely used in consumer electronics, medical equipment, automotive parts, aircraft and other fields. In automobiles, miniature motors are used in car seats as electric drive devices to adjust the position of the car seat, drive the seat to move back and forth, tilt the backrest, raise and lower the height, and provide lumbar support. They are miniature DC motors or brushless motors and usually have the characteristics of high precision, low noise and long life.

[0003] However, while the miniature motors currently used in car seats have greatly reduced their size, the reduction in size also leads to a decrease in output torque, which affects the adjustment speed when adjusting the seat. To address this, we propose a miniature motor with high torque output. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a high torque output micro motor, which can effectively solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a high-torque output micro motor, including a housing, the housing being tubular in shape, a rear cover assembly and a front cover assembly respectively provided at both ends of the housing, a rotor assembly penetrating the housing being provided inside the housing, a stator assembly being fixedly connected to the inner side of the housing, and a Hall assembly being provided outside the rear cover assembly.

[0007] The micro motor also includes an electronic control unit (ECU), whose output is connected to a position sensor and a Hall sensor.

[0008] Preferably, the rotor assembly includes a shaft core disposed inside the housing, a balancing sleeve disposed outside the shaft core, a rotor core disposed outside the balancing sleeve, magnets evenly distributed in a ring on the outside of the rotor core, copper rings disposed at both ends of the rotor core, and a magnetic ring disposed at the end of the shaft core near the Hall assembly.

[0009] Preferably, the balancing sleeve is made of epoxy balancing mud and is used for dynamic balancing correction of the motor rotor. The outer side of the rotor core has grooves distributed in an annular pattern at equal intervals. The inner wall of the groove is coated with uniform anaerobic adhesive, and the magnet is installed on the inner wall of the corresponding groove.

[0010] Preferably, the stator assembly includes a wire frame mounted on the inner wall of the housing, with enameled wire wound on the outer side of the wire frame and a stator core disposed on the inner wall of the wire frame.

[0011] Preferably, the stator core is sleeved on the outside of the rotor assembly, the output end of the enameled wire is electrically connected to an atomic wire, and a slot for wire frame installation is provided on the outside of the stator core.

[0012] Preferably, the rear cover assembly includes a rear cover installed on the inner wall of the housing. The outer side of the housing has three first mounting holes that are evenly spaced. The inner wall of the first mounting holes is provided with a first countersunk bolt. The end of the first countersunk bolt near the housing passes through the first mounting hole and extends into the interior of the rear cover. The rear cover is movably connected to the outer side of the shaft core by a first ball bearing.

[0013] Preferably, the front cover assembly includes a front cover installed on the inner wall of the housing, and three equally spaced second mounting holes are provided on the outer side of the housing. The inner wall of the second mounting holes is provided with a second countersunk bolt. One end of the second countersunk bolt near the housing passes through the second mounting hole and extends into the interior of the front cover. The rear cover is movably connected to the outer side of the shaft core through a second ball bearing.

[0014] Preferably, the Hall component includes a circuit board disposed on the outside of the rear cover, three Hall sensors are mounted on the circuit board at equal intervals, and the output end of the circuit board is electrically connected to a Hall harness.

[0015] Preferably, a protective cover is installed on the outside of the circuit board, and a wire groove is opened on the outside of the protective cover. The other end of the Hall harness passes through the wire groove and extends to the outside of the protective cover.

[0016] Preferably, the circuit board has three through holes that are evenly spaced on the outside, and a pan head bolt is provided inside the through hole. The rear end cover is fixedly connected to three internally threaded rings that are evenly spaced on the outside. One end of the pan head bolt passes through the through hole and is threaded to the inner wall of the corresponding internally threaded ring.

[0017] The technical solution provided by this invention has the following advantages compared with the known prior art:

[0018] This invention enables the micro motor to operate in two modes by flexibly configuring Hall effect components and a motor controller on the outside of the rear cover assembly. Users can choose the mode according to their specific needs. Optimizing the design of the rotor, stator, and Hall effect components significantly improves the motor's torque output performance. The rotor assembly uses a balancing sleeve made of epoxy balancing clay for dynamic balancing, ensuring smooth rotor operation. The rotor core has annularly spaced grooves on its outer side, with the inner walls of the grooves coated with anaerobic adhesive and fitted with magnets, enhancing the uniformity and stability of the magnetic field. The stator assembly uses enameled wire wound onto a wire frame and mated with the stator core, optimizing electromagnetic induction efficiency. Furthermore, the Hall effect sensor in the Hall effect component, working in conjunction with the circuit board, achieves high-precision position feedback, further improving the motor's control accuracy and response speed. These improvements allow the micro motor to output higher torque while maintaining a compact size, effectively solving the problem of insufficient adjustment speed in car seats, while simultaneously ensuring both accuracy and reliability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the external overall structure of the micro motor Hall component of the present invention;

[0021] Figure 2 This is an exploded view of the components of the micro motor of the present invention;

[0022] Figure 3 This is a schematic diagram of the installation position of the Hall component of the present invention;

[0023] Figure 4 This is a schematic diagram showing the positions of the stator assembly and rotor assembly of the present invention;

[0024] Figure 5 This is a schematic diagram of the exploded structure of the Hall component of the present invention;

[0025] Figure 6 This is a partial structural diagram of the rotor assembly of the present invention;

[0026] Figure 7 This is a schematic diagram of a portion of the casing structure of the present invention;

[0027] Figure 8 This is a partial exploded structural diagram of the rotor assembly of the present invention;

[0028] Figure 9 This is a partial structural diagram of the stator assembly of the present invention;

[0029] Figure 10 This is a schematic diagram of the control system of the present invention;

[0030] Figure 11 This is a schematic diagram of the built-in overall structure of the micro motor Hall component of the present invention.

[0031] The labels in the diagram represent:

[0032] 1. Housing;

[0033] 2. Rear cover assembly; 201. Rear end cover; 202. First mounting hole; 203. First countersunk bolt;

[0034] 3. Hall effect assembly; 301. Magnetic ring; 302. Circuit board; 303. Hall effect harness; 304. Protective cover; 305. Hall effect sensor; 306. Cable tray; 307. Pan head bolt; 308. Internal threaded ring;

[0035] 4. Stator assembly; 401. Wire frame; 402. Enameled wire; 403. Base wire; 404. Stator core;

[0036] 5. Front cover assembly; 501. Front end cover; 502. Second ball bearing; 503. Second mounting hole; 504. Second countersunk bolt;

[0037] 6. Rotor assembly; 601. Magnet; 602. Shaft core; 603. Copper ring; 604. Rotor core; 605. Balance sleeve; 606. Groove. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] The present invention will be further described below with reference to embodiments.

[0040] Reference Figure 1-11 The present invention discloses a high torque output micro motor, including a housing 1, which is tubular in shape. A rear cover assembly 2 and a front cover assembly 5 are respectively provided at both ends of the housing 1. A rotor assembly 6 is provided inside the housing 1 and passes through the housing 1. A stator assembly 4 is fixedly connected to the inside of the housing 1. A Hall assembly 3 is provided outside the rear cover assembly 2.

[0041] The micro motor also includes an electronic control unit (ECU), whose output signal is connected to a position sensor and a Hall sensor 305.

[0042] It should be noted that this micro motor exists in two modes during actual production.

[0043] The first mode: external Hall component 3 mode of the micro motor, the Hall component 3 of the motor is installed on the outside of the rear cover;

[0044] The second mode: the Hall component 3 of the micro motor is built into the housing 1.

[0045] The only difference between the two modes is the position of Hal component 3; the positions of other structural components are the same.

[0046] Specifically, the rotor assembly 6 includes a shaft core 602 disposed inside the housing 1, a balance sleeve 605 disposed outside the shaft core 602, a rotor core 604 disposed outside the balance sleeve 605, magnets 601 arranged in a ring at equal intervals disposed outside the rotor core 604, copper rings 603 disposed at both ends of the rotor core 604, and a magnetic ring 301 disposed at the end of the shaft core 602 near the Hall assembly 3.

[0047] The shaft core 602 in the rotor assembly 6 drives the rotor core 604 to rotate. The magnets 601 distributed in a ring on its outer side generate electromagnetic induction with the enameled wires 402 on the stator core 404, driving the motor to run.

[0048] Furthermore, the balancing sleeve 605 is made of epoxy balancing mud and is used for dynamic balancing correction of the motor rotor. The outer side of the rotor core 604 is provided with grooves 606 distributed in an annular pattern at equal intervals. The inner wall of the grooves 606 is coated with uniform anaerobic adhesive, and the magnets 601 are installed on the inner wall of the corresponding grooves 606.

[0049] The balancing sleeve 605 is made of epoxy balancing mud to ensure rotor dynamic balance and reduce vibration, while the copper ring 603 and the magnet 601 fixed with anaerobic adhesive further improve magnetic field stability.

[0050] Specifically, the stator assembly 4 includes a wire frame 401 installed on the inner wall of the housing 1, with enameled wire 402 wound on the outside of the wire frame 401, and a stator core 404 provided on the inner wall of the wire frame 401.

[0051] Furthermore, the stator core 404 is sleeved on the outside of the rotor assembly 6, the output end of the enameled wire 402 is electrically connected to the atomic wire 403, and the outside of the stator core 404 is provided with a slot for mounting the wire frame 401.

[0052] The stator assembly 4's wire frame 401 and stator core 404 are tightly fitted by a slot, which optimizes the magnetic circuit efficiency and makes the torque output stronger.

[0053] Specifically, the rear cover assembly 2 includes a rear cover 201 installed on the inner wall of the housing 1. The outer side of the housing 1 has three first mounting holes 202 that are evenly spaced. The inner wall of the first mounting holes 202 is provided with a first countersunk bolt 203. The end of the first countersunk bolt 203 near the housing 1 passes through the first mounting hole 202 and extends into the interior of the rear cover 201. The rear cover 201 is movably connected to the outer side of the shaft core 602 by a first ball bearing.

[0054] Specifically, the front cover assembly 5 includes a front cover 501 installed on the inner wall of the housing 1. The outer side of the housing 1 has three second mounting holes 503 that are evenly spaced. The inner wall of the second mounting holes 503 is provided with a second countersunk bolt 504. The end of the second countersunk bolt 504 near the housing 1 passes through the second mounting hole 503 and extends into the interior of the front cover 501. The rear cover 201 is movably connected to the outer side of the shaft core 602 through a second ball bearing 502.

[0055] The front and rear cover assemblies 2 are fixed by countersunk bolts and the core 602 is supported by ball bearings to reduce friction loss and extend service life.

[0056] Specifically, Hall component 3 includes a circuit board 302 located on the outside of the rear cover 201, three Hall sensors 305 are mounted on the circuit board 302 at equal intervals, and the output terminal of the circuit board 302 is electrically connected to a Hall harness 303.

[0057] Furthermore, a protective cover 304 is installed on the outside of the circuit board 302, and a wire groove 306 is opened on the outside of the protective cover 304. The other end of the Hall harness 303 passes through the wire groove 306 and extends to the outside of the protective cover 304.

[0058] The protective cover 304 and the wire channel 306 are designed to protect the circuit board 302 from interference and ensure stable signal transmission.

[0059] Furthermore, the circuit board 302 has three through holes that are evenly spaced on the outside, and pan head bolts 307 are provided inside the through holes. The rear end cover 201 is fixedly connected to three internal threaded rings 308 that are evenly spaced on the outside. One end of the pan head bolt 307 passes through the through hole and is threaded to the inner wall of the corresponding internal threaded ring 308.

[0060] The Hall component 3 on the rear cover assembly 2 includes a Hall sensor 305 and a circuit board 302 to monitor the rotor position in real time. The signal is fed back to the control system through the Hall harness 303 to form a closed-loop regulation, ensuring accurate and reliable motor operation.

[0061] I. Core Control Architecture: Sensor + ECU Closed-Loop Control

[0062] The actual position of the pallet is monitored in real time by position sensors such as Hall effect sensor 305 and magnetic encoder. For example, a magnet is installed on the slide rail, and the sensor calculates the displacement distance by counting the number of magnetic poles, with an accuracy of millimeters. The sensor data is directly transmitted to the electronic control unit (ECU).

[0063] The ECU algorithm adjusts the motor drive current by generating a PWM pulse width modulation signal based on the difference between the user's input target position (such as the seat memory function command) and the current position feedback from the sensor, thus forming a closed-loop control.

[0064] II. Power and Transmission System Design

[0065] The high-precision reduction mechanism motor converts high-speed, low-torque output into low-speed, high-torque output through a reducer such as a planetary gear set, reducing mechanical vibration and improving control stability, and avoiding position drift caused by sudden load changes.

[0066] The precision transmission structure uses a ball screw or rack and pinion mechanism to convert the rotational motion of the motor into linear displacement. The ball screw boasts a high transmission efficiency of over 90% and micron-level repeatability, making it suitable for high-precision lifting applications.

[0067] Bidirectional motor control of permanent magnet DC motors achieves forward and reverse rotation by switching the direction of current, with the ECU precisely controlling the motor's start, stop, and direction as needed. Some systems use relays or H-bridge circuits to switch the current direction.

[0068] III. Safety Assurance and Error Correction

[0069] The motor has a built-in circuit breaker or fuse for overload protection. When jamming causes abnormal current, it automatically cuts off the power supply to prevent the motor from burning out. The rubber coupling in the transmission system can absorb sudden impact loads.

[0070] The software-tolerable algorithm ECU software sets a position error threshold such as ±2mm. When the deviation between the actual position and the target position exceeds the limit, a recalibration process is triggered, and the cumulative error is eliminated through multiple fine adjustments.

[0071] IV. Typical control process: taking backrest height adjustment as an example

[0072] The user presses the adjustment button, which sends the target position signal to the ECU;

[0073] The ECU starts the position sensor to read the current backrest height;

[0074] Compare the target value with the actual value to calculate the current direction and duration of the drive motor;

[0075] The motor drives the backrest to move via a reducer and a ball screw;

[0076] The sensor provides real-time feedback of new position data, and the ECU dynamically adjusts the motor until the error approaches zero.

[0077] Once the target position is reached, the motor is powered off and locked, and the system enters standby mode.

[0078] V. Advanced Technology Applications

[0079] Multi-motor coordinated control: High-end seats use multiple motors for zoned adjustment, such as four-way lumbar support. The ECU needs to coordinate the synchronous operation of each motor to ensure that the overall deformation meets expectations.

[0080] Self-learning memory function: Stores user-preferred locations in EEPROM, and quickly locates them by combining preset codes with real-time sensor data when recalled.

[0081] The above solution enables the lifting accuracy of the rear seat support in modern automobiles to reach ±1mm, while also ensuring responsiveness and reliability. For further improvement in control accuracy, a higher resolution magnetic encoder or additional photoelectric sensor redundancy verification can be employed.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-torque output micro motor, characterized in that, Includes a housing (1), which is tubular in shape. A rear cover assembly (2) and a front cover assembly (5) are respectively provided at both ends of the housing (1). A rotor assembly (6) is provided inside the housing (1) and a stator assembly (4) is fixedly connected to the inside of the housing (1). A Hall assembly (3) is provided outside the rear cover assembly (2). The micro motor also includes an electronic control unit (ECU), whose input terminals are connected to a position sensor and a Hall sensor (305). The rotor assembly (6) includes a shaft core (602) disposed inside the housing (1), a balance sleeve (605) disposed outside the shaft core (602), a rotor core (604) disposed outside the balance sleeve (605), magnets (601) arranged in a ring at equal intervals disposed outside the rotor core (604), copper rings (603) disposed at both ends of the rotor core (604), and a magnetic ring (301) disposed at the end of the shaft core (602) near the Hall assembly (3). The balancing sleeve (605) is made of epoxy balancing mud and is used for dynamic balancing correction of motor rotor. The rotor core (604) has grooves (606) distributed in an annular pattern at equal intervals on the outside. The inner wall of the groove (606) is coated with uniform anaerobic adhesive. The magnet (601) is installed on the inner wall of the corresponding groove (606).

2. The high-torque output micro motor according to claim 1, characterized in that, The stator assembly (4) includes a wire frame (401) installed on the inner wall of the housing (1), with enameled wire (402) wound on the outside of the wire frame (401), and a stator core (404) provided on the inner wall of the wire frame (401).

3. A high-torque output micro motor according to claim 2, characterized in that, The stator core (404) is sleeved on the outside of the rotor assembly (6), the output end of the enameled wire (402) is electrically connected to the terminal wire (403), and the outside of the stator core (404) is provided with a slot for mounting the wire frame (401).

4. A high-torque output micro motor according to claim 1, characterized in that, The rear cover assembly (2) includes a rear cover (201) installed on the inner wall of the housing (1). The outer side of the housing (1) has three first mounting holes (202) distributed at equal intervals. The inner wall of the first mounting hole (202) is provided with a first countersunk bolt (203). The end of the first countersunk bolt (203) near the housing (1) passes through the first mounting hole (202) and extends into the interior of the rear cover (201). The rear cover (201) is movably connected to the outer side of the shaft core (602) through a first ball bearing.

5. A high-torque output micro motor according to claim 4, characterized in that, The front cover assembly (5) includes a front cover (501) installed on the inner wall of the housing (1). The outer side of the housing (1) has three second mounting holes (503) distributed at equal intervals. The inner wall of the second mounting holes (503) is provided with a second countersunk bolt (504). The end of the second countersunk bolt (504) near the housing (1) passes through the second mounting hole (503) and extends into the interior of the front cover (501). The front cover (501) is movably connected to the outer side of the shaft core (602) through a second ball bearing (502).

6. A high-torque output micro motor according to claim 5, characterized in that, The Hall component (3) includes a circuit board (302) disposed on the outside of the rear cover (201), three Hall sensors (305) are mounted on the circuit board (302) at equal intervals, and the output end of the circuit board (302) is electrically connected to a Hall harness (303).

7. A high-torque output micro motor according to claim 6, characterized in that, A protective cover (304) is installed on the outside of the circuit board (302). A wire groove (306) is opened on the outside of the protective cover (304). The other end of the Hall harness (303) passes through the wire groove (306) and extends to the outside of the protective cover (304).

8. A high-torque output micro motor according to claim 6, characterized in that, The circuit board (302) has three through holes that are evenly spaced on the outside. Pan head bolts (307) are provided inside the through holes. Three internal threaded rings (308) that are evenly spaced are fixedly connected to the outside of the rear end cover (201). One end of the pan head bolt (307) passes through the through hole and is threaded to the inner wall of the corresponding internal threaded ring (308).

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