High-torque output micro motor

Abstract

The invention relates to the technical field of micro motors, in particular to a high-torque-output micro motor which comprises a tubular shell, a rear cover assembly and a front cover assembly are arranged at the two ends of the shell respectively, a rotor assembly penetrating through the shell is arranged on the inner side of the shell, a stator assembly is fixedly connected to the inner side of the shell, and the stator assembly is fixedly connected to the outer side of the shell. The Hall assembly and the motor controller are flexibly arranged on the outer side of the rear cover assembly, so that the micro motor has two working modes which can be selected according to actual requirements, the torque output performance of the motor is remarkably improved by optimizing the design of the rotor assembly, the stator assembly and the Hall assembly, the annular grooves distributed at equal intervals are formed in the outer side of the rotor iron core, and the torque output performance of the motor is improved. The inner wall of the groove is coated with the anaerobic adhesive and provided with the magnetic steel, the uniformity and stability of a magnetic field are enhanced, through the improvement, the miniature motor can output higher torque while the small size is kept, and the problems that an automobile seat is insufficient in adjusting speed and automatic and intelligent are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of micro motors, and in particular to a micro motor with high torque output. Background Art

[0002] A micro motor refers to an electric motor with a small size, which is widely used in consumer electronics, medical equipment, automotive parts, aircraft and other fields. In automobiles, micro motors are used in car seats. They are electric drive devices used to adjust the position of car seats, drive the seat to move forward and backward, tilt the backrest, raise and lower the height, support the lumbar support, etc. They are micro DC motors or brushless motors, and usually have the characteristics of high precision, low noise and long life.

[0003] However, although the micro motors currently used in car seats have greatly reduced their size, the reduction in size also results in a decrease in output torque, which in turn affects the adjustment speed during seat adjustment. To this end, we propose a high-torque output micro motor. Summary of the Invention

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

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] The present invention provides a high-torque output micro motor, comprising a casing, the casing being tubular, a rear cover assembly and a front cover assembly being respectively provided at both ends of the casing, a rotor assembly penetrating the casing being provided on the inside of the casing, a stator assembly being fixedly connected to the inside of the casing, and a Hall assembly being provided on the outside of the rear cover assembly;

[0007] The micro motor further comprises an electronic control unit ECU, wherein an output terminal signal of the electronic control unit ECU is connected to a position sensor and a Hall sensor.

[0008] Preferably, the rotor assembly includes a shaft core arranged on the inner side of the casing, a balancing sleeve is arranged on the outer side of the shaft core, a rotor core is arranged on the outer side of the balancing sleeve, magnetic steels distributed in a ring shape with equal intervals are arranged on the outer side of the rotor core, copper rings are arranged at both ends of the rotor core, and a magnetic ring is arranged on the end of the shaft core close to 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 is provided with annular grooves distributed at equal intervals. The inner wall of the groove is coated with uniform anaerobic glue, and the magnetic steel is installed on the inner wall of the corresponding groove.

[0010] Preferably, the stator assembly includes a bobbin mounted on the inner wall of the casing, an enameled wire is wound around the outer side of the bobbin, and a stator core is provided on the inner wall of the bobbin.

[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 installing a wire rack is provided on the outside of the stator core.

[0012] Preferably, the rear cover assembly includes a rear end cover installed on the inner wall of the casing, three first mounting holes distributed at equal intervals are opened on the outside of the casing, a first countersunk bolt is provided on the inner wall of the first mounting hole, the first countersunk bolt passes through the first mounting hole close to the end of the casing and extends into the interior of the rear end cover, and the rear end cover is movably connected to the outside of the shaft core through a first ball bearing.

[0013] Preferably, the front cover assembly includes a front end cover mounted on the inner wall of the casing, three second mounting holes distributed at equal intervals are opened on the outside of the casing, a second countersunk bolt is provided on the inner wall of the second mounting hole, the second countersunk bolt passes through the second mounting hole at one end close to the casing and extends into the interior of the front end cover, and the rear end cover is movably connected to the outside of the shaft core through a second ball bearing.

[0014] Preferably, the Hall component includes a circuit board arranged on the outside of the rear end cover, the three Hall sensors are installed 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, a wire groove is opened on the outside of the protective cover, and the other end of the Hall wiring harness passes through the wire groove and extends to the outside of the protective cover.

[0016] Preferably, three through holes distributed at equal intervals are opened on the outside of the circuit board, pan head bolts are provided on the inside of the through holes, three internal thread rings distributed at equal intervals are fixedly connected to the outside of the rear end cover, one end of the pan head bolt passes through the through hole and is threadedly connected to the inner wall of the corresponding internal thread ring.

[0017] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0018] By flexibly configuring the Hall assembly and motor controller on the outside of the rear cover assembly, the present invention enables the micromotor to have two operating modes, which can be selected according to actual needs. By optimizing the design of the rotor assembly, stator assembly, and Hall assembly, the torque output performance of the motor is significantly improved. The rotor assembly uses a balancing sleeve made of epoxy balancing mud for dynamic balancing correction to ensure smooth rotor operation. The outer side of the rotor core is provided with annular grooves with equal spacing, and the inner wall of the groove is coated with anaerobic adhesive and installed with magnetic steel, which enhances the uniformity and stability of the magnetic field. The stator assembly is wound with enameled wire by a wire rack and cooperates with the stator core to optimize the electromagnetic induction efficiency. In addition, the Hall sensor in the Hall assembly cooperates with the circuit board to achieve high-precision position feedback, further improving the control accuracy and response speed of the motor. These improvements enable the micromotor to output higher torque while maintaining a compact size, effectively solving the problem of insufficient car seat adjustment speed while taking into account both accuracy and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

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

[0021] Figure 2 This is a schematic diagram of the exploded structure 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 It is a schematic diagram of the positions of the stator assembly and the rotor assembly of the present invention;

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

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

[0026] Figure 7 It is a partial structural diagram of the casing of the present invention;

[0027] Figure 8 This is a schematic diagram of a partially exploded structure of a rotor assembly of the present invention;

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

[0029] Figure 10 Schematic diagram of the control system of the present invention;

[0030] Figure 11 Schematic diagram of the overall structure of the micro motor Hall component of the present invention.

[0031] The numbers in the figure represent:

[0032] 1. Casing;

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

[0034] 3. Hall assembly; 301. Magnetic ring; 302. Circuit board; 303. Hall wiring harness; 304. Protective cover; 305. Hall sensor; 306. Wire duct; 307. Pan head bolt; 308. Internal thread ring;

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

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

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

[0038] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

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

[0040] Reference Figure 1-11 The present invention discloses a high-torque output micro motor, comprising a housing 1, the housing 1 being tubular, with a rear cover assembly 2 and a front cover assembly 5 provided at both ends of the housing 1, a rotor assembly 6 penetrating the housing 1 provided on the inside of the housing 1, a stator assembly 4 fixedly connected to the inside of the housing 1, and a Hall assembly 3 provided on the outside of the rear cover assembly 2;

[0041] The micro motor further includes an electronic control unit ECU, and the output terminal signal of the electronic control unit ECU is connected to a position sensor and a Hall sensor 305 .

[0042] It should be noted that: this micro motor has two modes in the actual production process;

[0043] The first mode: the Hall component 3 of the micro motor is externally installed. The Hall component 3 of the motor is installed outside the rear end cover.

[0044] The second mode: the Hall component 3 of the micro motor is built-in mode, and the Hall component 3 of the motor is installed inside the housing 1;

[0045] The above two modes differ only in the position of Hall 3 component, and the other structural positions are the same.

[0046] Specifically, the rotor assembly 6 includes a shaft core 602 arranged on the inner side of the casing 1, a balancing sleeve 605 is arranged on the outside of the shaft core 602, a rotor core 604 is arranged on the outside of the balancing sleeve 605, and magnets 601 distributed in a ring shape with equal intervals are arranged on the outside of the rotor core 604. Copper rings 603 are arranged at both ends of the rotor core 604, and a magnetic ring 301 is arranged at one end of the shaft core 602 close to the Hall assembly 3.

[0047] The shaft core 602 in the rotor assembly 6 drives the rotor core 604 to rotate, and the magnetic steel 601 distributed in an annular manner on the outer side thereof generates electromagnetic induction with the enameled wire 402 on the stator core 404, driving the motor to operate.

[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 annular grooves 606 with equal spacing. The inner wall of the groove 606 is coated with uniform anaerobic glue, and the magnetic steel 601 is installed on the inner wall of the corresponding groove 606.

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

[0050] Specifically, the stator assembly 4 includes a bobbin 401 mounted on the inner wall of the housing 1 , an enameled wire 402 is wound around the outer side of the bobbin 401 , and a stator core 404 is provided on the inner wall of the bobbin 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 a slot for installing the wire rack 401 is provided on the outside of the stator core 404 .

[0052] The bobbin 401 of the stator assembly 4 and the stator core 404 are tightly matched through the slots, which optimizes the magnetic circuit efficiency and makes the torque output stronger.

[0053] Specifically, the rear cover assembly 2 includes a rear end cover 201 installed on the inner wall of the casing 1. Three first mounting holes 202 are opened on the outside of the casing 1 and are distributed at equal intervals. A first countersunk bolt 203 is provided on the inner wall of the first mounting hole 202. The end of the first countersunk bolt 203 close to the casing 1 passes through the first mounting hole 202 and extends into the interior of the rear end cover 201. The rear end cover 201 is movably connected to the outside of the shaft core 602 through a first ball bearing.

[0054] Specifically, the front cover assembly 5 includes a front end cover 501 installed on the inner wall of the casing 1, and three second mounting holes 503 distributed at equal intervals are opened on the outside of the casing 1. A second countersunk bolt 504 is provided on the inner wall of the second mounting hole 503. The second countersunk bolt 504 passes through the second mounting hole 503 at one end close to the casing 1 and extends into the interior of the front end cover 501. The rear end cover 201 is movably connected to the outside of the shaft core 602 through the second ball bearing 502.

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

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

[0057] Furthermore, 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 wire 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 slot 306 are designed to protect the circuit board 302 from interference and ensure stable signal transmission.

[0059] Furthermore, three through holes distributed at equal intervals are opened on the outside of the circuit board 302, and pan head bolts 307 are arranged on the inside of the through holes. Three internal thread rings 308 distributed at equal intervals 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 threadedly connected to the inner wall of the corresponding internal thread ring 308.

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

[0061] 1. Core control architecture: sensor + ECU closed-loop control

[0062] The actual position of the rear pallet is monitored in real time by position sensors such as the Hall effect sensor 305 and a magnetic encoder. For example, if a magnet is installed on the slide rail, the sensor calculates the displacement distance by counting the number of magnetic poles, with an accuracy of up to 1112 millimeters. The sensor data is directly transmitted to the electronic control unit (ECU).

[0063] ECU algorithm adjustment: The ECU generates a PWM pulse width modulation signal based on the difference between the user-input target position, such as the seat memory function command, and the current position feedback from the sensor. This adjusts the magnitude and direction of the motor drive current to form a closed-loop control.

[0064] 2. 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, 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 motor's rotational motion into linear displacement. The ball screw has a high transmission efficiency of over 90% and micron-level repeatability, making it suitable for high-precision lifting scenarios.

[0067] Bidirectional motor control: A permanent magnet DC motor switches the current direction to achieve forward and reverse rotation. The ECU precisely controls the motor's start, stop, and direction of rotation based on demand. Some systems use relays or H-bridge circuits to achieve current direction switching.

[0068] 3. Security Assurance and Error Correction

[0069] Overload protection mechanism: The motor has a built-in circuit breaker or fuse, which automatically cuts off the power supply when a jam causes abnormal current flow to prevent the motor from burning out. The rubber coupling in the transmission system can absorb sudden impact loads.

[0070] Software fault-tolerant algorithm ECU software sets a position error threshold of ±2mm, for example. When the deviation between the actual position and the target position exceeds the limit, a recalibration process is triggered, and the accumulated error is eliminated through multiple fine-tuning.

[0071] 4. Typical control process: taking backrest lifting as an example

[0072] The user presses the adjustment button to send 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 and calculate the current direction and duration of the driving motor;

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

[0076] The sensor feeds back new position data in real time, and the ECU dynamically adjusts the motor until the error approaches zero;

[0077] After reaching the target position, the motor is powered off and locked, and the system enters standby mode;

[0078] 5. Advanced Technology Application

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

[0080] Self-learning memory function: The user's preferred position is stored in EEPROM, and when called, the preset code and real-time sensor data are combined to quickly locate the position.

[0081] This solution enables modern automotive seat rear support panels to achieve a ±1mm accuracy, while also ensuring both speed and reliability. Further precision can be achieved by using a higher-resolution magnetic encoder or adding redundant photoelectric sensors.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A high torque output micro motor, characterized in that: The invention comprises a casing (1), wherein the casing (1) is arranged in a tubular shape, a rear cover assembly (2) and a front cover assembly (5) are respectively arranged at both ends of the casing (1), a rotor assembly (6) penetrating the casing (1) is arranged on the inner side of the casing (1), a stator assembly (4) is fixedly connected to the inner side of the casing (1), and a Hall assembly (3) is arranged on the outer side of the rear cover assembly (2); The micro motor further comprises an electronic control unit ECU, wherein the output terminal signal of the electronic control unit ECU is connected to a position sensor and a Hall sensor (305).

2. A high torque output micro motor according to claim 1, characterized in that: The rotor assembly (6) comprises a shaft core (602) arranged on the inner side of the casing (1), a balancing sleeve (605) is arranged on the outer side of the shaft core (602), a rotor core (604) is arranged on the outer side of the balancing sleeve (605), magnetic steel (601) distributed in an annular shape and at equal intervals is arranged on the outer side of the rotor core (604), copper rings (603) are arranged at both ends of the rotor core (604), and a magnetic ring (301) is arranged at one end of the shaft core (602) close to the Hall assembly (3).

3. A high torque output micro motor according to claim 2, characterized in that: 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 annular grooves (606) distributed at equal intervals. The inner wall of the groove (606) is coated with uniform anaerobic glue. The magnetic steel (601) is installed on the inner wall of the corresponding groove (606).

4. A high torque output micro motor according to claim 1, characterized in that: The stator assembly (4) comprises a bobbin (401) mounted on the inner wall of the housing (1), an enameled wire (402) is wound around the outer side of the bobbin (401), and a stator core (404) is provided on the inner wall of the bobbin (401).

5. A high torque output micro motor according to claim 4, 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 atomic wire (403); and a slot for installing the wire rack (401) is provided on the outside of the stator core (404).

6. The high torque output micro motor according to claim 1, characterized in that: The rear cover assembly (2) includes a rear end cover (201) mounted on the inner wall of the housing (1); three first mounting holes (202) distributed at equal intervals are opened on the outer side of the housing (1); first countersunk bolts (203) are provided on the inner walls of the first mounting holes (202); one end of the first countersunk bolts (203) close to the housing (1) passes through the first mounting holes (202) and extends into the interior of the rear end cover (201); the rear end cover (201) is movably connected to the outer side of the shaft core (602) through a first ball bearing.

7. The high torque output micro motor according to claim 1, characterized in that: The front cover assembly (5) includes a front cover (501) mounted on the inner wall of the housing (1); three second mounting holes (503) distributed at equal intervals are opened on the outer side of the housing (1); second countersunk bolts (504) are provided on the inner walls of the second mounting holes (503); one end of the second countersunk bolts (504) close to the housing (1) passes through the second mounting holes (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).

8. The high torque output micro motor according to claim 1, characterized in that: The Hall component (3) comprises a circuit board (302) arranged outside the rear end cover (201), three Hall sensors (305) are mounted on the circuit board (302) at equal intervals, and an output end of the circuit board (302) is electrically connected to a Hall wiring harness (303).

9. The high torque output micro motor according to claim 8, 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), and the other end of the Hall wiring harness (303) passes through the wire groove (306) and extends to the outside of the protective cover (304).

10. The high torque output micro motor according to claim 8, characterized in that: The outer side of the circuit board (302) is provided with three through holes distributed at equal intervals, and the inner sides of the through holes are provided with pan head bolts (307). The outer side of the rear end cover (201) is fixedly connected with three internal thread rings (308) distributed at equal intervals, and one end of the pan head bolt (307) passes through the through hole and is threadedly connected to the inner wall of the corresponding internal thread ring (308).

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