阅读说明：本技术 一种自复位有限转角力矩电机 (Self-resetting limited angle torque motor ) 是由 李玉涛 贾国超 李吉兴 曹宽 于 2019-12-09 设计创作，主要内容包括：本发明属于电机领域,具体涉及一种自复位有限转角力矩电机,解决因涡卷弹簧损伤失效导致有限转角无刷直流力矩电机无法正常复位的问题,包括复位定子与复位转子；复位定子包括复位机座、至少两个复位磁钢座及至少两个复位定子磁钢；复位机座为环形座体的端面开设至少两个U型槽；复位磁钢座固定在复位机座上,每个座体上均固定一个复位定子磁钢；复位转子包括复位转子支架及至少一对复位转子磁钢；复位转子磁钢相对设置在复位转子支架的外壁；并与复位定子磁钢相对。通过永磁结构复位,实现有限转角力矩电机的快速复位,结构更加简单,不存在涡卷弹簧断裂失效的风险,能适应复杂的环境条件,可靠性明显提高。(The invention belongs to the field of motors, and particularly relates to a self-resetting limited angle torque motor, which solves the problem that a limited angle brushless direct current torque motor cannot be normally reset due to damage and failure of a volute spiral spring, and comprises a reset stator and a reset rotor; the reset stator comprises a reset machine base, at least two reset magnetic steel bases and at least two reset stator magnetic steels; the reset machine seat is provided with at least two U-shaped grooves on the end surface of an annular seat body; the reset magnetic steel seat is fixed on the reset base, and a reset stator magnetic steel is fixed on each seat body; the reset rotor comprises a reset rotor bracket and at least one pair of reset rotor magnetic steels; the reset rotor magnetic steel is oppositely arranged on the outer wall of the reset rotor bracket; and is opposite to the reset stator magnetic steel. Through permanent magnet structure resetting, realize limited corner torque motor's quick reset, the structure is simpler, does not have the risk of volute spiral spring fracture inefficacy, can adapt to complicated environmental condition, and the reliability obviously improves.)

1. A self-resetting limited angle torque motor comprises a shell (4), an end cover (2), a motor shaft (1), a motor stator (6) and a motor rotor (5);

the end covers (2) are buckled at two ends of the shell (4) to form a sealed shell; the motor shaft (1) penetrates out along the axial center of the sealing shell;

the motor stator (6) and the motor rotor (5) are both positioned in the sealed shell, the motor stator (6) is installed on the machine shell (4), and the motor rotor (5) is fixed on the motor shaft (1);

the method is characterized in that:

the device also comprises a reset stator (09) and a reset rotor (08);

the reset stator (09) and the reset rotor (08) are both positioned outside the sealed shell;

the reset stator (09) comprises a reset machine base (10), at least two reset magnetic steel bases (11) and at least two reset stator magnetic steels (12); the reset machine base (10) is an annular base body fixed on the end cover, and the end surface of the annular base body is parallel to the plane of the end cover (2); at least two U-shaped grooves are formed along the end face of the annular seat body; the reset magnetic steel seat (11) comprises a seat body and fixed arms which are integrally arranged with the seat body, the fixed arms are inserted into the U-shaped grooves, and reset stator magnetic steel (12) is fixed on the seat body;

the reset rotor (08) comprises a reset rotor bracket (13) and at least one pair of reset rotor magnetic steels (14); the reset rotor bracket (13) is annular and is sleeved and fixed on the output end of the motor shaft; the reset rotor magnetic steel (14) is oppositely arranged on the outer wall of the reset rotor bracket (13); and is opposite to the reset stator magnetic steel (12); a gap is arranged between the reset stator magnetic steel (12) and the reset rotor magnetic steel (14), and the polarities of the reset stator magnetic steel and the reset rotor magnetic steel are opposite.

2. The self-resetting limited angle torque motor of claim 1, wherein: the length of the U-shaped groove is greater than the width of the fixing arm; so that the position of the fixing arm in the U-shaped groove can be adjusted.

3. The self-resetting limited angle torque motor of claim 2, wherein: the two U-shaped grooves are symmetrical about the center of the reset machine base (10).

4. The self-resetting limited angle torque motor of claim 3, wherein: the reset machine base (10) and the reset rotor bracket (13) are coaxial with the motor shaft.

5. The self-resetting limited angle torque motor of claim 4, wherein: the reset rotor bracket (13) is arranged at the output end of the motor shaft through a key groove structure.

6. The self-resetting limited angle torque motor of claim 5, wherein: the reset rotor magnetic steel (14) is fixed on the outer wall of the reset rotor bracket (13) through bonding.

Technical Field

The invention belongs to the field of motors, and particularly relates to a self-resetting limited corner torque motor.

Background

The limited corner torque motor is a servo motor which can directly drive a load to make quick movement and accurate positioning within a certain angle range. Compared with the common brush direct current motor with the electric brush and the commutator, the structure is simpler, the reliability is high, and the phenomenon that the electric brush violently jumps due to frequent reciprocating swing does not exist. The servo drive mechanism is particularly suitable for servo drive occasions which only do reciprocating swing, and has small volume, high precision, long service life and high reliability.

The limited angle torque motor mostly adopts a scroll spring for mechanical reset. The structure of the motor is shown in figure 1, and the motor mainly comprises a motor shaft 1, an end cover 2, a bearing 3, a machine shell 4, a motor rotor 5, a motor stator 6, a motor controller 7, a volute spiral spring 8 and a spring seat 9. Under complicated environmental conditions, a decarburized layer may appear on the surface of the spiral spring, which causes the surface hardness and strength of the spiral spring to be sharply reduced and is difficult to withstand the periodic impact load. Meanwhile, the decarburized layer induces internal cracks, so that the internal stress of the volute spiral spring is overlarge under the working condition, the volute spiral spring is broken and fails early, and the limited-angle torque motor cannot be reset normally.

Disclosure of Invention

The invention aims to provide a self-resetting limited-angle brushless direct current torque motor, which solves the problem that the limited-angle brushless direct current torque motor cannot be normally reset due to damage and failure of a volute spiral spring.

The invention provides a self-resetting limited-angle brushless direct current torque motor, which comprises a shell, an end cover, a motor shaft, a motor stator and a motor rotor, wherein the end cover is arranged on the shell;

the end covers are buckled at two ends of the shell to form a sealed shell; the motor shaft penetrates out along the axial center of the sealing shell;

the motor stator and the motor rotor are both positioned in the sealed shell, the motor stator is arranged on the shell, and the motor rotor is fixed on a motor shaft;

it is characterized in that:

the device also comprises a reset stator and a reset rotor;

the reset stator and the reset rotor are both positioned outside the sealed shell;

the reset stator comprises a reset base, at least two reset magnetic steel bases and at least two reset stator magnetic steels; the reset machine base is an annular base body fixed on the end cover, and the end surface of the reset machine base is parallel to the plane of the end cover; at least two U-shaped grooves are formed along the end face of the annular seat body; the reset magnetic steel seat comprises a seat body and fixed arms which are integrally arranged with the seat body, the fixed arms are inserted into the U-shaped grooves, and the seat body is respectively fixed with a reset stator magnetic steel;

the reset rotor comprises a reset rotor bracket and at least one pair of reset rotor magnetic steels; the reset rotor bracket is annular and is sleeved and fixed on the output end of the motor shaft; the reset rotor magnetic steel is oppositely arranged on the outer wall of the reset rotor bracket; and is opposite to the reset stator magnetic steel; a gap is arranged between the reset stator magnetic steel and the reset rotor magnetic steel, and the polarities of the reset stator magnetic steel and the reset rotor magnetic steel are opposite.

Furthermore, in order to adjust the rotation angle range of the motor, the length of the U-shaped groove is larger than the width of the fixing arm; so that the position of the fixing arm in the U-shaped groove can be adjusted.

Further, the two U-shaped grooves are symmetrical about the center of the reset machine base.

Furthermore, the reset machine base and the reset rotor bracket are coaxial with the motor shaft.

Further, the reset rotor bracket is mounted on the output end of the motor shaft through a key groove structure.

Furthermore, the reset rotor magnetic steel is fixed on the outer wall of the reset rotor bracket through bonding.

The invention has the beneficial effects that:

1. compared with the traditional limited-angle torque motor with the reset mechanical spring, the reset mechanical spring has the advantages that the reset mechanical spring is reset through the permanent magnet structure, the rapid reset of the limited-angle torque motor is realized, the structure is simpler, the risk of fracture and failure of the volute spiral spring is avoided, the complex environmental conditions can be adapted, and the reliability is obviously improved.

2. The invention can also adjust the position of the reset stator magnetic steel through the U-shaped groove on the reset base, thereby adjusting the reset torque of the permanent magnet structure, and the operation is more convenient. Meanwhile, the rotation angle range of the motor can be adjusted by adjusting the position of the reset stator magnetic steel, and the performance requirements of motors with different rotation angle ranges can be met.

Drawings

FIG. 1 is a schematic structural view of a conventional limited angle torque motor mechanically restored by a spiral spring;

the reference numerals in fig. 1 are: 1-motor shaft, 2-end cover, 3-bearing, 4-machine shell, 5-motor rotor, 6-motor stator, 7-motor controller, 8-volute spring and 9-spring seat;

FIG. 2 is a schematic view of a wrap spring;

FIG. 3 is a schematic structural diagram of a limited-angle torque motor employing a permanent magnet reset structure according to an embodiment of the present invention;

the reference numerals in fig. 3 are: 1-motor shaft, 2-end cover, 3-bearing, 4-machine shell, 5-motor rotor, 6-motor stator, 7-motor controller, 08-reset rotor and 09-reset stator;

fig. 4a is a schematic front view of a permanent magnet reset configuration;

fig. 4b is a cross-sectional view of a permanent magnet reset structure:

the reference numerals in fig. 4a and 4b are: 10-a reset machine base, 11-a reset magnetic steel base, 12-reset stator magnetic steel, 13-a reset rotor bracket, 14-reset rotor magnetic steel and 15-a fastening nut;

fig. 5a is a schematic position diagram of the permanent magnet resetting structure when the motor is in a driving working state;

fig. 5b is a schematic position diagram of the permanent magnet reset structure when the motor is in a reset working state.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

As can be seen from fig. 3, the limited angle torque motor of the present embodiment is composed of a motor shaft 1, an end cover 2, a bearing 3, a housing 4, a motor rotor 5, a motor stator 6, a motor controller 7, a reset rotor 8, and a reset stator 9. The end covers 2 are buckled at two ends of the machine shell 4 to form a closed shell. Two end covers 2 are provided with bearing holes in the center of the side wall in the closed shell, and the bearing 3 is fixed in the bearing holes. The motor shaft 1 passes through the center of the closed shell, and the two ends of the motor shaft located inside the closed shell are respectively supported by bearings 3. The motor rotor 5 and the motor stator 6 are both positioned inside the closed shell, wherein the motor stator 6 is fixed on the machine shell 4, and the electronic rotor 5 is installed on the motor shaft and is fixed through a locking nut.

Meanwhile, as can be seen from fig. 3, the permanent magnet reset structures formed by the reset rotor 08 and the reset stator 09 are both located outside the sealed housing and are both located at the output end of the motor shaft 1.

Referring to fig. 4a and 4b, the reset stator 09 of the present embodiment is composed of a reset machine base 10, a reset magnetic steel base 11, and a reset stator magnetic steel 12. The reset machine base 10 is an annular base body, and two U-shaped grooves are formed in the end face of the annular base body and are centrosymmetric with respect to the annular base body. The reset magnetic steel seat 11 is installed on the reset machine base and specifically comprises a seat body and a fixed arm, and the fixed arm is inserted into the U-shaped groove to fix the reset magnetic steel seat 11. The reset stator magnetic steel 12 is bonded on the reset magnetic steel seat, and the reset magnetic steel seat 11 can be adjusted in position through a U-shaped groove on the reset machine seat. In other embodiments, a plurality of pairs of reset stator magnetic steels may be arranged according to the rotation angle range, that is, a plurality of pairs of U-shaped grooves may be formed in the reset machine base 10, and one reset stator magnetic steel is fixed in each U-shaped groove through the reset magnetic steel base 11.

The reset rotor 08 is composed of a reset rotor bracket 13 and a reset rotor magnetic steel 14. The rotor support that resets is cyclic annular, through keyway structural mounting on the motor shaft, and the rotor magnet steel that resets bonds on the rotor support that resets to relative with stator magnet steel 12 that resets, the polarity of stator magnet steel that resets and the rotor magnet steel that resets is opposite, and the stator magnet steel that resets has the clearance with the rotor magnet steel that resets between the two, and the clearance ensures that the rotor that resets can rotate at the certain limit, with the required electromagnetism counter-force that resets of constitution.

The motor of the embodiment can work in two working states, namely a driving working state and a resetting working state.

In a driving working state, the motor stator is electrified, and the motor rotor drives the motor shaft to rotate. As shown in fig. 5a, the reset stator and the reset rotor increase the reset torque as the angle changes.

And in the reset working state, the motor stator is powered off. As shown in fig. 5b, the reset torque drives the reset rotor to rotate, so as to drive the motor shaft to rotate, thereby realizing reset.