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CN-115441613-B - Limited corner torque motor structure

CN115441613BCN 115441613 BCN115441613 BCN 115441613BCN-115441613-B

Abstract

The invention provides a limited-angle torque motor structure, which mainly solves the technical problems that the electromagnetic torque of the limited-angle torque motor is reduced along with the increase of the rotor angle position due to the existence of armature reaction, so that the electromagnetic torque fluctuation of the limited-angle torque motor is increased, and the low electromagnetic torque fluctuation requirement of an electric servo system cannot be met. The stator comprises a shell, a stator core and N windings, wherein the stator core is coaxially arranged in the shell, the N windings are uniformly wound on the stator core along the circumferential direction, the winding directions of two adjacent windings are opposite, the rotor comprises an inner magnetic ring, M axial magnetic increasing assemblies and N main driving magnetic steels which are respectively and correspondingly arranged with the N windings, the N main driving magnetic steels are uniformly connected to the inner magnetic ring along the circumferential direction, and the M axial magnetic increasing assemblies are respectively arranged in the interval and are connected to the outer circumferential surface of the inner magnetic ring.

Inventors

  • LI YUTAO
  • LI JIXING
  • SUN SHIJIE
  • CAO KUAN

Assignees

  • 西安航天精密机电研究所
  • 西安航天精密机电研究所

Dates

Publication Date
20260421
Application Date
20220830
Priority Date
20220830

Claims (8)

  1. 1. The limited angle moment motor structure is characterized by comprising a stator (1) and a rotor (2); The stator (1) comprises a shell (11), a stator core (12) and N windings (13), wherein N is an integer multiple of 2; The stator iron core (12) is coaxially arranged in the shell (11), N windings (13) are uniformly wound on the stator iron core (12) along the circumferential direction, the winding directions of two adjacent windings (13) are opposite, and gaps are formed along the circumferential direction; The rotor (2) comprises an inner magnetic conduction ring (21), M axial magnetism increasing assemblies (23) and N main driving magnetic steels (22) which are respectively and correspondingly arranged with N windings (13), wherein M is more than or equal to 1 and less than or equal to N; N pieces of main driving magnetic steel (22) are uniformly connected to the inner magnetic conducting ring (21) along the circumferential direction, the outer side surface of the main driving magnetic steel (22) is in clearance fit with the winding (13), and the radial symmetrical axis of the main driving magnetic steel (22) coincides with the radial symmetrical axis of the corresponding winding (13) in the zero position; M axial magnetism increasing assemblies (23) are respectively arranged in the intervals and are connected to the outer peripheral surface of the inner magnetic conducting ring (21); the axial magnetism increasing assembly (23) comprises an auxiliary magnetic shoe (231) axially arranged and two auxiliary magnetic steels (232) axially symmetrically arranged at two sides of the winding (13); The auxiliary magnetic shoes (231) are connected to the inner magnetic conducting rings (21), one ends of the two auxiliary magnetic steels (232) are oppositely connected to two ends of the auxiliary magnetic shoes (231), and the other ends of the two auxiliary magnetic steels (232) are in clearance fit with the windings (13).
  2. 2. A limited angle torque motor structure in accordance with claim 1, wherein: The auxiliary magnetic steel (232) is provided with an angle beta between the rotation direction of the auxiliary magnetic steel and the radial symmetrical axis of the adjacent main driving magnetic steel (22) in the zero position, the range of beta is (0.65-0.85) x 180/N, and the angle beta is used for regulating and controlling the magnetizing torque of the axial magnetizing assembly (23) in the limit position of the rotor (2).
  3. 3. A limited angle torque motor structure in accordance with claim 2, wherein: The pole arc angle theta of the auxiliary magnetic steel (232) is (0.1-0.2) 180/N, the radius R1 of the inner peripheral surface is [ R01+ (1-3) ] mm, the radius R2 of the outer peripheral surface is [ R02- (1-3) ] mm, the axial thickness b is 1.5 mm-3 mm, R01 is the inner diameter of the stator core (12), and R02 is the outer diameter of the stator core (12).
  4. 4. A limited angle torque motor structure according to claim 2 or 3, wherein: The auxiliary magnetic shoe (231) is of a U-shaped structure and comprises a first sub magnetic shoe arranged along the axial direction and two second sub magnetic shoes arranged along the radial direction; The middle part of the first sub magnetic shoe is connected to the inner magnetic conducting ring (21), one ends of the two second sub magnetic shoes are oppositely connected to two ends of the first sub magnetic shoe, and the two auxiliary magnetic steels (232) are oppositely connected to one sides of the other ends of the two second sub magnetic shoes, which are close to each other.
  5. 5. A limited angle torque motor structure in accordance with claim 4, wherein: The outer peripheral surface of the inner magnetic conduction ring (21) is provided with a mounting groove corresponding to the first sub-magnetic shoe, and the first sub-magnetic shoe is connected in the mounting groove.
  6. 6. A limited angle torque motor structure in accordance with claim 5, wherein: The main driving magnetic steel (22) and the inner magnetic conducting ring (21), the first sub magnetic shoes and the inner magnetic conducting ring (21) and the auxiliary magnetic steel (232) and the second sub magnetic shoes are all connected through gluing.
  7. 7. A limited angle torque motor structure in accordance with claim 6, wherein: The auxiliary magnetic shoes (231), the stator iron core (12) and the inner magnetic conducting ring (21) are made of soft magnetic materials, and the main driving magnetic steel (22) and the auxiliary magnetic steel (232) are made of hard magnetic materials.
  8. 8. The limited angle torque motor structure of claim 7, wherein said m=n=4.

Description

Limited corner torque motor structure Technical Field The invention relates to a motor structure, in particular to a limited-rotation-angle torque motor structure. Background The limited corner torque motor is used as a special servo motor, can directly drive a load to perform quick motion and accurate positioning within a certain angle range, and is widely applied to various high-precision electric servo systems for military use and civil use due to the characteristics of simple structure, no cogging torque, low cost and the like. As shown in fig. 1, in the prior art, a rotor of a limited-angle torque motor is generally uniformly mounted on an inner magnetic conductive ring 02 by using radially magnetized magnetic steel 01, and then the electromagnetic torque of the limited-angle torque motor is controlled by adjusting the pole arc angle of the magnetic steel 02. However, due to the existence of armature reaction, the electromagnetic torque of the existing limited-angle torque motor is reduced along with the increase of the rotor angle position, so that the electromagnetic torque fluctuation of the limited-angle torque motor is increased, and the low electromagnetic torque fluctuation requirement of an electric servo system cannot be met. Disclosure of Invention The invention aims to solve the technical problems that the electromagnetic torque fluctuation of the limited-angle torque motor is increased and the low electromagnetic torque fluctuation requirement of an electric servo system cannot be met due to the fact that the electromagnetic torque of the limited-angle torque motor is reduced along with the increase of the rotor angle position caused by the existence of armature reaction in the traditional limited-angle torque motor. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the motor structure with limited angular moment is characterized by comprising a stator and a rotor; the stator comprises a shell, a stator iron core and N windings, wherein N is an integer multiple of 2; The stator core is coaxially arranged in the shell, N windings are uniformly wound on the stator core along the circumferential direction, the winding directions of two adjacent windings are opposite, and gaps are formed along the circumferential direction; The rotor comprises an inner magnetic conduction ring, M axial magnetism increasing components and N main driving magnetic steels which are respectively and correspondingly arranged with N windings, wherein M is more than or equal to 1 and less than or equal to N; N pieces of main driving magnetic steel are uniformly connected to the inner magnetic conductive ring along the circumferential direction, the outer side faces of the main driving magnetic steel are in clearance fit with the windings, and the radial symmetrical axes of the main driving magnetic steel are coincident with the radial symmetrical axes of the corresponding windings in the zero position; The M axial magnetism increasing assemblies are respectively arranged in the intervals and connected to the outer peripheral surface of the inner magnetic conduction ring. Further, the axial magnetism increasing component comprises an auxiliary magnetic shoe arranged along the axial direction and two auxiliary magnetic steels symmetrically arranged at two sides of the winding along the axial direction; the auxiliary magnetic shoes are connected to the inner magnetic conductive rings, one ends of the two auxiliary magnetic steels are oppositely connected to two ends of the auxiliary magnetic shoes, and the other ends of the two auxiliary magnetic steels are in clearance fit with the windings. Further, through setting up the ampere position of axial magnetism subassembly, can regulate and control the magnetism increasing torque of axial magnetism subassembly under the limit corner condition of rotor, auxiliary magnet steel is provided with angle beta along its direction of rotation and adjacent between the main magnetic steel along radial symmetry axis when the zero position, and the scope of beta is (0.65 ~ 0.85) 180/N. Further, in order to further regulate and control the generation of the magnetizing torque of the axial magnetizing assembly at the limit position of the rotor, the size of the auxiliary magnetic steel is designed to meet the following parameters that the polar arc angle theta of the auxiliary magnetic steel is (0.1-0.2) 180/N, the radius R1 of the inner peripheral surface is (R01 + 1-3) mm, the radius R2 of the outer peripheral surface is (R02-1-3) mm, the axial thickness b is 1.5 mm-3 mm, R01 is the inner diameter of the stator core, and R02 is the outer diameter of the stator core. Further, the auxiliary magnetic shoe is of a U-shaped structure and comprises a first sub magnetic shoe arranged along the axial direction and two second sub magnetic shoes arranged along the radial direction; the middle part of the first sub magnetic boot is connected to the