CN112421922A

CN112421922A - Limited-angle motor

Info

Publication number: CN112421922A
Application number: CN202011422808.0A
Authority: CN
Inventors: 杨小青; 王永嘉; 王佳
Original assignee: Shaanxi Aerospace Times Navigation Equipment Co ltd
Current assignee: Shaanxi Aerospace Times Navigation Equipment Co ltd
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2021-02-26

Abstract

The invention discloses a limited angle motor, comprising a shell, a stator component fixed on the shell, a rotor component capable of rotating in the shell, a coil component capable of generating a magnetic field along the axial direction of a rotor, a slip ring fixed on the rotor component and an electric brush fixed on the shell, wherein the stator component comprises an end cover and a stop block, the rotor component comprises a rotating shaft and a magnetic pole, a pair of first inclined planes are arranged on the end surface of one end of the end cover opposite to the magnetic pole, the first inclined planes are circumferentially and uniformly distributed on the end cover in 180 degrees, the stop block is arranged at the transition position of the first inclined planes, two side surfaces of the stop block opposite to the first inclined planes are obliquely arranged, a pair of bosses circumferentially and uniformly distributed in 180 degrees are arranged on the magnetic pole, the end surface of each boss opposite to the end cover is provided with a second inclined plane which is matched with and is not contacted with the first inclined planes, two ends of each boss are provided with inclined planes respectively matched with two side surfaces of the stop block.

Description

Limited-angle motor

Technical Field

The invention relates to a motor, in particular to the technical field of limited-angle motors

Background

The traditional limited angle motor is composed of a direct current torque motor and a position indication part, the motor part is composed of a stator, a rotor and an electric brush, the stator part comprises magnetic steel, the rotor part is composed of a magnetic pole with a groove and a winding, the electric brush is composed of a brush holder, an electric brush head and a spring piece, the structure is complex, the production cost is high, and under the condition of long-time vibration, the output signal of the motor can not accurately reflect the working state of the motor.

The applicant patented a limited angle motor (201811471692.2) for an electromechanical igniter in 18 years, and disclosed a technical scheme in which an end cover of the limited angle motor and a rotor iron wire rotate a rotating shaft through opposite helical surface suction under axial magnetic force generated by a coil, and a rotor angle limit is blocked by a stop block. Because the rotor is closer to the stop block from the starting to the stopping process in an accelerating state, the kinetic energy is larger, and the contact surface between the traditional stop block and the boss is a plane, so that larger elastic force can be generated, the output signal is fluctuated, and the accuracy of position indication is influenced.

Disclosure of Invention

In order to solve the deficiency in the prior art, provide a kind of elasticity that reduces the rotor and dog and produces after colliding each other, the limited corner motor that the output signal of position indication will not fluctuate, the technical scheme adopted in the invention is:

a limited angle motor comprises a shell, a stator assembly is fixed on the shell, a rotor assembly capable of rotating is arranged in the shell, a coil assembly capable of generating a magnetic field along the axial direction of a rotor is further arranged in the shell, a slip ring fixed on the rotor assembly and an electric brush fixed on the shell are further included, the stator assembly comprises an end cover and a stop block, the rotor assembly comprises a rotating shaft and a magnetic pole, a pair of first inclined planes are arranged on the end face of one end, opposite to the magnetic pole, of the end cover, the first inclined planes are uniformly distributed on the end cover in a 180-degree circumference mode, the stop block is arranged at the transition position of the first inclined planes, two opposite side faces of the stop block and the first inclined planes are obliquely arranged, a pair of bosses uniformly distributed in a 180-degree circumference mode are arranged on the magnetic pole, and a second inclined plane which is matched with the first inclined planes and is not in contact with the end face, opposite to, the pair of bosses are arranged at intervals, and two ends of each boss are provided with inclined planes respectively matched with two side surfaces of the stop block.

Furthermore, a return spring connected with the rotating shaft is arranged on the shell.

Furthermore, a pair of stop blocks is uniformly distributed on the circumference of the end cover for 180 degrees.

The limited-angle motor adopting the structure has the advantages that the contact surfaces of the boss and the stop block on the rotor are inclined planes, and the elastic force generated in the touch process is resolved to the axial direction, so that the circumferential elastic force is reduced, the elastic force generated after the rotor and the stop block collide with each other is reduced, and the position indication output signal cannot fluctuate.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a stator assembly of the present invention;

fig. 3 is a schematic view of a magnetic pole structure of the present invention.

Detailed Description

The limited angle motor shown in fig. 1 includes a housing 1, a stator assembly, a rotor assembly, a slip ring 3, a coil assembly 2, a slip ring 3 and an electric brush 4, the stator assembly is fixed at one end of the housing 1, the rotor assembly is movably arranged in the housing 1 and can rotate, a bearing 14 is arranged between the rotor assembly and the stator assembly and between the rotor assembly and the housing 1, the coil assembly 2 is arranged in the housing 1, the slip ring 3 is fixed on the rotor assembly, the electric brush 4 is fixed on the housing 1, the coil assembly 2 generates a magnetic field along the axial direction of the rotor assembly in the housing 1 after being powered, the magnetic field enables a suction force to be generated between the rotor assembly and the stator assembly, the stator assembly shown in fig. 2 includes an end cover 5 and a stop block 6, the end cover 5 is provided with a pair of first inclined planes 9, the pair of first inclined planes 9 are uniformly distributed on the end cover 5 in a 180 ° circumference, the stop block 6 is arranged The rotor assembly shown in fig. 3 includes a rotating shaft 7 and a magnetic pole 8, the magnetic pole 8 is provided with a pair of bosses 10 uniformly distributed in 180 ° circumference, the pair of bosses 10 are arranged at intervals, the end face of each boss 10 opposite to the end cover 5 is provided with a second inclined surface 11, the first inclined surface 9 and the second inclined surface 11 are mutually matched and always keep spacing and are both spirally raised, the stop block 6 is always arranged at the gap between the two bosses 10 during operation, the rotor stops rotating when the stop block 6 stops the two end positions of the bosses 10, when the coil assembly 2 is electrified to generate an axial magnetic field, an attraction force is generated between the first inclined surface 9 and the second inclined surface 11, the magnetic pole 8 is driven to rotate to gradually reduce the gap between the first inclined surface 9 and the second inclined surface 11 until the stop block 6 stops the end face rotation of the magnetic pole 8, because the rotor assembly is an accelerating process from the rotation to the stop, the magnetic pole 8 touches the stop block 6 quickly, produce the too big signal output of resilience force and take place to stir when avoiding plane striking, set up backstop 6 and two equal slopes of two sides that first inclined plane is relative (being the backstop go up with the magnetic pole both ends and touch the position slope setting), also set up the inclined plane 12 that matches with backstop 6 with boss 10 both ends (being the boss also the slope setting with the position that backstop block touched), rotatory terminal position to when the rotor subassembly, the inclined plane 12 of boss 10 tip touches with 6 sides of backstop that the same slope set up, decompose tangential direction's power to axial direction, reduce the resilience force, the signal has been avoided stirring.

On the basis of the structure, in order to enable the rotor to return to the initial position in the power-off state, the shell 1 is provided with the return spring 13, the return spring 13 is connected to the rotating shaft 7, and the rotor assembly is reset to the initial position through the elastic force of the return spring 13 under the condition that the rotor assembly is not influenced by the magnetic field force.

In the structure, a pair of stop blocks 6 are uniformly distributed at 180 degrees on the periphery of the end cover 5 for ensuring the reliability and stability of the stop blocks.

Claims

1. The utility model provides a limited angle motor, includes casing (1), be fixed with stator module on casing (1), be equipped with the rotor subassembly that can rotate in casing (1), still be equipped with coil pack (2) that can produce along rotor axial direction magnetic field in casing (1), still including slip ring (3) of fixing on the rotor subassembly and brush (4) of fixing on casing (1), its characterized in that: the stator assembly comprises an end cover (5) and a stop block (6), the rotor assembly comprises a rotating shaft (7) and a magnetic pole (8), a pair of first inclined planes (9) are arranged on the end surface of one end of the end cover (5) opposite to the magnetic pole, the pair of first inclined planes (9) are uniformly distributed on the end cover (5) in a 180-degree circumference, the stop block (6) is arranged at the transition position of the pair of first inclined surfaces (9), two opposite side surfaces of the stop block (6) and the pair of first inclined surfaces (9) are obliquely arranged, a pair of bosses (10) which are uniformly distributed in a 180-degree circumference are arranged on the magnetic pole (8), a second inclined plane (11) which is matched with the first inclined plane (9) and is not contacted with the first inclined plane is arranged on the end surface of each boss (10) opposite to the end cover (5), the pair of bosses (10) are arranged at intervals, and inclined surfaces (12) matched with two side surfaces of the stop block (6) are arranged at two ends of each boss (10).

2. The limited angle electric motor of a rotating curved surface electromagnet as claimed in claim 1, wherein: the shell (1) is provided with a return spring (13) connected with the rotating shaft (7).

3. A rotating surface electromagnet limited angle electric machine according to claim 1 or 2, characterized in that: and a pair of stop blocks (6) is uniformly distributed on the circumferential direction of the end cover (5) for 180 degrees.