CN104868694A - Outer-rotor electromagnetic brake - Google Patents

Abstract

Outer rotor electromagnetic brake. The invention relates to an outer rotor electromagnetic brake. Electromagnetic brakes are mostly contact brakes, that is, the braking torque is generated through the action of the friction disc, and the friction disc will wear out after long-term use, which will reduce the reliability of the system. The inner stator (3) is provided with an annular excitation coil (1) wound on an annular coil frame, the winding direction of the annular excitation coil (1) is perpendicular to the motor output shaft (4), The outer rotor (2) is set on the inner stator (3), the motor casing (5) is set on the outer rotor (2), and the outer rotor (2) is set on the output shaft of the motor ( 4), the left side of the motor casing (5), the left side of the inner stator (3), the left side of the outer rotor (2) and the motor output shaft (4) are all connected by screws (7) Attach rear end cap (6). The invention is used for an electromagnetic brake.

Description

Outer rotor electromagnetic brake

technical field

The invention relates to an outer rotor electromagnetic brake.

Background technique

With the development of the field of automatic control, many new brake structures have emerged. Most of their functions are to stop the moving parts in a short time when the servo system issues a stop command, such as disc brakes and disc brakes used in electric vehicles, electromagnetic structure brakes used when elevators stop, etc.; Most of the current electromagnetic brakes are contact brakes, that is, the braking torque is generated through the action of the friction disc, and the friction disc will definitely wear out after long-term use, which will reduce the reliability of the system.

Contents of the invention

The purpose of the present invention is to provide a non-contact type between the outer rotor and the inner stator, which avoids the effect of friction, and at the same time, the structure of the brake is an outer rotor structure, which has a larger braking rotation speed than the ordinary inner rotor structure. moment.

Above-mentioned purpose realizes by following technical scheme:

An outer rotor electromagnetic brake, which consists of: a ring-shaped excitation coil 1, an inner stator 3, an outer rotor 2, a bearing 4, and a rear cover shell 6. The outer wall of the inner stator 3 is provided with an annular groove. The inner surface of the annular groove is provided with an annular excitation coil 1 wound on an annular coil frame, the winding direction of the annular excitation coil 1 is perpendicular to the output shaft 4 of the motor, and the inner stator 3 An outer rotor 2 is arranged on the top, and one side of the outer rotor 2 is connected with the rear cover shell 6 through a bearing 4. The outer rotor 2 is arranged in the motor casing 5, and one part of the motor casing 5 The side is detachably connected with the rear cover shell 6, and the inner stator 3 is connected with the rear cover shell 6.

In the outer rotor electromagnetic brake, a plurality of cogs are evenly distributed on the inner circumferential surface of the stator 2 and the outer circumferential surface of the rotor 3, and the widths of the respective cogs of the stator 2 are equal. The widths of the tooth slots of the rotor 3 are also equal.

In the outer rotor electromagnetic brake, each inner stator 3 corresponds to each outer rotor 2 one by one.

Beneficial effect:

1. The brake of the present invention has an outer rotor structure, and compared with an inner rotor brake, the braking torque of the brake is larger.

2. The brake of the present invention does not use a friction disc component, and the braking principle is to use the reluctance torque generated by the cogging between the outer rotor and the inner stator, which greatly improves the reliability of the system.

3. The control mode of the brake of the present invention is simple, and the braking torque can be generated by feeding direct current into the winding, without using complicated control circuits.

Description of drawings:

Accompanying drawing 1 is a structural representation of the present invention.

Accompanying drawing 2 is the right view of accompanying drawing 1.

Accompanying drawing 3 is the left view of accompanying drawing 1.

Detailed ways:

Example 1

In conjunction with accompanying drawing 1, an outer rotor electromagnetic brake is composed of: an annular excitation coil 1, an inner stator 3, an outer rotor 2, a bearing 4, and a rear cover shell 6; There is an annular groove, the inner surface of the annular groove is provided with an annular excitation coil 1 wound on the annular coil frame, the winding direction of the annular excitation coil 1 is perpendicular to the motor output shaft 4, The inner stator 3 is provided with an outer rotor 2, one side of the outer rotor 2 is connected to the rear cover shell 6 through a bearing 4, the outer rotor 2 is arranged in the motor casing 5, and the One side of the motor casing 5 is detachably connected with the back cover shell 6 , and the inner stator 3 is connected with the back cover shell 6 . The outer rotor 2 is connected to the motor output shaft.

Example 2

In conjunction with accompanying drawings 1 and 2, for the outer rotor electromagnetic brake described in Embodiment 1, a plurality of tooth slots are evenly distributed on the inner circumferential surface of the stator 2 and the outer circumferential surface of the rotor 3, respectively. The width of each tooth slot of the stator 2 is equal, and the width of each tooth slot of the rotor 3 is also equal.

Example 3

In conjunction with accompanying drawings 1 and 2, the outer rotor electromagnetic brake described in Embodiment 1 has a one-to-one correspondence between each of the inner stators 3 and each of the outer rotors 2 .

Along the axial direction of the brake, the annular hollow structure in the axial middle section of the outer rotor and the inner stator is provided with an annular excitation coil, and the winding direction of the annular excitation coil is perpendicular to the axial direction. The number of slots must be the same. The number of slots designed for the brake in this paper is 16, and the number of slots in the circumferential direction of the outer rotor and inner stator can also be changed according to the design requirements; the energization mode of the annular excitation coil is DC; Both the sub and the toroidal winding coils are set coaxially.

The principle of the invention to generate the braking torque is to use the reluctance torque generated after the excitation coil is fed with direct current, and at the same time, the outer rotor and the inner stator are mechanically non-contact, which improves the efficiency and reliability of the system. The invention is applicable to various servo motor systems.

When the excitation coil of the brake is supplied with direct current, a magnetomotive force F _m is generated in the inner stator, and the magnetic line of force first passes through the inner stator yoke, inner stator teeth, working air gap, outer rotor teeth and outer rotor yoke on the other side of the brake. The stator and rotor teeth, yoke and other parts on the side form a closed loop. In the present invention, the number of teeth of the outer rotor and the inner stator of the brake is equal to 16 as an example, and the tooth width and the slot width are kept the same, and other numbers of teeth can also be designed to meet the requirements of different occasions for the torque range.

The working principle of the present invention: due to the existence of the cogging effect of the outer rotor and the inner stator, the change rate of the air gap permeability is not uniform, and the reluctance torque can be generated under the action of the magnetomotive force of the excitation coil, that is, the braking force of the brake torque.

Of course, the above descriptions are not intended to limit the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or replacements made by those skilled in the art within the scope of the present invention shall also belong to the present invention. protection scope of the invention.

Claims (3)

1. An outer rotor electromagnetic brake, which consists of: a ring-shaped excitation coil (1), an inner stator (3), an outer rotor (2), a bearing (4), and a rear cover shell (6), and is characterized in that: The outer wall of the inner stator (3) is provided with an annular groove, and the inner surface of the annular groove is provided with an annular excitation coil (1) wound on an annular coil frame, and the annular excitation coil ( 1) The winding direction is perpendicular to the motor output shaft (4), the inner stator (3) is provided with an outer rotor (2), and one side of the outer rotor (2) passes through the bearing (4 ) is connected with the rear cover (6), the outer rotor (2) is set in the motor casing (5), and one side of the motor casing (5) is detachable from the rear cover (6) Connection, the inner stator (3) is connected with the rear cover shell (6). 2. The outer rotor electromagnetic brake according to claim 1, characterized in that: the inner peripheral surface of the stator (2) and the outer peripheral surface of the rotor (3) are respectively evenly distributed with a plurality of tooth slots , the width of each tooth slot of the stator (2) is equal, and the width of each tooth slot of the rotor (3) is also equal. 3. The outer rotor electromagnetic brake according to claim 1, characterized in that: each of the inner stators (3) corresponds to each of the outer rotors (2).