US-20260128658-A1 - ELECTROMAGNETIC BRAKE

US20260128658A1US 20260128658 A1US20260128658 A1US 20260128658A1US-20260128658-A1

Abstract

An electromagnetic brake includes a stator and a rotor. The first bottom is connected between one side of the outer ring portion and one side of the inner ring portion. The first ring concave is formed by the outer ring portion, the inner ring portion and the first bottom. The two coils are disposed within the first ring concave. The friction portion is disposed on one side of the outer casing away from the first bottom. The permanent magnet is disposed around the inner friction element, and disposed between the inner friction element and the outer friction element. The rotor is pivotally connected with the stator and includes an armature. The armature is disposed on one side of the friction portion away from the outer casing. The friction portion and the permanent magnet are disposed between the armature and the outer casing.

Inventors

Yen-Hung Chen
Chia-Chi Lin
Yu-Wei Hsu
Cheng-Hsun Tsai
Cheng-Hang Hou
Pao-Feng Lai

Assignees

DELTA ELECTRONICS, INC.

Dates

Publication Date: 20260507
Application Date: 20250225
Priority Date: 20241104

Claims (13)

1 . An electromagnetic brake, comprising: a stator, comprising: an outer casing comprising an outer ring portion, an inner ring portion, a first bottom and a first ring concave, wherein the outer ring portion is disposed around the inner ring portion, the first bottom is connected between one side of the outer ring portion and one side of the inner ring portion, and the first ring concave is formed by the outer ring portion, the inner ring portion and the first bottom collaboratively; two coils disposed within the first ring concave; a friction portion disposed on one side of the outer casing away from the first bottom and comprising an inner friction element and an outer friction element, wherein the outer friction element is disposed around the inner friction element; and a permanent magnet disposed around the inner friction element, and disposed between the inner friction element and the outer friction element; and a rotor pivotally connected with the stator and comprising: an armature disposed on one side of the friction portion away from the outer casing, wherein the friction portion and the permanent magnet are disposed between the armature and the outer casing.
2 . The electromagnetic brake according to claim 1 , wherein the two coils comprises a first coil and a second coil, a first impedance of the first coil is different to a second impedance of the second coil, the second coil is disposed between the first coil and the outer ring portion of the outer casing, and the first coil is disposed between the inner ring portion of the outer casing and the second coil.
3 . The electromagnetic brake according to claim 1 , wherein the rotor comprises a rotor hub, the rotor hub comprises a shaft, a platform and a plurality of first holes, the platform is disposed around an outer periphery of the shaft, and the plurality of first holes run through the platform and disposed around the shaft.
4 . The electromagnetic brake according to claim 3 , wherein the rotor comprises a plurality of springs, each of the plurality of springs is disposed between the platform of the rotor hub and the armature and comprises a plurality of second holes, and each of the plurality of second holes is aligned to corresponding one of the plurality of first holes.
5 . The electromagnetic brake according to claim 4 , wherein the armature comprises a first receiving portion and a plurality of third holes, the first receiving portion is disposed in the center of the armature for receiving the shaft of the rotor hub, the plurality of third holes are disposed around the first receiving portion, and each of the plurality of third holes is aligned to the corresponding one of the plurality of first holes and corresponding one of the plurality of second holes.
6 . The electromagnetic brake according to claim 5 , wherein the rotor comprises a plurality of first fixing elements, each of the plurality of first fixing elements is penetrated through the corresponding one of the plurality of first holes, the corresponding one of the plurality of second holes and the corresponding one of the plurality of third holes, so that the rotor hub, the plurality of springs and the armature are fixed together.
7 . The electromagnetic brake according to claim 1 , wherein the stator comprises an inner casing, the inner casing is disposed within the first ring concave of the outer casing and comprises a second bottom, an upper ring portion, a lower ring portion and a second ring concave, the second bottom is disposed around the inner ring portion of the outer casing, the upper ring portion is extended from one side of the second bottom toward the outer ring portion of the outer casing, the lower ring portion is extended from another side of the second bottom toward the outer ring portion of the outer casing, the second ring concave is formed by the second bottom, the upper ring portion and the lower ring portion collaboratively, an opening of the second ring concave is toward the outer ring portion of the outer casing, wherein the two coils are disposed within the second ring concave.
8 . The electromagnetic brake according to claim 7 , wherein the stator comprise a control element, the control element comprises a circuit board and a wire, wherein the circuit board is disposed within the first ring concave of the outer casing and disposed between the lower ring portion of the inner casing and the first bottom of the outer casing, the wire is connected with the circuit board, and at least portion of the wire is penetrated through the outer ring portion of the outer casing and disposed in the exterior of the outer casing.
9 . The electromagnetic brake according to claim 7 , wherein the electromagnetic brake comprises a brake control circuit disposed on the circuit board, wherein the brake control circuit comprises a RC delay circuit and a PWM circuit, and an operation sequence of the two coils are controlled through the RC delay circuit and the PWM circuit.
10 . The electromagnetic brake according to claim 1 , wherein the inner friction element comprises a second receiving portion and a plurality of fourth holes, the second receiving portion is disposed in the center of the inner friction element, and the plurality of fourth holes are disposed around the second receiving portion.
11 . The electromagnetic brake according to claim 10 , wherein the stator comprises a copper plate, the copper plate is disposed between the inner friction element of the frication portion and the inner ring portion of the outer casing, the copper plate comprises a third receiving portion and a plurality of fifth holes, the third receiving portion is disposed in the center of the copper plate, the third receiving portion is aligned to the second receiving portion and a first receiving portion of the armature, and each of the plurality of fifth holes is aligned to corresponding one of the plurality of fourth holes.
12 . The electromagnetic brake according to claim 11 , wherein the inner ring portion of the outer casing comprises a fourth receiving portion and a plurality of sixth holes, the fourth receiving portion is disposed in the center of the inner ring portion, the fourth receiving portion is aligned to the second receiving portion, the third receiving portion and the first receiving portion, the plurality of sixth holes are disposed around the fourth receiving portion, each of the plurality of sixth holes is aligned to corresponding one of the plurality of fifth holes and corresponding one of the plurality of fourth holes.
13 . The electromagnetic brake according to claim 12 , wherein the stator comprises a plurality of second fixing elements, each of the plurality of second fixing elements is penetrated through the corresponding one of the plurality of fourth holes, the corresponding one of the plurality of fifth holes and corresponding one of the plurality of sixth holes.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority to China Patent Application No. 202422680019.7 filed on Nov. 4, 2024, the entire contents of which are incorporated herein by reference for all purposes. FIELD OF THE INVENTION The present invention relates to a brake and more particularly to an electromagnetic brake. BACKGROUND OF THE INVENTION Nowadays, the electromagnetic brake is widely applied to the robotic arms and various types of motors. The electromagnetic brake is an essential component in Industry 4.0. The conventional electromagnetic brake only includes a single coil and a permanent magnet assembled with stamped and turned parts. With the requirement for miniaturization in the robotic arms and various types of the motors, the space for components disposed within the robotic arms and various types of the motors has compressed. Consequently, the electromagnetic brake has demand for reducing the volume and the diameter. In the restriction of the volume, the braking force produced by the electromagnetic brake is reduced. For enhancing the brake force of the electromagnetic brake, the voltage is enhanced when the electromagnetic brake is activated. When the electromagnetic brake is returned to the original location, the voltage is decreased to the original voltage. When the electromagnetic brake only includes a single coil, the external power supply is essential to control the voltage. Consequently, the number of the control device is increased, and the cost of the electromagnetic brake is increased. When the voltage is increased or decreased, the energy loss is increased. Therefore, there is a need of providing an electromagnetic brake to obviate the drawbacks encountered from the prior arts. SUMMARY OF THE INVENTION The present disclosure provides an electromagnetic brake. The electromagnetic brake of the present disclosure includes two coils disposed within the first ring concave of the outer casing. The power consumption of the electromagnetic brake is reduced according to the activating of the two coils in different sequence. Moreover, the friction portion of the electromagnetic brake of the present disclosure includes an inner friction element and the outer friction element. The permanent magnet is disposed around the inner friction element, and disposed between the inner friction element and the outer friction element. The friction portion and the permanent magnet are disposed between the armature and the outer casing. According to the above structure, the volume of the outer casing of the electromagnetic brake of the present disclosure is reduced. In accordance with an aspect of the present disclosure, there is provided an electromagnetic brake. The electromagnetic brake includes a stator and a rotor. The stator includes an outer casing, two coils, a friction portion and a permanent magnet. The outer casing includes an outer ring portion, an inner ring portion, a first bottom and a first ring concave. The outer ring portion is disposed around the inner ring portion. The first bottom is connected between one side of the outer ring portion and one side of the inner ring portion. The first ring concave is formed by the outer ring portion, the inner ring portion and the first bottom collaboratively. The two coils are disposed within the first ring concave. The friction portion is disposed on one side of the outer casing away from the first bottom and includes an inner friction element and an outer friction element. The outer friction element is disposed around the inner friction element. The permanent magnet is disposed around the inner friction element, and disposed between the inner friction element and the outer friction element. The rotor is pivotally connected with the stator and includes an armature. The armature is disposed on one side of the friction portion away from the outer casing. The friction portion and the permanent magnet are disposed between the armature and the outer casing. The above contents of the present invention will become more readily apparent to those ordinarily skilled in the art after reviewing the following detailed description and accompanying drawings, in which: BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view illustrating an electromagnetic brake of the present disclosure; FIG. 2 is a schematic view illustrating a stator and a rotor of the electromagnetic brake as shown in FIG. 1; FIG. 3 is a schematic cross-sectional view illustrating the electromagnetic brake as shown in FIG. 1; FIG. 4 is a schematic exploded view illustrating the electromagnetic brake as shown in FIG. 1; FIG. 5 is a schematic circuit diagram illustrating a brake control circuit controlling the electromagnetic brake as shown in FIG. 1; FIG. 6 shows operation sequence diagram of the brake control circuit as shown in FIG. 5; FIG. 7A is a side view illustrating the electromagnetic brake as shown in FIG. 1 when the electromagnetic is not activated; and FIG. 7B is a