Electromagnetic brake motor

Abstract

An electromagnetic brake motor, the rotor core (1) of which is formed by silicon steel sheet stacking, the upper core is embedded with several current guide bars (2), the two ends of the current guide bar are connected with the bus ring, the right end of the current guide bar is exposed from the core and is placed on the outer circle of the right bus ring, the annular magnetic yoke (9) is arranged between the right bus ring and the end surface of the core, the outer circle of the magnetic yoke is provided with a groove body accommodating the current guide bar, the right end surface of the magnetic yoke is provided with a recess accommodating the right bus ring; the disc-shaped armature is sleeved on the rotating shaft, the armature can only move axially on the rotating shaft, the inner side surface of the right end cover is connected with the friction ring, the armature is located between the magnetic yoke and the friction ring, the spring is arranged between the armature and the right end surface of the rotor, and the spring is sleeved on the rotating shaft. The beneficial effects are that the magnetic yoke is arranged on the rotor, the rotor has the function of suction disc, the energy for generating the magnetic attraction force comes from the rotor current, and no additional power consumption is generated; the armature and the friction ring are arranged in the machine shell, so that the volume of the brake motor can be reduced.

Description

Technical Field

[0001] This invention relates to an electromagnetic brake motor. Background Technology

[0002] A brake motor consists of a motor body and a braking device. When the motor stops running, it can bring the rotor to a complete stop within a very short time. The braking device includes an electromagnet, a brake, and a spring. The braking process is as follows: when the motor is energized, the electromagnet is simultaneously energized, attracting the spring and releasing the brake, thus freeing the rotor from restraint. When the motor is de-energized, the electromagnet is de-energized, releasing the spring, and the brake clamps the rotor shaft, bringing the rotor to a rapid stop. The electromagnet includes a chuck, an excitation coil, and an armature. The excitation coil generates a magnetic field on the chuck that attracts the armature.

[0003] Its shortcomings are that the suction cup consumes electrical energy during motor operation; in addition, the braking device of the brake motor is installed outside the motor body, which requires the installation of supporting components for the braking device; to prevent foreign objects from entering the braking device, the braking device needs to be equipped with a protective cover, which occupies a large space. Utility Model Content

[0004] To address the aforementioned problems, this invention proposes an electromagnetic brake motor that utilizes the magnetic field generated by the rotor's bus current to form a suction cup, thereby reducing energy consumption and minimizing the motor's size during operation.

[0005] The technical solution of the present invention is an electromagnetic brake motor, which includes a housing 7, a stator 6 fixedly inserted on the inner wall of the housing, a left end cover 5 and a right end cover 13 respectively connected to the left and right ends of the housing, the left and right ends of the rotor shaft 4 are supported in the left and right end covers by bearings, the iron core 1 of the rotor is formed by stacking silicon steel sheets, and a plurality of guide bars 2 are embedded in the outer circle of the iron core along the axial direction. The left end of the guide bar is connected to a left current collector ring 3, and the right end of the guide bar is connected to a right current collector ring 8. The characteristic is that the right end of the guide bar is exposed out of the iron core and rests on the outer circle of the right current collector ring. An annular magnetic yoke 9 is provided between the end face of the right current collector ring and the iron core. The outer diameter of the magnetic yoke is equal to the outer diameter of the iron core. The outer circle of the magnetic yoke is provided with a groove to accommodate the guide bar, and the right end face of the magnetic yoke is provided with a recess to accommodate the right current collector ring.

[0006] A disc-shaped armature 10 is fitted on the rotating shaft 4. The armature can only move axially on the rotating shaft. A friction ring 14 is connected to the inner side of the right end cover. The armature is located between the magnetic yoke 9 and the friction ring 14. A spring 12 is provided between the armature and the right end face of the rotor. The spring is fitted on the rotating shaft.

[0007] The present invention is characterized by having a magnetic yoke on the rotor, such as... Figure 3As shown, the right bus ring is located in the concave part of the yoke. The yoke and the armature form a magnetic circuit. The gap between the yoke and the armature can be set very small, which can greatly reduce the magnetic resistance of the magnetic circuit. When there is current in the right bus ring, the current will generate an induced magnetic field. The magnetic flux of the induced magnetic field is linked between the magnetic ring and the armature. The magnetic field strength is related to the current. When the current is constant, the smaller the magnetic resistance of the magnetic circuit, the greater the magnetic flux in the magnetic circuit, which can generate a magnetic attraction force that overcomes the elastic force of the spring and attracts the armature.

[0008] The beneficial effects are that by setting a magnetic yoke on the rotor, the rotor has the function of a suction cup, and the energy for generating magnetic attraction comes from the rotor current, without additional electrical energy consumption; the armature and friction ring are both set inside the housing, which can reduce the size of the brake motor. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the present invention.

[0010] Figure 2 for Figure 1 The AA sectional view shows that the housing and stator are not drawn.

[0011] Figure 3 for Figure 2 BB-direction sectional view.

[0012] The attached diagram is labeled as follows: 1-Iron core, 2-Guide bar, 3-Left manifold, 4-Shaft, 5-Left end cover, 6-Stator, 7-Housing, 8-Right manifold, 9-Magnetic yoke, 10-Armature, 11-Spline, 12-Spring, 13-Right end cover, 14-Friction ring, 15-Magnetic lines of force, 16-Air gap. Detailed Implementation

[0013] An electromagnetic brake motor includes a housing 7, a stator 6 fixedly inserted into the inner wall of the housing, a left end cover 5 and a right end cover 13 connected to the left and right ends of the housing respectively, a rotor shaft 4 supported by bearings in the left and right end covers respectively, a rotor core 1 formed by stacking silicon steel sheets, a plurality of guide bars 2 embedded axially on the outer circle of the core, a left current collector ring 3 connected to the left end of the guide bars, and a right current collector ring 8 connected to the right end of the guide bars, characterized in that the right end of the guide bars protrudes from the core and rests on the outer circle of the right current collector ring, an annular magnetic yoke 9 is provided between the end face of the right current collector ring and the core, the outer diameter of the magnetic yoke is equal to the outer diameter of the core, a groove for accommodating the guide bars is provided on the outer circle of the magnetic yoke, and a recess for accommodating the right current collector ring is provided on the right end face of the magnetic yoke;

[0014] A disc-shaped armature 10 is fitted on the rotating shaft 4. The armature can only move axially on the rotating shaft. A friction ring 14 is connected to the inner side of the right end cover. The armature is located between the magnetic yoke 9 and the friction ring 14. A spring 12 is provided between the armature and the right end face of the rotor. The spring is fitted on the rotating shaft.

[0015] The left busbar, guide bar, and right busbar are cast aluminum as a single unit. The guide bar and right busbar serve to fix the magnetic yoke.

[0016] The yoke and armature are made of cast steel or electrical pure iron. Cast steel is preferred because it has high magnetic permeability and high strength.

[0017] The friction ring can be attached to the right end cover or extend from the right end cover.

[0018] To ensure that the armature can only move axially on the shaft, the rotor and the armature are splined together, that is, a spline 11 is provided on the shaft and an internal spline is provided on the inner circle of the armature. Alternatively, a bar key can be provided between the armature and the shaft.

[0019] The braking process is as follows: when the stator is energized, it generates a rotating magnetic field, which generates current and magnetic field in the rotor's guide bars and left and right busbars. The magnetic yoke attracts the armature and compresses the spring, so the armature does not contact the friction ring. When the stator is de-energized, the magnetic field disappears, and the spring force causes the armature to contact the friction ring. The friction between them causes the rotor to stop rotating quickly.

[0020] When the rotor current is constant, the attractive force of the magnetic field is related to the magnetic reluctance of the magnetic circuit (the path of the magnetic field lines). The smaller the magnetic reluctance, the greater the magnetic force generated. The path of the magnetic field lines 15 of the right busbar is as follows: Figure 2 and Figure 3 As shown, magnetic lines of force 15 pass through air gap 16 and are linked to the yoke and armature. The yoke and armature are cast steel parts made of magnetically conductive material, which have high magnetic permeability and low magnetic resistance. However, the air gap between the yoke and the armature has high magnetic resistance. In order to reduce the magnetic resistance of the air gap, the length of the air gap should be small. Therefore, when the armature contacts the friction ring, the distance between the armature and the yoke is 0.1 to 0.5 mm, preferably 0.2 mm.

Claims

1. An electromagnetic brake motor, comprising a housing (7), a stator (6) fixedly inserted into the inner wall of the housing, a left end cover (5) and a right end cover (13) respectively connected to the left and right ends of the housing, the rotor shaft (4) being supported by bearings in the left and right end covers, the rotor core (1) being formed by stacking silicon steel sheets, and several guide bars (2) being embedded axially on the outer circle of the core, the left end of the guide bar being connected to a left busbar (3), and the right end of the guide bar being connected to a right busbar (8), characterized in that, The right end of the guide bar is exposed above the iron core and rests on the outer circle of the right bus ring. An annular magnetic yoke (9) is provided between the end face of the right bus ring and the iron core. The outer diameter of the magnetic yoke is equal to the outer diameter of the iron core. A groove for accommodating the guide bar is provided on the outer circle of the magnetic yoke. A recess for accommodating the right bus ring is provided on the right end face of the magnetic yoke. A disc-shaped armature (10) is fitted on the rotating shaft (4). The armature can only move axially on the rotating shaft. A friction ring (14) is connected to the inner side of the right end cover. The armature is located between the magnetic yoke (9) and the friction ring (14). A spring (12) is provided between the armature and the right end face of the rotor. The spring is fitted on the rotating shaft.

2. The electromagnetic brake motor according to claim 1, characterized in that, The yoke and armature are made of cast steel.

3. The electromagnetic brake motor according to claim 1, characterized in that, The rotor and armature are splined.

4. The electromagnetic brake motor according to any one of claims 1 to 3, characterized in that, When the armature contacts the friction ring, the distance between the armature and the magnetic yoke is 0.2 mm.

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