Brake motor

Abstract

A brake motor comprises a stator core, a stator winding and a rotor, a rotating shaft is fixedly arranged in the middle of the rotor, the two ends of the rotating shaft extend out of the rotor and are connected with the stator core through a support, and the rotating shaft and the support are rotationally connected through an oil bearing; a positioning boss is arranged in the middle of the support, a limiting groove is radially machined in the end face of the positioning boss, brake blocks are arranged at the positions, opposite to the positioning boss, of the two ends of the rotor, and limiting protrusions are formed and matched with the limiting groove. In a working state, the stator winding is electrified to form a magnetic field, and the rotor moves to a central position and rotates after being subjected to an electromagnetic force effect in the magnetic field; in a non-working state, the limiting protrusions are embedded into the limiting grooves to limit rotation of the rotor. According to the motor structure, the brake blocks are fixedly installed at the two ends of the rotor, the limiting protrusions are arranged on the brake blocks and matched with the limiting grooves in the support, in the non-working state, the rotor moves downwards through the gravity of the rotor, the limiting protrusions are embedded into the limiting grooves, the braking effect is achieved, the structure is simple, extra power is not needed, and practicability is high.

Description

Technical Field

[0001] The utility model relates to a brake motor. Background Art

[0002] An electric motor (commonly known as a "motor") is an electromagnetic device that converts or transmits electrical energy according to the law of electromagnetic induction. Electric motors are widely used in household appliances, the automotive industry, robotics, and other fields, such as washing machines, dehydrators, air fryers, wipers, outdoor robots, and other equipment. When the motor is powered off, the rotor of the motor will rotate for a while due to inertia before it stops completely. In many industries, if the motor is to stop immediately after power failure, a brake device is required. Existing motor brake structures mostly use additional power for control, which makes the overall structure complex and increases production costs. Utility Model Content

[0003] In view of the shortcomings existing in the above problems, the utility model provides a brake motor.

[0004] To achieve the above-mentioned purpose, the utility model provides a brake motor, comprising a stator core in an annular structure, a stator winding arranged inside the stator core, and a rotor arranged between the stator windings, wherein a rotating shaft is fixedly arranged in the middle of the rotor, and both ends of the rotating shaft extend out of the rotor and are connected to the stator core through a bracket, and the rotating shaft and the bracket are rotatably connected through an oil-containing bearing;

[0005] The middle part of the side facing the bracket axially extends to form a positioning boss, and a radial limiting groove is processed on the end surface of the positioning boss. Brake blocks are provided at the positions opposite to the positioning boss at both ends of the rotor, and a limiting protrusion is formed on one end of the brake block facing the positioning boss to match the limiting groove;

[0006] In the working state, the stator winding generates magnetic lines of force and forms a magnetic field after being energized. The rotor moves to the center position under the action of electromagnetic force in the magnetic field and forms electromagnetic torque to rotate; in the non-working state, the limiting protrusion is embedded in the limiting groove to limit the rotation of the rotor.

[0007] As a further improvement of the present invention, the brake block is in an annular structure, the limiting protrusions are evenly distributed along the circumferential direction of the brake block, and the cross-section of the limiting protrusions is triangular.

[0008] As a further improvement of the utility model, the bottom of the limiting protrusion has an arc transition.

[0009] As a further improvement of the utility model, a bearing accommodating groove is machined at the center of the positioning boss, and the oil-containing bearing is placed in the bearing accommodating groove.

[0010] As a further improvement of the present invention, the rotating shaft and the oil-containing bearing are clearance-fitted, and the rotating shaft can slide axially relative to the oil-containing bearing.

[0011] As a further improvement of the present invention, the bracket is connected and fixed to the stator core via a locking bolt assembly.

[0012] The beneficial effects of the utility model are:

[0013] The motor structure has brake blocks fixedly installed at both ends of the rotor. The brake blocks are provided with limiting protrusions that match the limiting grooves on the bracket. In the non-working state, the rotor moves downward using its own gravity, so that the limiting protrusions are embedded in the limiting grooves to form a braking effect, limiting the rotor from continuing to rotate. The structure is simple, no additional power is required, and it is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of a brake motor of the utility model;

[0015] Figure 2 It is the front view of the brake shoe 3;

[0016] Figure 3 for Figure 2 Bottom view of

[0017] Figure 4 for Figure 3 Middle AA section view;

[0018] Figure 5 This is the structural diagram of the brake motor in the non-working state.

[0019] In the figure: 1, rotating shaft; 2, rotor; 3, brake block; 31, limiting protrusion; 4, bracket; 41, positioning boss; 42, bearing receiving groove; 43, limiting groove; 5, stator winding; 6, stator core; 7, locking bolt assembly; 8, oil-containing bearing. DETAILED DESCRIPTION

[0020] like Figure 1 As shown, a brake motor described in the utility model comprises a stator core 6 in an annular structure, a stator winding 5 arranged inside the stator core 6, and a rotor 2 arranged between the stator windings 5. A rotating shaft 1 is fixedly arranged in the middle of the rotor 2. Both ends of the rotating shaft 1 extend out of the rotor 2 and are connected to the stator core 6 through a bracket 4. The bracket 4 is connected and fixed to the stator core 6 through a locking bolt assembly 7. The rotating shaft 1 and the bracket 4 are rotatably connected through an oil-containing bearing 8. There is a clearance fit between the rotating shaft 1 and the oil-containing bearing 8, and the rotating shaft 1 can slide axially relative to the oil-containing bearing 8.

[0021] The middle part of the side facing the bracket 4 axially extends to form a positioning boss 41, and a radial limiting groove 43 is processed on the end surface of the positioning boss 41. Brake blocks 3 are provided at the positions opposite to the positioning boss 41 at both ends of the rotor 2. A limiting protrusion 31 is formed at one end of the brake block 3 facing the positioning boss 41 to match the limiting groove 43. The brake block 3 has an annular structure, and the limiting protrusions 31 are evenly distributed along the circumferential direction of the brake block 3. The cross-section of the limiting protrusion 31 is triangular, and the bottom of the limiting protrusion 31 is a circular arc transition (see Figure 2 , Figure 3 , Figure 4 ), a bearing receiving groove 42 is formed at the center of the positioning boss 41, and the oil-containing bearing 8 is placed in the bearing receiving groove 42;

[0022] In the working state, the stator winding 5 generates magnetic lines of force and forms a magnetic field after being energized. The rotor 2 moves to the center position under the action of the electromagnetic force in the magnetic field and forms an electromagnetic torque to rotate; in the non-working state, the limiting protrusion 31 is embedded in the limiting groove 43 to limit the rotation of the rotor 2.

[0023] The motor structure has brake blocks fixedly installed at both ends of the rotor. The brake blocks are provided with limiting protrusions that match the limiting grooves on the bracket. In the non-working state, the rotor moves downward using its own gravity, so that the limiting protrusions are embedded in the limiting grooves to form a braking effect, limiting the rotor from continuing to rotate. The structure is simple, no additional power is required, and it is highly practical.

[0024] In order to facilitate the understanding of the present invention, the following description is given in conjunction with the accompanying drawings during specific use;

[0025] The brake motor in this embodiment is mainly used in small household appliances, such as air fryers. The brake motor is installed with the shaft arranged vertically. When working, the stator winding is energized, generating magnetic lines and forming a magnetic field. After the rotor is acted upon by the electromagnetic force in the magnetic field, it automatically moves to the center position, and relative sliding is formed between the shaft and the oil-containing bearing. The brake blocks at both ends of the rotor are disconnected from the limit grooves on the positioning boss, and the rotor forms an electromagnetic torque and rotates under the action of the electromagnetic force. In the non-working state, the rotor loses the force of the magnetic field and moves downward under the action of its own gravity until the limit protrusion of the brake block is embedded in the limit groove on the corresponding positioning boss to form a braking effect (see Figure 5 ), limit the rotation of the rotor; brake blocks are provided at both ends of the rotor, and braking can be performed regardless of whether the brake motor is installed forward or inverted.

[0026] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A brake motor, characterized in that: The invention comprises a stator core (6) having an annular structure, a stator winding (5) arranged inside the stator core (6), and a rotor (2) arranged between the stator windings (5); a rotating shaft (1) is fixedly arranged in the middle of the rotor (2); two ends of the rotating shaft (1) extend out of the rotor (2) and are connected to the stator core (6) via a bracket (4); the rotating shaft (1) and the bracket (4) are rotatably connected via an oil-containing bearing (8); A positioning boss (41) is axially extended in the middle of one side facing the bracket (4), a limiting groove (43) is radially processed on the end surface of the positioning boss (41), brake blocks (3) are provided at positions opposite to the positioning boss (41) at both ends of the rotor (2), and a limiting protrusion (31) is formed on one end of the brake block (3) facing the positioning boss (41) to match the limiting groove (43); In the working state, the stator winding (5) generates magnetic lines of force and forms a magnetic field after being energized, and the rotor (2) moves to a central position under the action of electromagnetic force in the magnetic field and forms an electromagnetic torque to rotate; in the non-working state, the limiting protrusion (31) is embedded in the limiting groove (43) to limit the rotation of the rotor (2).

2. A brake motor according to claim 1, characterized in that: The brake block (3) is of an annular structure, the limiting protrusions (31) are evenly distributed along the circumferential direction of the brake block (3), and the cross-section of the limiting protrusions (31) is triangular.

3. A brake motor according to claim 2, characterized in that: The bottom of the limiting protrusion (31) is in a circular arc transition.

4. A brake motor according to claim 1, characterized in that: A bearing accommodating groove (42) is formed at the center of the positioning boss (41), and the oil-containing bearing (8) is placed in the bearing accommodating groove (42).

5. The brake motor according to claim 1, characterized in that: There is a clearance fit between the rotating shaft (1) and the oil-containing bearing (8), and the rotating shaft (1) can slide axially relative to the oil-containing bearing (8).

6. The brake motor according to claim 1, characterized in that: The bracket (4) is connected and fixed to the stator core (6) via a locking bolt assembly (7).

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