Direct current motor with brake structure

Abstract

The utility model discloses a direct current motor with a brake structure, which comprises a motor assembly and a brake assembly, the motor assembly comprises a front end cover, a front casing, a rotor, a motor shaft, a brush carrier plate and a Hall plate, the brake assembly comprises a rear casing, a coil, a brake piece, a rear end cover, a spring and a brake pad, the front casing is connected with the rear casing, and the rear casing is connected with the rotor. The rotor and the motor shaft are arranged in the front machine shell, the motor shaft penetrates through the middle of the rotor, the brake piece is installed on the motor shaft, a rubber disc is arranged on the brake piece, a through hole is formed in the middle of the rear end cover, the spring is installed in the through hole, and one end of the spring is connected with the brake pad. During braking, the brake pad is connected with the rubber disc; according to the utility model, under the action of the coil, the spring, the brake pad and the rubber disc, the rotation of the motor shaft is controlled, and the brake of the motor is controlled, so that the motor is more convenient to use, and the brake of the motor is more accurately controlled.

Description

TECHNICAL FIELD

[0001] The utility model relates to a direct current motor with brake structure. BACKGROUND

[0002] Miniature DC motors have been widely used in various scenarios, such as electric lifting clothes drying rack, electric curtain, etc. They have the advantages of small size, easy installation, low voltage and current requirement, etc. and can solve the problems caused by the use of high-power motors. The main problem of the existing DC motor is the brake control. The brake mode generally includes three types: 1. Reverse connection braking: by changing the connection mode of the motor's working terminal and starting terminal, the current direction is opposite to that in normal operation, generating a reverse torque opposite to the direction of the rotor, thus slowing down the rotor and eventually stopping it. This method is suitable for short-time or frequent braking; 2. Energy consumption braking: the working terminal of the motor is connected to the negative pole of the power supply, and the starting terminal is connected to the positive pole of the power supply, and an electric resistance or energy storage device is used to consume energy, thus achieving braking. This method is suitable for long-time braking or energy recovery; 3. Mechanical braking: by using a clutch or disconnecting the motor from the drive system to achieve braking, which is suitable for precise stopping or reversible driving. These braking methods are either only suitable for medium and large-sized motors or difficult to achieve precise control of braking, which cannot meet the needs of miniature DC motors and affects the use of miniature DC motors. Therefore, it is necessary to develop a DC motor with brake structure. SUMMARY

[0003] The utility model wants to solve the technical problem to provide a kind of with brake structure's direct current motor with practicality and use extensive, it is easy to use, simple operation, compact structure, with brake structure, brake performance is good, can realize the quick parking operation of motor, it has.

[0004] To solve the above problems, the utility model adopts the following technical scheme:

[0005] A DC motor with brake structure, comprising a motor assembly and a brake assembly, the motor assembly comprising a front end cover, a front housing, a rotor, a motor shaft, a brush holder plate and a Hall plate, the brake assembly comprising a rear housing, a coil, a brake piece, a rear end cover, a spring and a brake pad, the coil is arranged in the rear end cover;The front housing is connected with the rear housing, the rotor and the motor shaft are arranged in the front housing, the motor shaft passes through the rotor, the both ends of the motor shaft are respectively provided with bearing one and bearing two, the bearing one is arranged in the front end cover, the bearing two is arranged in the rear housing, the brake piece is installed on the motor shaft, and a rubber disc is arranged on the brake piece, a through hole is arranged in the middle of the rear end cover, the spring is arranged in the through hole, and one end of the spring is connected with the brake pad;When braking, the brake pad is connected with the rubber disc.

[0006] Preferably, the rear shell is provided with a limiting groove, the brake pad is provided with a boss, the boss is arranged in the limiting groove, and the brake pad is limited in the moving direction through the boss and the limiting groove, thereby increasing the stability of the brake pad during braking.

[0007] Preferably, the outer side of the rear end cover is provided with a groove, and the rear shell is provided with a limiting block matched with the groove; the rear end cover is installed in the rear shell through the cooperation of the groove and the limiting block, and is limited after installation.

[0008] The utility model discloses the beneficial effect is: through the spring to the brake pad's tensile force effect, makes the brake pad and rubber disc separate, makes the brake assembly not to influence the normal use of motor assembly, when needing to brake, coil power supply, and the coil generates the repulsion of brake pad, and the brake piece is contacted with rubber disc under the action of magnetic force, and the rubber disc and brake piece, motor shaft stop rotation through the extrusion force and the action of friction force, realize the effect of brake stop, it is convenient to use, and simple operation, compact structure, and the brake structure is self -contained, and the brake performance is good, can realize the quick parking operation of motor, and it has practicality and the universality of use. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, below will to the drawing needed to be used in the embodiment or prior art description simple introduction, but is not to the utility model protection range's limitation.

[0010] Fig. 1 It is the structural schematic diagram of the utility model;

[0011] Fig. 2 It is the sectional view schematic diagram of the utility model;

[0012] Fig. 3 It is the internal structure schematic diagram of the utility model.

[0013] Among them, 1. front end cover, 2. front shell, 3. rear shell, 4. terminal, 5. rotor, 6. motor shaft, 7. bearing one, 8. bearing two, 9. coil, 10. brake piece, 11. rubber disc, 12. rear end cover, 13. spring, 14. brake pad, 15. brush holder plate, 16. hall board, 17. limiting groove, 18. boss, 19. limiting block, 20. groove. DETAILED DESCRIPTION

[0014] Reference Figs. 1 to 3The direct current motor with brake structure shown in the application comprises a motor assembly and a brake assembly, the motor assembly comprises a front end cover 1, a front casing 2, a rotor 5, a motor shaft 6, a brush holder plate 15 and a Hall plate 16, the brake assembly comprises a rear casing 3, a coil 9, a brake piece 10, a rear end cover 12, a spring 13 and a brake pad 14, the coil 9 is arranged in the rear end cover 12.

[0015] Further, the front casing 2 is connected with the rear casing 3, the rotor 5 and the motor shaft 6 are arranged in the front casing 2, the motor shaft 6 passes through the middle of the rotor 5, and the two ends of the motor shaft 6 are respectively provided with bearing one 7 and bearing two 8, the bearing one 7 is arranged in the front end cover 1, and the bearing two 8 is arranged in the rear casing 3.

[0016] Further, the brake piece 10 is arranged on the motor shaft 6, a rubber disc 11 is arranged on the brake piece 10, a through hole is arranged in the middle of the rear end cover 12, the spring 13 is arranged in the through hole, and one end of the spring 13 is connected with the brake pad 14; when braking, the brake pad 14 is connected with the rubber disc 11.

[0017] Further, a limiting groove 17 is arranged on the rear casing 3, and a boss 18 is arranged on the brake pad 14, the boss 18 is arranged in the limiting groove 17.

[0018] Further, a recess 20 is arranged on the outer side of the rear end cover 12, and a limiting block 19 matched with the recess is arranged on the rear casing 3.

[0019] Further, the brush holder plate and the Hall plate are arranged in the rear casing, and a wiring terminal 4 and a brush are arranged on the brush holder plate.

[0020] Further, a Hall sensor (not shown) is arranged on the Hall plate.

[0021] Further, the coil cooperates with the brake pad.

[0022] Further, the front casing and the rear casing are connected through screws, and part of the rear casing is embedded in the front casing.

[0023] Further, the limiting groove 17 and the boss 18 are both multiple.

[0024] The utility model discloses when using, according to the installation of DC motor of use environment, realizes the access of power supply and signal through the wiring terminal, when motor works, motor shaft rotates, brake pad and rubber disc, brake piece are in the clutch state, the coil does not produce magnetic force without electrification, and simultaneously brake pad is adhered on rear end cover under spring tension effect, when needing timely brake, motor stops working, and motor shaft loses power first, and subsequently coil electrification, and coil produces magnetic force, and coil separates brake pad and rear end cover through magnetic force, simultaneously makes brake pad and rubber disc contact, passes through the effect of friction force and extrusion pressure, makes rubber disc, brake piece and so on stop rotating, reaches the effect of brake, subsequently coil power failure, and brake pad resets under the tension effect of spring.

[0025] The above is only the specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, and any change or replacement without creative labor should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be the protection scope defined in the claims.

Claims

1. A direct current motor with a brake structure, characterized by: The motor assembly comprises a front end cover, a front casing, a rotor, a motor shaft, a brush holder plate and a Hall plate, and the brake assembly comprises a rear casing, a coil, a brake piece, a rear end cover, a spring and a brake pad, and the coil is arranged in the rear end cover; The front casing is connected with the rear casing, the rotor and the motor shaft are arranged in the front casing, the motor shaft passes through the middle of the rotor, both ends of the motor shaft are respectively provided with bearing one and bearing two, the bearing one is arranged in the front end cover, and the bearing two is arranged in the rear casing; The brake piece is arranged on the motor shaft, a rubber disc is arranged on the brake piece, a through hole is arranged in the middle of the rear end cover, the spring is arranged in the through hole, and one end of the spring is connected with the brake pad; when braking, the brake pad is connected with the rubber disc.

2. A DC motor with brake structure according to claim 1, characterized in that: A limiting groove is arranged on the rear casing, a boss is arranged on the brake pad, and the boss is arranged in the limiting groove.

3. A DC motor with brake structure according to claim 1, characterized in that: A recess is arranged on the outer side of the rear end cover, and a limiting block matched with the recess is arranged on the rear casing.

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