Large-torque permanent magnet direct current motor

Abstract

The utility model provides a large torque permanent magnet direct current motor, which comprises a motor shell, a rear cover, a first bearing, a second bearing, a rotating shaft, a rotor core, an arc-shaped magnet, a heat dissipation assembly, a commutator and a carbon brush assembly, and is characterized in that the heat dissipation assembly comprises a front fixing ring, a rear fixing ring and heat dissipation blades which are integrally arranged, and the periphery of the motor shell is provided with a plurality of groups of first heat dissipation holes; the heat dissipation assembly is provided with a first heat dissipation hole corresponding to the heat dissipation blades, the middle part of the heat dissipation assembly is provided with an installation cavity, the commutator is fixed on the rotating shaft, the front end of the commutator corresponds to the interior of the installation cavity, and the carbon brush assembly is fixed at the rear end of the motor shell and corresponds to the front side of the rear cover. According to the motor, the mounting distance between the commutator and the rotor core can be shortened, the structure of the motor is more compact, the size of the motor is further reduced, on the other hand, the heat dissipation assembly can quickly discharge heat from the first heat dissipation holes, the heat dissipation capability of the motor is improved, and the service life of the motor is further prolonged.

Description

Technical Field

[0001] The utility model relates to the field of DC motor structures, and particularly to a high-torque permanent magnet DC motor. Background Art

[0002] With the continuous development of smart home appliances, motors have been widely used in various electrical appliances. As a common beverage-making appliance, an ice crusher also has a motor installed inside. The motor drives the stirring blades to rotate at a high speed, thereby quickly crushing the ice cubes. Different from other household appliances, the motor used in the ice crusher requires a greater torque to provide stronger power for crushing ice cubes or other hard objects. Therefore, the motors in traditional ice crushers are larger in size and volume, and generate more heat during operation, resulting in a larger overall volume of the ice crusher and poor heat dissipation performance of the motor. Therefore, it is necessary to manufacture a high-torque permanent magnet DC motor to solve the above problems. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a high-torque permanent magnet DC motor to solve the problems mentioned in the background art.

[0004] To achieve the above purpose, the utility model provides the following technical solutions:

[0005] A high-torque permanent magnet DC motor includes a motor housing, a rear cover, a first bearing, a second bearing, a rotating shaft, a rotor core, arc magnets, a heat dissipation component, a commutator, and a carbon brush assembly. There is an opening at the rear end of the motor housing, and the rear cover is fixed at the opening of the motor housing. The first bearing is fixed at the front end of the motor housing, and the second bearing is fixed on the rear cover. The front and rear ends of the rotating shaft are rotatably installed on the first bearing and the second bearing respectively. The rotor core is fixed at the front end of the rotating shaft and corresponds to the inside of the motor housing. The arc magnets are fixed on the inner wall of the motor housing and correspond to the outer periphery of the rotor core. Two sets of arc magnets are symmetrically arranged about the rotor core on the left and right. The heat dissipation component includes an integrally formed front fixing ring, a rear fixing ring, and heat dissipation fins. The front end of the front fixing ring is fixed at the rear end of the rotor core. Multiple groups of heat dissipation fins are provided and evenly fixed at the rear end of the front fixing ring. The rear fixing ring is fixed at the rear end of the heat dissipation fins. Multiple groups of first heat dissipation holes are provided on the outer periphery of the motor housing, and the first heat dissipation holes correspond to the heat dissipation fins. An installation cavity is provided in the middle of the heat dissipation component. The commutator is fixed on the rotating shaft and the front end corresponds to the inside of the installation cavity. The carbon brush assembly is fixed at the rear end of the motor housing and corresponds to the front side of the rear cover. The winding on the rotor core is connected to the commutator, and the carbon brushes on the carbon brush assembly are in contact with the rear end of the commutator.

[0006] A further description of the utility model: An exhaust cavity is formed between adjacent heat dissipation fins, a connecting rib is formed between adjacent first heat dissipation holes, and the outer end width of the exhaust cavity is greater than the width of the connecting rib.

[0007] Further description of the present utility model: A plurality of groups of second heat dissipation holes are evenly arranged at the front end of the motor housing, and a plurality of groups of third heat dissipation holes are evenly arranged on the rear cover.

[0008] Further description of the present utility model: It further includes a magnetic shielding ring, and the magnetic shielding ring is fixed on the outer periphery of the motor housing and corresponds to the arc-shaped magnet.

[0009] The beneficial effects of the present utility model are as follows: When the motor is powered on and under the magnetic force of the arc-shaped magnet, the rotor core rotates, thereby driving the rotating shaft to rotate. During the rotation of the rotor core, the heat dissipation component is simultaneously driven to rotate, and the heat inside the motor is discharged outward. Through directly fixing the heat dissipation component on the rotor core and arranging an installation cavity in the middle, the installation distance between the commutator and the rotor core can be shortened, making the structure of the motor more compact, and further reducing the volume of the motor. On the other hand, the heat dissipation component can quickly discharge the heat from the first heat dissipation holes, improving the heat dissipation capacity of the motor, and further extending the service life of the motor. Description of the Drawings

[0010] Figure 1 is the overall structure diagram of the present utility model (front view perspective);

[0011] Figure 2 is the overall structure diagram of the present utility model (rear view perspective);

[0012] Figure 3 is the overall structure diagram of the present utility model (wherein the motor housing and the magnetic shielding ring are hidden);

[0013] Figure 4 is the structure diagram of the heat dissipation component in the present utility model;

[0014] Description of the Reference Numerals:

[0015] 01, motor housing; 011, first heat dissipation hole; 012, connecting rib; 013, second heat dissipation hole; 02, rear cover; 021, third heat dissipation hole; 03, first bearing; 04, second bearing; 05, rotating shaft; 06, rotor core; 07, arc-shaped magnet; 08, heat dissipation component; 081, front fixing ring; 082, rear fixing ring; 083, heat dissipation fin; 084, installation cavity; 085, exhaust cavity; 09, commutator; 10, carbon brush assembly; 11, magnetic shielding ring. Detailed Embodiment

[0016] The present utility model will be further described below with reference to the accompanying drawings:

[0017] Such as Figures 1 to 4As shown in the figure, a high-torque permanent magnet DC motor includes a motor housing 01, a rear cover 02, a first bearing 03, a second bearing 04, a rotating shaft 05, a rotor core 06, arc magnets 07, a heat dissipation component 08, a commutator 09, and a carbon brush assembly 10. There is an opening at the rear end of the motor housing 01, and the rear cover 02 is fixed at the opening of the motor housing 01. The first bearing 03 is fixed at the front end of the motor housing 01, and the second bearing 04 is fixed on the rear cover 02. The front and rear ends of the rotating shaft 05 are rotatably installed on the first bearing 03 and the second bearing 04 respectively. The rotor core 06 is fixed at the front end of the rotating shaft 05 and corresponds to the inside of the motor housing 01. The arc magnets 07 are fixed on the inner wall of the motor housing 01 and correspond to the outer periphery of the rotor core 06. Two groups of arc magnets 07 are symmetrically arranged about the rotor core 06 on the left and right. The heat dissipation component 08 includes a front fixing ring 081, a rear fixing ring 082, and heat dissipation fins 083 which are integrally arranged. The front end of the front fixing ring 081 is fixed at the rear end of the rotor core 06. Multiple groups of heat dissipation fins 083 are arranged and evenly fixed at the rear end of the front fixing ring 081. The rear fixing ring 082 is fixed at the rear end of the heat dissipation fins 083. Multiple groups of first heat dissipation holes 011 are provided on the outer periphery of the motor housing 01, and the first heat dissipation holes 011 correspond to the heat dissipation fins 083. An installation cavity 084 is provided in the middle of the heat dissipation component 08. The commutator 09 is fixed on the rotating shaft 05 and the front end corresponds to the inside of the installation cavity 084. The carbon brush assembly 10 is fixed at the rear end of the motor housing 01 and corresponds to the front side of the rear cover 02. The winding on the rotor core 06 is connected to the commutator 09, and the carbon brush on the carbon brush assembly 10 contacts the rear end of the commutator 09.

[0018] When the motor is powered on and under the magnetic force of the arc magnets 07, the rotor core 06 rotates, thereby driving the rotating shaft 05 to rotate. During the rotation of the rotor core 06, the heat dissipation component 08 is simultaneously driven to rotate, discharging the heat inside the motor to the outside. In this design, by directly fixing the heat dissipation component 08 on the rotor core 06 and providing an installation cavity 084 in the middle, the installation distance between the commutator 09 and the rotor core 06 can be shortened, making the structure of the motor more compact, and thus reducing the volume of the motor. On the other hand, the heat dissipation component 08 can quickly discharge the heat from the first heat dissipation holes 011, improving the heat dissipation capacity of the motor and extending the service life of the motor.

[0019] An exhaust cavity 085 is formed between adjacent heat dissipation fins 083, and a connecting rib 012 is formed between adjacent first heat dissipation holes 011. The outer end width of the exhaust cavity 085 is greater than the width of the connecting rib 012. By setting the outer end width of the exhaust cavity 085 to be greater than the width of the connecting rib 012, when the exhaust cavity 085 corresponds to the connecting rib 012, it can always maintain a state of being connected to the outside of the motor, avoiding the connecting rib 012 completely covering the exhaust cavity 085 and generating a large resistance, and improving the heat dissipation effect.

[0020] A plurality of groups of second heat dissipation holes 013 are uniformly provided at the front end of the motor housing 01, and a plurality of groups of third heat dissipation holes 021 are uniformly arranged on the rear cover 02. The second heat dissipation holes 013 and the third heat dissipation holes 021 are respectively conducive to the heat dissipation of the front end and the rear end of the motor.

[0021] In this design, it further includes a magnetic protection ring 11, and the magnetic protection ring 11 is fixed on the outer periphery of the motor housing 01 and corresponds to the arc-shaped magnet 07. The magnetic protection ring 11 has a protective effect on the arc-shaped magnet 07 and can also reduce the magnetic interference to the outside.

[0022] The above does not impose any limitation on the technical scope of the present utility model. Any modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A high torque permanent magnet DC motor, characterized in that: The invention comprises a motor housing, a rear cover, a first bearing, a second bearing, a rotating shaft, a rotor core, an arc magnet, a heat dissipation assembly, a commutator and a carbon brush assembly. The rear end of the motor housing is provided with an opening. The rear cover is fixed at the opening of the motor housing. The first bearing is fixed at the front end of the motor housing. The second bearing is fixed on the rear cover. The front and rear ends of the rotating shaft are rotatably mounted on the first bearing and the second bearing respectively. The rotor core is fixed at the front end of the rotating shaft and corresponds to the inside of the motor housing. The arc magnet is fixed to the inner wall of the motor housing and corresponds to the outer periphery of the rotor core. The arc magnet is symmetrically arranged in two groups about the rotor core. The heat dissipation assembly The component includes an integrally arranged front fixing ring, a rear fixing ring and heat dissipation blades, the front end of the front fixing ring is fixed to the rear end of the rotor core, the heat dissipation blades are arranged in multiple groups and are evenly fixed to the rear end of the front fixing ring, the rear fixing ring is fixed to the rear end of the heat dissipation blades, the outer periphery of the motor housing is provided with multiple groups of first heat dissipation holes, the first heat dissipation holes correspond to the heat dissipation blades, a mounting cavity is provided in the middle of the heat dissipation component, the commutator is fixed on the rotating shaft and the front end corresponds to the mounting cavity, the carbon brush assembly is fixed to the rear end of the motor housing and corresponds to the front side of the rear cover, the winding on the rotor core is connected to the commutator, and the carbon brushes on the carbon brush assembly are in contact with the rear end of the commutator.

2. A high torque permanent magnet DC motor according to claim 1, characterized in that: An exhaust cavity is formed between adjacent heat dissipation blades, and a connecting rib is formed between adjacent first heat dissipation holes. The width of the outer end of the exhaust cavity is greater than the width of the connecting rib.

3. A high torque permanent magnet DC motor according to claim 1, characterized in that: The front end of the motor housing is evenly provided with a plurality of groups of second heat dissipation holes, and the rear cover is evenly provided with a plurality of groups of third heat dissipation holes.

4. The high torque permanent magnet DC motor according to claim 1, characterized in that: It also includes a magnetic protection ring, which is fixed on the outer periphery of the motor housing and corresponds to the arc magnet.

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