CN209787007U - permanent-magnet DC motor - Google Patents

Abstract

The utility model discloses a permanent magnetism direct current motor, including stator module and rotor subassembly, this stator module includes an iron section of thick bamboo and sets up the permanent magnetism magnet in this iron section of thick bamboo inside, this rotor subassembly includes the axle core with the coaxial setting of this iron section of thick bamboo, be equipped with rotor and commutator on this axle core, this permanent magnetism magnet is around this rotor periphery, be equipped with the coil on this rotor, all be equipped with the louvre on this iron section of thick bamboo terminal surface and the circumference lateral wall, another terminal surface is uncovered, still including rubber cover and the rectifier bridge of setting on this rubber cover, this rubber cover covers the uncovered of this iron section of thick bamboo, the inboard central symmetry of this rubber cover is equipped with two cavities, be equipped with the carbon brush in this cavity, the inner of this carbon brush radially stretches out this cavity and presses to on this commutator, this rectifier bridge input is connected with alternating current power supply, the output is connected with. The rubber cover directly covers the opening of the iron cylinder, the stator assembly adopts the permanent magnet, the structure is simple, the assembly process is simple, the number of parts is small, the material cost is reduced, and the assembly and disassembly are easy.

Description

Permanent-magnet DC motor

Technical Field

The utility model relates to a permanent magnet direct current motor especially relates to aerify the permanent magnet direct current motor of usefulness.

Background

When the motor runs, heat is generated due to magnetic loss, friction, coil heating and the like, and when the motor runs for a long time, an insulation system of the motor is damaged due to overhigh temperature, so that a short circuit is caused, and the motor is burnt out. The motors used for air pump products have high requirements on temperature rise.

At present, the stator of the air pump is basically open, and the front bracket and the rear bracket provide supporting force, so that the heat dissipation is better. However, in the motor with such a structure, the front and rear brackets need to be locked by a plurality of groups of bolts during assembly, so that the number of parts is large, the assembly is troublesome, and the production cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model provides a permanent magnet direct current motor, convenient equipment is and effective reduction in production cost. The utility model provides a technical scheme that its technical problem adopted is:

A permanent magnet direct current motor comprises a stator component and a rotor component, wherein the stator component comprises an iron cylinder and a permanent magnet arranged in the iron cylinder, the rotor component comprises a shaft core which is coaxial with the iron cylinder, the shaft core is provided with a rotor and a commutator, the permanent magnet surrounds the periphery of the rotor, the rotor is provided with a coil, one end surface and the circumferential side wall of the iron cylinder are provided with heat dissipation holes, the other end surface of the iron cylinder is open, the commutator is positioned at one end of the rotor facing the open end of the iron cylinder, the permanent magnet direct current motor also comprises a rubber cover and a rectifier bridge arranged on the rubber cover, the rubber cover covers the open end of the iron cylinder, the shaft core is rotatably erected on one end surface of the iron cylinder and the rubber cover, two cavities are symmetrically arranged at the center of the inner side of the rubber cover, carbon brushes are arranged in the cavities, the inner ends of the carbon brushes radially extend out of the cavities and press against the commutator, and the input ends of the rectifier bridge, the output end is electrically connected with the carbon brush.

In a preferred embodiment: the rubber cover is buckled with the iron cylinder.

In a preferred embodiment: the iron cylinder is formed by cold rolling and stamping a metal plate, and the rubber cover is formed by injection molding of an insulating nylon material.

In a preferred embodiment: the reinforcing ribs are pressed out together when the iron cylinder is stamped.

In a preferred embodiment: the rubber cover and the iron cylinder are respectively provided with a groove for mounting the oil-containing bearing, the groove is covered by the pressing sheet to axially limit the oil-containing bearing, and the oil-containing bearing is in transmission connection with the shaft core, the rubber cover and the iron cylinder.

In a preferred embodiment: the rubber cover is provided with a spring corresponding to the carbon brush, the spring is tensioned between the rubber cover and the carbon brush, and the carbon brush is elastically pressed on the commutator.

In a preferred embodiment: the side wall of the chamber is provided with an opening, the spring is a torsion spring, one leading-out arm is connected with the rubber cover, and the other leading-out arm extends into the chamber from the opening and acts on the carbon brush.

In a preferred embodiment: the carbon brush is characterized by further comprising a current protector arranged on the rubber cover, and the current protector is electrically connected between the rectifier bridge and the carbon brush.

In a preferred embodiment: the rotor assembly also includes two end plates connected to the shaft core and holding the rotor.

In a preferred embodiment: application to inflatable products.

Compared with the background technology, the technical scheme has the following advantages:

1. The iron cylinder is of a sleeve structure, and heat dissipation holes are formed in one end face and the circumferential side wall, so that the heat dissipation speed generated when the motor operates is increased, and the temperature rise of the motor is reduced. The rubber cover directly covers the opening of the iron cylinder, the stator assembly adopts the permanent magnet, the structure is simple, the assembly process is simple, the number of parts is small, the material cost is reduced, and the assembly and disassembly are easy.

2. this motor iron cylinder subassembly, back rubber cover subassembly have used universal oily slide bearing, have guaranteed the higher concentricity of rotor subassembly and stator module, make the motor move smoothly steady.

3. The rubber cover and the iron cylinder are mutually buckled into a whole, the assembly connection is tight, the positioning is good, and the production assembly efficiency and the quality are improved.

4. The rubber cover is formed by injection molding of an insulating nylon material, and has high-grade temperature resistance, heat resistance, electric shock protection and other effects.

5. The rectifier bridge can convert an alternating current power supply of commercial power into direct current to drive the permanent magnet direct current motor to operate.

6. The current protector has a current limiting protection function, and can protect the motor from being damaged when the motor works abnormally.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic perspective view of a permanent magnet dc motor according to the present invention.

Fig. 2 is an exploded view of the permanent magnet dc motor shown in fig. 1.

Fig. 3 is a further exploded view of the permanent magnet dc motor of fig. 1.

Fig. 4 is a schematic perspective view illustrating a rubber cover of the permanent magnet dc motor shown in fig. 1.

Fig. 5 is a schematic cross-sectional view of the permanent magnet dc motor shown in fig. 1.

Fig. 6 is a circuit diagram of the permanent magnet dc motor shown in fig. 1.

Detailed Description

Referring to fig. 1 to 6, a permanent magnet dc motor, especially for use in an inflatable product, includes a stator assembly 10, a rotor assembly 20, and a rubber cover 30. The stator assembly 10 includes an iron can 12 and a permanent magnet 14 disposed inside the iron can. The rotor assembly 20 includes a shaft 22 disposed coaxially with the iron cylinder, the shaft is provided with a rotor 24 and a commutator 26, the permanent magnet 14 surrounds the rotor 24, and the rotor 24 is provided with a coil 28. The above description of the structure and operation of the stator assembly 10 and the rotor assembly 20 is prior art and will not be described in great detail. One end face and the circumferential side wall of the iron cylinder 12 are provided with heat dissipation holes, the other end face is open, the commutator 26 is positioned at one end of the rotor 24 facing the opening of the iron cylinder 12, and the rubber cover 30 covers the opening of the iron cylinder 12. The shaft core 22 is rotatably erected on an end face of the iron cylinder 12 and the rubber cover 30, two cavities 32 are symmetrically arranged at the inner side of the rubber cover 30, a carbon brush 40 is arranged in the cavity 32, and the inner end of the carbon brush 40 radially extends out of the cavity 32 and is pressed against the commutator 26. A rectifier bridge 50 is disposed on the rubber cover 30, an input end of the rectifier bridge 50 is connected to an ac power supply, and an output end of the rectifier bridge 50 is electrically connected to the carbon brush 40. The alternating current is output as direct current after passing through the rectifier bridge 50, and drives the rotor assembly 20 of the permanent magnet direct current motor to rotate to generate power, so as to drive the electric appliance product to operate.

The rubber cover 30 is connected with the iron cylinder 12 in a buckling manner.

The iron cylinder 12 is formed by cold-rolling and pressing a metal plate, and the reinforcing ribs are pressed out of the iron cylinder 12 at the same time. The rubber cover 30 is made of an insulating nylon material by injection molding. The rubber cover 30 and the iron cylinder 12 are respectively provided with a groove for mounting the oil-retaining bearing 60, the pressing sheet 70 covers the groove to axially limit the oil-retaining bearing 60, and the oil-retaining bearing 60 is in transmission connection with the shaft core 22, the rubber cover 30 and the iron cylinder 12. The oil bearing 60 ensures high concentricity of the rotor assembly 20 and the stator assembly 10, and the motor operates smoothly and stably

The rubber cover 30 is provided with a spring 80 corresponding to the carbon brush 40, the spring 80 is tensioned between the rubber cover 30 and the carbon brush 40, and the carbon brush 40 is elastically pressed on the commutator 26. The side wall of the chamber 32 is provided with an opening, the spring 80 is a torsion spring, one leading arm is connected with the rubber cover, and the other leading arm extends into the chamber from the opening and acts on the carbon brush.

The rotor assembly 20 further includes two end plates 21, the two end plates 21 being attached to the core 22 and holding the rotor 24. The carbon brush further comprises a current protector 90 arranged on the rubber cover, the current protector 90 is electrically connected between the rectifier bridge 50 and the carbon brush 40, and the rectifier bridge 50 and the current protector 90 are connected to form a loop.

In this embodiment, the outer dimension range of the motor is: shaft outside diameter D1 rangeRange of iron cylinder external diameter D2The height H of the iron cylinder ranges from 40 mm to 65 mm; the thickness t of the iron cylinder ranges from 0.5 mm to 2 mm; the total length L2 of the motor ranges from 40 mm to 120 mm. The motor has the use voltage range of 100V-240V/50-60 Hz AC, the power range of 30-150W, the rotating speed range of 12000-25000 RPM, the stable wind pressure range of 200-500 mm/H2O when the air pump is installed, and the motor can be adjusted according to the torque force and the rotating direction required by a customer.

The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.

Claims (10)

1. The utility model provides a permanent magnetism direct current motor, includes stator module and rotor subassembly, this stator module includes an iron drum and sets up the permanent magnetism magnet in this iron drum inside, this rotor subassembly include with the axle core of the coaxial setting of this iron drum, be equipped with rotor and commutator on this axle core, this permanent magnetism magnet is around this rotor periphery, is equipped with coil, its characterized in that on this rotor: all be equipped with the louvre on this iron cylinder terminal surface and the circumference lateral wall, another terminal surface is uncovered, this commutator is located this rotor towards this iron cylinder open one end, still including the jiao gai and set up the rectifier bridge on this jiao gai, this jiao gai covers the uncovered of this iron cylinder, this axle core is rotatable erects on this iron cylinder terminal surface and this jiao gai, the inboard central symmetry of this jiao gai is equipped with two cavities, be equipped with the carbon brush in this cavity, the inner of this carbon brush radially stretches out this cavity and presses and supports on this commutator, this rectifier bridge input is connected with alternating current power supply, the output is connected with this carbon brush electricity.

2. The permanent magnet dc motor according to claim 1, characterized in that: the rubber cover is buckled with the iron cylinder.

3. The permanent magnet dc motor according to claim 2, wherein: the iron cylinder is formed by cold rolling and stamping a metal plate, and the rubber cover is formed by injection molding of an insulating nylon material.

4. The permanent magnet dc motor according to claim 3, wherein: the reinforcing ribs are pressed out together when the iron cylinder is stamped.

5. The permanent magnet direct current motor according to claim 1 or 2, characterized in that: the rubber cover and the iron cylinder are respectively provided with a groove for mounting the oil-containing bearing, the groove is covered by the pressing sheet to axially limit the oil-containing bearing, and the oil-containing bearing is in transmission connection with the shaft core, the rubber cover and the iron cylinder.

6. The permanent magnet dc motor according to claim 1, characterized in that: the rubber cover is provided with a spring corresponding to the carbon brush, the spring is tensioned between the rubber cover and the carbon brush, and the carbon brush is elastically pressed on the commutator.

7. The permanent magnet dc motor according to claim 6, wherein: the side wall of the chamber is provided with an opening, the spring is a torsion spring, one leading-out arm is connected with the rubber cover, and the other leading-out arm extends into the chamber from the opening and acts on the carbon brush.

8. The permanent magnet dc motor according to claim 1, characterized in that: the carbon brush is characterized by further comprising a current protector arranged on the rubber cover, and the current protector is electrically connected between the rectifier bridge and the carbon brush.

9. The permanent magnet dc motor according to claim 1, characterized in that: the rotor assembly also includes two end plates connected to the shaft core and holding the rotor.

10. The permanent magnet dc motor according to claim 1, characterized in that: application to inflatable products.