CN204538838U - A kind of permanent-magnet motor rotor - Google Patents

Abstract

The utility model discloses a permanent magnet motor rotor, which comprises a motor shaft, an inner iron core and an outer iron core. A gap is arranged between the inner iron core and the outer iron core, and the gap is filled with injection molding rubber; the outer surface of the outer iron core A plurality of limiting ribs are evenly arranged along its circumference, and a permanent magnet is engaged in two adjacent limiting ribs; the outer sides of each permanent magnet and each limiting rib are covered with injection-molded plastics. After adopting the above structure, the permanent magnet and the outer iron core are molded by injection molding plastic at one time, so that the permanent magnet can be prevented from falling off due to centrifugal force during the rotation of the rotor or the permanent magnet is not firmly installed and falling off. In addition, the connection between the inner iron core and the outer iron core is formed by injection molding rubber, which can effectively reduce the vibration of the rotor, make the motor run smoothly and reduce noise. At the same time, the injection molding rubber insulates, cuts off the current loop, and prevents the current from flowing to the bearing through the rotating shaft, thereby effectively reducing the internal electric corrosion effect of the plastic-sealed motor bearing and improving the performance and life of the motor.

Description

A permanent magnet motor rotor

technical field

The utility model relates to a motor rotor, in particular to a permanent magnet motor rotor for a fan.

Background technique

At present, the permanent magnet motor rotor mostly adopts an integrally formed iron core, and the permanent magnet is bonded and fixed on the outside of the iron core. The rotor with such a structure is prone to the following defects during the use of the motor:

1. The permanent magnet is easy to fall off due to centrifugal force during the rotation of the rotor.

2. Discharge corrosion is prone to occur inside the motor bearing, which reduces the service life of the motor.

3. The vibration is large and the noise is poor, which affects the normal operation and use of the whole machine.

Utility model content

The technical problem to be solved by the utility model is to provide a permanent magnet with a firm connection between the rotor and the permanent magnet, which is not easy to fall off, can avoid discharge corrosion inside the motor bearing, and has low vibration and low noise. motor rotor.

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:

A rotor for a permanent magnet motor, comprising a motor shaft, an inner iron core set on the outer periphery of the motor shaft, an outer iron core set on the outer periphery of the inner iron core, a gap is provided between the inner iron core and the outer iron core, the The gap is filled with injection molded rubber; the outer surface of the outer iron core is evenly provided with several limiting ribs along its circumference, and a permanent magnet is engaged in two adjacent limiting ribs; each of the permanent magnets and each The outer sides of the limiting ribs are covered with injection-molded plastics.

The outer surface of the inner iron core is uniformly provided with several first bosses along its circumference.

The inner surface of the outer iron core is evenly provided with several second bosses along its circumference.

The number of the first boss and the second boss is equal, the position of the first boss and the second boss are corresponding, and there is a minimum gap between the first boss and the second boss, and the minimum gap is Also filled with injection molded rubber.

There are 8 limiting ribs and permanent magnets.

After the utility model adopts the above-mentioned structure, it has the following beneficial effects:

1. The rotor core of this application is divided into an inner core and an outer core, which can effectively reduce the internal electric corrosion of the motor bearing and improve the performance and life of the motor.

2. The setting of the above-mentioned limiting ribs and the injection-molded plastic-coated permanent magnets are firmly fixed and beautiful, and have an insulating effect. In addition, the permanent magnet and the outer iron core are molded by injection molding plastic at one time, which can effectively prevent the permanent magnet from falling off due to centrifugal force during the rotation of the rotor or the permanent magnet from being loosely installed and falling off. At the same time, the production process can be simplified and convenient, and the production cost can be reduced. At the same time, the injection molding rubber insulates, cuts off the current loop, and prevents the current from flowing to the bearing through the rotating shaft, thereby effectively reducing the internal electric corrosion effect of the plastic-sealed motor bearing and improving the performance and life of the motor.

3. The inner iron core and the outer iron core are connected by injection molding rubber, which can effectively reduce the vibration of the rotor, make the motor run smoothly and reduce noise.

4. The setting of the above-mentioned first boss and second boss can improve the firmness of the connection between the outer iron core and the inner iron core and the injection rubber, and increase the service life.

5. Further, the permanent magnet of the present application preferably adopts a post-magnetization process, that is, after the rotor is injection molded, the magnetic steel of the permanent magnet is magnetized before the rotor is assembled, thereby avoiding the scrapping of the permanent magnet in the production turnover link. Can effectively reduce production costs.

Description of drawings

Fig. 1 is a structural schematic diagram of a permanent magnet motor rotor of the present invention.

Among them: 1. Injection plastic; 2. Permanent magnet; 3. Outer iron core; 4. Injection rubber; 5. First boss; 6. Second boss; 7. Inner iron core; 8. Limit rib; 9. Motor shaft.

Detailed ways

The utility model will be described in further detail below in conjunction with the accompanying drawings and specific preferred embodiments.

As shown in FIG. 1 , a permanent magnet motor rotor includes a motor shaft 9 , an inner iron core 7 and an outer iron core 3 .

The above-mentioned inner iron core 7 is in the shape of a ring, and is sleeved on the outer periphery of the motor shaft 9. The outer surface of the inner iron core 7 is evenly provided with several first bosses 5 along its circumference, preferably 4.

The above-mentioned outer iron core 3 is also in the shape of a ring, and is fitted on the outer periphery of the inner iron core 7 . The inner surface of the outer iron core 3 is evenly provided with several second bosses 6 along its circumference, preferably 4, and the positions of the first bosses 5 and the second bosses 6 are preferably corresponding to each other.

There is a gap between the inner iron core 7 and the outer iron core 3 , and the gap between the first boss 5 and the second boss 6 is the smallest, that is, the smallest gap. The above-mentioned gaps, including the smallest gaps, are filled with injection molded rubber 4 . The inner iron core 7 and the outer iron core 3 are connected and formed by injection molding rubber 4, which can effectively reduce the vibration of the rotor, make the motor run smoothly, and reduce noise. In addition, the arrangement of the first boss 5 and the second boss 6 can improve the firmness of the connection between the outer iron core 3 and the inner iron core 7 and the injection molded rubber 4, and improve the service life.

The outer surface of the outer iron core 3 is evenly provided with several limiting ribs 8 along its circumference, preferably eight. A permanent magnet 2 is engaged in two adjacent limiting ribs 8 , and there are 8 permanent magnets 2 in total.

The outer sides of each permanent magnet 2 and each limiting rib 8 are coated with injection-molded plastic 1 . The setting of the limiting rib 8 and the coating of the permanent magnet 2 by the injection molding plastic 1 make the fixing firm and beautiful, and have an insulating effect. In addition, the permanent magnet 2 and the outer iron core 3 are molded by injection molding plastic 1 at one time, so that the permanent magnet 2 can be effectively prevented from falling off due to centrifugal force during the rotation of the rotor or the permanent magnet is not firmly installed and falling off. At the same time, the production process can be simplified and convenient, and the production cost can be reduced.

In addition, the permanent magnet of the present application preferably adopts the post-magnetization process, that is, after the rotor is injection molded, the magnetic steel of the permanent magnet is magnetized before the rotor is assembled, thereby avoiding the scrapping of the permanent magnet in the production turnover link, which can effectively reduce manufacturing cost.

The preferred embodiments of the present application have been described in detail above, but the present application is not limited to the specific details in the above-mentioned embodiments. Within the scope of the technical concept of the present application, various equivalent transformations can be performed on the technical solutions of the present application. These equivalent transformations All belong to the scope of protection of this application.

Claims (5)

1. A permanent magnet motor rotor, characterized in that: comprising a motor shaft, an inner iron core that is sleeved on the outer circumference of the motor shaft, an outer iron core that is sleeved on the outer circumference of the inner iron core, the inner iron core and the outer iron core There is a gap between them, and the gap is filled with injection molded rubber; the outer surface of the outer iron core is evenly provided with several limiting ribs along its circumference, and a permanent magnet is engaged in two adjacent limiting ribs; each The outside of the permanent magnet and each limiting rib is coated with injection-molded plastic. 2. The permanent magnet motor rotor according to claim 1, characterized in that: the outer surface of the inner iron core is evenly provided with several first bosses along its circumferential direction. 3. The permanent magnet motor rotor according to claim 2, characterized in that: the inner surface of the outer iron core is uniformly provided with several second bosses along its circumferential direction. 4. The permanent magnet motor rotor according to claim 3, characterized in that: the number of the first boss and the second boss are equal, the positions of the first boss and the second boss are corresponding, and the first boss A minimum gap is set between the boss and the second boss, and the minimum gap is also filled with injection molding rubber. 5 . The permanent magnet motor rotor according to claim 1 , wherein there are eight limiting ribs and permanent magnets. 5 .