CN101345440B - Permanent magnet motor with shaft radial folding winding - Google Patents

Abstract

The utility model relates to a permanent magnet motor with axial and radial folded windings, which belongs to the field of motors. The purpose is to solve the problem that the current permanent magnet motor has a small effective utilization rate of space, and the structure of the motor is not compact, so that the torque density and power density cannot be effectively improved. The invention includes a stator, a rotor and a shaft, the stator is fixed on the shaft, the rotor is arranged outside the stator, the rotor and the shaft are connected in rotation, the stator core is circular, and the outer circular surface of the stator core is evenly distributed with a plurality of Axial slots. There are multiple radial slots radially distributed on both sides of the stator core. The axial slots correspond to the radial slots and communicate with each other. Each axial slot and its corresponding radial slot Stator windings are arranged in common with the slots, and a plurality of first permanent magnets are evenly distributed on the inner circular wall of the rotor core, and are evenly arranged around the shaft. A plurality of second permanent magnets are arranged, and the stator winding is a multi-phase symmetrical winding.

Description

Permanent Magnet Motor with Shaft-Radial Folded Windings

technical field

The invention belongs to the field of motors.

Background technique

At present, the commonly used permanent magnet motors include radial flux cylindrical permanent magnet motors and axial flux disc permanent magnet motors. They have a common problem that the effective utilization of motor space is small, and the motor structure is not compact. Effectively improve torque density and power density.

For the radial flux cylindrical permanent magnet motor, when the length of the motor is relatively small, the influence of the length of the end of the winding is relatively large. When the radius of the motor is large, the ratio of the length of the end of the winding at both ends of the motor to the total length of the motor is relatively large. It is very large, which wastes copper wire and increases copper loss; and a large part of the space between the bottom of the slot and the shaft is not used; on the other hand, the axial length of the permanent magnet of the radial flux motor generally cannot be processed too long , It will bring inconvenience to transportation and installation for a long time, and the process is more difficult when installing in sections (as we all know, two permanent magnets in the same magnetization direction will also generate a large repulsion force when the non-magnetization direction is close).

For the axial flux disc permanent magnet motor, a large part of space is reserved for the end windings at both the inner diameter and the outer diameter, which also increases the volume of the motor. Nowadays, people have taken various measures to shorten the length of the end: adopting various measures such as concentrated winding, chain winding, short-pitch winding, and improving the embedding process, but these are limited. Although there are also two disk motors with axial flux and a cylindrical outer rotor motor with radial flux, the space between the bottom of the groove and the shaft of the radial flux motor is used to make the structure compact. Some, but because it is only a combination of three independent winding motors, it has not solved the problem that the end windings of traditional motors are too long.

Contents of the invention

The purpose of the present invention is to solve the problem that the current permanent magnet motor has a small effective utilization rate of space, the structure of the motor is not compact, and the torque density and power density cannot be effectively improved, and a permanent magnet motor with axial and radial folded windings is designed. .

The invention includes a stator, a rotor and a shaft, the stator is fixed on the shaft, the rotor is arranged outside the stator, and the rotor and the shaft are connected in rotation, the stator is composed of a stator core and a stator winding, the stator core is circular, The outer circular surface of the stator core is provided with a plurality of axial slots, the center line of the opening of the axial slot is axial, and the plurality of axial slots are evenly arranged around the shaft. The opening centerlines of multiple radial slots are evenly arranged radially around the shaft, and the axial slots correspond to the radial slots on both sides of the stator core respectively, and are connected respectively. Stator windings are arranged in the slots and the end surfaces on both sides of the stator core and the corresponding radial slots. The rotor is composed of a rotor core, a first permanent magnet and a second permanent magnet. A plurality of first permanent magnets are distributed, and the plurality of first permanent magnets are evenly arranged around the shaft. A plurality of second permanent magnets are respectively arranged on the inner surfaces of the two sides of the rotor core, and the plurality of second permanent magnets surround the shaft. The shafts are evenly arranged radially, and the stator winding is a multi-phase symmetrical winding.

The advantages of the present invention are:

1. Due to the use of shaft-radial folded windings, the end windings are all near the shaft. Compared with the radial cylindrical motor, its axial length is reduced, and its radius is reduced compared with the axial flux disc motor, fully The free space at the inner diameter of the motor is utilized.

2. The structure of the motor is compact, and a higher power density and torque density of the motor can be obtained through an independent drive unit to output power.

3. It does not need a mechanical device for deceleration and transmission, and can be used in occasions that require high-torque drive, replacing the traditional mode of motor acceleration and deceleration mechanisms, and improving the overall operating efficiency of the system.

Description of drawings

Fig. 1 is a schematic structural view of the present invention, Fig. 2 is a schematic structural view of a rotor of the present invention, Fig. 3 is a sectional view of A-A of Fig. 2 , Fig. 4 is an axial sectional view of a stator, and Fig. 5 is a side view of a stator.

Detailed ways

Specific Embodiment 1: The present embodiment will be described below in conjunction with FIGS. 1 to 5. This embodiment consists of a stator, a rotor, and a shaft 6. The stator is fixed on the shaft 6. The rotor is arranged outside the stator. The stator is composed of a stator core 1 and stator winding 2, the stator core 1 is circular, and the outer surface of the stator core 1 is provided with a plurality of axial slots 1-1, the opening centerline of the axial slots 1-1 is axial, A plurality of axial slots 1-1 are evenly arranged around the shaft 6, and a plurality of radial slots 1-2 are respectively arranged on both sides of the stator core 1, and the opening centerlines of the plurality of radial slots 1-2 surround The shafts 6 are evenly arranged radially, and the axial slots 1-1 correspond to the radial slots 1-2 on both sides of the stator core 1 respectively, and are respectively connected. Each axial slot 1-1 and the stator iron core The end faces on both sides of the core 1 and the corresponding radial slots 1-2 are jointly provided with a stator winding 2. The rotor is composed of a rotor core 3, a first permanent magnet 4 and a second permanent magnet 5. The inner part of the rotor core 3 A plurality of first permanent magnets 4 are evenly distributed on the circular wall, and the plurality of first permanent magnets 4 are uniformly arranged around the shaft 6, and a plurality of second permanent magnets are respectively arranged on the inner surfaces of the two sides of the rotor core 3 5. A plurality of second permanent magnets 5 are uniformly arranged radially around the shaft 6 , and both end surfaces of the rotor core 3 are rotationally connected to the shaft 6 through a bearing 7 .

The stator winding 2 is a multi-phase symmetrical winding, and the shaft 6 is provided with an outlet hole 6-1, and the stator winding 2 is connected to an external three-phase sinusoidal AC power supply through the outlet hole 6-1.

An air gap L1 is left between the first permanent magnet 4 and the stator, and air gaps L2 and L3 are left between the second permanent magnet 5 on both end faces of the rotor core 3 and the stator respectively.

The stator core 1 and the rotor core 3 are made of soft magnetic composite material, steel with good magnetic permeability, or silicon steel sheets with low eddy current loss.

working principle:

The present invention can be regarded as taking a section of length at both axial ends of the outer rotor radial flux cylindrical motor and folding them along the direction of the outer radial axis of the circumference, so that the end windings at both axial ends of the traditional radial motor Or the end winding at the outer diameter of the traditional disc motor only exists near the shaft, which reduces the axial length and outer diameter of the motor, makes full use of the idle space at the inner diameter of the motor, and is expected to increase the output power density of the motor and torque density.

Since this shaft radial motor is evolved from a radial motor, it still outputs power through an independent drive unit. After the stator winding 2 is connected in a delta connection or a star connection, it is connected to an external three-phase sinusoidal AC power supply through the outlet hole 6-1 of the shaft 6 . When the stator winding 2 is supplied with three-phase alternating current, a rotating magnetic field with the same speed is generated in the radial air gap L1 of the motor and the axial air gaps L2 and L3 at both ends respectively, and the three together drive the rotor to rotate in the same direction and at the same speed , the iron core shell of the rotor is used as the output end of the rotating power.

Claims (2)

1. the magneto that has the shaft radial folding winding, it comprises stator, rotor and axle (6), stator is fixed on the axle (6), rotor is arranged on the outside of stator, be rotationally connected between rotor and the axle (6), it is characterized in that described stator is made up of stator core (1) and stator winding (2), stator core (1) is an annular, the outer round surface of stator core (1) is provided with a plurality of axial grooves (1-1), the open centre line of axial groove (1-1) is axial, a plurality of axial grooves (1-1) are evenly distributed round axle (6), be respectively arranged with a plurality of radial slots (1-2) on the both sides end face of stator core (1), it is evenly distributed that the open centre line of a plurality of radial slots (1-2) is the radiation wire round axle (6), axial groove (1-1) is corresponding one by one respectively with the radial slot (1-2) of stator core (1) both sides end face, and be communicated with respectively, only in each axial groove (1-1) and in stator core (1) the both sides end face radial slot (1-2) corresponding, be provided with stator winding (2) jointly with it, described rotor is by rotor core (3), first permanent magnet (4) and second permanent magnet (5) are formed, be evenly equipped with a plurality of first permanent magnets (4) on the inner round wall face of rotor core (3), a plurality of first permanent magnets (4) are evenly distributed round axle (6), be respectively arranged with a plurality of second permanent magnets (5) on the inner surface on the both sides end face of rotor core (3), it is evenly distributed that a plurality of second permanent magnets (5) are the radiation wire round axle (6), and stator winding (2) is heterogeneous symmetric winding.

2. the magneto with shaft radial folding winding according to claim 1 is characterized in that stator core (1) and rotor core (3) adopt soft-magnetic composite material material or the good steel of magnetic conductivity.

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