CN204168098U - Permanent-magnetic synchronous motor rotor - Google Patents

Abstract

The permanent magnet synchronous motor rotor includes rotor core, N-pole magnetic steel, S-pole magnetic steel, layering, fasteners and steel sleeves; the circumferential surface of the rotor core is provided with a number of arc surfaces and bosses that are alternately distributed along the circumferential direction ; The radial section of each N pole magnet is surrounded by inner arcs and outer arcs with different centers; the radial section of each S pole magnet is surrounded by inner arcs and outer arcs with different centers; An N-pole magnet and each N-pole magnet are respectively surface-attached to the arc surface of the rotor core; N-pole magnets and S-pole magnets are alternately distributed along the circumferential direction; each bead is installed on a corresponding boss , and extend to the adjacent N-pole magnets and S-pole magnets, the fasteners pass through the assembly holes of the bead and the fixing holes of the rotor core in turn to fix the bead, N-pole magnet and S-pole magnet On the rotor iron core; the steel sleeve is sleeved on the outside of the N pole magnet and the S pole magnet. The structure of the above-mentioned rotor is stable and reliable, which can prevent the thinner parts on both sides of the magnetic steel from being broken due to the large centrifugal force at high speed.

Description

Permanent Magnet Synchronous Motor Rotor

technical field

The utility model relates to a permanent magnet synchronous motor rotor.

Background technique

Due to its high power density, fast response, compact structure, high efficiency, and power factor, permanent magnet motors have been more and more widely used in the field of high-speed electric spindles.

The stator and armature structure of the permanent magnet motor and the electric excitation motor are the same, the main difference is that the rotor excitation method is different. Unlike the electric excitation motor, the permanent magnet motor is excited by a permanent magnet, and its air gap magnetic field is synthesized by the reaction of the permanent magnet and the armature.

With different rotor structures, the performance of permanent magnet motors will also be different. Existing permanent magnet motors, especially surface-mounted motors, mostly use carbon fiber or stainless steel sleeves to fasten the permanent magnets. This structural form can well protect the concentric multi-pole magnets. However, for eccentric magnets, especially when the eccentricity is large, this method is difficult to protect the magnets, that is, the existing rotor structure is not stable enough, which affects the performance of the motor.

Utility model content

Aiming at the deficiencies of the prior art, the utility model aims to provide a permanent magnet synchronous motor rotor which can solve the above technical problems.

In order to achieve the above object, the utility model adopts the following technical solutions:

A permanent magnet synchronous motor rotor, which includes a rotor core, some N pole magnets, some S pole magnets, some beading, some fasteners and a steel sleeve;

The circumferential surface of the rotor core is provided with a number of arc surfaces and bosses alternately distributed along the circumferential direction; the radial section of each N-pole magnetic steel is surrounded by inner and outer arcs with different centers; each S pole The radial section of the magnetic steel is surrounded by inner arcs and outer arcs with different centers; each N-pole magnetic steel is surface-attached to the arc surface of the rotor core; each N-pole magnetic steel is surface-attached to the rotor core On the arc surface; N-pole magnetic steel and S-pole magnetic steel are distributed alternately and spaced along the circumferential direction; each boss of the rotor core is provided with a fixed through hole; each bead is provided with an assembly through hole; each bead is installed on a corresponding On the boss, and extend to the adjacent N-pole magnetic steel and S-pole magnetic steel, the fasteners pass through the assembly through hole of the bead and the fixing through hole of the rotor core in turn to connect the bead, N-pole magnetic steel and S pole The magnetic steel is fixed on the rotor iron core; the steel sleeve is set outside the N pole magnetic steel and the S pole magnetic steel.

Preferably, the radian of the inner arc of each S pole magnetic steel is the same as the radian of the arc surface of the rotor core.

Preferably, the radian of the inner arc of each N-pole magnetic steel is the same as the radian of the arc surface of the rotor core.

Preferably, the fasteners are screws.

Preferably, both the bead and the steel sleeve are made of non-magnetic stainless steel.

Preferably, the N-pole magnets and the S-pole magnets are made of rare earth NdFeB permanent magnet materials.

The beneficial effects of the utility model are as follows:

The structure of the above-mentioned rotor is stable and reliable, which can prevent the thinner parts on both sides of the magnetic steel from being broken due to the large centrifugal force at high speed. In addition, the flux leakage between the permanent magnets is reduced, the utilization degree of the permanent magnet materials is improved, the loss of the motor is reduced, and the operating efficiency is improved.

Description of drawings

Fig. 1 is a schematic radial cross-sectional structure diagram of a preferred embodiment of the permanent magnet synchronous motor rotor of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described:

Please refer to Fig. 1, the utility model relates to a permanent magnet synchronous motor rotor, and its preferred embodiment includes a rotor core 1, a number of N pole magnets 2, a number of S pole magnets 3, a number of beading bars 4, a number of fastening Part 5 and a steel sleeve 6.

The circumferential surface of the rotor core 1 is provided with a number of arc surfaces and bosses alternately distributed along the circumferential direction.

The radial section of each N-pole magnetic steel 2 is surrounded by inner arcs and outer arcs with different centers. The radian of the inner arc of each N-pole magnet 2 is the same as that of the arc surface of the rotor core 1 , so that each N-pole magnet 2 can be more firmly attached to the arc surface of the rotor core 1 .

The radial section of each S pole magnetic steel 3 is surrounded by inner arcs and outer arcs with different centers. The radian of the inner arc of each S pole magnet 3 is the same as that of the arc surface of the rotor core 1 , so that each N pole magnet 2 can be more firmly surface-attached to the arc surface of the rotor core 1 .

N pole magnets 2 and S pole magnets 3 are alternately distributed along the circumferential direction.

Each boss of the rotor core 1 defines a fixing through hole. Each bead 4 is provided with an assembly through hole. Each bead 4 is installed on a corresponding boss, and extends to the adjacent N-pole magnetic steel 2 and S-pole magnetic steel 3, and the fasteners 5 pass through the assembly holes of the bead 4 and the rotor core 1 in turn. The fixing through holes securely fix the bead 4, the N-pole magnet 2 and the S-pole magnet 3 on the rotor core 1, so as to prevent the thinner parts on both sides of the magnet from being broken due to the large centrifugal force at high speed.

Preferably, the fastener 5 is a screw.

The steel sleeve 6 is set outside the N-pole magnet 2 and the S-pole magnet 3 to further tighten the bead 4 , the N-pole magnet 2 and the S-pole magnet 3 , so that the structure of the rotor is more stable.

For the convenience of assembly, both the bead 4 and the steel sleeve 6 are made of non-magnetic stainless steel.

The N pole magnet 2 and the S pole magnet 3 are made of rare earth NdFeB permanent magnet material, and both are magnetized in parallel.

The structure of the above-mentioned rotor is stable and reliable, which can prevent the thinner parts on both sides of the magnetic steel from being broken due to the large centrifugal force at high speed. In addition, the flux leakage between the permanent magnets is reduced, the utilization degree of the permanent magnet materials is improved, the loss of the motor is reduced, and the operating efficiency is improved.

For those skilled in the art, various other corresponding changes and modifications can be made according to the technical solutions and ideas described above, and all these changes and modifications should fall within the protection scope of the claims of the present invention .

Claims (6)

1. A permanent magnet synchronous motor rotor, characterized in that: it comprises a rotor iron core, some N pole magnets, some S pole magnets, some beading, some fasteners and a steel sleeve; The circumferential surface of the rotor core is provided with a number of arc surfaces and bosses alternately distributed along the circumferential direction; the radial section of each N-pole magnetic steel is surrounded by inner and outer arcs with different centers; each S pole The radial section of the magnetic steel is surrounded by inner arcs and outer arcs with different centers; each N-pole magnetic steel is surface-attached to the arc surface of the rotor core; each N-pole magnetic steel is surface-attached to the rotor core On the arc surface; N-pole magnets and S-pole magnets are alternately distributed along the circumferential direction; Each boss of the rotor core is provided with a fixing through hole; each bead is provided with an assembly through hole; each bead is installed on a corresponding boss and extends to the adjacent N pole magnet and S pole magnet , the fastener passes through the assembly through hole of the bead and the fixing through hole of the rotor core in order to fix the bead, N pole magnet and S pole magnet on the rotor core; the steel sleeve is sleeved on the N pole magnet and S Pole magnetic steel outside. 2 . The permanent magnet synchronous motor rotor according to claim 1 , wherein the arc of the inner arc of each S pole magnet is the same as the arc of the rotor core. 3 . 3 . The permanent magnet synchronous motor rotor according to claim 1 , wherein the arc of the inner arc of each N-pole magnet is the same as the arc of the rotor core. 4 . 4. The permanent magnet synchronous motor rotor according to claim 1, wherein the fasteners are screws. 5. The permanent magnet synchronous motor rotor according to claim 1, characterized in that: both the bead and the steel sleeve are made of non-magnetic stainless steel. 6. The permanent magnet synchronous motor rotor according to claim 1, characterized in that: the N-pole magnet and the S-pole magnet are made of rare earth NdFeB permanent magnet materials.