Permanent magnet motor rotor

Abstract

The utility model discloses a permanent magnet motor rotor, which comprises a main shaft; two axial blocks fixedly mounted on the main shaft; a magnetic isolation ring and a magnetic steel column mounted between the two blocks on the main shaft, wherein the magnetic steel column and the magnetic isolation ring are provided with spacer blocks along the axial direction; a sheath wrapping the magnetic steel column, the magnetic isolation ring and the spacer blocks; and is characterized in that: the two blocks are provided with opposite notches, and the two ends of the spacer blocks are provided with protrusions matching the notches on the blocks.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and more specifically relates to a permanent magnet motor rotor. Background Art

[0002] Permanent magnet synchronous motor is a widely used motor. This motor has a main shaft in the center of its rotor. Two rows of blocks and two rows of magnetic isolation rings are arranged axially outside the main shaft. Several rows of magnetic steel are arranged between the two rows of magnetic isolation rings. The magnetic steel rows and magnetic isolation rings are arranged with spacer blocks axially. The magnetic steel is covered with a sheath. Generally speaking, the sheath will cover the entire circumference, that is, it will not only cover the magnetic steel, but also the spacer blocks and magnetic isolation rings.

[0003] In a permanent magnet synchronous motor, the stator coil generates a magnetic field, and the electromagnetic force between the magnetic field and the rotor magnet interacts with each other, and the rotor rotates under the impetus of the electromagnetic force of the magnet. In other words, the force on the rotor is actually transmitted in the order from the coil to the magnet to the main shaft. Traditionally, the magnet, the spacer block and the magnetic isolation ring are bonded to the main shaft with glue, and the glue can transmit part of the force. In addition, the sheath has a pre-tightening force during installation, which will press the magnetic isolation ring, the spacer block and the magnet on the main shaft. This pressing force can bring a certain friction force, and this friction force can also transmit force. The force transmitted by glue and friction is usually sufficient. However, in the case of particularly large motor torque, glue and friction are not enough. If the torque is particularly large, the glue may be torn, so that the magnet and the spacer block will slip and rotate around the main shaft, and eventually cause the motor to fail. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a permanent magnet motor rotor, and the technical solution it adopts is: a permanent magnet motor rotor, which comprises: a main shaft; two axial blocks fixedly mounted on the main shaft; a magnetic isolation ring and a magnetic steel column mounted between the two blocks on the main shaft, wherein the magnetic steel column and the magnetic isolation ring are provided with spacer blocks along the axial direction; a sheath wrapping the magnetic steel column, the magnetic isolation ring and the spacer blocks; it is characterized in that: the two blocks are provided with relative notches, and the two ends of the spacer blocks are provided with protrusions matching the notches on the blocks.

[0005] The further technical features of the utility model are:

[0006] The block and the main shaft are an integrated structure.

[0007] The number of the spacer blocks is 2N, and the number of the notches on the block is the same as the number of the protrusions at both ends of the spacer blocks.

[0008] The sleeve has a pre-tightening force when installed, and the pre-tightening force will press the spacer block, the magnetic steel array and the magnetic isolation ring onto the main shaft.

[0009] The beneficial effects of the utility model are:

[0010] Since the utility model has relative gaps on the two blocks, and the two ends of the spacer block are provided with protrusions matching the gaps on the blocks, when the magnetic steel column is subjected to electromagnetic force due to the external magnetic field, the force will act on the spacer block, and the spacer block will then transfer the force to the gaps in the blocks through the protrusions, and finally to the main shaft. The force that can be transmitted by the protrusions and the gaps is much greater than the force that can be transmitted by the glue and the friction force. In this way, when the torque of the motor is particularly large, there will be no circumferential sliding between the magnetic steel column, the spacer block, the magnetic isolation ring and the main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0012] Figure 2 yes Figure 1 A structural cross-sectional view of the embodiment shown in the AA direction;

[0013] Figure 3 yes Figure 1 A schematic diagram of the structure of the embodiment shown when the sheath is removed;

[0014] Figure 4 yes Figure 1 A schematic diagram of the structure of the spacer block in the illustrated embodiment. DETAILED DESCRIPTION

[0015] The utility model will be described in further detail below in conjunction with the accompanying drawings.

[0016] like Figures 1 to 4 As shown, a permanent magnet motor rotor comprises a main shaft 1; two axial blocks 2 fixedly mounted on the main shaft 1; a magnetic isolation ring 3 and a magnetic steel column 4 mounted between the two blocks 2 on the main shaft, wherein the magnetic steel column 4 and the magnetic isolation ring 3 are provided with a spacer block 5 along the axial direction; a sheath 6 wrapping the magnetic steel column 4, the magnetic isolation ring 3 and the spacer block 5; it is characterized in that: the two blocks 2 are provided with opposite notches 201, and the two ends of the spacer block 5 are provided with protrusions 501 matching the notches 201 on the blocks.

[0017] In this embodiment, the block 2 and the main shaft 1 are an integrated structure, and the block 2 and the main shaft 1 are more firmly connected; two spacer blocks 5 are provided, and four notches 201 are provided on the block 2, which match the four protrusions 501 at both ends of the two spacer blocks 5; the sleeve 6 has a pre-tightening force during installation, and the pre-tightening force will press the spacer block 5, the magnetic steel array 4, and the magnetic isolation ring 3 onto the main shaft.

[0018] In practical applications, the spacer blocks 5 can also be set to 4 or 6 or 8 or more even numbers, and the number of the notches 201 on the block is the same as the number of the protrusions 501 at both ends of the spacer blocks.

[0019] Since the utility model has opposite notches 201 on the two blocks 2, and protrusions 501 matching the notches 201 on the blocks are provided at both ends of the spacer block 5, when the magnetic steel array is subjected to electromagnetic force due to the external magnetic field, the force will act on the spacer block 5, and the spacer block 5 will then transfer the force to the notches 201 of the blocks through the protrusions 501, and finally to the main shaft 1. The force that can be transmitted by the protrusions 501 and the notches 201 is much greater than the force that can be transmitted by the glue and the friction force, so that when the motor torque is particularly large, there will be no circumferential sliding between the magnetic steel array 4, the spacer block 5, the magnetic isolation ring 3 and the main shaft 1.

[0020] The technical content and technical features of the utility model have been disclosed above, but it can be understood that under the spirit of the utility model, that is, the creative idea, those skilled in the art can make various changes and improvements to the above structure, including the combination of technical features disclosed or claimed separately here, and other combinations that obviously include these features. These variations and / or combinations all fall within the technical field involved in the utility model and fall within the protection scope of the claims of the utility model.

Claims

1. A permanent magnet motor rotor, comprising: Spindle; Two axial blocks fixedly mounted on the main shaft; A magnetic isolation ring and a magnetic steel array installed between two blocks on the main shaft, wherein the magnetic steel array and the magnetic isolation ring are provided with spacer blocks along the axial direction; A sheath wrapping the magnetic steel array, magnetic isolation ring and spacer block; The feature is that the two blocks are provided with opposite notches, and both ends of the spacer block are provided with protrusions matching the notches on the blocks.

2. The permanent magnet motor rotor according to claim 1, characterized in that: The block and the main shaft are an integrated structure.

3. The permanent magnet motor rotor according to claim 1 or claim 2, characterized in that: The number of the spacer blocks is 2N, and the number of the notches on the block is the same as the number of the protrusions at both ends of the spacer blocks.

4. The permanent magnet motor rotor according to claim 3, characterized in that: The sleeve has a pre-tightening force when installed, and the pre-tightening force will press the spacer block, the magnetic steel array and the magnetic isolation ring onto the main shaft.

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