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Self-adaptive passive flux-weakening permanent magnet synchronous rotor

A permanent magnet synchronous motor, self-adaptive technology, applied in the direction of magnetic circuit rotating parts, magnetic circuit shape/style/structure, etc. The effect of magnetic speed regulation range, increasing speed range and reducing copper loss

Inactive Publication Date: 2012-10-03
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem of difficulties in field-weakening speed regulation of permanent magnet motors due to non-adjustable excitation in the current field-weakening speed regulation technology of permanent magnet synchronous motors, and provides an adaptive passive field-weakening permanent magnet synchronous motor rotor

Method used

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  • Self-adaptive passive flux-weakening permanent magnet synchronous rotor
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  • Self-adaptive passive flux-weakening permanent magnet synchronous rotor

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specific Embodiment approach 1

[0023] Specific implementation mode one: the following combination Figure 1 to Figure 4 Describe this embodiment, the self-adaptive passive field weakening permanent magnet synchronous motor rotor described in this embodiment includes a rotor core 1, it also includes 2n main permanent magnets 2, 2n auxiliary permanent magnets 3 and 2n springs 4, n is a positive integer,

[0024] There are 2n through slots along the axial direction of the rotor core 1, and the 2n through slots are evenly distributed along the circumferential direction of the rotor core 1, and a main permanent magnet 2 with a matching shape is embedded in each through slot,

[0025] A slide rail groove 1-1 is arranged between every two adjacent through grooves along the circumferential direction on the rotor core 1, each slide rail groove 1-1 is arranged radially, and the groove bottom of each slide rail groove 1-1 is A spring 4 is fixed, and the free end of the spring 4 is fixedly connected with an auxiliary ...

specific Embodiment approach 2

[0030] Embodiment 2: This embodiment is a further description of Embodiment 1. When the rotor core 1 runs at or below the base speed, the air-gap flux is generated by the main permanent magnet 2 and the auxiliary permanent magnet 3. And composition; when the rotor core 1 is running above the base speed, the air gap flux is composed of the magnetic flux emitted by the main permanent magnet 2 offsetting the reverse magnetic flux emitted by the auxiliary permanent magnet 3 .

specific Embodiment approach 3

[0031] Specific Embodiment 3: This embodiment is a further description of Embodiment 1 or 2. When the highest point of the auxiliary permanent magnet 3 in the radial position does not exceed the adjacent permanent magnet 2, it is the same as the magnetic pole of the adjacent main permanent magnet 2. When the highest point of the auxiliary permanent magnet 3 exceeds the adjacent permanent magnet 2 in the radial position, the magnetic pole of the adjacent main permanent magnet 2 is opposite.

[0032] The rotor core 1 is cylindrical, and the auxiliary permanent magnet 3 can move radially in the slide rail groove 1-1 under the action of the magnetic field force and the spring force. When the motor runs below the base speed, the auxiliary permanent magnet 3 When the force reaches the static balance, the radial position in the slide rail slot 1-1 taking the center of the rotor core 1 as the reference point is not higher than the main permanent magnet 2, and the magnetic pole of the a...

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Abstract

The invention discloses a self-adaptive passive flux-weakening permanent magnet synchronous rotor which belongs to the technical field of motors. The rotor solves the problem that in the flux-weakening speed regulation technology of the permanent magnet synchronous motor in the prior art, the flux-weakening speed regulation caused by unadjustable excitation in the permanent magnet motor is very difficult. Even number of grooves are arranged in the axial direction of a rotor core; the 2n grooves are uniformly distributed in the circumferential direction of the rotor core; a primary permanent magnet with the shape matched with the groove is embedded into each groove; slide grooves are arranged between every two grooves in the circumferential direction on the rotor core; each slide groove is radially arranged; a spring is fixed on the bottom of each slide groove; a free end of a spring is fixedly connected to an auxiliary permanent magnet; the bottom of the slide groove is the bottom located in the circumferential direction of the rotor core; and the sum of lengths of the secondary permanent magnet and static spring is shorter than the radial length of the slide groove. The self-adaptive passive flux-weakening permanent magnet synchronous rotor is suitable for a permanent magnet synchronous motor.

Description

technical field [0001] The invention relates to an adaptive passive weak magnetic permanent magnet synchronous motor rotor, which belongs to the technical field of motors. Background technique [0002] The excitation of the permanent magnet synchronous motor cannot be adjusted, and the field weakening control must be carried out when it runs above the base speed. In the traditional method, by increasing the negative direct-axis demagnetization current, the demagnetization effect of the armature reaction is used to weaken the air gap magnetic field of the motor, which is equivalent to directly weakening the excitation magnetic field to achieve the purpose of weakening the field speed. This method of field-weakening speed-up will increase the current of the motor and reduce the efficiency of the system, which limits the application range of the permanent magnet synchronous motor. In addition, in the permanent magnet synchronous motor, the demagnetization effect is related to ...

Claims

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Application Information

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IPC IPC(8): H02K1/27H02K1/28
Inventor 李春艳寇宝泉
Owner HEILONGJIANG UNIV