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A motor rotor structure and permanent magnet synchronous motor

A technology of motor rotor and rotor iron core, applied in synchronous machine, synchronous machine parts, magnetic circuit shape/style/structure, etc., can solve the problems of limiting motor speed, deterioration of motor torque output performance, etc., to ensure torque Output capability, the effect of increasing the maximum operating speed

Active Publication Date: 2021-04-27
福州凯美翼智能设备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the basic electromagnetic relationship of the permanent magnet synchronous motor, the rotation back EMF of the motor increases with the increase of the speed. When the motor is running at high speed, the rotation back EMF is close to the power supply voltage, the current regulator is saturated, and the torque output performance of the motor deteriorates sharply, which limits the performance of the motor. The speed is further increased

Method used

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  • A motor rotor structure and permanent magnet synchronous motor
  • A motor rotor structure and permanent magnet synchronous motor
  • A motor rotor structure and permanent magnet synchronous motor

Examples

Experimental program
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Effect test

Embodiment 1

[0025] refer to figure 1 , a motor rotor structure, comprising a rotor core 1, a rotating shaft 4, the front end of the rotor core 1 is provided with a front fixed disk 2, the rear end of the rotor core 1 is provided with a rear fixed disk 3, the diameter of the rear fixed disk 3 is larger than The diameter of the front fixed disk 2, a plurality of magnetic poles 5 are evenly fixed on the circumferential surface of the rotor core 1 along its circumferential direction, and movable magnetic shielding blocks 6 are arranged between adjacent two magnetic poles 5. The shielding block 6 can move back and forth along the axial direction of the rotor. A first pull cord 8 is arranged in front of the magnetic shield block 6 along the axial direction of the rotor core 1. The first pull cord 8 is a stretchable elastic cord. The front end of the rope 8 is relatively fixed to the front fixed plate 2, the rear end of the first stay rope 8 is connected and fixed to the front of the magnetic sh...

Embodiment 2

[0036] refer to Image 6 , a permanent magnet synchronous motor, including the rotor structure in the first embodiment, and also includes a casing 23 and a stator structure, the bottom of the casing 23 is fixed with the base 1, the rotor structure is installed inside the casing 23, and the rear end of the casing 23 is set There is an accommodating portion 25 for accommodating the second fixed disk. The diameter of the accommodating portion 25 is larger than the diameter of the main body of the housing 23 . The rear portion of the accommodating portion 25 is an opening structure, and a rear end is provided behind the accommodating portion 25 The cover 26 is provided with a plurality of second threaded holes 27 on the rear end surface of the accommodating portion 25 along its circumferential direction, and the rear end cover 26 is provided with a hole position corresponding to each second threaded hole 27, and the hole The position is provided with a locking bolt 28, the locking...

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Abstract

The invention discloses a motor rotor structure and a permanent magnet synchronous motor. The invention can automatically adjust the magnetic field shielding block according to the rotating speed of the rotor, change the magnetic flux path through the position change of the magnetic field shielding block, and achieve automatic reduction of the permanent magnet as the rotating speed increases. The purpose of the magnetic flux is to increase the maximum operating speed of the motor under the premise of constant power supply voltage; for the same motor, at low speed, the effective excitation magnetic field is strong, which ensures the torque output capability at low speed; at high speed, the effective The excitation magnetic field is weakened, which improves the maximum operating speed of the permanent magnet synchronous motor, and the magnetic field shielding block of the present invention changes the excitation magnitude through its own centrifugal action, so that the rotor will not produce a deflection phenomenon.

Description

technical field [0001] The invention relates to the technical field of motors, more specifically, it relates to a motor rotor structure and a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motor is a kind of synchronous motor. Its excitation magnetic field is generated by permanent magnets, which eliminates excitation loss. It has the advantages of high power density, high efficiency and wide speed range. It is widely used in high-performance servo and motion control fields. [0003] Unlike electric excitation synchronous motors, permanent magnet synchronous motors generate excitation magnetic fields by permanent magnets, so the magnetic field strength is generally constant. According to the basic electromagnetic relationship of the permanent magnet synchronous motor, the rotation back EMF of the motor increases with the increase of the speed. When the motor is running at high speed, the rotation back EMF is close to the power ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K21/02H02K1/24H02K1/28
CPCH02K1/24H02K1/28H02K21/028
Inventor 李卓青黄振雄常俊国余佳龙
Owner 福州凯美翼智能设备制造有限公司
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