A bearingless permanent magnet synchronous motor

A permanent magnet synchronous motor, bearingless technology, applied in electric components, electromechanical devices, electrical components, etc., can solve the problems that the center of the stator and rotor cannot overlap when the bearingless motor is running, which affects the stable floating performance of the rotor.

Active Publication Date: 2021-04-16
HEBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the high-speed operation of the bearingless permanent magnet synchronous motor with the existing structure, due to interference, load and other reasons, the centers of the stator and rotor cannot coincide when the bearingless motor is running, and sometimes even touch the backup bearing, which affects the rotor. Stable suspension running performance

Method used

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  • A bearingless permanent magnet synchronous motor

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with accompanying drawing.

[0012] Such as figure 1 As shown, a bearingless permanent magnet synchronous motor, one end of the rotor shaft 1 is a suspension end 16, and an annular reference ring 2 is fixed on the rotor shaft 1 inside the motor end cover 15 of the suspension end, and the suspension end of the rotor shaft 1 is installed There are auxiliary rolling bearings 14 to prevent the rotor 6 from colliding with the stator 5 when no radial levitation force current is applied. There is a gap 4 between the auxiliary rolling bearing 14 and the rotor shaft 1. When the levitation winding 12 is supplied with current to generate a levitation force, the rotor shaft 1 is suspended from the auxiliary rolling bearing 14, and the auxiliary rolling bearing 14 stops. A position sensor 3 is installed on the motor end cover 15 on the side of the floating end 16 of the rotor shaft 1, which is radially aligned wit...

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Abstract

The invention discloses a bearingless permanent magnet synchronous motor. A cylindrical rotor is installed on the rotor shaft. The material of the rotor is a permanent magnet material. Grooves are arranged on the outer layer of the rotor, and coils are embedded in the grooves. If they are connected to form a short circuit, the coil is called a damping coil. Due to interference, load and other reasons, the centers of the stator and rotor cannot coincide when the bearingless motor is running, which affects its ability to run stably. After the damping coil is added to the rotor, when the rotor is eccentric, the magnetic flux density of the air gap magnetic field will change, and an induced current will be induced in the damping coil, which will affect the magnetic flux density of the air gap magnetic field. Under the action of the magnetic field, the electromagnetic force generated on the rotor always hinders the change trend of radial levitation force and unilateral magnetic pull force, which reduces the sensitivity of the motor to external interference and changes, and has better robustness , increase the stable suspension performance of the rotor, and improve the anti-interference ability of the motor when it is running.

Description

technical field [0001] The invention relates to a motor, in particular to a bearingless permanent magnet synchronous motor with damping. Background technique [0002] Bearingless motor, also known as self-bearing motor, is a highly mechatronic system whose concept was first proposed in the late 1980s. It integrates the magnetic circuit of the motor and the magnetic bearing (magnetic bearing), so that the two share the motor core, thereby realizing the suspension of the motor shaft. The bearingless motor has the advantages of compact structure, high critical speed, and low loss, and since the rotor and stator of the bearingless motor can operate without mechanical friction, the critical speed of the rotor is increased, and the friction power consumption is reduced. It has broad application prospects in many fields such as high-speed and ultra-high-speed motors, molecular centrifugal pumps, semiconductor production, artificial heart pumps, mechanical engineering, and flywheel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/22H02K7/08H02N15/00
CPCH02K1/22H02K7/083H02N15/00
Inventor 张少如王利军王浒川郄晨杰乔文转
Owner HEBEI NORMAL UNIV
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