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Passive magnetic suspension brushless D.C. motor

A brushed DC motor and magnetic levitation technology, applied in the direction of magnetic circuit shape/style/structure, electrical components, electromechanical devices, etc., to achieve the effect of improving system efficiency, improving operational reliability, and simple control technology

Inactive Publication Date: 2007-02-21
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems that bearingless motors and motors with active magnetic bearings need to perform dynamic detection of rotor position and real-time control of levitation force with multiple degrees of freedom, the present invention provides a passive magnetic levitation brushless DC motor that does not require levitation force control

Method used

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  • Passive magnetic suspension brushless D.C. motor
  • Passive magnetic suspension brushless D.C. motor
  • Passive magnetic suspension brushless D.C. motor

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Embodiment Construction

[0010] As shown in the accompanying drawings, the present invention is mainly composed of two parts, a motor and a passive magnetic bearing. The motor is composed of a stator core 2 fixed on a casing 1 , a stator winding 3 , and a permanent magnet rotor 4 fixed on a rotor yoke 5 and a non-magnetic rotating shaft 8 . The stator core is made of laminated electrical steel sheets, and has a certain number of slots for placing the stator windings, and the power wires of the windings are drawn out through the holes on the housing 1 . The permanent magnet rotor 4 consists of radially magnetized permanent magnets. The passive magnetic bearing consists of two sets of permanent magnet inner rings 7 and outer rings 6 with the same geometric size and magnetic performance. The axial magnetization direction of each set of permanent magnet rings is the same, while the axial magnetization direction of the two sets of permanent magnet rings on the contrary. The inner ring of each set of perm...

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Abstract

A brushless DC motor of passive magnetic suspension, it is made up of housing cover, stator, rotor, shaft, and two passive magnetic bearing; fix the motor's stator iron core in the housing cover, plate two group of permanent magnetic exterior ring of magnetic bearing at both left and righ side, the permanent interior ring of the rotor and two passive magnetic bearing fixes at a shaft that is made of non magnetic material, the magnetic bearing adopts axial lead magnet charging, the permanent magnet of the rotor adopts radial lead magnet charging. The current invention realizes the magnetic suspension of the electric machine of which the lift force are on need to control, saves the checking of the rotor displacement and the control device for lift force, promotes operational reliability and system efficiency.

Description

technical field [0001] The invention belongs to a motor, in particular to a passive magnetic levitation brushless DC motor. Background technique [0002] Due to the absence of mechanical wear and noise, non-contact magnetic bearings are widely used in high-speed motors and special applications requiring maintenance-free bearings such as artificial heart rotary blood pumps. There are many kinds of non-contact rotating motors, the most attractive of which is the bearingless motor structure, the rotational torque and levitation force of the rotor are generated by the stator and rotor of the motor itself, without any traditional or magnetic bearings, however The complexity of torque and magnetic levitation force decoupling control technology limits the practical application of bearingless motors. Although the motor with active magnetic bearing can realize the decoupling control of electromagnetic torque and levitation force, its control technology is relatively simpler than tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K29/00H02K7/08F16C32/04H02K1/16
Inventor 王凤翔王继强孔志国宗鸣张凤阁
Owner SHENYANG POLYTECHNIC UNIV
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