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Brushless DC electric machine in structure of short magnetic circuit

A technology of brush DC motor and short magnetic circuit, which is applied in the direction of magnetic circuit shape/style/structure, motor, magnetic circuit static parts, etc., which can solve the problems of limiting motor efficiency, large stator iron loss, and affecting current control accuracy.

Inactive Publication Date: 2007-09-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The armature of the brushless DC motor in the prior art mostly adopts the distributed winding structure and the concentrated winding structure. When using these two winding structures, there is magnetic coupling between the phases in the armature. There is a control accuracy that affects the current; on the other hand, because the magnetic flux generated by each phase winding passes through a long magnetic circuit, the stator iron loss is relatively large, which limits the further improvement of the motor efficiency

Method used

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  • Brushless DC electric machine in structure of short magnetic circuit
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  • Brushless DC electric machine in structure of short magnetic circuit

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specific Embodiment approach 1

[0005] Specific embodiment one: this specific embodiment is described in conjunction with Fig. 1, Fig. 2 and Fig. 3, and this specific embodiment is made up of stator 4, a plurality of permanent magnets 1, rotor 2, excitation winding 3; Stator 4 is a cylindrical sleeve, rotor 2 It is a cylindrical tube; a plurality of permanent magnets 1 are installed on the rotor 2 and are evenly spaced from each other with the rotation axis of the rotor 2 as the center axis. The length direction of each permanent magnet 1 is parallel to the axis of the rotor 2 and the permanent magnets The length of 1 runs through the outer surface of the cylinder of the rotor 2; the stator 4 is sleeved on the outside of the rotor 2, and an air gap 5 is left between the inner surface of the cylindrical sleeve of the stator 4 and the outer surface of the permanent magnet 1, and the stator 4 The axis line coincides with the rotation axis of the rotor 2; the inner surface of the cylindrical sleeve of the stator ...

specific Embodiment approach 2

[0006] Specific embodiment two: this specific embodiment is described in conjunction with Fig. 4 and Fig. 5, the difference between this specific embodiment and specific embodiment one is that the outer cylindrical surface of the rotor 2 is evenly opened with a plurality of deep grooves 2-1, each A permanent magnet 1 is inlaid in each deep groove 2-1, and the permanent magnet 1 adopts tangential magnetization, and the N pole and the S pole of the permanent magnet 1 are respectively connected to the two vertical wall surfaces of the deep groove 2-1; The length of the center-to-center distance L3 between each deep slot 2-1 is equal to the width L1 of the wide slot 4-2 on the stator 4.

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Abstract

Improving structure of magnetic path for brushless type DC electric machine, the invention eliminates magnetic coupling between phases in armature. The machine includes stator, multiple permanent magnets, rotor, and excitation winding. There are multiple wide slots and narrow slots opened on inner surface of column sheath of stator. Thickness of pole body between wide slot and narrow slot is same. The excitation winding is wound on root part of pole body. Located at two sides of wide slot, first excitation winding and second excitation winding are connected in series. Sheathed on the rotor, stator and rotor are coaxial, and there is air gap between them. The invention shortens magnetic path of excitation magnetic flux of winding so as to raise efficiency of machine and control precision. Said machine can be used as electromotor or generator, applicable to robot, number control machine tool and electric vehicles.

Description

Technical field: [0001] The invention relates to a brushless direct current motor, in particular to an improvement of a magnetic circuit structure of the brushless direct current motor. Background technique: [0002] The armature of the brushless DC motor in the prior art mostly adopts the distributed winding structure and the concentrated winding structure. When using these two winding structures, there is magnetic coupling between the phases in the armature. It affects the control accuracy of the current; on the other hand, the stator iron loss is relatively large because the magnetic flux generated by the energization of each phase winding passes through a long magnetic circuit, which limits the further improvement of the motor efficiency. Invention content: [0003] The object of the present invention is to design a brushless DC motor with a short magnetic circuit structure in order to solve the problems that the magnetic coupling between the phases in the armature aff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K1/16H02K1/27H02K15/02
CPCY02T10/641Y02T10/64
Inventor 寇宝泉吴红星程树康李立毅
Owner HARBIN INST OF TECH