Permanent magnet brushless electromotor with high torque and low pulsation

A permanent magnet brushless, high-torque technology, applied in the direction of electrical components, electromechanical devices, etc., can solve the problems that it is difficult to improve the air-gap flux density waveform, affect the smooth operation of the motor, and large torque fluctuations, etc., to improve output, Effects of reducing torque ripple and increasing magnetic flux density

Inactive Publication Date: 2003-05-07
苏州和鑫电气股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the armature magnetic field of the brushless motor is a non-circular jumping rotating magnetic field, and there is a large torque fluctuation (torque ripple), which affects the smooth operation of the motor
At present, small and lightweight motors, small torque fluctuations, stable operation and increased output are the main development directions, while the output torque and torque fluctuations of brushless motors are related to the air gap flux density between the motor stator and rotor (air gap flux density ) waveform, that is, the air-gap magnetic field waveform is closely related, but it is difficult to improve the air-gap magnetic density waveform by using the traditional motor design method and conventional magnetic circuit structure at home and abroad, so as to improve output and smooth operation. Therefore, the conventional design Advanced brushless motors are far from meeting the requirements for motor performance in modern industrial automation, office automation and home automation.

Method used

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  • Permanent magnet brushless electromotor with high torque and low pulsation
  • Permanent magnet brushless electromotor with high torque and low pulsation
  • Permanent magnet brushless electromotor with high torque and low pulsation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment one: if image 3 , Figure 4 As shown, a high-torque low-pulsation permanent magnet brushless motor includes a stator (1) and a rotor (2), the rotor yoke of the rotor (2) is fixed with permanent magnet poles (3), the stator (1) and the rotor (2) is provided with radial air gap (4) between; The cross-section of described rotor (2) is regular polygon, is fixed with permanent magnetic pole (3) on each side, and the width of permanent magnetic pole (3) and rotor (2) The side lengths of the sections are the same, the inner surface of the permanent magnet pole (3) is flat and combined with the rotor (2), the outer surface of the permanent magnet pole (3) is an arc surface, and the arc radius of the arc surface is larger than that of the rotor The radius of the circumscribed circle of (2) is concentric with the axis of the rotor (2).

[0019] In this embodiment, the magnetic fields of the permanent magnet poles (3) are in parallel orientation, the air gap (4) betw...

Embodiment 2

[0020] Embodiment two: if Figure 5 , Figure 6 As shown, a high-torque low-pulsation permanent magnet brushless motor includes a stator (1) and a rotor (2), the rotor yoke of the rotor (2) is fixed with permanent magnet poles (3), the stator (1) and the rotor (2) is provided with radial air gap (4) between; The cross-section of described rotor (2) is regular polygon, is fixed with permanent magnetic pole (3) on each side, and the width of permanent magnetic pole (3) and rotor (2) The side lengths of the sections are the same, the inner surface of the permanent magnet pole (3) is flat and combined with the rotor (2), the outer surface of the permanent magnet pole (3) is an arc surface, and the arc radius of the arc surface is less than Radius of the circumscribed circle of the rotor (2).

[0021] In this embodiment, the magnetic fields of the permanent magnet poles (3) are in parallel orientation, and the magnetic poles are each in a convex arc shape, and the air gap (4) bet...

Embodiment 3

[0022] Embodiment three: as Figure 7 , Figure 8 As shown, a high-torque low-pulsation permanent magnet brushless motor includes a stator (1) and a rotor (2), the rotor yoke of the rotor (2) is fixed with permanent magnet poles (3), the stator (1) and the rotor (2) is provided with a radial air gap (3); the cross section of the permanent magnet pole (3) is drum-shaped, and the cross section of the rotor (2) is a concave arc on the side length of a regular polygon , the surface combined with the permanent magnet pole (3) on the rotor (2) is a concave arc surface corresponding to the permanent magnet pole (3), and the radius of the arc surface on the outer surface of the drum pole (3) is the same as that of the rotor ( 2) The axes are concentric, and the arc surface of the inner surface is symmetrically the same as the outer surface.

[0023] In this embodiment, due to the reasonable change of the thickness of the magnetic poles in the magnetic field orientation direction, a ...

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Abstract

The motor includes the stator and the rotor. The magnetic poles of permanent magnetism are fixed on the yokes of the rotor. There is the radial air gap between the stator and the rotor. The largest thickness of the cross section in the magnetic poles of permanent magnetism is in the center and the thickness is symmetrically reduced towards two sides gradually. The invention makes the motor possess the effect of accumulating magnetism, improve the waveform of the magnetic field and reduce the change of the magnetic reluctance so as to increase the flux density between the stator and the rotor, and the production outupt as well as reduce the torque fluctuation. The invented motor features smooth and quiet operation, small scale and lightweighting.

Description

technical field [0001] The invention relates to a permanent magnet brushless motor. Background technique [0002] At present, most of the application occasions of domestic and foreign electromechanical products still use single-phase induction motors and permanent magnet brushed DC motors with poor performance. However, permanent magnet brushless motors are rapidly replacing permanent magnet brushed motors, mainly because the former has Obvious advantages: reliable operation, adopting electronic commutation, canceling mechanical commutator and brush, easy to run at high speed; simple structure, low vibration noise, convenient maintenance, and improved life; at the same time, because there is no electric spark, it is not harmful to electronic instruments It will cause radio interference; the heat source is outside the stator, and the heat caused by the loss of the stator winding and iron core is easy to dissipate, and the heat dissipation conditions are good; the rotor has pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K29/03
Inventor 胡岗林德芳
Owner 苏州和鑫电气股份有限公司
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