Novel rotor of brushless direct current motor

Abstract

The invention discloses a novel rotor of a brushless direct current motor. The peripheral face of the rotor is composed of an even number of eccentric arcs, the contour of the rotor is in a quincunx shape, a permanent magnet groove corresponds to each eccentric arc, a magnetism isolating bridge is arranged between every two adjacent permanent magnet grooves, and magnetic blocks are imbedded in each permanent magnet groove in sequence from N to S; the two ends of each magnetism isolating bridge are parallel, the width a of each magnetism isolating bridge is 0.3-3 mm, and the eccentric distance of each eccentric arc is 0.5-3mm; the two ends, close to an end face of the corresponding eccentric arc, of each magnetism isolating bridge are provided with oblique planes which are approximately parallel to the two ends of the corresponding eccentric arc, and the included angle c between the oblique planes on every two adjacent permanent magnet grooves ranges from 75 degrees to 160 degrees. The eccentric arcs and the permanent magnet grooves of the novel rotor are designed to be mutually matched, the air-gap magnetic field and the winding counter electromotive force wave form are improved, the magnetic field cutting inside the motor is effectively improved, and the rotation inertia moment of the rotor is decreased, so that the commutation noise and commutation vibration generated when the motor rotates are reduced, and an obvious effect for meeting the operating requirements of silence and slight vibration is achieved for the motor.

Description

technical field [0001] The invention relates to the technical field of DC brushless motors, in particular to a novel rotor of DC brushless motors. Background technique [0002] There are many kinds of motors available, which can be roughly divided into two categories: AC motors and DC motors. DC motors are further divided into brushed and brushless. AC motors have the advantages of simple structure, low cost, and low noise. Speed ​​is difficult. Although the brushed DC motor is easy to adjust the speed, it has the disadvantages of loud noise, complex structure, prone to failure, and difficult maintenance. Brushless DC motor is a representative new type of mechatronics product. The technologies involved include material technology, electronic technology, information technology and detection technology. Brushless motor is developed from micro motor. Brushless DC motor relies on its Excellent working performance has been widely used in automobiles, household appliances, aeros...

AI Technical Summary

Problems solved by technology

The main reason is that the magnetic force of the rotor is relatively strong, which makes the rotor's starting moment of inertia relatively large. When starting, it needs to apply current and torque, which increases the vibration and noise of the motor.

During operation, since the N and S poles of the magnetic force on the surface of the rotor are relatively close, the N and S poles interfere with each other significantly, resulting in obvious vibration noise of the stator commutation when the rotor rotates.

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