CCW Brushless DC Motor 0.35A Dc Brushless Fan Motor 24v 18000RPM

Brushless DC Motor KG-3160 24V 0.35A CCW Used For Universal Fan

Performance specification

Outer dimension

Overview

Product picture

INTRODUCTION

The BLDC motor is widely used in applications including appliances, automotive, aerospace, consumer, medical, automated industrial equipment and instrumentation.

The BLDC motor is electrically commutated by power switches instead of brushes. Compared with a brushed DC motor or an induction motor, the BLDC motor has many advantages:

• Higher efficiency and reliability
• Lower acoustic noise
• Smaller and lighter
• Greater dynamic response
• Better speed versus torque characteristics
• Higher speed range
• Longer life

Stator

There are three classifications of the BLDC motor: single-phase, two-phase and three-phase.

This discussion assumes that the stator for each type has the same number of windings. The single-phase and three-phase motors are the most widely used. Figure 5 shows the simplified cross section of a single-phase and a three-phase BLDC motor. The rotor has permanent magnets to form 2 magnetic pole pairs, and surrounds the stator, which has the windings. N N S S A B Stator Rotor Permanent magnets Air gap N N S A B S C Rotor Stator Permane nt magnet Air gap (a) Single-phase (b) Three-phase—Simplified BLDC Motor Diagrams A single-phase motor has one stator winding—wound either clockwise or counter-clockwise along each arm of the stator—to produce four magnetic poles. By comparison, a threephase motor has three windings. Each phase turns on sequentially to make the rotor revolve. There are two types of stator windings: trapezoidal and sinusoidal, which refers to the shape of the back electromotive force (BEMF) signal. The shape of the BEMF is determined by different coil interconnections and the distance of the air gap. In addition to the BEMF, the phase current also follows a trapezoidal and sinusoidal shape. A sinusoidal motor produces smoother electromagnetic torque than a trapezoidal motor, though at a higher cost due to their use of extra copper windings.

A BLDC motor uses a simplified structure with trapezoidal stator windings.

Rotor A rotor consists of a shaft and a hub with permanent magnets arranged to form between two to eight pole pairs that alternate between north and south poles. Figure 6 shows cross sections of three kinds of magnets arrangements in a rotor. There are multiple magnet materials, such as ferrous mixtures and rare-earth alloys. Ferrite magnets are traditional and relatively inexpensive, though rare-earth alloy magnets are becoming increasingly popular because of their high magnetic density.