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Overview of Industrial Brushless DC (BLDC) Motors

Views: 110     Author: Site Editor     Publish Time: 2022-07-17      Origin: Site


SHOUXIN MOTOR

       无刷直流(BLDC)电机,也称为无换向器直流电机,电子换向电机,交流同步电机或直流伺服电机。由于其高效,长寿命,平稳的转矩传递和高速运行而越来越多地取代有刷直流电机。由于操作这些电机所需的复杂电机控制器的额外成本,过去它们的应用受到了限制。近年来控制器成本一直呈下降趋势,因此无刷直流电机的应用正在增加并且有望增长。BLDC电机虽然已成功应用于汽车,HVAC,电子,计算机,半导体和医疗行业,吸尘器行业,吹风机行业,宠物吸行业,但长期以来一直用于工业应用,例如执行器,CNC机器的进给驱动器,工业机器人,挤出机驱动器等。

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      尽管需要复杂的电机控制器,但是BLDC电机的结构简单,在低能耗,高转矩和非常宽的转速范围方面,提供了BLDC电机无法提供的一些固有优势。BLDC电机采用由内而外的配置,转子由一系列永磁体和一个固定电枢组成,转子由电子换向控制器激励,与有刷直流电机相比,BLDC电机具有更好的散热,更高的效率和更高的功率密度。

       由于没有电刷和机械换向器,其紧凑的尺寸,减轻的重量和较高的转速范围,为了提供工业伺服应用所需的位置反馈,BLDC电机具有一个编码器(光学或霍尔效应),用于测量转子的位置。编码器产生的反馈信号被电机控制器用来产生输入信号,以激励电枢电流并对其进行电子换向,从而使电枢的磁场与转子同步旋转。BLDC电机的优点包括:


由于缺少电气和摩擦损失,使用寿命更长。由于缺少电刷和机械换向器,因此几乎无需维护。由于消除了电刷产生的电离尖峰,从而降低了EMI和噪声。

 

由于它们可以完全密封,因此更适用于危险环境(污垢,油,油脂和其他异物),操作特性包括:

1)高速,短索引运动;

2)重负载,高扭矩控制;

3)短占空比运动和;

4)高加速/减速能力。


SHOUXIN MOTOR

Brushless DC (BLDC) motors, also known as commutatorless DC motors, electronically commutated motors, AC synchronous motors or DC servo motors. Brushed DC motors are increasingly being replaced due to their high efficiency, long life, smooth torque transfer and high speed operation. Their application has been limited in the past due to the additional cost of complex motor controllers required to operate these motors. Controller costs have been on a downward trend in recent years, so the application of brushless DC motors is increasing and is expected to grow. Although BLDC motors have been successfully used in the automotive, HVAC, electronics, computer, semiconductor and medical industries, vacuum cleaner industry, hair dryer industry, pet suction industry, they have long been used in industrial applications such as actuators, feed drives for CNC machines, Industrial robots, extruder drives, etc.

Despite the need for a sophisticated motor controller, the simple structure of BLDC motors offers some inherent advantages that BLDC motors cannot provide in terms of low energy consumption, high torque, and a very wide speed range. The BLDC motor adopts an inside-out configuration. The rotor consists of a series of permanent magnets and a fixed armature. The rotor is excited by an electronic commutation controller. Compared with the brushed DC motor, the BLDC motor has better heat dissipation and higher efficiency and higher power density.

Due to the absence of brushes and mechanical commutators, its compact size, reduced weight and high speed range, in order to provide the position feedback required for industrial servo applications, BLDC motors have an encoder (optical or Hall effect), Used to measure the position of the rotor. The feedback signal generated by the encoder is used by the motor controller to generate the input signal to excite and electronically commutate the armature current so that the magnetic field of the armature rotates in sync with the rotor. Advantages of BLDC motors include:


Longer life due to lack of electrical and frictional losses. Little maintenance is required due to the lack of brushes and mechanical commutators. EMI and noise are reduced due to the elimination of ionization spikes generated by the brushes.


Since they can be completely sealed, they are more suitable for use in hazardous environments (dirt, oil, grease and other foreign matter), and operating characteristics include:


(1) High speed, short index motion;

(2) Heavy load, high torque control;

(3) Short duty cycle motion sum;

(4) High acceleration/deceleration capability.