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    • 32. 发明授权
    • Apparatus and method of decreasing speed of sensorless brush less direct current (BLDC) motor
    • 无刷直流无刷直流电机降速的装置及方法
    • US09287807B2
    • 2016-03-15
    • US14119519
    • 2012-09-28
    • Sang-Hyun Lee
    • Sang-Hyun Lee
    • H02P6/00H02P3/14H02P6/18H02P6/24
    • H02P3/14H02P6/182H02P6/24
    • Disclosed herein is an apparatus of a sensorless brush less direct current (BLDC) motor capable of rapidly driving the BLDC motor at a decreased speed. The apparatus includes: a switching unit configured to switch a direct current (DC) power depending on a plurality of pulse width modulation (PWM) signals to generate a three-phase alternating current (AC) power and apply the generated three-phase AC power to the BLDC motor to drive the BDLC motor; a plurality of voltage dividers configured to divide voltages of reverse electromotive forces generated in the BLDC motor; and a controlling unit configured to calculate a current rotation speed of the BLDC motor using output signals of the plurality of voltage dividers, generate the plurality of PWM signals depending on the calculated current rotation speed and a command rotation speed and output the plurality of PWM signals to the switching unit, divide a rotation phase angle of the BLDC motor into a speed decreasing region and a zero crossing point (ZCP) detecting region in the case of decreasing a rotation speed of the BLDC motor, decrease the rotation speed of the BLDC motor in the case in which the rotation phase angle of the BLDC motor is in the speed decreasing region, and detect ZCPs of the reverse electromotive forces in the case in which the rotation phase angle of the BLDC motor is in the ZCP detecting region. The apparatus may very rapidly decrease a speed of the BLDC motor to a required speed.
    • 本发明公开了一种能够以较低速度快速驱动BLDC电动机的无传感器刷少直流电动机(BLDC)电动机的装置。 该装置包括:开关单元,被配置为根据多个脉冲宽度调制(PWM)信号切换直流(DC)功率,以产生三相交流(AC)电力,并将产生的三相交流电 到BLDC电机驱动BDLC电机; 多个分压器,被配置为分配在所述BLDC电动机中产生的反向电动势的电压; 以及控制单元,被配置为使用所述多个分压器的输出信号来计算所述BLDC电动机的当前转速,根据所计算的当前转速和指令旋转速度产生所述多个PWM信号,并输出所述多个PWM信号 在切换单元中,在降低BLDC电动机的转速的情况下,将BLDC电动机的旋转相位角分为减速区域和过零点(ZCP)检测区域,降低BLDC电动机的转速 在BLDC电动机的旋转相位角处于减速区域的情况下,并且在BLDC电动机的旋转相位角处于ZCP检测区域的情况下,检测反向电动势的ZCP。 该装置可以非常快速地将BLDC电动机的速度降低到所需的速度。