公开(公告)号：US09673743B1

公开(公告)日：2017-06-06

申请号：US15429076

申请日：2017-02-09

申请人： Limiter Power Management System (PTY) LTD.

发明人： Terrence Hugh Billson ,  Henry Du Preez ,  Shaun Trevor Fish ,  Sean Barry Melrose

IPC分类号： H02P1/24 ,  H02P23/26 ,  H02P27/08 ,  H02P25/02

CPC分类号： H02P23/26 ,  H02P23/02 ,  H02P27/08

摘要： An power management unit receives AC power and, via an AC-DC-AC converter, provides an AC motor signal to a three-phase induction motor. Sensors in the power management unit provide data to a digital signal processor (“DSP”). The data includes a current of the AC motor signal. The DSP generates a PWM carrier signal to modulate a voltage amplitude of the AC motor signal, thereby improving the operating efficiency of the motor. The motor terminal voltage is reduced until limit conditions are reached, such as reaching a motor rated efficiency or when the motor current fluctuates.