- 专利标题： System for operating a three-phase variable frequency drive from an unbalanced three-phase or single-phase AC source
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申请号： US14259385申请日： 2014-04-23
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公开(公告)号： US09853587B2公开(公告)日： 2017-12-26
- 发明人: Mahesh M. Swamy , Anupama Balakrishnan , Joshua David Collins
- 申请人： Yaskawa America, Inc.
- 申请人地址： US IL Waukegan
- 专利权人： Yaskawa America, Inc.
- 当前专利权人： Yaskawa America, Inc.
- 当前专利权人地址： US IL Waukegan
- 代理机构： Wood, Phillips, Katz, Clark & Mortimer
- 主分类号： H02P1/00
- IPC分类号： H02P1/00 ; H02P1/28 ; H02P3/00 ; H02P7/06 ; H02P7/14 ; H02P23/00 ; H02P25/00 ; H02P27/00 ; H02P27/04 ; H02M1/15 ; H02M5/458 ; H02M7/5387 ; B26B19/06 ; A61B17/16 ; B26B19/00 ; B26B19/38
摘要：
A variable frequency motor drive comprises a converter including a rectifier having an input for connection to an AC power source and converting the AC power to DC power. A DC bus is connected to the rectifier circuit. At least one bus capacitor is across the DC bus. An inverter receives DC power from the DC bus and converts the DC power to AC power to drive a motor. A controller is operatively connected to the converter. The controller comprises a speed control controlling the inverter responsive to a speed command to maintain a desired motor speed. A speed foldback control measures DC bus ripple voltage and regulates the speed command responsive to the measured DC bus ripple voltage.
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